JP2002104238A - Cabin of mini-hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cabin of a mini-hydraulic shovel capable of being fixed, with a sufficient strength, to a turning body of which an arrangement area is restricted by various restrictions. SOLUTION: A fixing position of the cabin 10 is made to four points, i.e., a first fixing position 10I, e.g. a base part of a left front pillar 10a or a surrounding part thereof; a second fixing position 10j, e.g. a base part of a left rear pillar 10b or a surrounding thereof; a third fixing position 10k on a frame connecting a base part of the left front pillar 10c and a left intermediate pillar 10d; and a fourth fixing position 101, between the second fixing position 10j and a base part of the left rear pillar 10e, of a frame 10h connecting a base part of a right rear pillar 10d and a base part of the left rear pillar 10e. A reinforcement member is used for at least one part of the frame of the cabin 10 to enhance a rigidity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cabin of a hydraulic excavator, and more particularly to a cabin suitable for a mini excavator of 6 tons or less.

[0002]

2. Description of the Related Art Conventionally, a cabin of an ultra-small turning mini-hydraulic excavator is configured as described in, for example, JP-A-2000-96621. This configuration will be described with reference to FIGS. Mini excavator is a traveling body 5
0, the earth discharging plate 51 connected to the traveling body 50, and the traveling body 5
A revolving structure 52 rotatably mounted on the revolving structure 0;
It is composed of a cabin 53, an engine cover 54, a mud cover 55, and a counterweight 56 arranged above.

The cabin 53 of the mini-hydraulic excavator has a floor 57 formed in a square or a pentagon with a chamfered concave front left portion. The floor 57 of the cabin 53 has left and right crawler belts constituting the traveling body 50 during turning. It is configured to fit within 58 widths. For this reason, in the prior art, fixed positions are arranged at four places of the right front part 59, the left front part 60, the right rear part 61, and the left rear part 62 of the cabin 53, and the cabin 53
Was fixed.

[0004] A mini-excavator with a small rearward swing of 6t or less is configured as described in, for example, JP-A-10-331198. This configuration will be described with reference to FIGS. Mini excavator is traveling vehicle 7
0, and a revolving body 71 rotatably mounted on the traveling body 70
And a canopy 72 and a working machine 7 arranged on the revolving superstructure 71.
3, the engine cover 74, the mud cover 75, the counterweight 76, and the earth discharging plate 77 disposed in front of the traveling body 70.

[0005] In the mini excavator, the canopy 72 composed of only the roof 78 and the columns 79 for supporting the roof 78 is standard equipment. On the other hand, cabins are generally optional, and the number of cabins is small. Under such circumstances, in the mini-hydraulic shovel equipped with the canopy 72, since there is no heavy object in the front left portion of the driver's seat, as shown in FIG. Has a structure in which the left front portion 81 is largely missing.

[0006]

The above-mentioned prior art mini-hydraulic shovel has the following problems. In mini excavators, the structure of the main frame of the revolving superstructure is not designed considering the installation of the cabin because the number of cabin applications is small, so if the cabin is installed on the main frame, the left front of the cabin The portion protrudes more than the revolving superstructure, and this left front portion cannot be fixed to the main frame.

Further, even when a bracket is arranged on the left front portion of the main frame of the revolving structure to form a floor surface, and the cabin is fixed to the bracket, if the amount of protrusion from the main frame is large, the bracket is not moved. The rigidity is reduced and the fixation is insufficient, whereby the rigidity of the cabin is reduced and the load on the cabin is increased.

Further, in models such as the ultra-small turning machine shown in FIGS. 6 and 7 and the small rear turning machine shown in FIGS. 8 and 9, the turning body is so set as to be within the width of the traveling body when turning. Since the rear end of the body is formed in an arc shape, in the case of a small model, the left rear portion of the cabin protrudes from the revolving structure, and the cabin cannot be fixed at this portion.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a mini-hydraulic shovel capable of fixing a cabin with sufficient strength to a revolving structure in which an area for arranging a cabin is limited due to various restrictions. It is intended to provide a cabin.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a traveling body, a revolving body rotatably mounted on the traveling body, a main frame as a main strength member of the revolving body, A cabin installed on the main frame, and the cabin is at least
Applies to mini excavators fixed in four places.

The feature of the structure adopted by the first aspect of the invention is that the cabin is fixed at a first fixed position at the root of the right front pillar or at the periphery of the cabin, and at the root of the right rear pillar or at the right. The second fixed position which is the periphery, the third fixed position which is between the left front pillar root and the left intermediate pillar root or the left intermediate pillar root or its periphery, and the left rear pillar root and the second fixed position Provided at four locations of the fourth fixed position between, the frame that connects the right front pillar root and the left front pillar root, the frame that connects the left front pillar root and the left middle pillar root, or The reinforcing means is provided in at least one of the frames connecting the base of the left rear pillar and the fourth fixing position.

With this configuration, when the cabin protrudes from the cabin fixable area on the main frame, the cabin can be securely fixed on the main frame at four points. In addition, the cabin can sufficiently withstand the load even when the cabin has an appropriate strength, even when the fixed position is shifted to the offset position.

A feature of the structure adopted by the invention of claim 2 is that the third fixed position in the cabin is provided substantially at the left middle pillar base, the right front pillar base, the left front pillar base, and the left front pillar base. The reinforcement means is provided in each of the frames connecting the base and the left middle pillar base.

With this configuration, the force applied to the left front pillar, which is the main strength member supporting the cabin, is reduced by the third force.
Since it can be effectively transmitted to the fixed position, the cabin can be firmly supported by the main frame. Further, the force applied to the left front pillar can be effectively distributed and transmitted to the first to fourth fixed positions via the frame constituting the lower part of the cabin.

A feature of the structure adopted by the invention of claim 3 is that the fourth fixed position in the cabin is provided at a position deviated to the center line side in the left-right direction of the cabin, and the root portion of the left rear pillar and the right rear pillar are provided. The reinforcing means is provided between the left rear pillar base and the fourth fixing position in the frame connecting the bases.

With this configuration, the force applied to the left rear pillar can be effectively transmitted to the fourth fixed position, so that the cabin can be firmly supported by the main frame.

A feature of the structure adopted by the invention of claim 4 is that the reinforcing means of the frame is constituted by a hollow reinforcing member.

With this configuration, the cabin can be made to have a lightweight frame structure, and a cabin having sufficient rigidity to withstand a load can be formed.

The feature of the structure adopted by the invention of claim 5 is a frame connecting the root of the right front pillar and the root of the left front pillar in the cabin, a frame connecting the root of the front left pillar and the root of the left middle pillar, and The reinforcing means comprising a hollow reinforcing member is provided between the left rear pillar root and the fourth fixing position in the frame connecting the left rear pillar root and the right rear pillar root.

With such a configuration, the frame constituting the cabin can be configured to be lightweight and highly rigid.

A feature of the structure adopted by the invention of claim 6 is that the frame of the right front pillar in the cabin is formed of a hollow reinforcing member, and the width of the frame in the front-back direction of the cabin is longer than in the left-right direction. It is configured as follows.

With this configuration, even if the cabin has an appropriate strength, the cabin has a sufficient strength against the load imbalance caused by the cabin being at an improperly fixed position. In addition to being able to withstand, it is possible to suppress the longitudinal vibration of the cabin that occurs during traveling.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described.
The configuration of a mini excavator having a cabin will be described with reference to FIGS.

In the drawing, reference numeral 1 denotes a traveling body, and 2 denotes a revolving body mounted on the traveling body 1 so as to be pivotable, and the rear end side is formed in an arc shape. Reference numeral 3 denotes a main frame which forms the framework of the revolving superstructure 2. On the main frame 3, an engine cover 4, an operating device 5, a driver's seat 6, a control box 7, a mud cover 8, a counterweight 9 and a cabin 10 are arranged. I have.

The main frame 3, which is a main strength member of the revolving unit 2, has a structure in which a left front portion is largely cut out, and a working device (not shown) for excavating soil and the like is provided on the front side. Are provided so as to be able to move left and right and up and down.

The cabin 10 is mounted on the main frame 3.
In order to fix the first fixed point 2a, the second fixed point 2b,
A third fixed point 2c and a fourth fixed point 2d are provided, and the cabin 10 corresponds to the first fixed point 10a at a position corresponding to the first fixed point 2a at the base of the right front pillar 10a. The second fixed position 10j at the base of the right rear pillar 10b is located at a position corresponding to the second fixed point 2b, and the third fixed position 10j at the base of the left intermediate pillar 10d is located at a position corresponding to the third fixed point 2c.
A fourth fixing position 10l is provided at a position corresponding to the fixing position 10k and the fourth fixing point 2d so as to be deviated from the base of the left rear pillar 10e toward the center line side in the left-right direction of the cabin 10, and the corresponding two are used for fastening. It is configured to be fixed by fastening each with a bolt 11.
The second fixed point 2b and the fourth fixed point 2d are connected to the support frame 3a integrally fixed to the main frame 3.
It is provided above.

With the arrangement of the first to fourth fixing positions 10i to 10l, the cabin 10 can be fixed to the main frame 3 at four positions. Further, by providing the third fixed point 2c at the base of the left intermediate pillar 10d, which is a strength member for supporting the cabin 10, the left intermediate pillar 1c is provided.
0d can be firmly fixed to the main frame 3 via the third fixing point 2c.

Further, a frame constituting the cabin 10 includes:
Among the lower front frame 10f, the lower left frame 10g, and the lower rear frame 10h (see FIG. 2 showing a state in which the cabin 10 is viewed from behind the mini excavator), the left rear pillar 10e and the fourth fixed point 2d (fourth fixed point 2d) While connecting to the fixing position 10l), a reinforcing member (reinforcing means) having a sectional structure shown in FIG.
The provision of 12 partially enhances the rigidity of the cabin 10.

With such a configuration, the right front pillar 10a
Lower front frame 1 connecting the root and the left front pillar 10c
0f, lower left frame 10g and left rear pillar 10 connecting the root of front left pillar 10c and the root of middle left pillar 10d.
e The lower rear frame 10h connecting the root portion and the right rear pillar 10b root portion can be made lightweight and rigid,
The load transmitted via the left front pillar 10c is transferred to the first fixed position 1
0i and the third fixed position 10k. Therefore, the configuration is such that the bias of the load generated in the cabin 10 due to the unevenly arranged fixed position can be absorbed by the cabin 10 having sufficient rigidity.

The lower front frame 10f connecting the base of the right front pillar 10a and the base of the left front pillar 10c in the cabin 10, the lower left frame 10g connecting the base of the left front pillar 10c and the base of the left intermediate pillar 10d, and the base of the left rear pillar 10e. The hollow shape shown in FIG. 3 described above to partially reinforce any of the portion between the left rear pillar 10e base and the fourth fixed position 101 in the rear lower frame 10h connecting the base and the right rear pillar 10b base. Instead of the reinforcing member 12 described above, a hollow reinforcing member 12 ′ shown in FIG. 4 may be used.

When the rear lower frame 10h connecting the root of the left rear pillar 10e and the root of the right rear pillar 10b is entirely made of the hollow member shown in FIG. 3 or FIG. By configuring the space between the four fixing positions 10l using a hollow member thicker than the other parts, the bending rigidity in the longitudinal direction of the rear lower frame 10h may be stronger than the other parts.

When all the frames of the cabin 10 are constructed by using the hollow reinforcing member shown in FIG. 3 or FIG. 4, the front lower portion connecting the root portion of the right front pillar 10a and the root portion of the left front pillar 10c is formed. The lower left frame 10g connecting the base of the frame 10f and the left front pillar 10c to the base of the left intermediate pillar 10d is formed by using a hollow reinforcing member that is thicker than the hollow members forming the other frames, so that the front lower frame 10f and The bending rigidity in the longitudinal direction of the lower left frame 10g may be increased.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the frame constituting the cabin 10 in the first embodiment, the right front pillar 10a has a fan-shaped cross section and a hollow reinforcing member (reinforcing means) as shown in FIG. Since the third embodiment is the same as the first embodiment, detailed description of the same parts will be omitted.

The frame made of a hollow reinforcing member constituting the right front pillar 10a is composed of straight portions 13 and 14 whose cross-sections intersect at substantially right angles, and a curved portion 15 connecting the ends of the straight portions 13 and 14. I have. And the straight part 14 located in the front-back direction of the cabin 10 is formed longer than the straight part 13 located in the left-right direction.

As described above, the right front pillar 10 of the cabin 10
a is a frame made of a hollow reinforcing member, and the straight portion 14 located in the front-rear direction of the cabin 10 is longer than the straight portion 13 located in the left-right direction.
Vibration in the front-rear direction of the cabin 10 generated when the mini excavator travels can be suppressed.

Further, with this configuration, it is possible to have sufficient rigidity against a load caused by vibration generated in the cabin 10 due to the biased fixed position between the cabin and the main frame.

In the first and second embodiments, the cabin and the main frame are fixed at four positions. However, a fixing position is added at an appropriate position other than the four positions to reduce the load acting on the cabin. It may be further dispersed and supported.

In the first and second embodiments, the positions for fixing the cabin and the main frame are the first fixing position of the right front pillar base, the second fixing position of the right rear pillar base, and the left middle pillar. Although there are at least four locations of the third fixed position of the root portion and the fourth fixed position deviated from the left rear pillar root portion to the center line side of the cabin in the left-right direction, the first provided at the peripheral portion of the right front pillar root portion. Fixed position,
A second fixed position provided around the right rear pillar base, a third fixed position provided between the left front pillar base and the left middle pillar base or around the left middle pillar base, a left rear pillar base And a fourth fixed position provided between the first fixed position and the second fixed position, and among the frames constituting the cabin, a frame connecting the right front pillar base and the left front pillar base, a left front pillar base and a left middle pillar Reinforcing members may be provided in at least one of the frames connecting the root portions or the frame connecting the left rear pillar root portion and the fourth fixing position. In this case, the same operation and effect as described above are obtained. be able to.

[0040]

As described above, according to the cabin of the mini excavator of the present invention, the area on the revolving unit is small due to various restrictions, and the revolving unit has a limited area for disposing the cabin. The cabin can be arranged with sufficient strength.

In particular, the cabin can be arranged on the revolving superstructure with sufficient strength even for small rear revolving machines and ultra-small revolving machines having a small area on the revolving superstructure.

According to the first aspect of the invention, when the cabin protrudes from the cabin fixable area on the main frame, the cabin can be securely fixed on the main frame at four points. In addition, the cabin can sufficiently withstand the load even when the cabin has an appropriate strength, even when the fixed position is shifted to the offset position.

According to the second aspect of the present invention, the force applied to the left front pillar, which is the main strength member supporting the cabin, is set to the third level.
Since it can be effectively transmitted to the fixed position, the cabin can be firmly supported by the main frame. Further, the force applied to the left front pillar can be effectively distributed and transmitted to the first to fourth fixed positions via the frame constituting the lower part of the cabin.

According to the third aspect of the present invention, the force applied to the left rear pillar can be effectively transmitted to the fourth fixed position, so that the cabin can be firmly supported by the main frame.

According to the fourth aspect of the present invention, the cabin can be made to have a lightweight frame structure, and a cabin having sufficient rigidity to withstand a load can be formed.

According to the fifth aspect of the present invention, the frame constituting the cabin can be made lightweight and highly rigid.

According to the sixth aspect of the present invention, even if the cabin has an appropriate strength, the cabin has an appropriate strength against a load imbalance in the cabin caused by an improper fixed position of the cabin. And the vibration in the front-rear direction of the cabin during traveling can be suppressed.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a developed schematic view of a mini-hydraulic shovel viewed from diagonally left front.

FIG. 2 is a rear view showing a state in which the cabin 10 shown in FIG. 1 is viewed from the rear of the mini excavator.

FIG. 3 is an enlarged sectional view showing a longitudinal sectional shape of a frame of the cabin 10 shown in FIGS. 1 and 2.

FIG. 4 is an enlarged sectional view showing another structure of the frame of the cabin 10 shown in FIG.

FIG. 5 is an enlarged cross-sectional view showing a cross-sectional shape of a frame constituting a right front pillar of the cabin shown in FIG. 1;

FIG. 6 is a front view showing a state in which a cabin is mounted on a conventional ultra-small turning mini-hydraulic excavator.

FIG. 7 is a plan view illustrating the miniature hydraulic excavator of FIG. 6;

FIG. 8 is a front view showing a state in which a canopy is mounted on a conventional mini-excavator with a small rearward turning swing.

FIG. 9 is a plan view showing a main frame configuration of the small rear swing mini-hydraulic shovel of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 2 Revolving structure 2a 1st fixed point 2b 2nd fixed point 2c 3rd fixed point 2d 4th fixed point 3 Main frame 3a Support frame 4 Engine cover 5 Operating device 6 Driver's seat 7 Control box 8 Mud cover 9 Counter weight 10 Cabin 10a Right front pillar 10b Right rear pillar 10c Left front pillar 10d Left middle pillar 10e Left rear pillar 10f Front lower frame 10g Lower left frame 10h Rear lower frame 10i First fixed position 10j Second fixed position 10k Third fixed position 10l Fourth fixed Position 11 Fastening bolt 12 Reinforcing member

Claims (6)

[Claims] A traveling body, a revolving body rotatably mounted on the traveling body, a main frame that is a main strength member of the revolving body, and a cabin installed on the main frame;
In a mini excavator in which the cabin is fixed to the main frame at at least four positions, the fixed position of the cabin is a first fixed position which is a root portion of a right front pillar constituting the cabin or a peripheral portion thereof, and a right rear pillar. A second fixed position at or near the root, a third fixed position between the left front pillar root and the left intermediate pillar root or a left intermediate pillar root or its peripheral, a left rear pillar root and a Provided at four locations of the fourth fixed position between the two fixed positions, among the frames constituting the cabin, the frame connecting the right front pillar base and the left front pillar base, the left front pillar base and the left middle pillar base Connecting frame or left rear pillar base and
(4) A cabin of a mini excavator, wherein a reinforcing means is provided in at least one of the frames connecting the fixing positions. 2. A third fixed position in the cabin,
2. The method according to claim 1, wherein the reinforcing means is provided substantially at the left middle pillar base, and each frame connecting the right front pillar base and the left front pillar base and the left front pillar base and the left middle pillar base is provided. Cabin of the described mini excavator. 3. A fourth fixed position in the cabin,
It is provided at a position deviated to the center line side in the left and right direction of the cabin, and reinforcing means is provided between the left rear pillar base and the fourth fixed position in the frame connecting the left rear pillar base and the right rear pillar base. The cabin of a mini excavator according to claim 1 or 2, wherein: 4. The cabin of a mini excavator according to claim 1, wherein said reinforcing means of said frame is constituted by a hollow reinforcing member. 5. A frame connecting the right front pillar base and the left front pillar base in the cabin, a frame connecting the left front pillar base and the left intermediate pillar base, and a left rear pillar base and a right rear pillar base. The cabin of the mini-hydraulic shovel according to claim 1, wherein a reinforcing means including a hollow reinforcing member is provided between a root portion of a left rear pillar of the connecting frame and the fourth fixing position. 6. The frame of the right front pillar in the cabin is formed of a hollow reinforcing member, and the frame width in the front-back direction of the cabin is longer than the left-right direction. The cabin of a mini excavator according to any one of claims 1 to 5.