WO2012133524A1

WO2012133524A1 - Cab for working vehicle, and working vehicle

Info

Publication number: WO2012133524A1
Application number: PCT/JP2012/058115
Authority: WO
Inventors: 明三須; 陽造北島; 達志伊藤
Original assignee: 株式会社小松製作所
Priority date: 2011-03-31
Filing date: 2012-03-28
Publication date: 2012-10-04

Abstract

An A-pillar (11a₁), a B-pillar (11b), and a C-pillar (11c₁) are disposed along a left side face (10D) so as to be located sequentially from the front face (10A) side to the rear face (10B) side and so as to support a roof portion (12). A mount section (14) is a portion which is provided so as to extend further toward the rear face (10B) side than an operator seat mounting section (13) and which is configured so that a counterweight (5) can be attached thereto. The C-pillar (11c₁) is connected to the mount section (14). The configuration provides a cab for a working vehicle and a working vehicle which are configured so that the load of the roof of the cab can be sufficiently supported even if the interior space for an operator is expanded and so that the rigidity of the cab is increased.

Description

Work vehicle cab and work vehicle

The present invention relates to a work vehicle cab and a work vehicle.

For example, a hydraulic excavator equipped with a work device for excavation work is known as a work vehicle. Such a hydraulic excavator is composed of a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device provided on the front side of the upper revolving body. Yes.

Also, as the hydraulic excavator, for example, there is a small hydraulic excavator called a rear small swing machine (hereinafter referred to as a small swing hydraulic excavator). This small turning type hydraulic excavator is configured so that the upper turning body is formed in a substantially circular shape when viewed from the upper side so that when the upper turning body turns, it fits within the vehicle width of the lower traveling body. .

The upper swing body of this small swing type hydraulic excavator has a swing frame as a base, and a cab on which an operator rides is mounted on the swing frame. Such a cab configuration is described in, for example, Japanese Patent Laid-Open No. 2008-303666 (see Patent Document 1).

The cab described in this publication includes a pair of left and right A pillars arranged in front of the cab and a pair of left and right B pillars arranged in the center, with the roof (ceiling) supported from the lower surface side. Have. The rear end portion of the cab roof is in a state like a cantilever beam (hereinafter referred to as a cantilever state) with the B pillar as a fulcrum.

JP 2008-303666 A

In the above-mentioned small swing type excavator, there is a demand for securing a larger space for the operator in the cab within the limited size range of the upper swing body. In order to expand the living space, it is necessary to increase the length of the cab roof in the front-rear direction. In this case, if the distance between the A pillar and the B pillar is increased in order to reduce the rearward projecting amount of the cantilevered portion of the cab roof, the central portion of the cab roof between the A pillar and the B pillar It becomes difficult to sufficiently support the load.

Also, if the distance between the A pillar and the B pillar is reduced to increase the rearward extension of the cantilevered portion of the cab roof, it becomes difficult to sufficiently support the load at the rear end of the cab roof.

Also, a work vehicle is usually provided with a work device on the front side of the upper swing body and a counterweight for the work device on the rear side. For this reason, the counterweight is usually attached to the rear side of the cab. Therefore, when the living space is expanded, if the distance between the A pillar and the B pillar is reduced as described above, the displacement between the mounting position for mounting the counterweight on the cab and the mounting position of the B pillar is shifted. growing. In this case, the rigidity of the entire cab may be insufficient.

Accordingly, an object of the present invention is to provide a cab for a work vehicle and a work vehicle that can sufficiently support the load on the cab roof and can improve the cab rigidity even when an operator's living space is expanded. is there.

In the cab described in the above publication, an A pillar is arranged on the front side and a B pillar is arranged in the center. In order to reduce the overhang of the rear end portion of the cab roof, increasing the distance between the A pillar and the B pillar is disadvantageous in supporting the load at the center of the cab roof. Therefore, the position of the B pillar is moved from the rear end of the cab to the center as described above. Further, in order to ensure the rigidity of the cab body, a mount portion for mounting the cab on the revolving frame is disposed in the vicinity of the B pillar.

In addition, a fastening member such as a bolt is attached to the mount part, and it is necessary to secure a horizontal plane on the cab floor in order to attach the fastening member. In addition, since the cab floor supports the B pillar, it is necessary to secure a horizontal plane for supporting the B pillar on the cab floor. Further, a bracket for connecting the cab to the counterweight is disposed under the cab floor, and it is necessary to secure a horizontal plane for disposing the bracket. Since these horizontal surfaces are provided in the vicinity of the B pillar or on the rear side of the B pillar, the structure of the rear side bottom surface of the cab floor located on the rear side from the center in the front-rear direction of the cab becomes complicated.

Sealing material is provided on the bottom surface of the cab floor, but if the structure of the bottom surface of the cab floor is complicated as described above, the seal length is increased and the sealing function is likely to deteriorate. Become.

Therefore, another object of the present invention is to provide a work vehicle cab and a work vehicle that can improve the sealing function on the rear bottom surface of the cab floor and shorten the seal length.

One cab for a work vehicle according to the present invention includes a roof portion, a driver seat mounting portion on which an operator is seated, and a front surface, a rear surface, a right side surface, and a left side surface disposed so as to surround the mounting portion. The work vehicle cab is configured to be capable of attaching a counterweight, and includes a first front pillar, a center pillar, a first rear pillar, and a mount. The first front pillar, the center pillar, and the first rear pillar are arranged in order from the front surface side to the rear surface side in either one of the right side surface and the left side surface so as to support the roof portion. The mount portion is a portion that is provided so as to extend to the rear surface side from the attachment portion and is configured so that a counterweight can be attached thereto. The first rear pillar is connected to the mount portion.

According to the cab for a work vehicle of the present invention, the mount portion is provided so as to extend to the rear side of the driver seat mounting portion. For this reason, it becomes possible to connect and provide a 1st rear pillar to a mount part in the back surface side rather than the attachment part.

And by providing the first rear pillar, the roof portion can be supported on the rear side by the first rear pillar. For this reason, even when expanding an operator's living space, it becomes possible to fully support the load of a roof part compared with the case where a roof part is supported only by a 1st front pillar and a center pillar.

Moreover, both the counterweight and the first rear pillar can be attached to the rear side of the driver seat mounting portion by the mount portion. For this reason, the attachment position of a counterweight and a 1st rear pillar can be brought close. Therefore, even when the operator's living space is expanded, the cab rigidity can be improved.

The one work vehicle cab further includes a second front pillar and a second rear pillar arranged in order from the front surface side to the rear surface side on either the right side surface or the left side surface, and the second rear pillar is mounted on the mount portion. The cross section of the cross section of the first rear pillar is smaller than the cross section of the cross section of the second rear pillar. Thus, since the cross-sectional area of the cross section of the first rear pillar is set small, the rear visibility on the side surface side where the first rear pillar is arranged is improved.

In the above work vehicle cab, the first rear pillar is formed of a round pipe, and the second rear pillar has a rectangular cross-sectional shape. Thereby, since the thickness of the first rear pillar does not change depending on the viewing angle, the rear visibility on the side surface side where the first rear pillar is arranged is further improved. Further, since the second rear pillar has a rectangular cross-sectional shape, it is possible to obtain high rigidity by the second rear pillar.

The one work vehicle cab further includes a forged part attached to the mount part so as to extend to the rear side of the mount part, and the first rear pillar is connected to the mount part via the forged part. .

In the above work vehicle cab, the first rear pillar is bent from the portion located on the rear surface side of the mount portion to the front surface side and connected to the mount portion.

The one cab for a work vehicle further includes a cab floor having an attachment portion, and the cab floor has a curved shape except for the attachment portion. As a result, it is possible to easily attach the heat insulating material to the curved cab floor and enhance the heat insulating effect, and it is also easy to apply the sealing member for ensuring airtightness, thereby enhancing the airtight effect.

One work vehicle according to the present invention includes the work vehicle cab described above and a counterweight attached to a mount portion.

According to one work vehicle of the present invention, since the counterweight is attached to the mount portion, the connection position between the first rear pillar and the mount portion can be positioned directly above the counterweight. For this reason, the attachment position of a counterweight and a 1st rear pillar can be brought close. Therefore, even when the operator's living space is expanded, the cab rigidity can be improved.

Other work vehicle cabs of the present invention include a roof portion, a cab floor, a plurality of pillars connecting the roof portion and the cab floor, a front surface, a rear surface, a right side surface, and a left side surface. The bottom surface of the cab floor includes a front bottom surface portion located on the front surface side of the cab and a rear bottom surface portion located on the rear surface side of the cab. The entire shape of the front bottom surface is a flat surface, and the rear bottom surface includes a left end region located on the left side of the cab and a right end region located on the right side of the cab. The entire shape of the left end region and the right end region is a flat curved surface. Here, the term “flat curved surface” as used herein means a generally curved shape as a whole, and a part that is not curved, such as a straight part, or a slight step or uneven part. Etc. may be included.

According to another work vehicle cab of the present invention, the seal member is installed in the left end region and the right end region, but as described above, the overall shape of the left end region and the right end region is as described above. By making a curved shape, the shape of the installation region of the seal member can be made simple. Thereby, compared with the case where each said area | region has a complicated shape, the sealing function by a sealing member can be improved, and it becomes possible to shorten seal length.

In the other work vehicle cab, the left end region and the right end region are formed from the rear end in the left end region and the right end region, and from the front end in the left end region and the right end region. It curves in the front-back direction of the cab toward. By forming the left end region and the right end region in such a shape, the sealing function by the seal member can be improved as described above, and the seal length can be shortened.

In the other work vehicle cab, the left end region and the right end region may be formed of arcuate portions. Thereby, a sealing member can be easily installed on these areas.

In the other work vehicle cab, the left end region and the right end region may be configured by an arc-shaped portion and a linear portion extending linearly. The linear portion may be disposed on the front surface side of the cab in the bottom surface portion on the rear side of the cab floor, may be disposed on the rear surface side of the cab, and is disposed on both the front surface side and the rear surface side of the cab. Also good. Also in this case, the seal member can be easily installed.

The other cab for the work vehicle is preferably arranged on the counterweight, and includes a mount portion to which the counterweight can be attached on the rear surface side of the cab. At this time, the pillar includes a rear pillar disposed on the rear surface side of the cab. The rear pillar is connected to the mount portion. By providing the rear pillar in this way, the rigidity of the cab can be improved. Further, by joining the rear pillar to the mount portion, it is not necessary to provide a horizontal surface for receiving the pillar on the rear bottom surface portion of the cab floor, and the shape of the rear bottom surface portion of the cab floor can be made simple. . As a result, as described above, the shape of the left end region and the right end region, which are the installation regions of the seal member, can be made simple, improving the sealing function of the seal member and increasing the seal length. It can be shortened.

Another work vehicle according to the present invention includes the work vehicle cab described above and a counterweight attached to a mount portion of the cab.

As described above, according to the work vehicle cab and the work vehicle of the present invention, it is possible to sufficiently support the load on the cab roof and improve the cab rigidity even when the living space of the operator is expanded. It is also possible to do.

Also, according to the other cab for a work vehicle and the work vehicle of the present invention, it is possible to improve the sealing function on the rear side bottom surface of the cab floor and shorten the seal length.

1 is a perspective view schematically showing a configuration of a work vehicle in Embodiment 1 of the present invention. It is a disassembled perspective view which shows roughly the structure of the cab for work vehicles and the counterweight in Embodiment 1 of this invention. It is the perspective view which looked at the structure of the cab for work vehicles in Embodiment 1 of this invention from the downward direction. It is an assembly perspective view which shows roughly the structure of the cab for work vehicles and the counterweight in Embodiment 1 of this invention. It is an assembly side view which shows roughly the structure of the cab for work vehicles and the counterweight in Embodiment 1 of this invention. It is an assembly top view which shows roughly the structure of the cab for work vehicles and the counterweight in Embodiment 1 of this invention. FIG. 3 is a partially enlarged perspective view showing an example of a configuration in which the C pillar is offset in the vicinity of the mount portion attachment portion in the work vehicle cab according to the first embodiment of the present invention. FIG. 8 is a partially enlarged perspective view further enlarging FIG. 7 and showing a part thereof transparently. FIG. 6 is a partially enlarged perspective view showing another example of a configuration in which the C pillar is offset in the vicinity of the mount portion attachment portion in the work vehicle cab according to Embodiment 1 of the present invention. FIG. 10 is a partially enlarged side view showing another example of a configuration in which the C pillar is offset in the vicinity of the mount portion attachment portion in the work vehicle cab according to Embodiment 1 of the present invention. It is a side view of the cab for work vehicles in Embodiment 2 of this invention. It is a side view of the cab for other work vehicles in Embodiment 2 of this invention. It is a side view of the cab for other work vehicles in Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
Referring to FIG. 1, work vehicle 1 of the present embodiment is, for example, a small turning hydraulic excavator, and is mounted on self-propelled lower traveling body 2 and turnable on lower traveling body 2. The upper swing body 4 and a work device 3 provided on the front side of the upper swing body 4 for excavating earth and sand are provided.

The lower traveling body 2 has, for example, a crawler belt, and the work vehicle 1 travels when the crawler belt is rotationally driven. A cab 10 that defines a cab for an operator to perform various operations is disposed, for example, on the left side of the front of the upper swing body 4. The work device 3 is disposed, for example, on the front right side (for example, the right side of the cab 10) of the upper swing body 4. This working device 3 has, for example, a boom, an arm, a bucket, a hydraulic cylinder, and the like.

1 and 2, the upper swing body 4 is mounted on a swing body frame (not shown), an engine, a muffler, and the like mounted on the rear side of the swing body frame, and the swing body frame. The cab 10 and the counterweight 5 attached to the cab 10 are mounted mainly on the rear end of the revolving unit frame.

Referring to FIG. 2, the cab 10 has a driver seat mounting portion 13 for an operator to sit on, and a front surface 10A, a rear surface 10B, a right side surface 10C, and a left side disposed so as to surround the mounting portion 13. Surface 10D. The front surface 10 A is a surface positioned in front of the operator in a state where the operator is seated on the driver's seat in the cab 10. Further, the rear surface 10B, the right side surface 10C, and the left side surface 10D are surfaces positioned on the rear, right side, and left side of the operator, respectively.

The cab 10 mainly includes a cab floor 15, a roof portion 12, five pillars 11 a ₁ , 11 a ₂ , 11 b, 11 c ₁ , 11 c _2, and a mount portion 14. The cab floor 15 has the mounting portion 13. The attachment portion 13 is a dent portion formed in a curved portion of the cab floor 15. The roof portion 12 is located above the attachment portion 13. The five pillars 11 a ₁ , 11 a ₂ , 11 b, 11 c ₁ , 11 c ₂ extend vertically between the cab floor 15 and the roof portion 12, and support the roof portion 12 with respect to the cab floor 15. Yes. The mount portion 14 is provided so as to extend to the rear surface 10B side with respect to the mounting portion 13. The mount portion 14 is configured so that the counterweight 5 can be attached thereto.

For example, three pillars 11a ₁ , 11b, and 11c ₁ are arranged on the left side surface 10D of the cab 10. The A pillar (first front pillar) 11a ₁ , B pillar (center pillar) 11b, and C pillar (first rear pillar) 11c ₁ forming these three pillars are arranged in this order from the front surface 10A side to the rear surface 10B side. ing. Two pillars 11a ₂ and 11c ₂ are arranged on the right side 10C of the cab 10, for example. Of these two pillars, an A pillar (second front pillar) 11a ₂ is disposed on the front surface 10A side, and a C pillar (second rear pillar) 11c ₂ is disposed on the rear surface 10B side.

An opening is formed between the A pillar 11a ₁ and the B pillar 11b on the left side surface 10D. In this opening, for example, an opening / closing door 17 (FIG. 1) for an operator to enter and exit the cab 10 is provided. Therefore, for example, the B pillar 11b is provided with a door hinge for attaching the opening / closing door 17. Also in the central portion between the A pillar 11a ₂ and C-pillar 11c ₂ of the right side surface 10C, pillars corresponding to the B-pillar 11b of the left side surface 10D is not provided, the A-pillar 11a ₂ and C-pillar 11c ₂ It is an opening between the two.

Each of the pair of left and right C pillars 11c ₁ and 11c ₂ is directly connected to the mount portion 14 on the rear surface 10B side with respect to the mounting portion 13. The cross-sectional area of the cross section of the C pillar 11c ₁ located on the left side surface 10D is preferably smaller than the cross section of the cross section of the C pillar 11c ₂ located on the right side face 10C. The C pillar 11c ₁ is preferably composed of a round pipe. The C pillar 11c ₂ preferably has a rectangular cross section.

Referring to FIG. 3, the floor surface of the portion of cab floor 15 sandwiched between A pillar 11a ₁ and B pillar 11b on left side surface 10D is made of a flat plate. Further, a driver seat mounting portion 13 (see FIG. 2) is provided in a portion of the cab floor 15 on the rear surface 10B side of the B pillar 11b on the left side surface 10D, and the portion of the cab floor 15 other than the mounting portion 13 is It has a curved shape with no irregularities. Since it is necessary to arrange a rail for moving the driver's seat back and forth in the mounting portion 13, the mounting portion 13 is a portion that requires a flat surface parallel to the front-rear direction. For this reason, this attachment part 13 cannot be made into the shape along the curved shape of the cab floor 15. In addition, the B pillar 11b is located on the side of the front end of the mounting portion 13.

Referring to FIG. 2, a mount portion 14 is disposed so as to extend further from the formation position of the mounting portion 13 of the cab floor 15 to the rear surface 10B side. The mount portion 14 may be formed of a member (for example, a steel plate) that is integral with the cab floor 15 or may be formed of a separate member.

The counterweight 5 is attached to the mount portion 14 by a so-called rubber mount.

The rubber mount includes

rubber members

31a and 31b, a cylindrical collar 32, a cup 33, a washer 34, and a bolt 35. The

rubber members

31 a and 31 b are for absorbing vibration by sandwiching the upper and lower sides of the mount portion 14. The cylindrical collar 32 is for receiving the tightening force of the bolt 25 so that the

rubber members

31a and 31b are not crushed when the tightening force of the bolt 35 is applied to the

rubber members

31a and 31b. The cylindrical collar 32 is located over each of the through hole 14a of the mount portion 14 and the through holes of the

rubber members

31a and 31b. The cup 33 is for holding the rubber member 31b from above. The bolt 35 passes through the through holes of the washer 34, the cup 33 and the cylindrical collar 32 and is screwed into the screw hole 24 of the counterweight 5, whereby the counterweight 5 is attached to the mount portion 14.

4 to 6, when the counterweight 5 is attached to the mount portion 14, the rubber mount and the C pillars 11c ₁ and 11c ₂ are both located on the mount portion 14, and the counter Located just above the weight 5. The rubber mount and the C pillars 11c ₁ and 11c ₂ are disposed close to each other.

In the present embodiment, the configuration in which the C pillar 11c ₁ on the left side surface 10D extends linearly from the upper side to the rear (downward) and is directly connected to the mount part 14 has been described. However, the C pillar 11c ₁ It may be offset to 14 and connected to the mount portion 14. Hereinafter, the configuration will be described with reference to FIGS.

Referring to FIGS. 7 and 8, cab 10 includes forged component 16 attached to mount portion 14 so as to extend to rear surface 10 B side with respect to mount portion 14. The C pillar 11c ₁ is connected to the mount part 14 with the forged part 16 interposed therebetween, and the connection part between the C pillar 11c ₁ and the forged part 16 is located on the rear side of the part located on the most rear face 10B side of the mount part 14. Located on the 10B side. Since the configurations shown in FIGS. 1 to 6 are almost the same for the other configurations, the same members are denoted by the same reference numerals and description thereof will not be repeated.

With reference to FIGS. 9 and 10, in this cab 10, the C pillar 11 c ₁ is bent from the portion located on the rear surface 10 B side relative to the mount portion 14 to the front surface 10 A side and connected to the mount portion 14. . Since the configurations shown in FIGS. 1 to 6 are almost the same for the other configurations, the same members are denoted by the same reference numerals and description thereof will not be repeated.

Next, the effect of this Embodiment is demonstrated.
According to the work vehicle cab 10 of the present embodiment, the mount portion 14 is provided so as to extend further to the rear surface 10B side than the driver seat mounting portion 13. For this reason, it becomes possible to connect the C pillar 11c ₁ to the mount portion 14 on the rear surface 10B side with respect to the mounting portion 13.

And by providing the C-pillar 11c _1, it is possible to support the roof 12 at the rear surface 10B side by the C-pillar 11c _1. For this reason, even when expanding the living space of the operator, the load on the roof portion 12 can be sufficiently supported as compared to the case where the roof portion 12 is supported only by the A pillar 11a ₁ and the B pillar 11b.

Further, both the counterweight 5 and the C pillar 11c ₁ can be attached to the rear surface 10B side of the driver seat mounting portion 13 by the mount portion 14. Therefore, it is possible to make the mounting position of the counterweight 5 and C-pillar 11c _1. Therefore, the rigidity of the cab 10 can be improved even when the operator's living space is expanded.

In this embodiment also, since it is smaller than the cross-sectional area of the cross section of the C-pillar 11c ₁ of the cross-sectional area of cross-section C-pillar 11c _2, C-pillar 11c ₁ is arranged side surface (e.g. The rear visibility on the left side surface 10D side is improved. Further, since the C pillar 11c ₁ is formed of a round pipe, the thickness of the C pillar 11c ₁ does not change depending on the viewing angle. Therefore, the rear visibility of the left side surface 10D can be further improved. Further, since the C pillar 11c ₂ has a rectangular cross-sectional shape, high rigidity can be obtained in the C pillar 11c ₂ .

In the present embodiment, since the three pillars 11a ₁ , 11b and 11c ₁ are arranged on the left side surface 10D of the cab 10, the B pillar 11b can be arranged close to the A pillar 11a ₁ . For this reason, the cab floor 15 can be curved on the rear surface 10B side from the B pillar 11b, and there is no need to connect the B pillar 11b in the middle of the curved portion of the cab floor 15. Further, since the C pillars 11c ₁ and 11c ₂ are also connected to the mount part 14 provided so as to extend from the attachment part 13 of the cab floor 15 to the rear surface 10B side, the C pillars 11c ₁ , is no need to connect 11c _2. This eliminates the need for a horizontal portion for receiving the B pillar 11b and the C pillars 11c ₁ and 11c ₂ in the curved portion of the cab floor 15, so that the portion of the cab floor 15 excluding the mounting portion 13 is evenly curved without unevenness. The shape can be made. For this reason, the cab floor 15 can be formed by pressing a single steel plate, and steps such as welding of the steel plate can be omitted.

Normally, the lower part of the cab floor 15 on the rear surface 10B side of the B pillar 11b is an engine room in which an engine is arranged, and is configured such that the flow of outside air sucked from the radiator passes through the engine room. ing. For this reason, this engine room must be sealed so as to be completely airtight.

In the present embodiment, since the portion of the cab floor 15 on the rear surface 10B side of the B pillar 11b can be curved without unevenness except for the attachment portion 13, the left end region 15b ₁ and the right end portion in FIG. It becomes easy to affix the seal member to each of the regions 15b ₂ along the curved shape without causing a gap between the region 15b ₂ and the cab floor 15. Thereby, it becomes easy to keep the air tightness in the engine room.

Further, normally, in the lower part of the portion of the cab floor 15 on the rear surface 10B side of the B pillar 11b, it is necessary to apply a heat insulating material to the entire back surface of the cab floor 15 so that heat from the engine, muffler, etc. is not transmitted to the driver's seat. is there.

In the present embodiment, since the portion of the cab floor 15 on the rear surface 10B side of the B pillar 11b can be curved without unevenness except for the attachment portion 13, a heat insulating material can be attached along the curved portion. It is not necessary to divide the heat-insulating material finely according to unevenness such as steps. For this reason, heat can be prevented from being transmitted from the gap between the finely divided heat insulating materials to the driver's seat side, and the heat insulating effect can be enhanced.

(Embodiment 2)
Referring to FIG. 3, cab floor 15 of the present embodiment is divided into a front side portion located on the front surface 10 A side of cab 10 and a rear side portion located on the rear surface 10 B side of cab 10. The front side portion is located between the A pillar 11a ₁ and the B pillar 11b of the left side surface 10D, and is configured by a flat plate member. Rear side portion is positioned between the B-pillar 11b and C-pillar 11c ₁ of the left side surface 10D, the overall shape of the aft portion is curved. As shown in FIG. 3, the bottom surface of the cab floor 15 includes a front bottom surface portion 15a located on the front surface 10A side and a rear side bottom surface portion 15b located on the rear surface 10B side.

The rear side bottom surface portion 15b is located on the left side surface 10D side of the cab 10 and has a left end region 15b ₁ having a predetermined width, and the right end portion located on the right side surface 10C side of the cab 10 and having a predetermined width. and a region 15b _2. The overall shapes of the left end region 15b ₁ and the right end region 15b ₂ are also curved.

As shown in FIG. 3, the left end region 15b ₁ and the right end region 15b ₂ are formed from an end portion on the rear surface 10B side of the cab 10 in these regions to an end portion on the front surface 10A side of the cab 10 in these regions. The cab 10 is curved in the front-rear direction. More specifically, the left end region 15b ₁ and the right end region 15b ₂ are curved toward the front of the cab 10 and extend while gradually descending.

As shown in FIG. 3, a step portion (protruding portion) is provided in the central region on the rear side of the rear bottom surface portion 15b located between the left end region 15b ₁ and the right end region 15b ₂ . Yes. This stepped portion is provided so as to protrude rearward and downward from the rear side bottom surface portion 15b, but is caused by providing the driver seat mounting portion 13 (see FIG. 2) described above. Since it is necessary to arrange the rail for moving a driver's seat back and forth in the attachment part 13, it is necessary to ensure a horizontal surface. Since it is difficult to make this horizontal plane follow the curved shape of the rear side portion of the cab floor 15, the above-described stepped portion remains. However, the presence of this stepped portion can improve the rigidity of the rear side portion of the cab floor 15.

The left end region 15b ₁ and the right end region 15b ₂ may be formed by curved portions such as arcuate portions, but if they are curved as a whole, they are linear portions that extend linearly, and some irregularities. An uncurved part such as a part or a flat part may be provided in part. However, it is preferable that the left end region 15b ₁ and the right end region 15b ₂ have a relatively simple and gentle shape as a whole so as not to have a complicated step shape as in the conventional example.

In the case where the above-described linear portions or the like are provided in the left end region 15b ₁ and the right end region 15b ₂ , the linear portions or the like can be provided at arbitrary locations in these regions. For example, the linear portion or the like may be disposed on the front surface 10A side, the rear surface 10B side, the front surface 10A side, and the rear surface 10B in the left end region 15b ₁ and the right end region 15b ₂ . You may arrange | position on both sides.

As shown in FIG. 3, a seal member 19 is installed on the left end region 15b ₁ and the right end region 15b ₂ . The seal member 19 is typically installed in an annular shape on the periphery of the rear side bottom surface portion 15b so as to surround the central region of the rear side bottom surface portion 15b. Here, as described above, the overall shape of the left end region 15b ₁ and the right end region 15b ₂ is generally curved, whereby the shape of the installation region of the seal member 19 can be made simple. . Thereby, compared with the case where the sealing member 19 is installed on a complicated step shape, the sealing function by the sealing member 19 can be improved. Further, the seal length can be shortened, and the amount of the seal member 19 can be reduced. Furthermore, the seal member 19 can be easily installed on each region.

Further, since the rear side portion of the cab floor 15 can be made simple as described above, the rear side portion of the cab floor 15 can be produced by, for example, a single metal sheet that is press-formed.

As shown in FIG. 3, a cooling device 18 such as a radiator may be disposed in the vicinity of the right side surface 10C. Moreover, you may arrange | position apparatuses, such as an engine and a muffler which are not shown in figure, using the space under the back side bottom face part 15b. As shown by the arrows in FIG. 3, the outside air or the like can be sent from the cooling device 18 to the equipment such as the engine and the muffler. By installing, the space (engine room) surrounded by the seal member 19 can be hermetically sealed. As a result, hot air from equipment such as an engine is prevented from entering the operator's cab through holes and gaps in the bottom surface.

Also, a heat insulating material is attached to the rear bottom surface portion 15b so that heat from the engine, the muffler, etc. is not transmitted to the driver's seat. At this time, as shown in FIG. 3, since the overall shape of the rear side bottom surface portion 15b is gentle and simple, a heat insulating material can be easily adhered to the rear side bottom surface portion 15b. Moreover, since there are few steps in the back side bottom surface portion 15b, the amount of necessary heat insulating material can be reduced. In addition, since it is not necessary to divide the insulation into finely divided parts such as steps, it is possible to effectively prevent heat from being transmitted to the driver's seat through the gap between the finely divided insulation. Can also be increased.

Referring to FIG. 2 again, the mount portion 14 is disposed so as to extend further to the rear surface 10B side from the position where the mounting portion 13 of the cab floor 15 is formed. The mount portion 14 may be formed of a member (for example, a steel plate) that is integral with the cab floor 15 or may be formed of a separate member.

The rubber mount includes

rubber members

31a and 31b, a cylindrical collar 32, a cup 33, a washer 34, and a bolt 35. The

rubber members

31a and 31b. The cylindrical collar 32 is located over each of the through holes of the mount portion 14 and the through holes of the

rubber members

By providing the C pillars 11c ₁ and 11c ₂ as described above, the rigidity of the cab 10 can be improved. Further, by joining the C pillars 11 c ₁ and 11 c ₂ to the mount portion 14, there is no need to provide a horizontal surface for receiving the pillars on the rear bottom surface portion 15 b of the cab floor 15, and the rear bottom surface portion 15 b of the cab floor 15 is provided. The shape can be a simple shape. As a result, as described above, the shapes of the left end region 15b ₁ and the right end region 15b ₂ that are the installation regions of the seal member 19 can be made simple, and the sealing function by the seal member 19 is improved. At the same time, the seal length can be shortened.

In the above-described embodiment, the C pillar 11c ₁ on the left side surface 10D extends linearly from the upper side to the rear (lower side) and is directly connected to the mount portion 14. However, the C pillar 11c ₁ has been described. May be offset in the vicinity of the mount 14 and connected to the mount 14.

Next, the side structure of the cab 10 will be described with reference to FIGS. FIG. 11 is a side view of the cab 10 according to the second embodiment described above, and FIGS. 12 and 13 are side views of another cab 10 according to the second embodiment.

As shown in FIG. 11, when the cab 10 is viewed from the left side, the left end region 15b ₁ has a shape curved in a substantially arc shape. However, as shown in FIG. 12 may be provided with straight portions 15c at the left end region 15b _1. In the example of FIG. 12, the front side end portion of the left end region 15b ₁ is configured by the linear portion 15c, but the linear portion 15c may be provided in other portions. Moreover, as shown in FIG. 13, it is also possible not to provide the level | step-difference part as shown in FIG. 3 in the center area | region of the back side of the back side bottom face part 15b. In this case, the rear side bottom surface portion 15b has fewer steps and irregularities, and the entire rear side bottom surface portion 15b can be made simpler. Thereby, the installation area of a heat insulating material can further be reduced. Further, when the rear portion of the cab floor 15 is produced by press molding, the press molding is further facilitated.

Since the configuration of the present embodiment other than the above is substantially the same as the configuration of the first embodiment described above, the same elements are denoted by the same reference numerals, and description thereof is not repeated.

Next, the effect of the configuration of the present embodiment other than the above will be described.
According to the work vehicle cab 10 described above, the mount portion 14 is provided so as to extend further toward the rear surface 10B side than the driver seat mounting portion 13. For this reason, the C pillar 11c ₁ can be provided by being bonded to the mount portion 14 on the rear surface 10B side with respect to the mounting portion 13.

Further, by providing the C-pillar 11c _1, it is possible to support the roof 12 at the rear surface 10B side by the C-pillar 11c _1. For this reason, even when expanding the living space of the operator, the load on the roof portion 12 can be sufficiently supported as compared to the case where the roof portion 12 is supported only by the A pillar 11a ₁ and the B pillar 11b.

Furthermore, both the counterweight 5 and the C pillar 11c ₁ can be attached to the rear surface 10B side of the driver seat mounting portion 13 by the mount portion 14. Therefore, it is possible to make the mounting position of the counterweight 5 and C-pillar 11c _1. Therefore, even when the operator's living space is expanded, the rigidity of the cab 10 when subjected to a falling load can be improved.

Further, since the three pillars 11a ₁ , 11b and 11c ₁ are arranged on the left side surface 10D of the cab 10, the B pillar 11b can be arranged close to the A pillar 11a ₁ . For this reason, the cab floor 15 can be curved on the rear surface 10B side from the B pillar 11b, and it is not necessary to join the B pillar 11b in the middle of the curved portion of the cab floor 15.

Since the C pillars 11c ₁ and 11c ₂ are also joined to the mount part 14 provided so as to extend from the attachment part 13 of the cab floor 15 to the rear surface 10B side, the C pillars 11c ₁ and 11c ₁ is no need for joining 11c _2. This eliminates the need for a horizontal portion for receiving the B pillar 11b and the C pillars 11c ₁ and 11c ₂ in the curved portion of the cab floor 15, so that the portion of the cab floor 15 excluding the mounting portion 13 is uniformly smooth without unevenness. Can be made into a curved shape.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 work vehicle, 2 undercarriage, 3 working device, 4 an upper swing structure 5 counterweight, 10 work vehicle cab, 10A front, 10B rear surface, 10C right side, 10D left side, 11a _1, 11a ₂ A-pillar, 11b B pillar, 11c ₁ , 11c ₂ C pillar, 12 roof part, 13 mounting part, 14 mount part, 14a through hole, 15 cab floor, 15a front side bottom part, 15b rear side bottom part, 15b ₁ left end area 15b ₂ right end region, 15c linear portion, 16 forged parts, 17 open / close door, 18 cooling device, 19 sealing member, 24 screw hole, 25 bolt, 31a, 31b rubber member, 32 cylindrical collar, 33 cup, 34 Washer, 35 volts.

Claims

It has a roof portion, a driver seat mounting portion for an operator to sit on, and a front surface, a rear surface, a right side surface, and a left side surface arranged so as to surround the mounting portion, and is configured to be able to mount a counterweight. A working vehicle cab,
A first front pillar, a center pillar, and a first rear pillar arranged in order from the front surface side to the rear surface side in any one of the right side surface and the left side surface so as to support the roof portion;
A mounting portion configured to be able to attach the counterweight, provided to extend to the rear side of the mounting portion;
A work vehicle cab, wherein the first rear pillar is connected to the mount portion.
A second front pillar and a second rear pillar arranged in order from the front surface side to the rear surface side on either the right side surface or the left side surface;
The second rear pillar is connected to the mount;
2. The work vehicle cab according to claim 1, wherein a cross-sectional area of a cross section of the first rear pillar is smaller than a cross-sectional area of a cross section of the second rear pillar.
The work vehicle cab according to claim 2, wherein the first rear pillar is formed of a round pipe, and the second rear pillar has a rectangular cross-sectional shape.
Further comprising a forged part attached to the mount part so as to extend to the rear side of the mount part,
The work vehicle cab according to any one of claims 1 to 3, wherein the first rear pillar is connected to the mount through the forged part.
The work vehicle cab according to any one of claims 1 to 3, wherein the first rear pillar is bent toward the front surface side from a portion located on the rear surface side with respect to the mount portion and connected to the mount portion. .
Further comprising a cab floor having the mounting portion,
The work vehicle cab according to any one of claims 1 to 5, wherein the cab floor has a curved shape except for the attachment portion.
A work vehicle cab according to any one of claims 1 to 6,
A work vehicle comprising the counterweight attached to the mount portion.
A work vehicle cab comprising a roof portion, a cab floor, a plurality of pillars connecting the roof portion and the cab floor, a front surface, a rear surface, a right side surface, and a left side surface,
The bottom surface of the cab floor includes a front bottom surface portion located on the front side of the cab, and a rear bottom surface portion located on the rear surface side of the cab,
The front side bottom surface portion has a flat shape as a whole,
The rear side bottom portion includes a left end region located on the left side of the cab, and a right end region located on the right side of the cab,
A work vehicle cab in which the entire shape of the left end region and the right end region is a flat curved surface.
The left end region and the right end region in the rear bottom surface portion are front end portions in the left end region and the right end region from the rear end portion in the left end region and the right end region. The cab for a work vehicle according to claim 8, wherein the cab is curved in a front-rear direction of the cab toward the front.
The work vehicle cab according to claim 8 or 9, wherein the left end region and the right end region are configured by arc-shaped portions.
The work vehicle cab according to claim 8 or 9, wherein the left end region and the right end region are configured by an arc-shaped portion and a linear portion extending linearly.
The cab is disposed on a counterweight, and includes a mount portion to which the counterweight can be attached on the rear surface side of the cab,
The pillar includes a rear pillar disposed on the rear surface side of the cab,
The work vehicle cab according to any one of claims 8 to 11, wherein the rear pillar is connected to the mount portion.
A work vehicle cab according to any one of claims 8 to 12,
A work vehicle comprising: the counterweight attached to the mount portion of the cab.