JP6362572B2 - Tractor muffler - Google Patents

Description

  The present invention relates to a tractor muffler technology.

  Conventionally, tractor muffler technology is known. For example, as described in Patent Document 1.

  Patent Document 1 discloses a prime mover disposed at the front portion of a machine frame, a driving operation unit disposed at the rear of the prime mover, and a front loader disposed detachably with respect to the aircraft frame in front of the fuselage frame. Is disclosed. Moreover, in the tractor described in Patent Document 1, a muffler that exhausts exhaust gas upward is provided on the front side of the operation operation unit.

  Conventionally, a muffler that exhausts exhaust gas downward in a tractor is known. However, in the tractor described in Patent Document 1, if the muffler is extended downward in order to exhaust the exhaust gas downward, the muffler may interfere with the front loader. Further, if the muffler is prevented from interfering with the front loader, the size of the tractor may increase.

JP 2001-164593 A

  The present invention has been made in view of the above situation, and a problem to be solved is to prevent the front loader from interfering with the tractor when mounted on the vehicle body. A tractor muffler capable of suppressing an increase in the size of the tractor is provided.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, according to the first aspect of the present invention, the muffler of the tractor can be attached to the vehicle body as a separate body from the front loader, and is arranged so as to extend substantially in the vertical direction at the side portion of the vehicle body. Further, a bent portion whose lower side is bent forward with respect to the upper side is formed, and a portion located below the bent portion is a part of the front loader that is mounted on the vehicle body in a side view. The first frame fixed to the vehicle body and the second frame disposed outside the first frame are disposed so as to pass through the front of the first coupling portion, and are positioned above the bent portion. In the side view, the portion to be mounted is arranged so as to pass behind the second connecting portion provided on the second frame and connected to the boom, of the front loader mounted on the vehicle body. It is intended to be.

  According to a second aspect of the present invention, the dividing portion located above the bent portion is formed so as to be divided vertically.

  According to a third aspect of the present invention, the dividing portion is disposed at a position that does not overlap with the front loader mounted on the vehicle body in a side view.

  According to a fourth aspect of the present invention, the inner diameter of the portion located below the dividing portion is formed to be larger than the inner diameter of the portion located above the dividing portion.

  According to a fifth aspect of the present invention, a lower bent portion whose lower side is bent downward with respect to the upper side is formed in a portion located below the bent portion.

  According to the sixth aspect of the present invention, the upper end portion is connected to the SCR disposed at the upper portion of the engine.

  In the seventh aspect, the lower end portion is opened below the vehicle body frame.

  As effects of the present invention, the following effects can be obtained.

In Claim 1, when it mounts with respect to a vehicle body, it can prevent interfering with a front loader, and can suppress that the size of a tractor increases.
That is, it is possible to prevent the muffler from interfering with the first connection portion and the second connection portion when the muffler is attached to the vehicle body. Further, even if the muffler is disposed between the first frame and the second frame in a front view (rear view), the front loader does not interfere with the tractor so that the size of the tractor in the left-right width direction is prevented from increasing. be able to.

According to the second aspect, the front loader can be easily mounted on the vehicle body while being mounted on the vehicle body.
That is, the muffler can be easily attached to the vehicle body by assembling the divided mufflers in order.

According to the third aspect, the front loader can be more easily attached to the vehicle body while being attached to the vehicle body.
That is, when attaching the muffler to the vehicle body, it becomes easy to visually recognize the divided portion from the side, so that the portion located above the divided portion of the muffler and the portion located below can be easily connected. .

According to the fourth aspect, the exhaust gas can be easily discharged.
That is, it is possible to reduce the resistance of the exhaust gas in the portion located below the divided portion, and to easily exhaust the exhaust gas to the outside. Further, the flow rate of the exhaust gas in the portion located above the dividing portion can be increased, and as a result, the backflow of the exhaust gas can be suppressed.

According to the fifth aspect, the exhaust gas can be guided downward.
That is, the exhaust gas can be guided downward along the portion located below the lower bent portion, and as a result, the exhaust gas can be discharged to the outside further downward.

  According to the sixth aspect of the present invention, exhaust gas with reduced nitrogen oxides can be discharged to the outside.

In Claim 7, it can suppress that exhaust gas reaches a driver | operator.
That is, the exhaust gas can be discharged below the vehicle body frame, and as a result, the exhaust gas can hardly flow to the driver.

The side view of the tractor provided with the muffler concerning one embodiment of the present invention. Similarly, a partial side view. Similarly, a partial rear view. The perspective view from the front upper part of a muffler.

  In the following, the directions indicated by arrow U, arrow D, arrow F, arrow B, arrow L and arrow R in the figure are defined as upward, downward, forward, backward, leftward and rightward, respectively. To explain.

  First, the whole structure of the vehicle body 1 of the tractor provided with the muffler 20 which concerns on one Embodiment of this invention is demonstrated using FIG.

  The tractor mainly includes a body frame 2, a front wheel 3, a transmission case 4, a rear wheel 5, an engine 6, an exhaust gas purification device 7, a hood 8, a cabin 9, a front loader 10, and a muffler 20.

  The body frame 2 is disposed at the front portion of the vehicle body 1 with its longitudinal direction facing the front-rear direction. The front part of the body frame 2 is supported by a pair of left and right front wheels 3 via a front axle mechanism (not shown). A transmission case 4 is fixed to the rear part of the body frame 2. The rear part of the transmission case 4 is supported by a pair of left and right rear wheels 5 via a rear axle mechanism (not shown). An engine 6 is provided in the middle part of the body frame 2 before and after. An exhaust gas purification device 7 is provided above the engine 6. The engine 6 and the exhaust gas purification device 7 are covered with a bonnet 8.

  The power of the engine 6 can be transmitted to the front wheel 3 through the front axle mechanism after being shifted by a transmission (not shown) housed in the transmission case 4 and the rear wheel 5 through the rear axle mechanism. It can be transmitted to. The front wheels 3 and the rear wheels 5 are rotationally driven by the power of the engine 6 so that the tractor can travel.

  The exhaust gas of the engine 6 is purified by the exhaust gas purification device 7. The exhaust gas purification device 7 mainly includes a DPF 7a and an SCR 7b. The DPF 7a and the SCR 7b are arranged side by side. The DPF 7a can collect PM in the exhaust gas of the engine 6. With the SCR 7b, nitrogen oxides in the exhaust gas of the engine 6 can be reduced. The SCR 7b is arranged with the exhaust port (not shown) of the SCR 7b facing rearward to the right.

  A cabin 9 is provided behind the engine 6. Inside the cabin 9, a living space in which the driver gets on is formed. In the living space, a steering wheel 9a for adjusting the turning angle of the front wheels 3 and 3, various operation tools (not shown), a seat (not shown) for a driver to sit, and the like are arranged.

  A front loader 10 is provided at the front portion of the vehicle body 1. By operating the front loader 10, it is possible to carry earth and sand.

  A muffler 20 is provided on the right side of the vehicle body 1. One end of the muffler 20 is connected to the exhaust port of the SCR 7 b, and the other end of the muffler 20 extends below the vehicle body 1. Thereby, the muffler 20 can exhaust the exhaust gas of the engine 6 to the lower side of the vehicle body 1.

  Next, a detailed configuration of the front loader 10 will be described with reference to FIGS. 1 to 4. In FIGS. 2 to 4, illustration of members is omitted as appropriate for the sake of clarity. For example, in FIG. 2, illustration of members located on the outer side in the left-right direction of the first connecting portion 113 is omitted. In FIG. 4, the second frame 112 and the boom 12 are not shown.

  The front loader 10 is used for carrying earth and sand. The front loader 10 is detachably disposed at the front portion of the vehicle body 1. The front loader 10 includes a main frame 11, a boom 12 and a bucket 13.

  The main frame 11 is a portion fixed to the left and right of the front portion of the vehicle body 1. The main frame 11 mainly includes a first frame 111, a second frame 112, a first connecting portion 113, and a second connecting portion 114. Since the left and right main frames 11 have substantially the same configuration, only the main frame 11 disposed on the right side of the vehicle body 1 will be described below, and the description of the main frame 11 disposed on the left side will be omitted.

  The first frame 111 is a part constituting the inner side of the main frame 11 in the left-right direction. The first frame 111 is formed in a substantially rectangular plate shape with the plate surface facing in the left-right direction. The first frame 111 is fixed to the right rear portion of the machine body frame 2 with the longitudinal direction thereof directed in the front-rear direction.

  The second frame 112 is a part constituting the outer side in the left-right direction of the main frame 11. The second frame 112 is formed in a plate shape extending in the vertical direction with the plate surface facing in the left-right direction. The second frame 112 is disposed outside the first frame 111 in the left-right direction. The lower part of the second frame 112 is disposed at a position overlapping the rear part of the first frame 111 in a side view. A support groove 112 a is formed in the second frame 112. The support groove 112 a is formed in the upper and lower middle part of the second frame 112. The support groove 112a is formed in a shape that is open upward (a U-shape in a side view).

  The first connecting portion 113 connects the first frame 111 and the second frame 112. The 1st connection part 113 is formed in the cylindrical shape which orient | assigned the axis line to the left-right direction. The first connecting portion 113 is disposed between the first frame 111 and the second frame 112 in the left-right direction. The first connecting part 113 is fitted into a hole formed in the rear part of the first frame 111 and a hole formed in the lower part of the second frame 112, thereby connecting the first frame 111 and the second frame 112. Link.

  The 2nd connection part 114 is a part connected with the boom 12 (connection frame 121) mentioned later. The second connecting portion 114 is formed on the upper portion of the second frame 112 (upper rear of the support groove 112a). The 2nd connection part 114 is formed in the cylindrical shape which orient | assigned the axis line to the left-right direction.

  The boom 12 is a part that connects the main frame 11 and a bucket 13 described later. The boom 12 includes a connection frame 121 and a boom body 122.

  The connection frame 121 is a part connected to the main frame 11. The connection frame 121 is mainly formed by two substantially rhombic plate-shaped members whose plate surfaces are directed in the left-right direction. The connection frame 121 is arranged at a position where the two substantially rectangular plate-like members sandwich the second frame 112 from the left and right sides in the rear view.

  A support shaft 121 a is provided at the lower portion of the connection frame 121. The support shaft 121a is arranged with the axis line directed in the left-right direction. The support shaft 121 a is placed in the support groove 112 a of the second frame 112. In this state, the connecting frame 121 is connected to the second connecting portion 114 by inserting the connecting member into the hole formed in the rear portion of the connecting frame 121 and the hole of the second connecting portion 114 (the inner peripheral side of the cylinder). Concatenated

  The boom main body 122 forms a main structure of the boom 12. The boom body 122 is formed so as to extend from the upper part of the connection frame 121 toward the front lower side. The rear end portion of the boom body 122 is supported on the upper portion of the connection frame 121 so as to be rotatable up and down with respect to the connection frame 121. A boom cylinder 122 a is connected to the boom body 122. The boom cylinder 122a is arranged in a state where the longitudinal direction is substantially in the front-rear direction. The rear end portion of the boom cylinder 122 a is connected to the front portion of the connection frame 121. The front end portion of the boom cylinder 122 a is connected to the midway portion in the front-rear direction of the boom body 122.

  The bucket 13 is a part for scooping earth and sand. A bucket cylinder 13 a is connected to the bucket 13. Bucket cylinder 13a is arranged in a state where the longitudinal direction is substantially directed to the front lower direction. A rear end portion of the bucket cylinder 13 a is connected to a midway portion in the front-rear direction of the boom body 122. The front end portion of the bucket cylinder 13 a is connected to the rear portion of the bucket 13.

  In the front loader 10 configured as described above, the boom main body 122 can be rotated up and down with respect to the connecting frame 121 by extending and contracting the boom cylinder 122a. Further, the bucket 13 can be rotated up and down with respect to the boom 12 by expanding and contracting the bucket cylinder 13a. Thereby, carrying work of earth and sand can be performed while rotating the boom main body 122 and the bucket 13 appropriately.

  Next, a detailed configuration of the muffler 20 will be described with reference to FIGS. In FIG. 2, the muffler cover 23 is illustrated by a two-dot chain line, and in FIG. 4, the illustration of the muffler cover 23 is omitted.

  The muffler 20 discharges the exhaust gas of the engine 6 to the outside. The muffler 20 is disposed on the right side of the vehicle body 1. The muffler 20 includes a small diameter pipe 21, a large diameter pipe 22, and a muffler cover 23.

  The small diameter pipe 21 is a part constituting the upper part of the muffler 20. The small diameter pipe 21 is formed in a tubular shape bent into a substantially L shape. The lower portion of the small-diameter pipe 21 is disposed so as to extend substantially downward (rear lower). The upper portion of the small-diameter pipe 21 is disposed so as to extend inward in the left-right direction (leftward). The upper end (opening) of the small-diameter pipe 21 can be fitted into the exhaust port of the SCR 7b accommodated in the bonnet 8 by moving the small-diameter pipe 21 left frontward, and is thereby connected to the SCR 7b. The Most of the small-diameter pipe 21 is disposed so as to be positioned between the connecting frame 121 and the second frame 112 and the cabin 9 in the front-rear direction. The lower end portion of the small-diameter pipe 21 is disposed so as to be positioned at substantially the same height as the second connecting portion 114. The overall length of the small diameter pipe 21 is formed to be shorter than the overall length of the large diameter pipe 22 described later.

  The large diameter pipe 22 is a part constituting the lower part of the muffler 20. The large diameter pipe 22 is formed in a tubular shape bent at a plurality of locations. The inner diameter of the large diameter pipe 22 is formed to be larger than the inner diameter of the small diameter pipe 21. The large-diameter pipe 22 includes an upper pipe 221, a middle pipe 222, and a lower pipe 223.

  The upper pipe 221 is a part constituting the upper part of the large-diameter pipe 22. The upper pipe 221 is disposed with its axis line oriented substantially in the vertical direction (rear and lower). The upper end portion of the upper pipe 221 is connected to the lower end portion of the small diameter pipe 21. A divided portion 221 a is formed between the upper end portion of the upper pipe 221 and the lower end portion of the small diameter pipe 21. In the division part 221a, the upper end part of the upper pipe 221 and the lower end part of the small-diameter pipe 21 are formed to be separable (detachable). The division part 221a is arrange | positioned in the position which does not overlap with the front loader 10 (especially the 2nd frame 112 and the connection frame 121) in side view (refer FIG. 2). In the dividing portion 221a, a gap is formed between the outer peripheral surface of the small diameter pipe 21 and the inner peripheral surface of the upper pipe 221 so that outside air can be taken into the muffler 20.

  The middle pipe 222 is a part constituting the middle part of the large-diameter pipe 22. The middle pipe 222 is formed continuously below the upper pipe 221 with the upper pipe 221. An upper bent portion 222 a is formed between the upper end portion of the middle pipe 222 and the lower end portion of the upper pipe 221. The lower side of the upper bent portion 222a (that is, the middle pipe 222) is formed to be bent forward with respect to the upper side of the upper bent portion 222a (that is, the upper pipe 221). The middle pipe 222 is disposed substantially parallel to a straight line (the rear lower surface of the connection frame 121) connecting the support groove 112a and the second connection part 114 in a side view.

  The lower pipe 223 is a part constituting the lower part of the large diameter pipe 22. The lower pipe 223 is formed in a tubular shape bent into an approximately L shape. The lower pipe 223 is continuously formed below the middle pipe 222 with the middle pipe 222. The upper part of the lower pipe 223 is arranged to extend downward. The lower part of the lower pipe 223 is disposed so as to extend inward in the left-right direction (leftward). A lower bent portion 223 a is formed between the upper end portion of the lower pipe 223 and the lower end portion of the middle pipe 222. The lower side of the lower bent part 223a (that is, the lower pipe 223) is formed to bend downward with respect to the upper side of the lower bent part 223a (that is, the middle pipe 222). The lower end portion of the lower pipe 223 is disposed so as to be opened leftward below the body frame 2 of the vehicle body 1.

  The muffler cover 23 covers the outer peripheral surfaces of the small diameter pipe 21 and the large diameter pipe 22. The muffler cover 23 includes an upper cover 231 and a lower cover 232.

  The upper cover 231 is a part constituting the upper part of the muffler cover 23. The upper cover 231 is substantially U-shaped in cross section and is formed so as to extend along the axial direction of the small diameter pipe 21. The upper cover 231 is disposed so as to cover the outer peripheral surface (portion excluding the inner side) of the small-diameter pipe 21 with the substantially U-shaped opening side facing inward (leftward).

  The lower cover 232 is a part constituting the lower part of the muffler cover 23. The lower cover 232 is substantially U-shaped in cross section and is formed so as to extend along the axial direction of the upper pipe 221 and the middle pipe 222. The lower cover 232 is formed to extend from the upper end portion of the upper pipe 221 to the middle portion of the middle pipe 222. The lower cover 232 is disposed so as to cover the entire upper pipe 221 and the outer peripheral surface (the portion excluding the inner side) of the upper part of the middle pipe 222 with the substantially U-shaped opening side facing inward (leftward). .

  In the muffler 20 configured as described above, as shown in FIG. 2, the portion below the upper bent portion 222a (that is, the middle pipe 222 and the lower pipe 223) is located in front of the first connecting portion 113 in a side view. Arranged to pass. On the other hand, the portion above the upper bent portion 222a (that is, the small-diameter pipe 21 and the upper pipe 221) passes behind the second connecting portion 114 (between the second connecting portion 114 and the cabin 9) in a side view. Placed in.

  By configuring the muffler 20 in this way, the muffler 20 is disposed so as to pass between the first frame 111 and the second frame 112 (and the connection frame 121) without interfering with the front loader 10. Further, since the muffler 20 is disposed so as to pass between the first frame 111 and the second frame 112, the front loader 10 and the muffler 20 can be connected together without increasing the width dimension of the vehicle body 1 in the left-right direction. It can be attached to the vehicle body 1. Moreover, the muffler 20 can shorten the length of the muffler 20 while being configured in this way while avoiding interference with the front loader 10.

  Moreover, the muffler 20 is formed so that it can be divided | segmented up and down in the division part 221a. Therefore, in order to attach the muffler 20 to the vehicle body 1, the small diameter pipe 21 may be connected to the exhaust port of the SCR 7 b and then the large diameter pipe 22 may be connected to the small diameter pipe 21. Thus, since the muffler 20 according to the present embodiment is easier to handle the muffler 20 than the case where the muffler 20 is integrally formed, the muffler 20 can be easily attached to the vehicle body 1 without contacting the front loader 10. Can be installed.

  Moreover, the division part 221a is arrange | positioned in the position which does not overlap with the front loader 10 in side view. Therefore, when attaching the muffler 20 to the vehicle body 1, the operator can easily see the divided portion 221 a from the side, and thus the small diameter pipe 21 and the large diameter pipe 22 can be easily connected.

  Moreover, since the small diameter pipe 21 and the upper pipe 221 are disposed so as to pass behind the second connecting portion 114 in a side view, a space on the right side of the engine 6 can be secured. Therefore, maintenance work such as replacement of the oil filter can be easily performed.

  Further, since the inner diameter of the large-diameter pipe 22 is formed to be larger than the inner diameter of the small-diameter pipe 21, a large amount of outside air can be taken into the large-diameter pipe 22 at the dividing portion 221a. Thereby, the temperature of exhaust gas can be lowered.

Airframe frame 2 according to the present embodiment is an embodiment of a vehicle body frame according to the present invention.
The upper bent portion 222a according to the present embodiment is an embodiment of the bent portion according to the present invention.

In the present embodiment, the upper bent portion 222 a is provided in the large diameter pipe 22.
Thereby, compared with the case where the bending part is provided in the small diameter pipe 21, the resistance of the exhaust gas in a bending part can be reduced.

The small diameter pipe 21 is formed shorter than the large diameter pipe 22.
Thereby, the resistance of the exhaust gas can be reduced.

Further, most of the small-diameter pipe 21 is arranged at a position that does not overlap with the connection frame 121 and the second frame 112 in a side view.
As a result, a sufficient stroke can be ensured when the upper end (opening) of the small diameter pipe 21 is fitted into the exhaust port of the SCR 7b. When mounting the large diameter pipe 22, the large diameter pipe 22 may be moved upward so as to pass between the first frame 111 and the second frame 112 and connected to the small diameter pipe 21. Thereby, the muffler 20 can be mounted on the vehicle body 1 while the front loader 10 is mounted on the vehicle body 1. Further, the muffler 20 can be easily detached during the maintenance of the muffler 20.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, in the present embodiment, the muffler 20 is configured so as to be divided vertically in the dividing unit 221a, but the present invention is not limited to this. The muffler 20 may be one that cannot be divided vertically.

  In the present embodiment, the muffler 20 includes the small-diameter pipe 21 and the large-diameter pipe 22 having an inner diameter larger than that of the small-diameter pipe 21, but the present invention is not limited to this. The muffler 20 may have a constant inner diameter.

  In the present embodiment, the lower bent portion 223a is formed below the upper bent portion 222a. However, the present invention is not limited to this. The lower bent portion 223a is not necessarily formed.

1 Car body 2 Airframe frame 6 Engine 7b SCR
DESCRIPTION OF SYMBOLS 10 Front loader 12 Boom 20 Muffler 111 1st frame 112 2nd frame 113 1st connection part 114 2nd connection part 221a Dividing part 222a Upper bending part 223a Lower bending part

Claims (7)

A muffler for a tractor that can be attached to the vehicle body as a separate body from the front loader and is arranged to extend in a substantially vertical direction at a side portion of the vehicle body,
A bent part is formed in the middle of the upper and lower parts such that the lower side bends forward with respect to the upper side.
The portion located below the bent portion is
In a side view, of the front loader mounted on the vehicle body, a first connecting portion that connects a first frame fixed to the vehicle body and a second frame arranged outside the first frame. Arranged to pass forward,
The portion located above the bent portion is
In the side view, among the front loaders in a state of being mounted on the vehicle body, the second load frame is disposed so as to pass behind the second connection portion connected to the boom.
Tractor muffler. In the divided portion located above the bent portion, it is formed so as to be divided vertically.
The muffler of the tractor according to claim 1. The dividing unit is
In a side view, it is arranged at a position that does not overlap with the front loader in a state of being mounted on the vehicle body.
The tractor muffler according to claim 2. The inner diameter of the portion located below the divided portion is:
It is formed so as to be larger than the inner diameter of the portion located above the divided portion.
The tractor muffler according to claim 2 or claim 3. A lower bent portion is formed in a portion located below the bent portion such that the lower side bends downward with respect to the upper side.
The tractor muffler according to any one of claims 1 to 4. The upper end is connected to the SCR located at the top of the engine.
A muffler for a tractor according to any one of claims 1 to 5. The lower end is opened below the body frame,
The muffler of the tractor according to any one of claims 1 to 6.

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