JP6022382B2 - Cover mounting structure for work vehicles - Google Patents

Description

  The present invention relates to a cover mounting structure in a work vehicle provided with a cover that is disposed on a lower side of a bonnet that covers a driving portion and is detachably attached to a traveling machine body.

  An example of the cover mounting structure in such a work vehicle is described in Patent Document 1, for example. In the cover mounting structure of Patent Document 1, two mounting holes are provided at the lower end portion of the cover, horizontal plates are provided at two upper and lower positions inside the cover, and a latch corresponding to the mounting hole is provided at the lower part on the traveling machine body side. A piece is provided, and an engagement / disengagement mechanism for engaging / disengaging the horizontal plate is provided on the traveling machine body side.

  In the above structure, in order to attach the cover to the traveling machine body side, first, the cover is inclined in the lateral direction of the machine body, and the attachment hole of the cover is engaged with the locking piece. Next, while maintaining the state in which the mounting hole is engaged with the locking piece, the cover is swung upright with the mounting hole as a fulcrum so that the upper end of the cover is raised toward the traveling machine, and the cover is leveled. Engage the plate with the disengagement mechanism. Thereby, a cover can be attached to the traveling machine body side.

JP 2004-122877 A (in particular, FIG. 4)

  However, in the technique described in Patent Document 1, when the cover is attached to the traveling machine body side, the horizontal plate is engaged and disengaged by swinging the cover while maintaining the state in which the attachment hole and the engagement piece are engaged. The mechanism is engaged. Therefore, since it is necessary to allow the cover to swing in a state in which the attachment hole and the engagement piece are engaged, the attachment hole has a size larger than that of the engagement piece. Therefore, when the cover is swung and the horizontal plate is engaged with the engagement / disengagement mechanism, the cover is likely to be displaced, and its position needs to be adjusted, and it takes time to install the cover.

  In view of the above circumstances, an object of the present invention is to provide a cover mounting structure in a work vehicle that can easily mount a cover to the traveling machine body side.

The first feature of the present invention is provided with a cover that is disposed on the lower side of the bonnet that covers the driving portion, and is detachably attached to the traveling machine body.
The cover includes a main body extending in the longitudinal direction of the machine body, a first engagement portion disposed at a front end of the main body, a second engagement portion disposed at a rear end of the main body, A third engagement portion disposed at the lower end of the main body, and
The traveling machine body side includes a first engaged portion that engages with the first engaging portion, a second engaged portion that engages with the second engaging portion, and a third engaging portion. A third engaged portion to be engaged, and
The first engaging portion and the first engaged portion allow movement of the main body portion in the longitudinal direction of the body in the engaged state,
The second engaging portion and the second engaged portion allow movement of the main body portion in the longitudinal direction of the body in the engaged state,
The engagement position of the third engagement portion and the third engaged portion is such that the first engagement portion and the first engaged portion are in an engaged state, and the second engagement portion and the When the second engaged portion is in an engaged state, the main body portion is set within a range in which movement is permitted in the longitudinal direction of the aircraft,
The third engaging portion and the third engaged portion are in a point that restricts movement of the main body portion in the front-rear direction of the body in the engaged state.

  According to this configuration, first, for example, the first engaging portion disposed at the front end of the main body is engaged with the first engaged portion on the traveling machine body, and the main body is moved in the front-rear direction in the engaged state. And the second engagement portion disposed at the rear end portion of the main body portion can be engaged with the second engaged portion on the traveling machine body side. By setting the first engaging portion and the first engaged portion to the engaged state and the second engaging portion and the second engaged portion to the engaged state, the main body portion is regulated in the lateral direction of the body. Thus, the main body is allowed to move in the longitudinal direction of the machine body.

  And when the 1st engagement part and the 1st to-be-engaged part are made into an engagement state, and the 2nd engagement part and the 2nd to-be-engaged part are made into an engagement state, it arrange | positioned at the lower end part of the main-body part. Since the engagement position of the third engagement portion and the third engaged portion on the traveling aircraft side is set within a range in which the main body portion is allowed to move in the front-rear direction of the vehicle body, It is possible to move to the position where the third engaging portion and the third engaged portion engage with each other by moving in the longitudinal direction of the machine body.

  Next, in addition to bringing the first engagement portion and the first engaged portion into the engaged state and bringing the second engagement portion and the second engaged portion into the engaged state, the third engagement By moving the part and the third engaged part into the engaged state, the movement of the main body part in the longitudinal direction of the machine body is restricted, and the cover is positioned with respect to the traveling machine body side. Thus, since the cover can be positioned by a simple operation, the cover can be easily attached to the traveling machine body side.

  The second feature of the present invention is that the amount of movement of the main body in the longitudinal direction of the main body in the engaged state of the first engaging portion and the first engaged portion, the second engaging portion, The movement allowance amount of the main body portion in the longitudinal direction of the machine body in the engaged state with the second engaged portion is different.

  According to this configuration, the cover is brought into a state where the engagement state between the first engagement portion and the first engaged portion and the engagement state between the second engagement portion and the first engaged portion are compatible. The state can be changed easily. For example, the allowable movement amount of the main body in the front-rear direction of the body in the engaged state between the first engaging portion and the first engaged portion is the relationship between the second engaging portion and the second engaged portion. If the main body portion in the combined state is larger than the allowable movement amount in the longitudinal direction of the machine body, the first engaging portion is first engaged with the first engaged portion, and the second engaging portion is moved to the second engaged portion. It becomes easy to engage with the engaging portion.

  On the contrary, the movement allowable amount of the main body in the front-rear direction of the main body in the engaged state between the second engaging portion and the second engaged portion is greater between the first engaging portion and the first engaged portion. When the main body portion in the engaged state is larger than the allowable movement amount in the longitudinal direction of the machine body, when the second engaging portion is first engaged with the second engaged portion, the first engaging portion is changed to the first engaging portion. It becomes easy to engage with the engaged portion.

  In addition, since the allowable amount of movement in the longitudinal direction of the body does not increase more than necessary, the configuration can be simplified.

According to a third aspect of the present invention, the first engaging portion includes a first protruding portion that protrudes from the main body portion along the front side of the body.
The second engagement portion is composed of a second protrusion protruding along the rear side of the body from the main body,
The first engaged portion is composed of a first insertion hole through which the first protrusion is inserted along the longitudinal direction of the body.
Said 2nd to-be-engaged part exists in the point which consists of a 2nd penetration hole which penetrates said 2nd protrusion part along the body front-back direction.

  According to this configuration, the first protrusion protruding from the main body along the front side of the body is inserted into the first insertion hole along the front-rear direction of the body and protruded along the rear side of the body from the main body. By inserting the second projecting portion into the second insertion hole along the longitudinal direction of the body, the movement in the longitudinal direction of the body is permitted while restricting the movement of the main body in the lateral direction of the body. As described above, a state in which the movement of the main body portion is allowed in the front-rear direction can be created by the protrusion and the insertion hole, and the cover mounting structure having a simple structure can be obtained.

  In addition, since the first engaging portion and the second engaging portion can be configured from the protrusions, and the first engaged portion and the second engaged portion can be configured from the insertion holes, the engaging portion and the engaged portion The configuration itself can be simplified.

  The fourth feature of the present invention resides in that the main body portion has a wide portion on the front side and a narrow portion on the rear side, and the third engaging portion is disposed in the wide portion.

  According to this configuration, since the main body has the front wide portion and the rear narrow portion, the center of gravity of the main body is biased toward the wide portion and is disposed at the lower end of the main body. The third engaging portion is disposed at a wide portion close to the center of gravity. For this reason, in order to engage the third engagement portion with the third engaged portion, it becomes easier to move the main body portion in the longitudinal direction of the machine body, and in addition, the third engagement portion becomes the third engaged portion. When engaged, the main body can be stably supported by the third engaged portion.

  The fifth feature of the present invention resides in that the cover is arranged so as to cover the lateral side of the exhaust pipe connected to the engine of the prime mover.

  According to this configuration, the cover is disposed so as to cover the fuselage lateral outer side of the exhaust pipe connected to the engine of the prime mover, that is, disposed at a position that is somewhat susceptible to heat. However, the first engaging portion and the first engaged portion are allowed to move the main body portion in the longitudinal direction of the body in the engaged state, and the second engaging portion and the second engaged portion The part is configured to allow movement of the main body part in the longitudinal direction of the machine body in the engaged state. For this reason, even if the cover is slightly deformed due to the heat of the exhaust pipe, for example, the first engagement portion and the first engaged portion, and the second engagement portion and the second engaged portion are respectively in the body. Since there is flexibility in the front-rear direction, the cover can be removed from the traveling machine body without any trouble.

  The sixth feature of the present invention resides in that the first engaged portion is formed in an accompanying part of the engine of the driving portion.

  According to this configuration, the first engaged portion on the traveling machine body side can be formed by using an accessory part of the engine of the driving part, for example, a fan shroud, so that existing parts can be used effectively and the cover mounting structure is inexpensive. Can be produced.

1 is an overall side view of a work vehicle. It is a side view which shows the front part of a working vehicle. It is a top view which shows the front part of a work vehicle. It is a side view which shows a part of cover attachment structure and a cover. It is a top view which shows a part of cover attachment structure and a cover. It is a perspective view which shows the vicinity of a 1st to-be-engaged part. It is a side view which shows the vicinity of a 2nd to-be-engaged part. It is a side view which shows the vicinity of a 3rd engaging part and a 3rd to-be-engaged part. It is a perspective view which shows the vicinity of a fixing | fixed part. It is explanatory drawing explaining the attachment method of a cover, (A) is the time of engaging the 1st to-be-engaged part with respect to a 1st engaging part, (B) is the 2nd to-be-engaged part with respect to a 2nd engaging part. When engaged, (C) shows when the third engaged portion is engaged with the third engaging portion, and (D) shows when the fixed portion is engaged with the fixed portion. It is a perspective view which shows the time of removal of the obstruction board in the obstruction structure of a fan shroud. It is a perspective view which shows the time of attachment of the obstruction board in the obstruction structure of a fan shroud. It is a perspective view which shows the vicinity of an exhaust pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Schematic configuration of tractor]
As shown in FIGS. 1 to 3, the tractor 11 (an example of a “work vehicle”) includes a traveling body 14 by a pair of left and right steering operations and a front wheel 12 that can be driven and a pair of left and right driveable rear wheels 13. It is configured as a four-wheel drive type that can run on its own. At the front of the traveling machine body 14, there are a driving part 15, a bonnet 16 that covers the driving part 15, a cover 17 positioned below the hood 16, and a cover that allows the cover 17 to be detachably attached to the traveling machine body 14 side. And an attachment structure 18. As shown in FIG. 1, a driving control unit 19 is provided behind the driving unit 15 in the traveling machine body 14, and the driving control unit 19 includes a steering wheel 20 and a driving located behind the steering wheel 20. A seat 21 and a driving panel 22 located in the vicinity of the steering wheel 20 are provided. A PTO shaft 23 and a link mechanism 24 are provided behind the driving control unit 19 in the traveling machine body 14. The tractor 11 is connected to a rear portion of the traveling machine body 14 by a link mechanism 24 so that a working device such as a rotary tiller (not shown) can be moved up and down, and by transmitting power from the PTO shaft 23 to the working device. It is possible to configure a riding-type working machine that performs the various operations described above.

  As shown in FIGS. 2 and 3, the prime mover 15 includes an engine 26, a fuel tank 27, an air cleaner 28, an exhaust treatment device 29, an exhaust pipe 30, a fan 31, a radiator 32, and a battery 33. And are provided. The engine 26 is composed of a diesel engine, and is supported on a front axle frame 34 at the front portion of the traveling machine body 14. The fuel tank 27 is located on the side and rear of the engine 26. The air cleaner 28 is located in front of the engine 26 and is connected to the intake side of the engine 26 via an inlet hose 36. The exhaust treatment device 29 is a device that removes exhaust particulates contained in the exhaust of the engine 26, is connected to the exhaust side of the engine 26, and is supported on the upper portion of the engine 26 via a device support frame 37. The exhaust treatment device 29 filters the exhaust particulates contained in the exhaust of the engine 26 with an internal filter (not shown) and burns the exhaust particulates accumulated in the filter, so that the exhaust treatment device 29 generates high-temperature exhaust. Discharged. The exhaust pipe 30 is connected to the exhaust treatment device 29, extends to the lateral outer side of the body, and exhausts exhaust from the engine 26 to the outside of the body. The fan 31 is located in front of the engine 26 and is supported by a fan shroud 38 (an example of an “engine accessory”). The radiator 32 is located in front of the engine 26 and is supported on the front axle frame 34.

  The bonnet 16 is configured to be swingable up and down around a horizontal axis P passing through a pair of left and right supports 39 provided to the front side of the partition frame 35, and has a closed posture covering the driving unit 15; It is configured to be freely switchable to an open posture in which the driving unit 15 is exposed to the outside. As shown in FIG. 1, when the bonnet 16 is closed, the bonnet 16 includes a front part 16 </ b> A located on the front side of the driving part 15, an upper part 16 </ b> B located on the upper side of the driving part 15, and the driving part 15. 16C of side parts located in the side of this. As shown in FIG. 2, the front portion 16 </ b> A is formed with a take-in portion 40 that takes air into the front space FR. As can be understood from FIGS. 1 and 2, the side portion 16 </ b> C is formed in a shape that opens to the outside without shielding the lower side of the engine room R, and the engine 26 and the exhaust in the prime mover 15. Heat generated in the processing device 29 can be efficiently exhausted from the side of the bonnet 16 to the outside of the machine body. A cover 17 is disposed at the lower edge of the rear part of the side part 16C of the bonnet 16, and the side part 16C forms substantially the same surface as the cover 17 at the time of attachment.

  As shown in FIGS. 2 and 3, when the hood 16 is closed, the fan shroud 38 includes an engine room ER in which the engine 26 is disposed and a front space located in front of the engine room ER. The structure is divided into FRs. Moreover, the partition frame 35 is configured to partition into an engine room ER and a rear space RR located behind the engine room ER. The inlet hose 36 is inserted in the upper part of the fan shroud 38 through the fan shroud 38 across the front space FR and the engine room ER along the longitudinal direction of the fuselage. The fan shroud 38 is provided with a closing structure 44 that closes the space between the front space FR and the engine room ER by preventing a gap between the inlet hose 36 and the fan shroud 38.

[Cover and cover mounting structure]
As shown in FIGS. 1 and 2, a detachable cover 17 is disposed on the traveling machine body 14 side at the lower edge of the rear portion of the side portion 16 </ b> C of the bonnet 16. The covers 17 are respectively arranged on the left and right of the traveling machine body 14. The cover 17 is made of, for example, resin, and is configured to be detachable from the traveling machine body 14 side by a cover mounting structure 18. As shown in FIGS. 4 and 5, the cover 17 is provided with a main body 42 formed so as to become narrower from the front side of the body toward the rear side of the body. The main body portion 42 is disposed along the lower edge portion of the rear portion of the side portion 16 </ b> C of the bonnet 16 when the cover 17 is attached, and covers the side of the driving portion 15. The main body 42 has a front wide portion 42A and a narrow portion 42B that is narrower in the vertical direction than the wide portion 42A on the rear side of the wide portion 42A. Further, in the main body 42, a peripheral portion surrounding the periphery of the ventilation portion 43 is formed in a rib shape facing the inside of the machine body for reinforcement.

  Further, in the main body portion 42, a ventilation portion 43 having a large number of ventilation holes is formed at two locations on the front and rear sides in order to discharge the heat of the driving portion 15 to the outside of the machine body. For example, the air taken in by the action of the fan 31 or the like from the take-in portion 40 in the front portion 16 </ b> A of the bonnet 16 cools the prime mover 15 and is then discharged from the vent portion 43 of the cover 17.

  The cover mounting structure 18 includes a first protrusion 45 on the cover 17 side (an example of a “first engagement portion”) and a first insertion hole 46 on the traveling machine body 14 side (an example of a “first engaged portion”). ), A second protrusion 47 on the cover 17 side (an example of a “second engaging portion”), a second insertion hole 48 on the traveling machine body 14 side (an example of a “second engaged portion”), and a cover A 17-side downward projecting portion 49 (an example of a “third engaging portion”) and a positioning hole 50 (an example of a “third engaged portion”) on the traveling machine body 14 side are provided.

  As shown in FIGS. 2 to 5, the first protrusion 45 is disposed at the front end of the main body 42 of the cover 17. The first protrusion 45 has an inwardly extending portion 45A that extends obliquely inward and forward from the front edge of the main body 42, and is narrower in the vertical direction than the inwardly extending portion 45A. A front extending portion 45B extending forward from the front end of the side extending portion 45A. The front extension 45 </ b> B is disposed on the inner side of the machine body relative to the second protrusion 47.

  The second protrusion 47 is disposed at the rear end of the main body 42 of the cover 17. The length in the front-rear direction of the second protrusion 47 is set to be shorter than the length in the front-rear direction of the front extension 45 </ b> B in the first protrusion 45. Further, the second protrusion 47 is located at substantially the same height as the first protrusion 45.

  The downward projecting portion 49 is formed so as to project from the lower edge portion of the main body portion 42 of the cover 17 along the lower side of the machine body. The downward projecting portion 49 has a large diameter portion 49A extending downward from the main body portion 42, a small diameter portion 49B formed to have a smaller diameter than the large diameter portion 49A extending downward from the large diameter portion 49A, and Is provided.

  As shown in FIGS. 6 and 10, the first insertion hole 46 is formed in the plate part which is the front side of the horizontal shunt 38 and the other side end of the fan shroud 38 on the traveling machine body 14 side, respectively. The first protrusion 45 can be inserted along the direction. Further, as shown in FIGS. 7 and 10, the second insertion holes 48 are formed at the horizontal one and the other lateral ends of the lower part of the partition frame 35 on the traveling machine body 14 side, and the second insertion holes 48 are formed along the longitudinal direction of the machine body. The protrusion 47 can be inserted.

  As shown in FIGS. 8 and 10, the positioning hole 50 is provided in a stay 56 erected from the front axle frame 34 on the traveling machine body 14 side. The stay 56 is located behind the lower end portion of the fan shroud 38. The positioning hole 50 is formed so as to penetrate the horizontal portion of the stay 56 up and down, and is configured to be able to engage with the downward projecting portion 49.

  As shown in FIG. 10, when the front extension 45 </ b> B of the first protrusion 45 is inserted and engaged with the first insertion hole 46, the front extension 45 </ b> B of the first protrusion 45 is caused by the first insertion hole 46. The movement in the horizontal direction of the machine body is restricted, and the movement of the front extension part 45B of the first protrusion 45 in the longitudinal direction of the machine body is allowed. In other words, the front extension 45B and the first insertion hole 46 of the first protrusion 45 are configured to allow movement of the main body 42 in the front-rear direction of the body in the engaged state. When the first protrusion 45 is inserted into the first insertion hole 46 to the position where the inwardly extending portion 45 </ b> A contacts the rear end of the first insertion hole 46, the gap between the second protrusion 47 and the second insertion hole 48 is reached. Therefore, the main body 42 is swung horizontally or vertically around the engagement portion between the first protrusion 45 and the first insertion hole 46, so that the second protrusion 47 and the first gap The two insertion holes 48 are aligned.

  Then, when the second protrusion 47 is inserted into the second insertion hole 48 and engaged while the first protrusion 45 is engaged with the first insertion hole 46, the second insertion hole 48 causes the second protrusion 47. The movement in the lateral direction of the machine body is restricted, and the movement of the second protrusion 47 in the longitudinal direction of the machine body is allowed. In other words, the second protrusion 47 and the second insertion hole 48 are configured to allow movement of the main body 42 in the front-rear direction of the machine body in the engaged state. As described above, when the first protrusion 45 is engaged with the first insertion hole 46 and the second protrusion 47 is engaged with the second insertion hole 48, the main body 42 is in the lateral direction of the body. The movement is restricted and guided by the first insertion hole 46 and the second insertion hole 48 so that the movement can be performed in the longitudinal direction of the machine body. With the first protrusion 45 engaged with the first insertion hole 46 and with the second protrusion 47 engaged with the second insertion hole 48, the main body 42 is connected to the first insertion hole 46 and the first insertion hole 46. The positioning hole 50 is aligned with the downward projecting portion 49 by moving in the longitudinal direction of the machine while being lifted upward within a range where flexibility in the two insertion holes 48 can be achieved.

  Here, as shown in FIGS. 2 to 5, 6, and 7, when the first protrusion 45 and the first insertion hole 46 are engaged with each other, The amount of movement of the main body 42 in the front-rear direction of the machine body in the engaged state between the two protrusions 47 and the second insertion hole 48 is different. Specifically, the length of the first protrusion 45 in the longitudinal direction of the body is formed so as to be longer than the length of the second protrusion 47 in the longitudinal direction of the body. As a result, the mounting procedure of first inserting the first protrusion 45 into the first insertion hole 46 and engaging it, and then inserting the second protrusion 47 into the second insertion hole 48 and engaging it is clear. In addition, the second protrusion 47 can be easily inserted and engaged with the second insertion hole 48 while the state where the first protrusion 45 is engaged with the first insertion hole 46 is maintained.

  Then, with the first protrusion 45 engaged with the first insertion hole 46 and the second protrusion 47 inserted through the second insertion hole 48 and engaged, the main body 42 is lowered downward. When the downward protrusion 49 is inserted into the positioning hole 50 and engaged, the movement of the downward protrusion 49 in the front-rear and left-right directions is restricted. Thereby, the movement of the main body portion 42 in the front-rear direction, the left-right direction, and the lower direction is restricted, and the cover 17 is positioned by its own weight. At this time, the engaging position of the downward projecting portion 49 and the positioning hole 50 is such that the first projecting portion 45 and the first insertion hole 46 are engaged, and the second projecting portion 47 and the second insertion hole 48 are engaged. When in the state, the main body 42 is set within a range in which movement is permitted in the longitudinal direction of the body.

  Further, as shown in FIGS. 6 and 10, the first insertion hole 46 has a long hole shape whose longitudinal direction is the vertical direction of the machine body, and the first protrusion 45 is more than the first insertion hole 46. The dimensions are small in the vertical direction. Therefore, when the first insertion hole 46 is engaged with the first protrusion 45, a gap in the vertical direction of the machine body is formed between the first protrusion 45 and the first insertion hole 46. Further, as shown in FIGS. 7 and 10, the second insertion hole 48 has a long hole shape in which the longitudinal direction of the machine body is the longitudinal direction, and the second projection 47 is more than the second insertion hole 48. The dimensions are small in the vertical direction. Therefore, when the second insertion hole 48 is engaged with the second protrusion 47, a gap in the vertical direction of the machine body is formed between the second protrusion 47 and the second insertion hole 48. Therefore, in the state where the first protrusion 45 is engaged with the first insertion hole 46 and the second protrusion 47 is engaged with the second insertion hole 48, the main body 42 of the cover 17 is in the vertical direction of the body. The flexibility of vibration can be secured.

  With the above configuration, the cover 17 can be positioned on the traveling machine body 14 side. However, as shown in FIGS. 2, 4, 5, 9, and 10, the cover mounting structure 18, the fixing portion 51, and the fixed portion Part 52 may be provided. The fixing portion 51 is disposed at a position near the center of the main body portion 42 in the front-rear direction of the machine body, and has a horizontal flat plate protruding inward from the inner surface side of the front ventilation portion 43, and an up-down direction formed on the flat plate. It has a hole. The fixed portion 52 is configured by a vertically oriented hole formed on a bracket 55 that protrudes from the device support frame 37 that supports the exhaust treatment device 29 above the engine 26 toward the outside of the machine body.

Hereinafter, how to attach the cover 17 to the traveling machine body 14 side will be described.
First, as shown in FIG. 10A, the main body 42 is moved forward of the machine body, and the front extension 45B of the first protrusion 45 is inserted through the first insertion hole 46 and engaged therewith. At this time, the front extension 45 </ b> B of the first protrusion 45 is inserted into the first insertion hole 46 while slightly lifting the main body 42. When the first protrusion 45 is inserted into the first insertion hole 46 until the rear end of the first insertion hole 46 contacts the front end of the inwardly extending part 45A of the first protrusion 45, the second protrusion A clearance in the longitudinal direction of the fuselage is formed between 47 and the second insertion hole 48. At this time, the first insertion hole 46 is disposed on the inner side of the machine body relative to the second insertion hole 48, and the front extension part 45 </ b> B of the first protrusion 45 is positioned on the inner side of the machine body relative to the second protrusion 47. Are arranged to be. For this reason, the first protrusion 45 is easily inserted into the first insertion hole 46 and engaged.

  Next, as shown in FIG. 10B, with the first protrusion 45 inserted through the first insertion hole 46, the main body 42 is slightly slid to the rear side of the machine body to move the second protrusion 47 to the first position. The two insertion holes 48 are inserted and engaged. As described above, when the first protrusion 45 is engaged with the first insertion hole 46 and the second protrusion 47 is engaged with the second insertion hole 48, the main body 42 is in the lateral direction of the body. In a state where movement is restricted and there is flexibility in the vertical direction of the aircraft, movement in the longitudinal direction of the aircraft is allowed. As a result, the main body portion 42 of the cover 17 is positioned with respect to the traveling aircraft body 14 in the lateral direction of the aircraft body.

  Then, as shown in FIG. 10C, the main body 42 is slightly opened while the first protrusion 45 is inserted into the first insertion hole 46 and the second protrusion 47 is inserted into the second insertion hole 48. It is lifted and slid in the longitudinal direction of the machine, the lower projection 49 is aligned with the positioning hole 50, the main body 42 is moved downward, and the lower projection 49 is inserted into the positioning hole 50 to be inserted. Engage. As a result, the movement of the main body portion 42 of the cover 17 in the longitudinal direction and the downward direction of the body is restricted.

  In this state, as shown in FIGS. 1 and 2, when the bonnet 16 is closed, the lower edge of the side portion 16C of the bonnet 16 restricts the movement of the main body 42 of the cover 17 in the upward direction of the machine body. The As a result, the main body 42 is restricted in the lateral direction of the body, the longitudinal direction of the body, and the vertical direction of the body, and the cover 17 can be prevented from falling off from the traveling body 14 side as long as the bonnet 16 is in the closed posture.

  When the cover 17 is attached to the traveling machine body 14 by the cover mounting structure 18 as described above, between the first protrusion 45 and the first insertion hole 46 and between the second protrusion 47 and the second insertion hole 48, It is possible to ensure flexibility in the longitudinal direction and lateral direction of the aircraft. For this reason, when the traveling machine body 14 vibrates up and down due to traveling or the like, there is a slight amount between the first protrusion 45 and the first insertion hole 46 and between the second protrusion 47 and the second insertion hole 48. Can be secured in the vertical direction.

  When the downward projecting portion 49 is engaged with the positioning hole 50, the fixing portion 51 is positioned at the position of the fixed portion 52 as shown in FIG. The main body portion 42 of the cover 17 is completely fixed to the traveling machine body 14 side by, for example, fastening the fastening member such as the knob bolt 57 from the upper side to engage and fix the fixing portion 51 to the fixed portion 52. Can do.

[Blockage structure]
As shown in FIGS. 11 and 12, the closing structure 44 includes an insertion portion 60 on the fan shroud 38 side, and a closing plate 61 engaged with the insertion portion 60 from above the insertion portion 60. The insertion portion 60 has a shape that follows the shape of the lower half of the inlet hose 36. Specifically, when the inlet hose 36 is formed in a circular cross section, the insertion portion 60 is formed in a semicircular shape that receives the lower semicircular portion of the inlet hose 36. The insertion part 60 includes a support part 60A, a lower restriction part 60B, a middle restriction part 60C, and an upper restriction part 60D. The lower restricting portion 60B, the middle restricting portion 60C, and the upper restricting portion 60D are alternately arranged in the front and rear side by side in the vertical direction, and the closing plate 61 is interposed between the lower restricting portion 60B and the upper restricting portion 60D and the middle restricting portion 60C. Is configured to be freely inserted.

  The support portion 60A receives and supports the engaged blocking plate 61 from below. The lower restricting portion 60B is disposed adjacent to the upper portion of the support portion 60A, and is configured to restrict the forward movement of the lateral end portions of the upper front surface of the closing plate 61. The middle restricting portion 60C is disposed adjacent to the upper portion of the lower restricting portion 60B, and is configured to restrict the rearward movement of the lateral end portions of the rear surface of the upper and lower central portions of the closing plate 61. The upper restricting portion 60D is disposed adjacent to the upper portion of the middle restricting portion 60C, restricts the rearward movement of both lateral end portions of the upper front surface of the closing plate 61, and extends upward from the convex portion 61B of the closing plate 61. It is configured to restrict movement. Thus, the insertion part 60 prevents the closing plate 61 from moving in the front-rear direction by alternately sandwiching the closing plate 61 in the front-rear direction.

  The closing plate 61 is made of a flexible resin member, for example. The blocking plate 61 includes a flat plate portion 61A and convex portions 61B formed at both lateral ends of the flat plate portion 61A. The flat plate portion 61 </ b> A is formed by cutting out a rectangular lower end portion into an upper semicircular shape along the outer shape of the upper portion of the inlet hose 36. The convex portion 61B is fixed to the flat plate portion 61A and is provided so as to protrude in the front-rear direction of the body from the shielding surface of the flat plate portion 61A.

  In order to attach the blocking plate 61 to the insertion portion 60, the flat plate portion 61A is bent and the convex portion 61B is positioned below the upper restricting portion 60D, and then is brought into a free state. Thereby, the closing plate 61 is restricted from moving in the front / rear, up / down, left / right directions by the insertion portion 60, and can completely partition the engine room ER and the front space FR. As described above, when the convex portion 61B is brought into contact with the upper restricting portion 60D, the blocking plate 61 is prevented from coming off and vibration is prevented. This eliminates the need for a process of filling the gap between the fan shroud 38 and the inlet hose 36 using a sponge or the like as in the prior art, and has a simple structure and allows partitioning between the engine room ER and the front space FR. Can be increased.

[Specific structure of exhaust pipe]
As shown in FIGS. 2 and 13, the exhaust pipe 30 is provided with a first exhaust pipe 62 connected to the engine 26 side and a second exhaust pipe 63 connected to the first exhaust pipe 62. Yes. One end side of the first discharge pipe 62 is connected to the engine 26 side, extends downward from one end side to reach a bent portion, and is formed with the other end side extending from the bent portion to the front side of the oblique body. The cross-sectional area is reduced at the discharge port 62A of the first discharge pipe 62, thereby increasing the flow rate of the exhaust gas near the discharge port 62A and increasing the negative pressure near the discharge port 62A.

  The second discharge pipe 63 functions as a wind guide pipe that guides the exhaust discharged from the first discharge pipe 62, and is bolted to the side portion of the front axle frame 34 via a bracket 63E that extends in the longitudinal direction of the machine body. Is attached to form a cylindrical body having a rectangular shape as a whole. The second discharge pipe 63 includes a first upper opening 63A having a rear upper surface opened, a rear opening 63B having a rear opening, and a second upper opening having a front surface opened from the first upper opening 63A. A portion 63C and an exhaust port 63D having an open front surface are provided. It arrange | positions so that the exhaust_gas | exhaustion from 62A of 1st discharge pipes 62 may be discharged | emitted by 63 A of 1st upper opening parts.

  And the discharge port 62A is formed by restricting the cross-sectional area of the first discharge pipe 62, and since the flow velocity of the exhaust gas is increased, a large negative pressure can be generated around the discharge port 62A. The amount of air introduced from the periphery of the first upper opening 63A can be increased to effectively reduce the exhaust temperature. In addition, air can be introduced not only from the first upper opening 63A but also from the rear opening 63B, and the amount of air introduced can be increased. In this way, the cross-sectional area of the introduction port for introducing air in the second exhaust pipe 63 is increased to effectively reduce the exhaust temperature. Further, the upper opening 63A is formed at a portion continuously cut out above the rear opening 63B of the second exhaust pipe 63. Therefore, since the rear opening 63B and the upper opening 63A are continuous, there is no resistance that hinders the introduction of air between them, and air can be introduced smoothly.

  In addition, the second exhaust pipe 63 is provided in a slanting posture with a slanting front lowering, and the exhaust from the exhausting port 62A has a slanting front lowering in the inflow direction into the second exhausting pipe 63. Exhaust gas from 62A is introduced into the second exhaust pipe 63 without receiving resistance as much as possible, and the generation of a larger negative pressure is ensured. Furthermore, since the cross-sectional area of the exhaust port 63D is larger than the cross-sectional area of the air introduction port in the second exhaust pipe 63, the flow of the mixture of exhaust gas and air in the second exhaust pipe 63 is smooth. Thus, the air-fuel mixture whose exhaust temperature is lowered can be reliably exhausted to the outside. Further, since the exhaust port 63D is cut in the oblique lateral direction by the notch portion 63F, the exhaust from the exhaust port 63D is not concentrated and exhausted only in the front side, but in the oblique lateral direction. Will also be dispersed and exhausted.

  According to such an exhaust pipe 30, high-temperature exhaust is discharged from the exhaust treatment device 29 to the first discharge pipe 62, and the first upper opening 63 </ b> A of the second discharge pipe 63 is discharged from the discharge port 62 </ b> A of the first discharge pipe 62. Exhaust is blown into. Then, the vicinity of the discharge port 62A becomes negative pressure, and air outside the machine body flows into the second discharge pipe 63 from the rear opening 63B of the second discharge pipe 63, and the air that has flowed in blows from the first upper opening 63A. It is mixed with the exhausted gas, and the temperature of the exhaust gas can be lowered. Further, when the exhaust gas flows into the second exhaust pipe 63, the air outside the machine body flows into the second exhaust pipe 63 from the second upper opening 63C, and the air that flows in is mixed with the exhaust gas whose temperature has been reduced. The temperature can be further reduced. Thereby, the exhaust gas lowered to the temperature can be discharged outside the machine body.

[Another embodiment]
(1) In the above embodiment, the example in which the first protrusion 45 is formed longer than the second protrusion 47 is shown. On the contrary, the second protrusion 47 is more than the first protrusion 45. May be formed longer.

  (2) In the above embodiment, the first protrusion 45 as the first engagement part, the second protrusion 47 as the second engagement part, the downward projecting part 49 as the third engagement part, and the first engaged part The first insertion hole 46, the second insertion hole 48 as the second engaged portion, the positioning hole 50 as the third engaged portion, and the engagement method by the protrusion and the insertion hole are exemplified, but the present invention is not limited thereto. . For example, the first engaging portion, the second engaging portion, and the third engaging portion are hook-like members, and the first engaged portion, the second engaged portion, and the third engaged portion are hook-like members. The engagement method may be a hole-like member that can be hooked.

  (3) In the above embodiment, the example in which the fixed portion 51 and the fixed portion 52 are provided is shown. However, the cover 17 is moved upward by the lower end portion of the side portion 16C of the bonnet 16 in the closed posture. Since it is regulated, the fixing part 51 and the fixed part 52 may not be provided.

  (4) In the above-described embodiment, the fan shroud 38 is cited as an example of the accessory part of the engine 26 in the prime mover 15. However, the fan shroud 38 is not limited to this, and may be another accessory part such as an engine frame that supports the engine 26. May be.

  (5) In the said embodiment, although the tractor 11 was mentioned as an example of a working vehicle, it is not restricted to this, Other working vehicles, such as a combine and a rice transplanter, may be sufficient.

11: Tractor ("work vehicle")
14: traveling machine body 15: prime mover 16: bonnet 17: cover mounting structure 30: exhaust pipe 38: fan shroud ("engine accessory")
41: Cover 42: Body portion 42A: Wide portion 42B: Narrow portion 45: First protrusion ("first engagement portion")
46: First insertion hole ("first engaged portion")
47: Second protrusion ("second engaging portion")
48: Second insertion hole ("second engaged portion")
49: downward projecting portion ("third engaging portion")
50: Positioning hole ("third engaged portion")

Claims (6)

A cover that is disposed on the lower side of the bonnet that covers the prime mover and is detachably attached to the traveling machine body is provided.
The cover includes a main body extending in the longitudinal direction of the machine body, a first engagement portion disposed at a front end of the main body, a second engagement portion disposed at a rear end of the main body, A third engagement portion disposed at the lower end of the main body, and
The traveling machine body side includes a first engaged portion that engages with the first engaging portion, a second engaged portion that engages with the second engaging portion, and a third engaging portion. A third engaged portion to be engaged, and
The first engaging portion and the first engaged portion allow movement of the main body portion in the longitudinal direction of the body in the engaged state,
The second engaging portion and the second engaged portion allow movement of the main body portion in the longitudinal direction of the body in the engaged state,
The engagement position of the third engagement portion and the third engaged portion is such that the first engagement portion and the first engaged portion are in an engaged state, and the second engagement portion and the When the second engaged portion is in an engaged state, the main body portion is set within a range in which movement is permitted in the longitudinal direction of the aircraft,
The third engagement portion and the third engaged portion are a cover mounting structure in a work vehicle that restricts movement of the main body portion in the longitudinal direction of the machine body in the engaged state.   The amount of movement of the main body in the front-rear direction of the body in the engaged state between the first engaging portion and the first engaged portion, and the second engaging portion and the second engaged portion The cover mounting structure for a work vehicle according to claim 1, wherein an allowable movement amount of the main body portion in the front-rear direction of the machine body is different in the engaged state. The first engagement portion is composed of a first protrusion protruding along the front side of the body from the main body,
The second engagement portion is composed of a second protrusion protruding along the rear side of the body from the main body,
The first engaged portion is composed of a first insertion hole through which the first protrusion is inserted along the longitudinal direction of the body.
3. The cover mounting structure for a work vehicle according to claim 1, wherein the second engaged portion includes a second insertion hole through which the second protrusion is inserted along the longitudinal direction of the machine body.   The said main-body part has a wide site | part on the front side, and a narrow site | part on the back side, The said 3rd engaging part is arrange | positioned at the said wide site | part. Cover mounting structure for work vehicles.   5. The cover mounting structure for a work vehicle according to claim 1, wherein the cover is disposed so as to cover an airframe lateral outer side of an exhaust pipe connected to an engine of the driving unit. 6.   The cover attachment structure for a work vehicle according to any one of claims 1 to 5, wherein the first engaged portion is formed in an accompanying part of the engine of the driving portion.

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