JPH03255241A - Vibration proofing support mechanism of hydraulic control valve stand - Google Patents

Abstract

PURPOSE:To prevent vibration from transmitting to a cabin and seats by supporting, with vibration proofing, a control valve stand on which a control valve and an operation lever supporting board are installed, on a working vehicle body frame. CONSTITUTION:Four vibration proofing rubbers 10a and 10b are installed on a body frame 7, and a control valve board 12 is supported on them with vibration proofing. A control valve V is placed on the control valve board 12 and a link mechanism is installed to be operated by a working device operation lever 9 which is pivotally installed on an operation lever supporting board 1, and a driving transmission lever 8 on the spool of the control valve V. A floor extension board 11 is fixed and supported on the control valve stand 12 through supporting brackets on the right and left, and an operation lever supporting board 1 is vertically installed on the floor extension board 11. It is thus possible to prevent vibration generated by pulsation of pressure oil which is supplied to the control valve V from transmitting to the cabin and seats.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention is a work vehicle such as a backhoe, in which a part of the operating lever is vibration-proofed, and the control valve is configured to prevent abnormal operation in the vibration-damped state. This is what I did.

(b) Prior art Conventionally, there is a technology for providing vibration-proof support between the fuselage frame and the cabin in construction machinery.
A technique such as that disclosed in Publication No. 74 is known to the public.

However, in the above-mentioned conventional technology, although anti-vibration rubber is interposed between the fuselage frame, the cabin, and the control lever, the control valve operated by the control lever is fixedly supported on the fuselage frame side. When the relative position of the cabin and control lever side relative to the aircraft frame side changes due to the deflection of the anti-vibration rubber due to vibration, the spool inside the control valve moves slightly in response, causing the control valve to close. There was a problem in which the work equipment would start operating even though the operator did not operate it.

(c) Problems to be Solved by the Invention The present invention has a large number of movable working parts, such as construction machinery, and is equipped with a plurality of control valves that control the pressure oil of hydraulic cylinders that operate these movable working parts. In a work vehicle that has been operated, if the control lever is fixed to the side of the machine and the control valve mechanism is fixed to a support stand that is supported from the machine body in a vibration-proof manner, the control valve V will vibrate due to the pulsation of the pressure oil, so it will be difficult to operate it. This prevents the problem of the lever and the control valve starting to move in a slightly different relative relationship, moving the spool, and causing the movable working part to rotate.

In order to solve this problem, the present invention supports the operating lever support base that supports the operation lever on the machine frame via vibration isolating rubber, and also supports the control valve base with the vibration isolating rubber. When the control valve (2) moves due to the pulsation of the oil, the control lever is configured to vibrate following the control valve (2), thereby eliminating subtle deviations in the relative positional relationship between the two.

In addition, when the operating lever support is supported by anti-vibration rubber in this way, a part is required to absorb the relative positional relationship between the aircraft frame and the operating lever support, and if a gap is left in this part, the Rainwater, soil, and sand can enter from these parts.

In order to solve this problem, the present invention provides a sealing member made of a flexible material between the floor on the side of the fuselage frame and the floor extension plate on the side of the operating lever support base. It is.

(d) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be explained.

This is a control device for a work vehicle, in which a control valve V and an operation lever support stand 1 are mounted on a control valve stand 12, and the control valve stand 12 is supported on a body frame 7 of the work vehicle in a vibration-proof manner.

Further, a sealing member made of a flexible material is interposed between the floor 6 fixed to the body frame side and the floor extension plate 11 fixed to the lower part of the operating lever support 1.

(E) Embodiment The problems to be solved by the present invention and the means for solving them are as described above.Next, the structure of the embodiment shown in the attached drawings will be explained.

The overall configuration of the backhoe will be explained with reference to FIGS. 1 and 2.

It travels by a crawler type traveling device C, and a rotating frame B is supported on the crawler type traveling device ZCO via a swivel base bearing.

The rotating frame B is configured in a cup shape with arc-shaped side plates 3 and a body frame 7 forming a bottom plate.

An engine room 17 is placed on the rotating frame B, and an engine is placed inside the engine room 17.

Further, a seat 21 is placed in the front part of the engine compartment 17, and an operating lever support base 1, which is a main part of the present invention, is erected in front of the seat 21.

Working machine operating levers 9, 9 and a traveling speed change lever 8 are supported in a protruding manner from the operating lever support base 1.

On the main poom pivot parts 2 and 2 installed on the rotating frame B,
A main boom 22 is pivotally supported so as to be rotatable back and forth and up and down, and an off-cent arm 24 that is pivotable offset left and right is pivotally supported at the tip of the main boom 22.

Also, a bucket arm 23 is attached to the front end of the offset arm 24.
A bucket 25 is attached to the tip of the bucket arm 23.
is centrally supported.

Next, in FIG. 3, the rotating frame B and the engine compartment 17 are shown.
This part will be explained.

The rotating frame B is configured in a cup shape by a fuselage frame 7 forming a bottom plate and an arcuate side plate 3 erected around the frame, and an engine compartment 17 is provided in a semicircular arc portion at the rear of the arcuate side plate 3. It is fixed in place.

The engine compartment 17 covers the engine mounted on the fuselage frame 7 in a vibration-proof manner. The vibration of the engine is absorbed by the vibration isolating rubber interposed between the engine and the fuselage frame 7, so that it is not transmitted to the fuselage frame 7.

A repair inspection hole 18 is opened in the engine compartment 17, and a seat mounting cover 19 can be fitted and fixed into the repair inspection hole 18. A seat slide rail 20 is attached to the seat mounting cover 19.
is fixed, and a seat 21 is supported on the seat slide rail 20 so as to be adjustable back and forth.

Further, a floor 6 is placed and fixed on the arcuate side plate 3 at the left front position of the engine compartment 17, so that the feet of the operator sitting on the seat 21 are placed on the floor 6. ing.

The operation lever support base 1, floor extension plate 11, and control valve base 12, which are the main parts of the present invention, are placed in front of the floor 6 from above with anti-vibration rubber l0a-10b.
It is arranged with a . The vibration isolating rubber 10a.1
0b prevents the vibrations generated by the pulsation of the pressure oil supplied to the control valve V from being transmitted to the cabin, seats, etc. via the fuselage frame 7.

2 is the main boom rejection branch.

Next, referring to FIG. 4, a support mechanism for the operating lever support stand 1, the floor extension plate 11, and the control valve stand 12 will be explained.

The part surrounded by a frame in FIG. , so that it is not transmitted to the cabin or seats.

The rotating frame B is composed of a circumferential arc-shaped side plate 3 and a body frame 7 at the bottom. The control valve metalwork 2 is supported and fixed in a vibration-proof manner.

A control valve (2) is placed on the control valve stand 12. A link mechanism is interposed in the spool of the control valve V so that it can be operated by the working machine operating levers 9 and the traveling speed change lever 8 which are pivotally supported on the operating lever support base 1.

In addition, the fuselage frame 7 is
A floor extension plate II is attached via left and right support brackets 14 on the control valve stand 12, which is supported in a vibration-proof manner.
is fixedly supported, and an operation lever support stand 1 is erected on the floor extension plate 11.

The floor extension plate 11 is provided at the upper end of the arcuate side plate 3, which is the same position where the floor 6 is placed.

The floor extension plate 11 has vibration-proof rubber 10a and 10 at the bottom.
Since it is fixed to the part supported by b, the relative positional relationship between the floor 6 placed on the side of the rotating frame B shifts due to vibration, so the floor extension plate 11 and the floor 6 The dust cover 5 made of a flexible elastic material is placed between the two.
The overlapping portion of the elastic seal plate 4 and the floor extension plate 1
1 is airtightly supported.

Further, a gap is also formed between the tip of the floor extension plate 11 and the upper end of the arcuate side plate 3.

Next, referring to FIG. 5, the connecting portion between the swing frame B and the control valve stand 12 will be explained.

An inspection lower a is provided in a part of the fuselage frame 7 constituting the swing frame B, and a control valve stand 12 with anti-vibration rubber 10a and 10b interposed thereon is mounted to close the inspection lower a. has been done.

The left and right support brackets 14 are projected upward from the control valve stand 12, the floor extension plate 11 is placed on the upper ends of the left and right support brackets 14, and the operating lever support stand 1 is placed on the floor extension plate 11. Fixed.

Next, referring to FIGS. 6 to 9, a sealing mechanism between the floor 6 and the floor extension plate 11 will be described.

As shown in FIG. 6, FIG. 8, and FIG. 9, the sealing mechanism made of a flexible elastic material includes an elastic sealing plate 4 on the upper surface and a dust plate fixed to the floor extension plate 11 below the elastic sealing plate 4. It is composed of a cover 5.

The elastic seal plate 4 is fixed to the upper surface of the dust cover 5 with an adhesive or the like, and the end portion 6a of the floor 6 is overlapped thereon.

However, it is necessary to allow vertical vibration between the floor extension plate 11 and the floor 6, and a gap is created between the end 11a of the floor extension board 11 and the end 6a of the floor 6. It is composed of relationships.

However, since the dust cover 5 and the floor 6 overlap and the elastic seal plate 4 is interposed between them, rainwater and earth and sand cannot cross the sealing mechanism from below or above. It is.

Further, the floor 6 is fixed to the rotating frame B, and the floor extension plate 11 is supported by the operating lever support base 1 in a vibration-proof manner, but between the end portion 6a and the end portion 11a,
The floor extension plate 11 can absorb this vibration.

Moreover, the dust cover 5 can also close the gap between the floor 6 and the floor extension plate 110.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

As claimed in claim (1), the control device for a working vehicle is such that the control valve (1) and the operating lever support stand 1 are mounted on the control valve stand 12, and the control valve stand 12 is mounted on the body frame 7 of the work vehicle. Since the anti-vibration support is provided, the vibration-isolating rubber 10a prevents the vibrations generated by the pulsation of the pressure oil supplied to the control valve ■.
・Since vibration is prevented by IOb, the vibration is
It is possible to prevent it from being transmitted to the cabin and seats via the .

In addition, the control valve stand 12 which is the vibrating part
Since the control valve ■ is also supported on the same base, it can be used even if shocks or large vibrations caused by sudden braking occur on the work equipment operating levers 9, 9, travel gear shift lever 8, or their interlocking links. The control valve ■ also vibrates in the same way.

Therefore, by supporting both separately, on the vibration side and the anti-vibration side, the spool of the control valve V will slightly vibrate based on the vibration of the machine, causing unexpected movement of the work equipment and traveling equipment. The fear was gone.

According to claim (2), a sealing member made of a flexible material is interposed between the floor 6 fixed to the aircraft frame side and the floor extension plate 11 fixed to the lower part of the operating lever support 1. Since the operation lever support base 1 and the floor extension plate 11 are vibration-proofed, it is necessary to provide a gap between the floor 6 fixed to the rotating frame B side to absorb vibrations. Since the gap was closed in a vibration-absorbing state by a sealing mechanism made of a flexible material, mud could be prevented from being splashed up by earth and sand from below.

[Brief explanation of drawings]

Figure 1 is an overall side view of the backhoe of the work vehicle, Figure 2 is a plan view, Figure 3 is a perspective view of the swing frame F, engine compartment 17, floor 6, and seat 21 disassembled, and Figure 4 is an exploded perspective view of the backhoe. The figure is a side sectional view showing the anti-vibration support structure of the operating lever support stand 1 and the control valve stand 12, FIG. 5 is a perspective view of the part shown in FIG. 4, and FIG. FIG. 7 is a plan view as well, and FIGS. 8 and 9 are a side view and a plan view of the seal mechanism made of flexible material. B... Swivel frame... Operation lever support 3... Arc-shaped side plate 4... Elastic seal plate 5... Dust cover 6... Floor 7... Airframe frame 8... Traveling speed change Lever 9... Work equipment operating lever 10... Vibration isolating rubber 11... Floor extension plate 12... Control valve stand

Claims (2)

[Claims] (1) A control device for a work vehicle, characterized in that a control valve and a control lever support are mounted on a control valve stand, and the control valve stand is supported in a vibration-proof manner on the body frame of the work vehicle. Anti-vibration support mechanism for hydraulic control valve stand. (2) In claim (1), a sealing member made of a flexible material is interposed between the floor fixed to the aircraft frame side and the floor extension plate fixed to the lower part of the operating lever support. A vibration-proof support mechanism for a hydraulic control valve stand, which is characterized by: