JP2013023070A - Cabin of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cabin of a construction machine reduced in cost and improved in product accuracy, reliability, and rigidity.SOLUTION: At least one of a roof-side structure member 2, a floor-side structure member 3, and a cabin-side structure member 4 which constitute a skeleton of a cabin 1 of a construction machine is constituted in a frame shape by bending one pipe and welding its start end and terminal end to each other, or bending two pipes (24, 25), (34, 35) and connecting them by welding. Consequently, welding parts are considerably reduced than before to reduce the cost and to improve the product accuracy, reliability, and rigidity.

Description

  The present invention relates to a cabin of a construction machine, and more particularly, to a cabin of a construction machine that reduces costs and improves product accuracy and rigidity.

  As a cabin of a construction machine such as a wheel loader, vibration loader or hydraulic excavator, a roof-side structural member configured in a frame shape by welding pipes, and a floor side configured in the same manner disposed below the roof side structural member A member having a structural member and a pillar (cabside structural member) for connecting the roof-side structural member and the floor-side structural member is known (see Patent Document 1).

  An outline of a cabin of this type of construction machine will be described with reference to FIGS. FIG. 1 is a perspective view showing an appearance C of a cabin of a construction machine, and FIG. 2 is a perspective view showing a skeleton (structure) of a conventional cabin 1x. As shown in FIGS. 1 and 2, a cabin 1x having a fixed windshield G includes a roof-side structural member 2x configured in a frame shape, and a frame-shaped floor-side structural member 3x disposed below the roof-side structural member 3x. A pillar 4x that connects the roof-side structural member 2x and the floor-side structural member 3x is provided.

  Conventionally, the roof-side structural member 2x and the floor-side structural member 3x are configured by welding a plurality of substantially straight pipes 5x in a frame shape.

JP 2007-46396 A

  However, if the roof-side structural member 2x and the floor-side structural member 3x are formed in a frame shape by welding a plurality of substantially straight pipes 5x, the following problems occur.

(1) Since there are many welding locations, the welding cost increases.
(2) Since a plurality of welding distortions occurring in each welded portion are accumulated, product accuracy is deteriorated.
(3) It is necessary to maintain welding requirements such as an appropriate penetration depth for all the welds, and it is difficult to ensure reliability.
(4) When an outer plate or glass is mounted on the surface of the welded portion, it is necessary to cut the weld bead of each welded portion with a grinder, which increases the number of steps.
(5) In order to prevent the deformation of the corner portion 6x formed by welding the pipes, it is necessary to frequently use reinforcement for providing the gusset 7x inside the corner portion 6x.

  The object of the present invention, which was created in view of the above circumstances, is to provide a construction machine cabin in which the number of welding points is reduced as much as possible, the cost is reduced, and product accuracy, reliability, and rigidity are improved. There is.

  According to the present invention created to achieve the above-described object, at least one of a roof-side structural member, a floor-side structural member, and a cabside structural member constituting a skeleton of a construction machine cabin is a single pipe. A construction machine characterized in that it is constructed in a frame shape by bending and welding at the start and end, or by bending at least one of two pipes and connecting them by welding Cabin is provided.

  The roof side structural member is arranged in the vehicle width direction by connecting the front header arranged in the vehicle width direction, the roof rail arranged in the vehicle length direction from both ends of the front header, and the rear ends of the roof rails. It is constructed in a frame shape by bending two pipes and connecting them by welding, and the connection part by welding these pipes is arranged on the front header and the rear header May be.

  The floor-side structural member connects the front cross member disposed in the vehicle width direction, the side members disposed in the vehicle length direction from both ends of the front cross member, and the rear ends of the side members to each other. The rear cross member is disposed in the direction, and is formed by bending two pipes and connecting them by welding, and the connection part by welding the pipes is formed by the front cross member and the rear cross. It may be arranged with members.

  The cab side structural member has front and rear pillars spaced in the vehicle length direction, a top rail connecting the upper ends of the pillars, and a floor rail connecting the lower ends of the pillars, and two pipes And connecting them by welding, and connecting portions by welding the pipes may be arranged on the top rail and the floor rail.

  Further, according to the present invention, the roof side structural member and the floor side structural member constituting the skeleton of the cabin of the construction machine are each bent by bending one pipe and welding its start and end, Alternatively, at least one of the two pipes is bent and connected by welding to form a frame shape, and a roof-side bent protrusion is provided on the outer surface of the bent portion of the pipe constituting the roof-side structural member. In addition, a floor-side bent protrusion is provided on the outer surface of the bent portion of the pipe constituting the floor-side structural member, and a pillar is provided to bridge the roof-side bent protrusion and the floor-side bent protrusion. A construction machine cabin is provided.

  According to the cabin of the construction machine according to the present invention, at least one of the roof-side structural member, the floor-side structural member, and the cabside structural member constituting the cabin skeleton is formed by bending one pipe. And a terminal end or by bending at least one of two pipes and connecting them by welding. For this reason, the number of welded portions is significantly reduced compared to the prior art, and costs can be reduced, and product accuracy, reliability, and rigidity can be improved.

It is a perspective view which shows the external appearance of the cabin of a construction machine. It is a perspective view which shows the frame | skeleton (structure) of the cabin of the construction machine which shows a prior art example. It is a perspective view which shows the frame | skeleton of the cabin of the construction machine which concerns on 1st Embodiment of this invention. It is a perspective view which shows the frame | skeleton of the cabin of the construction machine which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the frame | skeleton of the cabin of the construction machine which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the frame | skeleton of the cabin of the construction machine which concerns on 4th Embodiment of this invention. It is a perspective view which shows the frame | skeleton of the cabin of the construction machine which concerns on 5th Embodiment of this invention. It is a perspective view which shows the frame | skeleton of the cabin of the construction machine which concerns on 6th Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment: cabin 1 of a construction machine)
A cabin 1 of a construction machine according to a first embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a skeleton of the cabin 1 of the construction machine according to the first embodiment. The cabin 1 connects a roof-side structural member 2 configured in a frame shape, a frame-shaped floor-side structural member 3 disposed below the roof-side structural member 2, and the roof-side structural member 2 and the floor-side structural member 3. The cab side structural member 4 is provided.

(Roof side structural member 2)
The roof-side structural member 2 includes a front header 21 disposed in the vehicle width direction, a roof rail 22 disposed in the vehicle length direction from both ends of the front header 21, and a rear end of the roof rail 22 connected to each other. The rear header 23 arranged in the width direction is configured in a frame shape. The roof-side structural member 2 is configured in a frame shape by bending the two pipes 24 and 25 into a substantially U-shape (using a pipe bender or the like), and connecting them by welding. Yes. A connection portion 26 formed by welding the pipes 24 and 25 to each other is disposed at approximately the center of the front header 21 and approximately the center of the rear header 23. This is because these places are the places where the cabin 1 rolls over and a load (side load) is applied to the roof rail 22 from the side thereof, which is hardly damaged (stress is low).

  The roof-side structural member 2 may be configured in a frame shape by bending one pipe and connecting its start and end by welding. Also in this case, the connection portion by welding between the start end and the end of the pipe is approximately the center of the front header 21 (position of the connection portion 26) or approximately the center of the rear header 23 (of the connection portion 26) for the reason described in the previous paragraph. Position).

(Floor side structural member 3)
The floor-side structural member 3 includes a front cross member 31 disposed in the vehicle width direction, a side member 32 disposed in the vehicle length direction from both ends of the front cross member 31, and a rear end of the side member 32. A rear cross member 33 that is connected and disposed in the vehicle width direction is configured in a frame shape. The floor-side structural member 3 is configured in a frame shape by bending the two pipes 34 and 35 and connecting them by welding. The connecting portion 36 formed by welding the pipes 34 and 35 is disposed at approximately the center of the front cross member 31 and approximately the center of the rear cross member 33. This is because these places are the parts that are most unlikely to be damaged (the stress is low) when the cabin 1 rolls over and a load (side load) is applied from the side.

  The floor-side structural member 3 may be formed in a frame shape by bending one pipe and connecting its start and end by welding. Also in this case, the connection portion by welding between the start end and the end of the pipe is approximately the center of the front cross member 31 (position of the connection portion 36) or the center of the rear cross member 33 (connection portion) for the reason described in the previous paragraph. 36 position).

(Cabside structural member 4)
The floor side structural member 2 and the roof side structural member 3 are connected to each other by a cab side structural member 4 by welding. The cab side structural member 4 includes front and rear pillars (a front pillar 41 and a rear pillar 42) that are spaced apart in the vehicle length direction. The front pillar 41 and the rear pillar 42 are made of a pipe material. The front pillar 41 has an upper end welded to the roof rail 22 of the roof side structural member 2 and a lower end welded to the side member 32 of the floor side structural member 3. The rear pillar 42 has an upper end welded to the roof rail 22 of the roof side structural member 2 and a lower end welded to the side member 32 of the floor side structural member 3.

(Action / Effect)
According to the present embodiment, the roof-side structural member 2 and the floor-side structural member 3 constituting the skeleton of the cabin 1 of the construction machine are respectively bent by connecting two pipes by welding, Alternatively, it is configured by bending one pipe and welding its start and end. For this reason, the number of welding locations is significantly reduced as compared with the conventional example shown in FIG. 2, and the cost can be reduced, and the product accuracy, reliability, and rigidity can be improved.

  That is, two pipes (24, 25) and (34, 35) that have been bent are formed in a frame shape rather than welding a plurality of pipes 5x and connecting them in a frame shape as in the conventional example shown in FIG. It is cheaper to make a weld connection to the pipe or to bend and connect one pipe to the start end and the end. The pipe bending cost using a pipe bender is cheaper than the welding cost using a welding machine. In the case of welding using a welding machine, it is necessary to perform downward welding in order to ensure the quality of the welded part, and it must be changed by inverting the posture of the workpiece according to the welding location, which is cumbersome and expensive. However, there is no such inconvenience in the case of pipe bending using a pipe bender.

  Since the roof-side structural member 2 and the floor-side structural member 3 of the present embodiment have only two or one welded portions of the pipe, there are a large number of welding distortions occurring in each welded portion as in the conventional example shown in FIG. There is no accumulation and product accuracy is improved. Moreover, since there are few welding locations, the possibility of poor welding is reduced and reliability is improved. Furthermore, when attaching an outer plate, glass, or the like on the surface of the welded portion, it is necessary to cut the weld bead with a grinder, but the number of cutting steps can be reduced.

  When two bent pipes (24, 25), (34, 35) are welded and connected in the shape of a frame, it is more difficult to bend and connect one pipe to its start and end. Since the pipe bending workability by the pipe bender is improved, the production becomes easy. Further, in the process of assembling the two pipes (24, 25) and (34, 35), the variation in bending accuracy of each pipe can be absorbed by pressing each pipe using a jig.

  As shown in FIG. 3, the bent portion 6 formed by bending a pipe has higher rigidity than the corner 6x formed by welding the pipe 5x as in the conventional example shown in FIG. The necessity of providing a reinforcing gusset 7x (see FIG. 2) on the inside of the interior of the housing is reduced. Therefore, weight reduction and cost reduction can be promoted while ensuring rigidity.

(Second Embodiment)
A cabin 1a of a construction machine according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the skeleton of the cabin 1a. In the cabin 1a, the roof-side structural member 2 and the floor-side structural member 3 are the same as the cabin 1 of the first embodiment shown in FIG. 3, and the cabside structural member 4a is different from the first embodiment. Therefore, the same components (floor side structural member 2 and floor side structural member 3) as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted, and the cab side structural member 4a will be described.

  The cab side structural member 4a of the cabin 1a according to the second embodiment is configured by connecting upper ends of front and rear pillars (front pillar 41a, rear pillar 41a) spaced apart in the vehicle length direction by a top rail 43a. ing. The cab side structural member 4a is formed by bending one pipe into an inverted U shape. The top rail 43a of the cab side structural member 4a is attached to the roof rail 22 of the roof side structural member 2 by welding, and the lower end of the front pillar 41a and the lower end of the rear pillar 42a are attached to the side member 32 of the floor side structural member 3 by welding. It has been.

  According to the second embodiment, the cab side structural member 4 a is formed by bending one pipe into an inverted U shape, and the top rail 43 a is welded to the roof rail 22 of the roof side structural member 2. Therefore, the overall rigidity is improved as compared with the first embodiment. Since the basic operation and effects of the second embodiment are the same as those of the first embodiment, description thereof is omitted.

(Third embodiment)
A cabin 1b of a construction machine according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5 shows the skeleton of the cabin 1b. The cabin 1b has the same roof side structural member 2 and floor side structural member 3 as the cabins 1 and 1a of the first and second embodiments described above, and the cab side structural member 4b has the first and second cab side structural members 4b. It is different from the embodiment. Therefore, the same constituent elements (the roof side structural member 2 and the floor side structural member 3) as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted, and the cab side structural member 4b will be described.

  The cab side structural member 4b of the cabin 1b according to the third embodiment has a top that connects the front and rear pillars (front pillar 41b, rear pillar 42b) spaced apart in the vehicle length direction and the upper ends of the pillars 41b, 42b. The rail 43b and the floor rail 44b connecting the lower ends of the pillars 41b and 42b are configured in a frame shape. The cab side structural member 4b is formed in a frame shape by bending two pipes 45 and 46 into a substantially U shape and connecting them by welding. The connection part 47 by welding of the pipes 45 and 46 is arrange | positioned in the approximate center of the top rail 43b, and the approximate center of the floor rail 44b. The top rail 43b is overlapped and welded to the roof rail 22 of the roof side structural member 2, and the floor rail 44b is overlapped and welded to the side member 32 of the floor side structural member 3, and the cabin 1b rolls over and loads from the side. This is because when the (side load) is applied, the approximate center of the top rail 43b and the approximate center of the floor rail 44b have the highest strength and are not easily damaged.

  The cab side structural member 4b may be formed in a frame shape by bending one pipe and connecting its start and end by welding. Also in this case, the connection portion by welding of the start end and the end of the pipe is approximately the center of the top rail 43b (position of the connection portion 47) or the substantially center of the floor rail 44b (the connection portion 47). Position).

  According to the third embodiment, the cab side structural member 4b is formed by welding two pipes 45, 46 bent into a substantially U shape, or bending one pipe and starting the end thereof. Since the end rail is welded to the frame, the top rail 43b is welded to the roof rail 22, and the floor rail 44b is welded to the side member 32. Therefore, the overall rigidity is further improved compared to the second embodiment. To do. The basic functions and effects of the third embodiment are the same as those of the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
A cabin 1c of a construction machine according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows the skeleton of the cabin 1c. Compared with the cabin 1a of the second embodiment described above with reference to FIG. 4, the cabin 1c has the same floor side structural member 3 and cab side structural member 4a as the second embodiment, and the roof side structural member 2c. Is different from the second embodiment. Therefore, the same constituent elements (floor side structural member 3 and cab side structural member 4a) as those in the second embodiment are denoted by the same reference numerals and description thereof is omitted, and the roof side structural member 2c will be described.

  The roof-side structural member 2c of the cabin 1c according to the fourth embodiment is a bend between the front pillar 41a and the top rail 43a of the cabside structural member 4c formed by bending one pipe into an inverted U shape. The front pipe 27 is welded to the outer surface of the portion 48, and the rear pipe 28 is welded to the outer surface of the bent portion 49 of the rear pillar 42a and the top rail 43a of the cab side structural member 4a. The front pipe 27 constitutes the front header 21 and the front portion of the roof rail 22, the rear pipe 28 constitutes the rear header 23 and the rear portion of the roof rail 22, and the top rail 43a of the cab side structural member 4c constitutes the middle portion of the roof rail 22. To do. The basic functions and effects of the fourth embodiment are the same as those of the first embodiment, and a description thereof will be omitted.

(Fifth embodiment)
A cabin 1d of a construction machine according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 shows the skeleton of the cabin 1d. The cabin 1d includes a roof-side structural member 2d formed by welding two pipes, a floor-side structural member 3d formed by welding two pipes, and a roof-side structural member 2d and a floor-side structural member 3d. And a cabside structural member 4d composed of three pillars connecting the two.

  The roof-side structural member 2d includes a roof first pipe 29 that is bent into a U shape in plan view so as to form a front header 21 and left and right roof rails 22, and a roof first pipe 29 that forms a rear header 23. It is comprised in frame shape from the roof 2nd pipe 20 welded to the rear both ends. 3 d of floor side structural members are the floor 1st pipe 37 bent so that the front cross member 31 and the left and right side members 32 may be comprised, and the rear part both ends of the floor 1st pipe 37 so that the rear cross member 33 may be comprised. The welded floor second pipe 38 is formed in a frame shape. The cab side structural member 4d includes a front pillar 41d, a center pillar 43d, and a rear pillar 42d, each having an upper end welded to the roof rail 22 and a lower end welded to the side member 32. The rear pillar 42d is It is disposed between the lower surface rear end and the upper surface rear end of the side member 32.

  According to the fifth embodiment, the position of the rear pillar 42d can be retracted to the position of the rear corner R (the rear corner of the roof-side structural member 2d and the floor-side structural member 3d: substantially right angle). An outer plate or glass can be attached along the side surface of the rear pillar 42d and the side surface of the rear pillar 42d. When glass is attached to the side surfaces of the corner portion R and the rear pillar 42d, flat glass can be used, and distortion of the field of view due to curved glass can be avoided. For example, in the case of the first embodiment shown in FIG. 3, when glass is assembled along the bent portion 6 of the bent pipe, curved glass is used and distortion of field of view occurs, but in this embodiment, flat glass is used. Since it can be used, there is no distortion of the field of view. Also, flat glass is less expensive than curved glass. The basic functions and effects of the fifth embodiment are the same as those of the first embodiment, and thus description thereof is omitted.

(Sixth embodiment)
A construction machine cabin 1e according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 8 shows the skeleton of the cabin 1e. The cabin 1e has the same components as those of the cabin 1 of the first embodiment shown in FIG. 3, and in addition to the bent portion 6 on the outer surface of the bent portion 6 of the pipe constituting the roof side structural member 2e. Both the pipes connected to the bent portion 6 are welded, and the pipes connected to the bent portion 6 are extended to the outer surface of the bent portion 6 of the pipe constituting the floor side structural member 3e. The floor-side bent protruding portion 62 thus protruded is welded.

  Further, a pillar (rear pillar 42e) that bridges the roof-side bent protrusion 61 and the floor-side bent protrusion 62 is welded to the rear roof-side bent protrusion 61 and the side rail 32. A bridge pillar (front pillar 41e) is welded. A center pillar 43e is welded between the pillars 41e and 42e by connecting the roof rail 22 and the side member 32 to each other.

  According to the sixth embodiment shown in FIG. 8, as compared with the first embodiment shown in FIG. 3, the position of the front pillar 41e can be advanced, and the position of the rear pillar 42e can be retracted. Therefore, the distance between the front and rear pillars 41e and 42e is increased, and the opening area of the door D (see FIG. 1) can be increased to improve the boarding / alighting performance. In addition, the sixth embodiment also has the same operations and effects as the fifth embodiment shown in FIG.

(Other)
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the claims. Needless to say, examples and modifications also belong to the technical scope of the present invention.

  For example, the cross-sectional shape of the pipe constituting the roof side structural member (2, 2a to 2e), the floor side structural member (3, 3a to 3e) and the cab side structural member (4, 4a to 4e) in each of the above-described embodiments. As shown in the drawings of each embodiment, the shape is not limited to a square, and may be a round shape, or may have a cross section other than a square or a round shape. In each embodiment described above, a square pipe having a side of about 100 mm and a plate thickness of about 5 mm is used.

  INDUSTRIAL APPLICABILITY The present invention can be used for a skeleton of a construction machine cabin.

DESCRIPTION OF SYMBOLS 1 Cabin 2 Roof side structural member 3 Floor side structural member 4 Cab side structural member 21 Front header 22 Roof rail 23 Rear header 24 Pipe 25 Pipe 26 Connection part 31 Front cross member 32 Side member 33 Rear cross member 34 Pipe 35 Pipe 36 Connection part 41b Pillar (front pillar)
42b Pillar (Riya Pillar)
43b Top rail 44b Floor rail 45 Pipe 46 Pipe 47 Connection part 6 Bending part 61 Roof side bending protrusion part 62 Floor side bending protrusion part 41e Pillar (front pillar)
42e pillar (rear pillar)

Claims (5)

  At least one of the roof side structural member, the floor side structural member, and the cab side structural member constituting the skeleton of the cabin of the construction machine is formed by bending one pipe and welding its start and end. Alternatively, a construction machine cabin characterized in that it is configured in a frame shape by bending at least one of two pipes and connecting them by welding.   The roof side structural member includes a front header disposed in the vehicle width direction, a roof rail disposed in the vehicle length direction from both ends of the front header, and a rear end of the roof rail connected to each other in the vehicle width direction. And a rear header disposed on the frame, and by bending the two pipes and connecting them by welding, a frame-like configuration is formed. The cabin of a construction machine according to claim 1, wherein the cabin is disposed on a rear header.   The floor side structural member connects a front cross member disposed in the vehicle width direction, a side member disposed in the vehicle length direction from both ends of the front cross member, and a rear end of the side member. And a rear cross member disposed in the vehicle width direction, and bending the two pipes and connecting them by welding. The cabin of a construction machine according to claim 1 or 2, wherein the cabin is disposed on a member and the rear cross member.   The cab side structural member has front and rear pillars spaced in the vehicle length direction, a top rail that connects the upper ends of the pillars, and a floor rail that connects the lower ends of the pillars, and two 4. The pipe according to claim 1, wherein the pipes are bent and connected to each other by welding, and a connecting portion formed by welding the pipes is disposed on the top rail and the floor rail. The construction machine cabin described in 1. The roof-side structural member and the floor-side structural member constituting the skeleton of the cabin of the construction machine each bend one pipe and weld its start and end, or at least one of the two pipes It is constructed in a frame shape by bending and connecting them by welding,
A roof-side bent protrusion protrudes from the outer surface of the bent portion of the pipe constituting the roof-side structural member, and a floor-side bent protrusion protrudes from the outer surface of the bent portion of the pipe constituting the floor-side structural member. Set up
A cabin of a construction machine comprising a pillar that bridges the roof-side bent protrusion and the floor-side bent protrusion.

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