WO2022163225A1 - 中立復帰機構 - Google Patents

中立復帰機構 Download PDF

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Publication number
WO2022163225A1
WO2022163225A1 PCT/JP2021/047462 JP2021047462W WO2022163225A1 WO 2022163225 A1 WO2022163225 A1 WO 2022163225A1 JP 2021047462 W JP2021047462 W JP 2021047462W WO 2022163225 A1 WO2022163225 A1 WO 2022163225A1
Authority
WO
WIPO (PCT)
Prior art keywords
interlocking shaft
neutral return
spring
shaft
neutral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/047462
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
啓司 堀井
徹也 青木
弘孝 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
KYB YS Co Ltd
Original Assignee
Kubota Corp
KYB YS Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kubota Corp, KYB YS Co Ltd filed Critical Kubota Corp
Priority to JP2022578158A priority Critical patent/JP7612719B2/ja
Priority to CN202180081619.8A priority patent/CN116710617A/zh
Priority to EP21923228.7A priority patent/EP4286602A4/en
Publication of WO2022163225A1 publication Critical patent/WO2022163225A1/ja
Priority to US18/205,190 priority patent/US12066852B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/963—Arrangements on backhoes for alternate use of different tools
    • E02F3/964—Arrangements on backhoes for alternate use of different tools of several tools mounted on one machine
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/05—Means for returning or tending to return controlling members to an inoperative or neutral position, e.g. by providing return springs or resilient end-stops
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/06—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
    • G05G5/06—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only
    • G05G5/065—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member for holding members in one or a limited number of definite positions only using a spring-loaded ball
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2004—Control mechanisms, e.g. control levers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
    • G05G1/04—Controlling members for hand actuation by pivoting movement, e.g. levers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G2505/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member

Definitions

  • the present invention relates to a neutral return mechanism that returns operating members such as levers and pedals to their neutral positions.
  • Patent Document 1 a working machine disclosed in Patent Document 1 is known.
  • the work machine disclosed in Patent Document 1 is provided with an operating member (dozer lever) that can be swung in one direction and the other from a neutral position and that operates a control valve that hydraulically controls a hydraulic actuator.
  • the operating member operates a pilot valve, and the pilot valve operates a control valve that hydraulically controls the hydraulic actuator.
  • a neutral return mechanism that returns the operating member to the neutral position is incorporated in the pilot valve.
  • the present invention provides a compact neutral return mechanism capable of swinging from a neutral position in one direction and in the other direction opposite to the one direction, and returning to the neutral position an operating member that operates a control valve that hydraulically controls a hydraulic actuator. intended to configure.
  • a neutral return mechanism includes an operation member capable of swinging from a neutral position in one direction and in the other direction opposite to the one direction and for operating a control valve that hydraulically controls a hydraulic actuator.
  • a neutral return mechanism for returning to a neutral position comprising: an interlocking shaft pushed and pulled in an axial direction interlocking with the swinging operation of the operating member; a housing member for accommodating the interlocking shaft so that one end side of the shaft protrudes; a neutral return spring accommodated in a housing member along the axial direction of the interlocking shaft, wherein the housing member includes a spring accommodating portion that accommodates the neutral return spring and a protrusion from which the interlocking shaft protrudes. It has a supported portion supported by the bracket member between.
  • the interlocking shaft rotates about an axis parallel to a direction perpendicular to the axis of the interlocking shaft in conjunction with the swinging motion of the operating member. It has a connecting portion that is pivotally connected to an interlocking arm that protrudes outward, and the supported portion is supported by the bracket member so as to be rotatable about an axis parallel to the axis of the rotating shaft. It has a bearing. Further, the axial length of the interlocking shaft in the supported portion is smaller than the axial length of the interlocking shaft of the neutral return spring when the interlocking shaft is at the initial position.
  • the neutral return mechanism includes a first spring receiving member and a first spring receiving member, which are accommodated in the spring accommodating portion with a space therebetween in the axial direction of the interlocking shaft, and in which the neutral return spring constituted by a coil spring is interposed therebetween.
  • the interlocking shaft has an end portion provided on the other end side opposite to the one end side of the interlocking shaft, and the first spring bearing member is supported by the supported portion.
  • the movement of the interlocking shaft in the projecting direction which is the direction in which the interlocking shaft protrudes from the housing member, is regulated, and the second spring bearing member moves integrally with the interlocking shaft in the retracting direction, which is the direction opposite to the projecting direction. Movement in the retraction direction is restricted by a portion on the housing member side, and the end portion moves integrally with the end portion in the projecting direction.
  • the interlocking shaft is operated outside the stroke range of the interlocking shaft, which is the range in which the interlocking shaft automatically returns to the initial position before being operated from the moving position operated by the operating member by the neutral return spring. It has a detent mechanism to hold it in place.
  • the detent mechanism has a detent ball, a pressing ball, and a biasing member housed in the end portion on the other end side of the interlocking shaft, the detent ball being movable in the radial direction of the interlocking shaft, and outside the range of the stroke, the interlocking shaft can be held at an operated position by protruding radially outward of the interlocking shaft from the end portion and engaging with an engaging recess provided in the spring accommodating portion, The pressing ball presses the detent ball radially outward of the interlocking shaft by the biasing force of the biasing member.
  • the neutral return spring that returns the interlocking shaft, which is pushed and pulled in the axial direction in conjunction with the swinging operation of the operating member, from the moving position to the initial position is provided in the housing member at the axial center of the interlocking shaft.
  • a compact configuration can be achieved by providing a supported portion that is accommodated along the direction and that is supported by the bracket member between the spring accommodating portion and the projecting opening from which the interlocking shaft protrudes in the housing member.
  • FIG. 1 is a side cross-sectional view of the neutral return mechanism 26
  • FIG. 2 is a side view showing the mounted state of the neutral return mechanism 26
  • FIG. 4 is a front view showing the attached state
  • FIG. 4 is a perspective view showing the state where the neutral return mechanism 26 is attached to the operating member.
  • the neutral return mechanism 26 is a mechanism for returning the swingable operation member 80 from the operated position to the neutral position P1.
  • the operating member 80 is configured by a lever.
  • the operating member 80 may be a pedal.
  • the lever 80 has a grip 80A gripped by an operator and a lever shaft 80B with the grip 80A attached to the top.
  • One end of a rotary shaft 27 is fixed to the lower end of the lever shaft 80B and is rotatable around an axis (rotation axis) X2 extending in a direction perpendicular to the axis X5 of the lever shaft 80B. .
  • the rotation shaft 27 is attached to the wall portion 54 to which the neutral return mechanism 26 is attached by a shaft attachment member (not shown), and is rotatable about the rotation axis X2 on the shaft attachment member. supported by An interlocking arm 29 is fixed to the rotating shaft 27 . The interlocking arm 29 protrudes radially outward from the rotating shaft 27 .
  • the lever 80 is pivoted in one direction D1 around the rotation axis X2 from the neutral position P1, which is the position in which the lever shaft 80B extends in the vertical direction.
  • a swing operation is possible between a certain first operation position P2 and a second operation position P3 which is a position where a swing operation is performed from the neutral position P1 around the rotation axis X2 in the other direction D2 opposite to the one direction D1. is.
  • the operating direction (swinging direction) and the operating amount (swinging amount) of the lever 80 are detected by an angle sensor S1.
  • the angle sensor S1 is configured by, for example, a potentiometer.
  • the angle sensor S1 is connected to the controller U1.
  • the control device U1 can acquire detection information of the angle sensor S1 (operation direction and operation amount of the lever 80). Therefore, the detection signal detected by the angle sensor S1 is sent to the control device U1, and the control device U1 hydraulically adjusts the hydraulic cylinder C1, which is the operation target operated by the lever 80, based on the detection signal of the angle sensor S1.
  • the control valve (hydraulic solenoid valve) V1 to be controlled is electrically controlled.
  • the controller U1 controls the current supplied to the control valve V1 (or sends a signal to the control valve V1), and the hydraulic cylinder C1 operates. Therefore, the lever 80 is an operating member for operating a control valve V1 that hydraulically controls the hydraulic cylinder (hydraulic actuator) C1. is used.
  • the neutral return mechanism 26 has an interlocking shaft 31, a housing member 32, and a neutral return spring 33.
  • the interlocking shaft 31 has a bifurcated connecting portion 34 on one end side in the axial direction D3 (one end side in the axial direction) 35A.
  • the connecting portion 34 is pivotally connected to the interlocking arm 29 by a connecting pin 36 . Therefore, when the pivot shaft 27 is pivoted by swinging the lever 80, the interlocking arm 29 pivots about the pivot axis X2, pushing and pulling the interlocking shaft 31 in the axial direction. That is, the interlocking shaft 31 is pushed and pulled in the axial direction D3 in conjunction with the swinging operation of the lever (operating member) 80 .
  • an outer shaft body 31A of the interlocking shaft 31 is provided on the other end side (the other end side in the axial direction) 35B of the interlocking shaft 31 in the axial direction (also referred to as the interlocking shaft axial direction) D3, an outer shaft body 31A of the interlocking shaft 31 is provided on the other end side (the other end side in the axial direction) 35B of the interlocking shaft 31 in the axial direction (also referred to as the interlocking shaft axial direction) D3, an outer shaft body 31A of the interlocking shaft 31 is provided on the axial direction (also referred to as the interlocking shaft axial direction) D3, an outer shaft body 31A of the interlocking shaft 31 is provided on the axial direction (also referred to as the interlocking shaft axial direction) D3, an outer shaft body 31A of the interlocking shaft 31 is provided on the axial direction (also referred to as the interlocking shaft axial direction) D3, an outer shaft body 31A of the interlocking shaft 31 is provided on the axial
  • the interlocking shaft 31 has an end portion 38 on the other end side 35B in the axial direction.
  • the end portion 38 is formed by a bolt and screwed into the screw hole 37 to be attached to the small diameter portion 31B and the shaft main body 31A.
  • the rotation axis X2 is parallel to the direction perpendicular to the axis X3 of the interlocking shaft 31 .
  • the housing member 32 supports the interlocking shaft 31 so as to be movable in the axial direction D3, and supports the interlocking shaft 31 so that one end side of the interlocking shaft 31 (one end side 35A in the axial direction) protrudes.
  • the housing member 32 supports the interlocking shaft 31 movably in a protruding direction D4 in which the interlocking shaft 31 protrudes from the housing member 32 and in a retracting direction D5 opposite to the protruding direction D4. .
  • the housing member 32 has a supported portion 39 on one axial end side 35A of the interlocking shaft 31 and a spring accommodating portion 40 on the other axial end side 35B of the interlocking shaft 31 .
  • the supported portion 39 and the spring accommodating portion 40 are formed separately.
  • the supported portion 39 has a through hole 46 formed through in the interlocking shaft center direction D3.
  • a shaft main body 31A of the interlocking shaft 31 is inserted through the through hole 46, and is supported by the supported portion 39 via a bush 47 fitted to the inner surface of the through hole 46 so as to be movable in the axial direction D3.
  • One end side (one end side 35A in the axial direction) of the through-hole 46 is formed as a projection port 48 from which the interlocking shaft 31 projects. Therefore, the supported portion 39 is provided between the spring accommodating portion 40 and the projecting opening 48 .
  • a dust seal 49 is provided on the protruding port 48 side of the bush 47 .
  • the supported portion 39 is formed with a bearing portion 50 and a coupling portion 51 .
  • the bearing portion 50 includes a first bearing portion 50A and a second bearing portion 50B integrally extending from a body portion 39A of the supported portion 39, which is a portion in which the through hole 46 is formed.
  • the first bearing portion 50A extends in a direction D6 perpendicular to the axial center X3 of the interlocking shaft 31.
  • the first bearing portion 50A has a first support hole 52A formed from the extended end toward the main body portion 39A.
  • the second bearing portion 50B extends in a direction D7 perpendicular to the axial center X3 of the interlocking shaft 31 and opposite to the direction D6 in which the first bearing portion 50A extends.
  • the second bearing portion 50B has a second support hole 52B formed from the extended end toward the main body portion 39A.
  • 52 A of 1st support holes and the 2nd support hole 52B are axial centers of the direction orthogonal to the axial center X3 of the interlocking shaft 31, and have a concentric axial center.
  • the supported portion 39 is pivotally supported by the bracket member 53 .
  • the bracket member 53 has a top wall 53a, a first side wall 53b extending downward from one side of the top wall 53a, and a second side wall 53c extending downward from the other side of the top wall 53a.
  • the upper wall 53 a is arranged above the supported portion 39 and one axial end side 35 A of the interlocking shaft 31 , and protrudes downward from the wall portion 54 positioned above the bracket member 53 . It is attached to the portion 55 by bolts 56 .
  • the first side wall 53b extends from the upper wall 53a toward the first bearing portion 50A and has a first pivot wall 53d located on the side of the first bearing portion 50A.
  • a first bearing portion 50A is pivotally supported on the first pivot wall 53d by a first pivot pin 57A which penetrates the first pivot wall 53d and is inserted into the first support hole 52A.
  • the second side wall 53c extends from the upper wall 53a toward the second bearing portion 50B and has a second pivot wall 53e located on the side of the second bearing portion 50B.
  • the second bearing portion 50B is pivotally supported on the second pivot wall 53e by a second pivot pin 57B that penetrates the second pivot wall 53e and is inserted into the second support hole 52B.
  • the first pivot pin 57A and the second pivot pin 57B have an axis X4 parallel to the rotation axis X2. That is, the supported portion 39 is supported by the bracket member 53 so as to be rotatable about an axis parallel to the axis of the rotation shaft 27 (rotation axis X2). As shown in FIG. 3, the first pivot pin 57A and the second pivot pin 57B are retained by retaining members 58. As shown in FIG.
  • a pair of coupling portions 51 are provided.
  • One coupling portion 51 extends in a direction perpendicular to the axial center of the interlocking shaft 31 .
  • the other coupling portion 51 extends in a direction orthogonal to the axis X3 of the interlocking shaft 31 and opposite to the direction in which the one coupling portion 51 extends.
  • each coupling portion 51 is formed with a screw hole 51a.
  • the spring housing portion 40 has a cylindrical housing hole 59 that is concentric with the axis X3 of the interlocking shaft 31 .
  • the accommodation hole 59 is formed in a bottomed cylindrical shape with one axial end 35A of the interlocking shaft 31 open and the other axial end 35B closed.
  • the housing hole 59 communicates with the through hole 46 of the supported portion 39 , and the other axial end side of the interlocking shaft 31 is inserted into the housing hole 59 .
  • the spring accommodating portion 40 has a pair of connecting portions 60 corresponding to the connecting portions 60 of the supported portion 39 .
  • a threaded hole 60 a is formed through the joint portion 60 .
  • the connecting portion 51 and the connecting portion 60 are screwed together by screwing the bolts 61 into the screw holes 51a and 60a, thereby connecting the supported portion 39 and the spring housing portion 40 together.
  • the neutral return spring 33 is housed in a housing hole 59 (inside the housing member 32).
  • the neutral return spring 33 is formed by a compression coil spring and is concentrically housed in the housing hole 59 . That is, the neutral return spring 33 is accommodated in the housing member 32 along the interlocking shaft center direction D3.
  • a first spring bearing member 62 and a second spring bearing member 63 that receive the load of the neutral return spring 33 are accommodated in the accommodation hole 59 .
  • the first spring receiving member 62 and the second spring receiving member 63 are housed in the spring housing portion 40 with a space therebetween in the interlocking shaft center direction D3.
  • the neutral return spring 33 is interposed between the first spring bearing member 62 and the second spring bearing member 63 .
  • the first spring receiving member 62 includes a cylindrical portion 62a arranged on the outer peripheral side of the shaft body 31A of the interlocking shaft 31 and a first spring receiving member 62a extending radially outward from one end side of the cylindrical portion 62a and abutting on the supported portion 39.
  • first spring receiving member 62 is restricted from moving in the protruding direction D4 by the supported portion 39 and moves integrally with the interlocking shaft 31 in the retreating direction D5.
  • the second spring receiving member 63 includes a cylindrical portion 63a arranged outside the head portion 38a of the end portion 38 and a flange portion 38b of the end portion 38 extending radially inward from one end side of the cylindrical portion 63a. and a second portion 63c extending radially outward from the other end side of the cylindrical portion 63a and abutting against the spring accommodating portion 40.
  • the movement of the second spring receiving member 63 in the retracting direction D5 is restricted by the portion (spring accommodating portion 40) on the housing member 32 side, and the second spring receiving member 63 moves integrally with the end portion 38 (interlocking shaft 31) in the protruding direction D4.
  • the interlocking shaft 31 is in the initial position (interlocking shaft 31 neutral position) P4.
  • the interlocking shaft 31 is arranged such that the axis X3 extends in the horizontal direction.
  • the lever 80 is operated from the neutral position P1 to the first operation position P2
  • the interlocking shaft 31 moves from the initial position P4 to the first movement position (movement position) P5, which is the position operated by the lever 80.
  • the second spring receiving member 63 moves together with the end portion 38 (interlocking shaft 31) in the projecting direction D4, and the neutral return spring 33 is compressed.
  • the interlocking shaft 31 moves from the initial position P4 to the second movement position (movement position) P6, which is the position operated by the lever 80.
  • the first spring receiving member 62 moves together with the stepped portion 64 (the interlocking shaft 31) in the retreating direction D5, and the neutral return spring 33 is compressed.
  • An operation load is applied to the lever 80 by compressing the neutral return spring 33 . Further, by adopting (replacing) the neutral return spring 33 having a different load, the operating load of the lever 80 can be changed.
  • the interlocking shaft 31 is moved from the movement position (first movement position P5 or second movement position P6) to the initial position by the biasing force of the neutral return spring 33. Return to position P4.
  • the stroke H1 between the initial position P4 and the first movement position P5 and the stroke H2 between the initial position P4 and the second movement position P6 are obtained when the interlocking shaft 31 is at the initial position P4, for example. It is set to be substantially the same as the interval H3 between the second portion 62c and the first portion 63b.
  • the neutral return mechanism 26 configured as described above, as shown in FIG. 1, the axial length L1 of the interlocking shaft 31 in the supported portion 39 is equal to the neutral return length when the interlocking shaft 31 is at the initial position P4.
  • the length L2 of the spring 33 in the axial direction D3 of the interlocking shaft is formed smaller than the length L2, and the neutral return mechanism 26 is formed compactly.
  • the length L3 of the supported portion 39 in the interlocking shaft center direction D3 is formed to be smaller than the length L4 of the spring accommodating portion 40 in the interlocking shaft center direction D3.
  • a stay member is fixed to the other axial end side 35B of the interlocking shaft 31 in the spring accommodating portion 40, and this stay member is attached to the wall portion 54. If it is configured to pivotally support the attached bracket member, the neutral return mechanism 26 becomes large in the interlocking shaft center direction D3.
  • the supported portion 39 pivotally supported by the bracket member 53 attached to the wall portion 54 is provided between the spring housing portion 40 and the projecting port 48, so that the neutral return mechanism is provided. 26 can be made compact.
  • the supported portion 39 is pivotally supported by the bracket member 53 (supported so as to be rotatable about the axis X4).
  • the support portion 39 may be fixedly supported (non-rotatably supported) by the bracket member 53 .
  • the connecting pin 36 formed on the interlocking arm 29 is inserted so that the interlocking shaft 31 moves linearly with the movement of the interlocking arm 29 about the rotation axis X2.
  • a pin insertion hole is formed in the oblong hole.
  • FIG. 5 shows a second embodiment of the neutral return mechanism 26.
  • the end portion 38 and the small diameter portion 31B are integrally formed, the small diameter portion 31B is formed separately from the shaft main body 31A, and the screw shaft is integrally formed with the small diameter portion 31B.
  • the small-diameter portion 31B and the end portion 38 are attached to the shaft body 31A by screwing the portion 65 into a screw hole 66 formed in the shaft body 31A.
  • the end portion 38 is formed in a columnar shape having an outer diameter larger than that of the small-diameter portion 31B, and has an outer diameter substantially equal to that of the shaft body 31A.
  • a first portion 63b of the second spring receiving member 63 is engaged with a step portion 67 between the small diameter portion 31B and the end portion 38.
  • a housing chamber 68 is formed in the end portion 38 .
  • the accommodation chamber 68 is formed by drilling a hole extending in the axial direction D3 from the other axial end 35B of the interlocking shaft 31 to the one axial end 35A.
  • the housing chamber 68 includes a first housing chamber 68A on one axial end side 35A of the interlocking shaft 31 and a second housing chamber 68B on the other axial end side 35B of the interlocking shaft 31 .
  • the first storage chamber 68A is formed by a hole with a diameter smaller than that of the second storage chamber 68B.
  • the end portion 38 has a through portion 69 that penetrates the inner surface of the second storage chamber 68B and the outer surface of the end portion 38 in the radial direction.
  • a detent mechanism 70 is housed in the housing chamber 68 (end portion 38).
  • the detent mechanism 70 has a range of strokes H1 and H2 of the interlocking shaft 31, which is a range in which the interlocking shaft 31 automatically returns from the movement position (first movement position P5, second movement position P6) to the initial position P4 by the neutral return spring 33.
  • the interlocking shaft 31 is held outside at the operated position.
  • the detent mechanism 70 has a detent ball 71 , a pressure ball 72 and a biasing member 73 .
  • the detent ball 71 is housed in the second housing chamber 68B. Specifically, the detent ball 71 is arranged at a position corresponding to the through portion 69 and is movable in the radial direction of the end portion 38 (interlocking shaft 31). In the second embodiment, a plurality of (four) through portions 69 are formed at equal intervals in the circumferential direction of the end portion 38 . A plurality (four) of detent balls 71 are also provided corresponding to the four through portions 69 .
  • the pressing ball 72 is arranged between the detent ball 71 and the first accommodating chamber 68A in the second accommodating chamber 68B.
  • the pressing ball 72 is formed in a size capable of pressing the four detent balls 71 .
  • the biasing member 73 is formed of a coil spring and housed in the first housing chamber 68A to bias the pressing ball 72 .
  • the biasing force of the biasing member 73 acts in the direction in which the pressing ball 72 presses the detent ball 71 . That is, the pressing ball 72 presses the detent ball 71 radially outward of the interlocking shaft 31 by the biasing force of the biasing member 73 .
  • the spring accommodating portion 40 includes an accommodating portion main body 40A and a sleeve 40B accommodated in the accommodating portion main body 40A.
  • the accommodation portion main body 40A has an opening portion 74 on the other end side 35B of the interlocking shaft 31 in the axial direction.
  • the sleeve 40B is inserted into the housing main body 40A through the opening 74 and is retained by a spacer 75 and a retaining member (snap ring) 79.
  • the second portion 63c of the second spring receiving member 63 contacts the sleeve 40B (the portion on the housing member 32 side), thereby restricting movement in the retraction direction D5.
  • a tapered portion 88, a positioning protrusion 89, and an engaging recess 90 are provided on the inner peripheral side of the sleeve 40B.
  • the tapered portion 88, the positioning projection 89, and the engaging recess 90 are formed near the one end side 35A of the interlocking shaft 31 from the middle portion of the sleeve 40B in the axial direction.
  • the tapered portion 88 is formed in a tapered shape that gradually increases in diameter from the other end 35B in the axial direction of the interlocking shaft 31 toward the one end 35A (positioning projection 89).
  • the positioning protrusion 89 is formed as a protruding line protruding toward the inner peripheral side of the sleeve 40B and formed in the circumferential direction of the sleeve 40B.
  • the engaging recess 90 is formed by a circumferential groove formed in the inner circumference of the sleeve 40B in the circumferential direction.
  • the detent ball 71 is provided in the spring accommodating portion 40 so as to protrude outward in the radial direction of the interlocking shaft 31 from the end portion 38 outside the range of the strokes H1 and H2, which are the ranges of automatic return by the neutral return spring 33. It can be held at the position (detent position P7) where the interlocking shaft 31 is operated by engaging with the engaging recess 90 .
  • the distance between the second portion 62c of the first spring receiving member 62 and the first portion 63b of the second spring receiving member 63 when the interlocking shaft 31 is at the initial position P4 is
  • the interval H5 is set substantially equal to the stroke H4 between the initial position P4 and the detent position P7.
  • the lever 80 is operated to the second operating position P3 to move the interlocking shaft 31 to the second movement position P6, the detent ball 71 moves the cylindrical portion of the inner peripheral surface of the sleeve 40B toward the axial center of the interlocking shaft 31. It moves to the other end side 35B.
  • FIG. 6 and 7 show the working machine 1 employing the neutral return mechanism 26.
  • FIG. FIG. 6 is a schematic plan view showing the overall configuration of work machine 1.
  • FIG. 7 is a perspective view of the operating portion of the working machine 1.
  • a backhoe which is a turning work machine, is exemplified as the work machine 1 .
  • the working machine 1 includes a machine body (swivel base) 2 , a traveling device 3 , and a working device 4 .
  • a cabin 5 is mounted on the airframe 2 .
  • a driver's seat 6 on which a driver (operator) sits is provided inside the cabin 5 .
  • the direction toward the front of the driver seated in the driver's seat 6 of the working machine 1 (the direction of arrow A1 in FIG. 6) is the front, and the direction toward the rear of the driver (the direction of arrow A2 in FIG. 6). 6 is the rearward direction
  • the direction of arrow K1 in FIG. 6 is the longitudinal direction
  • the left side of the driver (the front side in FIG. 6) is the left side
  • the right side of the driver (back side in FIG. 6) is the right side.
  • the horizontal direction, which is the direction orthogonal to the longitudinal direction K1 will be described as the body width direction (the width direction of the body 2).
  • the traveling device 3 has a traveling frame 3A, a first traveling device 3L provided on the left side of the traveling frame 3A, and a second traveling device 3R provided on the right side of the traveling frame 3A.
  • the first travel device 3L is driven by the first travel motor M1
  • the second travel device 3R is driven by the second travel motor M2.
  • the first traveling motor M1 and the second traveling motor M2 are configured by hydraulic motors (hydraulic actuators).
  • a dozer device 7 is attached to the front portion of the travel device 3 .
  • the dozer device 7 has a dozer arm 7A whose rear portion is pivotally supported by the travel frame 3A and which can swing vertically, and a dozer blade 7B provided at the front portion of the dozer arm 7A.
  • the dozer device 7 can be moved up and down (raising and lowering the dozer blade 7B) by extending and contracting a dozer cylinder (hydraulic actuator).
  • the machine body 2 is supported on the travel frame 3A via a swivel bearing 8 so as to be swivelable around the swivel axis X1.
  • a support bracket 20 is provided in the front part of the machine body 2, and a swing bracket 21 is supported by the support bracket 20 so as to be rotatable about a vertical axis (an axis extending in the vertical direction).
  • the work device 4 has a boom 22 , an arm 23 and a bucket (work tool) 24 .
  • the base of the boom 22 is pivotally attached to the upper portion of the swing bracket 21 so as to be rotatable about a horizontal axis (an axis extending in the width direction of the machine body).
  • the arm 23 is pivotally attached to the tip side of the boom 22 so as to be rotatable about the horizontal axis.
  • the bucket 24 is provided on the tip side of the arm 23 so as to be able to scoop and dump.
  • the scooping operation is an operation for swinging the bucket 24 in a direction to bring it closer to the boom 22, and is an operation for scooping up earth and sand, for example.
  • a dumping operation is an operation for swinging the bucket 24 in a direction away from the boom 22, and is an operation for dropping (discharging) scooped earth and sand, for example.
  • the work machine 1 can be equipped with other work implements (hydraulic attachments) that can be driven by hydraulic actuators.
  • Other working tools include hydraulic breakers, hydraulic crushers, angle blooms, earth augers, pallet forks, sweepers, mowers, snow blowers, and the like.
  • the swing bracket 21 is swingable by extension and contraction of a swing cylinder C2 provided on the body 2.
  • the boom 22 is swingable by extension and contraction of the boom cylinder C3.
  • the arm 23 can swing by extension and contraction of the arm cylinder C4.
  • the bucket 24 is capable of squeezing and dumping by extension and contraction of the bucket cylinder C5.
  • the swing cylinder C2, boom cylinder C3, arm cylinder C4, and bucket cylinder C5 are hydraulic cylinders (hydraulic actuators).
  • a control device 41 is provided inside the cabin 5 .
  • the control device 41 is provided in front of the driver's seat 6 .
  • the driver's seat 6 and the operating device 41 constitute an operating section 42 for operating the working machine 1 (manipulating the machine body 2, traveling device 3, working device 4, swing bracket 21, etc.).
  • the driver's seat 6 is supported by a floor portion 5B forming the bottom portion of the cabin 5 via a seat base 76 and the like.
  • a suspension device 77 is provided on the seat base 76
  • the driver's seat 6 is provided on the suspension device 77 via slide rails 78 so that the front-rear position thereof can be adjusted.
  • the operating device 41 has a control stand 81, an operating member 82, a monitor 84, a travel pedal 85, a lever 80, and the like.
  • the control table 81 is provided in front of the driver's seat 6 on the fuselage 2, and includes a base 86 erected on the floor 5B (fuselage 2) and a control table body 87 arranged above the base 86.
  • the control member 82 is a member that is gripped and operated by the driver, and is attached to the control base main body 87 (control base 81).
  • the steering member 82 includes a first steering handle 82L and a second steering handle 82R arranged side by side in the machine width direction. The first steering handle 82L and the second steering handle 82R can perform, for example, a turning operation of the machine body 2, a swinging operation of the boom 15, a swinging operation of the arm 23, and a swinging operation of the bucket 24.
  • the control table body 87 has armrests 93 provided on the left and right sides of the control table body 87 .
  • the first armrest 93L which is the left armrest 93, has an armrest base 93L1 and an armrest main body 93L2 pivotally supported at the rear of the armrest base 93L1.
  • the second armrest 93R which is the right armrest 93, has an armrest base 93R1 and an armrest main body 93R2 integrally formed with the armrest base 93R1.
  • the armrest main body 93L2 and the armrest main body 93R2 have an elbow rest portion 93A on which the driver's elbow is placed at the rear.
  • a lever 80 is a dozer lever 80 for manipulating the dozer device 7 .
  • the dozer lever 80 can be swung forward (in one direction D1) and backward (in the other direction D2) from the neutral position P1.
  • the neutral return mechanism 26 of the first and second embodiments is employed to return the dozer lever 80 to the neutral position P1.
  • the second armrest 93R is formed hollow, and the neutral return mechanism 26 and the rotating shaft 27 are housed inside an armrest base portion 93R1 of the second armrest 93R.
  • the wall portion 54 to which the neutral return mechanism 26 and the rotating shaft 27 are attached is the upper wall of the second armrest 93R.
  • the neutral return mechanism 26 can be used to return the travel pedal 85 to the neutral position. Further, the neutral return mechanism 26 can be used to return the swing pedal that swings the swing bracket 21 to the neutral position. Also, the neutral return mechanism 26 can be employed to return to a neutral position an AUX pedal that operates a hydraulic attachment mounted in place of or in addition to the bucket 24 . It may also be used to return other levers and pedals to their neutral positions.
  • the dozer control valve is provided with a floating position for lowering the dozer blade 7B by its own weight (permitting free expansion and contraction of the hydraulic cylinder for vertically moving the dozer arm 7A).
  • the dozer control valve is switched to the floating position by moving the interlocking shaft 31 to the detent position P7. That is, by holding the interlocking shaft 31 at the detent position P7, the dozer control valve can be held at the floating position.
  • the neutral return mechanism 26 of the present embodiment is capable of swinging from the neutral position P1 in one direction D1 and in the other direction D2, which is the opposite direction to the one direction D1, and operates the control valve V1 that hydraulically controls the hydraulic actuator C1.
  • the neutral return mechanism 26 for returning the member 80 to the neutral position P1 includes an interlocking shaft 31 that is pushed and pulled in the axial direction D3 interlocking with the swinging operation of the operating member 80, and the interlocking shaft 31 that extends in the axial direction D3.
  • a housing member 32 that movably supports the interlocking shaft 31 and accommodates the interlocking shaft 31 so that one end of the interlocking shaft 31 protrudes; 2) a neutral return spring 33 that returns from the movement position P6) to the initial position P4 before being operated, the neutral return spring 33 being accommodated in the housing member 32 along the axial direction D3 of the interlocking shaft 31;
  • the housing member 32 has a supported portion 39 supported by the bracket member 53 between the spring accommodating portion 40 that accommodates the neutral return spring 33 and the projecting opening 48 from which the interlocking shaft 31 projects.
  • the neutral return spring 33 is provided in the housing member 32 to return the interlocking shaft 31, which is pushed and pulled in the axial direction D3 in conjunction with the swinging operation of the operating member 80, from the movement positions P5 and P6 to the initial position P4.
  • a supported portion 39 is accommodated in the housing member 32 along the axial direction of the interlocking shaft 31 and is supported by the bracket member 53 between the spring accommodating portion 40 and the projecting opening 48 from which the interlocking shaft 31 protrudes.
  • interlocking shaft 31 is interlocked with the swinging motion of the operating member 80 and rotates around the axis X2 parallel to the direction orthogonal to the axis X3 of the interlocking shaft 31.
  • the supported portion 39 is attached to the bracket member 53 around the axis X4 parallel to the axis of the rotating shaft 27. It has a bearing portion 50 that is rotatably supported.
  • the neutral return mechanism 26 can follow the movement of the interlocking arm 29 around the rotation shaft 27 . Further, the axial length L1 of the interlocking shaft 31 in the supported portion 39 is longer than the length L2 of the interlocking shaft 31 of the neutral return spring 33 in the axial direction D3 when the interlocking shaft 31 is at the initial position P4. small.
  • the housing member 32 can be formed compactly, and the neutral return mechanism 26 can be formed compactly.
  • a first spring receiving member 62 and a second spring receiving member 62 are accommodated in the spring accommodating portion 40 with a space therebetween in the axial direction D3 of the interlocking shaft 31, and a neutral return spring 33 constituted by a coil spring is interposed therebetween.
  • the interlocking shaft 31 has an end portion 38 provided on the other end side opposite to the one end side of the interlocking shaft 31 , and the first spring receiving member 62 is supported by the supported portion 39 to 31 is restricted from moving in the projecting direction D4, which is the direction in which the second spring receiving member 63 projects from the housing member 32, and moves integrally with the interlocking shaft 31 in the retreating direction D5, which is the opposite direction to the projecting direction D4.
  • the movement in the retreating direction D5 is restricted by the parts on the housing member 32 side (the spring accommodating portion 40 and the sleeve 40B), and the end portion 38 and the end portion 38 move integrally in the protruding direction D4.
  • the neutral return spring 33 can be compactly housed in the spring accommodating portion 40 . Further, the interlocking shaft 31 is moved outside the range of the strokes H1 and H2 of the interlocking shaft 31, which is the range in which the interlocking shaft 31 is automatically returned by the neutral return spring 33 from the moving position operated by the operating member 80 to the initial position P4 before being operated. It has a detent mechanism 70 that holds the 31 at the operated position (detent position P7).
  • the operation member 80 can be held outside the range of the strokes H1 and H2 of the interlocking shaft 31 automatically returned by the neutral return spring 33 .
  • the detent mechanism 70 has a detent ball 71, a pressing ball 72, and a biasing member 73 which are housed in the end portion 38 on the other end side of the interlocking shaft 31.
  • the detent ball 71 extends radially of the interlocking shaft 31.
  • the interlocking shaft 31 is operated by being movable and protruding radially outwardly of the interlocking shaft 31 from the end portion 38 outside the range of the strokes H1 and H2 and engaging with an engagement recess 90 provided in the spring accommodating portion 40 .
  • the pressing ball 72 presses the detent ball 71 radially outward of the interlocking shaft 31 by the biasing force of the biasing member 73 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Control Devices (AREA)
PCT/JP2021/047462 2021-01-27 2021-12-22 中立復帰機構 Ceased WO2022163225A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2022578158A JP7612719B2 (ja) 2021-01-27 2021-12-22 中立復帰機構
CN202180081619.8A CN116710617A (zh) 2021-01-27 2021-12-22 中立返回机构
EP21923228.7A EP4286602A4 (en) 2021-01-27 2021-12-22 NEUTRAL RETURN MECHANISM
US18/205,190 US12066852B2 (en) 2021-01-27 2023-06-02 Neutral return mechanism

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-010774 2021-01-27
JP2021010774 2021-01-27

Related Child Applications (1)

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US18/205,190 Continuation US12066852B2 (en) 2021-01-27 2023-06-02 Neutral return mechanism

Publications (1)

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WO2022163225A1 true WO2022163225A1 (ja) 2022-08-04

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EP (1) EP4286602A4 (https=)
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WO (1) WO2022163225A1 (https=)

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CN116529440B (zh) 2021-01-27 2025-11-21 株式会社久保田 操纵机构以及作业机

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JPH0737213B2 (ja) * 1988-05-14 1995-04-26 株式会社クボタ 作業車の走行用操作構造
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JPS4947159Y1 (https=) * 1969-04-16 1974-12-24
JPS597977U (ja) * 1982-07-09 1984-01-19 株式会社ボッシュオートモーティブ　システム 手動切換弁の抑留装置
JPS6185760U (https=) * 1984-11-09 1986-06-05
JP2013238256A (ja) * 2012-05-11 2013-11-28 Kubota Corp 作業車
JP2015022642A (ja) 2013-07-22 2015-02-02 株式会社クボタ 操作レバー
WO2019039546A1 (ja) * 2017-08-24 2019-02-28 株式会社Ihi 遠隔操作装置

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See also references of EP4286602A4

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JPWO2022163225A1 (https=) 2022-08-04
JP7612719B2 (ja) 2025-01-14
US12066852B2 (en) 2024-08-20
CN116710617A (zh) 2023-09-05
EP4286602A1 (en) 2023-12-06
US20230324944A1 (en) 2023-10-12
EP4286602A4 (en) 2025-01-08

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