JP2010270557A - Support structure of cab in construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure having strength enough to prevent dropping-off of a cab 6 when an excessive load acts on the cab 6 due to turnover of a hydraulic shovel 1 or the like. <P>SOLUTION: A front strut 9 and a front lower beam member 16 are reinforced by welding a frame reinforcing member 19 having a portal sectional shape therebetween, and a first support member 20 extending through the cylindrical front lower beam member 16 is made rigid by welding it to the front lower beam member 16 and the frame reinforcing member 19 respectively. Further, a machine frame 5 is integrated to the first support member 20 by allowing a flange-like part 21b to abut on a collar part 21a from the lower side of the machine frame 5 with a collar part 21a penetrating through the machine frame 5 in contact with the lower end of the first support member 20, and screwing a bolt 22 to the first support member 20 through the flange-like part 21b and the collar part 21a. Thus, the flange-like part 21b abuts on the machine frame 5 upon action of a load to drop off the cap 6, whereby the cab 6 is supported not to drop off. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technical field of a cab support structure in a construction machine such as a hydraulic excavator or a wheel loader.

In general, some construction machines such as hydraulic excavators have a cab mounted on the fuselage frame. In this case, to improve the operator's workability (livability) in the cab, the cab is mounted on a rubber mount or viscous mount. It is supported on the fuselage frame through such anti-vibration mounts. By the way, when an excessive load is applied to the cab due to the aircraft equipped with the cab falling down, the load exceeding the limit load may be applied to the anti-vibration mount. There is a risk that the cab will fall off the fuselage frame.
In order to avoid this, the bolts welded to the fuselage frame are passed through the cab floor plate (floor plate) in a loose-fitting manner, and a nut is fixed to the upper end of the pier with a gap from the floor plate. It is known that a nut can come into contact with a floor plate before the cab breaks to prevent the cab from falling off from the machine frame (see, for example, Patent Document 1).

JP 2001-193103 A

  However, in the above-mentioned conventional one, since the bolt penetrates the floor plate, not only the effective area of the floor plate is reduced and the comfortability in the cab is impaired, but the floor plate is flat. Because it is made of wood, it is weak in strength and needs to be reinforced separately with a reinforcing material, but when reinforcing the floor plate, attaching the reinforcing material to the upper surface (cab inner surface) of the floor plate is the smoothness of the floor plate In this case, it is difficult to secure a wide mounting space, and as a result, reinforcement using a steel-shaped steel material having excellent strength is difficult. Difficult, at best, the flat plate material is only applied to the floor plate for reinforcement. Hard to be a small area to ensure together sufficient supporting strength, there is a problem that, there is a problem to be solved by the present invention herein.

The present invention was created in order to solve these problems in view of the above circumstances, and the invention of claim 1 uses the column material and the lower beam material as part of the frame material. In a construction machine in which a cab formed with a frame is mounted on an airframe frame via a vibration isolation mount, a first support member having the lower beam material penetrated is welded to the lower beam material, while The upper end surface of the second support member is abutted against the end surface in a state of vertically passing through the body frame, and the first and second support members are fixed to each other via a bolt inserted from the lower end surface of the second support member. In addition, the second support member has a hook-shaped portion of a size that can be prevented from being removed from the through hole of the second support member formed in the body frame, and a gap is formed on the lower side of the body frame when the cab is mounted. It is characterized by being provided as A supporting structure of the cab in a construction machine according to claim Rukoto.
In the invention of claim 2, a frame reinforcing material is incorporated and welded to a corner portion formed between the pillar material and the lower beam material, and the first support member is attached to the frame reinforcing material assembling portion of the lower beam material. 2. The cab support structure in a construction machine according to claim 1, wherein the cab support structure is welded to a frame reinforcing material.
The invention according to claim 3 is characterized in that the frame reinforcing member includes a pair of plate members facing each other with a gap, and the first support member is welded to at least one plate member of the frame reinforcing material. 2. The cab support structure in the construction machine according to 2.
The invention of claim 4 is characterized in that a concave groove is formed in a frame reinforcing material welding portion of the lower beam material, and the upper through portion of the first support member is fitted and welded to the concave groove. Item 4. A cab support structure in a construction machine according to Item 2 or 3.
According to the invention of claim 5, the frame reinforcing material is a right-angled triangular plate material having a cross-sectional shape with open ends of both the lower beam material and the column material, and the frame reinforcing material of the first support member 5. The cab support structure in a construction machine according to claim 2, wherein the welding position is a position biased to an acute apex abutted against a lower beam member of the frame reinforcing member. is there.
The invention of claim 6 is characterized in that the lower beam material is a cylindrical material having upper and lower plates, and the first support member is welded to the upper and lower plates of the lower beam material, respectively. The cab support structure in the construction machine according to claim 1.
The invention of claim 7 is characterized in that the second support member includes a collar member that penetrates the through hole of the fuselage frame, and the collar member is abutted against the hook-shaped portion and the first support member. A cab support structure in a construction machine according to any one of claims 1 to 6.

According to the first aspect of the present invention, the strong lower beam member can be used as a support member for preventing the cab from falling off, and the support position is not the floor plate portion but the lower beam member position. There is no loss of comfort in the cab, and the thing that keeps it from the fuselage frame is a saddle-like part instead of a nut. The cab can be prevented from falling off.
According to the invention of claim 2, the frame reinforcing member for reinforcing the space between the column member and the lower beam member is integrated with the first support member to be rigid, and support for preventing the cab from falling off. The strength can be further increased without involving the floor plate.
According to the invention of claim 3, the first and second support members for supporting the prevention of the cab from falling off are a frame reinforcing material made of a pair of plate materials, and a column material firmly reinforced by the frame reinforcing material. As a result of being integrated with the lower beam material, a further increase in strength can be achieved.
According to the fourth aspect of the present invention, the strength of the integration of the first support member and the frame reinforcing material is further increased, and the cab dropout prevention support is further enhanced.
According to the fifth aspect of the present invention, the frame reinforcing member has a cross-sectional shape and the strength is increased, and the welding position between the first supporting member and the frame reinforcing member is a position biased to the acute apex. Further, it becomes a place close to the ceiling plate surface across which both plate surfaces of the frame reinforcing material are passed, and further rigidity can be achieved.
By setting it as invention of Claim 6, the 1st support member will be welded to the upper and lower plates of the cylindrical lower beam material, and can achieve further rigidity.
By setting it as invention of Claim 7, the structure of a 2nd supporting member is simplified.

1 is an overall side view of a hydraulic excavator. It is a perspective view which shows the framework state of a cab. It is a fragmentary perspective view of a body frame. It is a fragmentary longitudinal cross-section which shows the support site | part of a cab. It is a fragmentary longitudinal cross-section which shows the fall-off prevention state of a cab. It is a fragmentary sectional perspective view which shows the support part of a cab.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a hydraulic excavator which is one of construction machines. The hydraulic excavator 1 is configured such that a crawler-type lower traveling body 2 and a revolving upper body 4 provided with a bucket-type work attachment 3 are freely rotatable. Is provided. The body frame 5 of the upper swing body 4 is mounted with a cab 6 to be described later to protect the driver's seat 6a on one side of the front half, an engine room 7 is provided in the rear half, and a counterweight 8 is located at the rear end Any of the above is the same as in the prior art.

The cab 6 includes a pillar material 9 at the front left and right corner portions, a pillar material 10 at the rear left and right corner portions, a left and right upper beam material 11 supported between upper ends of the pillar materials 9 and 10, and a front upper beam. Material 12, rear upper beam material 13, lower left beam material 14 supported between lower ends of column materials 9, 10, lower right beam material 15, front lower beam material 16, rear lower beam material 17, etc. It is also conventional that a frame is formed using various members as a frame material, and that each space portion thus framed is configured by incorporating necessary members such as a plate material, a window material, and a door.
The floor plate 6b of the cab 6 is supported by a cab mounting seat 5a formed on the body frame 5 via a vibration-proof mount 18. The support structure is already known in, for example, Japanese Patent Application Laid-Open No. 2006-168449. It is sufficient to adopt the technology, and details thereof are omitted. In the figure, 18a is a bolt for fixing the vibration-proof mount 18 to the floor play 6b.

  Reference numeral 19 denotes a right-angled triangular frame reinforcing member having a cross-sectional shape. The frame reinforcing member 19 includes opening edge portions 19a and 19b formed on both sides of the right-angled portion with the front column 9 and the front lower side. The front strut 9 and the front lower beam member 16 are reinforced by being welded while being abutted against an inner angle (right angle) surface portion formed by the beam member 16.

The front lower beam member 16 is formed integrally with the front plate 16a, the upper plate 16b, and the lower plate 16c in a deformed cylindrical shape, and consideration is given to increase the strength. The rear cylinder 16d has a small vertical space and a rear cylinder 16e which is larger on the upper side than the front cylinder 16d and is fixed by abutting the frame reinforcing member 19 on the upper surface. In the upper and lower plates of the portion 16e, a through hole 16f is provided at an intermediate position in the left-right direction of the opening edge portion 19b of the frame reinforcing member 19 (in this embodiment, an intermediate position biased to the acute angle apex inside the left and right direction of the frame reinforcing member 19). , 16g are drilled, and the first support member 20 having a rod shape (columnar shape in the present embodiment) is passed through the through holes 16f, 16g, and is fixed to the upper and lower plates of the rear cylinder portion 16e by welding. The upper through hole 1 of the first support member 20 Through portion 20a which penetrates from f it is then fitted in the groove portion 19d formed cutout in the front side plate 19c of the frame reinforcing member 19 is integrated with the frame reinforcement 19 by welding.
In this embodiment, the cab 6 is supported to prevent the cab 6 from falling off at one place on the front left side of the cab where the entrance door is located. However, the support is not limited to this and is suitable for an appropriate position if necessary. Several locations can be implemented.

21 is a second support member. The second support member 21 is provided in a cylindrical shape with a collar portion 21a and a lower end of the collar portion 21a so as to correspond to the cylinder of the collar portion 21a. It is comprised from the bowl-shaped part 21b in which the hole 21c was formed. In the present embodiment, the collar portion 21a and the bowl-shaped portion 21b are separately formed, but it is needless to say that they may be integrated by welding or the like.
On the other hand, the first support member 20 is provided with a screw hole 20b with the lower end opened, and the second support member 21 is formed in the body frame 5 and has a smaller diameter than the flange-shaped portion 21b. The collar 5a is penetrated from the lower side through the hole 5b and the upper end surface of the collar portion 21a is abutted against the lower end surface of the first support member 20. In this state, the hook-shaped portion 21b further projects against the lower end of the collar portion 21a. The first and second support members 20 and 21 are integrated by screwing and fixing the bolt 22 inserted through the through hole 21c formed in the hook-shaped portion 21b into the screw hole 20b of the first support member 20. Is done.
In this state, a gap S is formed between the bowl-shaped portion 21b and the body frame 5 within a range that does not impair the vibration isolation function of the vibration isolation mount 18. When a large load is applied and the front column 9 moves upward and the cab 6 tilts, the hook-shaped portion 21b comes into contact with the fuselage frame 5 from the lower side to prevent the cab 5 from falling off. It is supposed to be.

  In the embodiment for carrying out the present invention configured as described above, an operator who rides on a hydraulic excavator is protected in a comfortable state by the cab 6 supported via the vibration isolation mount 18. In the case where an excessive load is applied to the cab 6 due to the airframe toppling and the cab 6 is tilted and a load in the direction in which the front support column 9 is lifted, the first and second support members 20 and 21 are connected to the front support column. 9 and the hook-like portion 21b hits against the body frame 5 from the lower side to prevent further lifting, thereby preventing the front column 9 from falling off and protecting the operator. It will be.

Thus, in the embodiment in which the present invention is implemented, the cab 6 can be supported to prevent the cab 6 from falling off. The first and second support members 20 and 21 for preventing the cab 6 from falling off can be used as in the prior art. The floor plate 6b is not located on the floor plate 6b but is provided on the strong front beam member 16 so that it is not necessary to reinforce the floor plate 6b one by one, and the support member does not protrude from the floor plate 6b. The living space in 6 is not narrowed and the smoothness of the floor plate 6b is not impaired.
In addition, since the hook-shaped portion 21b hits against the body frame 5, it is prevented from falling off. Therefore, if the hook-shaped portion 21b is enlarged as necessary, sufficient strength can be increased.

In addition, since the first support member 20 is welded to the frame reinforcing member 19 provided to reinforce the front column 9 and the front lower beam member 16, the front column 9, the front lower beam member 16, and The frame reinforcing member 19 becomes a rigid structure integrated with the first support member 20, and the strength can be further increased. Further, in this structure, the frame reinforcing member 19 has a right triangle shape and has a cross-sectional shape with a pair of front and rear plate members with a gap therebetween, so that the reinforcing strength is excellent. However, the frame reinforcing member 19 is formed on the front plate member 19c. Since the upper end portion 20a penetrating from the front lower beam member 16 of the first support member 20 is fitted and welded to the recessed groove 19d, the first support member 20 and the frame reinforcement member 19 can be highly integrated. As a result, a further increase in strength can be achieved.
In addition, in this case, the fixing position of the first support member 20 and the frame reinforcing member 16 is a position where the frame reinforcing member 16 is abutted against the front lower beam member 16 and is biased to the sharp apex having excellent strength. Therefore, even here, further increase in strength can be achieved.

  In this case, the front lower beam member 16 has a cylindrical shape, and the first support member 20 is welded to the peripheral edges of the holes in a state of penetrating through holes 16f and 16g formed on the upper and lower sides of the front lower beam member 16. Therefore, the first support member 20 is fixed to the front lower beam member 16 with a high strength, and a further increase in strength can be achieved.

  In addition, in this structure, the second support member 21 is composed of the collar portion 21a and the collar portion 21b, but these are configured to abut each other, so by changing the length of the collar member 21a, It is convenient to be able to cope with minor changes such as changing the vibration-proof mount 18.

  INDUSTRIAL APPLICABILITY The present invention can be used for supporting the prevention of falling off of a cab having high strength in a construction machine such as a hydraulic excavator or a wheel loader.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 5 Airframe frame 5a Through-hole 6 Cab 9 Front pillar material 16 Front lower beam material 16f, 16g Through-hole 18 Anti-vibration mount 19 Frame reinforcement material 19d Groove 20 First support member 20a Upper end surface 20b Screw hole 21 Second Support member 21a Collar portion 21b Hook-shaped portion

Claims (7)

  In a construction machine in which a cab formed by using a pillar material and a lower beam material as a part of a frame material is mounted on an airframe frame via a vibration isolation mount, a first support member that penetrates the lower beam material is provided. While welding to the lower beam material, the upper end surface of the second support member is abutted against the lower end surface of the first support member in a state of vertically passing through the body frame, and the first and second support members are A hook-shaped portion that is fixed through a bolt inserted from the lower end surface of the second support member, and that is secured to the second support member from the through hole of the second support member formed in the body frame. However, the cab support structure in a construction machine is characterized in that the cab is mounted so that there is a gap below the fuselage frame in the cab mounted state.   A frame reinforcing material is assembled and welded to a corner portion formed between the column material and the lower beam material, and the first supporting member is penetrated into the frame reinforcing material incorporating portion of the lower beam material to form a frame reinforcing material. The cab support structure in a construction machine according to claim 1, wherein the cab support structure is welded.   The cab in a construction machine according to claim 2, wherein the frame reinforcing member includes a pair of plate members facing each other with a gap therebetween, and the first support member is welded to at least one plate member of the frame reinforcing member. Support structure.   4. The construction according to claim 2, wherein a groove is formed in a frame reinforcing material welding portion of the lower beam member, and the upper through portion of the first support member is fitted and welded to the groove. Support structure of the cab in the machine.   The frame reinforcing member is a right-angled triangular plate member having a cross-sectional shape with an opening at both abutting edges of the lower beam member and the column member, and the welding position of the first supporting member with the frame reinforcing member is The cab support structure in a construction machine according to any one of claims 2 to 4, wherein the cab support structure is a position biased to an acute angle apex that is abutted against a lower beam member of the frame reinforcing member.   6. The construction machine according to claim 1, wherein the lower beam member is a cylindrical member having upper and lower plates, and the first support member is welded to the upper and lower plates of the lower beam member. Support structure of cab.   7. The second support member according to claim 1, wherein the second support member includes a collar member penetrating the through hole of the body frame, and the collar member is abutted against the hook-shaped portion and the first support member. The cab support structure in any one of the construction machines.

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