JP2945207B2 - Working machine with cab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine with a cab , such as a hydraulic shovel, and more particularly, to an operating machine for damping vibration transmitted from a body frame of the working machine to a cab.
Related to a working machine with a room .

[0002]

2. Description of the Related Art FIGS. 9 to 13 show a hydraulic shovel as an example of a conventional working machine with a cab.

In the figure, 1 is a lower traveling body, 2 is a turning device, 3
Denotes an upper revolving unit that is rotatably mounted on the lower traveling unit 1 via the revolving unit 2 and constitutes a working machine main body. The upper revolving unit 3 includes a revolving frame 4 as a main body frame forming a frame structure. A machine room 5 provided on the turning frame 4, a driving room main body 8, which is provided on the turning frame 4 at the front left side of the machine room 5, An operator's cab 6 including various operating levers and instruments provided, and a turning frame 4 located at the rear side of the machine room 5.
And a counterweight 7 provided at the rear of the upper revolving unit 3 with respect to a working device 17 described later.

Reference numeral 8 denotes an operator's cab main body which is disposed on the revolving frame 4 and forms a main body of the operator's cab 6. The operator's cab main body 8 is formed by pressing a thin steel plate and welding. A rectangular ceiling portion 8A extending in the front-rear direction, a substantially rectangular front portion 8B in which an intermediate portion in the vertical direction projects forward, and a vertically-long rectangular shape substantially vertical to the revolving frame 4. And a substantially pentagonal left and right side surface portions 8D, 8D (only one of which is shown) provided with a portion protruding forward according to the shape of the rear surface portion 8C and the front surface portion 8B. It is formed as a box-shaped cab box. A door 9 is provided on a left side surface portion 8D of the cab main body 8, and a floor panel 10 constituting a part of the cab main body 8 is attached to a lower surface side of the cab main body 8 via a floor panel bracket 8E. ing.

Reference numerals 11, 11,... Denote lower buffer supports which elastically support the cab body 8 on the revolving frame 4, and each of the lower buffer supports 11 has a vibration isolating rubber, which will be described later, as shown in FIG. 12, a spacer 13, and each stopper 14 and the like. Each of the lower shock-absorbing supports 11 is located between the floor plate 10 of the cab body 8 and the revolving frame 4,
There are a total of four (only two are shown) separated to the left and right,
The transmission of vibration from the turning frame 4 to the cab body 8 is damped.

Numerals 12 and 12 denote anti-vibration rubbers. Each of the anti-vibration rubbers 12 is formed in a short and thick cylindrical shape by an elastic material such as synthetic rubber, and has a central portion in the axial direction as shown in FIG. An insertion hole 12A is formed. And
Each of the anti-vibration rubbers 12 is disposed so as to be coaxial with a mounting hole 4B formed in the upper surface 4A of the revolving frame 4, and sandwiches the upper surface 4A of the revolving frame 4 from above and below.

Reference numeral 13 denotes a spacer made of a metal cylinder having a bolt insertion hole 13A in the axial direction.
Reference numeral 3 denotes an intermediate portion in the longitudinal direction, which is loosely fitted in the mounting hole 4B of the revolving frame 4, and the upper and lower ends of which are the insertion holes 12 for the respective vibration-proof rubbers 12.
A is fitted inside. The upper and lower ends of the spacer 13 are in contact with a bottom portion 14B of each stopper 14, which will be described later.

Reference numerals 14 and 14 denote stoppers formed into a bottomed cylindrical shape by press-forming a metal plate or the like, and each stopper 14 has a disk having a diameter larger than that of the anti-vibration rubber 12 as shown in FIG. A bottom portion 14B formed in a shape and having a bolt insertion hole 14A formed in the center, and a cylindrical portion extending in the axial direction from an outer peripheral side of the bottom portion 14B and having a shorter length than the vibration-proof rubber 12. 14C, and the tip side of the cylindrical portion 14C is an opening 14D. The stoppers 14 are attached to each other so that the openings 14D face each other with the upper surface 4A of the revolving frame 4 interposed therebetween through the respective rubber cushions 12, and cover the upper and lower rubber cushions 12 from outside. Have been.

Reference numerals 15, 15,... Denote bolts. The bolts 15 are inserted into the bolt insertion holes 8F of the floor panel bracket 8E from the inside of the cab body 8, and the bolt insertion holes 13A of the spacers 13 are provided. , Each bolt insertion hole 10A of the floor plate 10,
The inside of each mounting hole 4B of the upper surface portion 4A of the revolving frame 4 extends, and the lower side of the lower buffer support 11, that is, the stopper 14
The operator's cab main body 8 is positioned on the revolving frame 4 by screwing and tightening the nut 16 from below the bottom portion 14B.

Reference numeral 17 denotes a working device provided at a front portion of the upper revolving unit 3, and the working device 17 is provided on a highly rigid bracket portion 4C forming a part of the revolving frame 4 so as to be capable of elevating and lowering. 17A, an arm 17B provided at the tip of the boom 17A so as to be able to move up and down, and a backhoe type bucket 17 provided rotatably at the tip of the arm 17B.
C, these booms 17A, arms 17B,
The bucket 17C is operated by a boom cylinder 17D, an arm cylinder 17E, and a bucket cylinder 17F. The work apparatus 17 rotates the bucket 17C by the bucket cylinder 17F while raising and lowering the boom 17A and the arm 17B by the boom cylinder 17D and the arm cylinder 17E during the excavation work of the earth and sand. Is to be excavated.

In the hydraulic excavator thus configured,
A prime mover and a hydraulic pump (both not shown) driven by the prime mover are provided in a machine room 5 of the upper swing body 3, and hydraulic oil discharged from the hydraulic pump is supplied to the traveling hydraulic motor of the lower traveling body 1 ( By supplying / discharging the cylinders 17D, 17E, 17F, etc. of the working device 17 and the like, these are actuated to drive the vehicle and perform excavation work such as earth and sand.

The lower shock-absorbing supports 11 provided between the floor plate 10 of the cab body 8 and the revolving frame 4 receive vibrations from the engine, vibrations during traveling, and vibrations due to excavation reaction force during work. The transmission from the revolving frame 4 to the driver's cab main body 8 is buffered by the respective vibration isolating rubbers 12 so that the vibration and noise at this time are reduced so that the riding comfort of the driver's cab 6 is not deteriorated.

As shown in FIG. 11, each lower buffer support 11 has an opening 14D of each stopper 14 with respect to the upper surface 4A of the revolving frame 4, for example, a gap S of about 2 to 3 mm.
The cab main body 8 is restricted from rolling (rolling) in the left and right directions beyond the gap S, whereby the cab main body 8 is attached to peripheral members such as the boom cylinder 17D. It is designed to prevent collision and damage accidents.

[0014]

In the prior art described above, for example, four lower buffer supports 11, 11, and 4 are provided between the upper surface 4A of the turning frame 4 and the floor plate 10 of the cab body 8. Are arranged to prevent the transmission of vibrations from the outside to the cab 6, but there are the following problems.

That is, assuming that the weight W of the cab 6, the total spring constant k of each lower buffer support 11, and the gravitational acceleration G, the natural frequency f of the cab 6 is

[0016]

(Equation 1) Is represented by

[0017] Here, by approximating the cab body 8 in one degree of freedom system vibration model as shown in FIG. 12, the amplitude a ₀ from below
When the forced vibration a ₀ cos ωt is applied in the vertical direction, and the amplitude of the vibration transmitted to the cab 6 is a, the vibration transmission rate τ is

[0018]

Τ = a / a ₀ Where η = ω / ω _n ζ = C / C _c η: Frequency ratio ζ: Damping ratio ω _n : Natural angular frequency C: Damping coefficient C _c : Critical damping coefficient

If this is shown as a characteristic diagram, the frequency ratio η
And the relationship between the vibration transmissibility τ becomes as characteristic lines shown in FIG. 13, the vibration by the resonance when the frequency ratio eta is eta = 1 before and after is increased, the vibration transmissibility and vibration frequency ratio eta is ing large τ is 1
From the following, it can be seen that the vibration is hardly transmitted.

The weight W of the entire cab 6 is 400 to 400.
500 kg, total spring constant k of each lower buffer support 11
Under the condition of 2000 to 8000 kg / cm,
Therefore, the natural frequency f of the cab 6 is about 20 to 45 Hz.

However, the vibration of about 20 to 45 Hz is largely included in the vibration during the operation of the hydraulic shovel, and when the natural frequency f of the cab 6 is in the above range, the frequency ratio η approaches η = 1. , The transmission of vibration to the cab 6 increases,
There is a problem that the ride comfort is deteriorated.

On the other hand, if the spring constant k of each lower shock-absorbing support 11 is reduced in order to lower the natural frequency f, the vibration in the vertical direction can be attenuated, but the pitching or cab in which the cab 6 vibrates in the front-rear direction is possible. 6 vibrates in the left-right direction, so that the rolling becomes large, thereby deteriorating the riding comfort.

When the pitching or rolling becomes large, the cab body 8 is
D and the like, causing a damage accident, and as shown in FIG. 11, the gap S between the opening 14D of each stopper 14 and the upper surface 4A of the revolving frame 4 is set to 2 to 2, for example.
Is set to about 3 mm, when the cab body 8 beyond the gap S is vibrated, the opening 14D of the stopper 14 collides with the upper surface 4A of the revolving frame 4, the revolving frame 4
Therefore, there is a problem that the vibration from the vehicle is directly transmitted to the driver's cab main body 8 and the riding comfort of the driver's cab 6 becomes very poor.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention effectively prevents the cab body from vibrating in the front, rear, left and right directions to cause pitching and rolling. With a driver's cab that can effectively attenuate vertical vibrations and improve ride comfort.
It aims to provide industrial equipment .

[0025]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a work machine main body frame and a main body frame.
Cab main body disposed on the arm, the cab main body and the main body
A plurality of frames are provided between the main frame and the main frame.
Lower shock absorber that dampens the transmission of these vibrations to the cab body
The present invention is applied to a working machine with a cab comprising a support. Soshi
Te, features of the configuration invention of claim 1 is adopted, the body frame is located in the corner portion near the rear corner of the cab body
A vibration restricting body which is provided upright from the base , and is provided between the vibration restricting body and the driver's cab main body, buffers the horizontal vibration of the driver's cab main body with a large spring constant, and vibrates in the vertical direction. in that a configuration and a resilient cushioning member that buffers with a small spring constant to.

According to the second aspect of the present invention, each of the lower buffer supports is constituted by a gas-filled buffer support having a relatively small spring constant .

On the other hand, in the invention according to claim 3, the vibration regulation
The body faced the rear surface of the cab body at intervals
A space between the first support and the side portion of the cab body
The elastic cushioning member is composed of a facing second support,
Between the rear surface of the cab body and the first support and the operation
A structure to be provided between the side portion of the chamber main body and the second support, respectively.
It has been done. Further, in the invention according to claim 4, the vibration regulator
The body is spaced at the rear corner of the cab body.
It consists of a single support facing the support, the support and the cab body
A configuration in which the elastic buffer is provided between the rear corner and the rear corner.
And Further, in the invention of claim 5, each of the elastic shock absorbers is constituted by a laminated seismic isolation rubber obtained by laminating a rubber plate and a metal plate each having a predetermined thickness.

[0028]

According to the first aspect of the present invention, the elastic shock absorber regulates the cab main body to vibrate in the horizontal direction, that is, in the front-rear direction and the left-right direction, with a large spring constant so that the amplitude is reduced. since the chamber body is a to vibrate in the vertical direction to allow with a small spring constant, it is possible to reduce the spring constant with respect to vertical vibration luck Tenshitsu body, to attenuate the vertical vibration transmitted to the cab body I can . In this case, for example, as in the invention of claim 2
Used a lower buffer support consisting of a gas-filled buffer support.
The vibration of the driver's cab in the vertical direction
The spring constant can be further reduced, and the upper and lower
Directional vibration can be damped. Its to the vibration in the longitudinal direction and the lateral direction of the cab body, for example, claims
As in the invention of the fifth aspect, the size can be restricted by the elastic cushioning member made of laminated seismic isolation rubber or the like, so that rolling and pitching of the cab body can be prevented.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

First, FIGS. 1 to 5 show a first embodiment of the present invention.

In the drawing, reference numeral 21 denotes a revolving frame serving as a main body frame of the upper revolving unit 3. The revolving frame 21 has substantially the same configuration as the revolving frame 4 described in the prior art, An insertion hole 21B into which each gas spring 25 described later is inserted is formed in the upper surface portion 21A, and the lower end of each gas spring 25 is fixed to the lower surface portion 21C. As shown in FIGS. 3 and 4, the revolving frame 21 has a pair of brackets 21D, 21D on the front side, and the brackets 21D support the boom 17A and the boom cylinders 17D with high rigidity. doing.

Reference numeral 22 denotes an operator's cab body disposed on the front left side of the turning frame 21. The operator's cab body 22 has substantially the same configuration as the operator's cab body 8 of the operator's cab 6 described in the prior art, and has a ceiling. It has a part 22A, a front part 22B, a rear part 22C, and left and right side parts 22D, 22D. And
A door 23 is provided on a side surface portion 22D of the cab main body 22, and a floor plate 24 constituting a part of the cab main body 22 is provided on each of lower surface brackets 22E, 22E,. Is fixed through. As shown in FIGS. 3 and 4, laminated seismic isolation rubbers 41 and 42, which will be described later, are attached to the rear surface 22C and the right side surface 22D in the vicinity of the rear right corner 22F of the cab main body 22. ing.

Reference numerals 25, 25,... Denote gas springs serving as lower shock-absorbing supports provided between the turning frame 21 and the floor plate 24 of the cab body 22, and each of the gas springs 25 is described in the prior art. Almost like each lower buffer support 11, floor plate 2
Although arranged near the four corners of No. 4, each gas spring 25 is constituted by a gas-filled buffer support having a relatively small spring constant. Each gas spring 25, together with the laminated seismic isolation rubbers 41 and 42, buffers the vertical vibration (Z-axis direction) of the cab body 22 with a relatively small spring constant, and effectively attenuates the vertical vibration. Let it.

Here, as shown in FIG. 2, each of the gas springs 25 is an elastic cylinder 26 made of an elastic resin material.
Upper and lower mounting plates 28 and 29 for closing upper and lower ends of the elastic cylinder 26 and defining a gas chamber 27 in the elastic cylinder 26;
A lower end of the elastic cylinder 26 is attached via a washer 32 to a mounting bolt 31 provided so as to be inserted through the upper mounting plate 28 and fastened to each floor plate bracket 22E and the floor plate 24 of the cab body 22 by a nut 30. The bolt 33 fixed to the plate 29 and the mounting plate 29 are attached to the lower surface 21 of the revolving frame 21.
The other bolts 34, 34 fastened to C, are fitted to the middle part of the elastic tube 26 in the longitudinal direction, and the middle part of the elastic tube 26
And a ring 35 for reducing the diameter in the shape of a letter.

A gas sealing portion 31B for sealing a pressurized gas such as air into the gas chamber 27 is provided at the upper end side of the mounting bolt 31 through a gas passage 31A.
The pressurized gas inside sets the spring constant of the gas spring 25 to a predetermined value corresponding to the sealing pressure. Each gas spring 25 inserts the elastic cylinder 26 into the insertion hole 21B of the revolving frame 21 so that the lower surface 21
C and the floor plate 24 of the operator's cab main body 22 and the like, and are fixed therebetween through the bolts 34 and the nuts 30 and the like.

[0036] 36 and 37 show the first, second strut as the high rigidity portion to become bracket portion 21D on the bolt (not shown) secured to vibration regulating body through such a revolving frame 21, the first As shown in FIGS. 3 and 4 , the first and second columns 36 and 37 are formed of a highly rigid metal plate having a U-shaped cross section, and extend upward from the revolving frame 21 with a predetermined height. . Then, the first, corners of the rear right side of the second strut 36 and 37 cab body 22 22F
In the vicinity, the first support 36 faces the rear surface 22C of the cab main body 22 at a predetermined interval, and the second support 37 faces the right side surface 22D at a predetermined interval.

As shown in FIG. 5, the column 36 has a predetermined width in the left-right direction of the revolving frame 21 and a flat portion 36A extending in the vertical direction with a predetermined length, and a left side of the flat portion 36A. , Which are formed by bending both right end sides into a substantially L-shape, and include reinforcing plate portions 36B and 36C extending rearward of the cab main body 22, and the lower end side of the reinforcing plate portion 36C is on the left side of the bracket portion 21D. It is fixed to the surface. Further, a bolt insertion hole 36D is formed at a predetermined height position in the flat plate portion 36A of the column 36, and a mounting bolt 41A of a laminated seismic isolation rubber 41 described later is inserted into the bolt insertion hole 36D.

On the other hand, the column 37 has a predetermined width in the front-rear direction of the revolving frame 21 and a flat plate portion 37A extending with a predetermined length in the vertical direction, and substantially the front and rear ends of the flat plate portion 37A. Formed by bending into an L-shape,
Reinforcing plate portions 37B, 37 extending rightward of the cab body 22
The lower end of the flat plate portion 37A is fixed to the right side surface of the bracket portion 21D via a flat spacer 38. A bolt insertion hole 37D is formed at a predetermined height position in the flat plate portion 37A of the column 37, and a mounting bolt 42A of the laminated seismic isolation rubber 42 described later is inserted into the bolt insertion hole 37D.

Reference numerals 39 and 40 denote corner portions 22 of the cab main body 22.
F indicates a screw seat which is fixed to the rear surface portion 22C and the side surface portion 22D by means of welding or the like near the front surface F.
9 and 40 are formed in a columnar or prismatic shape with a predetermined thickness, and have bottomed screw holes 39A and 40A in the center. The screw seats 39 and 40 are disposed at predetermined height positions of the rear surface portion 22C and the side surface portion 22D, and the screw holes 39A and 40A are provided in the bolt insertion holes 3 of the columns 36 and 37.
It faces 6D and 37D.

Further, reference numerals 41 and 42 denote laminated seismic isolation rubbers as elastic cushions provided between the columns 36 and 37 and the screw seats 39 and 40, and the laminated seismic isolation rubbers 41 and 42 have mounting bolts 41A. , 41B, and between the mounting bolts 42A, 42B, rubber plates 41C, 41C,.
C, 42C,... And steel plates 41D, 41 as metal plates
D,..., 42D, 42D,... Are formed by alternately laminating them, and have a large spring constant for tensile and compressive loads in the thickness direction, and a small spring constant for loads in the shear direction. Has a constant.

Here, mounting bolts 41A and 42A of the laminated seismic isolation rubbers 41 and 42 are fixed to the columns 36 and 37 by nuts 43 and 44, respectively, and the mounting bolts 41B and 42B.
Are fixed to the screw holes 39A, 40A of the screw seats 39, 40, and are disposed between the columns 36, 37 and the screw seats 39, 40 with an initial load applied to the rubber plates 41C, 42C and the like. . Then, the laminated seismic isolation rubber 41 is attached to the cab body 22.
Vibrates in the front-rear direction (Y-axis direction) with a large spring constant, and the laminated seismic isolation rubber 42 buffers the vibration of the cab body 22 in the left-right direction (X-axis direction) with a large spring constant. Further, the laminated seismic isolation rubbers 41 and 42 buffer the cab main body 22 from vibrating in the vertical direction (Z-axis direction) together with the gas springs 25 with a relatively small spring constant.

The hydraulic shovel according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

According to this embodiment, gas springs 25, 25,... As gas-filled buffer supports are provided between the turning frame 21 and the floor plate 24 of the cab body 22.
The gas spring 25 buffers and supports the cab main body 22 with a relatively small spring constant. The bracket 21D, which is a high-rigidity portion of the revolving frame 21, includes an cab. Posts 36 and 37 are erected so as to be located near the corner 22F of the main body 22 and face the rear face 22C and the right side face 22D of the cab main body 22,
Between the screw seats 39 and 40 provided on the rear surface portion 22C and the side surface portion 22D of the operator cab body 22 and the columns 36 and 37, horizontal vibration is buffered with a large spring constant, and vertical vibration is reduced by a small spring. Laminated seismic isolation rubber 4 that buffers with a constant
Since the first and second elements are provided, the following operation and effect can be obtained.

That is, when vibration in the front-rear direction is transmitted from the turning frame 21 to the cab main body 22 at the time of working or traveling of the hydraulic excavator, the vibration is greatly increased by the laminated seismic isolation rubber 41 between the column 36 and the screw seat 39. With the spring constant,
It is possible to regulate the amplitude to be small, and it is possible to effectively prevent the cab main body 22 from vibrating (pitching) largely in the front-rear direction. When vibration in the left-right direction is transmitted from the revolving frame 21 to the cab body 22, the vibration is regulated by the laminated seismic isolation rubber 42 between the column 37 and the screw seat 40 so as to have a large spring constant and a small amplitude. Thus, it is possible to effectively suppress the cab main body 22 from vibrating (rolling) largely in the left-right direction.

When the vertical vibration is transmitted from the turning frame 21 to the cab body 22, each gas spring 2 between the turning frame 21 and the floor plate 24 of the cab body 22.
5, the vibration in the vertical direction can be buffered by the laminated seismic isolation rubbers 41, 42 with a small spring constant.
Vertical vibrations can be effectively attenuated by reducing the overall natural frequency.

Therefore, in the present embodiment, it is possible to effectively prevent the cab main body 22 from pitching in the front-rear direction and from rolling in the left-right direction, and the cab main body 22 is provided with the boom cylinder 17D (see FIG. 4) and the like. In addition to solving problems such as collision with surrounding members, the natural frequency of the driver's cab 6 can be reduced, and vertical vibration transmitted to the driver's cab body 22 can be reliably reduced, so that the riding comfort of the vehicle is greatly improved. Various effects can be achieved, such as possible.

FIGS. 6 to 8 show a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. The feature of the present embodiment is that one support column 51 as a vibration restricting member is erected on the bracket portion 21D of the turning frame 21 so as to face the corner 22F of the cab body 22. A screw seat 52 provided at a corner 22F of the cab body 22
There is provided a laminated seismic isolation rubber 53 as an elastic buffer between the and the support column 51.

Here, the column 51 is formed substantially in the same manner as the column 37 described in the first embodiment, and has a flat plate portion 51A, reinforcing plate portions 51B and 51C, and bolt insertion holes 51D. The lower end of the flat plate portion 51A of the support column 51 is fixed to the bracket portion 21D in a state of being inclined at an angle of, for example, 45 degrees. In addition, the screw seat 52 is
Is fixed to the corner portion 22F of the cab main body 22 so as to face the flat plate portion 51A at a predetermined interval.
As shown in FIG. 8, it protrudes from the rear surface portion 22C and the right side surface portion 22D at an inclination of, for example, 45 degrees. In the screw seat 52, a screw hole 52A into which a mounting bolt 53B described later is screwed is formed so as to face the bolt insertion hole 51D of the support column 51.

The laminated seismic isolation rubber 53 is substantially the same as the laminated seismic isolation rubber 41 (42) described in the first embodiment, and rubber plates 53C, 5B are provided between the mounting bolts 53A, 53B, respectively.
3C,... And steel plates 53D, 53D,... Are laminated, and the mounting bolt 53A is fixed to the flat plate portion 51A of the column 51 by a nut 54, and the mounting bolt 53B.
Is screwed into the screw hole 52A of the screw seat 52. The laminated seismic isolation rubber 53 is attached between the rear right corner portion 22F of the cab main body 22 and the support column 51 at an angle of, for example, 45 degrees.
May vibrate (pitch) in the front-rear direction (Y-axis direction)
Vibration (rolling) in the horizontal direction (X-axis direction) is buffered with a large spring constant, and vertical vibration is buffered with a small spring constant.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effects as those of the first embodiment can be obtained. Vibration in both the front-rear direction and the left-right direction of the cab main body 22 can be restricted to a small value, and the number of components such as the support column 51, the screw seat 52, and the laminated seismic isolation rubber 53 can be reduced.

In each of the above embodiments, the turning frame 2
Although the case where gas springs 25, 25,... Are provided as a lower buffer support between the cab body 1 and the floor plate 24 of the cab main body 22 has been described as an example, the present invention is not limited to this. The above-described lower cushioning support 11 made of the anti-vibration rubber 12 or the like shown in FIG. 11 may be used. In this case, between the upper surface 4A of the turning frame 4 and the opening 14D of the stopper 14 illustrated in FIG. May be increased to about 5 to 30 mm, and the spring constant of the vibration isolation rubber 12 or the like may be set to a small value.

The turning frame 21 and the cab body 22
Instead of the gas springs 25, a spring means such as a coil spring or a viscous mount such as a hydraulic shock absorber may be provided between the floor plate 24 and the bottom plate 24 as a lower buffer support.

Further, in each of the above embodiments, the description has been made by taking the hydraulic excavator as an example. However, the present invention is not limited to this, and may be applied to a working machine such as a wheel type hydraulic excavator or a hydraulic crane having an operator's cab. it can.

[0054]

As described above in detail, according to the calling <br/> light according to claim 1, upward vibration regulating member in the main body frame is located in the corner portion near the rear corner of the cab body erected on, the between the vibration regulating member and the cab body, has a large spring constant with respect to the horizontal direction of the vibration, the elastic damping body having a small spring constant with respect to vertical vibration and the provided Ru configuration treasure, more large elastic buffer body of the spring constant with respect to the horizontal direction of the vibration, can regulation or pitching direction cab body back and forth, from or rolling in the lateral direction, the periphery member Collision can be reliably prevented . Also, elastic relaxation
The impact body has a small spring constant for vertical vibration.
Therefore, the natural frequency of the driver's cab can be reduced to effectively attenuate the vertical vibration, and the riding comfort of the vehicle can be improved.

[0055] According to the invention described in claim 2, since a relatively spring constant of each lower buffer support is constituted by a small gas-filled cushioning support reliably reduce the natural frequency of the cab Thus, it is possible to more effectively reduce the vertical vibration of the driver's cab body together with the elastic buffer, so that the riding comfort of the vehicle can be further improved . Claims
According to the invention described in Item 3, an interval is provided at the rear surface of the cab body.
Between the first strut and the rear surface of the cab body
A shock absorber is provided, and a space is provided between the side surfaces of the cab body.
The second pillar and the side of the cab body facing each other with a gap
By providing an elastic buffer between them,
The driver's cab body is pitched in the front-rear direction,
Rolling can be regulated and the vertical direction
Vibration can be effectively attenuated, and the ride quality of the vehicle can be improved.
You. The invention described in claim 4 is a rear part of the cab body.
Vibration regulation by a single support facing the corner at an interval
Forming a control body, the rear corner of the cab main body and the support
Since an elastic buffer is provided between the driver's cab
The main unit can be pitched in the front-rear direction,
And reduce the number of parts.
As well as effectively dampen vertical vibrations,
Both ride comfort can be improved. Further, according to claim 5
In the invention, the elastic buffer is made of laminated seismic isolation rubber.
The driver's cab is pitched in the front-rear direction,
Rolling in the left and right direction can be regulated, and
Collision can be prevented, and
Lower frequency to effectively dampen vertical vibration
Various effects can be achieved, such as improving the ride comfort of the vehicle .

[Brief description of the drawings]

FIG. 1 is a partially broken external view showing a cab body, a turning frame, and the like according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a gas spring and the like shown in FIG.

FIG. 3 is a perspective view showing a cab main body and the like provided on a turning frame.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is an enlarged sectional view of a support column, a laminated seismic isolation rubber, and the like shown in FIG.

FIG. 6 is a perspective view similar to FIG. 3, showing a second embodiment.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is an enlarged sectional view of a support column, a laminated seismic isolation rubber, and the like shown in FIG. 7;

FIG. 9 is an overall view showing a conventional hydraulic excavator.

FIG. 10 is an enlarged partially broken external view showing a turning frame, a cab main body, and the like in FIG. 9;

FIG. 11 is an enlarged sectional view of a lower buffer support and the like shown in FIG. 10;

FIG. 12 is an explanatory diagram for analyzing vibration of a cab.

FIG. 13 is a characteristic diagram showing a relationship between a frequency ratio of forced vibration to a natural frequency of a cab and a vibration transmissibility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Revolving frame (body frame) 22 Cab body 22F Corner 24F Floor plate 25 Gas spring (lower buffer support) 36,37,51 Support column (vibration control body) 39,40,52 Screw seat 41,42,53 Lamination Seismic isolation rubber (elastic buffer) 41C, 42C, 53C Rubber plate 41D, 42D, 53D Steel plate (metal plate)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Sakyo 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (56) References Japanese Utility Model 3-20746 (JP, U) 2-45881 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02F 9/16

Claims (5)

(57) [Claims] And 1. A body frame of the working machine, and luck Tenshitsu body disposed on the body frame, a plurality provided between the cab the body and the body frame, from the main frame in the lower buffer support and consisting of the cab with the working machine, wherein situated in the corner near the rear corner of the cab body body vibration is buffered from being transferred to the cab body
A vibration restricting body that is provided upright from the frame , and is provided between the vibration restricting body and the cab main body, buffers the horizontal vibration of the cab main body with a large spring constant, and vertically A working machine with an operator's cab , comprising: an elastic buffering member that buffers vibration with a small spring constant. 2. The working machine with a cab according to claim 1, wherein each of said lower buffer supports is constituted by a gas-filled buffer support having a relatively small spring constant. (3) The vibration restrictor is located behind the cab body.
A first strut facing the surface with a gap, and the cab
From the second strut facing the side of the main body at intervals
And the elastic cushioning member is disposed between the rear surface portion of the cab main body and the first portion.
Between the support and the side portion of the cab body and the second support.
Claim 1 or Claim 2 which becomes a structure provided respectively between a pillar and
Is a working machine with a cab according to 2. (4) The vibration restrictor is located behind the cab body.
From a single pillar facing the corners
Between the support and the rear corner of the cab body.
The structure according to claim 1 or 2, wherein the elastic buffer is provided.
3. The working machine with a cab according to 2. 5. A cab according to the elastic buffer body according to claim 1, respectively constituted by stacking seismic isolation rubber formed by laminating a predetermined thickness rubber plate and metal plate, 2, 3 or 4
With working machine .