JPH11140909A - Construction machine with cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve comfortability and operability through suppression of vibration transmitted from a frame to a cab body and to reduce a manufacturing cost through facilitation of processing and assembly of a vibration control support means. SOLUTION: A first vibration control device 18 to support the rear side of a cab body 16 comprises a bracket on the frame side mounted on the slowing frame 4 side; a bracket on the cab side mounted on the cab body 16 side, a coupling pin to couple the bracket, and a vibration control bush positioned on the outer peripheral side of the coupling pin and inserted in a fit-in state in the bracket on the cab side. Thus, vibration in a lateral direction, such as rolling and yawing, of the cab body 16 is suppressed by the first vibration control device 18. Further, since the first vibration control device 18 is decreased in the number of parts and has a simplified shape, workability and assemblability are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine with a cab, such as a hydraulic shovel, a hydraulic crane, etc. Related to construction machinery.

[0002]

2. Description of the Related Art Generally, a construction machine with an operator's cab, such as a hydraulic shovel or a hydraulic crane, is provided with an operator's cab main body provided on a frame of an upper revolving unit, and an operating cab provided between the frame and the operator's cab main body. A vibration isolating support means for supporting the cabin main body on the frame and suppressing transmission of vibration of the frame to the cab main body.

[0003] The anti-vibration support means suppresses vibration such as excavation reaction force generated during excavation work such as earth and sand and vibration during traveling from being transmitted to the cab through the frame, thereby improving the livability and operability of the cab. The operability of the operation lever and the like arranged in the room is in a good state.

[0004] An example of this type of conventional construction machine with a driver's cab is disclosed in Japanese Patent Laid-Open No. 6-108493. JP-A-6-108493 discloses an anti-vibration support comprising a coil spring compressed between a frame and a driver's cab main body, and an oil damper whose upper end is attached to the driver's cab main body and whose lower end is attached to the frame. A hydraulic excavator in which vibration of the cab body is suppressed by means is disclosed.

[0005] In this hydraulic excavator, the natural frequency of the cab body is suppressed low by setting the spring constant of the coil spring constituting the vibration isolation support means to be low, and the vibration is reduced by the vibration damping action of the oil damper. , The transmission rate of vibration from the frame to the cab body is reduced.

Further, by using a coil spring having a small spring constant, left and right vibrations of the cab main body (hereinafter, referred to as "vibrations").
The rigidity with respect to rolling (hereinafter referred to as rolling) and forward and rearward vibrations (hereinafter referred to as pitching) is reduced. Therefore, a parallel link mechanism including a torsion bar is provided between the frame and the operator's cab in order to prevent the operator's cab from tilting left and right or forward and rearward on the frame.
A configuration in which the cab body and the frame are connected by the parallel link mechanism is employed.

[0007]

In the hydraulic excavator according to the prior art described above, the rigidity of the cab body against rolling and pitching is increased by the parallel link mechanism, so that vibration during excavation work is transferred from the frame to the cab body. It becomes easy to be transmitted.

In this case, the vibration damping characteristic of the oil damper constituting the vibration isolating support means is set so as to be compatible with the coil spring having a small spring constant. The vibration transmitted to the main body is damped by the oil damper.

However, since the parallel link mechanism and the torsion bar have no function of damping vibration, it is difficult to attenuate the vibration transmitted from the frame to the cab body through the parallel link mechanism. As a result, the driver's cab main body resonates on the frame, and there is a problem that comfort in the driver's cab, operability with respect to the operation lever, and the like are impaired.

On the other hand, since a parallel link mechanism including a torsion bar is provided between the frame and the cab body,
When this parallel link mechanism and torsion bar are mounted between the frame and the cab body via connecting pins, etc.,
At the time of operation, it is necessary to mount with high parallel accuracy so that the parallel link mechanism and the torsion bar do not interfere. For this reason, there is a problem that a high processing accuracy is required when processing the parallel link mechanism and the torsion bar, and that the assembling work is troublesome, resulting in an increase in manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to efficiently suppress vibration transmitted from a frame to a driver's cab body, to improve comfort and operability, and to reduce vibration. An object of the present invention is to provide a construction machine with an operator's cab, which facilitates processing and assembling of a support means and can reduce a manufacturing cost.

[0012]

A construction machine with a cab according to the present invention is provided with a frame of a construction machine, a cab body disposed on the frame, and a space between the frame and the cab body. And vibration-proof support means for suppressing transmission of vibration from the frame to the cab body.

[0013] In order to solve the above-mentioned problems,
A feature of the configuration adopted by the invention of claim 1 is that the anti-vibration support means is provided on one side in front and rear directions of the cab main body and is provided to be separated in left and right directions, and the cab main body is provided. A first vibration isolator for elastically supporting the cab and preventing transmission of vibration to the cab main body, and being provided on the other side in front of and behind the cab main body and spaced apart in the left and right directions. A second vibration isolator that elastically supports the cab main body and prevents vibration from being transmitted to the cab main body, wherein the first vibration isolator is located on the left side of the cab main body. A connecting pin extending rightward and rotatably connecting the cab body on the frame;
And an elastic body provided on the outer peripheral side of the connection pin.

With this configuration, the vibration of the frame can be prevented from being transmitted to the cab body by the first vibration isolator and the second vibration isolator, and the vibration of the cab body can be attenuated. it can. Further, the first vibration isolator is constituted by a connecting pin extending in the left and right directions and rotatably connecting the cab body on the frame, and an elastic body provided on the outer peripheral side of the connecting pin. Thus, rolling of the cab main body can be suppressed, and the first vibration damping device can be configured with a simple configuration with a small number of components.

Further, according to a second aspect of the present invention, the first vibration isolating device is provided on the rear side of the cab body,
May be provided in front of the cab body.

Further, as in the invention according to claim 3, the anti-vibration support means includes a first anti-vibration device provided on a front side of the cab body,
The second vibration isolator may be provided on the rear side of the cab body.

According to a fourth aspect of the present invention, the connecting pin constituting the first vibration isolator is connected between the frame side bracket provided on the frame side and the cab side bracket provided on the cab body side. The elastic body is an anti-vibration bush formed in a cylinder using a material having elasticity, and the anti-vibration bush is located on an outer peripheral side of the connection pin and is provided in a pin connection hole of the cab side bracket. That is, it is configured to be inserted.

With this configuration, after the vibration isolating bush is inserted into the pin connection hole of the cab side bracket, the pin connection hole of the frame side bracket and the pin connection hole of the cab side bracket are aligned on the same axis. And in this state, insert the connecting pin into the pin connecting hole (vibration-proof bush),
By disposing the vibration isolating bush on the outer peripheral side of the connecting pin, the first vibration isolating device can be assembled.

According to a fifth aspect of the present invention, the connecting pin constituting the first vibration isolator is connected between the frame side bracket provided on the frame side and the cab side bracket provided on the cab body side. The elastic body is an anti-vibration bush formed into a cylinder using a material having elasticity, and the anti-vibration bush is located on an outer peripheral side of the connection pin and inserted into a pin connection hole of the frame-side bracket. That is, it is configured to fit.

With this configuration, after the anti-vibration bush is inserted into the pin connection hole of the frame side bracket, the pin connection hole of the frame side bracket and the pin connection hole of the cab side bracket are aligned on the same axis. Place the connector pin in this state in the pin connection hole (vibration-proof bush)
By disposing the vibration isolating bush on the outer peripheral side of the connecting pin, the first vibration isolating device can be assembled.

According to a sixth aspect of the present invention, the second vibration isolator has a spring constant smaller than that of the first vibration isolator. That is, a link mechanism for regulating the displacement in the direction is provided.

According to this structure, the rigidity of the cab main body against pitching can be reduced by the second vibration isolator. For this reason, the pitching vibration transmission rate from the frame to the cab main body can be reduced, and the pitching generated by the cab main body by the second vibration isolator can be attenuated.

By setting the spring constant of the second vibration isolator to be smaller than the spring constant of the first vibration isolator,
Vibration in the upward and downward directions (hereinafter referred to as bounce) of the cab body can be converted into pitching with the first vibration isolator having a large spring constant as a fulcrum, and this pitching can be converted into a second vibration with a small spring constant. It can be damped by a vibration device.

Further, since the spring constant of the first vibration isolator is set to be large, the first vibration isolator receives the rolling of the cab main body, so that the rolling of the cab main body due to the rolling is large. Can be prevented.

On the other hand, when vibration (hereinafter referred to as yawing) for rotating the cab main body in the horizontal direction acts,
Although the second vibration isolator having a small spring constant tends to be largely displaced, the link mechanism provided in this second vibration isolator regulates left and right displacements caused by yawing of the cab body. Yawing of the cab body can be prevented.

According to a seventh aspect of the present invention, the second vibration isolator comprises an oil damper for attenuating the vibration of the cab main body and a spring for elastically supporting the cab main body. The vibration device is provided with a link mechanism that regulates the left and right displacements of the cab body.

With such a structure, the stiffness of the cab body against pitching can be reduced by the spring of the second vibration isolator. For this reason, the vibration transmission rate of the pitching from the frame to the cab main body can be suppressed low, and the pitching generated by the cab main body due to the oil damper of the second vibration isolator can be attenuated.

Further, the bounce of the cab body can be converted into pitching with the first vibration isolator as a fulcrum,
This pitching can be attenuated by the oil damper of the second vibration isolator. Further, yawing of the cab main body can be regulated by a link mechanism provided in the second vibration isolator.

The oil damper and the spring constituting the second vibration isolator may include a frame-side support member provided on the frame side and an cab-side support member provided on the cab body side. The cab side support member is provided with an annular flange portion, and the flange portion is provided with an elastic stopper for restricting the cab body from being displaced upward and downward within a predetermined range. And that

Thus, even if the driver's cab main body has a large pitching, rolling, or bounce, the elastic stopper can prevent the second vibration isolator from being excessively deformed. Further, by using the elastic stopper, it is possible to suppress the impact when acting as the stopper.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hydraulic shovel will be described as an example of a construction machine with a cab according to an embodiment of the present invention and will be described in detail with reference to FIGS.

1 is a lower excavator of a hydraulic shovel, 2 is a swing device, 3 is an upper revolving structure mounted on the lower traveling structure 1 via a revolving device 2, and the upper revolving structure 3 has a skeletal structure. It has a revolving frame 4 as a frame to be formed.

As shown in FIGS. 2 and 3, the revolving frame 4 has a center frame 5 attached to the revolving device 2. The center frame 5 has a bottom plate 5A whose central portion is made of a thick steel plate. And a pair of vertical plates 5B, 5B (only one is shown) extending forward and backward on the bottom plate 5A. On the front left side of the center frame 5, an operator's cab support 6 for supporting an operator's cab body 16 described below from below is provided.

The driver's cab support 6 has a transverse beam 7 extending in the left and right directions from the front of the center frame 5 and having an inverted U-shaped cross section. A cross beam 8 extending rightward, a side frame 9 having a D-shaped cross section attached to the left ends of the cross beams 7, 8 and extending in front and rear directions;
And a front frame 11 extending leftward and rightward over the front end of the side frame 9 and the front end of the vertical beam 10. .

The rear cross beam 8 is connected to the center frame 5.
A support plate 8A extending in the left and right directions with a plate thickness equivalent to that of the bottom plate 5A, and an inverted U-shaped beam 8B fixed on the support plate 8A. The cab side bracket 2 of the first vibration isolator 18 described later
Rectangular through-holes 8C, 8C through which 1 penetrate are formed to be separated in the left and right directions.

Further, the front frame 11 comprises a lower plate 11A, an upper plate 1
1B, a front plate 11C and a rear plate 11D are formed in a rectangular tube shape.
Circular through hole 11 through which the driver's cab side support member 26 penetrates
E and 11E are formed to be separated from each other in the left and right directions.

The upper revolving unit 3 is provided on the revolving frame 4, a machine room 12 provided on the revolving frame 4, and on the revolving frame 4 located at the front left side of the machine room 12. A cab 13 surrounded by a cab body 16 and a turning frame 4 located in front of the machine cab 12.
A working device 14 provided to be able to move up and down at the front of the machine room 12 and a machine room 12 for balancing the weight of the working device 14.
And a counter weight 15 provided at the rear of the revolving frame 4 at the rear side.

Reference numeral 16 denotes an operator's cab main body provided on the revolving frame 4. As shown in FIG.
For example, by pressing and welding a thin steel plate, a rectangular upper surface portion 16A extending forward and backward,
A front portion 16B whose lower middle portion projects forward,
A rear surface portion 16C facing the front surface portion 16B;
And right and left side portions 16D, 16 connected to the front portion 16B.
D is formed into a box shape, and a floor plate 17 forming a part of the cab body 16 is fixed to the lower surface side via floor plate brackets 16E, 16E. Further, inside the cab main body 16, a seat on which an operator sits, an operation lever (not shown) for operating the work device 14, and the like are disposed.

Reference numerals 18 designate a first vibration isolator provided between the turning frame 4 and the cab main body 16, and this vibration isolator 18 is located behind the cab main body 16, as shown in FIG. Are provided on the left side and separated from each other in the left and right directions. Then, as shown in FIG. 5, the first vibration isolator 18 includes a frame-side bracket 19, a driver's cab-side bracket 21,
It is composed of a connecting pin 22, an anti-vibration bush 23 and the like.

Reference numeral 19 denotes a frame-side bracket mounted on the support plate 8A of the cross beam 8. The frame-side bracket 19 includes a base plate 19A and a pair of support pieces 19B, 19B erected on the base plate 19A. And the support piece 19
Bearing mounting holes 19C, 19C as pin connecting holes formed to penetrate through B, 19B, and bearings 20, 20 are inserted into the bearing mounting holes 19C, 19C.

Reference numeral 21 denotes a cab side bracket attached to the floor plate 17 of the cab body 16. The cab side bracket 21 penetrates the through hole 8 C of the cross beam 8, and a bearing of the frame side bracket 19 is provided at the tip end thereof. A bush insertion hole 21A as a pin connection hole is provided corresponding to the mounting hole 19C.

Numeral 22 penetrates through the bush insertion hole 21A of the cab side bracket 21 and has the frame side bracket 1 on both sides.
9 is a connecting pin rotatably supported in each bearing mounting hole 19C via a bearing 20. The connecting pin 22 extends in the left and right directions of the cab main body 16 and is disposed. The cab side bracket 21 is rotatably connected to the cab side.

Numeral 23 denotes an anti-vibration bush which is located on the outer peripheral side of the connecting pin 22 and is an elastic body inserted into the bush insertion hole 21A of the cab side bracket 21. Bush insertion hole 21 of side bracket 21
A, an outer cylinder 23A fitted in the inner cylinder A, an inner cylinder 23B externally fitted to the connecting pin 22, and a rubber cylinder 23C provided between the outer cylinder 23A and the inner cylinder 23B.
Is cylindrically formed of an elastic material such as a rubber material having a vibration damping action.

The first vibration isolator 18 constructed as described above
Is connected to the frame side bracket 19 via the connecting pin 22.
By connecting the cab side bracket 21 with pins,
The pitching of the transfer chamber body 16 is allowed, while the rubber cylinder 23C
The cab body 16 is formed by the vibration-isolating bush 23 made of
It regulates large rolling. Also, the first
The vibration isolator 18 is a vibration isolator according to the vibration of the cab body 16.
By elastically deforming the rubber cylinder 23C of the shoe 23,
The cab body 16 is elastically supported on the revolving frame 4.
Is what you do. Here, the first vibration isolator 18 is, for example,
If the spring constant in the upward and downward directions is 5 × 10^Five ~ 15 × 10
^Five  (N / m).

Reference numerals 24, 24 denote second vibration isolators provided between the turning frame 4 and the cab main body 16, and the second vibration isolators 24, as shown in FIG. 16 are provided on the front side of the vehicle 16 and are separated from each other in the left and right directions. Then, as shown in FIG. 7, the second vibration isolator 24
Frame-side support member 25, driver's cab-side support member 2 described below
6, an oil damper 27, a coil spring 30, and the like.

Reference numeral 25 denotes a frame-side support member mounted on the lower plate 11A of the front frame 11.
Reference numeral 5 includes a base plate 25A and a cylindrical body 25B protruding upward from the base plate 25A.

Reference numeral 26 denotes an operator's cab-side support member attached to the floor plate 17 of the operator's cab main body 16.
Is composed of a base plate 26A fixed to the floor plate 17, a cylindrical body 26B protruding downward from the base plate 26A, and a flange 26C provided with an enlarged diameter from the lower end of the cylindrical body 26B. Rubber rings 31, 32 to be described later are fixed to the flange 26C.

Reference numeral 27 denotes an oil damper provided between the frame-side support member 25 and the cab-side support member 26. The oil damper 27
And a tube 27A in which a piston (not shown) is inserted.
And a piston rod 27B projecting upward from the tube 27A on the distal end side and attached to the cab side support member 26 via a pin 29.

A lower spring support 27C is provided on the outer peripheral side of the tube 27A, and the piston rod 27B
An upper side spring support 27D is provided on the outer peripheral side of the. The oil damper 27 generates a damping force by the piston as the piston rod 27B extends and contracts with respect to the tube 27A.

Reference numeral 30 denotes a coil spring as a spring provided on the outer peripheral side of the oil damper 27.
Is compressed between the lower spring support 27C of the tube 27A and the upper spring support 27D of the piston rod 27B.
Accordingly, the coil spring 30 urges the tube 27A in a direction in which the piston rod 27B extends, and elastically supports the cab main body 16.

The spring constant of the coil spring 30 is much smaller than that of the vibration isolating bush 23 of the vibration isolating device 18 described above, and is set to, for example, about 4 × 10 ⁴ to 10 × 10 ⁴ (N / m). ing. The damping coefficient of the oil damper 27 is, for example, 2 × 10 ^{3 to} 6 × 10 ³ (N · sec / m).
Set to about.

Thus, each second vibration isolator 24 rotates the cab main body 16 with a smaller spring constant than the vibration isolator 18 by the expansion and contraction of the coil spring 30 in accordance with the vibration of the cab main body 16. In addition to being elastically supported on the frame 4, the vibration of the cab main body 16 at this time is attenuated by the oil damper 27.

Reference numeral 31 denotes a flange 26C of the cab side support member 26.
A rubber ring fixed to the lower surface. The rubber ring 31 is made of an elastic rubber material and is formed in an annular shape corresponding to the cylindrical body 25B of the frame-side support member 25. Also, 3
Reference numeral 2 denotes a rubber ring fixed to the upper surface of the flange portion 26C. The rubber ring 32 is made of the same rubber material as the rubber ring 31 and is formed in an annular shape capable of abutting on the floor plate 17 of the cab body 16.

The rubber ring 31 is brought into contact with the cylindrical body 25B of the frame-side support member 25 so that the cab body 16
The rubber ring 32 forms an elastic stopper against upward displacement of the cab body 16 by abutting against the floor plate 17 of the cab body 16. As a result, the rubber rings 31 and 32 regulate the upward and downward displacement of the cab body 16 within a predetermined range.

Reference numeral 33 denotes left and right second vibration isolators 24, 24.
With a link mechanism provided between the link mechanism 33,
It is composed of mounting brackets 34 and 35 described later, a link 36 and the like.

Reference numeral 34 denotes a mounting bracket integrally fixed to the frame-side support member 25 of the second vibration isolator 24 disposed on the right side of the cab main body 16.
One end of a link 36 is attached to 4.

Reference numeral 35 denotes a mounting bracket integrally fixed to the cab-side support member 26 of the second vibration isolator 24 disposed on the left side of the cab main body 16. The other end of 36 is attached.

Reference numeral 36 denotes a link extending between the second anti-vibration devices 24 in the left and right directions.
It is formed as a bar. And link 36
Is rotatably pin-connected to a mounting bracket 34 fixed at one end to the right frame-side support member 25,
The other end is rotatably pin-connected to a mounting bracket 35 fixed to the left cab side support member 26.

The link mechanism 33 regulates the left and right displacements of the cab main body 16 caused by the yawing when the cab main body 16 acts so as to cause yawing by the vibration from the turning frame 4. This is to prevent yawing at this time.

The hydraulic shovel according to the present embodiment has the above-described configuration. Hereinafter, an operation of suppressing vibration of the cab body 16 which is a feature of the present embodiment will be described.

First, vibrations during traveling of the lower traveling body 1 or during excavation work by the working device 14 are transmitted to the cab main body 16 through the turning frame 4, and the cab main body 16 moves forward and backward on the turning frame 4. Oscillating vibration (pitting)
Occurs, the spring constant is set smaller than that of the first vibration isolator 18 supporting the rear side of the cab body 16.
The pitching can be received with small rigidity by elastically supporting the front side of the cab main body 16 by the vibration isolator 24.

Here, it is known that the pitching of the frequency band before and after 10 (Hz) occurs most often during the operation of the hydraulic excavator. In the hydraulic excavator according to the prior art, the characteristic line A is shown in FIG. As shown by, the vibration transmissibility of pitching transmitted from the turning frame to the cab body is 1
It is maximum in the frequency bands before and after 0 (Hz). On the other hand, in the hydraulic shovel according to the present embodiment, as shown by the characteristic line B, the vibration transmission rate of the pitching transmitted from the turning frame 4 to the cab body 16 is 10 (H).
z) It can be significantly reduced in the frequency bands before and after.

As described above, the spring constant of the second vibration isolator 24 supporting the front side of the cab body 16
Is set smaller than the first vibration isolator 18 supporting the rear side of the cab main body 1 from the turning frame 4.
6 can be suppressed to a low vibration transmission rate, and the pitching of the cab body 16 can be reliably suppressed. In addition, the vibration damping effect of the oil damper 27 constituting the second vibration isolator 24 causes the cab body 16
Can be effectively attenuated.

When the driver's cab body 16 generates upward and downward vibrations (bounce), the spring constant of the second vibration isolator 24 is smaller than that of the first vibration isolator 18. In addition, the bounce of the cab main body 16 can be converted into pitching substantially using the first vibration isolator 18 as a fulcrum. Since the pitching can be buffered by the second vibration isolator 24 as described above, the bounce of the cab body 16 can be reliably prevented as a result.

Further, the cab main body 16 is
When vibration (rolling) swinging left and right is generated, the first vibration isolator 18 provided on the rear side of the cab body 16 receives the vibration with great rigidity. Therefore, a large inclination of the cab main body 16 due to the rolling at this time can be prevented.

On the other hand, when vibration (yaw) that rotates in the horizontal direction acts on the cab main body 16, the large rigidity of the first vibration isolator 18 provided on the rear side of the cab main body 16, The link mechanism 33 provided on the front side of the cab main body 16 can reliably prevent yawing of the cab main body 16.

Therefore, according to the present embodiment, compared with the first vibration isolator 18 which elastically supports the rear side of the cab main body 16, the second vibration isolator which elastically supports the front side of the cab main body 16 is provided. By setting the spring constant of the vibration device 24 small, pitching, bounce, and rolling of the cab body 16 can be suppressed. Also, the left and right second anti-vibration devices 24,
The stiffness of the link mechanism 33 and the first vibration isolator 18 provided between the cabs 24 can suppress yawing of the cab body 16.

As a result, it is possible to improve the livability in the cab 13 and the operability of the operation lever and the like provided in the cab 13, thereby improving the working environment.
Further, by reliably suppressing rolling and yawing by the first vibration isolator 18, the link mechanism 33, and the like, the left and right swinging of the cab main body 16 can be reduced, and the cab main body 16 and the working device 14 Contact can be prevented.

Further, the rear side of the cab main body 16 is connected to the first vibration isolator 18 using the connecting pins 22 and the vibration isolating bush 23.
Therefore, the configuration can be simplified in terms of the number of parts and the shape as compared with, for example, a liquid-filled rubber mount shown in Japanese Patent Application Laid-Open No. 6-108493. Further, since the link mechanism 33 does not require high parallel accuracy at the time of mounting unlike the parallel link mechanism, the processing accuracy can be reduced, the assembly workability can be improved, and the manufacturing cost of the hydraulic shovel can be reduced. .

Further, since the link mechanism 33 can be connected to the turning frame 4 side and the cab body 16 side by using the second anti-vibration devices 24, 24 located on the left and right, the link mechanism 33 is provided. Can be easily assembled, and assembling workability can be improved.

Further, rubber rings 31 and 32 serving as elastic stoppers are provided on the second vibration isolator 24, and the upper and lower displacements of the cab body 16 are restricted within a predetermined range by the rubber rings 31 and 32. Therefore, the vibration of the operator cab main body 16 can be suppressed to a small extent, so that excessive deformation of the second vibration isolator 24 can be prevented, and the life of the oil damper 27 and the coil spring 30 can be extended. Further, by using the rubber rings 31 and 32 having elasticity, the impact when acting as a stopper can be suppressed small, and the livability and the like can be improved.

In the embodiment, the first vibration isolator 18 is provided on the rear side of the cab main body 16, and the second vibration isolator 24 and the link mechanism 33 are provided on the front side of the cab main body 16. However, the present invention is not limited to this. For example, as in a first modification shown in FIG. A configuration in which the vibration device 24 and the link mechanism 33 are provided, and the first vibration isolator 18 is provided in the front frame 11 ′ on the front side may be adopted.

In the embodiment, the first vibration isolator 1
8, the case where two left and right two vibration isolators 24 are provided is illustrated, but a configuration in which three or more first and second vibration isolators 18 and 24 are provided may be employed.

In the embodiment, the first vibration isolator 1
8 is constituted by a frame side bracket 19, a driver's cab side bracket 21, a connecting pin 22, and an anti-vibration bush 23, and illustrates a case where the anti-vibration bush 23 is inserted into a bush insertion hole 21 </ b> A of the operator's cab side bracket 21. However, the present invention is not limited to this. For example, as in a second modified example shown in FIG. 10, the first vibration damping device 41 includes a frame-side bracket 42 attached to the revolving frame 4 and a driver's cab. Body 16
A cab side bracket 43 attached to the side, a connecting pin 44 inserted through the frame side bracket 42 and the cab side bracket 43, and a bush fitting hole of the frame side bracket 42 located on the outer peripheral side of the connecting pin 44. 42A, 42
B may be constituted by the anti-vibration bushes 45 and 46 inserted into B. In this case, the cab side bracket 43 is connected to the connecting pin 4 via the bearing 47 inserted into the bearing mounting hole 43A.
4 is connected rotatably.

Further, in the embodiment, the cylindrical vibration-proof bush 23 has been described as an example of the elastic body. Alternatively, for example, a semi-arc-shaped groove corresponding to the diameter of the connecting pin 22 may be used. Is provided with two laminated rubbers on which
The elastic body may be configured by sandwiching the connecting pin 22 between the laminated rubber pieces. Further, the elastic body may be constituted by three or more laminated rubbers.

In the embodiment, the second vibration isolator 2
Although 4 is constituted by the oil damper 27, the coil spring 30, and the like, for example, instead of the coil spring 30, another spring such as a plate spring or a disc spring may be used.

In the embodiment, the link mechanism 33
A mounting bracket 34 fixed to the frame-side support member 25, a mounting bracket 35 fixed to the driver's cab-side support member 26, and one end side of the pivot frame 4 through the mounting bracket 34 and the frame-side support member 25. And a link 3 whose other end is connected to the cab body 16 via the mounting bracket 35 and the cab side support member 26.
6, the mounting bracket 34 is directly fixed to the turning frame 4 side, and the mounting bracket 35 is directly fixed to the cab body 16 side. Is also good.

In the embodiment, the upper surface 16A, the front 16B, the rear 16C, the left and right side 16D, 1
Although the box-shaped driver's cab body 16 surrounding the driver's seat by 6D or the like has been described as an example, the present invention is not limited to this. For example, the driver's cab main body may be configured only by a roof provided above the driver's seat. .

On the other hand, in the embodiment, a description has been given by taking a hydraulic excavator as an example of a construction machine. However, the present invention is not limited to this, and may be applied to another construction machine such as a wheel loader or a hydraulic crane having an operator cab. Can also be applied.

[0080]

As described above in detail, according to the first to third aspects of the present invention, the first vibration isolator and the second vibration isolator prevent the vibration of the frame from being transmitted to the cab body. In addition, since the vibration of the cab main body can be attenuated, it is possible to improve the livability in the cab main body and the operability of the operation lever and the like disposed in the cab main body. Further, the first vibration isolator is constituted by a connecting pin extending in the left and right directions and rotatably connecting the cab body on the frame, and an elastic body provided on the outer peripheral side of the connecting pin. Therefore, rolling of the driver's cab main body can be suppressed, and also in this respect, livability and the like can be improved.
In addition, since the first vibration isolator is constituted by the connecting pins, the elastic members, and the like, the vibration isolator can be configured with a small number of parts and a simple configuration, thereby reducing processing accuracy and improving assembling workability. As a result, the manufacturing cost can be reduced.

According to the fourth aspect of the present invention, after the anti-vibration bush is inserted into the pin connection hole of the cab side bracket, the pin connection hole of the frame side bracket and the pin connection hole of the cab side bracket are coaxial. It is possible to assemble the first vibration isolator by arranging it on the line, inserting the coupling pin into the pin coupling hole in this state, and disposing the vibration isolating bush on the outer peripheral side of the coupling pin, thereby improving the assembling workability. can do.

According to the fifth aspect of the present invention, after the anti-vibration bush is inserted into the pin connection hole of the frame side bracket, the pin connection hole of the frame side bracket and the pin connection hole of the cab side bracket are aligned on the same axis. In this state, the connecting pin is inserted into the pin connecting hole, and the vibration isolating bush is provided on the outer peripheral side of the connecting pin, whereby the first vibration isolator can be assembled, and the assembling workability is improved. be able to.

According to the sixth and seventh aspects of the present invention, the second
Since the rigidity of the cab body against pitching can be reduced by the anti-vibration device, the vibration transmissibility of the pitching from the frame to the cab main body can be reduced, and the cab can be controlled by the second anti-vibration device. The pitching caused by the body can be attenuated. Also, the bounce of the cab body can be converted into pitching and attenuated. Further, the rolling of the cab body can be suppressed by the rigidity of the first vibration isolator. Furthermore, yawing of the cab main body can be prevented by a link mechanism provided between the second vibration isolators. This makes it possible to improve the livability in the driver's cab main body and the operability of the operation lever and the like provided in the driver's cab main body, thereby improving the working environment.

According to the eighth aspect of the present invention, it is possible to prevent the second vibration isolator from being excessively deformed when the cab body is displaced upward and downward, and to extend the life of the oil damper and the spring. be able to. Further, by using the elastic stopper, the impact when acting as the stopper can be suppressed to be small, and the livability and the maneuverability can be improved.

[Brief description of the drawings]

FIG. 1 is an external view showing a hydraulic shovel according to an embodiment of the present invention.

2 is a partially broken external view showing an enlarged view of a cab main body, a turning frame, and the like in FIG. 1;

FIG. 3 is an enlarged arrow I showing a turning frame and the like in FIG. 2;
It is sectional drawing seen from the II-III direction.

FIG. 4 is a cross-sectional view of the first vibration isolator in FIG. 3 along with a turning frame and a cab main body, as viewed from the direction of arrows IV-IV.

FIG. 5 is an enlarged sectional view showing the internal structure of the first vibration isolator in FIG.

FIG. 6 is a cross-sectional view of the second vibration isolator in FIG. 3 together with the turning frame and the cab main body, as viewed from the direction indicated by arrows VI-VI.

FIG. 7 is an enlarged sectional view showing the internal structure of the second vibration isolator in FIG.

FIG. 8 is a characteristic diagram showing a vibration transmission characteristic of pitching transmitted from the turning frame to the cab body.

FIG. 9 is a cross-sectional view showing a first modification of the present invention as viewed from the same position as in FIG. 3;

FIG. 10 is a cross-sectional view showing a second modification of the present invention as viewed from the same position as in FIG. 5;

[Explanation of symbols]

4 Revolving frame (frame) 16 Operator cab body 18, 41 First vibration isolator 19, 42 Frame side bracket 19C, 43A Bearing mounting hole (pin connection hole) 21, 43 Operator cab side bracket 21A, 42A, 42B Bush fit Mating hole (pin connection hole) 22, 44 connection pin 23, 45, 46 anti-vibration bush 24 second anti-vibration device 25 frame-side support member 26 cab-side support member 26C flange 27 oil damper 30 coil spring (spring) 31, 32 Rubber ring (elastic stopper) 33 Link mechanism 36 Link

Claims (8)

[Claims] 1. A frame of a construction machine, a cab body disposed on the frame, and a cab body provided between the frame and the cab body, wherein vibration from the frame is transmitted to the cab body. In the construction machine with a driver's cab, comprising: an anti-vibration support means, wherein the anti-vibration support means is located on one side in the front and rear directions of the cab main body and is provided to be separated in the left and right directions; A first vibration isolator that elastically supports the cab body and prevents vibration from being transmitted to the cab body, and is located on the other side in front of and behind the cab body and is separated in the left and right directions And a second vibration isolator that elastically supports the cab main body and prevents transmission of vibration to the cab main body, wherein the first vibration isolator is configured as the cab The cab main body is extended to the left and right directions of the main body and rotatably connected to the frame. Connecting pin and, cab with a construction machine, characterized by being configured and an elastic member provided on an outer peripheral side of the connecting pins. 2. The vibration isolating support means includes a first vibration isolating device provided on a rear side of the cab main body, and a second vibration isolating device provided on a front side of the cab main body. 4. A construction machine with a cab according to claim 1. 3. The anti-vibration support means includes a first anti-vibration device provided at a front side of the cab main body, and a second anti-vibration device provided at a rear side of the cab main body. 4. A construction machine with a cab according to claim 1. 4. The connecting pin constituting the first vibration isolator is connected between a frame-side bracket provided on the frame side and a cab-side bracket provided on the cab body side. The elastic body is an anti-vibration bush formed in a cylinder using a material having elasticity, and the anti-vibration bush is located on an outer peripheral side of the connection pin and is provided in a pin connection hole of the cab side bracket. The construction machine with a cab according to claim 1, wherein the construction machine is configured to be fitted. 5. The connecting pin constituting the first vibration isolator is connected between a frame-side bracket provided on the frame side and a cab-side bracket provided on the cab body side. The elastic body is an anti-vibration bush formed in a cylinder using a material having elasticity, and the anti-vibration bush is located on an outer peripheral side of the connection pin and inserted into a pin connection hole of the frame-side bracket. The construction machine with a cab according to claim 1, wherein the construction machine has a fitting structure. 6. The second vibration isolator is formed with a smaller spring constant than the first vibration isolator, and the second vibration isolator includes a left and right displacement of a cab main body. The construction machine with a driver's cab according to claim 1, further comprising a link mechanism for regulating the pressure. 7. The second vibration isolator, wherein the second vibration isolator comprises an oil damper for attenuating vibration of the cab main body and a spring for elastically supporting the cab main body. The construction machine with a cab according to claim 1, 2, or 3, further comprising a link mechanism for restricting left and right displacements of the cab body. 8. The oil damper and the spring constituting the second vibration isolator are connected to a frame-side support member provided on the frame side and an cab-side support member provided on the cab body side. Installed in between, the cab side support member,
The construction with a driver's cab according to claim 7, wherein an annular flange is provided, and the flange is provided with an elastic stopper for restricting displacement of the cab body upward and downward within a predetermined range. machine.