WO2023084994A1

WO2023084994A1 - Work machine

Info

Publication number: WO2023084994A1
Application number: PCT/JP2022/038429
Authority: WO
Inventors: 駿椎口
Original assignee: 株式会社クボタ
Priority date: 2021-11-11
Filing date: 2022-10-14
Publication date: 2023-05-19

Abstract

Provided is a work machine in which the location where a pattern-switching device (41) is positioned can be ensured even if it the work machine is small.　This work machine is equipped with a plurality of hydraulic actuators (15, 16, 17, M1), the work machine comprising a machine body (2), a driver seat (5) installed on the machine body (2), an operation console (20) erected on the machine body (2) in front of the driver seat (5), a steering member (31) for operating the plurality of hydraulic actuators (15, 16, 17, M1), and a pattern-switching device (41) for switching an operation pattern for the plurality of hydraulic actuators (15, 16, 17, M1) of the steering member (31) to a plurality of operation patterns. The interior of the operation console (20) has a switching device positioning section (46) where the pattern-switching device (41) is positioned.

Description

work machine

The present invention relates to working machines.

Conventionally, the work machine disclosed in Patent Document 1 is known.

The work machine disclosed in Patent Document 1 is equipped with a plurality of hydraulic actuators. A control member for operating a plurality of hydraulic actuators is provided on the side of the driver's seat mounted on the fuselage. Further, the airframe is equipped with a pattern switching device for switching the operation pattern for the plurality of hydraulic actuators of the control member to a plurality of operation patterns. The pattern switching device is arranged below the driver's seat.

Japanese Patent Publication "JP 2014-32462"

By the way, with small work machines, there is the problem that it is difficult to place the pattern switching device under the driver's seat due to space considerations.

In view of the above problems, it is an object of the present invention to provide a work machine that can secure a place for arranging a pattern switching device even if it is a small work machine.

A work machine according to one aspect of the present invention is a work machine equipped with a plurality of hydraulic actuators, comprising a machine body, a driver's seat mounted on the machine body, and a driver's seat erected on the machine body in front of the driver's seat. a control panel that operates the plurality of hydraulic actuators; and a pattern switching device that switches an operation pattern of the plurality of hydraulic actuators of the control panel to a plurality of operation patterns, wherein the control panel includes an internal has a switching device arranging section for arranging the pattern switching device in the .

The work machine includes a traveling device that supports the machine body so as to be able to travel, and a traveling lever that is provided at a substantially central portion in the width direction of the machine body on the upper part of the operating platform and operates the traveling device, and the operating platform. has a support frame attached to the fuselage, a cover member covering the support frame, and a travel lever support portion provided on an upper portion of the support frame for supporting the travel lever, wherein the switching device arrangement The portion may be provided on the side of the travel lever support portion in the vehicle body width direction inside the cover member and on the upper portion of the support frame.

The work machine includes a control valve including a plurality of control valves that control the plurality of hydraulic actuators, and the support frame includes a first side plate and a second side plate that are arranged to face each other with a gap in the width direction of the machine body; a connecting plate that connects upper portions of the first side plate and the second side plate; the control valve is disposed below the connecting plate and between the first side plate and the second side plate; The travel lever support portion is provided on the connecting plate at a substantially central portion in the width direction of the machine body, and the switching device arrangement portion is arranged between the travel lever support portion and the first side plate or the second side plate on the connection plate. may be provided between

The operation table has an opening formed in the cover member at a position corresponding to the pattern switching device, and a cover member for opening and closing the opening, and the plurality of operation patterns are a first operation pattern. and a second operation pattern that is an operation pattern different from the first operation pattern, wherein the pattern switching device includes a first operation position for switching the operation pattern to the first operation pattern; A drawer having a switching lever capable of swinging at a second operating position for switching between two operating patterns, the switching lever projecting from the opening at each of the first operating position and the second operating position. and a retracted state in which the cover member is accommodated inside the lid member.

A work machine according to an aspect of the present invention is a work machine equipped with a plurality of hydraulic actuators, comprising a machine body, a cover member mounted on the machine body, an operating member for operating the plurality of hydraulic actuators, a pattern switching device for switching an operation pattern for the plurality of hydraulic actuators of the steering member to a plurality of operation patterns, the pattern switching device being housed inside the cover member, wherein the cover member an opening formed at a position corresponding to a switching device; and a lid member for opening and closing the opening, the plurality of operation patterns including a first operation pattern and a second operation pattern, and the pattern switching The device has a switching lever capable of swinging between a first operation position for switching the operation pattern to the first operation pattern and a second operation position for switching the operation pattern to the second operation pattern. The lever is movable between a drawn-out state in which it projects from the opening and a retracted state in which it is housed inside the lid member at each of the first operating position and the second operating position.

In the working machine, when the switching lever is moved in a direction from the pulled-out state to the retracted state in an operation range between the first operation position and the second operation position, the switching lever is moved to the A contact member may be provided that protrudes from the opening and abuts against the movement of the switching lever.

The work machine includes a plurality of control valves that are provided corresponding to the plurality of hydraulic actuators to control the plurality of hydraulic actuators and that are pilot-operated by the manipulating member; a pattern switching valve that switches the operation pattern by switching the direction of the flow of pilot oil that pilot-operates the control valve by means of a pattern switching valve; a rocking arm rotatably supported and having a switching lever support portion for movably supporting the switching lever between the pulled-out state and the retracted state; and a valve body of the rocking arm and the pattern switching valve. It may have an interlocking mechanism that interlocks and connects the.

According to the working machine described above, it is possible to secure a place for arranging the pattern switching device even with a small working machine.

It is a side view of a working machine. 1 is a perspective view of a driver's seat and the surroundings of the driver's seat; FIG. It is a perspective view of a console. It is a perspective view inside a console. It is an oil-path circuit diagram. FIG. 10 is a diagram showing an example of an operation pattern; FIG. It is the perspective view which looked at the pattern switching device from the front. It is the perspective view which looked at the pattern switching device from the back. It is a side cross-sectional view of a portion where the pattern switching device is arranged. FIG. 4 is a plan view of the pattern switching device in the first operation pattern; FIG. 11 is a plan view of the pattern switching device in the second operation pattern; FIG. 4 is a perspective view of the console with the cover member opened; FIG. 4 is a plan view showing each position of a switching lever; FIG. 10 is a plan view of a pattern switching device according to another embodiment; FIG. 11 is a perspective view of a pattern switching device according to another embodiment;

An embodiment of the present invention will be described below with appropriate reference to the drawings.

FIG. 1 is a schematic side view of the working machine 1 according to this embodiment. In this embodiment, a small backhoe that is a turning work machine is exemplified as the work machine 1 .

As shown in FIG. 1, the working machine 1 includes a traveling body 1A and a working device 4 mounted on the traveling body 1A. The traveling body 1</b>A has a traveling device 3 and a body (swivel base) 2 mounted on the traveling device 3 . The machine body 2 is equipped with a driver's seat 5 on which an operator sits.

In this embodiment, the front side of the operator seated in the driver's seat 5 (direction of arrow K1 in FIG. 1) is forward, the rear side of the operator (direction of arrow K2 in FIG. 1) is rearward, and the operator's left side (front side in FIG. 1) ) is the left side, and the operator's right side (back side in FIG. 1) is the right side. Further, the direction of arrow K3 in FIG. 1 will be described as the front-rear direction (body front-rear direction), and the horizontal direction perpendicular to the front-rear direction K3 will be described as the body width direction (width direction of the body 2). The direction from the central portion in the width direction of the body 2 to the right or left portion will be described as the outer side of the body (outer side in the width direction of the body). That is, the outer side of the fuselage is the width direction of the fuselage and the direction away from the center of the fuselage 2 in the width direction. The direction opposite to the outer side of the fuselage will be described as the inner side of the fuselage (the inner side in the width direction of the fuselage). That is, the inward direction of the body is the width direction of the body and the direction toward the center of the body 2 in the width direction.

As shown in FIG. 1, the body 2 is supported by the travel device 3 so as to be rotatable about a vertical axis (an axis extending in the vertical direction). The fuselage 2 has a swivel base plate 6 forming a bottom portion of the fuselage 2 and a weight 7 attached to the rear portion of the swivel base plate 6 . The turning base plate 6 is supported on the frame of the travel device 3 via a bearing 19 so as to be able to turn around the vertical axis, and is turned left and right by driving a turning motor M1 composed of a hydraulic motor (hydraulic actuator). A step plate 26 is arranged above the swivel base plate 6 for the operator sitting on the driver's seat 5 to put his/her feet on. A side cover 27 covers a space between the turning base plate 6 and the step plate 26 . A working device 4 is attached to the front part of the machine body 2 . The weight 7 is a counterweight for balancing the weight with the working device 4 . Rops 24 are provided on the body 2 to protect the operator sitting on the driver's seat 5. - 特許庁

A bonnet 8 is arranged above the rear part of the fuselage 2 . A driver's seat 5 is arranged above the bonnet 8 . The inside of the hood 8 can be opened by rotating the hood 8 rearward, as indicated by the two-dot chain line in FIG. Inside the bonnet 8 are a prime mover 10 as a drive source, a hydraulic cylinder equipped in the working machine 1, a hydraulic oil tank 9 storing hydraulic oil for driving hydraulic actuators such as a hydraulic motor, and a hydraulic oil tank 9. A hydraulic pump (not shown) or the like is arranged to suck up and discharge the working oil inside. Although a diesel engine is used as the prime mover 10 in the present embodiment, it is not limited to this, and may be another internal combustion engine such as a gasoline engine, an electric motor, or the like.

As shown in FIG. 1, the traveling device 3 is a crawler type traveling device, and is provided below the right side and the left side of the body 2, respectively. The travel device 3 is driven by a travel motor 28 which is a hydraulic motor. A dozer 11 is provided in front of the travel device 3 . The dozer 11 is driven by a dozer cylinder (not shown).

As shown in FIG. 1, the working device 4 has a boom 12, an arm 13, and a bucket 14 as a working tool. Further, the working device 4 has a boom cylinder 15, an arm cylinder 16, and a bucket cylinder 17 as a work implement cylinder as drive mechanisms for these booms and the like. The boom cylinder 15, the arm cylinder 16, the bucket cylinder 17 and the dozer cylinder are composed of hydraulic cylinders (hydraulic actuators). These hydraulic cylinders are driven by hydraulic fluid supplied from a hydraulic fluid tank 9 via a hydraulic pump. The work device 4 is operated by a control lever 31, which will be described later.

The base end of the boom 12 is pivotally supported by a swing bracket 18 provided at the front of the fuselage 2 so as to be swingable around the horizontal axis. The swing bracket 18 is pivotally supported on a support bracket 29 provided on the body 2 so as to be capable of swinging about a vertical axis. A swing cylinder (not shown) consisting of a hydraulic cylinder is attached to the machine body 2, and the swing bracket 18 is swung by driving the swing cylinder. A base end of an arm 13 is pivotally supported on a tip end of the boom 12 so as to be swingable about a horizontal axis. A bucket 14 is attached to the tip of the arm 13 .

The boom cylinder 15 connects the swing bracket 18 and the middle portion of the boom 12 . The boom 12 swings up and down by extension and contraction of the boom cylinder 15 . In this embodiment, the boom 12 swings in the boom raising direction D1 by contracting the boom cylinder 15, and the boom 12 swings in the boom lowering direction D2 by extending the boom cylinder 15.

The arm cylinder 16 connects the middle portion of the boom 12 and the base end portion of the arm 13 . The arm 13 swings up and down as the arm cylinder 16 expands and contracts. In this embodiment, contraction of the arm cylinder 16 swings the arm 13 in an arm raising direction (arm dumping direction) D3, and expansion of the arm cylinder 16 swings in an arm lowering direction (arm crowding direction) D4. do.

The bucket cylinder 17 connects the base end of the arm 13 and the mounting portion of the bucket 14 . The bucket 14 performs scooping and dumping operations as the bucket cylinder 17 expands and contracts. In this embodiment, the contraction of the bucket cylinder 17 causes the bucket 14 to swing in the dumping direction (bucket dumping direction) D5, and the expansion of the bucket cylinder 17 causes the bucket 14 to swing in the scooping direction (bucket crowding direction) D6. move.

As shown in FIG. 2 , a control table 30 is arranged on the left and right sides of the driver's seat 5 . The control console 30 arranged to the left of the driver's seat 5 is called a first control console 30L, and the control console 30 arranged to the right of the driver's seat 5 is called a second control console 30R.

A control member 31 (first control lever 31L) that operates a plurality of hydraulic actuators and a remote control valve 21 (first remote control valve 21L) that is a pilot valve operated by the first control lever 31L are provided on the first control platform 30L. and a first operating lever 43L for vertically swinging the first control table 30L.

The first control lever 31L can operate two operation targets provided on the work machine 1 . Specifically, the first control lever 31L can be tilted forward, backward, leftward, and rightward, and tilts forward and backward to operate one manipulation target, and tilts left and right to manipulate another manipulation target. By operating the first remote control valve 21L, the first control lever 31L pilot-operates a control valve (pilot-operated switching valve) that controls an operation target. More specifically, when the first control lever 31L is tilted back and forth or left and right, pilot oil corresponding to the amount of tilting is output from the first remote control valve 21L to the control valve that controls the object to be operated.

The second control table 30R includes a control member 31 (second control lever 31R) that operates a plurality of hydraulic actuators, and a remote control valve 21 (second remote control valve 21R) that is a pilot valve operated by the second control lever 31R. and a second operating lever 43R for vertically swinging the second control table 30R.

The second control lever 31R can also operate two operation targets provided on the work machine 1. Specifically, the second control lever 31R can also be tilted forward, backward, left, and right, and tilting forward and backward operates one manipulation target, and tilting left and right manipulates another manipulation target. By operating the second remote control valve 21R, the second control lever 31R pilot-operates a control valve (pilot-operated switching valve) that controls an operation target. More specifically, when the second control lever 31R is tilted back and forth or left and right, pilot oil corresponding to the amount of tilting is output from the second remote control valve 21R to the control valve that controls the object to be operated.

The objects to be operated by the first control lever 31L and the second control lever 31R are, for example, the turning motor M1 (body 2), the boom cylinder 15 (boom 12), the arm cylinder 16 (arm 13), and the bucket cylinder 17 (bucket 14). be. In other words, the operation member 31 can perform the turning operation of the machine body 2, the swinging operation of the boom 12, the swinging operation of the arm 13, and the swinging operation of the bucket 14.

As shown in FIG. 1, the operation console 20 is provided on the front part of the step plate 26. As shown in FIG. The operation console 20 is erected on the aircraft body 2 in front of the driver's seat 5 and the bonnet 8 . Various operation members are attached to the operation table 20 .

As shown in FIG. 3, various operating members are a pair of travel levers 22, a dozer lever 60, an accelerator lever 61, a swing pedal 32, a shift pedal 33, an SP pedal 34, and the like. The pair of travel levers 22 are levers for operating the travel device 3 (travel motor 28). The dozer lever 60 is a lever for operating the dozer 11 (dozer cylinder). The accelerator lever 61 is a lever that controls rotation of the prime mover 10 . The swing pedal 32 is a pedal that operates the swing bracket 18 (swing cylinder). The speed change pedal 33 is a pedal for switching the speed of the traveling device 3 between the first speed and the second speed, which is faster than the first speed. The SP pedal 34 is a pedal for operating another working tool (hydraulic attachment) that can be driven by a hydraulic actuator and is mounted in place of or in addition to the bucket 14 .

As shown in FIG. 4 , the operation table 20 has a support frame 36 attached to the machine body 2 and a cover member 37 that covers the support frame 36 .

The support frame 36 has a first side plate 36A, a second side plate 36B, a connecting plate 36C and a fixing plate 36D. The first side plate 36A and the second side plate 36B are formed of vertically elongated plates, and are arranged to face each other with a gap in the width direction of the machine body so that the plate surface faces the width direction of the machine body. The connecting plate 36C is arranged between the upper portions of the first side plate 36A and the second side plate 36B, and connects the upper portions of the first side plate 36A and the second side plate 36B. The fixed plate 36D is fixed to the lower end of the first side plate 36A and the lower end of the second side plate 36B, and is fixed to the body 2 (step plate 26) with bolts or the like.

As shown in FIG. 3, the cover member 37 is divided into a front cover 37A and a rear cover 37B.

As shown in FIG. 4, the pair of travel levers 22 are arranged side by side in the width direction of the machine body at substantially the center of the operation console 20 in the width direction of the machine body. A base portion of the travel lever 22 is disposed within the cover member 37, and is swingable in the front-rear direction K3 on a travel lever support portion 38 provided substantially at the center of the connecting plate 36C (operation table 20) in the width direction of the machine body. Supported. Upper portions of the pair of travel levers 22 protrude upward from the cover member 37 .

A control valve 23 is arranged inside the operation console 20 . The control valve 23 is arranged below the connecting plate 36C and between the first side plate 36A and the second side plate 36B, and is attached to the first side plate 36A and the second side plate 36B. That is, the control valve 23 is attached to the support frame 36 .

The control valve 23 is an assembly of a plurality of control valves V1 to V10 that control hydraulic actuators installed in the working machine 1 (including hydraulic actuators installed later). Specifically, the control valve 23 is a valve unit configured by arranging a plurality of control valves V1 to V10 in the width direction of the machine body and connecting them to each other. The control valve 23 may have a structure in which a plurality of control valves are incorporated inside a common valve body.

The control valve that constitutes the control valve 23 is a direct-acting spool type directional switching valve that switches the direction of hydraulic fluid that operates the hydraulic actuator. Specifically, the control valves include a gear shift control valve V1, a swing control valve V2, an arm control valve V3, a first travel control valve V4, a dozer control valve V5, a backup control valve V6, a second travel , a swing control valve V8, a bucket control valve V9, and a boom control valve V10.

The speed change control valve V1 is operated by the speed change pedal 33, and controls, for example, a swash plate angle cylinder that changes the tilt angle of the swash plate of the traveling motor 28. The swing control valve V2 controls the swing motor M1. The arm control valve V3 controls the arm cylinder 16 . The first travel control valve V4 is operated by the left travel lever 22 to control the travel motor 28 of the left travel device 3 . A dozer control valve V5 is operated by a dozer lever 60 to control a dozer cylinder. The spare control valve V6 is operated by the SP pedal 34 to control the hydraulic attachment. The second travel control valve V7 is operated by the right travel lever 22 to control the travel motor 28 of the right travel device 3 . The swing control valve V8 is operated by the swing pedal 32 to control the swing cylinder. The bucket control valve V9 controls the bucket cylinder 17 . A boom control valve V<b>10 controls a boom cylinder 15 .

The swing control valve V2, the arm control valve V3, the bucket control valve V9, and the boom control valve V10 are the first control lever 31L (first remote control valve 21L) and the second control lever 31R (second remote control valve 21R). It is a pilot-operated switching valve that is pilot-operated by

Further, the speed change control valve V1, the first travel control valve V4, the dozer control valve V5, the reserve control valve V6, the second travel control valve V7, and the swing control valve V8 are mounted on the operation console 20. control valves (other control valves) that control objects operated by various operating members (speed change pedal 33, travel lever 22, dozer lever 60, SP pedal 34, swing pedal 32).

It should be noted that the arrangement of the control valves in the control valve 23 is an example and is not limited to that shown in the drawing.

As shown in FIG. 2, a first tube 39A and a second tube 39B made of flexible tubes are routed to the lower end on the left side of the bonnet 8. As shown in FIG. The first tube 39A extends from the back side of the first remote control valve 21L, passes through the inside of the machine body 2, and is routed to the lower end on the left side of the operation console 20 (see FIG. 3). A plurality of pilot hoses connected to the first remote control valve 21L are bundled and inserted (accommodated) in the first tube 39A. The second tube 39B extends from the back side of the second remote control valve 21R and is routed through the inside of the machine body 2 to the lower end on the left side of the operation console 20 (see FIG. 3). A plurality of pilot hoses connected to the second remote control valve 21R are bundled and inserted (accommodated) in the second tube 39B.

As shown in FIGS. 3 and 4, inside the operation table 20, there are a plurality of hydraulic actuators (boom cylinder 15, arm cylinder 16, bucket cylinder) of the control member 31 (first control lever 31L, second control lever 31R). 17, a pattern switching device 41 is provided for switching the operation pattern for the turning motor M1) to a plurality of operation patterns. The pattern switching device 41 has a pattern switching valve 42 that switches the operation pattern by switching the direction of the flow of the pilot oil that pilot-operates the control valve by the control member 31 .

As shown in FIG. 5, in the present embodiment, the pattern switching valve 42 is provided in the middle of a pilot circuit extending between the first remote control valve 21L and the second remote control valve 21R, the boom control valve V10 and the arm control valve V3. It is Specifically, the first remote control valve 21L is connected to the pattern switching valve 42 by a first pilot oil passage F1 and a second pilot oil passage F2. The second remote control valve 21R is connected to the pattern switching valve 42 by a third pilot oil passage F3 and a fourth pilot oil passage F4. The arm control valve V3 has a dumping pressure receiving portion 44a and a crowding pressure receiving portion 44b. 44b is connected to the pattern switching valve 42 via the sixth pilot oil passage F6. The boom control valve V10 has a lowering pressure receiving portion 45a and a raising pressure receiving portion 45b. 45b is connected to the pattern switching valve 42 via the eighth pilot oil passage F8.

In this embodiment, the operation patterns switched by the pattern switching device 41 include the first operation pattern and the second operation pattern shown in FIG.

As shown in FIG. 6, in the first operation pattern, tilting the first control lever 31L back and forth causes the arm 13 to swing, and tilting the first control lever 31L left and right causes the machine body 2 to turn. Further, the boom 12 swings when the second control lever 31R is tilted back and forth, and the bucket 14 swings when the second control lever 31R is tilted left and right.

In the second operation pattern, tilting the first control lever 31L back and forth causes the boom 12 to swing, and tilting the first control lever 31L left and right causes the machine body 2 to turn. Further, the forward and rearward tilting operation of the second control lever 31R causes the arm 13 to swing, and the leftward and rightward tilting operation of the second control lever 31R causes the bucket 14 to swing.

As described above, in this embodiment, in the first operation pattern, the arm 13 is operated by tilting the first control lever 31L back and forth, and the boom 12 is operated by tilting the second control lever 31R back and forth. On the other hand, in the second operation pattern, the boom 12 is operated by tilting the first control lever 31L back and forth, and the arm 13 is operated by tilting the second control lever 31R back and forth.

Specifically, in the first operation pattern, when the first control lever 31L is tilted forward, the pilot pressure is applied to the dumping pressure receiving portion 44a through the first pilot oil passage F1→pattern switching valve 42→fifth pilot oil passage F5. When the arm cylinder 16 is contracted and the arm 13 is dumped, and the first control lever 31L is tilted backward, the pilot pressure changes from the second pilot oil passage F2 to the pattern switching valve 42 to the sixth pilot oil passage F6. , the arm cylinder 16 is extended and the arm 13 performs the cloud operation. Further, when the second control lever 31R is tilted forward, the pilot pressure is applied to the lowering pressure receiving portion 45a through the third pilot oil passage F3→the pattern switching valve 42→the seventh pilot oil passage F7, and the boom cylinder 15 is operated. When the boom is extended and the boom is lowered, and the second control lever 31R is tilted backward, the pilot pressure passes through the fourth pilot oil passage F4, the pattern switching valve 42, and the eighth pilot oil passage F8 to the raising pressure receiving portion 45b. As a result, the boom cylinder 15 is contracted and the boom 12 is raised.

In the second operation pattern, when the first control lever 31L is tilted forward, the pilot pressure acts on the lowering pressure receiving portion 45a through the first pilot oil passage F1→pattern switching valve 42→seventh pilot oil passage F7. Then, when the boom cylinder 15 extends to lower the boom 12 and tilt the first control lever 31L backward, the pilot pressure changes from the second pilot oil passage F2 to the pattern switching valve 42 to the eighth pilot oil passage F8. After that, it acts on the lifting pressure receiving portion 45b, the boom cylinder 15 is contracted, and the boom 12 is raised. Further, when the second control lever 31R is tilted forward, the pilot pressure is applied to the dumping pressure receiving portion 44a through the third pilot oil passage F3→pattern switching valve 42→fifth pilot oil passage F5, and the arm cylinder 16 is moved. When the arm 13 contracts and performs a dump operation and the second control lever 31R is tilted backward, the pilot pressure passes through the fourth pilot oil passage F4→the pattern switching valve 42→the sixth pilot oil passage F6, and then the cloud pressure receiving portion 44b. , the arm cylinder 16 is extended and the arm 13 is clouded.

The number of operation patterns switched by the pattern switching device 41 may be three or more, and the control valves switched by the pattern switching device 41 are limited to the boom control valve V10 and the arm control valve V3. never.

　As shown in FIGS. 3 and 4, the pattern switching device 41 is arranged in the upper part of the operation console 20. As shown in FIG. In this embodiment, the pilot hoses routed from the first remote control valve 21L and the second remote control valve 21R to the operation console 20 are inserted from the lower end on the left side of the operation console 20, so that the pilot hoses can be easily routed. Furthermore, the pattern switching device 41 is arranged on the upper left side within the operation console 20 . However, the pattern switching device 41 may be arranged on the upper right side within the operation console 20 .

As shown in FIG. 4 , the pattern switching device 41 is arranged inside the cover member 37 on the side of the travel lever support portion 38 in the machine body width direction and on the upper portion of the support frame 36 . In other words, the operation table 20 has a switching device arrangement portion 46 in which the pattern switching device 41 is arranged. It is provided on the side of the direction and the upper part of the support frame 36 . Specifically, the switching device arrangement portion 46 is provided between the traveling lever support portion 38 and the first side plate 36A on the connecting plate 36C. The switching device arrangement portion 46 may be provided between the traveling lever support portion 38 and the second side plate 36B on the connecting plate 36C.

7 and 8, the pattern switching device 41 includes a valve bracket 47 to which the pattern switching valve 42 is attached, the pattern switching valve 42, an operating mechanism 48 for operating the pattern switching valve 42, and a contact member 49. and

The valve bracket 47 includes a mounting wall 47a superimposed on the connecting plate 36C and attached to the connecting plate 36C with bolts or the like, and a vertical wall extending upward from the right end of the mounting wall 47a (on the travel lever support portion 38 side). 47b.

As shown in FIG. 9, the pattern switching valve 42 is configured by a rotary valve and has a valve body 42a and a valve body 42b.

As shown in FIGS. 7 and 8, the valve body 42a is arranged above the mounting wall 47a of the valve bracket 47 and to the left of the vertical wall 47b, and is fixed to the vertical wall 47b with bolts or the like.

As shown in FIG. 9, the valve body 42b is formed in a substantially columnar shape and is inserted into the valve body 42a so as to be rotatable around an axis extending in the vertical direction. An upper portion of the valve body 42b protrudes upward from the valve body 42a.

As shown in FIG. 7, ports (first port P1, second port P2, third port) connected to the remote control valve 21 (first remote control valve 21L, second remote control valve 21R) are provided on the front surface of the valve body 42a. P3 and a fourth port P4) are formed. For example, as shown in FIG. 5, the first port P1 is connected to the first pilot oil passage F1, the second port P2 is connected to the second pilot oil passage F2, and the third port P3 is connected to: A third pilot oil passage F3 is connected. A fourth pilot oil passage F4 is connected to the fourth port P4.

As shown in FIG. 8, ports (fifth port P5, sixth port P6, seventh port P7) connected to control valves (boom control valve V10, arm control valve V3) are provided on the rear surface of the valve body 42a. and an eighth port P8). For example, as shown in FIG. 5, the fifth port P5 is connected to the fifth pilot oil passage F5, the sixth port P6 is connected to the sixth pilot oil passage F6, and the seventh port P7 is connected to: A seventh pilot oil passage F7 is connected, and an eighth pilot oil passage F8 is connected to the eighth port P8.

As shown in FIG. 7, a first restricting portion 50A and a second restricting portion 50B are provided on the upper surface of the valve body 42a. The first restricting portion 50A and the second restricting portion 50B are each formed by a pin. The first restricting portion 50A is provided in the front portion of the upper surface of the valve body 42a (in front of the upper portion of the valve body 42b). The second restricting portion 50B is provided on the right side of the upper surface of the valve body 42a (on the upper right side of the valve body 42b).

As shown in FIG. 7, a contact portion 51 is provided on the upper portion of the valve body 42b. The contact portion 51 is formed by a pin. The contact portion 51 is provided to project radially outward from the valve body 42b. As shown in FIG. 10, the contact portion 51 contacts the first restricting portion 50A from the right side to restrict counterclockwise rotation of the valve body 42b. Further, as shown in FIG. 11, the contact portion 51 contacts the second restricting portion 50B from the front to restrict the clockwise rotation of the valve body 42b. Therefore, the valve body 42b can be switched between a position where the contact portion 51 contacts the first restricting portion 50A and a position where the contact portion 51 contacts the second restricting portion 50B. 10 shows the state of the pattern switching device 41 when the operation pattern is switched to the first operation pattern, and FIG. 11 shows the state of the pattern switching device 41 when the operation pattern is switched to the second operation pattern. state.

As shown in FIGS. 7 and 8, the operating mechanism 48 has a rotating support shaft 52, a swinging arm 53, a switching lever 54, and an interlocking mechanism 55.

As shown in FIGS. 10 and 11, the rotating support shaft 52 is arranged to extend vertically above the rear and right portions of the pattern switching valve 42 . The rotating support shaft 52 has its lower portion fixed to a support stay 56 fixed to the upper portion of the vertical wall 47b of the valve bracket 47 (see FIG. 9).

As shown in FIGS. 7, 8, and 10, the swing arm 53 has a support piece 53a, a switching lever support portion 53b, and an arm portion 53c. The support piece 53a is supported by the rotation support shaft 52 so as to be rotatable about the axis. Therefore, the swing arm 53 can swing back and forth around the axis of the pivot shaft 52 . The support piece 53a is rotated by a disk spring 57 inserted through the rotation support shaft 52 and superimposed on the support piece 53a, and a detent nut 58 screwed into the rotation support shaft 52 above the disk spring 57. resistance is provided.

As shown in FIG. 8, the switching lever support portion 53b is provided at the lower end of an extension portion 53d extending downward from the support piece 53a. The switching lever support portion 53b is formed in a tubular shape (cylindrical shape).

As shown in FIGS. 7 and 8, the arm portion 53c extends from the support piece 53a toward the first side plate 36A.

As shown in FIGS. 7, 8, and 10, the switching lever 54 is an operation member for switching the operation pattern between the first operation pattern and the second operation pattern. The switching lever 54 has a lever shaft 54A and a lever grip 54B. The lever shaft 54A is formed of a bar (round bar) and is inserted through the switching lever support portion 53b so as to be axially movable. The lever grip 54B is provided on the rear (base) side of the lever shaft 54A. A stopper 59 is provided on the tip side of the lever shaft 54A to prevent the lever shaft 54A from slipping out of the switching lever support portion 53b by coming into contact with the switching lever support portion 53b.

As shown in FIGS. 7, 8 and 10, the interlocking mechanism 55 has a first link 55A and a second link 55B. One end of the first link 55A is pivotally connected to the left end of the arm portion 53c of the swing arm 53 via the first pivot 62A. One end of the second link 55B is fixed by a bolt 63 to the upper surface of the valve body 42b. The other end side of the first link 55A and the other end side of the second link 55B are pivotally connected via a second pivot 62B.

As shown in FIGS. 7, 8 and 10, the contact member 49 is arranged at the upper and rear portion of the right side surface of the vertical wall 47b of the valve bracket 47. As shown in FIGS. The contact member 49 is formed of a bar (round bar) and has a first portion 49a and a second portion 49b. The first portion 49a is fixed to the right side surface of the vertical wall 47b and extends in the body width direction (rightward from the vertical wall 47b). The second portion 49b extends upward from the right end of the first portion 49a. The space between the second portion 49b and the vertical wall 47b is formed such that the lever shaft 54A of the switching lever 54 can pass therethrough.

As shown in FIGS. 9, 10, and 11, the operation table 20 includes an opening 64 formed in the cover member 37 at a position corresponding to the pattern switching device 41, and a lid member 65 for opening and closing the opening 64. have. In this embodiment, as shown in FIG. 3, the opening 64 and the lid member 65 are provided on the upper and left portions of the rear surface (driver's seat 5 side) of the cover member 37 . The cover member 65 has a lower portion supported by a support portion 66 so as to be rotatable around the axis of a support shaft 67 extending in the width direction of the machine body, and a fixing member 68 whose upper portion is screwed to the cover member 37 side in the closed state. held closed by Therefore, the lid member 65 rotates downward to open the opening 64 by removing the fixing member 68, as indicated by the two-dot chain line in FIG.

As shown in FIG. 10, when the operation pattern of the pattern switching device 41 is switched to the first operation pattern, the switching lever 54 is in the first operation position 70A extending in the front-rear direction. In the first operating position 70A, the switching lever 54 is in a pulled-out state (first pulled-out state) 71A in which the stopper 59 contacts the switching lever support portion 53b, as indicated by the solid line in FIG. As indicated by the chain double-dashed line in FIG. 10, the lever grip 54B can move to a retracted state (first retracted state) 72A in which the lever grip 54B is pushed forward to a position where it contacts the switching lever support portion 53b.

As shown in FIGS. 10 and 12, the switching lever 54 protrudes from the opening 64 in the first drawn state 71A. As a result, it is possible to easily perform the switching operation (lever operation) of the operation pattern. Further, as shown in FIG. 10, the switching lever 54 is housed inside the lid member 65 (inside the cover member 37) in the first stored state 72A. As a result, the switching lever 54 does not get in the way when the operator gets on or off the work machine 1 or when he/she operates the operation members mounted on the operation table 20 . Also, in the first retracted state 72A, the switching lever 54 passes between the second portion 49b of the contact member 49 and the vertical wall 47b, and its tip is located forward of the contact member 49. As shown in FIG.

In the state shown in FIG. 10, the arm portion 53c extends to the left from the pivot shaft 52, the first link 55A is inclined to the right as it goes forward, and the second link 55B is the valve. It protrudes leftward from the body 42b (extends in the body width direction). The contact portion 51 contacts the first restricting portion 50A from the right side.

From the state shown in FIG. 10, when the switching lever 54 is swung to the left around the axis of the pivot shaft 52 to the position indicated by the two-dot chain line X1 (second operation position 70B), as shown in FIG. Then, the arm portion 53c swings forward about the axis of the pivot shaft 52 to push the first link 55A forward. Then, the first link 55A pushes the other end of the second link 55B forward, and the valve body 42b rotates clockwise. Then, when the contact portion 51 contacts the second restricting portion 50B from the front, the rotation of the valve body 42b, the rocking of the rocking arm 53, and the rocking of the switching lever 54 are restricted. Thereby, the operation pattern is switched from the first operation pattern to the second operation pattern.

As shown in FIG. 11, when the operation pattern is switched to the second operation pattern, the pattern switching device 41 extends in a tilt direction that shifts rightward as the switching lever 54 goes forward. 2 operation position 70B. In the second operating position 70B, the switching lever 54 is in a pulled-out state (second pulled-out state) 71B in which the stopper 59 contacts the switching lever support portion 53b, as indicated by the solid line in FIG. As indicated by the chain double-dashed line in FIG. 11, the lever grip 54B can move to a retracted state (second retracted state) 72B in which the lever grip 54B is pushed forward to a position where it contacts the switching lever support portion 53b.

As shown in FIGS. 11 and 12, the switching lever 54 protrudes from the opening 64 in the second drawn state 71B. As a result, it is possible to easily perform the switching operation (lever operation) of the operation pattern. Further, as shown in FIG. 11, the switching lever 54 is housed inside the lid member 65 (inside the cover member 37) in the second stored state 72B. As a result, the switching lever 54 does not get in the way when the operator gets on or off the work machine 1 or when he/she operates the operation members mounted on the operation table 20 . In addition, the switching lever 54 is located on the right side of the second portion 49b of the contact member 49 in the second retracted state 72B.

11, when the switching lever 54 is swung leftward about the axis of the pivot shaft 52 to the first operation position 70A indicated by the chain double-dashed line, the operation pattern changes from the second operation pattern. Switched to the first operation pattern.

Note that switching between the first operation pattern and the second operation pattern is not performed when the switching lever 54 is positioned at the first operation position 70A or the second operation position 70B, but at the first operation position 70A or the second operation position 70B. This is done before reaching the operating position 70B. That is, when the switching lever 54 is swung from the first operating position 70A to the second operating position 70B, the operating pattern is switched to the second operating pattern before the switching lever 54 reaches the second operating position 70B. When the switching lever 54 is swung from the second operating position 70B to the first operating position 70A, the operation pattern is switched to the first operating pattern before the switching lever 54 reaches the first operating position 70A.

As shown in FIG. 13, when the switching lever 54 is in the first operating position 70A or the second operating position 70B, the contact member 49 moves the switching lever 54 into the retracted state (first retracted state 72A, second retracted state). 72B), the switching lever 54 does not come into contact with the contact member 49 (second portion 49b), but the position between the first operating position 70A and the second operating position 70B (the second operating position 70A rather than the first operating position 70A) When the switching lever 54 is moved in the direction 74 from the pulled-out state to the retracted state in the operation range 73 of the operation position 70B side and the first operation position 70A side of the second operation position 70B, the switching lever 54 The switch lever 54 is prevented from moving by protruding from the opening 64 and coming into contact with the contact member 49 (second portion 49b). Therefore, when the switching lever 54 is in the position between the first operating position 70A and the second operating position 70B, the switching lever 54 is not in the retracted state and the lid member 65 cannot be closed. In other words, the switching lever 54 cannot be accommodated in the cover member 37 and the lid member 65 cannot be closed while the operation pattern is being switched, so that the operator can be made to recognize that the operation pattern is being switched.

14 and 15 show another embodiment of the pattern switching device 41. FIG.

The essential difference of the pattern switching device 41 of this other embodiment from the above-described embodiment is that the switching lever 54 is detachable from the switching lever support portion 53b. The configuration is similar to that of the above embodiment.

Specifically, the switching lever support portion 53b is formed in a rectangular block shape, and a screw hole 75 (a hole with a female thread cut on the inner peripheral surface) is formed in the switching lever support portion 53b. A male threaded portion 76 (a portion where a male thread is cut on the outer peripheral surface) is formed on the tip side of the switching lever 54 . By screwing the male screw portion 76 into the screw hole 75, the switching lever 54 can be attached to the switching lever support portion 53b. The switching lever 54 protrudes from the opening 64 when the switching lever 54 is attached to the switching lever support portion 53b. Further, by rotating the switching lever 54 in the screw loosening direction, the switching lever 54 can be removed from the switching lever support portion 53b, and the opening 64 can be closed by the cover member 65. FIG. In this case, for example, a holding portion that holds the switching lever 54 is provided on the cover member 37 or the like.

The working machine 1 of this embodiment is equipped with a plurality of hydraulic actuators (swing motor M1, boom cylinder 15, arm cylinder 16, bucket cylinder 17). a control table 20 erected on the airframe 2 in front of the driver's seat 5; a control member 31 for operating a plurality of hydraulic actuators; and a pattern switching device 41 for switching to an operation pattern.

According to this configuration, it is possible to secure a place for arranging the pattern switching device 41 even if the work machine 1 is small.

The work machine 1 also includes a traveling device 3 that supports the machine body 2 so as to be able to travel, and a traveling lever 22 that is provided substantially in the center of the upper portion of the operation table 20 in the width direction of the machine body and that operates the traveling device 3. The operation platform 20 includes a support frame 36 attached to the machine body 2, a cover member 37 covering the support frame 36, and a travel lever support portion 38 provided on the upper portion of the support frame 36 and supporting the travel lever 22. The switching device placement portion 46 is provided on the side of the travel lever support portion 38 in the vehicle body width direction inside the cover member 37 and on the upper portion of the support frame 36 .

According to this configuration, it is possible to secure a place for the pattern switching device 41 inside the operation console 20 .

The work machine 1 also includes a control valve 23 including a plurality of control valves (the swing control valve V2, the arm control valve V3, the bucket control valve V9, and the boom control valve V10) that control the plurality of hydraulic actuators. , the support frame 36 has a first side plate 36A and a second side plate 36B that are opposed to each other with a gap in the width direction of the vehicle body, and a connecting plate 36C that connects the upper portions of the first side plate 36A and the second side plate 36B. The control valve 23 is arranged below the connecting plate 36C and between the first side plate 36A and the second side plate 36B. The switching device arrangement portion 46 is provided between the travel lever support portion 38 and the first side plate 36A or the second side plate 36B on the connecting plate 36C.

With this configuration, it is easy to route the hydraulic hose that connects the pattern switching device 41 and the control valve.

Further, the operation table 20 has an opening 64 formed in the cover member 37 at a position corresponding to the pattern switching device 41, and a lid member 65 for opening and closing the opening 64. The pattern switching device 41 includes an operation pattern and a second operation pattern that is an operation pattern different from the first operation pattern. A switching lever 54 capable of swinging operation is provided at a second operating position 70B for switching to the operation pattern, and the switching lever 54 protrudes from the opening 64 at each of the first operating position 70A and the second operating position 70B. It can be moved between a pulled-out state (first pulled-out state 71A, second pulled-out state 71B) and a stored state (first stored state 72A, second stored state 72B) in which the lid member 65 is accommodated.

According to this configuration, the pattern switching device 41 arranged on the cover member 37 can be easily operated, and after switching the operation pattern, the switching lever 54 can be prevented from becoming an obstacle.

Further, the work machine 1 is equipped with a plurality of hydraulic actuators (swing motor M1, boom cylinder 15, arm cylinder 16, bucket cylinder 17). A member 37, an operation member 31 for operating a plurality of hydraulic actuators, and a pattern switching device 41 for switching the operation pattern of the plurality of hydraulic actuators of the operation member 31 to a plurality of operation patterns, which are housed inside the cover member 37. The cover member 37 has an opening 64 formed at a position corresponding to the pattern switching device 41, and a lid member 65 for opening and closing the opening 64, and a plurality of operation patterns. includes a first operation pattern and a second operation pattern, and the pattern switching device 41 has a first operation position 70A for switching the operation pattern to the first operation pattern and a second operation position 70A for switching the operation pattern to the second operation pattern. 70B has a switching lever 54 that can be swung, and the switching lever 54 protrudes from the opening 64 at each of the first operating position 70A and the second operating position 70B (first pulled-out state 71A). , second pulled-out state 71B) and a stored state (first stored state 72A, second stored state 72B) in which the lid member 65 is accommodated.

Further, when the work machine 1 moves the switching lever 54 in the direction 74 toward the retracted state from the pulled-out state in the operating range 73 between the first operating position 70A and the second operating position 70B, the switching lever A contact member 49 is provided to prevent movement of the switching lever 54 by making contact with the switching lever 54 protruding from the opening 64 .

According to this configuration, the switching lever 54 cannot be accommodated in the cover member 37 and the lid member 65 cannot be closed while the operation pattern is being switched, so that the operator can recognize that the operation pattern is being switched. can be done.

The work machine 1 also includes a plurality of control valves that are provided corresponding to the plurality of hydraulic actuators to control the plurality of hydraulic actuators and that are pilot-operated by the control member 31 . A pattern switching valve 42 that switches the operation pattern by switching the direction of the flow of pilot oil that pilot-operates the control valve by using A rocking arm 53 that is rotatably supported and has a switching lever support portion 53b that supports the switching lever 54 so as to be movable between the drawn state and the retracted state, and the rocking arm 53 and the valve body 42b of the pattern switching valve 42. It has an interlocking mechanism 55 for interlocking and connecting.

According to this configuration, the operating mechanism for operating the pattern switching valve 42 can be configured simply.

Although one embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

2 fuselage 3 travel device 5 driver's seat 15 hydraulic actuator (boom cylinder)
16 hydraulic actuator (arm cylinder)
17 hydraulic actuator (bucket cylinder)
20 Operation platform 22 Travel lever 23 Control valve 31 Manipulation member 36 Support frame 36A First side plate 36B Second side plate 36C Connection plate 37 Cover member 38 Travel lever support portion 41 Pattern switching device 42 Pattern switching valve 42b Valve body 46 Switching device placement portion 49 contact member 52 pivot shaft 53 swing arm 53b switching lever support 54 switching lever 55 interlocking mechanism 64 opening 65 lid member 70A first operating position 70B second operating position 71A drawn state (first drawn state)
71B drawn state (second drawn state)
72A storage state (first storage state)
72B storage state (second storage state)
73 Operation range 74 Direction M1 Hydraulic actuator (turning motor)
V2 control valve (turning control valve)
V3 control valve (arm control valve)
V9 control valve (bucket control valve)
V10 control valve (boom control valve)

Claims

A working machine equipped with a plurality of hydraulic actuators,
Airframe and
a driver's seat mounted on the aircraft;
a control console erected in front of the driver's seat;
a steering member that operates the plurality of hydraulic actuators;
a pattern switching device that switches an operation pattern for the plurality of hydraulic actuators of the steering member to a plurality of operation patterns;
with
The work machine, wherein the operating console has a switching device arrangement section in which the pattern switching device is arranged.
a running device that supports the body so that it can run;
a travel lever that is provided at a substantially central portion in the width direction of the machine body on the upper portion of the operation table and that operates the travel device;
with
The operation platform has a support frame attached to the machine body, a cover member covering the support frame, and a travel lever support section provided on the upper part of the support frame and supporting the travel lever,
The working machine according to claim 1, wherein the switching device placement portion is provided inside the cover member on a side of the traveling lever support portion in the machine body width direction and on an upper portion of the support frame.
A control valve including a plurality of control valves for controlling the plurality of hydraulic actuators;
The support frame has a first side plate and a second side plate facing each other with a gap in the width direction of the fuselage, and a connecting plate connecting the upper portions of the first side plate and the second side plate,
The control valve is arranged below the connecting plate and between the first side plate and the second side plate,
The travel lever support portion is provided at a substantially central portion in the width direction of the vehicle body on the connection plate,
The working machine according to claim 2, wherein the switching device arrangement portion is provided between the travel lever support portion and the first side plate or the second side plate on the connecting plate.
The operating table has an opening formed in the cover member at a position corresponding to the pattern switching device, and a lid member for opening and closing the opening,
The plurality of operation patterns includes a first operation pattern and a second operation pattern that is an operation pattern different from the first operation pattern,
The pattern switching device has a switching lever capable of swinging between a first operation position for switching the operation pattern to the first operation pattern and a second operation position for switching the operation pattern to the second operation pattern. ,
3. The switching lever is movable between a drawn-out state projecting from the opening and a retracted state accommodated inside the lid member at each of the first operating position and the second operating position. 3. The working machine according to 3.
A working machine equipped with a plurality of hydraulic actuators,
Airframe and
a cover member mounted on the airframe;
a steering member that operates the plurality of hydraulic actuators;
a pattern switching device for switching an operation pattern of the plurality of hydraulic actuators of the steering member to a plurality of operation patterns, the pattern switching device being accommodated inside the cover member;
with
The cover member has an opening formed at a position corresponding to the pattern switching device, and a lid member for opening and closing the opening,
The plurality of operation patterns includes a first operation pattern and a second operation pattern,
The pattern switching device has a switching lever capable of swinging between a first operation position for switching the operation pattern to the first operation pattern and a second operation position for switching the operation pattern to the second operation pattern. ,
The working machine, wherein the switching lever is movable between a drawn state in which it projects from the opening and a stored state in which it is housed inside the lid member at each of the first operating position and the second operating position.
The switching lever protrudes from the opening when the switching lever is moved in the direction from the drawn state to the retracted state in the operating range between the first operating position and the second operating position. 6. The working machine according to claim 4, further comprising an abutting member that abuts against the switching lever to prevent the movement of the switching lever.
a plurality of control valves associated with the plurality of hydraulic actuators for controlling the plurality of hydraulic actuators and pilot operated by the steering member;
The pattern switching device is
a pattern switching valve that switches the operation pattern by switching a flow direction of pilot oil for pilot-operating the control valve by the operation member;
a rotating support shaft serving as a swinging fulcrum of the switching lever;
a rocking arm that is rotatably supported around the rotating support shaft and has a switching lever support portion that supports the switching lever movably between the pulled-out state and the retracted state;
The working machine according to any one of claims 4 to 6, further comprising an interlocking mechanism that interlocks the swing arm and the valve body of the pattern switching valve.