Manipulation mechanism and working machine

Abstract

In order to provide a manipulation mechanism capable of effectively utilizing a space below, the manipulation mechanism includes a rotation shaft (134) that is rotatable about an axis extending in a first horizontal direction (138), an operation member (80) that is disposed on one end side of the axis of the rotation shaft (134) and is rotatable integrally with the rotation shaft (134), an angle sensor (132) that is disposed on the other end side of the axis of the rotation shaft (134) and detects a rotation angle of the rotation shaft (134), and a neutral return mechanism (136) that returns the operation member (80) from an operated operation position to a neutral position and is provided between the operation member (80) and the angle sensor (132).

Description

Technical Field

[0001] This invention relates to a control mechanism and a work machine. Background Technology

[0002] Previously, the operating mechanism disclosed in Patent Document 1 and the operating machine disclosed in Patent Documents 2 and 3 were known.

[0003] The operating mechanism disclosed in Patent Document 1 includes: a rotating shaft that can rotate about an axis extending in the horizontal direction; and an operating member (bulldozer lever) disposed at one end of the rotating shaft in the axial direction and rotating integrally with the rotating shaft.

[0004] The work machine disclosed in Patent Document 2 has a control panel mounted in front of the driver's seat of the machine body. The control panel is equipped with a control component for holding and operating.

[0005] Patent Document 3 discloses a work machine having a body equipped with a driver's seat. A control panel is provided to the side of the driver's seat, and this control panel includes a control member for operating a hydraulic actuator mounted on the work machine and an unloading lever. The unloading lever is configured to switch between a first posture that hinders the driver from getting in and out of the driver's seat and a second posture that allows the driver to get in and out of the driver's seat. In the first posture, movement of the object being operated by the control member is permitted; in the second posture, movement of the object being operated is prevented.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Publication No. 2007-239304

[0009] Patent Document 2: Japanese Patent Publication No. 2007-126898

[0010] Patent Document 3: Japanese Patent Publication No. 2019-116753 Summary of the Invention

[0011] The problem that the invention aims to solve

[0012] In conventional operating mechanisms, a control valve operated by an actuating member is located below the rotating shaft, and the control valve and the rotating shaft are linked by a linkage mechanism. Therefore, conventional operating mechanisms are relatively long in the vertical direction. This results in the ineffective utilization of the space beneath the operating mechanism.

[0013] However, if a driver operates the control components for an extended period with their arms outstretched forward, fatigue will occur. In this case, it is considered to install an armrest extending from the control panel side towards the driver's seat side on the control panel. If an operating component different from the control component is installed on the side of the armrest of the control panel with the armrest, and the operating support mechanism supporting the operating component is located below the armrest, there is a problem that the driver's knees and thighs may hit the operating support mechanism.

[0014] Furthermore, in the past, when handrails were installed on the control panel, they were separate from the unloading lever. This resulted in increased structural complexity and higher costs.

[0015] The present invention addresses the aforementioned problems and aims to provide an operating mechanism that can effectively utilize the space below and a work machine equipped with the operating mechanism.

[0016] In addition, the purpose of this invention is to prevent the operating support mechanism that supports the operating components from protruding, which is located below the armrest of the control panel.

[0017] In addition, the present invention aims to provide a work machine that can simplify the structure and reduce costs by providing a control panel with a function that allows and prevents the movement of the work object operated by the control member and a handrail.

[0018] Technical solutions for solving the problem

[0019] One aspect of the present invention relates to an operating mechanism comprising: a rotation shaft rotatable about an axis extending in a first horizontal direction; an operating member disposed at one end of the rotation shaft in the axial direction and rotating integrally with the rotation shaft; an angle sensor disposed at the other end of the rotation shaft in the axial direction and detecting the rotation angle of the rotation shaft; and a neutral return mechanism that returns the operating member from an operating position to a neutral position and is disposed between the operating member and the angle sensor.

[0020] Additionally, the neutral return mechanism includes: a linkage shaft disposed above the rotation shaft along a second horizontal direction intersecting the first horizontal direction; a linkage arm pivotally connected to one end of the linkage shaft and projecting upwards onto the rotation shaft; and a neutral return spring formed by a helical spring externally embedded in the other end of the linkage shaft, which applies force to the linkage shaft in order to return the operating member to the neutral position.

[0021] Additionally, the neutral return mechanism has a support frame disposed above the rotating shaft and pivotally supports a housing member that houses the other end of the linkage shaft and the neutral return spring.

[0022] Additionally, a swing limiting mechanism is provided, which limits the amount of operation of the operating member from the neutral position, and is arranged between the operating member and the angle sensor along the rotation axis with the neutral return mechanism.

[0023] Additionally, the swing limiting mechanism includes: a support plate that protrudes from the rotation axis on the second horizontal direction side; a limiting shaft that is mounted on the support plate; and an abutment member that is disposed above the rotation axis and abuts the limiting shaft at the operating position after the operating member is operated from the neutral position to limit the swing of the operating member.

[0024] Additionally, the support plate includes: a first support plate protruding from one side of the rotation axis in the second horizontal direction; and a second support plate protruding from the other side of the rotation axis in the second horizontal direction. The limiting shaft has: a first limiting shaft mounted on the first support plate and abutting against the abutting member when the operating member is operated from a neutral position to one side; and a second limiting shaft mounted on the second support plate and abutting against the abutting member when the operating member is operated from a neutral position to the other side. The first limiting shaft and the second limiting shaft are mounted in a manner that allows them to move forward and backward relative to the abutting member.

[0025] Additionally, the abutting member has: a first limiting portion for the first limiting shaft to abut; and a second limiting portion for the second limiting shaft to abut, wherein the first limiting portion and the second limiting portion are recessed upward from the lower surface of the abutting member.

[0026] In addition, one embodiment of the present invention relates to a machine that includes the aforementioned operating mechanism.

[0027] Additionally, the work machine includes: a body; a driver's seat mounted on the body; a control panel disposed in front of the driver's seat; an operating member capable of swinging operation disposed on the control panel; and an operating support mechanism supporting the operating member. The control panel includes a hollow handrail extending rearward from the side of the control panel. The operating support mechanism has the neutral return mechanism and a swing limiting mechanism that limits the amount of operation of the operating member from the neutral position. The operating support mechanism is housed within the hollow interior of the handrail.

[0028] In addition, the work machine according to other embodiments of the present invention includes: a body; a driver's seat mounted on the body; a control panel disposed in front of the driver's seat; an operating member capable of swinging operation disposed on the control panel; and an operating support mechanism supporting the operating member. The control panel includes a hollow handrail extending rearward from the side of the control panel. The operating support mechanism has a neutral return mechanism for returning the operating member from an operating position to a neutral position, and a swing limiting mechanism for limiting the amount of operation of the operating member from the neutral position. The operating support mechanism is housed within the hollow interior of the handrail.

[0029] Additionally, the operating support mechanism includes: a rotating shaft that rotates about a center of gravity by the swinging operation of the operating member; and a shaft support member that supports the rotating shaft in a manner that allows it to rotate about a center of gravity. The rotating shaft is disposed below the upper wall of the handrail and protrudes laterally from one end of the handrail in the width direction of the body.

[0030] Additionally, the neutral return mechanism includes: a spring device disposed between the upper wall and the rotation shaft, and having a neutral return spring for returning the operating member to the neutral position; and a bracket member supporting the spring device and mounted on the upper wall, wherein a bracket mounting portion on the upper wall for mounting the bracket member is recessed from below upward.

[0031] In addition, the swing limiting mechanism and the neutral return mechanism are arranged along the rotation axis.

[0032] Additionally, the swing limiting mechanism includes: a support plate fixed to the rotation axis; an abutment member opposite to the support plate; and a limiting shaft mounted on the support plate in a manner that allows it to move forward and backward relative to the abutment member, thereby limiting the swing of the operating member by abutting against the abutment member when the operating member swings from the neutral position.

[0033] Additionally, the support plate includes: a first support plate protruding from the front side of the rotation axis; and a second support plate protruding from the rear side of the rotation axis. The limiting shaft includes: a first limiting shaft mounted on the first support plate; and a second limiting shaft mounted on the second support plate. The abutting member is disposed above the rotation axis and has: a first limiting portion abutting the first limiting shaft when the operating member is operated from the neutral position to one side; and a second limiting portion abutting the second limiting shaft when the operating member is operated from the neutral position to the other side. The first limiting portion and the second limiting portion are formed by recessing upward from the lower surface of the abutting member.

[0034] Additionally, the control panel includes: a base erected on the machine body; and a control panel body disposed on the upper part of the base. The control panel body includes: a mounting portion mounted on the base; and an armrest having: an armrest base disposed on the side of the mounting portion; and an armrest body extending from the armrest base toward the driver's seat side. The operating member is disposed on the side of the armrest base opposite to the mounting portion, and the operating support mechanism is housed in the armrest base.

[0035] In addition, an angle sensor is provided, which detects the operating direction and operating amount of the operating member, and the angle sensor is housed in the mounting part.

[0036] Alternatively, the armrest can be configured such that it extends rearward from one end of the control panel in the width direction of the panel, the control panel including: a control member mounted on the control panel and operated by the driver; and a flip-up armrest extending rearward from the other end of the control panel in the width direction of the panel, the flip-up armrest being configured to switch between a first posture that hinders the driver from getting in and out of the driver's seat and a second posture that allows the driver to get in and out of the driver's seat, in the first posture allowing the movement of the object operated by the control member, and in the second posture preventing the movement of the object.

[0037] Furthermore, the work machine described in another further aspect of the present invention includes: a body; a driver's seat mounted on the body; and a control panel disposed in front of the driver's seat on the body, and equipped with a control member for holding and operating. The control panel includes an upward-folding armrest extending rearward from the side of the control panel. The upward-folding armrest is configured to switch between a first posture that hinders the driver from getting in and out of the driver's seat and a second posture that allows the driver to get in and out of the driver's seat. In the first posture, the movement of the object to be operated by the control member is allowed, and in the second posture, the movement of the object to be operated is prevented.

[0038] Additionally, the control panel includes: a base erected on the machine body; and a control panel body disposed on the upper part of the base, the control panel body including: a mounting part mounted on the base; and the flip-up armrest, the flip-up armrest including: an armrest base disposed on the side of the mounting part; and an armrest body pivotally supported on the armrest base, the armrest body being able to change position between a descending position extending rearward from the armrest base to form the first posture, and an ascending position rotating from the descending position to the upper side to form the second posture.

[0039] In addition, a detection switch is provided to detect the position of the armrest body.

[0040] Additionally, a damper is provided, which is disposed on one side of the handrail base or the handrail body, and mitigates the impact when the handrail body rotates from the rising position to the falling position by abutting against the other side of the handrail base or the handrail body.

[0041] In addition, it has a retaining mechanism that holds the handrail body in the lowered position and the raised position.

[0042] Additionally, the armrest includes: a fixed side member mounted on the base of the armrest; and a shaft supported on the fixed side member and rotating integrally with the armrest body. The fixed side member has a first support portion supporting one end of the shaft in the axial direction and a second support portion supporting the other end of the shaft in the axial direction. The retaining mechanism is assembled between the first support portion and the second support portion.

[0043] Additionally, the retaining mechanism includes: a first member mounted on the fixed side member; a second member rotatably supported on the shaft and slidably in the axial direction; and a spring member that presses the second member against the first member.

[0044] Additionally, the retaining mechanism includes: a cam protrusion disposed on one side of the first member or the second member; and a cam ramp disposed on the other side of the first member or the second member and abutting against the cam protrusion. The cam protrusion and the cam ramp abut against each other, thereby causing the force of the spring member to be applied in such a way that the armrest body rotates to the lower position from the midpoint between the lower position and the upper position on the lower position side and rotates to the upper position from the midpoint on the upper position side.

[0045] In addition, when the handrail body is in the raised position, the retaining mechanism abuts against the cam inclined surface through the cam protrusion, so that the force of the spring member acts in the direction that rotates the handrail body from the lowered position to the raised position.

[0046] Additionally, it includes: a damper disposed on one side of the handrail base or the handrail body, which mitigates the impact when the handrail body rotates from the raised position to the lowered position by abutting against the other side of the handrail base or the handrail body; and a movable side member that rotates integrally with the shaft and is mounted on the handrail body, the damper being disposed on the handrail base, and the movable side member having a damper abutting portion that abuts against the damper.

[0047] Invention Effects

[0048] Based on the above structure, the thickness of the operating mechanism in the vertical direction can be reduced. This allows for effective utilization of the space below the operating mechanism.

[0049] Furthermore, according to the aforementioned work machine, the handrail is formed into a hollow shape, and an operating support mechanism equipped with a neutral return mechanism and a swing limiting mechanism is housed inside the hollow of the handrail, thereby preventing the operating support mechanism that supports the operating components from protruding downwards from the handrail.

[0050] Furthermore, according to the aforementioned work machine, by enabling the handrail to both allow and prevent the movement of the object being operated by the control member, structural simplification and cost reduction can be achieved. Attached Figure Description

[0051] Figure 1 This is a top view of the machine.

[0052] Figure 2 This is a side view of the machine.

[0053] Figure 3 This is a side view of the driver's cab.

[0054] Figure 4 It is a 3D view of the driver's compartment.

[0055] Figure 5 It is a 3D view of the main body of the control panel.

[0056] Figure 6 This is an exploded 3D view of the control panel.

[0057] Figure 7 This is a three-dimensional view of the first structure from below.

[0058] Figure 8 This is a three-dimensional view of the main body of the control panel from below.

[0059] Figure 9 This is a side view of the driver's side.

[0060] Figure 10 This is a bottom view of the hinge mechanism.

[0061] Figure 11 This is an exploded 3D view of the first handrail.

[0062] Figure 12 This is a three-dimensional view of the hinge mechanism viewed from above.

[0063] Figure 13 This is a diagram of the core material and the movable side components.

[0064] Figure 14 It is a three-dimensional diagram showing the state of contact between the movable side member and the damper.

[0065] Figure 15 It is a three-dimensional diagram showing the state of contact between the movable side member and the abutting member.

[0066] Figure 16 This is a three-dimensional view of the first cam.

[0067] Figure 17 This is a top view of the second cam.

[0068] Figure 18 This is a three-dimensional view showing the first and second cams at the descending position.

[0069] Figure 19 This is a three-dimensional diagram showing the first and second cams at the rising position.

[0070] Figure 20 This is a bottom view of the interior of the second handrail from below.

[0071] Figure 21 This is a sectional view of the rear of the support structure for the bulldozer control lever.

[0072] Figure 22 This is a 3D view of the support structure for the bulldozer control lever.

[0073] Figure 23 It is a three-dimensional diagram showing a portion of the support structure of the bulldozer control lever.

[0074] Figure 24 This is a right-side view of the support portion of the rotating shaft.

[0075] Figure 25 This is the right-side view of the neutral return mechanism.

[0076] Figure 26 This is the right-side view of the swing limiting mechanism.

[0077] Figure 27 This is a right-side view of the driver's side. Detailed Implementation

[0078] Hereinafter, one embodiment of the present invention will be described with appropriate reference to the accompanying drawings.

[0079] Figure 1 This is a schematic top view showing the overall structure of the work machine 1 according to this embodiment. Figure 2 This is a schematic side view of the work machine 1. In this embodiment, the work machine 1 is exemplified as a backhoe excavator, which is a rotary work machine.

[0080] like Figure 1 , Figure 2As shown, the work machine 1 includes a body (turntable) 2, a traveling device 3, and a working device 4. A driver's cab 5 is mounted on the body 2. Inside the driver's cab 5 is a driver's seat 6 for the driver (operator). In other words, the driver's seat 6 is mounted on the body 2, and the driver's cab 5 surrounds the driver's seat 6. The driver's seat 6 has a seat 6A for the driver to sit on and a backrest 6B for supporting the driver's back.

[0081] In this embodiment, the direction is towards the front of the driver (operator) seated in the driver's seat 6 of the machine 1. Figure 1 , Figure 2 Arrow A1 direction) is the direction forward, towards the rear of the driver ( Figure 1 , Figure 2 (Arrow A2 direction) as the rear, Figure 1 , Figure 2 Arrow K1 points in the forward / backward direction, towards the driver's left side ( Figure 1 (Arrow B1 direction) as the left, and the driver's right side ( Figure 1 The arrow B2 direction is used to illustrate the right side.

[0082] In addition, such as Figure 1 As shown, the horizontal direction, orthogonal to the front-back direction K1, will be described as the width direction K2 (the width direction of the body 2). The direction from the center of the body 2's width direction towards the right or left will be described as the outer side (outer side of the width direction K2). In other words, the outer side refers to the direction in the width direction K2 that is away from the center of the body 2's width direction. The direction opposite to the outer side will be described as the inner side (inner side of the width direction K2). In other words, the inner side refers to the direction in the width direction K2 that is close to the center of the body 2's width direction.

[0083] like Figure 1 , Figure 2 As shown, the traveling device 3 is a tracked traveling device that supports the machine body 2 in a drivable manner. It has a traveling frame 3A, a first traveling device 3L located on the left side of the traveling frame 3A, and a second traveling device 3R located on the right side of the traveling frame 3A. The first traveling device 3L is driven by a first traveling motor M1, and the second traveling device 3R is driven by a second traveling motor M2. The first traveling motor M1 and the second traveling motor M2 are composed of hydraulic motors (hydraulic actuators).

[0084] like Figure 2As shown, a bulldozing device 7 is mounted at the front of the traveling frame 3. The bulldozing device 7 has a bulldozing arm 7A, the rear of which is pivotally supported on the traveling frame 3A and is capable of swinging in the vertical direction; and a bulldozing blade 7B disposed at the front of the bulldozing arm 7A. The bulldozing device 7 can be raised and lowered (raising and lowering the bulldozing blade 7B) by extending and retracting the bulldozing blade cylinder (hydraulic actuator).

[0085] like Figure 2 As shown, the body 2 is supported on the travel frame 3A via a slewing bearing 8, allowing it to rotate around a slewing axis X1. The body 2 is driven to rotate by a slewing motor M3. The slewing motor M3 is a hydraulic motor (hydraulic actuator, hydraulic device). The body 2 has a base plate (hereinafter referred to as the slewing base plate) 9 supported on the slewing bearing 8, allowing it to rotate around a slewing axis X1. The slewing base plate 9 is formed of steel plate or the like and constitutes the bottom of the body 2. On the upper surface of the slewing base plate 9, longitudinal ribs 9A are provided from the front to the rear as reinforcing members. In addition, in addition to the longitudinal ribs 9A, support members are also provided on the slewing base plate 9 to support equipment or other loads mounted on the body 2, thus forming a slewing frame that serves as the skeleton of the body 2. The horizontal perimeter of the slewing frame is covered by a slewing cover 12.

[0086] like Figure 1 , Figure 2 As shown, a counterweight 10 is provided at the rear of the machine body 2. In front of the counterweight 10, along the width direction K2 of the machine body, a fuel tank T1 for storing fuel for the prime mover E1 and a working oil tank T2 for storing working oil are arranged.

[0087] like Figure 1 As shown, the cockpit 5 is mounted on one side (left side) of the fuselage 2 in the width direction K2. On the other side (right side) of the fuselage 2 in the width direction K2, the prime mover E1 is mounted. The prime mover E1 is a diesel engine. Alternatively, the prime mover E1 can be a gasoline engine, an LPG engine, or an electric motor, or it can be a hybrid type with both an engine and an electric motor.

[0088] A hydraulic pump P1 is installed at the rear of the prime mover E1. Driven by the prime mover E1, the hydraulic pump P1 pressurizes and discharges the working oil used in the hydraulic drive unit. The hydraulic drive unit is, for example, a hydraulic actuator installed on the working machine 1. At the front of the prime mover E1, a cooler R1 for cooling the cooling water of the prime mover E1, an oil cooler O1 for cooling the working oil, and a condenser D1 for cooling the refrigerant of the air conditioning unit (air conditioner) installed on the working machine 1 are arranged.

[0089] like Figure 1As shown, a control device U1 is installed below the driver's cab 5. The control device U1 is configured, for example, using a microcomputer equipped with a CPU (Central Processing Unit) and EEPROM (Electrically Erasable Programmable Read-Only Memory).

[0090] A rotary joint (hydraulic device) S1 is provided at the position of the slewing axis X1. The rotary joint S1 is a hydraulic device that allows working oil to flow between the hydraulic devices on the machine body 2 side and the hydraulic devices on the travel device 3 side. A control valve (hydraulic device) V1 is arranged behind the rotary joint S1. The control valve V1 is a hydraulic device that integrates control valves for controlling hydraulic actuators such as hydraulic cylinders and hydraulic motors equipped on the work machine 1. The control valve constituting the control valve V1 is a switching valve that switches the direction of working oil relative to the hydraulic actuator. It is a control valve electrically controlled by the control device U1, for example, a solenoid valve. The control valve constituting the control valve V1 is, for example, a control valve that controls hydraulic accessories such as the first travel motor M1, the second travel motor M2, the slewing motor M3, the bulldozer cylinder, the swing cylinder C2, the boom cylinder C3, the stick cylinder C4, the bucket cylinder C5, the bucket 24, or those mounted on them.

[0091] like Figure 1 , Figure 2 As shown, at the front of the support bracket 20 (the part protruding from the body 2), the swing bracket 21 is mounted via the swing shaft 26 in a manner that allows it to swing about the longitudinal axis. The working device 4 is mounted on the swing bracket 21.

[0092] like Figure 2 As shown, the working device 4 includes a boom 22, a stick 23, and a bucket (working tool) 24. The base 22A of the boom 22 is pivotally mounted on the upper part of the swing bracket 21 via a boom pivot 27 in a manner that allows it to rotate about a horizontal axis (an axis extending along the width direction K2 of the machine body). Thus, the boom 22 can swing in the vertical direction.

[0093] The stick 23 is pivotally mounted to the front end of the boom 22 in a manner that allows it to rotate about a horizontal axis. This allows the stick 23 to swing back and forth or up and down. The bucket 24 is positioned at the front end of the stick 23 to perform both digging and dumping actions. The digging action refers to the action of swinging the bucket 24 towards the boom 22, for example, when digging up soil or sand. The dumping action refers to the action of swinging the bucket 24 away from the boom 22, for example, when dropping (discharging) the dug-up soil or sand.

[0094] The work machine 1 can replace the bucket 24, or, based on the bucket 24, can be equipped with other work tools (hydraulic attachments) that can be driven by hydraulic actuators. Examples of other work tools include hydraulic breakers, hydraulic crushers, angled brooms, grounding augers, pallet forks, sweepers, lawnmowers, snowplows, etc.

[0095] The swing bracket 21 can swing by extending and retracting the swing cylinder C2 located on the machine body 2. The boom 22 can swing by extending and retracting the boom cylinder C3. The stick 23 can swing by extending and retracting the stick cylinder C4. The bucket 24 can perform digging and dumping actions by extending and retracting the bucket (working tool cylinder) C5. The swing cylinder C2, boom cylinder C3, stick cylinder C4, and bucket cylinder C5 are composed of hydraulic cylinders (hydraulic actuators).

[0096] like Figure 1 , Figure 3 As shown, a door 53 is provided on the side (left side) of the cab 5. The rear of the door 53 is supported by a hinge 61 that allows it to rotate about a longitudinal axis. By rotating about the hinge 61, the front of the door moves outward in the width direction K2 of the aircraft body to open and close the passenger / alighting opening 62. The passenger / alighting opening 62 is an opening for the driver to board and alight relative to the cab 5 (driver's seat 6).

[0097] like Figure 3 As shown, the driver's seat 6 is supported by a seat platform 76 and the like on the floor portion 5B that forms the bottom of the cab 5. The driver's seat 6 is located at the center of the cab 5 in the width direction K2. The seat platform 76 is mounted on the floor portion 5B and at the center of the cab 5 in the width direction K2. A suspension device 77 is provided on the seat platform 76, and the driver's seat 6 is mounted on the suspension device 77 in a manner that allows for adjustment of its fore-and-aft position via a slide rail 78.

[0098] An air conditioning unit 63 is installed inside the seat 76. The air conditioning unit 63 has an evaporator and a blower fan. Air conditioning air blown out from the air conditioning unit 63 is guided through a duct 66A located at the bottom of the cab 5 to a duct 66B located at the front of the cab 5, and blown out from an outlet located at the top of the duct 66B toward the windshield of the cab 5.

[0099] Inside the cab 5, a control device 41 is installed. The control device 41 is located in front of the driver's seat 6. The driver's seat 6 and the control device 41 constitute the driving section 42 of the operating machine 1 (including the control body 2, the traveling device 3, the working device 4, the swing bracket 21, etc.). In this embodiment, the structure (cab specification) in which the driving section 42 is arranged inside the cab 5 is described, but it is not limited to this. It may also be a structure in which the driving section 42 is open to the outside in the front-rear direction K1 and the width direction K2 of the machine body, and is covered by a roof (top cover specification). It may also be a structure in which the driving section 42 is open to the outside in the front-rear direction K1, the width direction K2 of the machine body, and the top.

[0100] like Figure 3 , Figure 4 As shown, the control device 41 includes a control panel 81, a control component 82, a monitor 84, a driving operation component 85, and a control lever (operation component) 80.

[0101] like Figure 4 As shown, the control panel 81 is located in front of the pilot's seat 6 on the fuselage 2. Furthermore, the control panel 81 is positioned at the center of the cockpit 5 in the width direction K2. In other words, the control panel 81 is positioned such that the center of the cockpit 5 in the width direction K2 is approximately aligned with the center of the cockpit 5 in the width direction K2. The control panel 81 includes: a base 86 erected on the floor 5B (fuselage 2); and a control panel body 87 disposed on the upper part of the base 86.

[0102] like Figure 4 , Figure 5 As shown, the control component 82 is the component that the driver holds and operates. The control component 82 is mounted on the control panel body 87 (control panel 81). The control component 82 includes a first control handle 82L and a second control handle 82R. The first control handle 82L is located on one side (left side) of the control panel body 87 in the width direction K2. The second control handle 82R is located on the other side (right side) of the control panel body 87 in the width direction K2 and is arranged side by side with the first control handle 82L in the width direction K2.

[0103] like Figure 4 , Figure 5As shown, both the first control handle 82L and the second control handle 82R are devices capable of operating two objects equipped on the work machine 1. For example, the first control handle 82L can rotate the machine body 2 (the first object) and swing the boom 23 (the second object). Similarly, the second control handle 82R can swing the bucket 24 (the first object) and the boom 22 (the second object). The operating direction and swing amount of the control components 82 are detected by an angle sensor. The detection signal from the angle sensor is sent to the control device U1. The control device U1 controls the control valve that controls the objects based on the detection signal from the angle sensor.

[0104] like Figure 4 , Figure 5 As shown, the monitor 84 is positioned at the center of the upper surface of the control panel body 87 in the width direction K2 (between the first control handle 82L and the second control handle 82R), in front of the operator who is holding the first control handle 82L and the second control handle 82R and operating the work machine 1 in a forward-leaning posture. The monitor 84 has a display section (screen) 84A on its rear surface for displaying information. The display section 84A displays basic information about the work machine 1, images of the surroundings of the work machine 1, and information required for setting various parameters of the work machine 1.

[0105] On the lower side of the display section 84A of the monitor 84, there is a first switch 84B for changing the speed of the prime mover E1, a second switch 84C for setting the working speed of the machine 1, and a third switch 84D for turning on and off the lights equipped on the machine 1, such as boom lights, headlights, and taillights.

[0106] To the left of the first control handle 82L, there are multiple operation tools (first operation tool 44A, second operation tool 44B, and third operation tool 44C) for operating the items displayed on the screen. The first operation tool 44A is rotated to change the candidate selection item among the multiple selection items displayed on the display unit 84A. The third operation tool 44C is pressed to determine the selection item. The second operation tool 44B cancels the selection item determined by pressing.

[0107] like Figure 4As shown, the driving operation component 85 is disposed on the floor portion 5B. The driving operation component 85 is disposed to the left and right of the base 86 of the control panel 81. The driving operation component (referred to as the driving pedal) 85 is a pedal operated by foot pedal to control the driving device 3. The left driving pedal 85 operates the first driving device 3L (first driving motor M1), and the right driving pedal 85 operates the second driving device 3R (second driving motor M2). The amount and direction of pedal application are detected by an angle sensor. The detection signal from the angle sensor is sent to the control device U1, which controls the control valves that control the driving motors M1 and M2 based on the detection signal from the angle sensor.

[0108] The control lever 80 is the bulldozing control lever for operating the bulldozing device 7.

[0109] Furthermore, the driver's unit 42 is equipped with a swing operation component (e.g., a seesaw switch (not shown) located on the upper part of the first operating handle 82L or the second operating handle 82R) for swinging the swing bracket 21. The operation amount and direction of the swing operation component are also detected by an angle sensor. The detection signal from the angle sensor is sent to the control device U1, which controls the control valve that controls the swing cylinder based on the detection signal from the angle sensor.

[0110] like Figure 6 As shown, the base 86 has a mounting bracket 91 on its upper part for mounting the control panel body 87. (As indicated...) Figure 4 , Figure 5 As shown, the control panel body 87 has a mounting section 92 at the center of the body width direction K2, and handrails 93 located on the left and right sides of the mounting section 92. The mounting section 92 is detachably mounted to the mounting bracket 91 of the base 86. The handrail 93 located on the left side of the mounting section 92 (towards the boarding / alighting opening 62) is referred to as the first handrail (upward-folding handrail) 93L, and the handrail 93 located on the right side of the mounting section 92 is referred to as the second handrail 93R.

[0111] The first handrail 93L has a handrail base 93L1 located on the left side of the mounting portion 92, and a handrail body 93L2 pivotally supported on the rear of the handrail base 93L1. The second handrail 93R has a handrail base 93R1 located on the right side of the mounting portion 92, and a handrail body 93R2 integrally formed with the handrail base 93R1.

[0112] The armrest body 93L2 extends rearward (to the driver's seat 6 side) from the armrest base 93L1. The armrest body 93R2 also extends rearward (to the driver's seat 6 side) from the armrest base 93R1. That is, the armrest 93 is provided on the control panel 81 and extends from the control panel 81 side to the driver's seat 6 side.

[0113] like Figure 9 , Figure 27 As shown, the lower surface 93a of the armrests 93 (first armrest 93L and second armrest 93R) is formed as an inclined surface that slopes upward as it moves rearward. This allows the space below the armrest 93 to widen as it moves towards the driver's seat 6. In the driver's compartment 42 of this embodiment, the driver's left foot is positioned below the first armrest 93L, and the driver's right foot is positioned below the second armrest 93R. By forming the lower surface 93a of the armrests 93 as an inclined surface that slopes upward as it moves rearward, the space for the driver's feet can be widened.

[0114] like Figure 4 , Figure 5 As shown, the armrest body 93L2 and armrest body 93R2 have an elbow rest 93A at the rear for placing the driver's elbow. The elbow rest 93A is formed, for example, by a cushioning member. The driver places his left elbow in the elbow rest 93A of the first armrest 93L and holds the first control handle 82L with his left hand, places his right elbow in the elbow rest 93A of the second armrest 93R and holds the second control handle 82R with his right hand. Thus, the driver operates the control member 82 while seated in the driver's seat 6 with his upper body in a forward-leaning posture.

[0115] like Figure 5 As shown, the main body of the control panel 87 can also be described as being composed of a first structure 87A including a mounting part 92, a handrail base 93L1 of a first handrail 93L and a second handrail 93R, and a second structure 87B including a handrail body 93L2 of the first handrail 93L.

[0116] like Figure 6 As shown, the first structure 87A has an upper body 94 and a lower body 95. (As...) Figure 7 As shown, the upper body 94 has an upper wall 96 and a peripheral wall 97 extending downward from the edge of the upper wall 96, forming a downward opening. Furthermore, the upper body 94 is integrally formed of resin from the components constituting the mounting portion 92 (referred to as the first component portion) 94A, the components constituting the armrest base 93L1 of the first armrest 93L (referred to as the second component portion) 94B, and the components constituting the second armrest 93R (referred to as the third component portion) 94C.

[0117] like Figure 6 As shown, the upper wall 96 is provided with: a first mounting part 96A for mounting the operating member 82; a second mounting part 96B for mounting the monitor 84; a third mounting part 96C for mounting the first switch 84B, the second switch 84C and the third switch 84D; and a fourth mounting part 96D for mounting the first operating tool 44A, the second operating tool 44B and the third operating tool 44C.

[0118] like Figure 7 As shown, the peripheral wall 97 has a first wall 97a to a ninth wall 97i. The first wall 97a forms the front portion of the first constituent part 94A, and the second wall 97b forms the rear portion of the first constituent part 94A. The third wall 97c forms the left side portion of the second constituent part 94B, the fourth wall 97d forms the front portion of the second constituent part 94B, and the fifth wall 97e forms the rear portion of the second constituent part 94B. The sixth wall 97f forms the left side portion of the third constituent part 94C, the seventh wall 97g forms the right side portion of the third constituent part 94C, the eighth wall 97h forms the front portion of the third constituent part 94C, and the ninth wall 97i forms the rear portion of the third constituent part 94C.

[0119] like Figure 8 As shown, the lower body 95 is a cover that closes the lower opening of the upper body 94. The inner space (lower space) of the upper body 94 is covered from below by the lower body 95, thus the first structure 87A is hollow. That is, the mounting part 92, the first armrest 93L, and the second armrest 93R are hollow.

[0120] The lower body 95 has: a first part 95A corresponding to the first constituent part 94A; a second part 95B corresponding to the second constituent part 94B; and a third part 95C corresponding to the third constituent part 94C.

[0121] like Figure 8 As shown, the first part 95A is formed as a protrusion that is lower than the lower end of the upper body 94, and also covers the mounting bracket 91 of the base 86. Figure 6 As shown, the first part 95A is integrally formed with the second part 95B and the third part 95C, and has a main part 95Aa covering the left and right sides, rear and bottom of the mounting bracket 91, and a secondary part 95Ab covering the front of the mounting bracket 91. By removing the secondary part 95Ab, the main part 95Aa (lower part 95) can be removed while the upper body 94 is mounted on the base 86.

[0122] like Figure 9 As shown, the first armrest 93L (armrest 93) is configured to switch between a first position 98 and a second position 99. The first position 98 is a position that hinders the driver from getting in and out of the driver's seat 6. Specifically, the first position 98 hinders the driver from getting in and out of the driver's seat 6 via the passageway between the driver's seat 6 and the passenger access point 62. The second position 99 is a position that allows the driver to get in and out of the driver's seat 6. Specifically, the second position 99 allows the driver to get in and out of the driver's seat 6 via the passageway between the driver's seat 6 and the passenger access point 62.

[0123] In this embodiment, the handrail body 93L2 of the first handrail 93L can, as Figure 9As shown by the solid line, the downward position 100 extends from the base of the armrest 93L1 towards the driver's seat 6, and as shown by the solid line. Figure 9 The position changes between the lowered position 100 and the rising position 101, which rotates approximately 90° upwards as shown by the double-dotted line. Furthermore, by placing the handrail body 93L2 of the first handrail 93L in the lowered position 100, a first posture 98 is formed, and by placing it in the rising position 101, a second posture 99 is formed.

[0124] In the first position 98, the movement of the operable components (boom cylinder C3, stick cylinder C4, bucket cylinder C5, and swing motor M3) operated by the control member 82 is permitted; in the second position 99, the movement of the operable components is prevented. Furthermore, the hydraulic actuators used to allow and prevent movement of the operable components by switching between the first position 98 and the second position 99 of the first handlebar 93L are not limited to the aforementioned boom cylinder C3, stick cylinder C4, bucket cylinder C5, and swing motor M3; other hydraulic actuators (first travel motor M1, second travel motor M2, swing cylinder C2, bulldozer blade cylinder, etc.) can also be added. That is, when the first handlebar 93L is in the first position 98, the movement of the hydraulic actuators mounted on the work machine 1 is easily facilitated; when the first handlebar 93L is in the second position 99, the movement of the hydraulic actuators mounted on the work machine 1 is prevented.

[0125] The term "permitting the operation of the hydraulic actuator" refers to the state where, when the component operating the hydraulic actuator is operated, the control device U1 controls the current supplied to the control valve of the target (or sends a signal to the control valve of the target), causing the hydraulic actuator to operate. Conversely, the term "preventing the operation of the hydraulic actuator" refers to the state where, even if the component operating the hydraulic actuator is operated, the control device U1 does not send a signal to the control valve of the target, and the hydraulic actuator does not operate.

[0126] The position of the handrail body 93L2 is detected by detection switch 102. For example... Figure 10 , Figure 11 As shown, the detection switch 102 is disposed on the armrest base 93L1. In detail, the detection switch 102 has a switch body 102A that is housed in the rear right side of the armrest base 93L1 and mounted on the armrest base 93L1, and a contact 102B that protrudes rearward from the armrest base 93L1.

[0127] In the position detection of the handrail body 93L2, when the handrail body 93L2 is in the lowered position 100, it is detected that the handrail body 93L2 is in the lowered position 100 by abutting (pressing) the contact member 102B. Conversely, when the handrail body 93L2 is rotated from the lowered position 100 towards the raised position 101 and moves away from the contact member 102B, it is detected that the handrail body is no longer in the lowered position 100, i.e., in the raised position 101.

[0128] The switch body 102A is connected to the control device U1. The control device U1 can obtain the detection information of the detection switch 102. When the control device U1 obtains information that the handrail body 93L2 is in the lowered position 100, it allows the operation of the hydraulic actuator mounted on the work machine 1; when it obtains information that the handrail body 93L2 is not in the lowered position 100 (in the raised position 101), it prevents the operation of the hydraulic actuator mounted on the work machine 1.

[0129] Furthermore, when the handrail body 93L2 is detected to be in the lowered position 100, the operation of the hydraulic actuator mounted on the work machine 1 can be prevented by pressing a switch, such as the second switch 84C, provided on the work machine 1.

[0130] Furthermore, when the handrail body is detected to be in the raised position 101, the restriction on the operation of the hydraulic actuator mounted on the work machine 1 can be released by pressing a switch, such as the second switch 84C, which is provided on the work machine 1, allowing the hydraulic actuator to operate.

[0131] like Figure 8 As shown, a recess 103 is formed on the lower surface side of the armrest body 93L2 of the first armrest 93L. By forming the recess 103, for example, when the armrest body is raised from the lowered position 100, fingers or the like can be hooked onto the recess 103.

[0132] like Figure 10 As shown, a hinge mechanism 105 is assembled on the first handrail 93L to rotatably support the handrail body 93L2 on the handrail base 93L1.

[0133] like Figure 10 , Figure 12 As shown, the hinge mechanism 105 has a fixed side member 104, a shaft 106, a movable side member 107, and a retaining mechanism 108.

[0134] like Figure 10 , Figure 11As shown, a rearwardly protruding portion 109 is formed at the rear of the armrest base 93L1 (second component portion 94B), and a recess 110 is formed at the front of the armrest body for the protruding portion 109 to be inserted. The hinge mechanism 105 is assembled at the junction of the rear of the armrest base 93L1 and the front of the armrest body 93L2.

[0135] like Figure 10 , Figure 12 As shown, the fixed-side member 104 is housed in the rear of the armrest base 93L1 (second component 94B). The fixed-side member 104 includes a pair of fixed hinges (first fixed hinge 104L and second fixed hinge 104R) arranged at intervals in the width direction K2 of the machine body. The first fixed hinge 104L and the second fixed hinge 104R each have a fixing portion 104A that is mounted to the armrest base 93L1 by bolts or the like, and a support portion 104B (first support portion 104B1 and second support portion 104B2) provided at the rear of the fixing portion 104A. The first support portion 104B1 is disposed on the left side within the protrusion 109, and the second support portion 104B2 is disposed on the right side within the protrusion 109. The fixing portions 104A of the first fixed hinge 104L and the second fixed hinge 104R are connected by a connecting member 111.

[0136] Shaft 106 is supported on fixed-side member 104 and rotates integrally with handrail body 93L2. Shaft 106 is freely inserted through the first support portion 104B1 and the second support portion 104B2 about its axis. That is, the first support portion 104B1 supports one end of shaft 106 in the axial direction, and the second support portion 104B2 supports the other end of shaft 106 in the axial direction. In addition, shaft 106 protrudes from the first support portion 104B1 and protrudes to the left from the protrusion 109, and protrudes from the second support portion 104B2 and protrudes to the right from the protrusion 109.

[0137] like Figure 10 , Figure 11 As shown, the movable side member 107 rotates integrally with the shaft 106 and is mounted on the armrest body 93L2. The movable side member 107 includes a pair of movable hinges (first movable hinge 107L and second movable hinge 107R) arranged at intervals in the width direction K2 of the body and mounted on the left and right sides of the front part of the armrest body 93L2. The first movable hinge 107L and the second movable hinge 107R each have: a fixing part 107A mounted on the armrest body 93L2; and a shaft mounting part 107B (first shaft mounting part 107B1 and second shaft mounting part 107B2) provided in front of the fixing part 107A.

[0138] like Figure 13As shown, the movable side member 107 (fixed part 107A) is mounted to the core material 112 formed of sheet metal via bolts or the like. The core material 112 is the core material 112 of the handrail body 93L2, such as... Figure 10 As shown, it is embedded in the handrail body 93L2. On the handrail body 93L2, an insertion portion 113 is formed for the fixing portion 107A that inserts into the movable side member 107 (see reference). Figure 10 ) and the bolt through hole 114 of the through bolt (refer to Figure 8 The fixing part 107A of the movable side member 107 (first movable hinge 107L, second movable hinge 107R) is inserted into the handrail body 93L2, and the fixing part 107A is fixed to the core material 112 by bolts inserted through the bolt insertion hole 114, thereby installing the movable side member 107 onto the core material 112.

[0139] like Figure 13 As shown, the core material 112 has an extension portion 115 extending forward from the right end of the core material 112; and an abutment portion 116 disposed at the front of the extension portion 115. When the handrail body 93L2 is in the lowered position 100, the abutment portion 116 abuts directly or via the contact member 102B of the detection switch 102.

[0140] like Figure 11 As shown, the first shaft mounting part 107B1 is disposed on the left side within the recess 110 of the handrail body 93L2, and the second shaft mounting part 107B2 is disposed on the right side within the recess 110. Figure 12 As shown, the first shaft mounting part 107B1 is integrally rotatably mounted on the left end side of the shaft 106, and the second shaft mounting part 107B2 is integrally rotatably mounted on the right end side of the shaft 106.

[0141] Furthermore, the first movable hinge 107L and the second movable hinge 107R are first assembled onto the shaft 106, and after being assembled onto the shaft 106, they are installed onto the handrail body 93L2. Figure 10 , Figure 12 As shown, a spacer 117 is sandwiched between the first support portion 104B1 and the first shaft mounting portion 107B1, and between the second support portion 104B2 and the second shaft mounting portion 107B2.

[0142] As described above, the armrest body 93L2 can rotate relative to the armrest base 93L1 about axis 106 in the upward direction 118 (refer to the upward direction 118). Figure 9 ), and the direction of rotation from the rising position 101 to the falling position 100, i.e., the falling direction 119 (refer to) Figure 9 Rotation. That is, the armrest body 93L2 switches between the lowered position 100 and the raised position 101 by rotating around the axis 106.

[0143] like Figure 12 As shown, a first abutment (damper abutment) 120 and a second abutment 121 are respectively provided in the first shaft mounting portion 107B1 and the second shaft mounting portion 107B2. Figure 11 As shown, when the handrail body 93L2 is in the lowered position 100, the first abutment part 120 is located at the lower part of the first shaft mounting part 107B1 and the second shaft mounting part 107B2, and the second abutment part 121 is located at the upper part of the first shaft mounting part 107B1 and the second shaft mounting part 107B2.

[0144] like Figure 10 , Figure 11 As shown, a damper 122 is provided at the base 93L1 of the handrail. This damper 122 absorbs and mitigates (reduces) the impact of the handrail body 93L2 rotating from the raised position 101 to the lowered position 100 by abutting against the side of the handrail body 93L2. For example, a hydraulic damper is used as the damper 122. A pair of dampers 122 are provided (a first damper 122L and a second damper 122R). The first damper 122L is located to the left of the protrusion 109, and the second damper 122R is located to the right of the protrusion 109. Furthermore, a first abutting member 123L is provided in the portion where the first damper 122L is provided, and a second abutting member 123R is provided in the portion where the second damper 122R is provided.

[0145] like Figure 14 As shown, when the handrail body 93L2 is in the lowered position 100, the first abutting part 120 of the first shaft mounting part 107B1 abuts against the first damper 122L, and the first abutting part 120 of the second shaft mounting part 107B2 abuts against the second damper 122R.

[0146] like Figure 15 As shown, when the handrail body 93L2 is in the raised position 101, the second abutting part 121 of the first shaft mounting part 107B1 abuts against the first abutting member 123L, and the second abutting part 121 of the second shaft mounting part 107B2 abuts against the second abutting member 123R.

[0147] Alternatively, the damper 122 may be provided on the handrail body 93L2. In this case, when the handrail body 93L2 is switched to the lowered position 100, the damper 122 abuts against the handrail base 93L1. Furthermore, the damper 122 is not necessarily required and may be omitted. Alternatively, a cushioning member may be used as a stop instead of the damper 122.

[0148] The retaining mechanism 108 is a mechanism that holds the handrail body 93L2 in the lowered position 100 and the raised position 101. For example... Figure 10 , Figure 12 As shown, the retaining mechanism 108 is compactly assembled between the first support portion 104B1 and the second support portion 104B2. The retaining mechanism 108 has: a first cam (first member) 126 mounted on the fixed side member 104; a second cam (second member) 127 rotatable integrally with the shaft 106 and slidably supported on the shaft 106 in the axial direction; and a spring member 128 pressing the second cam 127 against the first cam 126.

[0149] The first cam 126 is disposed on the right side of the first support portion 104B1, and is externally embedded in the shaft 106 (inserted into the shaft 106) and fixed to the first support portion 104B1 by bolts or the like.

[0150] The second cam 127 is disposed to the right of the first cam 126 and is externally embedded in the shaft 106 in a slidable and rotatable manner in the axial direction.

[0151] The spring member 128 is formed of a compression coil spring and is fitted between the second cam 127 and the second support portion 104B2 on the outer periphery of the shaft 106. The spring member 128 has an axis in the same direction as the axis of the shaft 106 and is compressed between the second cam 127 and the second support portion 104B2. Therefore, the force of the spring member 128 acts in the direction of pressing the second cam 127 against the first cam 126. By pressing the second cam 127 against the first cam 126, a force is generated that holds the armrest body 93L2 in the raised position 101 and the lowered position 100, and a force that keeps the first armrest 93L from wobbling between the lowered position 100, the raised position 101, and between the lowered position 100 and the raised position 101.

[0152] like Figure 16 As shown, on the opposing surface of the first cam 126 and the second cam 127, a cam protrusion 129 protruding toward the second cam 127 is formed. A pair of cam protrusions 129 are provided. The pair of cam protrusions 129 are arranged symmetrically across the shaft 106 (radially symmetrical positions of the shaft 106).

[0153] like Figure 17As shown, on the opposing surface of the second cam 127 to the first cam 126, a cam ramp 130 is provided that abuts against the cam protrusion 129. A pair of cam ramps 130 are provided corresponding to a pair of cam protrusions 129. Each cam ramp 130 has: a top 130a closest to the first cam 126; a first ramp 130b and a second ramp 130c formed across the top 130a, namely, a first ramp 130b on the upward direction 118 side of the top 130a and a second ramp 130c on the downward direction 119 side of the top 130a.

[0154] Figure 18 This indicates that the armrest body 93L2 is in the lowered position 100. When the armrest body 93L2 is rotated from the lowered position 100 to the raised position 101, the cam protrusion 129 abuts against the first inclined surface 130b and passes over the top 130a to abut against the second inclined surface 130c.

[0155] like Figure 19 As shown, when the armrest body 93L2 is in the raised position 101, the cam protrusion 129 abuts against the second inclined surface 130c, and the force of the spring member 128 causes the armrest body 93L2 to rotate in the upward direction 118. Furthermore, when the armrest body 93L2 rotates from the raised position 101 to the downward direction 119, the cam protrusion 129 compresses the spring member 128, preventing it from passing the top 130a of the cam inclined surface 130, thus preventing the armrest body 93L2 from descending. Therefore, the armrest body 93L2 is held in the raised position 101.

[0156] Furthermore, the cam protrusion 129 abuts against the first inclined surface 130b, generating a force that assists the rotation of the armrest body 93L2 in the downward direction 119. The cam protrusion 129 abuts against the second inclined surface 130c, generating a force that assists the rotation of the armrest body 93L2 in the upward direction 118. That is, the cam protrusion 129 and the cam inclined surface 130, through mutual abutment, cause the force of the spring member 128 to act in the direction of the rotation of the armrest body 93L2, so that from the midpoint between the downward position 100 and the upward position 101, the armrest body 93L2 rotates towards the downward position 100 on the downward position 100 side and from the midpoint on the upward position 101 side, the armrest body 93L2 rotates towards the upward position 101.

[0157] In the retaining mechanism 108 of this embodiment, a first cam 126, a second cam 127 and a spring member 128 are assembled on a shaft 106 (coaxially), thereby enabling a compact structure that can be compactly housed within the thickness of the armrest 93 in the vertical direction.

[0158] Alternatively, the cam protrusion 129 can be formed on the second cam 127, and the cam ramp 130 can be formed on the first cam 126.

[0159] like Figure 20 , Figure 21 As shown, an operating mechanism 131 is assembled on the second handrail 93R. The operating mechanism 131 is a mechanism for operating the bulldozing device 7. The operating mechanism 131 includes: a bulldozing operating lever (operating member) 80; an angle sensor 132 for detecting the operating direction (swing direction) and operating amount (swing amount) of the bulldozing operating lever 80; and an operating support mechanism 133 for supporting the bulldozing operating lever 80.

[0160] like Figure 5 As shown, the bulldozing control lever 80 is located on the side opposite to the mounting portion 92 of the handrail base 93R1 of the second handrail 93R. That is, it is located on the right side of the control panel body 87 (the handrail base 93R1 of the second handrail 93R). On the right side of the handrail base 93R1, a recessed portion 88 is formed, recessed from right to left. The bulldozing control lever 80 has: a handle 80A held by the driver; and a rod shaft 80B on the upper part of the handle 80A. The bulldozing control lever 80 is located on the right side of the control panel body 87 by inserting the lower part of the rod shaft 80B into the recessed portion 88 from the right. The bulldozing control lever 80 can be swung in the forward and backward direction with the lower part as the center from the neutral position extending vertically along the rod shaft 80B. By swinging the bulldozing operating lever 80 from the neutral position to the forward side, the bulldozing device 7 (bulldozer 7B) is lowered; by swinging it to the rear side, the bulldozing device 7 (bulldozer 7B) is raised.

[0161] like Figure 21 As shown, the angle sensor 132 is, for example, a potentiometer. The angle sensor 132 is connected to the control device U1. The control device U1 can obtain the detection information (operation direction and operation amount of the bulldozer operating lever 80) from the angle sensor 132. Therefore, the detection signal detected by the angle sensor 132 is sent to the control device U1, and the control device U1 electrically controls the control valve V2 that controls the bulldozer cylinder C1 based on the detection signal from the angle sensor 132.

[0162] like Figure 21 As shown, the angle sensor 132 is housed within the mounting portion 92 (the second component portion 94B of the first structure 87A) of the control panel body 87. Since the angle sensor 132 is relatively long in the vertical direction, if it were housed, for example, in the armrest base 93R1 of the second armrest 93R, a downwardly protruding portion could be formed on the lower surface of the second armrest 93R. By housing the angle sensor 132 within the mounting portion 92, a downwardly protruding portion on the lower surface of the second armrest 93R can be prevented. In other words, the lower surface of the second armrest 93R can be made flat.

[0163] like Figures 20-23 As shown, the operating support mechanism 133 includes: a rotating shaft 134 fixed to the bulldozing operating lever 80; a shaft support member 135 supporting the rotating shaft 134 so that it can rotate freely about its axis; a neutral return mechanism 136 returning the bulldozing operating lever 80 from the operating position to the neutral position; and a swing limiting mechanism 137 limiting the amount of operation of the bulldozing operating lever 80 from the neutral position. Furthermore, the operating support mechanism 133 is housed within the hollow interior of the second handrail 93R. In this embodiment, the operating support mechanism 133 is housed within the hollow interior of the handrail base 93R1 of the second handrail 93R.

[0164] like Figure 20 , Figure 21 As shown, the rotating shaft 134 has a central axis extending in the first horizontal direction 138 along the width direction K2 of the machine body, and is disposed below the upper wall 96 of the second handrail 93R (handrail base 93R1). Furthermore, the rotating shaft 134 protrudes from the end side of the second handrail 93R (handrail base 93R1) on the side of the bulldozing operating lever 80 (one end side in the width direction K2 of the machine body) in the width direction K2 of the machine body (to the left). In this embodiment, the rotating shaft 134 is disposed transversely through the second handrail 93R (handrail base 93R1) in the width direction K2 of the machine body.

[0165] The right end (one end in the axial direction) of the rotating shaft 134 protrudes from the second handle 93R and is fixed to the lower end of the shaft 80B of the bulldozing operating lever 80. The rotating shaft 134 is capable of rotating about an axis extending along the first horizontal direction 138. The bulldozing operating lever 80 is positioned at one end (the right end) of the rotating shaft 134 in the axial direction and rotates integrally with the rotating shaft 134. That is, the rotating shaft 134 rotates about its axis through the swinging operation of the bulldozing operating lever 80. The other end (the left end) of the rotating shaft 134 in the axial direction engages with the detection shaft of the angle sensor 132. The angle sensor 132 detects the rotation direction and the rotation angle about its axis of the rotating shaft 134. Thus, it detects the operating direction and the amount of operation of the bulldozing operating lever 80.

[0166] Furthermore, the direction along the width direction K2 includes both directions aligned with the width direction K2 and directions slightly inclined relative to the width direction K2. (See the illustration). Figure 20 In the first horizontal direction 138, the tilt is slightly inclined relative to the width direction K2 of the fuselage, in the direction of tilt that shifts backward as it moves to the right.

[0167] like Figures 21-24As shown, the shaft support member 135 includes: a cylindrical member 140 having a shaft extending along a first horizontal direction 138; a mounting support 141 fixed to the upper part of the cylindrical member 140; and a sensor bracket 142 fixed to the left end of the cylindrical member 140. The cylindrical member 140 is concentrically inserted to the left from the middle part of the rotating shaft 134. In other words, the left part of the rotating shaft 134 is rotatably inserted into the cylindrical member 140 about its axis.

[0168] like Figure 24 As shown, the mounting support 141 is mounted to the mounting portion 124, which protrudes downward from the lower surface of the upper wall 96, by bolts or the like. Figure 21 , Figure 22 As shown, an angle sensor 132 is mounted on the sensor bracket 142.

[0169] like Figure 22 , Figure 23 , Figure 25 As shown, the neutral return mechanism 136 is positioned above the right side of the rotating shaft 134. Specifically, the neutral return mechanism 136 is positioned above the portion of the rotating shaft 134 protruding from the cylindrical member 140, and between the upper wall 96 and the rotating shaft 134. The neutral return mechanism 136 includes a linkage arm 143, a spring device 144, and a support frame member 145. The lower end of the linkage arm 143 is fixed to the rotating shaft 134, and it protrudes upwards from the rotating shaft 134. That is, the linkage arm 143 rotates integrally with the rotating shaft 134.

[0170] like Figure 22 , Figure 23 , Figure 25 As shown, the spring device 144 includes a linkage shaft 146, a housing member 147, and a neutral return spring 148. The linkage shaft 146 is located above the rotation shaft 134 and extends along a second horizontal direction 139 that intersects (orthogonally to) the first horizontal direction 138 (see reference). Figure 20 Configuration. One end (front end) of the linkage shaft 146 is pivotally supported and connected to the upper part of the linkage arm 143 via a pin 149. The housing member 147 is disposed on the rear side of the linkage shaft 146, housing the other end (rear part) of the linkage shaft 146. The linkage shaft 146 is movably supported on the housing member 147 in the axial direction and can move freely in and out of the housing member 147.

[0171] like Figure 25As shown, the neutral return spring 148 is formed of a compression coil spring and is housed in the spring receiving portion 147A of the housing member 147. Furthermore, the neutral return spring 148 is arranged on the outer periphery of the linkage shaft 146 with its axial direction aligned with the axial direction of the linkage shaft 146. Therefore, the neutral return spring 148 and the linkage shaft 146 are arranged together along the second horizontal direction 139. This allows for a thinner vertical thickness of the neutral return mechanism 136 (operation support mechanism 133). Additionally, the components constituting the neutral return mechanism 136 are positioned above the rotation shaft 134. That is, the neutral return mechanism 136 does not have any components protruding downwards from the rotation shaft 134. Therefore, when components are positioned below the rotation shaft 134, interference from the neutral return mechanism 136 with those components can be prevented.

[0172] Inside the spring receiving portion 147A, a first spring receiving member 150 and a second spring receiving member 151 disposed behind the first spring receiving member 150 are provided. A neutral return spring 148 is clamped between these first spring receiving members 150 and second spring receiving members 151 in a compressed state. The first spring receiving member 150 has: a cylindrical portion 150a, which is fitted into the outer periphery of the linkage shaft 146 so as to be movable relative to it in the axial direction; a first portion 150b, which abuts against an abutment restraint member 152 fixedly disposed at the front of the spring receiving portion 147A; and a second portion 150c, which engages with a stepped portion 146a formed on the linkage shaft 146. The second spring receiving member 151 has: a cylindrical portion 151a, an end member 146b formed on the rear end side of the linkage shaft 146, which is housed in the cylindrical portion 151a in such a way that it can move relative to the linkage shaft 146 in the axial direction; a first portion 151b, which abuts against a rear abutment restraint member 153 which is fixedly disposed in the spring receiving portion 147A; and a second portion 151c, which engages with the end member 146b.

[0173] like Figure 23 , Figure 25 As shown, the bracket member 145 has: an upper wall 145a; a first side wall 145b extending downward from one side edge (left side edge) of the upper wall 145a; and a second side wall 145c extending downward from the other side edge (right side edge) of the upper wall 145a. The upper wall 145a is mounted by bolts or the like to a mounting portion 154 that protrudes downward from the lower surface of the bracket mounting portion 156 of the upper wall 96 of the handrail base 93R1.

[0174] The first side wall 145b and the second side wall 145c have a pivot support wall portion 145d extending downward at the rear. A pivot support pin 155 is provided in each pivot support wall portion 145d. Between the first side wall 145b and the second side wall 145c, the supported portion 147B at the front of the housing member 147 is pivotally supported via the pivot support pin 155 about an axis orthogonal to the axis of the linkage shaft 146.

[0175] In the aforementioned neutral return mechanism 136, when the bulldozing operating lever 80 is swung forward from the neutral position, the linkage arm 143 swings forward, causing the rotating shaft 134 to rotate and the linkage shaft 146 to move forward. This causes the second spring receiving member 151 and the end member 146b to move forward together, compressing the neutral return spring 148. Conversely, when the bulldozing operating lever 80 is swung backward from the neutral position, the linkage arm 143 swings backward, causing the rotating shaft 134 to rotate and the linkage shaft 146 to move backward. This causes the first spring receiving member 150 and the stepped portion 146a of the linkage shaft 146 to move backward together, compressing the neutral return spring 148. When the swaying operation of the bulldozing operating lever 80 is released, the force of the neutral return spring 148 returns the bulldozing operating lever 80 from the operating (swinging) position to the neutral position. In addition, an operating load is applied to the bulldozing operating lever 80 via the neutral return spring 148.

[0176] like Figure 21 As shown, the bracket mounting portion 156 of the mounting bracket member 145 on the upper wall 96 is recessed upwards from below. This increases the height of the lower surface of the second handrail 93R and widens the space below the second handrail 93R.

[0177] like Figure 23 , Figure 26 As shown, the swing limiting mechanism 137 and the neutral return mechanism 136 are arranged along the rotation axis 134. Specifically, the swing limiting mechanism 137 is located to the left of the neutral return mechanism 136. By arranging the swing limiting mechanism 137 and the neutral return mechanism 136 along the rotation axis 134, the thickness of the operating support mechanism 133 in the vertical direction can be reduced.

[0178] The swing limiting mechanism 137 includes: a support plate 157 fixed to the rotation shaft 134; a limiting shaft 158 ​​disposed on the support plate 157; and an abutting member 159 disposed above the rotation shaft 134 and opposite to the support plate 157.

[0179] Support plate 157 protrudes from the rotation shaft 134 toward the second horizontal direction 139. Specifically, support plate 157 includes: a first support plate 157A, protruding from the rotation shaft 134 toward one side (front side) of the second horizontal direction 139; and a second support plate 157B, protruding from the rotation shaft 134 toward the other side (rear side) of the second horizontal direction 139. The first support plate 157A and the second support plate 157B have through holes 160 formed in a through-hole shape. A nut member 161A is fixed to the forming portion and upper surface of the through hole 160 on the first support plate 157A. A nut member 161B is also fixed to the forming portion and upper surface of the through hole 160 on the second support plate 157B.

[0180] The limiting shaft 158 ​​is mounted on the support plate 157 in a manner that allows it to move forward and backward relative to the abutment member 159. When the bulldozing operating lever 80 is swung from the neutral position, it abuts against the abutment member 159 to limit the swing of the bulldozing operating lever 80. Specifically, the limiting shaft 158 ​​includes a first limiting shaft 158A mounted on the first support plate 157A and a second limiting shaft 158B mounted on the second support plate 157B. The first limiting shaft 158A is inserted through the insertion hole 160 of the first support plate 157A and screwed into the nut member 161A, and the second limiting shaft 158B is inserted through the insertion hole 160 of the second support plate 157B and screwed into the nut member 161B. By screwing the first limiting shaft 158A into and out of the nut member 161A, the first limiting shaft 158A moves forward and backward relative to the abutment member 159. Similarly, by screwing the second limiting shaft 158B into and out of the nut member 161B, the second limiting shaft 158B moves forward and backward relative to the abutment member 159. This allows adjustment of the operating amount of the bulldozer operating lever 80 from the neutral position. The first limiting shaft 158A and the second limiting shaft 158B are inserted into the insertion hole 160 without protruding downwards from it, and their upper parts protrude upwards from the nut members 161A and 161B.

[0181] like Figure 26 As shown, the abutment member 159 is formed of a sheet metal and is positioned above the rotation shaft 134 and the support plate 157, with the plate surface facing vertically. Furthermore, the abutment member 159 is positioned opposite the support plates 157 (first support plate 157A, second support plate 157B). The abutment member 159 has a first limiting portion 159A that abuts against a first limiting shaft 158A when the bulldozing lever 80 is moved from the neutral position to one side; and a second limiting portion 159B that abuts against a second limiting shaft 158B when the bulldozing lever 80 is moved from the neutral position to the other side. The first limiting portion 159A and the second limiting portion 159B are recessed upwards from the lower surface of the abutment member 159. This reduces the distance between the rotation shaft 134 and the abutment member 159.

[0182] In the swing limiting mechanism 137 described above, the first support plate 157A protrudes from the rotation shaft 134 to one side (front side) of the second horizontal direction 139, and the second support plate 157B protrudes from the rotation shaft 134 to the other side (rear side) of the second horizontal direction 139. Above the first support plate 157A and the second support plate 157B, an abutting member 159 made of sheet metal is arranged with the plate surface facing up and down, so that the thickness in the vertical direction can be reduced.

[0183] Furthermore, in the aforementioned operating mechanism 131, since the vertical thickness of the operating support mechanism 133 is made relatively thin, the space below the operating support mechanism 133 can be effectively utilized. For example, as... Figure 27 As shown, this allows pipe 66C, which branches off from pipe 66B, to pass under the second handrail 93R.

[0184] Furthermore, the control mechanism 131 is not limited to the mechanism for controlling the bulldozer device 7. As an operating component, it may be, for example, a travel pedal, a swing operating component for operating the swing bracket, an AUX pedal for operating an attachment that replaces the bucket or is installed with the bucket, etc.

[0185] Furthermore, the control mechanism 131 is not limited to being mounted on the control panel 81 located in front of the driver's seat 6; it can also be mounted on the control panel 81 located to the side of the driver's seat 6, or it can be mounted on the floor portion constituting the upper surface of the machine body. In addition, the control mechanism 131 does not have any parts protruding below the rotation axis 134, thus avoiding interference with components located below the rotation axis 134.

[0186] The work machine 1 of this embodiment includes: a body 2; a driver's seat 6 mounted on the body 2; and a control panel 81, which is located in front of the driver's seat 6 on the body 2 and is equipped with a control member 82 for holding and operating. The control panel 81 includes an upward-folding armrest (first armrest 93L) extending from the side of the control panel 81 to the rear. The upward-folding armrest 93L is configured to switch between a first posture 98 that hinders the driver from getting on and off the driver's seat 6 and a second posture 99 that allows the driver to get on and off the driver's seat 6. In the first posture 98, the movement of the object to be operated by the control member 82 is allowed, and in the second posture 99, the movement of the object to be operated is prevented.

[0187] According to this structure, the handrail 93L can have the function of allowing and preventing the movement of the object operated by the control member 82, thereby simplifying the structure and reducing costs.

[0188] In addition, the control panel 81 has: a base 86 erected on the body 2; and a control panel body 87 disposed on the upper part of the base 86. The control panel body 87 includes a mounting part 92 mounted on the base 86 and a flip-up armrest 93L. The flip-up armrest 93L has: an armrest base 93L1 disposed on the side of the mounting part 92; and an armrest body 93L2 pivotally supported on the armrest base 93L1. The armrest body 93L2 can change position between a position extending rearward from the armrest base 93L1, which forms a descending position 100 of the first posture 98, and a position rotating upward from the descending position 100, which forms a rising position 101 of the second posture 99.

[0189] According to this structure, by moving the armrest body 93L2 from the lowered position 100 to the raised position 101, the armrest 93L can be easily switched to the first posture 98 and the second posture 99.

[0190] In addition, there is a detection switch 102 that detects the position of the handrail body 93L2.

[0191] Based on this structure, the first posture 98 and the second posture 99 can be detected.

[0192] Additionally, a damper 122 is provided, which is disposed on one side of the handrail base 93L1 or the handrail body 93L2. By abutting against the other side of the handrail base 93L1 or the handrail body 93L2, the damper mitigates the impact when the handrail body 93L2 rotates from the rising position 101 to the falling position 100.

[0193] According to this structure, even if the armrest body 93L2 is lowered roughly, it can prevent the generation of large noises and vibrations, and also improve comfort.

[0194] In addition, a holding mechanism 108 is provided, which holds the armrest body 93L2 in the lowered position 100 and the raised position 101.

[0195] According to this structure, the armrest body 93L2 can be held in the lowered position 100 and the raised position 101.

[0196] Additionally, it includes: a fixed-side member 104 installed on the base of the handrail 93L1; and a shaft 106 supported on the fixed-side member 104 and rotating integrally with the handrail body 93L2. The fixed-side member 104 has: a first support portion 104B1 on one end of the support shaft 106 in the axial direction; and a second support portion 104B2 on the other end of the support shaft 106 in the axial direction. A retaining mechanism 108 is assembled between the first support portion 104B1 and the second support portion 104B2.

[0197] Based on this structure, a rotating mechanism and a retaining mechanism 108 that can rotatably support the handrail body 93L2 can be compactly constructed.

[0198] Additionally, the retaining mechanism 108 includes: a first member (first cam 126) mounted on the fixed side member 104; a second member (second cam 127) rotatable and slidably supported on the shaft 106 along the axial direction; and a spring member 128 that presses the second member 127 against the first member 126.

[0199] According to this structure, the retaining mechanism 108 can be compactly assembled onto the shaft 106.

[0200] In addition, the retaining mechanism 108 has: a cam protrusion 129 disposed on one side of the first member 126 or the second member 127; and a cam ramp 130 disposed on the other side of the first member 126 or the second member 127 and abutting against the cam protrusion 129. The cam protrusion 129 and the cam ramp 130 abut against each other so that the armrest body 93L2 rotates from the lower position 100 to the lower position 100 from the intermediate position between the lower position 100 and the upper position 101 and rotates from the intermediate position to the upper position 101 from the upper position 101, thereby applying the force of the spring member 128.

[0201] This structure can assist the rotation of the handrail body 93L2.

[0202] In addition, when the armrest body 93L2 is in the raised position 101, the retaining mechanism 108 abuts against the cam protrusion 129 and the cam inclined surface 130, causing the spring member 128 to exert its force in the direction that causes the armrest body 93L2 to rotate from the lowered position 100 to the raised position 101.

[0203] According to this structure, the raised position 101 of the handrail body 93L2 can be reliably maintained.

[0204] Additionally, it includes: a damper 122 disposed on one side of the handrail base 93L1 or the handrail body 93L2, which abuts against the other side of the handrail base 93L1 or the handrail body 93L2 to mitigate the impact when the handrail body 93L2 is rotated from the rising position 101 to the falling position 100; and a movable side member 107, which rotates integrally with the shaft 106 and is mounted on the handrail body 93L2, the damper 122 being disposed on the handrail base 93L1, and the movable side member 107 having a damper abutment portion (first abutment portion 120) that abuts against the damper 122.

[0205] According to this structure, by providing the damper abutment portion 120 that abuts against the damper 122 on the movable side member 107, it is possible to reduce the number of components and simplify the structure.

[0206] In addition, the work machine 1 of this embodiment includes: a body 2; a driver's seat 6 mounted on the body 2; a control panel 81 located in front of the driver's seat 6; an operating member (bulldozer control lever 80) capable of swinging operation disposed on the control panel 81; and an operating support mechanism 133 supporting the operating member 80. The control panel 81 includes a hollow handrail (second handrail 93R) extending rearward from the side of the control panel 81. The operating support mechanism 133 has a neutral return mechanism 136 for returning the operating member 80 from the operating position to the neutral position, and a swing limiting mechanism 137 for limiting the amount of operation of the operating member 80 from the neutral position, and is housed inside the hollow interior of the handrail 93R.

[0207] According to this structure, by housing the operating support mechanism 133, which includes a neutral return mechanism 136 and a swing limiting mechanism 137, inside the hollow interior of the handrail 93R, it is possible to prevent the operating support mechanism 133 supporting the operating member 80 from protruding downwards from the handrail 93R.

[0208] In addition, the operating support mechanism 133 has: a rotating shaft 134 that rotates about an axis by the swing operation of the operating member 80; and a shaft support member 135 that supports the rotating shaft 134 in a manner that allows it to rotate about an axis. The rotating shaft 134 is disposed below the upper wall 96 of the handrail 93R and protrudes laterally from one end of the handrail 93R in the width direction K2 of the body.

[0209] According to this structure, the operating member 80, which can be operated in the front-rear direction via the rotating shaft 134, can be supported in a simple structure.

[0210] Additionally, the neutral return mechanism 136 includes: a spring device 144 disposed between the upper wall 96 and the rotation shaft 134, and having a neutral return spring 148 for returning the operating member 80 to the neutral position; and a bracket member 145 supporting the spring device 144 and mounted on the upper wall 96, wherein the bracket mounting portion 156 of the bracket member 145 on the upper wall 96 is recessed from the bottom upward.

[0211] According to this structure, the height of the lower surface of the armrest 93R can be increased, and the space below the armrest 93R can be widened.

[0212] In addition, the swing limiting mechanism 137 and the neutral return mechanism 136 are arranged along the rotation axis 134.

[0213] According to this structure, the operating support mechanism 133 can be compactly configured by arranging the neutral return mechanism 136 and the swing limiting mechanism 137 side by side.

[0214] Additionally, the swing limiting mechanism 137 includes: a support plate 157 fixed to the rotation shaft 134; an abutment member 159 opposite to the support plate 157; and a limiting shaft 158 ​​mounted on the support plate 157 in a retractable manner relative to the abutment member 159, abutting against the abutment member 159 when the operating member 80 swings from the neutral position, thereby limiting the swing of the operating member 80.

[0215] According to this structure, the amount of operation of the operating component 80 can be adjusted from the neutral position.

[0216] Additionally, the support plate 157 includes a first support plate 157A protruding forward from the rotation shaft 134; and a second support plate 157B protruding rearward from the rotation shaft 134. The limiting shaft 158 ​​includes a first limiting shaft 158A mounted on the first support plate 157A; and a second limiting shaft 158B mounted on the second support plate 157B. The abutting member 159 is disposed above the rotation shaft 134 and has a first limiting portion 159A that abuts against the first limiting shaft 158A when the operating member 80 is operated from the neutral position to one side; and a second limiting portion 159B that abuts against the second limiting shaft 158B when the operating member 80 is operated from the neutral position to the other side. The first limiting portion 159A and the second limiting portion 159B are recessed upward from the lower surface of the abutting member 159.

[0217] According to this structure, the gap between the rotating shaft 134 and the abutment member 159 can be reduced.

[0218] In addition, the control panel 81 has: a base 86 erected on the body 2; and a control panel body 87 disposed on the upper part of the base 86. The control panel body 87 includes a mounting part 92 mounted on the base 86 and an armrest 93R. The armrest 93R has: an armrest base 93R1 disposed on the side of the mounting part 92; and an armrest body 93R2 extending from the armrest base 93R1 toward the driver's seat 6. The operating member 80 is disposed on the side of the armrest base 93R1 opposite to the mounting part 92, and the operating support mechanism 133 is housed in the armrest base 93R1.

[0219] According to this structure, the operation support mechanism 133, which supports the operation member 80 located on the opposite side of the mounting part 92 and disposed on the base of the handrail 93R1, can be well housed in the handrail 93R.

[0220] In addition, an angle sensor 132 is provided to detect the operating direction and operating amount of the operating member 80, and the angle sensor 132 is housed in the mounting part 92.

[0221] By housing the angle sensor 132 in the mounting portion 92, it is possible to prevent a downward protrusion from forming on the lower surface of the handrail 93R.

[0222] Furthermore, the operating mechanism 131 of this embodiment includes: a rotation shaft 134, which is rotatable about an axis extending along a first horizontal direction 138; an operating member (bulldozer operating lever 80), which is disposed at one end of the rotation shaft 134 in the axial direction and rotates integrally with the rotation shaft 134; an angle sensor 132, which is disposed at the other end of the rotation shaft 134 in the axial direction and detects the rotation angle of the rotation shaft 134; and a neutral return mechanism 136, which returns the operating member 80 from the operating position to the neutral position and is disposed between the operating member 80 and the angle sensor 132.

[0223] According to this structure, the thickness of the operating mechanism 131 in the vertical direction can be reduced. As a result, the space below the operating mechanism 131 can be effectively utilized.

[0224] Additionally, the neutral return mechanism 136 includes: a linkage shaft 146 disposed on the upper side of the rotation shaft 134 along a second horizontal direction 139 intersecting the first horizontal direction 138; a linkage arm 143 pivotally supporting and connecting one end of the linkage shaft 146 and protruding upward from the rotation shaft 134; and a neutral return spring 148 formed by a helical spring externally embedded on the other end of the linkage shaft 146, which applies force to the linkage shaft 146 in order to return the operating member 80 to the neutral position.

[0225] According to this structure, the thickness of the operating mechanism 131 in the vertical direction can be further reduced.

[0226] Additionally, the neutral return mechanism 136 has a bracket member 145, which is disposed above the rotation shaft 134 and pivotally supports the housing member 147 that houses the other end of the linkage shaft 146 and the neutral return spring 148.

[0227] According to this structure, the neutral return mechanism 136 can be positioned above the rotation shaft 134, thereby eliminating the component protruding downwards from the rotating member and avoiding interference with the component positioned below the rotation shaft 134.

[0228] Additionally, a swing limiting mechanism 137 is provided, which limits the amount of operation of the operating member 80 from the neutral position, and is arranged along the rotation axis 134 between the operating member 80 and the angle sensor 132 and the neutral return mechanism 136.

[0229] According to this structure, by arranging the neutral return mechanism 136 and the swing limiting mechanism 137 side by side, the thickness of the operating mechanism 131 in the vertical direction can be reduced.

[0230] Additionally, the swing limiting mechanism 137 includes: a support plate 157 protruding from the rotation shaft 134 toward the second horizontal direction 139; a limiting shaft 158 ​​mounted on the support plate 157; and an abutting member 159 disposed above the rotation shaft 134 and abutting the limiting shaft 158 ​​in the operating position after the operating member 80 is operated from the neutral position, thereby limiting the swing of the operating member 80.

[0231] According to this structure, the swing limiting mechanism 137 can be positioned above the rotation shaft 134, thereby eliminating the component protruding downwards from the rotating member and preventing interference with the component positioned below the rotation shaft 134.

[0232] Additionally, the support plate 157 includes: a first support plate 157A, protruding from one side of the rotation shaft 134 toward the second horizontal direction 139; and a second support plate 157B, protruding from the rotation shaft 134 toward the other side of the second horizontal direction 139. The limiting shaft 158 ​​has: a first limiting shaft 158A, mounted on the first support plate 157A, abutting against the abutting member 159 when the operating member 80 is operated from the neutral position to one side; and a second limiting shaft 158B, mounted on the second support plate 157B, abutting against the abutting member 159 when the operating member 80 is operated from the neutral position to the other side. The first limiting shaft 158A and the second limiting shaft 158B are mounted in a manner that allows them to move forward and backward relative to the abutting member 159.

[0233] According to this structure, the thickness of the operating mechanism 131 in the vertical direction can be reduced.

[0234] In addition, the abutting member 159 has: a first limiting part 159A abutting against the first limiting shaft 158A; and a second limiting part 159B abutting against the second limiting shaft 158B. The first limiting part 159A and the second limiting part 159B are formed by recessing from the lower surface of the abutting member 159 upward.

[0235] According to this structure, the gap between the rotating shaft 134 and the abutment member 159 can be reduced, and the thickness of the operating mechanism 131 in the vertical direction can be reduced.

[0236] The foregoing has described one embodiment of the present invention, but it should be considered that the embodiments disclosed herein are illustrative rather than restrictive in all respects. The scope of the present invention is indicated by the scope of the claims, rather than by the foregoing description, and is intended to include all modifications in the same sense and scope as the scope of the claims.

[0237] Label Explanation

[0238] 2 bodies

[0239] 6 driver's seats

[0240] 80 Operating components (bulldozing control lever)

[0241] 81 control panel

[0242] 82 control components

[0243] 86 abutment

[0244] 87 main control panel

[0245] 92 Installation Department

[0246] 93L Upward-folding armrest (first armrest)

[0247] 93L1 Handrail Base

[0248] 93L2 Handrail Body

[0249] 93R Handrail (Second Handrail)

[0250] 98 First Posture

[0251] 99 Second Position

[0252] 100 descending position

[0253] 101 rising position

[0254] 102 Detection Switch

[0255] 106 axes

[0256] 107 movable side members

[0257] 108 Maintenance Organization

[0258] 120 damper contact section (first contact section)

[0259] 122 damper

[0260] 132 Angle Sensor

[0261] 133 Operating support mechanism

[0262] 134 rotating shaft

[0263] 135 shaft support components

[0264] 136 Neutral Return Agency

[0265] 137 Swing Limiting Mechanism

[0266] 138 First horizontal direction

[0267] 139 Second horizontal direction

[0268] 143 linkage arm

[0269] 145 bracket components

[0270] 146 linkage shaft

[0271] 147 Shell Components

[0272] 148 Neutral Return Spring

[0273] 157 support plate

[0274] 157A First Support Plate

[0275] 157B Second Support Plate

[0276] 158 limiting axis

[0277] 158A First Limiting Axis

[0278] 158B Second Limiting Shaft

[0279] 159 Abutment Components

[0280] 159A First Restriction Section

[0281] 159B Second Restriction Section

[0282] K2 fuselage width direction.

Claims

1. An operating mechanism, comprising: A rotating shaft that can rotate about an axis extending in a first horizontal direction; An operating component is disposed at one end of the rotating shaft in the axial direction and rotates integrally with the rotating shaft; An angle sensor is disposed at the other end of the rotating shaft in the axial direction to detect the rotation angle of the rotating shaft; as well as A neutral return mechanism is provided, which returns the operating member from the operating position to a neutral position, and the neutral return mechanism is disposed between the operating member and the angle sensor. The neutral return mechanism has: A linkage shaft is disposed above the rotation shaft along a second horizontal direction that intersects the first horizontal direction; A linkage arm, which pivotally supports and connects to one end of the linkage shaft, and is disposed on the rotating shaft in an upward protruding manner; as well as A neutral return spring, which is formed by a helical spring externally embedded on the other end of the linkage shaft, applies force to the linkage shaft in order to return the operating member to the neutral position.

2. The operating mechanism according to claim 1, wherein, The neutral return mechanism has a bracket member disposed above the rotating shaft and pivotally supports a housing member that houses the other end of the linkage shaft and the neutral return spring.

3. An operating mechanism, comprising: A rotating shaft that can rotate about an axis extending in a first horizontal direction; An operating component is disposed at one end of the rotating shaft in the axial direction and rotates integrally with the rotating shaft; An angle sensor is disposed at the other end of the rotating shaft in the axial direction to detect the rotation angle of the rotating shaft; as well as A neutral return mechanism is provided, which returns the operating member from the operating position to a neutral position, and the neutral return mechanism is disposed between the operating member and the angle sensor. The operating mechanism includes a swing limiting mechanism that limits the amount of operation of the operating member from the neutral position, and is arranged between the operating member and the angle sensor along the rotation axis with the neutral return mechanism.

4. The operating mechanism according to claim 3, wherein, The swing limiting mechanism includes: a support plate that protrudes from the rotation axis on a second horizontal direction side orthogonal to the first horizontal direction; a limiting shaft that is mounted on the support plate; and an abutment member disposed on the upper side of the rotation axis, which abuts the limiting shaft at the operating position after the operating member is operated from the neutral position to limit the swing of the operating member.

5. The operating mechanism according to claim 4, wherein, The support plate includes: a first support plate protruding from one side of the rotation axis in the second horizontal direction; and a second support plate protruding from the other side of the rotation axis in the second horizontal direction. The limiting shaft has: a first limiting shaft mounted on the first support plate and abutting against the abutting member when the operating member is operated from the neutral position to one side; and a second limiting shaft mounted on the second support plate and abutting against the abutting member when the operating member is operated from the neutral position to the other side. The first limiting shaft and the second limiting shaft are installed in a manner that allows them to move forward and backward relative to the abutting member.

6. The operating mechanism according to claim 5, wherein, The abutting member has: a first limiting portion for the first limiting shaft to abut against; and a second limiting portion for the second limiting shaft to abut against. The first limiting portion and the second limiting portion are formed by recessing upward from the lower surface of the abutting member.

7. A work machine comprising the operating mechanism according to any one of claims 1 to 6.

8. The work machine according to claim 7, wherein, The work machine has: Organism; The driver's seat, which is mounted on the aforementioned aircraft; The control panel is located in front of the driver's seat; An operating component capable of swinging is disposed on the control panel; as well as An operating support mechanism that supports the operating component. The control panel includes a hollow armrest extending rearward. The operating support mechanism has the neutral return mechanism and a swing limiting mechanism that limits the amount of operation of the operating member from the neutral position, and the operating support mechanism is housed inside the hollow interior of the handrail.

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