JP2003321851A - Operator cab vibration absorber of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operator cab removing an unpleasant feeling imparting to operators and improving operability by preventing or relieving a lateral vibration even when a horizontal force works due to a revolving motion. <P>SOLUTION: In a construction machine in which an upper revolving body is rotatably mounted on a lower traveling body, and an operator cab is mounted on the upper revolving body, a support device is interposed between the operator cab and a revolving frame constituting the upper revolving body and lateral vibrations are prevented by equipping a kinetic vibration-absorber in the operator cab. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operator cab of a construction machine, and more particularly to a vibration absorbing device for the operator cab.

[0002]

2. Description of the Related Art An operator cab of a construction machine is usually placed on a revolving frame which constitutes an upper revolving structure, and in a case where the operator cab is directly placed on the revolving frame, vibration generated by rotation of an engine is generated. Is transmitted to the operator cab directly through the turning frame, which causes an operator discomfort and affects operability. In order to alleviate the vibration generated by the rotation of the engine from being transmitted to the operator cab through the swing frame, a support device called an antivibration mount is currently interposed between the swing frame and the operator cab. However, when the operator cab is placed on the swivel frame via this support device, when a swing with a frequency close to the natural frequency of the support device is transmitted from the swivel frame, the operator cab resonates and the swing is further amplified. There was a problem of being done. Also, this support device called an anti-vibration mount effectively acts against vertical vibrations and reduces the transmission of vibrations generated by the engine to the operator cab, but horizontal forces due to turning etc. act. As a result, there is a problem in that it rolls, makes the operator uncomfortable, and adversely affects the operability.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and its purpose is to prevent resonance of an operator cab and to prevent or alleviate rolling when horizontal force due to turning or the like acts. Then, it is an object of the present invention to provide an operator cab which removes the discomfort given to the operator and improves the operability.

[0004]

The present invention adopts the following configuration as means for solving the above problems. That is, the invention according to claim 1 is a construction machine in which an upper revolving structure is rotatably mounted on a lower traveling structure, and an operator cab is mounted on the upper revolving structure, and the operator cab and the upper revolving structure are configured. A vibration absorbing device for an operator cab of a construction machine in which a supporting device is inserted between rotating frames and a dynamic vibration absorber is attached to the operator cab.

According to a second aspect of the present invention, the dynamic vibration absorber is provided with a liquid chamber and a gas chamber on the left and right in a front view of the operator cab, and the left and right liquid chambers and the left and right gas chambers are respectively connected by communication pipes. This is an operator cab vibration absorber for a construction machine.

According to a third aspect of the present invention, the dynamic vibration absorber is provided with a liquid chamber and a gas chamber on the left and right when the operator cab is viewed from the front, and an opening is formed by a partition plate that partitions the left and right liquid chambers and the left and right gas chambers. This is an operator cab vibration absorber for a construction machine, which is made to communicate with each other through holes.

According to a fourth aspect of the present invention, the dynamic vibration absorber is provided with a liquid chamber and a gas chamber at the front and rear in a side view of the operator cab, and the front and rear liquid chambers and the front and rear gas chambers are respectively connected by communication pipes. This is an operator cab vibration absorber for construction machinery.

According to a fifth aspect of the present invention, the dynamic vibration absorber is provided with a liquid chamber and a gas chamber at the front and rear in a side view of the operator cab, and an opening is formed by a partition plate for partitioning the liquid chamber at the front and rear and the gas chamber at the front and rear. This is an operator cab vibration absorber for a construction machine, which is made to communicate with each other through holes.

According to a sixth aspect of the present invention, there is provided an operator cab vibration absorbing device for a construction machine, wherein the dynamic vibration absorber is incorporated in at least one of a cab ceiling, a cab floor and a cab rear face plate constituting a cab frame.

[0010]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of the entire hydraulic excavator adopting the present invention, and FIG. 2 is a front view of an operator cab adopting the present invention. FIG. 3 is a schematic front view of an operator cab of an embodiment according to the present invention, and FIG. 4 is a dynamic vibration absorber diagram of the embodiment according to the present invention. FIG. 5 is a schematic side view of an operator cab according to another embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a lower traveling body, an upper revolving structure 2 is rotatably mounted on the lower traveling structure 1, and an operator cab 3 is provided on the front left side of the upper revolving structure 2. An attachment 4 is pivotally attached to the center of the front part of the upper swing body 2 so as to be able to move upward and downward. In FIG. 2, reference numeral 5 denotes a revolving frame, and a plurality of supporting devices 6 are provided on the revolving frame 5.
The operator cab 3 is placed via a, 6b ... An operator seat 7 is installed at a substantially central portion of the operator cab 3, and control stands 8 are fixedly installed on both sides of the operator seat 7.
In FIGS. 3 and 4, a dynamic vibration reducer 9 is fixedly installed at the rear portion of the operator seat 7, and the dynamic vibration reducer 9 connects the left and right tanks 9L and 9R with two communication pipes 9U and 9D. Of the tanks 9L and 9R and the lower communication pipe 9D are filled with liquid, and the upper and lower tanks 9L and 9R are filled with gas and the upper communication pipe 9U is filled with gas. . Further, in FIG. 5, tanks 9L 'and 9R'
When a dynamic vibration reducer 9 ′ having a front and a rear is installed on the floor of the operator cab 3, the dynamic vibration reducer 9 ′ has a front and a rear tank 9a.
L'and 9R 'are communicated with two upper and lower communication pipes 9U' and 9D ', and substantially lower halves of the front and rear tanks 9L' and 9R 'and a liquid chamber filled with liquid in the lower communication pipe 9D' and the front and rear Tank 9L ',
The upper half of 9R 'and the upper communication pipe 9U' are constituted by a gas chamber filled with gas. In addition, tanks 9L ", 9
The operator cab 3 is provided with a dynamic vibration absorber 9 "having R" at the front and rear.
When installed on the ceiling of the above, the dynamic vibration absorber 9 "connects the front and rear tanks 9L" and 9R "with two upper and lower communication pipes 9U" and 9D ", and is substantially below the front and rear tanks 9L" and 9R ". Liquid chamber filled with liquid in half and lower communication pipe 9D "and front and rear tanks 9
The upper half of L ″ and 9R ″ and the upper communication pipe 9U ″ are constituted by a gas chamber filled with gas.

Next, the operation of the present invention will be described. 3 and 4, when an engine (not shown) is started, the vibration generated by the rotation of the engine is transmitted to the revolving frame 5 directly or via the engine frame, and further via the supporting devices 6a, 6b .... Is transmitted to the operator cab 3. Since the support devices 6a, 6b ... Are shock absorbers that absorb the vibrations of springs and the like, most of the vibrations generated by the engine are absorbed by the support devices 6a, 6b ... And transmitted to the operator cab 3. There are few. But,
Occasionally, when a frequency close to the natural frequency of the supporting devices 6a, 6b ... Is transmitted from the revolving frame, the operator cab 3 may resonate and the swing may be further amplified. Even in such a case, the vibration energy can be absorbed by the movement of the liquid in the dynamic vibration reducer 9, and the resonance can be prevented. Further, at the start and stop of turning, horizontal force acts on the operator cab 3, and the supporting device 6
The rolling of the operator cab 3 cannot be prevented only by using a, 6b, ..., However, by mounting the dynamic vibration reducer 9, the rolling can be reduced. That is, when turning, a reaction force is applied to the operator cab 3 in the direction opposite to the turning direction, and a horizontal force acts especially when turning starts and when turning stops, but energy is absorbed by the dynamic vibration reducer 9 to reduce rolling. be able to. In the operator cab front schematic view of FIG. 3, for example, when turning right, horizontal force acts on the operator cab 3 from the left to the right in the figure, and the liquid in the left tank 9L of the dynamic vibration absorber 9 flows through the lower communication pipe 9D. To the right side tank 9R, and the gas in the right side tank 9R flows to the left side tank 9L via the upper communication pipe 9U to balance the horizontal force, absorb the turning energy, and reduce the rolling. . On the other hand, in the schematic side view of the operator cab of FIG. 5 as well, when the operator cab 3 is turned to the right, a horizontal force acts on the operator cab 3 from the left to the right in the figure, and the dynamic vibration absorber 9 ′ installed on the floor of the operator cab 3 is used. The liquid in the front tank 9L 'flows to the rear tank 9R' via the lower communication pipe 9D ', and the gas in the rear tank 9R' flows to the front tank 9L 'via the upper communication pipe 9U' to generate a horizontal force. On the other hand, it is possible to achieve a balance, absorb the turning energy, and reduce the sway in the front-back direction. Further, the liquid in the front tank 9L ″ of the dynamic vibration absorber 9 ″ attached to the ceiling of the operator cab 3 flows to the rear tank 9R ″ through the lower communication pipe 9D ″, and the gas in the rear tank 9R ″ communicates to the upper side. It can flow to the front tank 9L ″ through the pipe 9U ″, balance the horizontal force, absorb the turning energy, and reduce the sway in the front-rear direction.

By combining the types of liquid and gas in the dynamic vibration absorber, it is possible to deal with various vibrations and rolls, and it is not possible to connect the left and right tanks or the front and rear tanks with a communication pipe. Alternatively, the partition plate may be provided with an opening, and the dynamic vibration absorber may be attached to the operator cab alone or may be incorporated in a part of the operator cab frame.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the technical scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. Of course, and of course, the invention extends to such modifications.

[0015]

According to the present invention, the structure described in detail in the above-described embodiment absorbs energy by the dynamic vibration reducer to reduce or prevent resonance and rolling of the operator cab, thereby making the operator uncomfortable. Can be removed, and the operability can be improved, resulting in a very remarkable effect.

[Brief description of drawings]

FIG. 1 is a side view showing an entire hydraulic excavator adopting the present invention.

FIG. 2 shows a front view of an operator cab adopting the present invention.

FIG. 3 is a schematic front view of an operator cab according to the embodiment of the present invention.

FIG. 4 shows a vibration absorber according to an embodiment of the present invention.

FIG. 5 shows a schematic side view of an operator cab according to another embodiment of the present invention.

[Explanation of symbols] 1 Undercarriage 2 Upper revolving structure 3 operator cab 5 swivel frames 6a, 6b, 6c support device 9,9 ', 9 "dynamic vibration absorber 9L, 9R tank 9L ', 9R' tanks 9L ", 9R" tanks 9U, 9D communication pipe 9U ', 9D' communication pipe 9U ", 9D" communication pipe

Claims (6)

[Claims] 1. In a construction machine in which an upper revolving structure is rotatably mounted on a lower traveling structure and an operator cab is mounted on the upper revolving structure, between the operator cab and a revolving frame forming the upper revolving structure. While inserting the support device into
An operator cab vibration absorber for a construction machine, wherein a dynamic vibration absorber is attached to the operator cab. 2. A liquid chamber and a gas chamber are provided on the left and right of the dynamic vibration reducer when the operator cab is viewed from the front, and the left and right liquid chambers are provided.
2. The operator cab vibration absorber for a construction machine according to claim 1, wherein the left and right gas chambers are respectively connected by communication pipes. 3. A liquid chamber and a gas chamber are provided on the left and right of the dynamic vibration reducer when the operator cab is viewed from the front, and the liquid chambers on the left and right are provided.
2. The operator cab vibration absorber for a construction machine according to claim 1, wherein the partition plates for partitioning the left and right gas chambers are communicated with each other through openings formed therein. 4. A liquid chamber and a gas chamber are provided in the front and rear of the dynamic vibration reducer as seen from a side view of an operator cab,
The operator cab vibration absorber for a construction machine according to claim 1, wherein the front and rear gas chambers are communicated with each other by communication pipes. 5. A liquid chamber and a gas chamber are provided at the front and rear of the dynamic vibration reducer in a side view of an operator cab, and the liquid chambers at the front and rear are provided,
2. An operator cab vibration absorber for a construction machine according to claim 1, wherein the partition plates for partitioning the front and rear gas chambers are communicated with each other through holes formed therein. 6. The operator cab vibration of a construction machine according to claim 1, wherein the dynamic vibration reducer is incorporated in at least one of a cab ceiling, a cab floor, and a cab rear face plate forming a cab frame. Absorber.