JPH0617882Y2 - Backhoe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mounts a backhoe device on a swivel base so that the direction can be changed around a vertical axis, and a swing cylinder for this direction change operation is provided. The present invention relates to a backhoe in which an operating lever for a device and a motor for driving the swivel are arranged in front of a driver's seat.

[Conventional technology]

In the above-mentioned backhoe, conventionally, for example, actual development Sho 62-7461
As shown in the publication, a tank for hydraulic oil and engine fuel has been arranged at a position located on a side of a driving step portion of a swivel and a lateral side of a driving seat.

[Problems to be solved by the device]

In the conventional case, the driver's living space is narrow due to the tank, which makes it difficult to operate, and the tank may be difficult to work because of an obstacle in seeing the vicinity of the fuselage from the driver.

An object of the present invention is to improve habitability and visibility.

[Means for Solving the Problems]

The present invention is characterized in that, in the backhoe described above, the swing cylinder and the engine fuel tank are separately located at positions on both sides of the motor of the swivel base, respectively. Is located below the upper surface level of the section, the hydraulic oil tank is located behind the front end of the driving seat of the swivel base, and the control valve for the cylinder for operating the backhoe device is operated. A hydraulic line connecting the cylinder and the control valve is installed on the upper part of the oil tank and is arranged on the side of the motor where the swing cylinder is located, and the operating lever and the control valve are linked by a link circuit. I have to do it. The action and effect are as follows.

[Action]

Since the swinging cylinder and engine fuel tank are installed on the sides of the swivel on both sides of the motor below the upper level of the operation step part, and the upper end of the control valve is installed due to the size of the control valve. Since the hydraulic oil tank and the control valve, which are located at a level higher than the upper surface of the step portion, are located rearward of the front end of the driver's seat, there is a swing cylinder that is smaller than the engine fuel tank. Since the hydraulic pipe is arranged on the other side, the control valve and the operating lever are linked by an electric or hydraulic link circuit which requires less space for installation than mechanical means. While lowering the seat level by setting the top level of the step part to the same or lower level as before,
In addition, it is possible to install both tanks and a device for operating the backhoe device, while eliminating the objects that are highly protruding and present on both sides of the driver's seat and on both sides of the swivel front of the driver's seat.

[Effect of device]

Due to the above-described arrangement, the space near the driver's seat can be formed as wide as possible both at the foot level and at the seat level, so that the operation lever can be easily operated and the line-of-sight of the vicinity of the machine can be easily performed to facilitate the work.

〔Example〕

 Next, examples will be shown.

As shown in FIG. 4, the swivel base (2) is attached to the crawler type traveling machine base having the dozer (1), and the swivel base (2) is provided with the driving part (3) and the driver's seat (4). , Swing bracket
A backhoe device (6) is attached so that the direction can be changed around the vertical axis (X) via (5) to form a backhoe with a dozer.

Dozer (1), traveling device, swivel base (2) and backhoe device
In order to enable the operation of (6), it is constructed as shown in FIGS.

That is, the first to third hydraulic pumps (P ₁ ), (P ₂ ), (P ₃ ) are provided in the driving part (3) and driven by the engine (6) so that the intake oil passages (7a) or (7b) are driven. Or (7c) and the tank filter (8a) or (8b) or (8c) through the hydraulic oil tank (T
It is configured to inhale oil from ₁ ). A pair of traveling motor _{(M 1), (M 2} ) one (M ₁₎ of the control valve (V _1),
A swing cylinder that changes the orientation of the backhoe device (6) by swinging the swing bracket (5).
The control valve (V ₂₎ of the (C _1), Dozashirinsa (C ₂₎ first hydraulic pump (P is attached to the top of the control forms a valve (V ₃₎ to array type valve operating oil tank (T _{1) 1} ) so that oil is supplied from the tank filter (10a)
The oil is directly returned to the hydraulic oil tank (T ₁ ) via the tank to discharge the oil. The other traveling motor control valve (V ₄₎ of the (M _2), and, on top of the arm cylinder (C ₃₎ of the control valve (V ₅₎ formed on the array type valve to the hydraulic tank (T ₁₎ Installed and supplied with oil from the second hydraulic pump (P ₂ ), and configured to discharge oil directly by returning to the hydraulic oil tank (T ₁ ) via the in-tank filter (10 b). is there. Boom cylinder (C ₄ ) control valve (V ₆ ) and bucket cylinder (C ₅ ) control valve (V
₇ ) and the control valve (V ₈ ) of the swing motor (M ₃ ) that drives the swivel base (2) is formed as a multiple valve
Installed on top of (T ₁ ), oil is supplied from the 3rd hydraulic pump (P ₃ ), and the oil is returned directly to the hydraulic oil tank (T) through the in-tank filter (10 c). It is configured as follows.

The control valves (V ₁ ) to (V ₈ ) are electromagnetic proportional valves, and the control valves (V ₁ ), (V ₂ ) and
(V ₄ ) to (V ₈ ) and the first to fourth operation levers (12) to (15) arranged in front of the driver's seat (4) and attached to the operation lever attachment box (11) In the combined state, they are linked by the electric circuit (16), and the first operation lever (1
The control valve (V ₁ ) is operated by the forward and backward swing operation of 2), the control valve (V ₄ ) is operated by the forward and backward swing operation of the second operation lever (13), and the cross of the third operation lever (14) is operated. Control valve (V ₅ ) and (V ₈ ) or (V ₅ )
And (V ₂ ) are operated, and the control valves (V ₆ ) and (V ₇ ) are operated by the cross movement of the fourth operation lever (15).

The swivel motor (M ₃ ) is located in front of the driver's seat (4) of the swivel base (2) and between the swivel main frames (18) with the swing bracket mounting bosses (17) connected in series. It is attached to the place where

The control valve (V ₁ ) or (V ₁ ) whose upper end is located at a level higher than the top level of the operation step (2a) of the swivel (2)
_The hydraulic oil tank (T ₁ ) is located at the position behind the front end of the driver's seat on the swivel base (2) so that ( ₈ ) is located behind the front end of the driver's seat (4) and is free from any obstacles at the feet. I am doing it.

Make sure that the swing cylinder (C ₁ ) and the engine fuel tank (T ₂ ) do not protrude from the top of the operation step section (2a).
The positions are located on both sides of the turning motor (M ₃ ) in (2), and are separately arranged below the upper surface level of the operation step part (2a).

Boom cylinder (C ₄ ), arm cylinder (C ₃ ), bucket cylinder (C ₅ ) and control valve (V ₆ ) or (V
₅ ) or (V ₇ ) to the hydraulic line (19)
It is arranged on the side of (M ₃ ) where the swing cylinder (C ₁ ) is located, below the upper surface level of the operation step portion (2a).

[Another embodiment]

The control valve may be configured to be operated by pilot oil pressure, and the control valve and a predetermined operation lever may be linked by a pilot oil pressure circuit. Therefore, this pilot hydraulic circuit and the electric circuit (16) are simply linked together (1
6).

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 shows an embodiment of a backhoe according to the present invention. FIG. 1 is a partially cutaway plan view of a swivel base, FIG. 2 is a partially cutaway side view of the swivel base, and FIG. Front view of the fourth
The figure is a side view of the entire backhoe. (2) …… swivel base, (4) …… driver seat, (6) …… backhoe device, (14), (15) …… control lever, (16) …… link circuit,
(19) …… hydraulic line, (C ₁ ) …… swing cylinder, (C ₃ ),
(C ₄ ), (C ₅ ) …… Cylinder, (V ₅ ), (V ₆ ), (V ₇ ) …… Control valve, (M ₃ ) …… Motor, (T ₁ ) …… Hydraulic oil tank,
(T ₂ ) …… Engine fuel tank.

Claims (1)

[Scope of utility model registration request] 1. A backhoe device (6) is attached to a swivel base (2) so as to be able to change its direction around a vertical axis, and a swing cylinder (C ₁ ) for this direction changing operation is provided, and the backhoe device (6) is provided. ) For operating levers (14), (15), and a motor (M ₃ ) for driving the swivel base (2) arranged in front of the driver's seat (4), the swing cylinder ( C ₁ ) and the engine fuel tank (T ₂ ) separately on the swivel base (2) at positions located on both sides of the motor (M ₃ ) respectively.
A location where the hydraulic oil tank (T ₁ ) is located below the upper level of the driving step portion (2a) of (2), and the hydraulic oil tank (T ₁ ) is located behind the front end of the driving seat (4) of the swivel base (2). Cylinder (C ₃ ), (C ₄ ), which is arranged in, and operates the backhoe device (6),
The control valve (V ₅ ), (V ₆ ), (V ₇ ) for (C ₅ ) is attached to the upper part of the hydraulic oil tank (T ₁ ), the cylinder (C ₃ ),
The hydraulic pipe (19) connecting (C ₄ ), (C ₅ ) and the control valves (V ₅ ), (V ₆ ), (V ₇ ) is connected to the swing side of the motor (M ₃ ). It is arranged on the side where the cylinder (C ₁ ) is located, and the operating levers (14), (15) and the control valve (V ₅ ),
A backhoe in which (V ₆ ) and (V ₇ ) are linked by a link circuit (16).