JP2013155706A - Diesel engine with exhaust gas treatment device of tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution firmly and securely mounting an exhaust gas treatment device on an engine.SOLUTION: A diesel engine with an exhaust gas treatment device of a tractor is constituted such that front supporting stays (26) and rear supporting stays (28) are erected in front of and behind an engine body (25), a planar supporting bracket (29) is attached to an upper part of the front and rear supporting stays (26), (28), an exhaust gas treatment device (30) is mounted on the supporting bracket (29), a first exhaust pipe (23) from the engine body (25) is in communication with the exhaust gas treatment device (30), a second exhaust pipe (40) in communication with a muffler is coupled from the exhaust gas treatment device (30).

Description

  The present invention relates to an exhaust gas processing device mounting structure for a diesel engine of a tractor.

Diesel engine exhaust gas treatment equipment repairs particulate matter such as black smoke (hereinafter referred to as “PM”) in exhaust gas through exhaust gas through a diesel particulate filter (hereinafter referred to as “DPF”). NO ₂ is produced from NO in the exhaust gas by the oxidation catalytic action of an oxidation catalytic converter (hereinafter referred to as “DOC”) arranged in the gas passage, and PM collected by DPF using this NO ₂ as an oxidizing material is incinerated. Playback processing is in progress.

  This exhaust gas treatment device needs to maintain a high temperature state in order to incinerate PM. For example, as described in Japanese Patent Application Laid-Open No. 2011-247231, an exhaust manifold is attached to a lateral surface of a cylinder head. An exhaust gas treatment device is attached to the manifold.

JP 2011-247231 A

  In the above-described prior art, since the exhaust gas treatment device has a cantilever structure attached to the exhaust manifold, the exhaust manifold may leak due to the shielding of the exhaust manifold due to the vibration of the engine.

  Accordingly, an object of the present invention is to provide a configuration in which the exhaust gas treatment device is firmly and reliably mounted on the engine.

The problems of the present invention are solved by the following technical means.
In the first aspect of the present invention, a front support stay 26 and a rear support stay 28 are erected on the front and rear of the engine E main body, and a planar support bracket 29 is attached to the upper portions of the front and rear support stays 26, 28, An exhaust gas processing device 30 is mounted on the support bracket 29, and the first exhaust pipe 23 from the engine body 25 is connected to the exhaust gas processing device 30 and the second exhaust pipe 40 is connected from the exhaust gas processing device 30 to the muffler. A diesel engine with a tractor exhaust gas treatment device constructed as described above was obtained.

  With this configuration, the exhaust gas treatment device 30 is firmly supported by the support brackets 29 that are firmly attached to the front and rear support stays 26 and 28 attached to the front and rear of the engine body 25. Will not break or cause exhaust gas leakage.

  The invention described in claim 2 is characterized in that the support bracket 29 for mounting the exhaust gas processing device 30 is provided with a cover mounting bracket 33 for mounting the bonnet cover 22a. A diesel engine with a device was used.

With this configuration, the bonnet cover 22a is attached to the support bracket 29, and the mounting configuration of the bonnet cover 22a is simplified.
According to a third aspect of the present invention, in the configuration of the first aspect, the support bracket 29 for mounting the exhaust gas treatment device 30 is provided with a compressor mounting bracket 32 for mounting the compressor. A diesel engine with a tractor exhaust gas treatment device was used.

With this configuration, the compressor is attached to the support bracket 29 that is firmly supported by the engine body 25, and the maintenance of the compressor is facilitated.
The invention according to claim 4 is characterized in that a steering shunt mounting bracket 31 for steering the front wheel 12 is provided on the support bracket 29 on which the exhaust gas treatment device 30 is mounted. A diesel engine with an exhaust gas treatment device was used.

  With this configuration, maintenance of the steering shunt can be easily performed on the support bracket 29.

  In the first aspect of the invention, the exhaust gas treatment device 30 is firmly supported by the support brackets 29 that are firmly attached to the front and rear support stays 26 and 28 attached to the front and rear of the engine body 25. The exhaust pipe will not be damaged or exhaust gas leakage will not occur even if the vibration is.

According to the second aspect of the present invention, the bonnet cover 22a is attached to the support bracket 29, and the attachment configuration of the bonnet cover 22a is simplified.
According to the third aspect of the present invention, the compressor is attached to the support bracket 29 that is firmly supported by the engine body 25, so that the maintenance of the compressor is facilitated.

  According to the fourth aspect of the present invention, maintenance of the steering shunt can be easily performed on the support bracket 29.

It is a left view of a tractor. It is a system configuration figure of a pressure accumulation type fuel injection device. It is a diagram which shows the relationship between the engine speed and output torque by control mode. It is the perspective view which looked at the engine from the left front. It is the perspective view which looked at the engine from the right front. It is the perspective view which looked at the engine from the right rear. It is a perspective view of an engine mounting part. It is a partial expansion perspective view of an engine mounting part. It is a top view of an engine. It is a perspective view of the engine mounting part of another Example. It is a perspective view of hydraulic piping.

Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.
FIG. 1 shows a side view of a tractor. This tractor includes front wheels 12 and 12 and rear wheels 13 and 13 on the front and rear sides of the airframe, and transmits the rotational power of the engine E mounted in the hood 22 at the front of the airframe to the transmission case. It is configured to decelerate appropriately by a transmission device in 35 and transmit to the front wheels 12, 12 and the rear wheels 13, 13.

  A steering handle 16 is provided at the handle post 15 in the cabin 14 at the center of the body, and a seat 17 is provided behind the steering handle 16. A forward / reverse lever 18 is provided below the steering handle 16 to switch the advancing direction of the aircraft to the front / rear direction. When the forward / reverse lever 18 is tilted forward, the aircraft moves forward, and when it is tilted backward, the aircraft moves backward.

A work machine 21 such as a rotary is mounted on the rear part of the machine body so as to be movable up and down with a three-point link, and the work machine 21 is driven by a PTO shaft 71 protruding rearward from the transmission case 35.
An accelerator lever (not shown) for adjusting the engine speed is provided on the opposite side of the forward / reverse lever 18 with the handle post 15 in between, and the engine speed is similarly set at the right corner of the step floor 19. An accelerator pedal 23 for adjustment and left and right brake pedals 24 for operating brakes on the left and right rear wheels 13, 13 are provided. A clutch pedal 20 is provided at the left corner of the step floor 19.

  The engine E is a diesel engine provided with an accumulator fuel injection device, and is applied to, for example, a multi-cylinder diesel engine, but may be a gasoline engine. As shown in FIG. 2, the pressure accumulation type fuel injection device pressurizes the fuel pumped up from the common rail 1 for accumulating high pressure fuel corresponding to the injection pressure, the pressure sensor 2 attached to the common rail 1, and the fuel tank 3. The operation of the high pressure pump 4 for pumping to the common rail 1, the fuel injection nozzle 6 for injecting the high pressure fuel accumulated in the common rail 1 into the cylinder 5 of the engine E, the high pressure pump 4, the fuel injection nozzle 6 and the like is controlled. It comprises a control device (ECU) 70 and the like. ECU is an abbreviation for engine control unit.

Thus, the common rail 1 is for injecting fuel to each cylinder 5 of the engine E, and for adjusting the fuel supply pressure to the required pressure.
The fuel in the fuel tank 3 is sucked into the high-pressure pump 4 driven by the engine E through the fuel filter 7 through the suction passage, and the high-pressure fuel pressurized by the high-pressure pump 4 is guided to the common rail 1 through the discharge passage 8. Stored.

  The high-pressure fuel in the common rail 1 is supplied to the fuel injection nozzles 6 corresponding to the number of cylinders through the high-pressure fuel supply passages 9, and the fuel injection nozzles 6 are operated based on commands from the ECU 70, so The surplus fuel (return fuel) from each fuel injection nozzle 6 is guided to the common return passage 68 by each return passage 10 and returned to the fuel tank 3 from the common return passage 68.

  Further, a pressure control valve 11 is provided in the high pressure pump 4 to control the fuel pressure (common rail pressure) in the common rail 1, and this pressure control valve 11 is sent from the high pressure pump 4 to the fuel tank 3 by a duty signal from the ECU 70. The flow area of the common return passage 22 for surplus fuel to the fuel is adjusted, whereby the fuel discharge amount to the common rail 1 side can be adjusted to control the common rail pressure.

  Specifically, the target common rail pressure is set according to the engine operating conditions, and the common rail pressure is feedback-controlled through the pressure control valve 11 so that the common rail pressure detected by the rail pressure sensor 2 matches the target common rail pressure. It is configured.

  As shown in FIG. 3, the ECU 70 of the diesel engine E having the common rail 1 in the work vehicle (agricultural work machine) has three types of driving modes A, normal work mode B, and heavy work mode C in relation to the rotational speed and the output torque. The configuration has a control mode.

  The traveling mode A is droop control in which the output also varies with the variation of the engine speed. It is used when traveling without farming. For example, when the traveling speed is decelerated or stopped by applying a brake, the engine speed decreases as the traveling load increases, so that the traveling speed can be reduced or stopped safely.

  The normal work mode B is isochronous control in which the engine speed is constant and the output is changed according to the load even when the load varies. It is used for normal farm work. For example, in the case of a tractor, the cultivated land is hard at the time of plowing work, and the plowing blade is resisted. Is the time.

  In the heavy work mode C, in addition to the isochronous control in which the engine speed is constant and the output is changed according to the load even when the load fluctuates in the same manner as the normal work mode B, the engine speed is increased when the load is close to the limit. This is a control with heavy load control that increases In particular, it is used when farming near the load limit. For example, when plowing work with a tractor, the engine output increases beyond the normal limit even when encountering hard cultivated land, so work can be performed efficiently without interruption. .

  These work modes A, B, and C are the operation of a work mode changeover switch that can switch between the work modes A, B, and C, or the shift operation of a traveling speed change lever of a farm vehicle (tractor, combine, rice transplanter, etc.) Alternatively, it is configured to be switched by an on / off operation or the like of a working clutch (rotary if it is a tractor, and cutting and threshing portion if it is a combine).

  In diesel engine E, pilot injection that injects a small amount of fuel in a pulse manner prior to main injection makes it possible to shorten the ignition delay, reduce the knocking noise peculiar to diesel engine E, and reduce noise It has a simple structure.

  This pilot injection is performed only once or twice before the main injection. By using the accumulator fuel injection device of the common rail 1, pilot injection is performed according to the situation of the engine E. Thus, it becomes possible to reduce the noise and the generation of white smoke or black smoke due to incomplete combustion. Further, by performing pilot injection in which a small amount of fuel is pulse-injected prior to main injection, the amount of nitrogen oxides in the exhaust gas is reduced.

  4 to 6 are external views of the engine E. A flat support bracket supported on the upper cylinder head of the engine body 25 by a front support stay 26 on the output shaft side and a rear support stay 28 on the cooling fan 27 side. 29, and an exhaust gas treatment device 30 is mounted on the support bracket 29.

  A steering shunt mounting bracket 31 for mounting a steering shunt for steering the front wheels 12 is mounted on the front support stay 26, a compressor mounting bracket 32 for mounting a compressor is mounted on the front side of the support bracket 29, and a rear side of the support bracket 29 is mounted. A cover mounting bracket 33 for mounting the bonnet cover 22a of the bonnet 22 is attached to the hood 22.

  In the embodiment shown in FIG. 10, the exhaust gas treatment device 30 is suspended by a support frame 53 and a cover support part 54 and a damper support part 55 for attaching the bonnet cover 22 a of the bonnet 22 are provided on the upper surface of the support frame 51. It can be installed.

7 and 8 show a state where the engine E is mounted on the vehicle body frame 36. FIG.
An intercooler 37 is mounted in front of the engine E, and a battery 38 is mounted on the front side. An air cleaner 39 is attached to the front upper portion of the intercooler 37, and air is supplied from the air cleaner 39 to the engine E through the turbo 50 and the intercooler 37 through the intake pipe 34. The turbo intake pipe 51 from the air cleaner 39 to the turbo 50 and the turbo exhaust pipe 52 from the turbo 50 to the intercooler 37 are arranged side by side in parallel to save space as shown in FIG. The turbo intake pipe 51 and the turbo exhaust pipe 52 may be integrally molded resin molding.

  The turbo 50 is driven from the cylinder 5 of the engine body 25 and the purified exhaust gas introduced into the exhaust gas treatment device 30 incorporating DPF and DOC from the first exhaust pipe 23 is purified in front of the vehicle body frame 36 by the second exhaust pipe 40. It is discharged downward.

As shown in FIG. 9, the exhaust gas treatment device 30 provided at the upper part of the engine E has one pressure sensor 48 and three temperature sensors 49 at a position lower than the upper end of the exhaust gas treatment device 30 on the front side. Provided.
An engine filter 41 is attached to the right side surface of the engine E.

  A fuel tank 46 is mounted on a tank mount 45 provided on the right side of the vehicle body frame 36, and a filter bracket 44 having a pre-filter 42 and a main filter 43 attached to the front side surface of the tank mount 45. The attachment position of the filter bracket 44 can be changed. When the front loader support arm 47 is attached to the vehicle body frame 36, the filter bracket 44 moves to a lower position.

  FIG. 11 shows an oil pipe provided along the periphery of the transmission case 35. The main pump 56 and the sub pump 58 are provided on the front left side of the engine E, and the main relief valve 60 provided on the rear right side of the transmission case 35 is shown. The main delivery hose 59 is piped along the transmission case 35. The main flange 56a of the main pump 56 and the sub flange 58a of the sub pump 58 are connected by a suction pipe 58 that avoids the timing gear case of the engine E to the left, and the main pipe 64 is connected from the main pump 56 along the left side surface of the transmission case 35. Piping to the rear mission case. 65 is a strainer.

A power steering hose 66 from the steering controller 63 to the power steering cylinder 62 passes through the radiator bracket with a hole.
67 is a cooler pipe to the oil cooler.

E Diesel engine 22a Bonnet cover 23 First exhaust pipe 25 Engine body 26 Front support stay 28 Rear support stay 29 Support bracket 30 Exhaust gas treatment device 31 Steering shunt mounting bracket 32 Compressor mounting bracket 33 Cover mounting bracket 40 Second exhaust pipe

Claims (4)

  A front support stay (26) and a rear support stay (28) are provided up and down on the front and rear of the engine body (25), and a flat support bracket (29) is provided above the front and rear support stays (26) and (28). And mounting the exhaust gas treatment device (30) on the support bracket (29), communicating the first exhaust pipe (23) from the engine body (25) to the exhaust gas treatment device (30) and exhaust gas treatment. A diesel engine with an exhaust gas treatment device for a tractor configured by connecting a second exhaust pipe (40) leading from the device (30) to the muffler.   The exhaust gas processing apparatus for a tractor according to claim 1, wherein a cover mounting bracket (33) for mounting the bonnet cover (22a) is provided on the support bracket (29) for mounting the exhaust gas processing apparatus (30). Diesel engine with.   The diesel engine with an exhaust gas treatment device for a tractor according to claim 1, wherein a compressor mounting bracket (32) for attaching a compressor is provided on a support bracket (29) on which the exhaust gas treatment device (30) is mounted.   The exhaust of the tractor according to claim 1, wherein a steering shunt mounting bracket (31) for steering the front wheel (12) is provided on the support bracket (29) on which the exhaust gas treatment device (30) is mounted. Diesel engine with gas treatment device.

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