JPH10212738A - Vibration control device for cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the setting up and varying of damping and vibration damping performance by mutually communicating fluid enclosed in a plurality of enclosed fluid vibration isolating members inserted between a cab and a frame through a communicating pipe line, and throttling the flow of fluid due to vibration in the pipe line through control means. SOLUTION: A vibration damping device 18 for a cab 8 is provided between the cab 8 and a frame. The vibration damping device 18 is equipped with four enclosed fluid vibration isolating members 20; a communicating pipe line 30 to mutually communicate the fluid in an enclosed fluid vibration isolating member 20; and fluid control means 40 for controlling the flow of fluid passing the pipe line 30. Concerning the response of the vibration isolating member 20 to the vibration of the cab 8, the flow of fluid is caused in the pipe line 30 even in the case of the backward, rightward and upward vibrations and controlled by the variable throttle valves 42a, 42b of the fluid control means 40. Thus desired damping vibration damping performance can be easily set up and vary, and moreover the vibration damping device for the cab which is simple in structure and excellent in durability can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vibration damping device for a cab mounted on a body frame of a construction vehicle or the like, and more particularly to a vibration damping device interposed between a cab and a frame.

[0002]

2. Description of the Related Art A cab containing a driver's seat mounted on a construction vehicle or the like is provided with a vibration-proof member such as a vibration-proof rubber from the viewpoints of ensuring the safety of a driver, isolating from noise and vibration, and the like. Mounted on the aircraft frame.

[0003] Referring to Figs. 8 and 9, a description will be given of a hydraulic shovel as a typical construction vehicle.
The hydraulic excavator shown by the numeral includes a lower traveling body 4 and an upper revolving body 6 rotatably mounted on the lower traveling body 4, and a cab 8 accommodating a driver's seat is arranged on the upper revolving body 6. Has been established. The hydraulic excavator 2 is subjected to construction work by a working device (not shown) installed on the upper revolving unit 6, and also by the traveling of the hydraulic excavator 2 itself by the lower traveling unit 4, the vibration of the hydraulic excavator 2 itself is considerable. Is generated. Then, in the cab 8, for example, a horizontal vibration in the left-right direction as shown by a two-dot chain line in FIG. 8 and a vertical vibration in the front-rear direction as shown in a two-dot chain line in FIG. Therefore, in order to reduce these vibrations, the cab 8 is mounted on the frame 6 of the upper swing body 6 on which the cab 8 is mounted.
a is mounted via a plurality of vibration isolating members 10. As the anti-vibration member 10, anti-vibration rubber is generally used. However, the anti-vibration rubber has a natural frequency that is sensitive to a human body that resonates with the cab 8 at a low frequency, and also has an insufficient vibration damping effect. Therefore, in recent years, a fluid-filled vibration-proofing member 50 in which a fluid is filled has been used as an improved vibration-proofing member 10 that imparts a damping property to the cab 8.

Referring to FIG. 7, the fluid-filled vibration damping member will be described. The fluid-filled vibration damping member, generally designated by reference numeral 50, seals a container 52 having an open end and an open end of the container 52. An elastic member 54, the elastic member 54 and the container 5
2 is filled with a fluid 57 having high viscosity. A shaft member 54a that penetrates the elastic member 54 from the outside and protrudes into the space 56 is fixed to the elastic member 54, and a plate-shaped internal plate 54b is provided at the tip protruding into the filling space 56, and the internal plate 5
The periphery of 4b is formed with a predetermined gap 52b with the inside of the hollow container 52, and the inner plate 54b is provided with an orifice 54c penetrating in the thickness direction of the inner plate 54b. Thus, when the shaft member 54a fixed to the elastic member 54 vibrates in the axial direction, the fluid 57 in the space 56 of the container 52 is discharged from the orifice 5 of the inner plate 54b.
4c and the gap 52b with the container 52. And
The vibration of the shaft member 54a is attenuated by the resistance force of the passing fluid (viscous attenuation). The container 52 is provided with a mounting bracket 52a. By attaching the mounting bracket 52a to one of the cab 8 and the frame 6a and the shaft member 54a to the other of the cab 8 and the frame 6a, the vibration of the cab 8 attached to the frame 6a is attenuated and damped.

[0005]

The above-mentioned fluid-filled vibration damping member 50 greatly attenuates the vibration as compared with the conventional vibration damping rubber, but (1) the damping resistance is large because the viscosity of the fluid 57 is large. In order to obtain the desired damping and damping performance for a variety of cabs such as large and small, light and heavy,
It is necessary to set the size of 4c, the size of the gap 52b, and the size of the viscosity of the fluid 57 (that is, the type of the sealed fluid). These parameters are set based on the actual measurement of the actual machine or the entity. It requires empirical methods and requires a lot of time and money. Further, in the actual machine, it is mechanically difficult to arbitrarily change the set damping damping performance, and it has been virtually impossible. (2) A damping force is constantly applied to the inner plate 54b, and a stress is generated corresponding to the damping force. Further, when an excessive vibration having a large vibration amplitude occurs, the inner plate 54b and the container 52
May collide with each other, deforming and damaging the inner plate 54b, and there is a problem in durability of the vibration isolating member 50.

The present invention has been made in view of the above-mentioned facts, and the technical problems thereof are as follows: (1) A desired damping / damping performance can be easily set and changed; (2) The structure is simple. And durable cab damping device.

[0007]

According to the present invention, in order to solve the above technical problems, a cab damping device is configured as follows. (1) The fluid sealed in a plurality of fluid-filled vibration isolating members interposed between the cab and the frame is communicated with each other by a communication pipe. Then, the flow of the fluid generated in the pipeline by the vibration is restricted by the control means, and the vibration is damped and damped. (2) The internal plate provided on the conventional fluid-filled vibration damping member is deleted.

That is, according to the present invention, as a cab vibration damping device for solving the above technical problem, a plurality of fluid-filled vibration damping members interposed between the cab and the frame, A vibration damping device for a cab, comprising: a communication pipe for allowing fluid filled in a member to communicate with each other; and fluid control means for controlling a flow of the fluid through the pipe. .

The fluid-filled vibration damping member includes a container having an open end, and an elastic member for sealing the open end, and a space filled with the fluid is formed by the container and the elastic member. The space is contracted or expanded by elastic deformation of the elastic member, a connection hole is formed in the container to connect the filling space and the communication conduit, and the container is provided in one of the cab and the frame. Preferably, the elastic member is connected to the other of the cab and the frame. The vibration isolating member is interposed between the bottom surface of the cab and the frame. Preferably, the anti-vibration members are disposed at four places on the front, rear, left and right of the bottom surface of the cab, and the anti-vibration members adjacent to the front, rear, left and right sides of the cab act on the respective anti-vibration members. When the directions of the vibration displacement with respect to the frame are the same, one of the vibration isolating members and the other of the vibration isolating members have the contracted state and the expanded state opposite to each other, and the direction of the vibration displacement is In the opposite case, the one vibration isolating member and the other vibration isolating member are arranged so as to be in the contracted state or the expanded state, and the communication conduit is provided in the front-back or left-right direction. The fluid of the vibration isolating members adjacent to each other is communicated with each other. Further, the fluid control means includes a throttle valve disposed in the communication conduit. The throttle valve is preferably an electromagnetic variable throttle valve.

[0010] In the vibration damping device for a cab according to the present invention, (1) the fluid sealed in the plurality of fluid-filled vibration damping members is communicated with each other by a communication pipe, and the vibration of the cab causes the communication pipe to communicate with the communication pipe. When the flow of the fluid is generated, the flow is throttle-controlled by the throttle valve of the control means, and the vibration is damped and damped. (2) Since the control means for damping damping is provided separately from the vibration isolating member, the internal plate, which is a member which is likely to be damaged and is provided in the conventional vibration isolating member, is eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a cab vibration damping device constructed according to the present invention will be described below in more detail with reference to the accompanying drawings.

Referring to FIG. 1, an embodiment of a cab damping device according to the present invention in a hydraulic shovel, which is a typical construction vehicle, will be described. A hydraulic excavator generally designated by reference numeral 2 includes a lower traveling body 4 and an upper revolving body 6 rotatably mounted on the lower traveling body 4, and a cab 8 in which a driver's seat is accommodated is provided with an upper revolving body. 6.

A cab damping device 18 is provided between the cab 8 and the frame 6a of the upper swing body 6 on which the cab 8 is mounted. A working device 12 is installed on the upper swing body 6, and the working device 12 includes a boom 12a supported by the upper swing body 6 so as to be vertically swingable, the upper swing body 6 and the boom 1.
2a, an arm 12c supported at the tip of the boom 12a so as to be vertically swingable, an arm operating cylinder 12d, an arm 12c interposed between the boom 12a and the arm 12c. And a bucket cylinder 12f interposed between the arm 12c and the bucket 12e.

Referring to FIG. 2, the structure of the cab damping device 18 will be described.
Four fluid-filled vibration isolating members 20 interposed between the bottom surface of the cab 8 and the frame on which the cab 8 is mounted, a communication conduit 30 for allowing the fluid of the vibration isolating member 20 to communicate with each other, and passing through the conduit 30. Fluid control means 40 for controlling the flow of the fluid. Since the vibration isolating member 20, the communication conduit 30, and the fluid control means 40 are used in combination of a plurality of substantially the same members, the individual members are distinguished as follows for the sake of explanation. The four fluid-filled vibration isolating members 20 are arranged at four positions on the front, rear, left and right sides of the cab 8 with different mounting methods. The right front anti-vibration member 20 is 20a, the left front is 20b, and the right rear is 20a.
c, left rear is distinguished from 20d. The communication pipe 30 communicates the fluid filled in the vibration isolating members 20 adjacent to each other in the front-back or left-right direction. These communication conduits 30 are
a, 30b, 30c, and 30d, the vibration isolating members 20a and 20b are communicated by the conduit 30a, and the conduit 30b
The vibration isolating members 20c and 20d are communicated by the
0c connects the vibration isolating members 20b and 20d, and the pipe 30d connects the vibration isolating members 20a and 20c. The fluid control means 40 includes a variable throttle valve 42a provided in the communication pipe 30a, a variable throttle valve 42b provided in the communication pipe 30b, a variable throttle valve 42c provided in the communication pipe 30c, and a communication pipe. Variable throttle valve 42 arranged in path 30d
d.

Referring to FIG. 3, the structure of the fluid-filled vibration damping member 20 will be described. The vibration damping member 20 includes a container 22 having one open end, and an elastic member 24 for sealing the open end.
A fluid filling space 26 formed by the container 22 and the elastic member 24 is filled with a fluid 27 such as high-viscosity hydraulic oil. The elastic member 24 is formed of an elastic body such as oil-resistant synthetic rubber. The container 22 has a filling space 26.
A connection hole 22b that communicates with the communication conduit 30 is formed. A shaft member 24a that protrudes outward in a direction opposite to the filling space 26 is fixed to the elastic member 24. Further, the container 22 is provided with a mounting bracket 22a.
Thus, when the shaft member 24a is displaced in the direction indicated by the arrow 24b with respect to the mounting bracket 22a, the elastic member 24 is elastically deformed and the filling space 26 is contracted, and the shaft member 24a is moved by the arrow 24c. When displaced in the opposite direction shown, the filling space 26 is expanded.

Referring to FIGS. 4 (a) and 4 (b), a method of mounting the fluid-filled vibration isolating member 20 disposed between the bottom surface 8a of the cab 8 and the frame 6a will be described. First, as shown in FIG. 4 (a), the right and left anti-vibration members 20a and 20c
The mount support 6b for mounting the anti-vibration members 20a and 20c to the frame 6a protrudes horizontally from the frame 6a and is provided at the front and rear. The mount support 6b is formed in a thick plate shape, and has a through hole 6c in the plate thickness direction (see FIG. 3) through which the shaft member 24a of the vibration isolating member 20 can pass with a gap. The anti-vibration member 20a has a shaft member 24a on the front mount support 6b.
Is mounted downward on the upper surface of the mount support 6b by mounting means (not shown) such as bolts and nuts via a mounting bracket 22a. Shaft member 2
The tip of 4a is connected to a mount support 8b projecting downward from the bottom surface 8a of the cab 8. The anti-vibration member 20c has a shaft member 24a on the rear mount support 6b.
Is mounted on the lower surface of the mount support 6b by a mounting means (not shown) such as a bolt or a nut via a mounting bracket 22a. Shaft member 2
The tip of 4 a is connected to the bottom surface 8 a of the cab 8.

As shown in FIG. 4B, the left and right anti-vibration members 2
Explaining about 0b and 20d, the mount support 6b projects horizontally from the frame 6a and is provided at the front and rear like the right side of the frame 6a. The anti-vibration member 20b is attached to the front mount support 6b by mounting means (not shown) such as bolts and nuts on the lower surface of the mount support 6b with the shaft member 24a facing upward through the mounting bracket 22a. I have. Shaft member 24a
Is connected to the bottom surface 8a of the cab 8. An anti-vibration member 20d is attached to the rear mount support 6b by mounting means (not shown) such as bolts and nuts via a mounting bracket 22a on the upper surface of the mount support 6b with its shaft member 24a facing downward. I have. The tip of the shaft member 24a is connected to a mount support 8b projecting downward from the bottom surface 8a of the cab 8.

Thus, the anti-vibration members 20 (for example, the front right 20a and the rear right 20c, the front left 20b and the rear left 20d, the front right 20a and the front left 20a) are adjacent to each other.
b, the rear right 20c and the rear left 20d) are one of the vibration isolating members (for example, 2 if the directions of vibration displacement of the cab 8 acting on the respective vibration isolating members 20 with respect to the frame 6a are the same).
0a) and the other anti-vibration member (for example, 20c) are in a contracted state and an expanded state that are opposite to each other (for example, when the cab 8 is displaced upward, the anti-vibration member 20a is in a contracted state,
When the directions of vibration displacement are opposite to each other, one of the vibration isolating members (for example, 20a) is used.
And the other vibration isolating member (for example, 20c) are arranged so as to be in a contracted state or an expanded state.

Referring to FIG. 5, the structure of the control means 40 will be described. The fluid control means 40 comprises communication pipes 30a, 30b,
Electromagnetic variable throttle valve 42 provided in each of 30c and 30d
a, 42b, 42c, and 42d. These electromagnetic variable throttle valves 42a, 42b, 42c and 42d are combined with the electromagnetic variable throttle valves 42a and 42b, and together with the electromagnetic variable throttle valves 42c and 42d, respectively, to the amplifier 44 and the variable resistor. It is connected to a DC power supply 48 via 46.

Referring mainly to FIG. 2, the operation of the cab damping device 18 according to the present invention constructed as described above will be described. For example, when the cab 8 is in one direction of the swing amplitude of the pitching vibration, an arrow 32a Displaced forward as indicated by
A frame 6a is provided on the left and right front vibration isolating members 20b and 20a.
Vibration displacement in the same direction acts on both
And among the vibration isolating members 20b and 20a, the vibration isolating member 20b
The filling space 26 is in a contracted state (see FIG. 4B), the filling space 26 of the vibration isolating member 20a is in an expanded state (see FIG. 4A), and the vibration isolating members 20b and 20a are The communicating pipe 30a is connected to the vibration isolating member 20b by the vibration isolating member 20b.
The flow of the fluid indicated by the arrow 32b occurs to a. At this time, the frame 6a is attached to the rear left and right vibration isolating members 20d and 20c.
In this case, the vibration displacement upward in the same direction acts on the vibration damping members 20d and 20c, and the filling space 26 of the vibration damping member 20d is in a compressed state (see FIG. 4B). The filling space 26 of the vibration member 20c is in an expanded state (FIG. 4).
(Refer to (a)), a fluid flow indicated by an arrow 32b is generated from the vibration isolating member 20d to the vibration isolating member 20c in the conduit 30b.
The flow of these fluids indicated by arrows 32b is
0a and the variable throttle valve 42b provided in the conduit 30b are controlled by the variable resistor 46
By operating and controlling (see FIG. 5), the arrow 3
The flow of the fluid indicated by 2b is restricted and restricted, and the forward swing of the cab 8 is controlled. As described above, since the variable throttle valves 42a and 42b work effectively against pitching vibration, they are controlled together by one variable resistor 46 as described above.

When the cab 8 is displaced to the left as indicated by an arrow 34a, which is one direction of the swing amplitude of the roll vibration, of the vibration isolating members 20b and 20d on the left and front sides, the vibration isolating member 20b
The filling space 26 is in a contracted state, and the vibration isolating member 20
The filling space 26 of d is in an expanded state, and a fluid flow indicated by an arrow 34b is generated in the pipe 30c from the vibration isolating member 20b to the vibration isolating member 20d. At this time, the right and left anti-vibration members 2
0a and 20c, the vibration isolating member 20a is
6 is in a compressed state, and the filling space 26 of the vibration isolating member 20c is
Is in an expanded state, and a fluid flow indicated by an arrow 34b is generated in the conduit 30d from the vibration isolating member 20a to the vibration isolating member 20c. The flow 34b of the fluid is controlled by operating the variable resistor 46 (see FIG. 5) by controlling the throttle opening of the variable throttle valve 42c provided in the pipe 30c and the variable throttle valve 42d provided in the pipe 30d. By doing so, the flow of the fluid indicated by the arrow 34b is restricted and restricted, and the sway of the cab 8 to the left is controlled. As described above, since the variable throttle valves 42c and 42d work effectively against the roll vibration, they are controlled together by the single variable resistor 46 as described above.

When the cab 8 is displaced downward as indicated by an arrow 36a, which is one direction of the swing amplitude of the vertical vibration, the cab 8 is provided with the front and left vibration isolating members 20b and 20a and the rear left and right vibration isolating members 20d and 20c. The filling spaces 26 of the vibration members 20b and 20c are in a contracted state, the filling spaces 26 of the vibration isolating members 20a and 20d are in an expanded state,
0b through the pipe 30a and the pipe 30c.
0a and the fluid flow indicated by the arrow 36b to the vibration isolating member 20d, and from the vibration isolating member 20c to the pipe 30b and the pipe 30.
d to the vibration isolating member 20d and the vibration isolating member 20a
Fluid flows indicated by 6b are respectively generated. The flow 36b of the fluid is connected to the conduits 30a, 30b, 30c and 30.
d, variable throttle valves 42a, 42b, 42a, 4
The swinging of the cab 8 downward is controlled by being restricted by the diaphragm 2b.

As described above, the vibration isolating member 20 against the vibration of the cab 8
Of the cab 8, the swing of the cab 8 to the rear, the swing of the cab 8 to the right, the upward swing of the cab 8. As will be understood from the above description, a fluid flow is generated in the conduit 30 and the flow is controlled by the variable throttle valves 42a, 42b, 42a, 42b.

The vibration of the cab in an actual construction vehicle or the like depends on working conditions, running conditions and the like of the vehicle and the like.
Since the upper and lower vibrations are combined or a specific vibration is emphasized in the combination, the variable throttle valve is adjusted according to the form of the vibration to set the throttle opening. At this time, the adjustment setting can be easily performed by operating the variable resistor, and it is not necessary to disassemble the vibration isolating member or replace parts as in the related art. As described above, the cab damping device of the present invention can easily obtain any damping damping. Normally, it is preferable to set the maximum damping and change the degree of damping damping according to the driver's preference. By properly damping and damping the vibration of the cab, effects such as improvement of cab durability and reduction of noise can be obtained. And
Since the fluid-filled vibration isolator does not require a conventional internal plate with an orifice, its structure is significantly simplified.

Although the present invention has been described in detail based on the embodiments, the present invention is not limited to the above-described embodiments, and various changes or modifications can be made within the scope of the present invention. is there. For example, the four variable throttle valves 42a, 42b, 42c, and 42d of the control means 40 described with reference to FIG. 5 in the embodiment can be a centralized electromagnetic variable throttle valve 43 integrated as shown in FIG. . Thereby, the vibration isolating members 20a, 20b, 20c,
20d means one conduit 31a, 31b, 31c, 3
Since the connection can be made at 1d, the control means is simplified.
In the present embodiment, the vibration damping device 18 is provided between the bottom surface 8a of the cab 8 and the frame 6a, but is further provided between the side surface of the cab and the frame erected on the side surface of the cab. Is also possible. Further, the number of the vibration isolating members 20 can be arbitrarily set according to the size, weight, and the like of the cab. The throttle valve of the control means 40 has been described by using an electromagnetic variable throttle valve. However, if the size of the throttle is determined, a throttle with a fixed opening may be used, or a manual variable throttle may be used. It is possible to provide a durable cab vibration damper with lower cost.

[0026]

According to the cab damping device constructed in accordance with the present invention, (1) the desired damping damping performance can be easily set and changed, and (2) the structure is simple and durable. Provided is a cab vibration damping device having a characteristic.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a hydraulic shovel to which a cab vibration damping device configured according to the present invention is applied.

FIG. 2 is a schematic explanatory view showing main components of a cab vibration damping device configured according to the present invention and the operation thereof.

FIG. 3 is a schematic cross-sectional view showing the fluid-filled vibration damping member shown in FIG. 2 together with a part of a communication conduit and a part of a mount support.

FIG. 4A is a schematic cross-sectional view showing a state in which the right and left front and rear fluid-filled vibration isolating members shown in FIG. 2 are attached to a cab and a frame. FIG. 3B is a schematic cross-sectional view showing a state where the left and right front fluid-filled vibration damping members shown in FIG. 2 are attached to the cab and the frame.

FIG. 5 is a diagram illustrating fluid control means of the cab vibration damping device shown in FIG. 2;

FIG. 6 is a diagram illustrating another embodiment of the fluid control means.

FIG. 7 is a schematic sectional view of a conventional fluid-filled vibration damping member.

FIG. 8 is a schematic partial front view of the hydraulic excavator for explaining the roll vibration of the cab.

FIG. 9 is a schematic partial side view of a hydraulic excavator illustrating pitch vibration of the cab.

[Explanation of Signs] 2: Hydraulic excavator 6a: Frame 8: Cab 18: Cab damping device 20 (20a, 20b, 20c, 20d): Fluid-sealed vibration-proofing member 22: Container 24: Elastic member 26: Filling space 30 ( 30a, 30b, 30c, 30d): communication conduit 40: control means 42 (42a, 42b, 42c, 42d): variable throttle valve 50: fluid-filled vibration-proofing member 52: container 54: elastic member 56: filling space

Claims (6)

[Claims] 1. A vibration damping device for a cab provided between a cab and a frame on which the cab is mounted, a plurality of fluid-filled vibration isolating members interposed between the cab and the frame, A vibration damping device for a cab, comprising: a communication pipe for allowing the fluid filled in the vibration isolating member to communicate with each other; and fluid control means for controlling a flow of the fluid through the pipe. 2. The fluid-filled anti-vibration member includes a container having an open end, and an elastic member for sealing the open end, and a space filled with the fluid is formed by the container and the elastic member. And the space is contracted or expanded by the elastic deformation of the elastic member.The container is provided with a connection hole communicating the filling space and the communication conduit, and the connection hole is formed in one of the cab and the frame. The cab vibration damping device according to claim 1, wherein a container is connected, and the elastic member is connected to the other of the cab and the frame. 3. The vibration damping device for a cab according to claim 1, wherein said vibration damping member is interposed between a bottom surface of said cab and said frame. 4. The vibration isolating members are disposed at four locations on the front, rear, left and right sides of the bottom surface of the cab, and the vibration isolating members adjacent to the front, rear, left and right sides of the cab act on the respective vibration isolating members. When the directions of the vibration displacement with respect to the frame are the same, one of the vibration isolating members and the other of the vibration isolating members have the contracted state and the expanded state opposite to each other, and the direction of the vibration displacement. Are opposite to each other, the one vibration isolating member and the other vibration isolating member are both disposed in the contracted state or in the expanded state, and the communication conduit is disposed forward or backward or The vibration damping device for a cab according to claim 3, wherein the fluid is communicated between the vibration damping members adjacent to each other on the left and right sides. 5. The cab vibration damping device according to claim 1, wherein said fluid control means includes a throttle valve provided in said communication conduit. 6. The cab vibration damping device according to claim 5, wherein said throttle valve is an electromagnetic variable throttle valve.