JPH08151661A - Working machine with operator's cab - Google Patents

Abstract

PURPOSE: To remarkably simplify a construction to provide vibration resistance in an operator's cab main body, and reduce a spring constant for vertical vibra tion. CONSTITUTION: A total of four sets of link mechanisms 17, 17,... are arranged between a swing frame 4 and a floor plate 15a of an operator's cab main body 15, apart from each other in the longitudinal and lateral directions. Each link mechanism 17 of them is formed with a lower side bracket 18 on the swing frame 4 side, an upper side bracket 19 on the floor plate 15A side of an operator's cab main body 15, and movable link 20 connected between a lower side bracket 18 and an upper side bracket 19 through first, second, and third connecting parts. Also a vibration resistance rubber is mounted on the second and third joint parts of these joints so as to form them as elastic joint parts. Then a parallel link is formed with longitudinal and lateral movable links 20 and others, and the movable links 20 of each link mechanism 17 are connected integrally through connecting pipes 21 and 22 in the lateral direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in a working machine such as a hydraulic excavator and the like, and is a working machine with a driver's cab for reducing vibration transmitted from a frame during traveling or working to enhance habitability of a driver's cab Regarding

[0002]

2. Description of the Related Art Generally, a frame of a working machine body and a box-like shape are formed from a front surface portion, a rear surface portion, left and right side surfaces and an upper surface portion which are arranged on the frame and are provided on a floor plate. A working machine with a driver's cab, which is provided between a driver's cab main body and a floor plate of the driver's cab main body and a frame, and includes a plurality of buffer supports for buffering vibrations from the frame transmitted to the driver's cab main body, For example, it is known from Japanese Utility Model Publication No. 61-89063.

That is, in a work machine with a driver's cab such as a hydraulic excavator according to the prior art of this type, vibrations such as an excavation reaction force generated during an excavation work of earth and sand and vibrations during traveling are transmitted to the driver's cab via a frame. Since the habitability of the operator in the driver's cab is deteriorated and the operability of the operating lever and the like is deteriorated, a plurality of buffer supports are provided between the floor plate of the cab main body and the frame, and Vibration is prevented from being transmitted to the cab body.

Here, as the buffer support provided between the floor plate of the cab body and the frame, for example, a combination of a vibration-proof rubber or a coil spring and an oil damper (shock absorber) is adopted. The buffer support is provided with a stopper so that the vibration width of the cab body reaches a stroke of, for example, about 2 to 3 mm. When the driver's cab body rolls laterally, the stopper has its vibration width within a predetermined stroke,
The cab body is prevented from colliding with a peripheral member on the frame, such as a boom cylinder.

[0005]

By the way, in the above-mentioned prior art, when the antivibration rubber is used as the buffer support, the antivibration rubber is normally compressed at a pressure of about several thousand kg / cm ² and hardened (spring). Since the vibration width of the driver's cab body is suppressed to a small value by setting the constant to a higher value), a large shock generated during excavation work such as rock mass or traveling on bad roads cannot be sufficiently buffered by the buffer support. However, there is a problem that the habitability in the driver's cab cannot be improved effectively.

Further, when a coil spring or the like is used as the buffer support, it is necessary to use an oil damper (shock absorber) or the like in order to obtain a vibration damping action, resulting in an increase in the number of parts and workability during assembly. There is a problem that can not be improved. Further, since the coil spring has a supporting ability in only one direction, it is necessary to combine it with a link mechanism or the like to limit horizontal vibration to a small level.
There is a problem that the structure becomes complicated and the cost increases.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can greatly simplify the structure for providing the driver's cab body with a vibration-proof property, and can reduce the cost. An object of the present invention is to provide a working machine with a driver's cab, which can reduce the spring constant with respect to vertical vibrations and can achieve the same vibration damping effect as a coil spring.

[0008]

In order to solve the above-mentioned problems, a working machine with a cab according to the invention described in claim 1 is a frame of a working machine main body, and is located on the frame, and is on the lower surface side. A driver's cab main body provided with a floor, and provided between the floor of the driver's cab main body and the frame, allow the driver's cab main body to vertically vibrate on the frame, and to vibrate horizontally. A link mechanism for regulating is provided, and the link mechanism includes one side bracket provided on the frame side, another side bracket provided on the floor side of the cab body, and at least first and first spaces between the brackets. 2 and a movable link connected via a third coupling section, and in each coupling section of the movable link, the interval between the first and second coupling sections is the first and the third coupling section. It is arranged so that it is smaller than the space between the joints, The second coupling portion is also adopts a configuration comprising a movable link as an elastic coupling portion for coupling via an elastic member for vibration proof with respect to the one side or the other side bracket.

In this case, as in the second aspect of the present invention, it is preferable that the third joint portion and the second joint portion are configured as an elastic joint portion.

Further, according to a third aspect of the present invention, in the link mechanism, one end side of the movable link is connected to the one side bracket via the first and second coupling parts to move the movable link. The other end of the link is connected to the other side bracket by the third
It is preferable to have a structure in which they are connected via the coupling part of.

Further, as in the invention described in claim 4,
The link mechanism connects one end side of the movable link to the one side bracket via the third coupling portion, and connects the other end side of the movable link to the other side bracket by the first and second couplings. It may be configured to be connected via a section.

Further, as in the invention described in claim 5, between the frame and the floor of the operator's cab body, the link mechanism is spaced apart to the front, rear, left and right of the operator's cab body. 4
The movable links of the link mechanisms that are provided as a set and are separated from each other in the front and rear sides form parallel links, and the movable links of the link mechanisms that are separated from each other to the left and right are mutually connected via a connecting member extending in the left-right direction. It is preferable to connect them.

[0013]

With the above construction, in the invention described in claim 1, the movable link of the link mechanism provided between the floor of the cab body and the frame is provided with the one side bracket on the frame side and the other side on the floor side. Since it is connected to the bracket via at least the first, second and third coupling portions, the cab main body can be supported on the frame so as to be vertically movable. When the vibration from the frame is transmitted to the driver's cab body, at least the vibration isolating elastic member provided in the second coupling portion is elastically deformed, so that the movable link is connected between the first and third coupling portions. Thus, the vibration transmitted to the driver's cab main body can be buffered while permitting the upward and downward rotation (swing), and the vibration of the driver's cab main body can be reliably reduced. In addition, the spacing between the first and second coupling portions of each coupling portion of the movable link is smaller than the spacing between the first and third coupling portions, so that the elastic member ( The spring constant of (provided in the second coupling portion) can be set small, and a large vibration damping (vibration damping) action can be obtained by the elastic member.

In this case, as in the second aspect of the present invention, the vibration from the frame is transmitted to the driver's cab body by configuring the third coupling portion as an elastic coupling portion together with the second coupling portion. When being transmitted, the movable link is pivoted up and down (swings) between the first and third coupling portions while elastically deforming the elastic members provided in the second and third coupling portions together.
Therefore, the vibration transmitted to the driver's cab main body can be more reliably buffered.

Further, as in the invention described in claim 3, one end side of the movable link is connected to the one side bracket via the first and second coupling portions, and the other end side of the movable link is connected to the other side. The movable bracket is pivoted up and down between the one side bracket and the other side bracket via the first and third coupling parts by connecting to the side bracket via the third coupling part. It is possible to oscillate), and at this time, at least at the second coupling portion (one side bracket) side, the vibration transmitting elastic member can be elastically deformed, and the vibration transmitted to the cab body can be reliably damped.

Furthermore, as in the invention described in claim 4,
One end side of the movable link is connected to the one side bracket via the third connecting portion, and the other end side of the movable link is connected to the other side bracket via the first and second connecting portions. Even in this case, the movable bracket can be turned up and down (swing) between the one-side bracket and the other-side bracket via the first and third coupling portions, and at this time, at least the second It is possible to reliably cushion the vibration transmitted to the cab body while elastically deforming the vibration-proof elastic member on the side of the coupling portion (other side bracket).

Further, as in the invention described in claim 5, between the frame and the floor portion of the operator's cab body, four sets of link mechanisms spaced apart to the front, rear, left and right of the operator's cab body are provided. By providing a parallel link with movable links of the link mechanisms separated from each other in the front and rear of the link mechanism, the longitudinal vibration acting on the driver's cab main body can be converted into the vibration in the vertical direction. Vibration of the body in the front-back direction (pitching)
Can be reliably suppressed. Further, the left and right movable links of the link mechanisms are connected to each other via the connecting member extending in the left-right direction, so that the left and right movable links rotate (swing) with different vertical displacement amounts. ) Can be reliably regulated, and the horizontal vibration (rolling) of the cab main body can be reliably suppressed by synchronizing the movements of the movable links.

[0018]

1 to 14, a hydraulic excavator will be described as an example of a working machine with a cab according to an embodiment of the present invention.

1 to 9 show a first embodiment of the present invention.

In the figure, 1 is an undercarriage, 2 is a revolving device, 3 is an upper revolving structure which is rotatably mounted on the undercarriage 1 via the revolving device 2 and constitutes a working machine body, The upper revolving structure 3 is composed of a revolving frame 4 as a 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 a front portion of the revolving frame 4 is provided. Is integrally provided with a mounting bracket (not shown) for the working device 8 which will be described later and is located on the right side of the operator's cab 6.

Further, as shown in FIGS. 2 and 3, the swivel frame 4 is made of a thick steel plate extending in a substantially rectangular shape from the central portion where the swivel device 2 and the like are mounted to the front, rear, left and right. And a supporting frame 4B having a substantially "U" -shaped or substantially "L" -shaped frame structure for supporting a later-described driver's cab body 15 together with the highly rigid part 4A. , A pair of lateral beams 4C, 4C that extend in the left-right direction of the cab main body 15 so as to bridge between the support frame 4B and the high-rigidity portion 4A, and are separated from each other in the front and rear sides. The surface is formed of a steel material or the like having a “U” shape.

Reference numeral 8 denotes a working device provided at the front part of the upper swing body 3, and the working device 8 is a boom 9 provided on the mounting bracket of the swing frame 4 so as to be able to move up and down, and a tip of the boom 9. Arm 10 that can be raised and lowered on the side
And a bucket 11 rotatably provided on the tip side of the arm 10, and these boom 9, arm 10 and bucket 11 are operated 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 driver's cab 6, and the driver's cab main body 15 is provided on the floor plate 15A as a floor and on the floor plate 15A, as shown in FIGS. Front part 15B, rear part 15C, left and right side parts 1
It is formed as a box-shaped cab box from 5D, 15D and the upper surface portion 15E. In addition, the driver's cab body 1
5, a side wall 15D on the right side is provided with a door 16 in the operator's cab main body 15 for opening and closing an operator for getting on and off. The operator cab body 15 is mounted on the high-rigidity portion 4A, the support frame 4B, and the horizontal beams 4C of the swivel frame 4 via link mechanisms 17 described later.

Reference numerals 17, 17, ... Indicate link mechanisms as buffer supports for cushioning the transmission of the impact from the revolving frame 4 to the cab body 15. Each link mechanism 17 and the floor plate 15A of the cab body 15 are As shown in FIG. 3, a total of four sets are provided between the swivel frame 4 and the front, rear, left, and right spaces.
The driver's cab main body 15 is allowed to vibrate in the vertical direction on the revolving frame 4 and is restricted from vibrating in the horizontal direction (front-back direction or left-right direction).

As shown in FIG. 2, each link mechanism 17 has a lower bracket 18 as a one-side bracket fixed to the horizontal beam 4C of the revolving frame 4 by means of welding or the like, and a driver's cab body 15 Upper bracket 19 serving as the other side bracket fixed to the floor plate 15A side by means of welding or the like, and the upper bracket 19 and the upper bracket 19 are rotated between the brackets 18 and 19 via coupling portions 23, 28 and 35 described later. The movable links 20 are movably (swingably) connected to each other, and each movable link 20 is formed of a steel plate or the like extending in a flat shape with a certain length in the front-rear direction of the cab body 15.

Further, each lower bracket 18 has a pair of left and right bracket plates 18A, 18A as shown in FIG. 18C is provided.
Then, on the rear end (one end) side of each movable link 20, the lower side corresponding to each pin hole 18B, 18C of the lower bracket 18,
The upper mounting holes 20A and 20B are drilled, and the lower mounting hole 2
The diameter of 0A is smaller than that of the upper mounting hole 20B.

Here, the pin holes 18B and 18C of each lower bracket 18 and the mounting holes 20 of each movable link 20.
A and 20B form a part of first and second joint portions 23 and 28 which will be described later, and the distance L1 between the joint portions 23 and 28 is set to the first and third joint portions 23 as shown in FIG. , 35 compared to the distance L2 between them, the dimension is set to, for example, 1/4 (L1≤L2 / 4) or less.

On the other hand, the upper bracket 19 has a pair of left and right bracket plates 19A, 19A as shown in FIG. 6, and each bracket plate 19A is provided with a pin hole 19B. A large-diameter mounting hole 20C corresponding to the pin hole 19B is bored on the front end (other end) side of each movable link 20, and the mounting hole 20C together with each pin hole 19B forms a third coupling portion 35. Form part of the.

Further, the movable link 20 of each link mechanism 17 separated from the front and rear of each link mechanism 17 constitutes a parallel link between the revolving frame 4 and the floor plate 15A as shown in FIG. When the vibration in the front-rear direction propagates (acts) from the driver's cab body 15 to the vibration in the up-and-down direction, the driver's cab body 15 is prevented from vibrating (pitching) in the front-rear direction. .

Reference numerals 21 and 22 denote connecting pipes serving as connecting members that connect the movable links 20 of the link mechanisms 17 in the left-right direction of the cab body 15. The connecting pipes 21 and 22 are made of a metal material having high rigidity. 2 and 4, the connecting pipe 21 is formed as a hollow pipe having a rectangular cross section, and the connecting pipe 21 located on the front side of the cab body 15 is parallel to the horizontal beam 4C of the revolving frame 4 as shown in FIG. Extends to the left and right movable links 20 and is joined by means such as welding. Further, the connecting pipe 22 located on the rear side of the operator's cab body 15 is smaller than the connecting pipe 21 on the front side so that the distance between the link mechanisms 17 on the rear side is smaller than that between the link mechanisms 17 on the front side. The movable links 2 are formed in a short length, and both ends of the left and right movable links 2 are behind the cab body 15.
No. 0 is joined by means such as welding.

When the left and right movable links 20 are integrally connected to each other by the connecting pipes 21 and 22, when a horizontal vibration or the like propagates (acts) from the revolving frame 4 to the cab body 15. In addition, the left and right movable links 20 are restricted from rotating (swinging) with different displacements in the vertical direction, and the movement of the movable links 20 is synchronized, whereby the cab main body 15 vibrates in the horizontal direction. It is designed to suppress (rolling).

Reference numeral 23 denotes a first joint portion in which the rear end side of the movable link 20 is rotatably pin-joined to the lower bracket 18, and the joint portion 23 is, as shown in FIG. Tubular pin 24 rotatably fitted in each pin hole 18B of 18 and the mounting hole 20A of the movable link 20, and the tubular pin 24 for each bracket plate 18 of the lower bracket 18.
The bolt 26 and the nut 27 are fastened between the bracket plates 18A via the washers 25 so as to be fixed to the bracket A. The bolt 26 is inserted into the tubular pin 24. Then, the connecting portion 23 has a cylindrical pin 24.
By this, the movable link 20 serves as a fulcrum that restricts relative displacement (positional displacement) of the lower bracket 18 upward and downward, and the movable link 20 is rotatably supported with respect to the lower bracket 18. ing.

Reference numeral 28 denotes a second joint portion in which the rear end side of the movable link 20 is pin-joined to the lower bracket 18,
As shown in FIG. 5, the connecting portion 28 is provided on the lower bracket 18
The cylindrical pins 29 inserted into the respective pin holes 18C and the mounting holes 20B of the movable link 20 and the bracket plates for fixing the cylindrical pins 29 to the bracket plates 18A of the lower bracket 18 respectively. 18A, bolts 30 and nuts 31 fastened via respective washers 25, and mounting holes for the inner ring 32 and movable link 20, which are located between the bracket plates 18A and are fitted on the outer peripheral side of the tubular pin 29. An outer ring 33 fitted in 20B and an elastic member formed as a tubular ring made of an elastic resin material and arranged between the outer ring 33 and the inner ring 32 by means of baking or the like for vibration isolation. And the anti-vibration rubber 34.

Here, the joint portion 28 constitutes an elastic joint portion by means of a vibration-proof rubber 34, etc., and the movable link 20 is displaced by vibration from the outside (up and down around the cylindrical pin 24 of the joint portion 23). This is compensated by elastic deformation (compressive deformation) of the vibration-proof rubber 34, as illustrated in FIGS. 8 and 9. Then, when the movable link 20 is rotationally displaced upward and downward due to external vibration, the vibration-proof rubber 34
Has a vibration damping function, and the vibration at this time is gradually attenuated.

Reference numeral 35 denotes a third connecting portion in which the front end side of the movable link 20 is pin-connected to the upper bracket 19.
As shown in FIG.
The cylindrical pins 36 inserted into the respective pin holes 19B and the mounting holes 20C of the movable link 20, and the bracket plates 19A for fixing the cylindrical pins 36 to the bracket plates 19A of the upper bracket 19 respectively. Bolts 37 and nuts 38 that are fastened via the washers 25 therebetween, inner rings 39 that are located between the bracket plates 19A and are fitted on the outer peripheral side of the tubular pins 36, and mounting holes 20C for the movable link 20. As an elastic member for vibration damping, which is formed as a tubular ring made of an elastic resin material and is fitted into the outer ring 40, and which is arranged between the outer ring 40 and the inner ring 39 by means of baking or the like. And a vibration-proof rubber 41.

The connecting portion 35 also constitutes an elastic connecting portion by means of the vibration-proof rubber 41 and the like, and prevents the movable link 20 from rotating upward and downward by external vibration together with the vibration-proof rubber 34. Compensation is made by elastic deformation (compression deformation) of the vibrating rubber 41. In this case, the anti-vibration rubber 41 also exerts a vibration-damping (anti-vibration) action almost similarly to the anti-vibration rubber 34, and when the movable link 20 is displaced upward and downward by external vibration, the anti-vibration rubber is provided. The vibration 41 at this time is gradually attenuated by 41.

Here, the first to third coupling portions 23, 28,
As shown in FIG. 4, reference numeral 35 denotes an interval L between the connecting portions 23 and 28.
Since 1 is set to have a dimension of, for example, 1/4 (L1 ≤ L2 / 4) or less as compared with the distance L2 between the coupling portions 23 and 35, vibration isolation using the second coupling portion 28 as an elastic coupling portion. Rubber 34
For example, the movable link 20 is rotatably (oscillated) supported with a small spring constant of about 1/4 or less as compared with the anti-vibration rubber 41 provided in the third coupling portion 35.

The hydraulic excavator according to the present embodiment has the above-described structure, and is different from the prior art in that the lower traveling body 1 travels on the road and the working device 8 excavates earth and sand. There is no difference.

Therefore, the vibration reducing action of the cab body 15 which is a feature of this embodiment will be described.

First, the vibration due to the excavation reaction force from the bucket 11 and the vibration during traveling are transmitted to the operator's cab body 15 via the revolving frame 4, and the operator's cab body 15 moves back and forth around its center of gravity (not shown). When vibrating (pitching) in the direction, a total of four sets of link mechanisms 17, 17, ... Are provided between the swivel frame 4 and the operator's cab body 15 so as to be spaced apart to the front, rear, left, and right. Since the rear movable links 20 and the like form a parallel link, the movable links 20 rotate (swing) up and down between the brackets 18 and 19 to cause vibration in the front-rear direction. The vibrations in the vertical direction can be reliably converted, and the vibration (pitching) of the cab body 15 in the front-rear direction can be effectively suppressed.

When the driver's cab main body 15 rolls laterally (rolling), each link mechanism 1
The movable link 20 of 7 connects the left and right pipes 21, 22
The left and right movable links 20 are integrally connected by
Is restricted from rotating (swinging) with different displacements in the up-down direction, the left and right movable links 20 are identical in the up-down direction by the connecting pipes 21 and 22 even with respect to left-right vibrations. To rotate (swing) with the amount of displacement of
The horizontal vibration can be surely converted into the vertical vibration, and by synchronizing the movements of the movable links 20, the horizontal vibration (rolling) of the cab body 15 can be effectively suppressed.

That is, according to this embodiment, each link mechanism 1
The movable link 20 of No. 7 is provided between the lower bracket 18 and the upper bracket 19 to connect the first to third coupling portions 23, 28, 35.
Since the second and third coupling portions 28 and 35 are provided with vibration-proof rubbers 34 and 41 as elastic coupling portions, the movable link 20 of each link mechanism 17 is By vibrating from the outside, for example, elastically deforming (compressing and deforming) the vibration-proof rubber 34 of the second coupling portion 28 as shown in FIGS. It comes to be rotationally displaced in the direction (downward).

As a result, the movable link 20 of each link mechanism 17 converts both longitudinal and lateral vibrations into vertical vibrations while elastically deforming (compressing and deforming) the anti-vibration rubbers 34 and 41. , The anti-vibration rubber 34, 41
The vibration damping (vibration isolation) effect can be exerted at the time, the vibration at this time can be gradually attenuated, and the cab main body 15 vibrates in the front-rear direction (pitching) and rolls in the left-right direction (rolling). Can be effectively prevented.

Particularly, the first to third coupling portions 23, 28, 3
As shown in FIG. 4, reference numeral 5 indicates the distance L1 between the connecting portions 23 and 28 compared with the distance L2 between the connecting portions 23 and 35, which is, for example, 1 /
Since the dimensions are set to 4 (L1 ≤ L2 / 4) or less,
The spring constant of the anti-vibration rubber 34 having the second coupling portion 28 as the elastic coupling portion is set to be equal to, for example, the anti-vibration rubber 4 provided in the third coupling portion 35.
It can be reduced to about 1/4 or less as compared with 1, and the cab body 15 can be supported on the revolving frame 4 with a relatively small spring constant.

Therefore, according to this embodiment, it is possible to effectively vibrate (pitch) the driver's cab body 15 in the front-rear direction or roll (roll) in the left-right direction at the time of traveling and working by the hydraulic excavator. In addition to being able to prevent, the cab body 15 can be supported on the revolving frame 4 with a relatively small spring constant, and the cab 6 (the cab body 15)
It is possible to greatly improve the habitability of the operator inside and the operability of the operation lever and the like.

Further, it is only necessary to dispose a total of four sets of link mechanisms 17, 17 ... Separated between the revolving frame 4 and the driver's cab main body 15 in the front, rear, left, and right, and the driver's cab main body 15 It is not necessary to combine an oil damper or the like with the coil spring as in the prior art, and the vibration isolation structure of the cab body 15 can be greatly simplified and the number of parts can be reliably reduced. Therefore, cost reduction can be achieved. Further, by disposing the first to third coupling portions 23, 28, and 35 as shown in FIG. 4, the spring constant for the vertical vibration can be reduced, and the vibration damping effect equivalent to that of the coil spring can be obtained. And so on.

Next, FIG. 10 shows 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 will be omitted. And
However, the feature of this embodiment is that each link mechanism 51 arranged between the swivel frame 4 and the cab body 15 is provided with the lower bracket 18, the upper bracket 19, and the movable link 52.
The lower and upper mounting holes 52A and 52B are formed on the rear end (one end) side of the movable link 52, and the mounting hole 52C is formed on the front end (other end) side of the movable link 52. However, the mounting holes 52A and 52C have a smaller diameter than the mounting hole 52B.

Here, the movable link 52 is formed in the same manner as the movable link 20 described in the first embodiment except for the mounting hole 52C, and the rear end side of the movable link 52 is provided on the lower bracket 18 with the first and second parts. It is connected via the second coupling portions 23 and 28. However, the front end side of the movable link 52 is connected to the upper bracket 19 via the third connecting portion 53, and the connecting portion 53 is constituted by the cylindrical pin 54, the bolt 55 and the like in substantially the same manner as the first connecting portion 23. Has been done.

Thus, in this embodiment having the above-described structure, it is possible to obtain substantially the same effect as that of the first embodiment. However, particularly in this embodiment, the front end side of the movable link 52 is provided with the upper bracket. Third coupling portion 53 connected to 19
Is composed of the tubular pin 54, the bolt 55, etc. almost in the same manner as the first coupling portion 23, so that only the second coupling portion 28 serves as the elastic coupling portion and the movable link 52 includes the bracket 18,
It is possible to rotate upward and downward between 19 and to simplify the configuration of the third coupling portion 53 to further surely reduce the cost.

Next, FIG. 11 shows a third embodiment of the present invention. In this embodiment, the same components as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted. And
However, the feature of this embodiment is that each link mechanism 61 arranged between the swivel frame 4 and the operator cab body 15 is provided with a lower bracket 18, an upper bracket 19, and a movable link 62.
The upper and lower mounting holes 62A and 62B are formed on the rear end (one end) side of the movable link 62, and the mounting hole 62C is formed on the front end (other end) side of the movable link 62. The mounting hole 62C and the mounting hole 62A are formed to have a small diameter, and the mounting hole 62B is formed to have a larger diameter than the mounting holes 62A and 62C.

The movable link 62 has a mounting hole 62A,
62B is formed in the same manner as the movable link 52 described in the second embodiment except the hole diameter of 62B. The rear end side of the movable link 62 has a mounting hole 62A through a first coupling portion 63 and a lower bracket. The mounting hole 62 </ b> B is connected to the lower bracket 18 via the second connecting portion 64. Further, the front end side of the movable link 62 is connected to the upper bracket 19 via the third connecting portion 53 as in the second embodiment.

The movable link 62 is the bracket 1
8 and 19 are rotatably pin-coupled via the first and third coupling portions 63 and 53, and the first coupling portion 63 located on the upper side at the rear end side of the movable link 62 is the third coupling portion. Similar to the portion 53, it is configured by a cylindrical pin 65, a bolt 66, and the like. Further, the second connecting portion 64 located on the lower side at the rear end side of the movable link 62 becomes an elastic connecting portion, and like the second connecting portion 28 described in the first embodiment, the tubular pin 6 is formed.
7, a bolt 68 and a nut (not shown), and an inner ring 69 located between the bracket plates 18A and fitted on the outer peripheral side of the tubular pin 67, and a mounting hole 62B for the movable link 62.
It is composed of an outer ring 70 fitted inside, and a vibration-proof rubber 71 as an elastic member for vibration isolation, which is arranged between the outer ring 70 and the inner ring 69 by means of baking or the like.

Thus, in this embodiment having such a structure, it is possible to obtain substantially the same operation and effect as in the second embodiment, but particularly in this embodiment, the movable link 62 is lowered on the rear end side. The second linking portion 64 provided in the mounting hole 62B on the side is used as the elastically coupling portion to mount the movable link 62 on the bracket 1.
It can be turned up and down between 8 and 19, and the first and third connecting portions 6
It is possible to reduce the cost by simplifying the configurations of 3, 53.

Next, FIG. 12 shows a fourth embodiment of the present invention. In this embodiment, the same components as those of the second embodiment are designated by the same reference numerals and the description thereof will be omitted. And
However, the feature of this embodiment is that each link mechanism 81 arranged between the swivel frame 4 and the operator's cab body 15 is provided with the lower bracket 18, the upper bracket 19, and the movable link 82.
And lower mounting holes 82A and 82B are formed on the rear end (one end) side of the movable link 82, and mounting holes 82C are formed on the front end (other end) side of the movable link 82. Both of the mounting holes 82A and 82B have a larger diameter than the mounting hole 82C.

Here, the movable link 82 is formed in substantially the same manner as the movable link 52 described in the second embodiment except the mounting hole 82A, and the mounting hole 82B of the movable link 82 is formed in the second.
The mounting hole 82C is connected to the upper bracket 19 via the third connecting portion 53, while being connected to the lower bracket 18 via the connecting portion 28. However, the mounting hole 82A of the movable link 82 is connected to the lower bracket 18 via the first coupling portion 83.

Then, the first coupling portion 83 is connected to the second
Like the coupling portion 28 of the cylindrical pin 84, it becomes an elastic coupling portion.
, The bolt 85 and the nut (not shown), and the inner ring 86 located between the bracket plates 18A and fitted on the outer peripheral side of the tubular pin 84 and the mounting hole 82A of the movable link 82. It is composed of an outer ring 87 and a vibration-proof rubber 88 as an elastic member for vibration isolation, which is arranged between the outer ring 87 and the inner ring 86 by means of baking or the like.

In this way, in this embodiment having the above-mentioned structure, it is possible to obtain substantially the same effects as the second embodiment. However, in this embodiment in particular, it is provided on the rear end side of the movable link 82. Since the first and second coupling portions 83 and 28 are both configured as elastic coupling portions, the vibration damping rubbers 88,
34 makes it possible to effectively enhance the vibration damping (vibration damping) action.

Next, FIG. 13 shows a fifth 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 will be omitted. And
However, the feature of this embodiment is that each link mechanism 91 disposed between the swivel frame 4 and the operator cab body 15 is provided with a lower bracket 92 as one side bracket, an upper bracket 19 as another side bracket, and a movable bracket. The movable link 93 is configured by a link 93, and the rear end (one end) side of the movable link 93 is connected to the lower bracket 92 via the first and second coupling portions 23, 28, and the front end (other end) of the movable link 93. The side is connected to the upper bracket 19 via the third coupling portion 35.

Here, the lower bracket 92 has a pair of bracket plates 92A (only one is shown), which is similar to the lower bracket 18 described in the first embodiment. Each of the bracket plates 92A has a pair of bracket plates 92A. Pin holes (both not shown) are drilled at regular intervals on the bottom and top. However, each bracket plate 92A of the lower bracket 92 is formed so as to obliquely project from the upper side to the lower side so that the projecting dimension on the lower side is larger than that on the upper side, and between the pin holes (coupling portions 23, 28). The distance L3 between the first and third coupling portions 23,
Compared with the interval L4 between 35, for example, 1/4 (L3 ≤ L
4/4) The following dimensions are set.

Further, at the rear end side of the movable link 93, lower and upper mounting holes (both not shown) are formed corresponding to the respective pin holes of the lower bracket 92, and the lower mounting holes are provided in the mounting holes. Is the first
The connecting portion 23 is attached, and the second connecting portion 28 is attached in the upper mounting hole. The pin hole 1 of the upper bracket 19 is provided on the front end side of the movable link 93.
9B (see FIG. 6) is provided with a mounting hole (not shown), and the third coupling portion 35 is mounted in this mounting hole.

Thus, also in this embodiment having such a configuration, of the coupling portions 23, 28 and 35 for coupling the movable link 93 to the brackets 92 and 19, for example, the coupling portion 28,
By using 35 as the elastic coupling portion, it is possible to obtain substantially the same operational effect as that of the first embodiment.

Next, FIG. 14 shows a sixth 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 will be omitted. And
However, the feature of the present embodiment is that each link mechanism 101 arranged between the swivel frame 4 and the operator cab body 15 is provided with a lower bracket 102 as one side bracket, an upper bracket 103 as another side bracket, and a movable bracket. Link 10
4, the movable link 104 has a front end (the other end).
The first and second coupling parts 10 are attached to the upper bracket 103 on the side.
5, 106 and the movable link 104
The rear end (one end) side is connected to the lower bracket 102 via the third connecting portion 107.

Here, the lower bracket 102 is the first bracket.
Although it has a pair of bracket plates 102A (only one is shown) similar to the lower bracket 18 described in the above embodiment, each bracket plate 102A has a single pin hole (not shown) at the center thereof. Has been drilled. Further, the upper bracket 103 has a pair of bracket plates 103A (only one is shown) projecting relatively downwardly, and each of the bracket plates 103A has a pin hole (both not shown) at a certain distance above and below. ) Has been drilled.

Further, at the front end side of the movable link 104, lower and upper mounting holes (both not shown) are formed corresponding to the respective pin holes of the upper bracket 103, and the above-mentioned mounting holes are provided in the lower mounting holes. A coupling portion 105 which is substantially the same as the first coupling portion 23 described in the first embodiment is mounted, and a coupling portion 106 which is substantially similar to the second coupling portion 28 in the upper mounting hole.
Is installed. Further, a mounting hole (not shown) is formed on the rear end side of the movable link 104 so as to correspond to the pin hole of the lower bracket 102, and this mounting hole is substantially the same as the third coupling portion 35. A coupling portion 107 is attached. The distance L5 between the first and second coupling portions 105 and 106 is equal to the distance L5 between the first and third coupling portions 105 and 107.
Compared with 6, the size is set to, for example, 1/4 (L5≤L6 / 4) or less.

Thus, also in this embodiment configured as described above, for example, of the connecting portions 105, 106 and 107 connecting the movable link 104 to the brackets 102 and 103, the connecting portions 106 and 107 are elastic connecting portions. Due to
It is possible to obtain substantially the same operational effects as those of the first embodiment.

In the fifth and sixth embodiments, the first, second and third coupling portions 23, 28, 35 (105, 1)
06, 107), for example, the connecting portions 28, 35 (10
6, 107) as the elastic joint,
The present invention is not limited to this, and the position of the elastic coupling portion may be appropriately changed as in the second, third, and fourth embodiments.

Further, in the above-mentioned respective embodiments, the revolving frame 4
Although it has been described that the four sets of link mechanisms 17 (51, 61, 81, 91, 101) are provided between the vehicle and the floor of the cab body 15 (floor plate 15A), the present invention is not limited to this. ,
For example, one to three sets or five or more sets of link mechanisms may be arranged between the revolving frame 4 and the floor portion (floor plate 15A) of the operator cab body 15.

Furthermore, in each of the above-mentioned embodiments, the first, second, and
The third coupling portions 23, 28, 35 (63, 64, 105,
106, 107) and the like, for example, the coupling portions 28, 35
Although (63, 106, 107) and the like are described as the elastic coupling portions, the present invention is not limited to this, and for example, the first, second, and third coupling portions may all be configured as elastic coupling portions. Good. Moreover, in addition to the first, second, and third coupling portions, a fourth coupling portion or the like may be appropriately provided.

[0069]

As described in detail above, according to the first aspect of the invention, the movable link of the link mechanism provided between the floor of the cab body and the frame is connected to the one side bracket on the frame side. It is connected to the other bracket on the floor side through at least first, second and third connecting portions, and at least the second connecting portion among the connecting portions is an elastic connecting portion for vibration damping. Since the elastic member is provided, the cab main body can be supported on the frame so as to be movable in the vertical direction, and the structure for imparting vibration damping to the cab main body can be greatly simplified to reduce the cost. Can be planned.

When the vibration from the frame is transmitted to the driver's cab body, at least the vibration isolating elastic member provided in the second coupling portion is elastically deformed, so that the movable link has the first and third movable links. The vibration transmitted to the driver's cab main body can be buffered while permitting the upward and downward rotation (swing) between the coupling portions, and the vibration of the driver's cab main body can be reliably reduced. In addition, the distance between the first and second coupling portions of the coupling portions of the movable link is set smaller than the distance between the first and third coupling portions, so that the distance between The spring constant of the elastic member can be set small, and a vibration damping effect similar to that of a coil spring can be obtained.

In this case, as in the second aspect of the present invention, the vibration from the frame is transmitted to the driver's cab main body by configuring the third coupling part together with the second coupling part as an elastic coupling part. When being transmitted, the movable link is pivoted up and down (swings) between the first and third coupling portions while elastically deforming the elastic members provided in the second and third coupling portions together.
Therefore, the vibration transmitted to the driver's cab body can be more effectively buffered.

Further, as in the invention described in claim 3,
One end of the movable link is attached to the one side bracket to provide the first and second brackets.
By connecting the other end side of the movable link to the other side bracket via the third connecting section, thereby connecting the one side bracket and the other side bracket to each other. The movable bracket can be turned up and down (swinged) through the joint portion 3 and at this time, at least at the second joint portion (one side bracket) side, the elastic member for vibration isolation is elastically deformed. The vibration transmitted to the driver's cab body can be effectively dampened.

Further, as in the invention described in claim 4,
One end side of the movable link is connected to the one side bracket via the third connecting portion, and the other end side of the movable link is connected to the other side bracket via the first and second connecting portions. Even in this case, the movable bracket can be turned up and down (swing) between the one-side bracket and the other-side bracket via the first and third coupling portions, and at this time, at least the second It is possible to effectively cushion the vibration transmitted to the cab body while elastically deforming the vibration-proof elastic member on the side of the coupling portion (other side bracket).

Further, as in the invention described in claim 5, between the frame and the floor portion of the operator's cab body, there are four sets of link mechanisms spaced apart to the front, rear, left and right of the operator's cab body. By providing a parallel link with movable links of the link mechanisms separated from each other in the front and rear of the link mechanism, the longitudinal vibration acting on the driver's cab main body can be converted into the vibration in the vertical direction. Vibration of the body in the front-back direction (pitching)
Can be reliably suppressed. Further, the left and right movable links of the link mechanisms are connected to each other via the connecting member extending in the left-right direction, so that the left and right movable links rotate (swing) with different vertical displacement amounts. ) Can be reliably regulated, and the horizontal vibration (rolling) of the cab main body can be surely suppressed by synchronizing the movements of the movable links.

[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 an enlarged external view of a driver's cab or the like, showing a part of the swivel frame and the driver's cab body in FIG. 1 along a line II-II in FIG.

FIG. 3 is a bottom view of the swivel frame and the cab body shown in FIG.

FIG. 4 is a partial cross-sectional view showing a link mechanism in FIG. 2 in an enlarged manner.

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

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

FIG. 7 is a sectional view taken along line VII-VII in FIG.

8 is a vertical cross-sectional view of the link mechanism showing a state where the movable link in FIG. 4 is displaced downward and the vibration-proof rubber is elastically deformed.

9 is a cross-sectional view similar to FIG. 7 showing an enlarged main part in FIG.

FIG. 10 is a longitudinal sectional view showing a link mechanism according to a second embodiment, which is substantially similar to FIG.

FIG. 11 is a vertical cross-sectional view similar to FIG. 8 showing a link mechanism according to a third embodiment.

FIG. 12 is a cross-sectional view similar to FIG. 8 showing a link mechanism according to a fourth embodiment.

13 is a partial cross-sectional view similar to FIG. 4 showing a link mechanism according to a fifth embodiment.

14 is a partial cross-sectional view similar to FIG. 4 showing a link mechanism according to a sixth embodiment.

[Explanation of symbols]

4 Revolving frame (frame) 6 Driver's cab 15 Driver's cab body 15A Floor plate (floor) 17, 51, 61, 81, 91, 101 Link mechanism 18, 92, 102 Lower bracket (one side bracket) 19,103 Upper bracket (Other side bracket) 20, 52, 62, 82, 93, 104 Movable link 23, 63, 83, 105 First coupling portion 28, 64, 106 Second coupling portion 34, 41, 71, 88 Anti-vibration rubber (Elastic member) 35, 53, 107 Third coupling portion

Claims (5)

[Claims] 1. A frame of a working machine main body, a driver's cab main body that is located on the frame and has a floor on the lower surface side, and a frame provided between the floor and the frame of the driver's cab main body. A link mechanism that allows the driver's cab main body to vertically vibrate and regulates horizontal vibration, and the link mechanism includes one side bracket provided on the frame side;
The other side bracket provided on the floor side of the operator's cab body, and a movable link connected between the brackets via at least first, second and third coupling parts, and the movable link. The respective coupling portions are arranged such that the distance between the first and second coupling portions is smaller than the distance between the first and third coupling portions, and at least the second coupling portion is A working machine with a cab, wherein the movable link is configured as an elastic coupling part that connects the movable link to the one side bracket or the other side bracket via an elastic member for vibration isolation. 2. The work machine with a cab according to claim 1, wherein the third joint portion is configured as an elastic joint portion together with the second joint portion. 3. The link mechanism connects one end side of the movable link to the one side bracket via the first and second coupling portions, and the other end side of the movable link to the other side bracket. The working machine with a cab according to claim 1 or 2, wherein the working machine is connected via the third coupling portion. 4. The link mechanism connects one end side of the movable link to the one side bracket via the third coupling portion, and the other end side of the movable link to the other side bracket by the first side. , The working machine with a cab according to claim 1 or 2, wherein the working machine is connected via a second coupling portion. 5. Four sets of the link mechanisms are provided between the frame and the floor of the cab body, spaced apart to the front, rear, left, and right of the cab body. The movable links of the link mechanisms separated from each other in the front and rear sides form parallel links, and the movable links of the link mechanisms separated from each other in the left and right directions are connected to each other via a connecting member extending in the left-right direction. The working machine with a cab according to 2, 3, or 4.