JP6374297B2 - Exhaust gas purification device for rolling machine - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an exhaust gas purification device for a rolling compaction machine, and more particularly to an exhaust purification device equipped with a post-treatment device that collects particulate matter in exhaust gas from an engine mounted on the rolling pressure machine as a driving power source. .

  This type of compaction machine, for example, Macadam Roller, is equipped with an HST (Hydro Static Transmission) powered by an engine in the front car body to drive the front and rear compaction wheels that also serve as running wheels. It is configured. For example, as described in Patent Document 1, the front roller wheels of the Macadam roller are arranged on the left and right sides of the front vehicle body, and the front roller wheels and the left and right side walls of the front vehicle body The hydraulic oil tank which stores the hydraulic fluid of HST is arrange | positioned at the one using the corner part between, and the fuel tank is arrange | positioned at the other.

  By the way, as a countermeasure against particulate matter contained in exhaust gas of a diesel engine, it is required to equip an exhaust system of the engine with an aftertreatment device for collecting particulate matter. This type of post-treatment device prevents particulate matter in the exhaust gas from being discharged into the atmosphere by collecting the particulate matter on the post-treatment device. Clogged. Therefore, a regeneration process for burning the particulate matter on the post-processing apparatus is periodically performed before the particulate matter collection limit is exceeded in trucks and hydraulic excavators.

  In order to burn particulate matter, it is necessary to raise the temperature of the aftertreatment device. For this reason, a technique for increasing the engine load and increasing the temperature of the aftertreatment device by increasing the exhaust temperature has been implemented.

JP 2012-158892 A

  In order to implement the method for increasing the engine load as described above, it is necessary to dispose an additional device for applying a load that generates a load on the hydraulic circuit at any location in the front vehicle body.

  However, there is no room for installing additional equipment for loading in the front body of the Macadam roller, and if additional equipment for loading is installed at a position away from the hydraulic pump or hydraulic oil tank. Another problem is that long hydraulic piping is required and the pipe resistance increases. For this reason, a drastic solution has been conventionally demanded.

  The present invention has been made to solve such problems, and the object of the present invention is to load a position near a hydraulic pump or hydraulic oil tank without affecting the installation layout of peripheral equipment. An additional object of the present invention is to provide an exhaust purification device for a compaction machine that can reduce the length of hydraulic piping by installing additional equipment.

In order to achieve the above object, an exhaust gas purification apparatus for a compaction machine according to the present invention directly connects a main pump to the rear side of an engine mounted in a vehicle body, and supplies hydraulic oil discharged from the main pump by driving the engine. A hydraulic traveling device that drives the rolling wheels provided on the left and right sides of the vehicle body by supplying to the traveling hydraulic motor to travel the vehicle, and particulates that are provided on the exhaust pipe of the engine and contained in the exhaust gas of the engine A post-processing device for collecting substances, a fuel tank disposed at a corner formed between one of the right and left rolling wheels and the side wall of the vehicle body, the other rolling wheel and the side wall of the vehicle body, During the regeneration process in which the hydraulic oil tank disposed in the corner formed between the auxiliary pump directly connected to the engine together with the main pump, and the particulate matter collected in the aftertreatment device is incinerated. Increase the discharge pressure of the auxiliary pump And a discharge pressure raising means for increasing the load on the engine, the casing is disposed in a corner portion formed between the other rolling圧輪and the vehicle body side wall, the casing is divided into two vertically by a partition wall, One of the defined upper and lower chambers is a hydraulic oil tank, and the other chamber is a valve chamber and is provided with discharge pressure increasing means .

  According to the exhaust gas purification apparatus for a rolling machine of the present invention, the fuel tank and the hydraulic oil tank are disposed at the corners formed as dead spaces between the left and right rolling wheels and the side wall of the vehicle body. Because the hydraulic oil tank has a small capacity compared to the fuel tank, a dead space remains above or below the hydraulic oil tank, and by disposing discharge pressure increasing means in this space, The discharge pressure raising means can be installed without affecting the installation layout of the equipment. According to this layout, the hydraulic oil tank and the discharge pressure raising means are close to each other, and the hydraulic oil tank and the discharge pressure raising means are located on the side of the auxiliary pump in the vehicle body. The tank and the discharge pressure increasing means are arranged at positions close to the front-rear direction, and the length of the hydraulic piping connecting these members can be shortened.

It is a side view which shows the Macadam roller of an embodiment. It is the perspective view which looked at the front body from diagonally left rear. It is the perspective view which saw through the hydraulic oil tank and the valve | bulb chamber, seeing a front part vehicle body from diagonally left back. It is the rear view which looked at the front body from the back. It is a hydraulic circuit diagram of a Macadam roller.

Hereinafter, an embodiment in which the present invention is embodied in a Macadam roller exhaust purification device will be described.
FIG. 1 is a side view showing the Macadam roller of this embodiment. In the following description, the front-rear direction and the left-right direction are expressed with reference to the vehicle.

  The vehicle body of the Macadam roller 1 (hereinafter also referred to as a vehicle) is composed of a front vehicle body 4 having a front roller wheel 2 and a rear vehicle body 5 having a rear roller wheel 3. The front vehicle body 4 and the rear vehicle body 5 are connected to each other through an articulating mechanism 6, and the front and the center of the articulating mechanism 6 are driven by driving a steering cylinder (not shown) provided in the front vehicle body 4. The vehicle 1 turns as the rear vehicle bodies 4 and 5 bend in the horizontal direction.

  The front rolling wheel 2 is composed of a pair of metal drums and is rotatably supported on the left and right of the front vehicle body 4. The rear rolling wheel 3 is composed of a single metal drum, and is rotatably supported by support arms 5 a provided on the left and right sides of the rear vehicle body 5. The front rolling wheel 2 is driven by a built-in traveling hydraulic motor 7, and the rear rolling wheel 3 is driven by a built-in traveling hydraulic motor 8, whereby the vehicle 1 travels.

  An operation console 11 having a steering 10 is installed on the front vehicle body 4, and a driver's seat 12 is installed on the rear side of the operation console 11 corresponding to the steering 10. Although not shown in the drawing, a pair of left and right steering wheels 10 and a driver's seat 12 are provided so that the operator can easily visually recognize the right and left rolling during the compacting operation. An operator who rides on the Macadam roller 1 and sits on one of the driver's seats 12 operates the steering 10 and the forward / reverse lever 13 of the operation table 11, a brake pedal (not shown) under the foot, etc. Driving and steering are performed.

  A water storage tank 15 for storing water is installed on the rear vehicle body 5. The water storage tank 15 is connected to a pressure roller sprinkling nozzle (not shown) disposed near the front and rear pressure wheels 2 and 3 via a pipe and a water pump. At the time of compaction work, water in the water storage tank 15 is supplied to each watering nozzle by a watering pump in order to prevent the pavement material from adhering to the front and rear pressure wheels 2, 3. , 3 is sprinkled.

FIG. 2 is a perspective view of the front vehicle body 4 as viewed from the left diagonally rear, FIG. 3 is a perspective view of the front vehicle body 4 as viewed from the diagonally left rear, and sees through the hydraulic oil tank and the valve chamber, and FIG. It is the rear view which looked at 4 from back.
The front vehicle body 4 is composed of a front wall 4a, left and right side walls 4b and 4c, and a rear wall, the upper surface of which is closed by an engine hood 17 (shown in FIG. 1) and a floor plate (not shown), and the lower surface is opened. The engine room 18 is defined. 2 to 4, the engine hood 17, the floor board, and the rear wall are omitted in order to clarify the internal configuration of the front vehicle body 4.

An engine 19 is mounted in the engine room 18 and supported by an engine mount (not shown). In the upper position on the rear side of the engine 19, an aftertreatment device 20 having a particulate matter collecting function and a sound deadening function is disposed. Exhaust pipes 21 and 22 (shown in FIG. 5) are connected to both sides of the aftertreatment device 20, one exhaust pipe 21 is connected to the engine 19, and the other exhaust pipe 22 is extended downward so that the front vehicle body It faces the outside from the lower part of 4.
During operation of the engine 19, the exhaust gas is guided to the post-processing device 20 through one exhaust pipe 21, and after collecting particulate matter in the post-processing device 20, the front vehicle body 4 passes through the other exhaust pipe 22. Is discharged outside.

  An HST main pump 23 is directly connected to an output shaft (not shown) below the after-treatment device 20 on the rear side of the engine 19 so that the main pump 23 is driven by the engine 19. Further, an auxiliary pump 24 (discharge pressure increasing means) is directly connected to the rear side of the main pump 23 of the engine 19 and is also driven by the engine 19.

FIG. 5 is a hydraulic circuit diagram of the Macadam roller.
As described above, the main pump 23 and the auxiliary pump 24 are directly connected to the engine 19, and the main pump 23 forms a closed circuit with the front and rear traveling hydraulic motors 7 and 8. The hydraulic oil discharged from the main pump 23 is supplied to the traveling hydraulic motors 7 and 8, thereby driving the front and rear rolling wheels 2 and 3. In the present embodiment, a hydraulic traveling device is configured by the main pump 23 and the traveling hydraulic motors 7 and 8.
The hydraulic fluid is appropriately replenished from the hydraulic fluid tank 25 of the HST by a charge pump (not shown) according to the leakage of the hydraulic fluid from the closed circuit, but the description is omitted because it is not directly related to the gist of the present invention.

  The auxiliary pump 24 is connected to the hydraulic oil tank 25 via a suction hose 26 and a suction filter 27, and is connected to a load application valve 29 via a valve hose 28. The load application valve 29 is connected to a return hose 30 and a return filter 31. To the hydraulic oil tank 25. The load application valve 29 includes an opening / closing valve 29 a and a relief valve 29 b, and these valves 29 a and 29 b are connected in parallel between the valve hose 28 and the return hose 30.

The hydraulic oil in the hydraulic oil tank 25 is pumped up by the auxiliary pump 24 through the suction filter 27, and the hydraulic oil discharged from the auxiliary pump 24 is supplied to the open / close valve 29a and the relief valve 29b. Since the open / close valve 29a is normally opened, the hydraulic oil flows through the open / close valve 29a and returns to the hydraulic oil tank 25 through the return filter 31. Further, since the on-off valve 29a is closed during the regeneration process, the flow of the hydraulic oil to the hydraulic oil tank 25 is blocked until the hydraulic oil pressure exceeds the set pressure of the relief valve 29b, and the set pressure is reduced. If it exceeds, the hydraulic oil is allowed to flow and returned to the hydraulic oil tank 25.
By repeating such an operation of the relief valve 29b, the discharge pressure of the auxiliary pump 24 increases. Along with this, the load on the engine 19 increases, so that the temperature rise of the aftertreatment device 20 is promoted by the rise of the exhaust temperature, and the collected particulate matter is efficiently incinerated.

  As described above, the load application valve 29 is necessary for increasing the discharge pressure of the auxiliary pump 24. The valve 29 is disposed at any location, and the auxiliary pump 24, the load application valve 29, and the hydraulic oil tank are disposed. 25 need to be connected to each other by hydraulic piping. However, as described in [Problems to be Solved by the Invention], there is no room for installing the load application valve 29 in the front vehicle body 4.

  In view of such a problem, the present inventor pays attention to a capacity difference between the fuel tank 33 of the engine 19 and the hydraulic oil tank 25 of the HST disposed on the left and right sides of the front vehicle body 4, and performs an optimal load application. The installation location of the valve 29 was found. Hereinafter, the installation state of the hydraulic oil tank 25, the load application valve 29, and the hydraulic piping will be described in detail.

Corners are formed between the left and right front rolling wheels 2 and the left and right side walls 4b and 4c of the front vehicle body 4, respectively, and the left corner is formed using the corners which are dead spaces. The fuel tank 33 of the engine 19 is disposed on the right side, and the HST hydraulic oil tank 25 is disposed on the right corner. Reference numeral 34 denotes a boarding / alighting step.
Since the hydraulic oil tank 25 has a small capacity compared to the fuel tank 33, a dead space remains on either the upper or lower side of the hydraulic oil tank 25. Therefore, in the present embodiment, the hydraulic oil tank 25 is installed at an upper position on the right side wall 4c of the front vehicle body 4, and the auxiliary pump 24 is installed by utilizing the space formed below the hydraulic oil tank 25.

  As shown in FIG. 2, a casing 36 having a height substantially coincident with the right side wall 4c of the front vehicle body 4 is disposed at the above right corner, and the inside of the casing 36 is vertically separated by a partition wall 36a. The chamber that is divided and defined on the upper side functions as the hydraulic oil tank 25. The hydraulic oil is stored in the hydraulic oil tank 25, and the above-described suction filter 27 and return filter 31 are fixed on the inner partition wall 36a. The chamber defined on the lower side functions as a valve chamber 37, and an opening / closing valve 29 a and a relief valve 29 b of the load application valve 29 are integrally fixed to a front side wall 37 a in the valve chamber 37.

  The connection part of the suction filter 27 and the return filter 31 is exposed to the lower surface of the partition wall 36a in the valve chamber 37, and one end of the suction hose 26 described above is connected to the connection part of the suction filter 27. It is pulled out into the engine room 18 of the front vehicle body 4 through a through hole 38 (shown in FIG. 2) penetrating the right side wall 4c of the vehicle body 4, and the other end is connected to the suction side of the auxiliary pump 24. Yes. One end of the above-described valve hose 28 is connected to the discharge side of the auxiliary pump 24, and the valve hose 28 is drawn into the valve chamber 37 through a through hole 39 penetrating the right side wall 4 c of the front vehicle body 4. The other end is connected to one end of the load application valve 29.

  One end of the return hose 30 described above is connected to the other end of the load application valve 29, and the return hose 30 is drawn into the engine room 18 through a through hole 40 penetrating the right side wall 4 c of the front vehicle body 4. After that, it is again drawn into the valve chamber 37 through the through hole 41 and connected to the connection portion of the return filter 31. The arrangement of the return hose 30 bypassing the inside of the valve chamber 37 is for ensuring the minimum bending radius of the hose. If the minimum bending radius can be ensured, the load hose valve 29 and The return filter 31 may be directly connected to the return hose 30.

  Further, since the port diameters of the connecting portions of the load application valve 29 and the return filter 31 are different, the return hose 30 is configured by connecting hoses having different diameters by a joint 42 as shown in FIGS. Of course, when the diameters of both the connecting portions are the same, it is not necessary to adopt such a configuration, and a single hose may be used as the return hose 30.

  As described above, in the Macadam roller 1 according to the present embodiment, the hydraulic oil tank 25 is disposed in the corner that is a dead space formed between the right front roller 2 and the right side wall 4c of the front vehicle body 4. The load application valve 29 is installed by utilizing a space remaining as a dead space below (a position where the valve chamber 37 is located in the present embodiment). Therefore, since it is not necessary to install the load application valve 29 in the engine room 18 of the front vehicle body 4, the load application valve 29 can be installed without affecting the installation layout of the equipment in the engine room 18. it can.

  Further, according to this layout, the hydraulic oil tank 25 and the load application valve 29 are close to each other, and the casing 36 is located on the right side of the auxiliary pump 24 in the engine room 18. The hydraulic oil tank 25 and the load application valve 29 are disposed at positions close to the front-rear direction across the right side wall 4c of the front vehicle body 4. Therefore, the respective pipe lengths of the suction hose 26, the valve hose 28, and the return hose 30 can be shortened, and the pipe resistance when the hydraulic oil flows can be reduced.

  In particular, in the present embodiment, the auxiliary pump 24 and the casing 36 substantially coincide with each other in the front-rear direction, so the auxiliary pump 24, the hydraulic oil tank 25, and the load application valve 29 are very close to each other. Therefore, the pipe length of the suction hose 26 that connects the hydraulic oil tank 25 (specifically, the suction filter 27) and the auxiliary pump 24 and the valve hose 28 that connects the auxiliary pump 24 and the load application valve 29 is shortened to the maximum. can do.

  In particular, in this embodiment, the load application valve 29 is not simply installed in the space below the hydraulic oil tank 25, but in a valve chamber 37 formed integrally with the hydraulic oil tank 25 by a common casing 36. A load application valve 29 is provided. Therefore, the hydraulic oil tank 25 and the valve chamber 37 can be formed at a very low cost, and the load application valve 29 can be protected from dust and rainwater by being accommodated in the valve chamber 37, so that the trouble can be minimized. can do.

This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the above-described embodiment, the casing 36 is divided into the upper and lower parts, the upper side is used as the hydraulic oil tank 25, and the lower side is used as the valve chamber 37. The load application valve 29 is housed inside, but the present invention is not limited to this. . For example, the vertical positional relationship between the hydraulic oil tank 25 and the valve chamber 37 may be reversed, or the valve chamber 37 may be formed separately from the hydraulic oil tank 25. Further, the load application valve 29 may be simply disposed in a space formed either above or below the hydraulic oil tank 25.
In the above embodiment, the load application valve 29 is used as the discharge pressure increasing means. However, the present invention is not limited to this as long as the discharge pressure of the auxiliary pump 24 can be increased. For example, an orifice may be used.

2 Front roller wheel 3 Rear roller wheel 4 Front car body
4b Left side wall 4c Right side wall 7, 8 Travel hydraulic motor (travel hydraulic device)
19 Engine 20 Post-processing device 23 Main pump (travel hydraulic device)
24 Auxiliary pump 25 Hydraulic oil tank 29 Load valve (discharge pressure increasing means)
36 Casing 36a Bulkhead 37 Valve chamber

Claims (2)

A main pump is directly connected to the rear side of the engine mounted in the vehicle body, and the hydraulic oil discharged from the main pump is supplied to the traveling hydraulic motor by driving the engine. A hydraulic travel device that drives the pressure wheel to travel the vehicle;
A post-processing device that is provided on an exhaust pipe of the engine and collects particulate matter contained in the exhaust gas of the engine;
A fuel tank disposed at a corner formed between the left and right rolling wheels and the side wall of the vehicle body;
A hydraulic oil tank disposed at a corner formed between the other rolling wheel and the side wall of the vehicle body;
An auxiliary pump directly connected to the engine together with the main pump;
A discharge pressure increasing means for increasing the load of the engine by increasing the discharge pressure of the auxiliary pump in the regeneration process of incinerating the particulate matter collected in the post-processing device;
A casing is disposed at a corner formed between the other rolling wheel and the side wall of the vehicle body, and the inside of the casing is vertically divided into two by a partition, and one of the upper and lower chambers defined is An exhaust gas purifying apparatus for a compaction machine, characterized in that the hydraulic oil tank is provided, and the other chamber is a valve chamber in which the discharge pressure increasing means is disposed . 2. The exhaust gas purification apparatus for a compaction machine according to claim 1, wherein the hydraulic oil tank and the space are disposed at positions that substantially coincide with the auxiliary pump in the front-rear direction.

Images