JP6733118B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle such as a combine equipped with a diesel engine, and more particularly to a work vehicle for purifying exhaust gas discharged from the diesel engine by a particulate matter removing device (diesel particulate filter, hereinafter referred to as DPF). ..

In general, exhaust gas emitted from a diesel engine contains particulate matter (PM), and a DPF for removing the particulate matter from the exhaust gas is connected to the diesel engine.

Conventionally, in a combine, the DPF is arranged between the Glen tank and the threshing unit with its longitudinal direction in the front-rear direction, and the exhaust gas from the diesel engine arranged in the engine room under the driver's seat is flexible. It is introduced into the DPF via a good-side pipe having the above (Patent Document 1). The DPF is surrounded by a case having a double structure including an inner case and an outer case, and the above-mentioned upper-side pipe and the lower-side pipe connected to the lower side of the DPF are respectively covered with a cover. Is configured to close the opening between the inner case and the outer case.

In addition, there is also proposed a combine in which a DPF is arranged in the lower rear part of the engine room with the longitudinal direction being the left-right direction (Patent Document 2). Exhaust gas from the diesel engine in the engine room is guided to the DPF via the connection pipe, purified by the DPF, and then discharged from the tail pipe. The connection pipe is arranged in the engine room, and the exhaust gas in the connection pipe is kept at a high temperature.

Japanese Patent No. 5936004 JP, 2016-43880, A

A diesel engine mounted on a work vehicle such as a combine is mounted on a machine body via a vibration-proof rubber, and the DPF is directly fixed on the machine body frame. Therefore, the pipe connecting the vibrating diesel engine and the DPF includes the flexible pipe for absorbing the vibration of the diesel engine.

The upper-side piping of Patent Document 1 is completely covered by the cover including the flexible pipe portion up to the case of the DPF, and the opening with the case is closed. For this reason, the exhaust gas is not excessively cooled by being exposed to the engine cooling air, but when maintaining the good side pipe, the good side must be removed unless the completely covered cover is removed. You can't get close to the pipes, which requires troublesome work.

Although the connection pipe of Patent Document 2 is housed in the engine room, it is exposed to the cooling air that cools the diesel engine, and particularly the flexible pipe portion that has a bellows structure and is easily heat-exchanged directly into the cooling air. When exposed, it is easy to lower the temperature of the exhaust gas, and it may be difficult to maintain the temperature required to regenerate the DPF.

Therefore, an object of the present invention is to provide a work vehicle that solves the above-mentioned problems by covering the flexible pipe portion of the connection pipe with a cover and facilitating removal of the cover.

The present invention relates to a work vehicle (1) comprising a diesel engine (E), wherein exhaust gas of the diesel engine is guided to a particulate matter removing device (DPF) (35) through a connecting pipe (37),
The connection pipe (37) includes a flexible pipe (37a) in at least a part thereof, and the flexible pipe is arranged so as to face a passage of cooling air.
The diesel engine (E) is housed in an engine room (11) through which the cooling air blows from the outside to the inside of the airframe,
The cover (42 ) has a cross-section having a protrusion (42a) on one side, and the opposite side of the protrusion is an open surface (42b), and prevents cooling air from directly hitting the flexible pipe (37a). ) And
A pillar (29) inside the machine body, which is erected on the machine frame (21) and constitutes the engine room (11);
A pair of mounting lugs (43, 43) provided on upper and lower side surfaces (42c) (42d) between the projecting portion (42a) and the open surface (42b) of the cover (42),
Upper and lower mounting brackets (45, 45), which are provided on the support column (29) at predetermined vertical intervals and are offset (Y) in the longitudinal direction of the cover (42) ,
In the cover (42), the pair of mounting lugs (43, 43) are mounted on the upper and lower mounting brackets (45, 45), so that the protruding portion (42a) becomes upwind of the cooling air, It is attached to the column (29) so that the open surface (42b) is leeward.
A work vehicle characterized by the above.

It should be noted that the reference numerals in the above parentheses are for the purpose of contrasting with the drawings, but do not have any influence on the configuration described in the claims.

According to the present invention of claim 1, since the flexible pipe is interposed in the connection pipe connecting the diesel engine and the DPF, the vibration of the diesel engine is absorbed by the flexible pipe, and the durability of the diesel engine and the DPF is improved. yet be capable connected without problem provided to cover the high flexible pipe of heat efficiency in the cover, the cooling air is prevented from directly impinging on the flexible pipe, and the cover is a separate member from the connecting pipe struts Since it is fixed to the connection pipe, heat is not radiated from the connection pipe through the connecting portion, and it is possible to prevent the exhaust gas of the connection pipe from lowering in temperature and maintain the performance of the DPF.

In addition , since the diesel engine is housed in the engine room and the cover is fixed to the pillars inside the engine room, the cover is more firmly attached to the pillars without requiring a member dedicated to support. Can be supported.

Further , the flexible pipe portion of the connection pipe is covered by the cover having the protruding portion on the windward side and the open surface on the leeward side, so that the cooling wind is not guided by the cover and hits the flexible pipe. Since the upper and lower mounting lugs are offset with respect to the longitudinal direction of the cover, the turning surface in the plane including the longitudinal direction of the cover with respect to the connecting pipe becomes large, and the cover has an open surface, so that the connecting pipe has a predetermined length. The cover can be easily attached and detached, and maintenance such as replacement of the heat insulating material is facilitated.

The side view which shows the combine which concerns on embodiment of this invention. The plan view. The side view seen from the driver's seat of the above-mentioned combine, and the inside of a Glen tank. The rear view seen from the back of the important section of the above-mentioned combine. (A) is a side view showing a cover, and (b) is a view showing a mounting portion of the cover.

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the combine 1 which is a work vehicle has a body 3 supported by a pair of left and right traveling devices 2, which are crawler type traveling devices, and in front of the body 3, A pretreatment unit 5 for cutting grain culms in a field is provided so that it can be raised and lowered. A driver's seat 6 on which a worker operates is provided on one side in front of the machine body 3 (on the right side of the machine body), and on the other side (on the left side of the machine body) by the pretreatment unit 5 for cutting and carrying. A threshing unit 7 (see FIG. 2) for threshing and selecting the milled culms is provided. A grain tank 9 for storing the grains that have been threshed and sorted by the threshing unit 7 is arranged behind the driver's seat 6, and behind the grain tank 9, the grain tank 9 is stored in the grain tank 9. A discharge auger 10 is provided for discharging the broken grains to the outside of the machine.

As shown in FIG. 3, an engine room 11 in which an engine E made of a diesel engine is stored is arranged below the driver's seat 8 in the driver's seat 6 and above the engine room 11. An air cleaner room 12 in which an air cleaner (not shown) is housed is provided. The engine room 11 and the air cleaner room 12 are separated by a partition wall 13.

In the engine room 11, an intake port 16 is opened on the right side surface of the machine body 3 on which the outer wall 15 of the driver's seat 6 is provided, and the intake port 16 has a net-like dust-proof net. The engine E is mounted on a body frame 21 via a vibration-proof rubber 22, and a radiator that cools the engine E is provided on the side opposite to the threshing portion 7 of the engine E and a cooling inside the engine room 11. A cooling fan 25 or the like for sucking wind to cool the radiator is arranged. An output pulley 27 fixed to the output shaft 26 is arranged on the threshing section 7 side of the engine E, and power is transmitted from the output pulley to each part of the combine.

As shown in FIGS. 3 and 4, at the left and right portions of the rear surface of the engine room 11 and the air cleaner room 12, two lower ends are fixed to the body frame 21, and two columns 29 and 30 are erected. Partition plates serving as rear walls 31 and 32 of the engine room 11 and the air cleaner room 12 are attached to 29 and 30, respectively. The rear wall 31 of the engine room 11 is provided with an air exhaust cover 33 that opens (33a) inward (on the threshing portion side), and a part of the cooling air is supplied from the cooling fan 25 supplied to the engine room 11. Are exhausted from the opening 33a of the exhaust cover 33. The inside of the machine body of the engine room 11 (on the threshing portion 7 side) is open, and a part of the diesel engine E projects from the open.

Since the grain tank 9 guides the grains to the helix arranged in the lower portion thereof, the lower surface on the threshing portion 7 side is inclined, and a space is formed below the lower surface. In the space, the DPF 35 is fixedly arranged on the machine body frame 21 with its longitudinal direction being the machine body front-rear direction. The inlet 35a of the DPF 35 and the exhaust hole 36 of the diesel engine E are connected by a connecting pipe 37, and a heat insulating material is wound around the connecting pipe 37. The connection pipe 37 is formed by connecting a plurality of pipes of a predetermined shape with flanges, and is arranged from the exhaust hole 36 located inside the engine E (on the threshing portion 7 side) to the inside of the support column 29 (the threshing). It is guided to the introduction port 35a of the DPF 35 through the section 7 side). A flexible pipe 37a having an uneven (bellows) shape is connected to a part of the connection pipe 37, and the vibration of the engine E supported by the vibration-proof rubber is absorbed by the flexible pipe 37a. The flexible pipe 37a is arranged at a position crossing the support column 29.

The DPF (particulate matter removal device) 35 collects particulate matter (PM) contained in the exhaust gas of the diesel engine E and removes it by burning the PM, so the exhaust gas from the engine is heated to a high temperature. It is preferable to supply it while keeping it. The exhaust gas purified by the DPF 35 is guided through a muffler (dephasor) 41 via an exhaust pipe 40 and is discharged.

A cover 42 is arranged between the connection pipe 37 and the column 29, as shown in FIGS. The cover 42 has a pentagonal cross section in which the opposite side of the top portion 42a is opened (42b), and mounting lugs 43, 43 are integrally fixed to both side surfaces 42c, 42d. Mounting brackets 45, 45 are provided so as to protrude from the support column 29 at a predetermined interval, and the cover 42 is mounted on the support column 29 by fixing the mounting lugs 43, 43 to the mounting brackets 45, 45 with bolts. In the attached state, the cover 42 covers the entire length of the flexible pipe 37a, and the top 42a of the cover 42 faces the engine room 11 and the opening 33a of the exhaust cover 33. ing. That is, the cover 42 is arranged so that the protruding portion, which is the top portion 42a, faces the windward side of the cooling air A, and the open surface 42b thereof is leeward. Note that the cover 42 is not limited to have a pentagonal cross section, and may have any shape such as a polygon or an oval having a protrusion on the windward side and an open surface on the leeward side.

The combine 1 is driven by the power of the diesel engine E. The cooling fan 25 is rotated by the rotation of the diesel engine E, and the outside air is introduced into the engine room 11 from the intake port 16 on the side of the machine by the cooling fan, and the cooling air cools the radiator and the like. The air is discharged from the open surface inside 11 and the opening 33 a of the air exhaust cover 33.

Exhaust gas accompanying the driving of the diesel engine E is guided from the exhaust hole 36 to the DPF 35 through the connection pipe 37, is purified by the DPF, and is exhausted from the muffler 41. Since the connection pipe 37 connects the diesel engine E that is rubber-mounted and vibrates to the DPF 35 that is fixed to the body frame 21, it is necessary to partially interpose the flexible pipe 37a that absorbs the vibration of the diesel engine E. The flexible pipe 37a is arranged at a position crossing the rear wall 31 of the engine room 11, and is covered over the entire length by the pentagonal cover 42.

Even if the connection pipe 37 is wound with a heat insulating material, the exhaust gas inside is cooled when the cooling wind directly hits the connection pipe 37. In particular, the cooling action of the flexible pipe 37a having the uneven shape and having a large contact area with the cooling air is increased. The cooling air flows from the top portion 42a of the cover 42 through both side surfaces 42c to the rear of the open surface 42b (on the threshing portion side) and does not directly hit the flexible pipe 37a. As a result, the high-temperature exhaust gas from the diesel engine E is guided to the DPF 35 through the connection pipe 37 without being excessively cooled, and the DPF 35 can regenerate the exhaust gas maintained at a relatively high temperature. it can.

The upper and lower mounting lugs 43, 43 of the cover 42 are arranged offset (Y) with respect to the longitudinal direction of the cover 42. Therefore, the distance X2 between the mounting brackets 45, 45 for mounting the mounting lugs 43, 43 is longer than the distance X1 between the mounting brackets when the mounting lugs are arranged so as to be orthogonal to the longitudinal direction line of the cover. As a result, the rotation angle of the cover 42 in the longitudinal direction (the rotation angle in the plane parallel to the paper surface of FIG. 5A) becomes large, and the cover 42 can be easily attached and detached. When the cover 42 is removed during maintenance such as replacement of the heat insulating material of the connection pipe 37, the distance X2 is larger than the distance X1. Therefore, the rotation of the cover 42 on the paper surface of FIG. The degree of freedom of the corners is increased, the cover 42 is rotated, and the cover 42 is rotated about the axis, so that the cover 42 is easily removed from the open surface 42b.

Although the above embodiment is applied to the combine harvester, the present invention is not limited to this and is also applicable to any work vehicle equipped with a diesel engine. Moreover, the DPF can be applied to all types of DPFs.

1 work vehicle (combined)
11 Engine room 29 Fixing member (support)
35 Particulate matter removal device (DPF)
37 Connection Pipe 37a Flexible Pipe 42 Cover 42a Projection (Top)
42b Open surface 42c, 42d Side surface 43 Mounting lug 45 Mounting bracket E Diesel engine Y Offset

Claims (1)

In a work vehicle equipped with a diesel engine and guiding exhaust gas of the diesel engine to a particulate matter removing device through a connecting pipe,
The connection pipe includes a flexible pipe in at least a part thereof, and the flexible pipe is arranged so as to face a passage of cooling air.
The diesel engine is housed in an engine room where the cooling air blows from the outside to the inside of the airframe.
A cross-section having a protruding portion on one side, and having a shape in which the opposite side of the protruding portion is an open surface, and a cover that prevents cooling air from directly hitting the flexible pipe ,
Stands on the inside of the machine frame that stand upright on the machine frame, and that make up the engine room,
A pair of mounting lugs provided on the upper and lower side surfaces between the projecting portion of the cover and the open surface,
Upper and lower mounting brackets provided on the column at a predetermined vertical interval and offset in the longitudinal direction of the cover ,
The cover is attached to the column so that the protrusion is located on the windward side of the cooling air and the open surface is located on the leeward side by attaching the pair of attachment lugs to the upper and lower attachment brackets.
A work vehicle characterized by the above.

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