JP2015025456A - Wheel loader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To place a reducer tank in a location which is easily accessible from the ground.SOLUTION: A wheel loader (1) includes: an engine (18); a selective catalytic reduction device (23); a cab (7); a ladder (12); a urea water tank (13); and an injection device (24). The selective catalytic reduction device (23) processes an exhaust gas from the engine (18). The ladder (12) is provided at the right side of the cab (7) and is used when an operator gets into/out from the cab (7). The urea water tank (13) is disposed at the rear side of the ladder (12) and stores urea water. The injection device (24) injects the urea water to the exhaust gas sent from the engine (18) to the selective catalytic reduction device (23).

Description

  The present invention relates to a wheel loader.

  A diesel engine is generally used as the engine of the wheel loader. In this diesel engine, since the combustion chamber is excessive in nitrogen, nitrogen oxides are easily generated, and the exhaust gas contains nitrogen oxides. In order to purify nitrogen oxides contained in the exhaust gas, for example, the hydraulic excavator described in Patent Document 1 includes a selective catalyst reduction device, an injection device, and a reducing agent tank. The reducing agent tank stores a reducing agent such as urea water, and the injection device injects the reducing agent into the exhaust gas upstream of the selective catalyst reduction device. Thereby, the nitrogen oxides of the exhaust gas discharged from the engine are reduced to nitrogen.

JP 2012-237232 A

  In the wheel loader, in order to purify nitrogen oxides contained in the exhaust gas, it is conceivable that a selective catalyst reduction device is mounted on the wheel loader as in the hydraulic excavator described above. For this reason, the wheel loader needs to include a reducing agent tank that stores the reducing agent. Since the reducing agent in this reducing agent tank decreases with use, it is necessary to replenish the reducing agent tank appropriately. If the reducing agent tank is placed at a position that is difficult to access from the ground, the convenience is impaired. Occurs.

  The subject of this invention is arrange | positioning a reducing agent tank in the place where it is easy to access from the ground.

  A wheel loader according to an aspect of the present invention includes an engine, a selective catalyst reduction device, a cab, a ladder, a reducing agent tank, and an injection device. The selective catalyst reduction device processes exhaust gas from the engine. The cab is provided with a driver's seat inside. The ladder is provided on the side of the cab and is used when getting on and off the cab. The reducing agent tank is disposed on the back side of the ladder and stores the reducing agent. The injection device injects the reducing agent in the reducing agent tank into the exhaust gas sent from the engine to the selective catalyst reduction device.

  According to the said structure, since a reducing agent tank is arrange | positioned on the back side of a ladder, the operator can access a reducing agent tank easily from the ground. In the wheel loader, the front vehicle body and the rear vehicle body are connected to each other so as to be swingable in the horizontal direction, and a front wheel provided in the front vehicle body is positioned in front of a ladder that is a part of the rear vehicle body. For this reason, a working space is formed between the ladder and the front wheel by swinging the front vehicle body to the side opposite to the side where the reducing agent tank is disposed with respect to the rear vehicle body. For this reason, the operation | work with respect to the reducing agent tank arrange | positioned on the back of a ladder, for example, replenishment of a reducing agent, etc. can be performed easily.

  Preferably, the injection device is arranged on the first side in the rear view, and the reducing agent tank is arranged on the back side of the ladder provided on the first side of the cab.

  According to this configuration, since the injection device and the reducing agent tank are arranged on the same side of the wheel loader, the length of the reducing agent pipe connecting the injection device and the reducing agent tank can be shortened.

  Preferably, the wheel loader further includes a diesel particulate filter device and a connecting pipe. The connecting pipe connects the diesel particulate filter device and the selective catalyst reduction device. The diesel particulate filter device, the selective catalyst reduction device, and the connecting pipe are arranged so that the longitudinal direction is in the vehicle width direction.

  According to this configuration, particulate matter such as soot contained in exhaust gas from the engine can be collected by the diesel particulate filter device.

  Preferably, the diesel particulate filter device has an exhaust gas inlet and an exhaust gas outlet. The exhaust gas introduction port introduces exhaust gas from the engine. The exhaust gas outlet leads the exhaust gas to the selective catalytic reduction device. The exhaust gas inlet is located on the second side, and the exhaust gas outlet is located on the first side.

  According to this configuration, the exhaust gas outlet and the injection device of the diesel particulate filter device are both located on the first side. For this reason, the injection device can mix the reducing agent in the exhaust gas by effectively using the length of the connecting pipe.

  Preferably, the wheel loader further includes a turbocharger disposed on the second lateral side.

  According to this configuration, the turbocharger is disposed on the second side where the exhaust gas inlet of the diesel particulate filter device is located, so that the length of the pipe connecting the turbocharger and the diesel particulate filter device is long. The length can be shortened.

  Preferably, the reducing agent tank has a replenishing port for replenishing the reducing agent, and the replenishing port is provided facing forward.

  According to this configuration, since the replenishing port faces forward, it is possible to perform a work on the reductant tank, for example, a work of replenishing the reductant tank with the reductant using the space between the ladder and the front wheel. it can.

  Preferably, the wheel loader further includes a holding member and a support frame. The holding member holds the reducing agent tank. The support frame supports the holding member to be slidable forward, and is installed on the back side of the ladder.

  According to this configuration, since the holding member that holds the reducing agent tank is supported by the support frame so as to be slidable forward, the reducing agent tank can be easily pulled forward.

  Preferably, the holding member includes a bottom plate, a rear plate extending upward from a rear end of the bottom plate, and a pair of side plates extending upward from both side ends of the bottom plate. The reducing agent tank is accommodated in a space defined by the bottom plate, the rear plate, and the pair of side plates.

  According to this configuration, since the side surface and the rear surface of the reducing agent tank are supported by the rear plate and the side plate of the holding member, the holding member can stably hold the reducing agent tank.

  Preferably, the holding member has a regulating member that regulates the forward and upward movement of the reducing agent tank.

  According to this configuration, the restricting member can prevent the reducing agent tank from unintentionally jumping forward or upward from the holding member.

  Preferably, the reducing agent is urea water. When urea water is injected into the exhaust gas at a high temperature, the urea water is hydrolyzed to obtain ammonia. This ammonia chemically reacts with nitrogen oxides, and the nitrogen oxides are reduced to nitrogen and water.

  According to the present invention, the reducing agent tank can be disposed in a place that is easily accessible from the ground.

The right view of a wheel loader. The perspective view around the urea water tank seen from the right front. Side surface sectional drawing of the urea water tank seen from the left side. The perspective view of the holding member of the state which hold | maintained the urea water tank. The left view which shows the state before the sliding of the holding member holding a urea water tank. The left view which shows the state in the middle of the sliding of the holding member holding a urea water tank. The left view which shows the state after sliding of the holding member holding a urea water tank. Side surface sectional drawing of the rear vehicle body seen from the left side. The side view of the engine compartment periphery seen from the left side. The perspective view of the exhaust gas aftertreatment device seen from the left rear. The perspective view of the injection device periphery seen from the right front. The top view of an injection apparatus periphery. The right view which shows the example of installation of urea water piping. The right view which shows the state which attached the piping cover to urea water piping.

  Embodiments of a wheel loader according to the present invention will be described below with reference to the drawings. FIG. 1 is a right side view of the wheel loader 1. In the following description, “front” and “rear” mean the front and rear of the vehicle body 3. That is, the right in FIG. 1 is “front” and the left is “rear”. In the following description, “right”, “left”, “upper”, and “lower” are based on the direction when looking forward from the cab, and “vehicle width direction” is synonymous with “left-right direction”. . The “width” means the length in the left-right direction.

  As shown in FIG. 1, the wheel loader 1 includes a work machine 2, a vehicle body 3, a front wheel 4, and a rear wheel 5. The wheel loader 1 is capable of self-propelling when the front wheel 4 and the rear wheel 5 are rotationally driven, and performs a desired work using the work machine 2.

  The work machine 2 is a mechanism driven by hydraulic oil pressurized by a hydraulic pump (not shown), and is disposed in front of the vehicle body 3. The work machine 2 includes a bucket 2a, a boom 2b, a lift cylinder 2c, and a bucket cylinder 2d. Bucket 2a is attached to the tip of boom 2b. The boom 2b is a member for lifting the bucket 2a, and is attached to the front portion of the front vehicle body 3a described later. The lift cylinder 2c drives the boom 2b with pressure oil discharged from the hydraulic pump. The bucket cylinder 2d drives the bucket 2a with pressure oil discharged from the hydraulic pump.

  The vehicle body 3 includes a front vehicle body 3a and a rear vehicle body 3b. The front vehicle body 3a and the rear vehicle body 3b are connected to each other so as to be swingable in the left-right direction. A work machine 2 and a front wheel 4 are provided on the front vehicle body 3a, and a rear wheel 5 is provided on the rear vehicle body 3b. When the front vehicle body 3a is swung with respect to the rear vehicle body 3b so that the front vehicle body 3a faces the left side, a large space is formed in front of the urea water tank 13 described later.

  The rear vehicle body 3 b includes a rear frame 6, a cab 7, a hydraulic oil tank 8, an engine chamber 9, a cooling chamber 10, and a cooling fan 11. The rear frame 6 is a frame that forms the overall shape of the rear vehicle body 3b, and supports the rear wheel 5, the cab 7, the hydraulic oil tank 8, the engine 18, the cooling unit 19, and the like.

  The cab 7 is provided with a cab inside and various operation members and operation panels. A hydraulic oil tank 8 is disposed behind the cab 7, and a plurality of hydraulic pumps (not shown) are disposed below the hydraulic oil tank 8. In the hydraulic oil tank 8, hydraulic oil for driving the work implement 2 and the like is stored, and the hydraulic oil is supplied to the work implement 2 and the like by a hydraulic pump.

  On the right side of the cab 7 (an example of the first side), a ladder 12 for getting on and off the cab 7 is provided. The ladder 12 is fixed to the rear frame 6 and extends from the lower end of the cab 7 to the vicinity of the ground. Since the ladder 12 is provided at a predetermined distance from the rear frame 6, a space is formed between the ladder 12 and the rear frame 6, that is, on the back side of the ladder 12.

  FIG. 2 is a perspective view showing the periphery of the urea water tank 13 viewed from the left front side, and FIG. 3 is a side sectional view of the urea water tank 13 viewed from the left side. As shown in FIG. 2, a urea water tank (an example of a reducing agent tank) 13 is installed in a space formed on the back side of the ladder 12. As shown in FIG. 3, the urea water tank 13 has a tank body 13a, a replenishing port 13b, a level gauge 13c, a first port 13d, and a second port 13e.

  The tank body 13a has a substantially rectangular parallelepiped shape, and urea water (an example of a reducing agent) is stored therein. On the lower surface of the tank body 13a, a projecting portion 13f having a circular shape in a plan view projecting downward is formed. The protruding portion 13f is located behind the central portion in the front-rear direction. A replenishing port 13b is provided in the upper part of the tank main body 13a, and urea water is replenished into the tank main body 13a from the replenishing port 13b. The replenishing port 13b faces the front side when the urea water tank 13 is installed on the back side of the ladder 12.

  The level gauge 13c extends downward from the upper surface of the tank body 13a in the tank body 13a, and measures the remaining amount of urea water in the tank body 13a. First and second ports 13d and 13e are formed on the upper surface of the tank body 13a. The first and second ports 13d and 13e are connected to the urea water pump 14 via pipes, respectively. The urea water pump 14 is installed above the urea water tank 13 on the back side of the ladder 12 (see FIG. 2). The urea water pump 14 discharges urea water sucked from the tank body 13a through the first port 13d to an injection device 24 to be described later through the urea water pipe 25. The urea water pump 14 returns the excess urea water into the tank main body 13a through the second port 13e.

  A cooling water return pipe 15 extends in the tank body 13a. The cooling water return pipe 15 is connected to an engine 18 and a cooling unit 19 which will be described later, and the cooling water flows inside. This cooling water is water that has absorbed heat from the engine 18 and has reached a high temperature. The cooling water return pipe 15 through which the high-temperature water flows extends in the tank body 13a, so that the urea water stored in the tank body 13a can be prevented from freezing.

  As shown in FIG. 2, the urea water tank 13 is accommodated in the support frame 17 while being held by the holding member 16. The support frame 17 is fixed to the rear frame 6 in the space behind the ladder 12. The urea water tank 13 is accommodated in the space of the support frame 17. The support frame 17 includes a rail portion 17a (see FIG. 5) and a bottom plate 17b (see FIG. 5). As will be described later, the rail portion 17a is a member for pulling the holding member 16 forward, and includes a first inclined portion 17c and a second inclined portion 17d. The bottom plate 17b supports the holding member 16 that holds the urea water tank 13 from below.

  FIG. 4 is a perspective view of the holding member 16 in a state where the urea water tank 13 is held. The holding member 16 is a member for holding the urea water tank 13. As shown in FIG. 4, the holding member 16 includes a bottom plate 16a, a rear plate 16b, a pair of side plates 16c, a first restriction bar (an example of a restriction member) 16d, and a second restriction bar (an example of a restriction member) 16e. .

  The bottom plate 16a of the holding member 16 has a rectangular shape, and an opening 16f is formed. In a state where the holding member 16 holds the urea water tank 13, the protruding portion 13f of the urea water tank 13 passes through the opening 16f of the bottom plate 16a and protrudes downward. Further, the rear plate 16b extends upward from the rear end of the bottom plate 16a, and a pair of side plates 16c extends upward from both side ends of the bottom plate 16a. The urea water tank 13 is accommodated in a space defined by the bottom plate 16a, the rear plate 16b, and the pair of side plates 16c.

  The pair of side plates 16c are held from the lower part to the upper part of the urea water tank 13 at the front part thereof. The pair of side plates 16c holds the lower part of the urea water tank 13 at the center and the rear. That is, as for each side plate 16c, the front part is extended upward rather than the center part and the rear part. The rear portion of each side plate 16c extends upward from the central portion and has the same height as the rear plate 16b. In this way, the holding member 16 does not hold the entire side surface of the urea water tank 13 with the pair of side plates 16c, but exposes the central portion of the side surface of the urea water tank 13, etc. Even when the tank 13 is expanded, the holding member 16 can be prevented from being deformed.

  Each side plate 16c of the holding member 16 has a handle 16g for the operator to pull the urea water tank 13 forward together with the holding member 16 or to return it to its original state. Each side plate 16c has a first convex portion 16h projecting sideways at the front portion and a second convex portion 16i at the rear portion. The 1st convex part 16h is located above the 2nd convex part 16i. The first and second convex portions 16 h and 16 i slide on the rail portion 17 a of the support frame 17 in the front-rear direction.

  A mounting bracket 16j extends upward from the upper ends of the front portions of the pair of side plates 16c. The first restricting bar 16d is attached to the side plate 16c via the mounting bracket 16j. The first restriction bar 16d extends in the vehicle width direction and is attached to the mounting bracket 16j using bolts and nuts at both ends. The first restriction bar 16d is located above the front portion of the urea water tank 13 in a state where the holding member 16 holds the urea water tank 13, and restricts the urea water tank 13 from moving upward. The water tank 13 is prevented from jumping upward from the holding member 16.

  A mounting bracket 16k extends forward from the center of the front portion of the pair of side plates 16c. The second restriction bar 16e is attached to the side plate 16c via the attachment metal 16k. The second restriction bar 16e extends in the vehicle width direction and is attached to the mounting bracket 16k using bolts and nuts at both ends. The second restriction bar 16e is positioned in front of the urea water tank 13 in a state where the holding member 16 holds the urea water tank 13, and restricts the urea water tank 13 from moving forward. Is prevented from jumping forward from the holding member 16.

  5 to 7 are views showing a state in which the holding member 16 holding the urea water tank 13 slides forward. 5 shows a state before sliding of the holding member 16 holding the urea water tank 13, FIG. 6 shows a state during sliding of the holding member 16 holding the urea water tank 13, and FIG. The state after sliding of the holding member 16 holding the urea water tank 13 is shown.

  As shown in FIG. 5, in the state before sliding, the first convex portion 16h of each side plate 16c of the holding member 16 is located behind the first inclined portion 17c of the rail portion 17a, and the second convex portion 16i is , Located behind the second inclined portion 17d. In this state, the protruding portion 13 f of the urea water tank 13 is fitted with the concave portion 17 e formed on the bottom plate 17 b of the support frame 17.

  When the operator holds the handle 16g and pulls the holding member 16 forward from the state shown in FIG. 5, the first convex portion 16h of the holding member 16 slides along the first inclined portion 17c of the rail portion 17a. The two convex portions 16i slide along the second inclined portion 17d. As a result, the holding member 16 not only moves forward, but also moves upward by the amount of the first and second inclined portions 17c and 17d, and the protruding portion 13f of the urea water tank 13 moves to the bottom plate 17b of the support frame 17. Get out of the recess 17e. And the holding member 16 holding the urea water tank 13 will be in the state shown in FIG.

  When the operator pulls the holding member 16 further forward from the state of FIG. 6, the first and second convex portions 16h and 16i slide forward along the rail portion 17a. When the protruding portion 13f of the urea water tank 13 reaches the front end of the bottom plate 17b of the support frame 17, as shown in FIG. 7, the contact point between the protruding portion 13f of the urea water tank 13 and the front end of the bottom plate 17b is the center. The urea water tank 13 rotates so as to fall forward. Here, when the second convex portion 16i of the holding member 16 is engaged with the tip end portion of the rail portion 17a having a U-shape, the rotation of the urea water tank 13 is stopped in the state shown in FIG. As described above, since the urea water tank 13 is drawn forward from the support frame 17 and inclined forward, maintenance of sensors such as the level gauge 13c installed on the upper surface of the urea water tank 13 is facilitated. Become. In addition, the urea water tank 13 can be easily taken out from the holding member 16. The urea water tank 13 can be taken out from the holding member 16 after the first and second regulating bars 16d and 16e are removed.

  FIG. 8 is a side sectional view of the rear vehicle body 3b as viewed from the left side. As shown in FIG. 8, the engine room 9 is disposed behind the hydraulic oil tank 8. The engine chamber 9 has both side surfaces and an upper surface defined by a vehicle body cover 40 (see FIG. 1), and a rear surface defined by a partition wall 9a. The vehicle body cover 40 is attached to the rear frame 6. The vehicle body cover 40 is divided into a plurality of parts to facilitate access to the inside of the rear vehicle body 3b (the engine chamber 9 and the cooling chamber 10), and can be opened and closed independently for each part.

  Specifically, as shown in FIG. 1, the vehicle body cover 40 mainly includes an upper cover 41, a lower cover 42, and a top plate 43. The upper cover 41 is a member that covers the upper part of the side surface of the rear vehicle body 3b. The upper cover 41 is fixed to the rear frame 6 via a hinge at the front end of the engine compartment 9, that is, at the boundary between the engine compartment 9 and the hydraulic oil tank 8. The upper cover 41 can be opened and closed horizontally around this hinge. The lower cover 42 is a member that covers the lower part of the side surface of the rear vehicle body 3b. The lower cover 42 is fixed to the rear frame 6 via a hinge at an end portion on the upper cover 41 side, and can be opened and closed in the vertical direction around the hinge. The top plate 43 is a member that covers the upper surface of the rear vehicle body 3b.

  As shown in FIG. 8, a cooling chamber 10 is disposed behind the engine chamber 9, and various cooling units 19 are accommodated in the cooling chamber 10. The cooling unit 19 is a unit for lowering the temperature of the liquid or gas flowing inside the cooling unit 19, and examples thereof include a condenser and a radiator. The cooling chamber 10 is defined by a partition wall 9 a on the front surface, a body cover 40 on both side surfaces and an upper surface, and a grill 44 on the rear surface. When the cooling fan 11 is driven to rotate, the air in the cooling chamber 10 is exhausted to the outside outside through the opening of the grill 44.

  As shown in FIG. 8, the engine room 9 houses the engine 18, the exhaust gas aftertreatment device 20, and the like. The engine compartment 9 also houses a belt 18a for transmitting the rotational force of the engine 18 to the auxiliary machinery. The engine 18 is a so-called vertical engine that is disposed in the lower part of the engine compartment 9 and has a crankshaft extending in the front-rear direction.

  FIG. 9 is a side view of the periphery of the engine compartment 9 as viewed from the left side. For convenience of explanation, the description of the vehicle body cover 40 is omitted in FIG. As shown in FIG. 9, an air cleaner 18 b is disposed on the left side of the hydraulic oil tank 8. The air cleaner 18 b removes foreign substances from the air sent to the engine 18.

  The turbocharger 18c is connected to the air cleaner 18b via a flexible intake pipe 18d. The turbocharger 18c rotates the turbine with the exhaust gas from the engine 18, compresses the air from the air cleaner 18b, and pushes it into the engine 18. The turbocharger 18c is arranged at the left end (an example of the second side) in the engine compartment 9. Specifically, the turbocharger 18 c is installed on the left side of the engine 18 in the engine room 9.

  The exhaust gas aftertreatment device 20 accommodated in the engine chamber 9 is disposed in the upper portion of the engine chamber 9. That is, the exhaust gas aftertreatment device 20 is disposed above the engine 18. FIG. 10 is a perspective view of the exhaust gas aftertreatment device 20 as viewed from the left rear. As shown in FIG. 10, the exhaust gas aftertreatment device 20 includes a diesel particulate filter device 21, a connecting pipe 22, and a selective catalyst reduction device 23 in the order in which the exhaust gas flows. An injection device 24 is attached to the connection pipe 22.

  The diesel particulate filter device 21 is a device that is connected to the engine 18 via a pipe 18 e and processes exhaust gas discharged from the engine 18. Specifically, the diesel particulate filter device 21 is a device that collects particulate matter such as soot in the exhaust gas discharged from the engine 18 with a filter. The diesel particulate filter device 21 has an exhaust gas inlet 21a and an exhaust gas outlet 21b. The diesel particulate filter device 21 takes in the exhaust gas from the engine 18 through the exhaust gas inlet 21a. The diesel particulate filter device 21 discharges the treated exhaust gas from the diesel particulate collection filter device 21 via the exhaust gas outlet 21b. The diesel particulate filter device 21 incinerates the collected particulate matter with a heater attached to the filter.

  The connection pipe 22 is a pipe that connects the diesel particulate filter device 21 and the selective catalyst reduction device 23. The connection pipe 22 is formed in an S shape as a whole and includes a first bent portion 22a, a straight portion 22b, and a second bent portion 22c. The first bent portion 22 a is connected to the exhaust gas outlet 21 b of the diesel particulate filter device 21, and the second bent portion 22 c is connected to the exhaust gas inlet 23 a of the selective catalyst reduction device 23. The straight portion 22b extends between the first bent portion 22a and the second bent portion 22c.

  An injection device 24 is attached to the first bent portion 22a. The injection device 24 is arranged at the right end (an example of the first side) in the engine compartment 9. The injection device 24 injects urea water sucked up by the urea water pump 14 from the urea water tank 13 and sent through the urea water pipe 25 into the connection pipe 22 and adds urea water as a reducing agent into the exhaust gas. Device. The added urea water is hydrolyzed by the heat of the exhaust gas to become ammonia, and the ammonia is supplied to the selective catalytic reduction device 23 through the connection pipe 22 together with the exhaust gas.

  The selective catalyst reduction device 23 is a device that reduces and purifies nitrogen oxides in exhaust gas by using ammonia from the injection device 24 as a reducing agent.

  The diesel particulate filter device 21, the connecting pipe 22, and the selective catalyst reduction device 23 are each arranged in parallel. Specifically, the diesel particulate filter device 21 and the selective catalyst reduction device 23 are both substantially cylindrical. The direction in which the central axes of the diesel particulate collection filter device 21 and the selective catalyst reduction device 23 extend is the longitudinal direction of the diesel particulate collection filter device 21 and the selective catalyst reduction device 23. These devices are arranged such that the longitudinal direction thereof faces the left-right direction. For this reason, in the diesel particulate filter device 21, the exhaust gas inlet 21 a is located on the left side in the engine chamber 9 (an example of the second side). Further, the exhaust gas outlet 21 b of the diesel particulate filter device 21 is located on the right side (an example of the first side) in the engine chamber 9.

  The straight portion 22b of the connecting pipe 22 is also substantially cylindrical. The direction in which the central axis of the straight portion 22b extends is the longitudinal direction of the connecting pipe 22. The connecting pipe 22 is arranged so that the longitudinal direction is in the left-right direction.

  FIG. 11 is a perspective view showing the periphery of the injection device 24 as viewed from the right front, and FIG. 12 is a plan view showing the periphery of the injection device 24. As shown in FIGS. 11 and 12, the first partition plate 31 is disposed between the selective catalyst reduction device 23 and the vehicle body cover 40. Specifically, the first partition plate 31 is disposed between the selective catalyst reduction device 23 and the upper cover 41. A second partition plate 32 is disposed between the diesel particulate filter device 21 and the vehicle body cover 40. Specifically, the second partition plate 32 is disposed between the diesel particulate filter device 21 and the upper cover 41. The first partition plate 31 and the second partition plate 32 are arranged side by side in the front-rear direction. The first partition plate 31 is located in front of the second partition plate 32. The partition plate is divided into two parts, a first partition plate 31 and a second partition plate 32, and the first partition plate 31 and the second partition plate 32 are arranged with an interval therebetween, so that piping or the like is passed through this gap. be able to.

  The first partition plate 31 has a base portion (first partition portion) 31a and a peripheral wall portion 31b, and is fixed to the rear frame 6 using a mounting bracket 6a. The 1st partition plate 31 has heat insulation, for example, is formed with the steel plate which gave the heat-resistant coating. The base portion 31a of the first partition plate 31 is a plate shape extending in the front-rear direction from the front end portion of the engine chamber 9 to the vicinity of the injection device 24, and is formed in a substantially rectangular shape. The rear end portion of the base portion 31a is cut into a fan shape so that the right side surface of the injection device 24 is exposed when the vehicle body cover 40 is removed. That is, the base portion 31 a does not extend to the side of the injection device 24. Further, the base portion 31 a is disposed between the selective catalyst reduction device 23 and the vehicle body cover 40. As a result, radiant heat from the selective catalyst reduction device 23 to the vehicle body cover 40 can be blocked, and as a result, paint damage to the vehicle body cover 40 can also be prevented.

  The peripheral wall portion 31 b of the first partition plate 31 extends from the rear edge of the base portion 31 a toward the left side and covers the injection device 24 from the front to the top so as to face the injection device 24. That is, the peripheral wall portion 31 b is a second partition portion 31 b 1 that is a portion disposed between the injection device 24 and the selective catalyst reduction device 23, and a portion that is disposed between the injection device 24 and the top plate 43. And a third partition part 31b2. The peripheral wall portion 31 b extends from the base portion 31 a to the vicinity of the right side surface of the connection pipe 22. Further, the peripheral wall portion 31 b extends substantially along the outline of the right side surface of the connection pipe 22. Thereby, the left side, the front, and the upper side of the injection device 24 can be covered with the peripheral wall portion 31 b and the right side surface of the connection pipe 22.

  The 2nd partition plate 32 has heat insulation, for example, is formed with the steel plate which gave the heat-resistant coating. The second partition plate 32 has a base portion 32a and a peripheral wall portion 32b, and is fixed to the inner side surface of the upper cover 41 using a bolt or the like. When the upper cover 41 is opened, the second partition plate 32 is also removed together, so that the maintenance of the injection device 24 and the like is facilitated.

  The base portion 32a of the second partition plate 32 is a plate shape extending in the front-rear direction from the vicinity of the injection device 24 to the rear end portion of the engine chamber 9, and is formed in a rectangular shape. Note that the front end of the base portion 32 a is located behind the injection device 24. The base portion 32 a is disposed between the diesel particulate filter device 13 a and the vehicle body cover 40. As a result, radiant heat from the diesel particulate filter device 13a to the vehicle body cover 40 can be blocked, and as a result, paint damage to the vehicle body cover 40 can be prevented.

  The peripheral wall portion 32 b of the second partition plate 32 extends from the front edge of the base portion 32 a toward the left side and covers the rear of the injection device 24 so as to face the injection device 24. That is, the peripheral wall portion 32b is a fourth partition portion that is disposed between the injection device 24 and the diesel particulate filter device 13a. The peripheral wall portion 32 b extends from the base portion 32 a to the vicinity of the right side surface of the connection pipe 22. As described above, the injection device 24 is disposed in the accommodation space S defined by the peripheral wall portion 31 b of the first partition plate 31, the peripheral wall portion 32 b of the second partition plate 32, the vehicle body cover 40, and the connection pipe 22. .

  FIG. 13 is a right side view showing an installation example of the urea water pipe 25, and FIG. 14 is a right side view showing a state in which a pipe cover is attached to the urea water pipe 25. As shown in FIG. 13, the urea water pipe 25 is connected to the injection device 24 at the first end portion 25a (see FIGS. 11 and 12), and is connected to the urea water pump 14 at the second end portion 25b. The urea water pipe 25 is a pipe for sending urea water sucked from the urea water tank 13 by the urea water pump 14 to the injection device 24.

  The urea water pipe 25 extends downward from the urea water pump 14 to the vicinity of the urea water tank 13, extends in the horizontal direction above the urea water tank 13, and once falls below the urea water tank 13. The urea water pipe 25 extends upward along the outer surface of the frame 6 and the vehicle body cover 40 and is drawn into the engine chamber 9 from the front end of the upper cover 41 of the vehicle body cover 40. Specifically, the upper cover 41 has a bulging portion 41a that bulges outward at the front end portion. The bulging portion 41 a extends in the front-rear direction, and has a pipe inlet 41 b for drawing the urea water pipe 25 into the engine chamber 9 at the front end. The pipe inlet 41b is designed to have a size that prevents the upper cover 41 from interfering with the urea water pipe 25 when the upper cover 41 is opened. As shown in FIG. 14, the urea water pipe 25 is protected from being exposed to the outside by a plurality of pipe covers 27 in a normal state.

  As shown in FIGS. 11 and 12, the urea water pipe 25 extends between the base portion 31 a of the first partition plate 31 and the vehicle body cover 40 in the engine chamber 9. As a result, radiant heat from the selective catalyst reduction device 23 to the urea water pipe 25 can be blocked, and the urea water flowing through the urea water pipe 25 can be prevented from being heated and changed to ammonia. Further, the peripheral wall portion 31 b of the first partition plate 31 is disposed between the first end portion 25 a of the urea water pipe 25 and the selective catalyst reduction device 23. Therefore, the radiant heat from the selective catalyst reduction device 23 to the urea water pipe 25 can also be blocked by the peripheral wall portion 31b.

  The urea water pipe 25 is supported in the engine chamber 9 by a plurality of mounting brackets 6b. The urea water pipe 25 is supported by the mounting bracket 6b, thereby maintaining a state in which a predetermined distance from the first partition plate 31 is maintained. Each mounting bracket 6 b extends upward from the rear frame 6 and is inclined in a direction away from the first partition plate 31. The mounting brackets 6b are arranged at a predetermined distance from each other in the front-rear direction.

  As shown in FIG. 13, the relay member 26 is installed on the right side of the hydraulic oil tank 8. The relay member 26 is a member for connecting the pipes. The urea water pipe 25 that connects the injection device 24 and the urea water pump 14 includes two pipes, a first pipe 25c and a second pipe 25d. The first pipe 25c and the second pipe 25d are connected by a relay member 26 so as to be able to communicate with each other. The first pipe 25 c connects the relay member 26 and the injection device 24. The second pipe 25d connects the relay member 26 and the urea water pump 14.

The 1st and 2nd piping 25c, 25d has a heating wire so that the urea water which flows through the inside may not freeze. The heating wire of the first pipe 25c and the heating wire of the second pipe 25d are controlled independently of each other. That is, only the heating wire of the first piping 25c can be heated, only the heating wire of the second piping 25d can be heated, or the heating wires of both the first and second piping 25c, 25d can be heated. .
[Feature]
The wheel loader 1 according to the present embodiment has the following characteristics.

  (1) Since the urea water tank 13 is disposed on the back side of the ladder 12, the operator can easily access the urea water tank 13 from the ground. In the wheel loader 1, the front vehicle body 3 a and the rear vehicle body 3 b are connected to each other so as to be able to swing in the horizontal direction, and the front wheel 4 is located in front of the ladder 12. Therefore, a working space is formed between the ladder 12 and the front wheel 4 by swinging the front vehicle body 3a to the left side with respect to the rear vehicle body 3b, that is, the side opposite to the side where the urea water tank 13 is disposed. The For this reason, the operation | work with respect to the urea water tank 13 arrange | positioned on the back of the ladder 12, for example, replenishment of urea water, etc. can be performed easily.

  (2) Since both the injection device 24 and the urea water tank 13 are disposed on the right side of the wheel loader 1, the length of the urea water pipe 25 connecting the injection device 24 and the urea water tank 13 is shortened. Can do.

  (3) The exhaust gas outlet 21 b of the diesel particulate filter device 21 and the injection device 24 are both located on the right side of the wheel loader 1. For this reason, the injection device 24 can effectively mix the length of the connecting pipe 22 to mix urea water in the exhaust gas.

  (4) The turbocharger 18c and the diesel particulate filter device 21 are connected by the turbocharger 18c and the exhaust gas inlet 21a of the diesel particulate filter device 21 both being located on the left side of the wheel loader 1. The length of the pipe 18e can be shortened.

  (5) Since the replenishing port 13b of the urea water tank 13 faces forward, the space between the ladder 12 and the front wheel 4 is used to work on the urea water tank 13, for example, the urea water tank 13 is replenished with urea water. Work can be done.

  (6) Since the holding member 16 that holds the urea water tank 13 is slidably supported forward by the support frame 17, the urea water tank 13 can be easily pulled forward.

  (7) Since the side surface and the rear surface of the urea water tank 13 are supported by the rear plate 16b and the pair of side plates 16c of the holding member 16, the holding member 16 can stably hold the urea water tank 13.

(8) The first regulating bar 16d can prevent the urea water tank 13 from unintentionally jumping upward from the holding member 16. Further, the second restriction bar 16e can prevent the urea water tank 13 from unintentionally jumping forward from the holding member 16.
[Modification]

As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention.
Modification 1

In the above embodiment, the urea water tank 13 is installed on the back side of the ladder 12 that extends downward from the right side of the cab 7, but is not particularly limited thereto, and is installed on the back side of the ladder that extends downward from the left side of the cab 7. May be.
Modification 2

In the above embodiment, the urea water tank 13 is supported by the support frame 17 via the holding member 16. However, the invention is not particularly limited to this, and the support frame 17 directly supports the urea water tank 13 without the holding member 16. May be.
Modification 3

  In the above embodiment, urea water is used as the reducing agent, but the invention is not particularly limited thereto, and other reducing agents may be used.

DESCRIPTION OF SYMBOLS 1 Wheel loader 7 Cab 12 Ladder 13 Urea water tank 13b Replenishment port 16 Holding member 16b Rear plate 16c Side plate 16d 1st control bar (control member)
16e Second restriction bar (regulation member)
17 Support frame 18 Engine 18c Turbocharger 21 Diesel particulate collection filter device 21a Exhaust gas inlet 21b Exhaust gas outlet 22 Connection pipe 23 Selective catalyst reduction device 24 Injection device

Claims (15)

Bucket and
A boom to which the bucket is attached at one end;
A front vehicle body having left and right front wheels, the other end of the boom being attached to the front,
A rear vehicle body having rear wheels on the left and right sides and connected to the front vehicle body so as to be swingable in the left-right direction;
A rear frame provided on the rear vehicle body;
An engine supported by the rear frame;
A selective catalytic reduction device for treating exhaust gas from the engine;
A cab supported by the rear frame and provided with a driver's seat inside;
Ladder provided on the side of the cab, for getting on and off the cab,
A reducing agent tank that has a port through which urea water flows on the upper surface, is disposed on the back side of the ladder, and stores a reducing agent;
An injection device for injecting a reducing agent in the reducing agent tank to exhaust gas sent from the engine to the selective catalyst reduction device;
With
The reducing agent tank is configured to be pulled forward.
Wheel loader. The reducing agent tank has a replenishing port for replenishing the reducing agent at the top,
The wheel loader according to claim 1. The replenishing port is provided facing forward.
The wheel loader according to claim 2. The reducing agent tank further includes a level gauge extending downward from the upper surface.
The wheel loader according to any one of claims 1 to 3. The reducing agent tank further has a cooling water return pipe extending downward from the upper surface,
The wheel loader according to any one of claims 1 to 4. The injection device is disposed on the first side in a rear view,
The wheel loader according to any one of claims 1 to 5, wherein the reducing agent tank is arranged on a back side of the ladder provided on the first side of the cab. A diesel particulate filter device, and a connecting pipe for connecting the diesel particulate filter device and the selective catalyst reduction device,
The wheel loader according to claim 6, wherein the diesel particulate filter device, the selective catalyst reduction device, and the connection pipe are arranged so that a longitudinal direction thereof faces a vehicle width direction. The diesel particulate filter device has an exhaust gas inlet for introducing exhaust gas from the engine, and an exhaust gas outlet for deriving exhaust gas to the selective catalytic reduction device,
The exhaust gas inlet is located on a second side opposite to the first side in a rear view;
The wheel loader according to claim 7, wherein the exhaust gas outlet is located on the first lateral side.   The wheel loader according to claim 8, further comprising a turbocharger disposed on the second lateral side. A holding member for holding the reducing agent tank;
A support frame that slidably supports the holding member forward and is installed on the back side of the ladder;
The wheel loader according to claim 1, further comprising: The holding member has a bottom plate, a rear plate extending upward from a rear end of the bottom plate, and a pair of side plates extending upward from both side ends of the bottom plate,
The wheel loader according to claim 10, wherein the reducing agent tank is housed in a space defined by the bottom plate, the rear plate, and the pair of side plates.   The wheel loader according to claim 11, wherein the holding member includes a regulating member that regulates forward and upward movement of the reducing agent tank.   The wheel loader according to any one of claims 1 to 12, wherein the reducing agent is urea water.   The wheel loader according to any one of claims 1 to 13, further comprising a reducing agent pump installed on the back side of the ladder and above the reducing agent tank.   The wheel loader according to any one of claims 1 to 14, wherein the replenishing port is located in a central portion of the ladder in the vertical direction.

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