JP2001040702A - Turning construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the switching operation of a pattern switching valve without using a special purpose tool and to efficiently dispose the pattern switching valve near an engine. SOLUTION: A pattern switching valve 49 is disposed while utilizing a large space in an engine room 43, so that even a small hydraulic backhoe can accommodate the pattern switching valve 49. A bonnet 42 for opening/closing the engine room 43 is provided with a hood opening/closing device 44 provided with a lock, so that the improvident switching operation of the pattern switching valve 49 can be prevented by fixing the bonnet 42 in the closed state. The switching operation of the pattern switching valve 49 can thereby be performed by a previously fitted switching lever 49B without preparing a special tool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type construction machine such as a hydraulic excavator or a hydraulic crane, and more particularly to a pattern switching valve for switching an operation pattern of an operation lever and a combination pattern of a plurality of control valves. Related to swiveling construction machinery.

[0002]

2. Description of the Related Art In general, a hydraulic shovel or the like is known as a swing type construction machine. The hydraulic excavator is provided with a lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body via a revolving device, and is provided at a front portion of the upper revolving body so as to be able to move up and down. And a working device for performing excavation work and the like.

[0003] The upper revolving superstructure includes a revolving frame, an engine provided on the revolving frame and located on the rear side of the revolving frame, for driving a hydraulic pump, and a pilot pressure supplied to a hydraulic pilot unit. A plurality of control valves for respectively controlling an actuator of the device and a swing motor of the swing device; an operation lever provided on a floor plate positioned in front of the swing frame and operating the work device and the swing motor; And a plurality of pilot valves actuated by the operating lever to supply pilot pressure to a pilot portion of the control valve.

A hydraulic shovel is provided with a pattern switching valve for switching between an operation pattern of the operation lever and a combination pattern of the control valves between each pilot valve and each control valve operated by the operation lever. There is a known one (for example, Japanese Utility Model Publication No. 22482/1990). Further, among conventional hydraulic excavators, there is known a hydraulic excavator in which a pattern switching valve is housed together with each control valve in a space between a turning frame and a floor plate (Japanese Patent Laid-Open No. 7-189).
298).

In a conventional hydraulic excavator, an operator seated in a driver's seat operates a control lever to supply pilot pressure to each control valve, and the flow of hydraulic oil from a hydraulic pump is controlled by each control valve. , The working device is raised and lowered, and the upper rotating body is swung.

The pattern switching valve is a combination pattern of an operation pattern (operation direction) of an operation lever and each control valve, that is, a pilot pressure is supplied from a pilot valve to any control valve when the operation lever is operated. By changing the above, it is possible to change the operation method of the working device or the like to one that is easy for the operator to operate.

Here, since the pattern switching valve changes the operation method of the hydraulic excavator, the switching operation is performed only when a special special tool is used so that the switching state is not inadvertently changed. Have to be able to.

[0008]

In the above-mentioned conventional hydraulic excavator, the pattern switching valve can be switched only when a special dedicated tool is used. If it is damaged, there is a problem that the switching operation of the pattern switching valve cannot be performed.

[0009] Among the conventional hydraulic shovels, a hydraulic shovel disclosed in Japanese Patent Application Laid-Open No. 7-189298 has a pattern switching valve disposed in a space between a turning frame and a floor plate. However, the pattern switching valve is connected to both the plurality of pilot valves and the control valve, respectively.
A number of pilot hoses are connected around it. For this reason, the pattern switching valve requires a large installation space.

Therefore, when the hydraulic excavator is a small hydraulic excavator called a mini excavator, the space between the revolving frame and the floor plate is small because the upper revolving unit is small, so that the pattern switching valve can be accommodated in this space. There is a problem that it is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to easily perform a switching operation of a pattern switching valve using an engine key or the like without using a special dedicated tool. An object of the present invention is to provide a swiveling construction machine capable of performing such operations.

Another object of the present invention is to provide a swivel in which a pattern switching valve can be efficiently disposed by utilizing a space near an engine, and a pattern switching valve can be disposed even in a small installation space. It is to provide a type construction machine.

[0013]

A revolving construction machine according to the present invention comprises: a lower traveling body; an upper revolving body rotatably mounted on the lower traveling body via a revolving device; It consists of a working device that can be raised and lowered at the front,
The upper revolving superstructure is provided with a revolving frame, an engine provided on the revolving frame at a rear side of the revolving frame to drive a hydraulic pump, and an actuator of the working device by supplying pilot pressure to a hydraulic pilot unit. And a plurality of control valves respectively controlling a swing motor of the swing device; an operation lever provided on a floor plate at a front side of the swing frame to operate the working device and the swing motor; and each of the control valves A plurality of pilot valves actuated by the operation lever to supply a pilot pressure to a pilot portion of the pilot unit; and a plurality of pilot valves provided between the pilot valves and the control valves. A pattern switching valve for switching a combination pattern with the control valve.

Then, in order to solve the above-mentioned problem,
A feature of the configuration adopted by the invention of claim 1 is that an engine room is defined by an engine cover including an engine front cover erected on the front side of the engine and a hood provided to open and close around the engine, The pattern switching valve is arranged at a position where a switching operation can be performed when the hood is opened in the engine room.

[0015] With this configuration, a large space is formed in the engine room for accommodating the engine and the like. Therefore, the pattern switching valve is provided by utilizing the space near the engine in the engine room. can do. When switching the pattern switching valve, the switching can be easily performed by opening the hood. Further, since the pattern switching valve is arranged near the engine, the operating oil flowing through the pattern switching valve can be warmed by the heat of the engine.

According to the second aspect of the present invention, the bonnet is provided with a lock which can be opened and closed by a key operation, and the pattern switching valve can switch the pattern when the lock is unlocked and the bonnet is opened.

With this configuration, when the hood is closed and the lock is locked, it is possible to prevent the pattern switching valve disposed in the engine compartment from being inadvertently switched. Further, when the lock is unlocked and the hood is opened, the operator can easily perform the switching operation of the pattern switching valve without using a dedicated tool.

According to the third aspect of the present invention, the pattern switching valve is located at the front side of the engine and is attached to the engine front cover.

With this configuration, the pattern switching valve can be mounted in the front space of the engine using the existing engine front cover.

According to the fourth aspect of the invention, the engine front cover has a substantially horizontal horizontal plate portion on which the driver's seat is mounted, and the pattern switching valve is mounted on the lower surface of the horizontal plate portion of the engine front cover. It is in.

With this configuration, it is possible to use the horizontal plate portion provided on the front cover of the engine for mounting the driver's seat, and to mount the pattern switching valve on the lower surface side of the horizontal plate portion.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hydraulic shovel will be described as an example of a swing type construction machine according to an embodiment of the present invention and will be described in detail with reference to FIGS. In the present embodiment, “front, rear” and “left, right” are used as meaning directions or positions viewed from an operator sitting in a driver's seat.

Reference numeral 1 denotes a lower traveling body of a hydraulic excavator, and 2 denotes an upper revolving body mounted on the lower traveling body 1 via a revolving device 3 so as to be pivotable. 4 is mounted so as to be rotatable upward and downward. Also,
A working device 5 is provided on the front side of the upper swing body 2 so as to be able to move up and down.

The working device 5 has a lower boom 6 attached to each vertical plate 16B of a revolving frame 16 which will be described later so as to be able to move up and down, and is attached to the tip of the lower boom 6 so as to be able to swing left and right. The upper boom 7, an arm retainer 8 attached to the tip of the upper boom 7 so as to swing left and right, an arm 9 attached to the arm retainer 8 so as to be able to move up and down, and an arm 9. It is roughly constituted by a bucket 10 rotatably attached to the tip.

A link rod 11 is rotatably connected between the distal end of the lower boom 6 and the arm retainer 8, and the link rod 11 forms a parallel link with the lower boom 6, the upper boom 7, and the arm retainer 8. The arm 9 (arm retainer 8) is always kept parallel to the lower boom 6 by the parallel link.

Further, the turning frame 16 and the lower boom 6
, A boom cylinder 12 is provided, an arm cylinder 13 is provided between the arm retainer 8 and the arm 9, and a bucket cylinder 14 is provided between the arm 9 and the bucket 10. An offset cylinder 15 is provided between the lower boom 6 and the upper boom 7.

On the other hand, the upper swing body 2 includes a swing frame 16, a counter weight 17, an engine 18, a hydraulic pump 20, a multiple valve device 21, an operation lever 36, an engine cover 38, a driver seat 46, and a pattern switching valve 49, which will be described later. And the like.

Reference numeral 16 denotes a turning frame.
2, a flat bottom plate 16A, and a left and a right, which are erected upward from the bottom plate 16A and extend forward and rearward, as shown in FIG.
On the right, it is roughly constituted by a pair of vertical plates 16B, 16B.

Reference numeral 17 denotes an arc-shaped counterweight mounted on the rear side of the revolving frame 16. The counterweight 17 is mounted on the engine room 4 together with a bonnet 42 described later.
3 covers the rear side.

Reference numeral 18 denotes an engine which is located in front of the counterweight 17 and is mounted horizontally on the revolving frame 16 and extends leftward and rightward. On the right side of the engine 18, a radiator, an oil cooler and the like are provided. Are provided.

Reference numeral 20 denotes a hydraulic pump mounted on the left side of the engine 18. The hydraulic pump 20 is used for running the lower traveling body 1, rotating the upper rotating body 2, and operating the working device 5 and the like. And a pilot pump for supplying a pilot pressure for operating the multiple valve device 21 described later.

A multiple valve device 21 is located on the left side of the revolving frame 16 and in front of the engine 18. The multiple valve device 21 includes a hydraulic pump 20 and a pilot valve 3 described later.
It is constituted by a plurality of hydraulic pilot-type switching valves connected to 7A or the like. Here, the multiple valve device 21
As shown in FIG. 7, the boom cylinder 12, the arm cylinder 13, the bucket cylinder 14, and a later-described turning motor 28
Discharging cylinders for driving the discharging device 4 and the offset cylinder 1 in addition to the control valves 22, 23, 24 and 25 connected to the
5 and the like are provided with control valves (neither is shown).

The control valves 22 to 25 operate when the pilot pressure is supplied from the pilot valve 37A to the hydraulic pilot portions 22A to 25A, and the boom cylinder 12, the arm cylinder 13, the bucket cylinder 1
4, for controlling the swing motor 28;

Reference numeral 26 denotes a hydraulic oil tank disposed on the right side of the turning frame 16 and disposed in front of the engine 18. Reference numeral 27 denotes a fuel tank disposed in front of the hydraulic oil tank 26.
The hydraulic oil tank 26 is connected to the heat exchanger 19, the hydraulic pump 20, the multiple valve device 21 and the like via a hose and piping.

Reference numeral 28 denotes a turning motor disposed on the center side of the bottom plate 16A of the turning frame 16, and the turning motor 28 constitutes a drive section of the turning device 3. The turning motor 28 is rotated to drive the undercarriage 1
The upper revolving unit 2 performs a revolving operation with respect to.

Reference numerals 29 and 30 denote skirt covers provided around the revolving frame 16, and the skirt covers 29 and 3 are provided.
0 is provided to cover the periphery of the turning frame 16 so as to be continuous with the counter weight 17.

A floor plate 31 covers the front left side of the turning frame 16. The floor plate 31 is located on the front side of an engine front cover 39, which will be described later, and is disposed above the bottom plate 16 A of the turning frame 16. As a result, the floor plate 31 is separated upward from the bottom plate 16A of the revolving frame 16, and the bottom plate 16
A below-floor storage space 3 for storing the multiple valve device 21 and the like
2 is defined.

Reference numeral 33 denotes a lever stand which is provided upright on the front of the floor plate 31. A pair of traveling levers 34, 34, which are disposed adjacent to each other at the upper center of the lever stand 33 and which allow the lower traveling body 1 to travel. And a pair of operation levers 36, 36 described later, which are disposed to be separated in the left and right directions so as to sandwich each of the traveling levers 34, and are disposed on the right side of the lever stand 33, and raise the cylinder of the earth discharging device 4 , And another operating lever 35 that is rotated downward.

Reference numerals 36, 36 denote a pair of operation levers disposed on the upper portion of the lever stand 33 and separated from each other in the left and right directions.
Each of the operation levers 36 operates the work device 5 and the turning motor 28, and can be tilted forward and rearward, and left and right, respectively.

Reference numerals 37, 37 denote left and right pilot valve devices (shown in FIG. 7) built in the upper part of the lever stand 33.
6 pilot valves 37A, 37
A, ... are provided. And the pilot valve device 37
The control valves 22 to 25 of the multiple valve device 21 are operated by operating each pilot valve 37A by the operation lever 36.
The pilot pressure is supplied to the hydraulic pilot sections 22A to 25A.

Reference numeral 38 denotes an engine cover which is located on the turning frame 16 and is disposed from the right side to the rear side of the turning frame 16.
An engine front cover 39 erected on the turning frame 16 so as to cover the front side from the upper side, and a hydraulic oil tank 26, a fuel tank 27, a part of the heat exchanger 19, and the like located on the right side of the turning frame 16. It is roughly constituted by a right cover 40 to cover, a left cover 41 located on the left side to cover the hydraulic pump 20 and the like, and a hood 42 located above the counterweight 17 and covering the rear side of the engine 18.

As shown in FIGS. 2 to 5, the engine front cover 39 has a stepped pedestal portion extending substantially from the center to the left and a flat horizontal rectangular plate portion 39A1 having a substantially horizontal upper surface. 39A, a frame-shaped portion 39B protruding upward so as to surround the rear side from the right side of the pedestal portion 39A, and a mounting seat extending downward from the left end side of the pedestal portion 39A and provided on the revolving frame 16. A left leg 39C bolted to 16C and a right leg 39D (see FIG. 5) disposed on the right end of the frame 39B and supporting the frame 39B. Also,
On the horizontal plate 39A1 of the pedestal 39A, a driver's seat 46 described below is placed on the upper side, and a pattern switching valve 49 described below is mounted on the lower side.
Are arranged.

The upper end of the hood 42 is attached to the frame 39B of the engine front cover 39 via a hinge (not shown) so as to be openable and closable. The hood 42 surrounds the engine 18 and defines an engine room 43 that houses the engine 18, the heat exchanger 19, and the hydraulic pump 20 between the engine 18 and the engine front cover 39.

Reference numeral 44 denotes a hood opening / closing device provided below the central portion of the hood 42. The hood opening / closing device 44 includes a handle 44A located outside the hood 42 and operated by pulling, and a hood opening / closing device 44 inside the hood 42. And a hook 44B which rotates when the handle 44A is pulled.
An engine key (not shown) is inserted into the bonnet opening / closing device 44 and locked, so that the handle 4
A lock 44C (shown in FIG. 6) for restricting the operation of 4A and fixing the hood 42 in a closed state is provided.

On the other hand, reference numeral 45 denotes a stopper (shown in FIG. 5) mounted on the upper part of the counterweight 17.
Is a part of the hood opening and closing device 44,
The bar is formed by bending a rod-shaped body into a U-shape, and is bolted to a counter weight 17. The stopper 45 is provided when the hood 42 is closed.
The hood 42 is fixed by engaging the hooks 44B of No. 4 with each other.

Reference numeral 46 denotes a driver's seat disposed on the front cover 39 of the engine. As shown in FIG. 3, the driver's seat 46 is located on the horizontal plate 39A1 of the pedestal 39A.
It is provided via a slide mechanism 47 that moves backward. The operator's seat 46 is for the operator who operates the hydraulic shovel to sit on.

Reference numeral 48 denotes a switching valve mounting bracket mounted on the front cover 39 of the engine.
By bending a rectangular flat plate into a substantially U-shape, a groove-shaped frame plate portion 48 opening upward and extending forward and backward is formed.
A and a substantially square mounting plate 48B integrally fixed to the frame plate 48A so as to close the rear end of the frame plate 48A.

The switching valve mounting bracket 48 has an engine front cover 39 in which both ends on the upper side of the frame plate portion 48A are on the upper side in the engine room 43 and on the front side of the engine 18.
Is bolted to the lower surface of the horizontal plate 39A1.

Reference numeral 49 denotes a pattern switching valve mounted on the lower surface of the horizontal plate portion 39A1 of the engine front cover 39 by using a switching valve mounting bracket 48.
As described in Japanese Utility Model Publication No. 22482/1990, a column-shaped valve body 49A having a built-in directional control valve (not shown) and a directional control valve in the valve main body 49A are operated. It is substantially constituted by a switching lever 49B provided on one end face of the valve body 49A. Are connected to the valve body 49A of the pattern switching valve 49. The pilot hoses 50 are connected to the multiple valve device 21 and the pilot valve device 37.
Etc. are connected.

Here, the pattern switching valve 49 is connected to the valve body 4.
One end of 9A is bolted to a mounting plate 48B of the switching valve mounting bracket 48, and the other end is supported by the frame plate 48A via a support rod 49C. As described above, the pattern switching valve 49 allows the engine 18
Near the upper side of the bonnet 42, the switching lever 49B can be easily operated when the hood 42 is opened.

The pattern switching valve 49 is connected to each pilot valve 37A of the pilot valve device 37 and the multiple valve device 21.
Are provided between the control valves 22 to 25. As a result, the pattern switching valve 49 is configured such that each operation lever 36 is in front,
It switches the operation pattern when operated in the rearward direction, left and right directions, and the combination pattern of the control valves 22 to 25 of the multiple valve device 21.

Reference numeral 51 denotes a canopy that covers the upper side of the driver's seat 46. The canopy 51 is provided with columns 51A, 51A,. And a canopy roof 51B mounted on the column 51A.

The hydraulic shovel according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic shovel will be described.

First, the operator sits in the driver's seat 46,
Running levers 34, 34 provided on a lever stand 33
The lower traveling body 1 is tilted forward and rearward.
To run. At this time, the other operation lever 35 is tilted forward and backward to rotate the earth discharging device 4 upward and downward, thereby performing earth discharging work and the like by the earth discharging device 4. Can be.

The operator operates the operation levers 36, 36.
By operating the front and rear directions and the left and right directions as appropriate,
The upper swing body 2 can be swung on the lower traveling body 1 or the work apparatus 5 can be moved up and down to perform excavation work on earth and sand.

Here, the hydraulic shovel operates a combination pattern of the operation pattern of each operation lever 36 and the control valves 22, 23, 24, 25 of the multiple valve device 21, that is, the working device 5, etc., depending on the model. The operation pattern of the operation lever 36 at the time may be different. In this case, the operator is forced to work by operating the operation lever 36, which is unfamiliar.

However, according to the present embodiment, the pattern switching valve 49 is provided between each pilot valve 37A connected to the operation lever 36 and the control valves 22 to 25 of the multiple valve device 21. Switching lever 4 of pattern switching valve 49
By operating the directional switching valve in the valve body 49A by operating the control valve 9B, the operation pattern of the operation lever 36 and the control valve 2 are controlled.
A combination pattern of 2 to 25 can be switched. Thus, when operating the work device 5 or the like, the operation pattern of the operation lever 36 can be changed to one that is easy for the operator to operate.

When switching the pattern switching valve 49, the engine key is inserted into the lock 44C of the bonnet opening / closing device 44 provided on the bonnet 42, and the key is operated to unlock the lock 44C. open. As a result, the pattern switching valve 49 provided in the engine chamber 43 is exposed to the outside, so that the switching lever 49B provided in advance to the pattern switching valve 49 can be operated, and the switching operation of the pattern switching valve 49 is performed. Can be easily performed.

When the switching operation of the pattern switching valve 49 is completed, the bonnet 42 is closed and the lock 44C of the bonnet opening / closing device 44 is locked, whereby the switching operation of the pattern switching valve 49 can be prevented.

As described above, according to the present embodiment, the pattern switching valve 49 is connected to the engine room 4 of the engine cover 38.
3, the pattern switching valve 49 to which a large number of pilot hoses 50 are connected can be accommodated even by a small hydraulic shovel, and the operation of the hydraulic shovel can be controlled by the pattern switching valve 49. Can be enhanced.

Since the hood 42 for opening and closing the engine compartment 43 is provided with the hood opening and closing device 44 having the lock 44C, the hood 42 can be locked with the hood closed. As a result, the bonnet 42 can prevent an inadvertent switching operation of the pattern switching valve 49 disposed in the engine room 43, so that the pattern switching can be performed without preparing a special dedicated tool as in the prior art. The switching lever 49B can be attached to the switching valve 49 in advance.
Then, when the lock 44C is unlocked and the hood 42 is opened, the pattern switching valve 4 is operated by the switching lever 49B.
9 can be easily performed, and workability can be improved.

Since the pattern switching valve 49 is mounted on the existing engine front cover 39 via the switching valve mounting bracket 48, the engine front cover 39 is utilized without providing a pedestal having a complicated shape. Pattern switching valve 4
9 can be easily arranged in the engine room 43.

Further, since the pattern switching valve 49 is disposed near the engine 18, the pattern switching valve 4
9 can be warmed by the heat of the engine 18. Thus, the warm-up operation of the hydraulic oil can be efficiently performed in a winter or a cold region.

In the embodiment, the pattern switching valve 4
9 has been described as being mounted on the engine front cover 39 via the switching valve mounting bracket 48, but the present invention is not limited to this, and the valve body 49A of the pattern switching valve 49 is not limited to this.
And a bracket may be provided integrally with the front cover 39 via the bracket. Alternatively, a configuration may be adopted in which a leg is erected on the turning frame 16 and the pattern switching valve 49 is disposed on the leg.

In the embodiment, the engine cover 3
8 is constituted by four members of an engine front cover 39, a right cover 40, a left cover 41 and a bonnet 42, and the bonnet 42 is provided so as to be openable and closable.
The present invention is not limited to this.
As in the case of a hydraulic excavator disclosed in Japanese Patent Publication No. 67-67, the bonnet may be formed integrally with the right cover and the left cover, and may be configured as a single hood that can be opened and closed.

Further, in the embodiment, a small-sized hydraulic excavator has been described as an example of a swing type construction machine. However, the present invention is not limited to this, and other types of medium-sized, large-sized hydraulic excavators, hydraulic cranes, etc. The present invention can also be applied to a swing type construction machine.

[0067]

As described above in detail, according to the first aspect of the present invention, the engine cover including the engine front cover erected on the front side of the engine and the hood provided to open and close around the engine is provided. Since the pattern switching valve that defines the engine compartment and switches the combination pattern of the operation lever and each control valve is arranged at a position where the bonnet can be opened and operated in the engine compartment. The pattern switching valve can be provided by utilizing a large space for accommodating the engine and the like in the engine room. Thus, the pattern switching valve can be provided even in a small swing type construction machine, and the operability can be enhanced by the pattern switching valve.

When switching the pattern switching valve,
Switching can be easily performed only by opening the hood, and workability at the time of switching can be improved. Furthermore, since the pattern switching valve is disposed in the engine compartment, the operating oil flowing through the pattern switching valve can be warmed by the heat of the engine, and the warm-up operation in winter or a cold region can be efficiently performed.

According to the second aspect of the present invention, the bonnet is provided with a lock which can be opened and closed by key operation, and the pattern switching valve allows the pattern to be switched when the lock is unlocked and the bonnet is opened. When the lock is closed and the lock is locked, it is possible to prevent the pattern switching valve disposed in the engine compartment from being inadvertently switched. Further, when the lock is unlocked and the hood is opened, the operator can easily switch the pattern switching valve without using a dedicated tool, and the workability can be improved.

According to the third aspect of the present invention, since the pattern switching valve is located on the front side of the engine and is attached to the engine front cover, the pattern switching valve is switched to the space on the front side of the engine using the existing engine front cover. A valve can be mounted, and the pattern switching valve can be easily arranged in the engine compartment.

According to the fourth aspect of the present invention, the engine front cover has a substantially horizontal horizontal plate portion on which the driver's seat is mounted, and the pattern switching valve is mounted on the lower surface of the horizontal plate portion of the engine front cover. Therefore, it is possible to use the horizontal plate portion provided on the front cover of the engine for mounting the driver's seat, and attach the pattern switching valve to the lower surface side of the horizontal plate portion.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic shovel applied to an embodiment of the present invention.

FIG. 2 is a partially broken plan view showing the upper revolving superstructure with a driver's seat and a canopy removed.

FIG. 3 is a partially broken front view showing a pattern switching valve provided in an engine room together with an engine, a driver's seat and the like in an enlarged manner.

FIG. 4 is a front view of a state in which a pattern switching valve is attached to an engine front cover that is erected on a turning frame, as viewed from the same position as in FIG. 3;

FIG. 5 is a right side view of the upper revolving structure in a state where an engine room is opened by opening a hood;

FIG. 6 is a right side view of the upper revolving structure with the hood closed and the engine room closed, as viewed from the rear.

FIG. 7 is a hydraulic circuit diagram showing a connection relationship among a pilot valve, a control valve, a pattern switching valve, a cylinder, and the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 3 Revolving device 5 Working device 12 Boom cylinder 13 Arm cylinder 14 Bucket cylinder 16 Revolving frame 18 Engine 20 Hydraulic pump 22, 23, 24, 25 Control valve 22A, 23A, 24A, 25A Hydraulic pilot unit 28 Swing motor 31 Floor plate 36 Operating lever 37 Pilot valve device 37A Pilot valve 38 Engine cover 39 Engine front cover 39A Pedestal portion 39A1 Horizontal plate portion 42 Bonnet 43 Engine room 44 Bonnet opening / closing device 44C Lock 46 Driver's seat 49 Pattern switching valve 49A Valve body 49B switching lever

Continuing on the front page (72) Inventor Shinji Kobori 650, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. (72) Inventor Makoto Sugaya 650, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Tsuchiura, Hitachi Construction Machinery Co., Ltd. Inside the factory (72) Inventor Yoshiro Takeuchi 1828 Shinji, Chiyoda-cho, Shinji-gun, Ibaraki F-term (reference) 2D015 BA04 CA03

Claims (4)

[Claims] An undercarriage, an upper revolving body pivotally mounted on the undercarriage via a revolving device, and a working device provided at the front of the upper revolving body so as to be able to move up and down. The upper revolving superstructure comprises a revolving frame, an engine located on the revolving frame located on the rear side of the revolving frame, for driving a hydraulic pump, and supplying pilot pressure to a hydraulic pilot unit to perform the work. A plurality of control valves respectively controlling an actuator of the device and a swing motor of the swing device; an operation lever provided on a floor plate positioned in front of the swing frame and operating the work device and the swing motor; A plurality of pilot valves operated by the operation lever to supply pilot pressure to a pilot portion of each control valve; and a plurality of pilot valves provided between the pilot valves and the control valves. A revolving construction machine comprising a pattern switching valve for switching an operation pattern of the operation lever and a combination pattern of the control valves, wherein the engine front cover and the engine are provided on the front side of the engine. An engine room is defined by an engine cover including a bonnet provided so as to be openable and closable, and the pattern switching valve is arranged at a position where a switching operation can be performed when the bonnet is opened in the engine room. Swiveling construction machinery. 2. The swivel according to claim 1, wherein the bonnet is provided with a lock which can be opened and closed by a key operation, and the pattern switching valve is configured to unlock the lock and switch the pattern when the bonnet is opened. Construction machinery. 3. The revolving construction machine according to claim 1, wherein the pattern switching valve is located at a front side of the engine and is attached to the engine front cover. 4. The engine front cover has a substantially horizontal horizontal plate portion on which a driver's seat is mounted, and the pattern switching valve is mounted on the lower surface side of the horizontal plate portion of the engine front cover. , 2 or 3.