JPH0598666A - Driver's cab for working machine - Google Patents

Abstract

PURPOSE:To restrict the lateral vibration of a driver's cab and effectively damp the vertical vibration. CONSTITUTION:A pair of stoppers 24, 24 are provided on the back face section 15C of a driver's cab main body 15, and balls 25 are rollably provided in the stoppers 24. A guide 27 is fitted to a swinging arm 4 via vibration isolators 31, and the guide section 29 of the guide 27 is provided vertically movably via the balls 25 between the stoppers 24. The lateral vibration of the driver's cab main body 15 is restricted via the vibration isolators 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab of a working machine provided in a working machine such as a hydraulic excavator, and more particularly to a working cab of a working machine capable of preventing a vibration from a main body frame from being transmitted to the cab. Regarding the cab.

[0002]

2. Description of the Related Art Generally, a main body frame of a working machine, a front surface portion provided on the main body frame and provided on a floor plate,
A driver's cab main body formed in a box shape from a rear surface portion, left and right side surfaces and an upper surface portion, and provided between a floor plate of the driver's cab main body and a main body frame, and vibration from the main body frame A cab of a working machine is known which comprises a plurality of buffer supports for buffering the transmission to the work.

That is, in a working machine such as a hydraulic excavator, when vibrations generated by excavation reaction force during excavation work such as earth and sand and vibrations during traveling are transmitted to the operator's cab, the comfortability of the operator in the operator's cabin is deteriorated. Since the operability of the operating lever etc. will be reduced, a plurality of buffer supports will be provided between the floor plate of the cab body and the body frame to prevent vibration from the body frame from being transmitted to the cab body. I am trying.

Here, a viscous mount or the like in combination with an anti-vibration rubber or a liquid damper is adopted as a buffer support provided in the cab of this type of working machine, and the vibration width of the cab main body is used as the buffer support. Is provided so as to reach a stroke of, for example, about 2 to 3 mm. The stopper prevents the driver's cab body from colliding with a peripheral member on the body frame, for example, a boom cylinder or the like, when the driver's cab body rolls laterally, the vibration width thereof reaches within a predetermined stroke. I am trying.

[0005]

By the way, in the above-mentioned prior art, when using the antivibration rubber for the buffer support, the antivibration rubber is normally compressed at a pressure of about several thousand kg / cm ² and set to be stiff. Since the vibration width of the driver's cab main body is kept small by the stopper, the large vibration generated during excavation work of rock etc. and traveling on bad roads cannot be sufficiently buffered by the buffer support, and noise in the driver's cab also occurs. There is a problem of getting bigger.

Further, even when a viscous mount is used as the cushioning support, there is a problem that it is difficult to effectively cushion the vibration because the stroke during vibration is restricted to be small.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can prevent the driver's cab body from rolling laterally to prevent contact with surrounding members. It is an object of the present invention to provide a driver's cab of a working machine that can give a large stroke to vertical vibrations and can effectively dampen the vibration of the cab body.

[0008]

The features of the structure adopted by the present invention to solve the above-mentioned problems are that a pair of stoppers are provided on the rear surface of the operator's cab body so as to be spaced apart in the left-right direction and extend in the up-down direction. A vibration restricting body that is located between the stoppers in the main body frame to allow the driver's cab main body to vibrate in the vertical direction and to restrict the driver's cab main body from laterally oscillating via a vibration-proof rubber. Has been established.

The vibration regulating body is movably arranged in the vertical direction between the stoppers, and a guide whose movement in the horizontal direction is regulated is provided between the guide and the body frame via a vibration-proof rubber. It is preferably composed of a vibration isolator to be attached.

[0010]

With the above structure, the vibration regulator restricts the vibration of the driver's cab body in the left-right direction via the anti-vibration rubber.
A large stroke (vibration width) can be given to the buffer support provided between the floor plate of the cab main body and the main frame, and the vertical vibration of the cab main body can be buffered by this buffer support. ..

[0011]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 10 by taking a hydraulic excavator as an example.

First, FIGS. 1 to 7 show a first embodiment of the present invention.

In the drawings, 1 is an undercarriage, 2 is a revolving device, 3 is a revolving device mounted on the undercarriage 1 via the revolving device 2, and is an upper revolving structure which constitutes a working machine body. The upper revolving structure 3 is composed of a revolving frame 4 as a main body frame having a frame structure, a machine room 5, a driver's cab 6 and a counterweight 7 provided on the revolving frame 4, and the front of the revolving frame 4 is provided. A mounting bracket 4A for a working device 8 which will be described later and is located on the left side of the operator's cab 6.
Are provided integrally.

Reference numeral 8 denotes a working device provided in the front part of the upper swing body 3, and the working device 8 is a boom 9 provided on the mounting bracket 4A of the swing frame 4 so as to be able to descend and descend, and a boom 9 of the boom 9. Arm 10 provided on the tip side so as to be able to move downward
And a bucket 11 rotatably provided on the tip side of the arm 10, and these boom 9, arm 10 and bucket 11 are differentiated by a boom cylinder 12, an arm cylinder 13 and a bucket cylinder 14.

Reference numeral 15 denotes a driver's cab main body which constitutes the main body of the driver's cab 6. The driver's cab main body 15 is, as shown in FIG. 2, a floor plate 15A and a front portion 15 provided on the floor plate 15A.
B, the rear surface portion 15C, the left and right side surface portions 15D and 15D, and the upper surface portion 15E are formed as a box-shaped cab box. Further, the driver's cab body 15 has a front portion 15
B, a floor plate bracket 15F for fixing the floor plate 15A is provided on the lower end sides of the rear surface portion 15C and the side surface portions 15D,
A door 16 for an operator to get on and off is provided in the driver's cab main body 15 on the right side surface portion 15D so as to be opened and closed. The cab main body 15 is mounted on the upper surface portion 4B of the swivel frame 4 via buffer supports 17 to be described later.

The buffers 17, 17, ... Are provided between the floor plate 15A of the cab body 15 and the revolving frame 4 in order to buffer the vibrations from the revolving frame 4 from being transmitted to the cab body 15. And each of the buffer supports 17 is a floor plate 15
At the four corners of A, front, rear, left, and right are spaced apart, for example, four are provided, and a pair of stoppers 18, 18 as shown in FIG.
A pair of anti-vibration rubbers 19 and 19 arranged between the stoppers 18 and sandwiching the upper surface 4B of the revolving frame 4, and a cylindrical spacer provided so as to penetrate through the center of each anti-vibration rubber 19. 20 and a bolt 22 inserted into the spacer 20 from the turning frame 4 side and having a nut 21 fastened on the floor plate bracket 15F.

Here, each of the buffer supports 17 is a nut 21.
By firmly screwing the bolt to the bolt 22, each stopper 1
Each anti-vibration rubber 19 is compressed and deformed between 8
The upper surface portion 4B of the revolving frame 4 is strongly clamped in a state where an initial load is applied to 9. Then, each of the buffer supports 1
7 is an anti-vibration rubber 19 for the entire cab 6 on the revolving frame 4.
The vibration of the driver's cab main body 15 is damped in the vertical direction. Further, a gap S having a predetermined size is provided between the upper surface portion 4B of the revolving frame 4 and each stopper 18.
1, the vibration width (stroke) of the cab body 15 is formed.
Is regulated within the range of the gap S1.

Reference numeral 23 denotes a stopper support member fixedly provided on the rear surface portion 15C of the operator's cab body 15 by means such as welding. The stopper support member 23 is fixed to an intermediate portion in the height direction of the rear surface portion 15C, The rear surface portion 15C extends in the left-right direction with a predetermined length. Further, as shown in FIG. 6, a pair of stoppers 24, 24 that are formed in a U-shaped cross section and extend vertically are integrally provided on both left and right sides of the stopper support 23. And, each stopper 24 is
The lower ends are closed and formed in a box shape that opens at opposite positions in the left-right direction. Inside each stopper 24, for example, four metal balls 25, 25 as rolling elements are rollable. It is arranged.

Reference numeral 26 denotes a vibration restricting body that restricts the lateral vibration (rolling) of the cab body 15. The vibration restricting body 26 is formed by bending into a substantially L shape as shown in FIG. It is composed of a guide 27 and each vibration isolator 31 described later,
The guide 27 includes a bracket portion 28 on the lower end side, and a guide portion 29 extending upward from the bracket portion 28 and formed in a rectangular shape as shown in FIG. And
A pair of sliding plates 30 and 30 extending in the vertical direction are fixed to the left and right ends of the guide portion 29, and the sliding plates 30 slide on the balls 25 between the stoppers 24,
The driver's cab body 15 is allowed to be displaced (vibrated) relative to the guide 27 in the vertical direction, and is restrained from being vibrated in the horizontal direction. Further, the bracket portion 28 of the guide 27 extends in the left-right direction at the lower end side of the guide portion 29 and extends, and the left and right ends thereof are on the upper surface 4B of the revolving frame 4 on the vibration isolator 3 respectively.
It is attached through 1.

Reference numerals 31 and 31 denote the rear surface portion 15 of the operator cab body 15.
A vibration proof body located near C and disposed between the upper surface portion 4B of the revolving frame 4 and the bracket portion 28 of the guide 27 is shown. The respective vibration proof bodies 31 are substantially the same as the buffer support body 17. , A pair of stoppers 32, 32, a pair of anti-vibration rubber 33,
33, spacers 34, nuts 35, and bolts 36, each of the vibration isolator 31 includes a nut 35 and a bolt 36.
When the upper surface portion 4B of the revolving frame 4 is sandwiched between the anti-vibration rubbers 33 by being fastened to the upper surface 4B and the stopper 32, as shown in FIG.
(S2 <S1) is formed. And
Each vibration isolator 31 elastically supports the guide 27 on the swivel frame 4 via each anti-vibration rubber 33, and the vibration from the swivel frame 4 vibrates the driver's cab body 15 in the left-right direction (horizontal vibration).
As described above, the transmission to the guide 27 is buffered with a vibration width (stroke) corresponding to the gap S2.

The hydraulic excavator according to the present embodiment has the above-described structure, and the lower traveling unit 1 travels on the road, and the working device 8 excavates earth and sand.
When the vibration generated by the excavation reaction force from the bucket 11 and the vibration during traveling are transmitted to the cab main body 15 via the revolving frame 4, the vibrations are transmitted to the anti-vibration rubbers 19 and the anti-vibration rubbers of the buffer supports 17. The vibration damping rubbers 33 of the body 31 can dampen the vibrations and effectively prevent large vibrations from being transmitted to the cab body 8.

That is, according to this embodiment, the cab body 15
Between the floor plate 15A and the revolving frame 4 are provided, for example, four buffer supports 17, 17 ,.
A stopper support 23 having a pair of left and right stoppers 24, 24 is fixed to the rear surface portion 15C, and each stopper 24
Each ball 25 is rotatably provided inside, and a guide 27 for sliding left and right sliding plates 30 on each ball 25 is provided between the stoppers 24 so as to be vertically movable. Since the bracket portion 28 of 27 is mounted on the revolving frame 4 via each vibration isolator 31, the following operational effects are obtained.

First, when the revolving frame 4 vibrates (swayss) in the left-right direction, this vibration is transmitted to the driver's cab body 15 and the anti-vibration rubbers 19, 33 of the shock-absorbing supports 17 and the anti-vibration bodies 31 are transmitted. When the vibration width (stroke) at this time exceeds the gap S2 (see FIG. 7) between the stopper 32 of each vibration isolator 31 and the swing frame 4,
Since the stopper 32 abuts on the revolving frame 4 to prevent the guide 27 from rolling further, the driver's cab main body 15 abutting on the guide 27 via the rollers 25 and the stoppers 24 is the same as the guide 27. The roll of the driver's cab main body 15 is restricted by the clearance S3 (for example, 20 to 30) between the boom cylinder 12 and the boom cylinder 12 shown in FIG.
mm)), the cab body 15
It is possible to reliably prevent the contact and interference with surrounding members such as the boom cylinder 12.

On the other hand, when the revolving frame 4 vibrates in the vertical direction, the operator cab main body 15 can be displaced relative to the guide 27 in the vertical direction by the balls 25 provided in the stoppers 24. While the chamber body 15 vibrates in the vertical direction along the guide 27, this vibration is damped by the buffer supports 17 between the swivel frame 4 and the floor plate 15A. The vibration width (stroke) at this time is regulated by the gap S1 (see FIG. 3) between the stopper 18 of each buffer support 17 and the revolving frame 4, but the operator cab body 15 and the boom cylinder 12
The contact and the interference with the guide 27 and the vibration isolator 31
Therefore, it is possible to increase the vertical vibration width (stroke) by increasing the gap S1.

Therefore, in this embodiment, each buffer support 17
By increasing the gap S1 between the stopper 18 and the revolving frame 4, it is possible to give a large vibration damping effect to the respective vibration-proof rubbers 19 of the respective shock-absorbing supports 17, and the vibration in the vertical direction on the operator cab body 15 is increased. Can be effectively buffered, and the habitability of the operator in the cab 6 and the operability of the operation lever and the like can be significantly improved.

Further, since the vertical vibration width (stroke) of the cab main body 15 can be made large, each buffer support 17 disposed between the revolving frame 4 and the floor plate 15A of the cab main body 15 is provided. It becomes possible to configure by a viscous mount composed of a liquid damper or the like, and in this case, various effects such as more effective damping of vertical vibration can be obtained.

Next, FIGS. 8 and 9 show a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof is omitted. However, the feature of this embodiment is that the rear surface portion 1 of the cab body 15 is
5C is provided with a pair of rails 41, 41, which are located at an intermediate portion in the height direction and are separated from each other in the left-right direction and which extend in the up-down direction and have an L-shaped cross section, which are fixed to each other. The reason is that the vibration regulator 42 extending between the rails 41 is provided.

Here, as shown in FIGS. 8 and 9, the vibration restricting body 42 is provided with a bolt 43 and a bolt 43 on the upper surface 4B of the revolving frame 4.
43, etc., and a bracket 44 having a support plate 44A that extends upward and a support plate 4 for the bracket 44.
A guide 46 is attached to the upper end side of 4A via a vibration isolator 47, which will be described later, and is vertically movably arranged between the rails 41 via rollers 45, 45, ... As four rolling elements. The guide 46 includes a rectangular guide plate 46A arranged between the rails 41 and the guide plate 46A.
And a mounting plate 46 </ b> B, which is provided so as to project rearward from and has a vibration isolator 47 mounted thereto.

Reference numeral 47 indicates a vibration isolator disposed between the upper end side of the support plate 44A of the bracket 44 and the mounting plate 46B of the guide 46. The vibration isolator 47 is the vibration isolator described in the first embodiment. Almost the same as the vibrating body 31, it comprises a pair of stoppers 48, 48, a pair of anti-vibration rubbers 49, 49, a spacer 50, a nut 51 and a bolt 52.
1 is each of the anti-vibration rubber 4 between the support plate 44A and the mounting plate 46B.
9 is fastened via each stopper 48. A gap S2 is formed between each stopper 48 and the support plate 44A, and the vibration width (stroke) when the driver's cab body 15 rolls laterally is regulated within the range of the gap S2. Further, a pair of reinforcing plates 44B and 44B are fixedly provided on the bracket 44 on both the left and right sides of the supporting plate 44A to prevent the supporting plate 44A from bending in the left-right direction.

Thus, also in this embodiment having such a configuration, the rollers 45 rotatably provided on the guide plate 46A of the guide 46 are brought into contact with the rails 41 of the driver's cab main body 15 so that the driver's cab main body 15 can be prevented. Is allowed to vibrate in the vertical direction with respect to the revolving frame 4, and the vibration in the lateral direction is restricted within the range of the gap S2 through the respective vibration-proof rubbers 33. It is possible to obtain substantially the same operational effect as.

Next, FIG. 10 shows a third embodiment of the present invention. In this embodiment as well, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. To do
The present embodiment is characterized in that rails 51, 51 as a pair of stoppers are fixedly provided on the rear surface portion 15C of the cab main body 15, and a vibration restricting body 52 is provided on the upper surface portion 4B of the revolving frame 4 to cause the vibration. The restricting body 52 is composed of a bracket 54 fixed to the upper surface 4B via bolts 53 and the like, and a pair of anti-vibration rubbers 55, 55 provided on the support plate 54A of the bracket 54 so as to project in the left-right direction. Especially.

Here, each rail 51 and bracket 5
4 is constructed in substantially the same manner as the rails 41 and the bracket 44 described in the second embodiment, and the bracket 54 is provided with the reinforcing plates 54B on both the left and right sides of the support plate 54A. Further, each anti-vibration rubber 55 is positioned on the upper end side of the support plate 54A via a bolt (not shown) or the like, and its tip end face is separated from each rail 51 by a minute gap t (t <S2). Face to face. The anti-vibration rubbers 55 allow the driver cab body 15 to vibrate in the vertical direction, and when the driver cab body 15 vibrates in the left and right directions, they come into contact with the rails 51 and are elastically deformed. As in each of the embodiments, the clearance S2 is regulated within the range.

Thus, also in this embodiment having such a structure, the vibrations 55 in the left and right directions of the driver's cab main body 15 can be damped by the respective vibration isolating rubbers 55, and substantially the same effects as those of the respective embodiments can be obtained. However, particularly in the present embodiment, the structure of the vibration restricting body 52 can be simplified and the cost can be reduced.

[0034]

As described above in detail, according to the present invention, a pair of stoppers which are spaced apart in the left-right direction and extend in the up-down direction are provided on the rear surface portion of the operator's cab main body, and the main body frame is positioned between the stoppers. And, because the driver's cab body is allowed to vibrate in the vertical direction, and the vibration regulator that regulates the vibration in the left-right direction via the anti-vibration rubber is provided, when the driver's cab body laterally sways in the horizontal direction, It is possible to prevent contact with surrounding members such as a boom cylinder, and it is possible to secure a large vertical vibration width (stroke). Therefore, the stroke of each buffer support provided between the floor plate of the cab body and the body frame can be increased, the vertical vibration of the cab body can be effectively buffered, and the comfortability of the operator in the cab and It is possible to improve the operability of the operation lever and the like.

[Brief description of drawings]

FIG. 1 is an overall view showing a hydraulic excavator according to a first embodiment of the present invention.

2 is a partially cutaway front view showing an enlarged cab and the like in FIG. 1. FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. 2, showing a buffer support.

FIG. 4 is a right side view of the hydraulic excavator shown in FIG. 1.

5 is an enlarged cross-sectional view taken along the arrow V-V in FIG.

FIG. 6 is an enlarged sectional view taken along the line VI-VI in FIG.

FIG. 7 is an enlarged cross-sectional view taken along the arrow VII-VII in FIG. 5 showing the vibration isolator.

FIG. 8 is a sectional view similar to FIG. 5, showing an operator's cab of the hydraulic excavator according to the second embodiment.

9 is an enlarged cross-sectional view taken along the line IX-IX in FIG.

FIG. 10 is a cross-sectional view similar to FIG. 5, showing a cab of a hydraulic excavator according to a third embodiment.

[Explanation of symbols]

 1 Lower Traveling Body 3 Upper Revolving Body 4 Revolving Frame (Main Body Frame) 6 Driver's Cab 8 Working Device 15 Driver's Cab Main Body 15A Floor Board 15B Front Face 15C Rear Face 15D Side Face 15E Upper Face 17 Shock Absorbing Support 18, 32, 48 Stopper 19 , 33, 49, 55 Anti-vibration rubber 24 Stopper 25 Ball 26, 42, 52 Vibration regulator 27, 46 Guide 31, 47 Anti-vibration body 41, 51 Rail (stopper) 44, 54 Bracket 45 Roller

Claims (2)

[Claims] 1. A main body frame of a working machine, and a front surface portion, a rear surface portion, which is disposed on the main body frame and is provided on a floor plate,
A driver's cab main body formed in a box shape from the left and right side surfaces and an upper surface, and provided between a floor plate of the cab main body and a main body frame, and vibrations from the main body frame are transmitted to the cab main body. In a driver's cab of a working machine composed of a plurality of buffer supports for buffering the above, a pair of stoppers which are spaced apart in the left-right direction and extend in the up-down direction are provided on the rear surface of the cab main body, and the main body frame is provided with a pair of stoppers. A vibration restricting body is provided between the stoppers to allow the driver's cab main body to vibrate in the vertical direction and to restrict the driver's cab main body from vibrating in the horizontal direction through a vibration-proof rubber. And the cab of the working machine. 2. The vibration regulation body is movably arranged in the up-down direction between the stoppers, and a guide whose movement in the left-right direction is regulated, and the guide is provided to the body frame via a vibration-proof rubber. 2. A vibration isolator to be attached
The cab of the work machine described in.