WO2015019944A1 - Travel vehicle - Google Patents

Travel vehicle Download PDF

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Publication number
WO2015019944A1
WO2015019944A1 PCT/JP2014/070245 JP2014070245W WO2015019944A1 WO 2015019944 A1 WO2015019944 A1 WO 2015019944A1 JP 2014070245 W JP2014070245 W JP 2014070245W WO 2015019944 A1 WO2015019944 A1 WO 2015019944A1
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WO
WIPO (PCT)
Prior art keywords
pedal
differential lock
differential
lock pin
base end
Prior art date
Application number
PCT/JP2014/070245
Other languages
French (fr)
Japanese (ja)
Inventor
芳照 大茂
東口　岳
史洋 江川
健治 渡部
Original Assignee
ヤンマー株式会社
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Publication date
Application filed by ヤンマー株式会社 filed Critical ヤンマー株式会社
Publication of WO2015019944A1 publication Critical patent/WO2015019944A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • B60K2023/046—Axle differential locking means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/20—Off-Road Vehicles
    • B60Y2200/22—Agricultural vehicles
    • B60Y2200/221—Tractors

Definitions

  • the present invention relates to a traveling vehicle such as a tractor for towing a ground working machine such as a rotary tiller, and more particularly, a differential gear mechanism that drives left and right rear wheels, and a differential lock that locks the differential gear mechanism.
  • the present invention relates to a traveling vehicle including a pedal.
  • Patent Document 1 Conventionally, when a traveling vehicle such as a tractor travels on a road such as a farm road, the diff lock pedal is stepped on, the differential lock pin of the differential gear mechanism is engaged, and the differential drive of the left and right rear wheels is stopped.
  • Patent Document 1 there is a technique for reducing the meandering traveling of the traveling vehicle.
  • the differential lock pedal when the differential lock mechanism is engaged with the differential gear mechanism by the stepping operation of the differential lock pedal, the differential lock pedal is supported at the initial step position when the differential lock pin is not in the engaged position. That is, even if the diff lock pedal is stepped on, there is a problem that the operator needs to maintain a high stepping position until the diff lock pin is engaged, and the step operability of the diff lock pedal cannot be improved. In addition, since the operator cannot visually confirm the engagement of the diff lock pin, even if the operator steps on the diff lock pedal, the operator releases the foot from the diff lock pedal before the diff lock pin is engaged, and the diff lock pedal operation is inappropriate. Sometimes it is done.
  • the present invention seeks to provide a traveling vehicle that has been improved by examining these current conditions.
  • a traveling vehicle includes a traveling machine body on which an engine is mounted, a transmission case that transmits power of the engine to left and right traveling units, and a transmission case.
  • a traveling vehicle comprising a differential gear mechanism and a differential lock pin that releasably locks the differential transmission operation of the differential gear mechanism
  • a step pedal for engaging and disengaging the differential lock pin is provided, the step pedal
  • the pedal is formed by a pedal base end portion connected to the differential lock pin side and a pedal operation portion that an operator steps on, and the pedal operation portion is connected to the pedal base end portion in a foldable manner.
  • a backward moving means for repressing the pedal operation portion in an unfolded state with respect to the pedal base end portion.
  • the pedal operation portion is bent with respect to the pedal base end portion by the stepping operation of the pedal operation portion, and the differential lock pin
  • the differential lock pin is maintained in the engaged operation state by the return spring force that connects the pedal base end portion and the pedal operation portion to the non-bent state when the pedal is supported at the non-engagement position. It is composed.
  • a traveling vehicle having a differential lock pin for releasably locking the differential transmission operation of the dynamic gear mechanism a step pedal for engaging and disengaging the differential lock pin is provided, and the foot pedal is disposed on the differential lock pin side.
  • the pedal operation portion When the differential gear mechanism is engaged with the differential lock mechanism in the stepping operation of the foot pedal, the pedal operation portion is supported at the foot position even when the differential lock pin is not in the engagement position. Until the differential lock pin is engaged, the operator does not need to maintain a high stepping position, and the stepping operability of the stepping pedal can be improved. In addition, since the stepping operation state of the pedal operation unit can be easily continued, the problem that the stepping pedal operation is improperly performed can be reduced, and the differential lock mechanism can be properly engaged with the differential gear mechanism.
  • the pedal operation portion since the return operation means is provided to repress the pedal operation portion in a non-bending state with respect to the pedal base end portion, the pedal operation portion is operated by stepping.
  • the differential lock pin can be smoothly shifted from the disengaged state to the engaged state.
  • the pedal operation portion is bent with respect to the pedal base end portion by the stepping operation of the pedal operation portion, and the differential lock pin is supported at the non-engagement position.
  • the differential lock pin is maintained in the engagement operation state by the return spring force that connects the pedal base end portion and the pedal operation portion to the non-bending state.
  • the posture of the pedal operation portion with respect to the pedal base end portion can be smoothly returned from the bent state to the non-bent state.
  • FIG. 7 is an enlarged explanatory view of FIG. 6. It is a right view of a foot pedal part.
  • FIG. 9 is an operation explanatory diagram of FIG. 8. It is decomposition
  • FIG. 1 is a side view of a farm tractor and a rotary tiller
  • FIG. 2 is a plan view thereof.
  • the left side in the forward direction of the traveling machine body 1 is simply referred to as the left side
  • the right side in the forward direction is also simply referred to as the right side.
  • the traveling machine body 2 in the tractor 1 is supported by a pair of left and right front wheels 3 and a pair of left and right rear wheels 4.
  • the rear wheels 4 and the front wheels 3 are driven by a diesel engine 5 mounted on the front part of the traveling machine body 2 so that the tractor 1 travels forward or backward.
  • the upper side of the diesel engine 5 is covered with an openable / closable bonnet 6.
  • a driving unit 7 is installed behind the hood 6 on the upper surface of the traveling machine body 2.
  • a control seat 8 on which an operator sits and a control handle 9 for steering the front wheel 3 are installed in the driving unit 7.
  • the driving unit 7 is provided with a boarding step 10 on which an operator boards.
  • a boarding / alighting step 11 on which the operator gets on / off is provided on the left side of the boarding step 10.
  • the traveling machine body 2 includes an engine frame 14 having a front bumper 12 and a front axle case 13, a clutch housing 15 fixed to the rear portion of the diesel engine 5, and a transmission case 16. Is done.
  • the rotation of the diesel engine 5 is changed by the transmission case 16 and transmitted to the rear wheel 4 or the front wheel 3.
  • the rear axle case 17 is projected outward from the left and right side surfaces of the transmission case 16, and the rear wheel 4 is attached to the rear axle case 17.
  • the rear axle case 17 is provided with a rops frame 18 standing, and a fuel tank 19 is mounted between the control seat 8 on the front upper surface of the transmission case 16 and the rops frame 18.
  • a hydraulic lifting mechanism 20 for lifting and lowering a rotary tiller 24 as a ground working machine is mounted on the upper surface of the rear portion of the mission case 16.
  • a three-point link mechanism 23 including a pair of left and right lower links 21 and a top link 22 is provided at the rear part of the mission case 16, and the rotary tiller 24 is mounted on the mission case 16 via the three-point link mechanism 23 so as to be movable up and down.
  • the front end sides of the left and right lower links 21 are rotatably connected to the left and right side surfaces of the rear portion of the mission case 16 via lower link pins 25.
  • the front end side of the top link 22 is connected to a top link hitch 26 at the rear of the hydraulic lifting mechanism 20 via a top link pin 27. Further, a PTO shaft 28 that transmits the PTO driving force to the rotary tiller 24 is provided, and the PTO shaft 28 is provided so as to protrude rearward from the rear side surface of the transmission case 16.
  • the hydraulic lifting mechanism 20 is provided with a pair of left and right lift arms 29.
  • the lower link 21 and the lift arm 29 on the left side in the traveling direction are connected via a left lift rod 30.
  • the lower link 21 and the lift arm 29 on the right side in the traveling direction are connected via a double-acting hydraulic rolling cylinder 32 and a piston rod 33 that form a right lift rod.
  • the rotary cultivator 24 includes a horizontally long main beam 36, a chain case 37 and a bearing plate 38 each having an upper end connected to left and right ends of the main beam 36, and a chain case 37 and a bearing plate 38.
  • a tilling claw shaft 39 whose left and right end portions are rotatably supported on the lower end side thereof, a plurality of tilling claws 40 attached to the tilling claw shaft 39 in a detachable manner radially,
  • a tilling top cover 41 arranged so as to cover the upper side of the rotation trajectory, a left and right tilling side cover 42 arranged so as to cover the left and right sides of the rotation trajectory of the tilling claw 40, and a rear side of the rotation trajectory of the tilling claw 40.
  • the tilling depth adjusting handle 45 by manually operating the tilling depth adjusting handle 45, the ground posture of the rotary tiller 24 is changed to the forward tilting posture or the backward tilting posture, so that the tilling depth by the tilling claws 40 can be changed.
  • the power from the PTO shaft 23 is transmitted to the tilling claw shaft 39, and the tilling claw 40 is rotated counterclockwise in FIG. 1 to plow the cultivated soil in the field.
  • a steering column 60 on which the steering handle 9 is disposed is provided, and a left and right brake pedal 61 is disposed on the lower right side of the steering column 60.
  • a traveling clutch pedal 62 is disposed below the left side of the steering column 60.
  • a travel auxiliary transmission lever 65 is arranged on the left side of the control seat 8.
  • a differential lock pedal 66 that locks the differential drive of the left and right rear wheels 4 is disposed in front of the right side of the control seat 8.
  • a rolling sensor 67 having a pendulum structure that detects the left-right tilt of the traveling machine body 2 is disposed.
  • the differential gear mechanism 160 includes a ring gear 161 for transmitting the driving force of the diesel engine 5, a frame body 162 fixed to the ring gear 161, left and right side gears 163 provided in the frame body 162, A pinion gear 164 for connecting the side gear 163 is provided.
  • the left and right side gears 163 are pivotally supported on the left and right rear axles 175 for driving the left and right rear wheels 4.
  • the differential gear mechanism 160 also includes a differential lock pin 165 that locks the side gear 163 to the frame 162, a differential lock shifter 166 that provides the differential lock pin 165, and a lock pin engagement / disengagement operation that slides the differential lock shifter 166 on the rear axle 175.
  • a differential lock fork 167 as a mechanism, and a differential lock shaft 168 for slidably supporting a fork boss portion 167a of the differential lock fork 167 are provided.
  • the left and right end portions of the differential lock shaft 168 are supported by the left and right bearing portions 17b (inside the transmission case 16) of the rear axle case 17 so as to be slidable in the left-right direction.
  • a differential lock shifter 166 is slidable in the left-right direction on the side surface of the frame body 162 that faces the side surface on which the ring gear 161 is disposed.
  • a differential lock shifter 166 is slidably fitted on the rear axle 175 axis via a frame 162 so as to be slidably supported.
  • the front end side of the diff lock pin 165 is configured to be able to freely enter and exit in the frame 162, and a diff lock notch 163a is formed on the outer peripheral portion of the side gear 163 facing the diff lock pin 65, and the front end side of the diff lock pin 165 is inserted into the diff lock notch 163a.
  • the differential lock pin 165 is engaged with and disengaged from the side gear 163, and the differential transmission operation of the differential gear mechanism 160 is removably locked by the differential lock pin 165.
  • a differential lock cam 171 as means for engaging the differential lock pin 165 with the differential lock notch 163a and a lock release spring 172 for releasing the differential lock pin 165 from the differential lock notch 163a are provided.
  • a differential lock cam 171 is formed on one end side of the fork boss portion 167 a of the differential lock fork 167, and a differential lock spring 171 is wound on the outer peripheral side of the other end side of the fork boss portion 167 a among the outer peripheral side of the differential lock shaft 168.
  • the cam floor pin 173 is fixed to the differential lock shaft 168, the cam floor pin 173 is pressed against the differential lock cam 171 by the force of the unlocking spring 172, and the differential lock pedal 66 is provided at the end of the differential lock shaft 168 projecting outward from the transmission case 16. The proximal side is connected.
  • the differential lock fork 167 slides to the left side away from the frame body 162 (the differential lock notch 163a of the side gear 163) due to the elastic force of the lock release spring 172.
  • the differential lock pin 165 is held out of the differential lock notch 163a of the side gear 163, and the differential gear mechanism 160 is operated to differentially drive the left and right rear wheels 4.
  • the diff lock pedal 66 is stepped on by the operator, the diff lock shaft 168 rotates about this axis, the cam floor pin 173 moves in the diff lock cam 171, and resists the lock release spring 172 to the frame body 162.
  • the differential lock fork 167 is moved to the right side close to (the differential lock notch 163a of the side gear 163).
  • the diff lock pedal 66 as a step pedal is formed by a pedal base end portion 141 connected to the diff lock pin 165 side and a pedal operation portion 142 that is operated by the operator.
  • the attachment boss portion 141a of the pedal base end portion 141 is fixed to the differential lock shaft 168 on which the differential lock pin 165 is disposed, and the base end side of the pedal operation portion 142 is folded to the pedal base end portion 141 via the bending fulcrum shaft 143. It is connected so that it can be bent.
  • a bearing cylinder 144 is fixed to the distal end side of the pedal base end portion 141, and the bending fulcrum shaft 143 is pivotally supported.
  • the front end side of the pedal operation unit 142 protrudes from the pedal guide hole 174 at the rear of the boarding step 10 toward the upper surface side of the boarding step 10.
  • a bifurcated base bracket 145 is provided on the base end side of the pedal operation portion 142, and a mounting plate 146 to which a bending fulcrum shaft 143 is fixed is detachably attached to the base bracket 145 with a bolt 147.
  • the pedal base end portion 141 and the pedal operation portion 142 are connected by a bending fulcrum shaft 143 so as to be bent.
  • two return spring bodies 148 are provided as return means for pressing the pedal operating portion 142 against the pedal base end portion 141 in an unbent state.
  • the both ends of the two return spring bodies 148 are respectively connected to the locking pin 150 of the spring support bracket 149 fixed to the distal end side of the pedal base end portion 141 and the spring receiving pin 151 fixed to the pedal operation portion 142.
  • a stopper plate body 152 is fixed to the base bracket 145, and the stopper plate body 152 is configured to be abutted and supported by the pedal base end portion 141 by the elastic force of the return spring body 148.
  • the stopper plate body 152 abuts on the pedal base end portion 141 by the elastic force of the return spring body 148, and the pedal operation portion 142 is connected to the pedal base end portion 141 in an unfolded state.
  • the pedal operation part 142 is configured to bend with respect to the pedal base end part 141 against the return spring body 148, and with respect to the pedal base end part 141 by the stepping operation of the pedal operation part 142.
  • the pedal operation unit 142 is bent and the differential lock pin 165 is supported at the non-engagement position, the return spring body 148 force that connects the pedal base end 141 and the pedal operation unit 142 to the non-bent state.
  • the differential lock pin 165 is configured to be maintained in the engagement operation state.
  • the differential lock pin 165 is engaged with the differential gear mechanism 160 to forcibly fix the left and right rear wheels 4 in the differential lock state (same rotational speed).
  • the differential lock pin 65 can be smoothly engaged with the differential lock notch 63a, and the left and right rear wheels 4 can be shifted to the differential lock drive state at an early stage.
  • a traveling machine body 2 on which a diesel engine 5 is mounted a transmission case 16 for transmitting the power of the diesel engine 5 to the rear wheels 4 as left and right traveling units, and a transmission case 16 Diff lock as a foot pedal for engaging and disengaging the differential lock pin 165 in a traveling vehicle including a differential gear mechanism 160 installed in the vehicle and a differential lock pin 165 for releasably locking the differential transmission operation of the differential gear mechanism 160
  • the differential lock pedal 66 is formed by a pedal base end portion 141 connected to the differential lock pin 165 side and a pedal operation portion 142 that is stepped on by an operator, and the pedal base end portion 141 is operated by a pedal.
  • the part 142 is connected so that it can be bent. Therefore, the differential lock pin 165 can be easily supported in the disengaged state when the pedal operation unit 142 is stepped on.
  • the pedal operation unit 142 is supported at the stepping position even when the differential lock pin 165 is not in the engagement position.
  • the differential lock pin 165 is engaged, it is not necessary for the operator to maintain a high stepping position, and the stepping operability of the differential lock pedal 66 can be improved.
  • the stepping operation state of the pedal operation unit 142 can be easily continued, the problem that the differential lock pedal 66 is inappropriately operated can be reduced, and the differential gear mechanism 160 can be properly engaged with the differential lock pin 165.
  • a return spring body 148 is provided as a return means for pressing the pedal operating portion 142 in a non-bent state against the pedal base end portion 141. Therefore, the differential lock pin 165 can be smoothly shifted from the non-engaged state to the engaged state under the state where the pedal operation unit 142 is stepped on.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)

Abstract

The purpose of the present invention is to provide a travel vehicle configured so that the foot-pressing operability of a foot pedal (66) is improved and so that a differential lock pin (165) properly engages with a differential gear mechanism (160). Provided is a travel vehicle that comprises a travel body (2) on which an engine (5) is mounted, a transmission case (16) that transmits the power of the engine (5) to left and right travel sections (4), a differential gear mechanism (160) that is provided inside the transmission case (16), and a differential lock pin (165) that releaseably locks the differential transmission operation of the differential gear mechanism (160), wherein the travel vehicle is a structure provided with a foot pedal (66) by which the differential lock pin (165) is releaseably operated, the foot pedal (66) is constituted by a pedal base end part (141) that is connected to the differential lock pin (165) side and a pedal operation part (142) which is operated by an operator performing a foot-pressing operation, and the pedal operation part (142) is bendably connected to the pedal base end part (141).

Description

走行車両Traveling vehicle
　本発明は、ロータリ耕耘機等の対地作業機を牽引するためのトラクタ等の走行車両に係り、より詳しくは、左右の後車輪を駆動する差動ギヤ機構と、差動ギヤ機構をロックするデフロックペダルを備える走行車両に関するものである。 The present invention relates to a traveling vehicle such as a tractor for towing a ground working machine such as a rotary tiller, and more particularly, a differential gear mechanism that drives left and right rear wheels, and a differential lock that locks the differential gear mechanism. The present invention relates to a traveling vehicle including a pedal.
　従来、トラクタ等の走行車両が、農道などの路上を走行する状態において、デフロックペダルを足踏み操作して、差動ギヤ機構のデフロックピンを係合操作し、左右の後車輪の差動駆動を中止し、走行車両の蛇行走行を低減させる技術がある（例えば、特許文献１)。 Conventionally, when a traveling vehicle such as a tractor travels on a road such as a farm road, the diff lock pedal is stepped on, the differential lock pin of the differential gear mechanism is engaged, and the differential drive of the left and right rear wheels is stopped. However, there is a technique for reducing the meandering traveling of the traveling vehicle (for example, Patent Document 1).
特開昭２０１２－６３８２３号公報JP 2012-63823 A
　前記従来技術では、デフロックペダルの足踏み操作にて、差動ギヤ機構にデフロックピンを係合させるとき、デフロックピンが係合位置にないとき、デフロックペダルが足踏み初期位置に支持される。即ち、デフロックペダルを足踏み操作しても、デフロックピンが係合するまでの間、オペレータが高い足踏み位置を維持する必要があり、デフロックペダルの足踏み操作性を向上できない等の問題がある。なお、オペレータがデフロックピンの係合を目視確認できないから、オペレータがデフロックペダルを足踏み操作しても、デフロックピンが係合する前に、デフロックペダルからオペレータが足を離し、デフロックペダル操作が不適正に行われる場合もある。 In the prior art, when the differential lock mechanism is engaged with the differential gear mechanism by the stepping operation of the differential lock pedal, the differential lock pedal is supported at the initial step position when the differential lock pin is not in the engaged position. That is, even if the diff lock pedal is stepped on, there is a problem that the operator needs to maintain a high stepping position until the diff lock pin is engaged, and the step operability of the diff lock pedal cannot be improved. In addition, since the operator cannot visually confirm the engagement of the diff lock pin, even if the operator steps on the diff lock pedal, the operator releases the foot from the diff lock pedal before the diff lock pin is engaged, and the diff lock pedal operation is inappropriate. Sometimes it is done.
　そこで、本願発明は、これらの現状を検討して改善を施した走行車両を提供しようとするものである。 Therefore, the present invention seeks to provide a traveling vehicle that has been improved by examining these current conditions.
　前記目的を達成するため、請求項１に係る発明の走行車両は、エンジンが搭載された走行機体と、左右の走行部に前記エンジンの動力を伝達するミッションケースと、前記ミッションケースに内設する差動ギヤ機構と、前記差動ギヤ機構の差動伝達動作を係脱可能にロックするデフロックピンを備える走行車両において、前記デフロックピンを係脱操作する足踏みペダルを設ける構造であって、前記足踏みペダルは、前記デフロックピン側に連結するペダル基端部と、オペレータが足踏み操作するペダル操作部にて形成し、前記ペダル基端部に前記ペダル操作部を折曲可能に連結したものである。 In order to achieve the above object, a traveling vehicle according to a first aspect of the present invention includes a traveling machine body on which an engine is mounted, a transmission case that transmits power of the engine to left and right traveling units, and a transmission case. In a traveling vehicle comprising a differential gear mechanism and a differential lock pin that releasably locks the differential transmission operation of the differential gear mechanism, a step pedal for engaging and disengaging the differential lock pin is provided, the step pedal The pedal is formed by a pedal base end portion connected to the differential lock pin side and a pedal operation portion that an operator steps on, and the pedal operation portion is connected to the pedal base end portion in a foldable manner.
　請求項２に記載の発明は、請求項１に記載の走行車両において、前記ペダル基端部に対して前記ペダル操作部を非折曲状態に弾圧させる復動手段を設けたものである。 According to a second aspect of the present invention, in the traveling vehicle according to the first aspect of the present invention, there is provided a backward moving means for repressing the pedal operation portion in an unfolded state with respect to the pedal base end portion.
　請求項３に記載の発明は、請求項１に記載の走行車両において、前記ペダル操作部の足踏み操作にて、前記ペダル基端部に対して前記ペダル操作部が折曲して、前記デフロックピンが非係合位置に支持された状態において、前記ペダル基端部と前記ペダル操作部を非折曲状態に連結する復動バネ力によって、前記デフロックピンが係合操作状態に維持されるように構成したものである。 According to a third aspect of the present invention, in the traveling vehicle according to the first aspect, the pedal operation portion is bent with respect to the pedal base end portion by the stepping operation of the pedal operation portion, and the differential lock pin The differential lock pin is maintained in the engaged operation state by the return spring force that connects the pedal base end portion and the pedal operation portion to the non-bent state when the pedal is supported at the non-engagement position. It is composed.
　請求項１に係る発明によれば、エンジンが搭載された走行機体と、左右の走行部に前記エンジンの動力を伝達するミッションケースと、前記ミッションケースに内設する差動ギヤ機構と、前記差動ギヤ機構の差動伝達動作を係脱可能にロックするデフロックピンを備える走行車両において、前記デフロックピンを係脱操作する足踏みペダルを設ける構造であって、前記足踏みペダルは、前記デフロックピン側に連結するペダル基端部と、オペレータが足踏み操作するペダル操作部にて形成し、前記ペダル基端部に前記ペダル操作部を折曲可能に連結したものであるから、前記ペダル操作部を足踏み操作したときに、前記デフロックピンを非係合状態に簡単に支持できる。前記足踏みペダルの足踏み操作にて、前記差動ギヤ機構に前記デフロックピンを係合させるとき、前記デフロックピンが係合位置にないときにも、前記ペダル操作部が足踏み位置に支持されるから、前記デフロックピンが係合するまでの間、オペレータが高い足踏み位置を維持する必要がなく、前記足踏みペダルの足踏み操作性を向上できる。また、前記ペダル操作部の足踏み操作状態を容易に継続できるから、前記足踏みペダル操作が不適正に行われる不具合を低減でき、前記差動ギヤ機構に前記デフロックピンを適正に係合できる。 According to the first aspect of the present invention, a traveling machine body on which an engine is mounted, a transmission case that transmits power of the engine to left and right traveling units, a differential gear mechanism that is installed in the transmission case, and the difference In a traveling vehicle having a differential lock pin for releasably locking the differential transmission operation of the dynamic gear mechanism, a step pedal for engaging and disengaging the differential lock pin is provided, and the foot pedal is disposed on the differential lock pin side. A pedal base end portion to be connected and a pedal operation portion that an operator steps on, and the pedal operation portion is foldably connected to the pedal base end portion. When this is done, the differential lock pin can be easily supported in a disengaged state. When the differential gear mechanism is engaged with the differential lock mechanism in the stepping operation of the foot pedal, the pedal operation portion is supported at the foot position even when the differential lock pin is not in the engagement position. Until the differential lock pin is engaged, the operator does not need to maintain a high stepping position, and the stepping operability of the stepping pedal can be improved. In addition, since the stepping operation state of the pedal operation unit can be easily continued, the problem that the stepping pedal operation is improperly performed can be reduced, and the differential lock mechanism can be properly engaged with the differential gear mechanism.
　請求項２に係る発明によれば、前記ペダル基端部に対して前記ペダル操作部を非折曲状態に弾圧させる復動手段を設けたものであるから、前記ペダル操作部を足踏み操作した状態下で、前記デフロックピンを非係合状態から係合状態にスムーズに移行させることができる。 According to the invention according to claim 2, since the return operation means is provided to repress the pedal operation portion in a non-bending state with respect to the pedal base end portion, the pedal operation portion is operated by stepping. The differential lock pin can be smoothly shifted from the disengaged state to the engaged state.
　請求項３に係る発明によれば、前記ペダル操作部の足踏み操作にて、前記ペダル基端部に対して前記ペダル操作部が折曲して、前記デフロックピンが非係合位置に支持された状態において、前記ペダル基端部と前記ペダル操作部を非折曲状態に連結する復動バネ力によって、前記デフロックピンが係合操作状態に維持されるように構成したものであるから、前記ペダル操作部を足踏み操作した状態下で、前記ペダル基端部に対する前記ペダル操作部の姿勢を折曲状態から非折曲状態にスムーズに復帰させることができる。 According to the invention of claim 3, the pedal operation portion is bent with respect to the pedal base end portion by the stepping operation of the pedal operation portion, and the differential lock pin is supported at the non-engagement position. In the state, the differential lock pin is maintained in the engagement operation state by the return spring force that connects the pedal base end portion and the pedal operation portion to the non-bending state. Under the state where the operation portion is stepped on, the posture of the pedal operation portion with respect to the pedal base end portion can be smoothly returned from the bent state to the non-bent state.
第１実施形態を示すトラクタの側面図である。It is a side view of the tractor which shows 1st Embodiment. 同平面図である。It is the same top view. ミッションケース部の右側面図である。It is a right view of a mission case part. ミッションケース部の平面図である。It is a top view of a mission case part. デフロック用の足踏みペダル部の平面図である。It is a top view of the foot pedal part for differential locks. 同足踏みペダル部の斜視図である。It is a perspective view of the foot pedal part. 図６の拡大説明図である。FIG. 7 is an enlarged explanatory view of FIG. 6. 足踏みペダル部の右側面図である。It is a right view of a foot pedal part. 図８の作動説明図である。FIG. 9 is an operation explanatory diagram of FIG. 8. 足踏みペダルの分解説明図である。It is decomposition | disassembly explanatory drawing of a foot pedal. ミッションケースの差動ギヤ機構部の断面図である。It is sectional drawing of the differential gear mechanism part of a transmission case.
　以下、本発明の実施形態を図面に基づいて説明する。図１は農作業用トラクタ及びロータリ耕耘機の側面図、図２は同平面図である。なお、以下の説明では、走行機体１の前進方向に向かって左側を単に左側と称し、同じく前進方向に向かって右側を単に右側と称する。図１、図２に示す如く、前記トラクタ１における走行機体２は左右一対の前車輪３と左右一対の後車輪４とで支持されている。走行機体２の前部に搭載したディーゼルエンジン５にて後車輪４及び前車輪３を駆動して、トラクタ１は前進走行または後進走行する。ディーゼルエンジン５の上方側は、開閉可能なボンネット６にて覆われる。また、走行機体２の上面のうちボンネット６の後方には運転部７が設置される。オペレータが座乗する操縦座席８と、前車輪３を操向操作する操縦ハンドル９とが運転部７に設置されている。また、運転部７には、オペレータが搭乗する搭乗ステップ１０が設けられている。オペレータが乗降する乗降ステップ１１を、搭乗ステップ１０の左側に設けている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a farm tractor and a rotary tiller, and FIG. 2 is a plan view thereof. In the following description, the left side in the forward direction of the traveling machine body 1 is simply referred to as the left side, and the right side in the forward direction is also simply referred to as the right side. As shown in FIGS. 1 and 2, the traveling machine body 2 in the tractor 1 is supported by a pair of left and right front wheels 3 and a pair of left and right rear wheels 4. The rear wheels 4 and the front wheels 3 are driven by a diesel engine 5 mounted on the front part of the traveling machine body 2 so that the tractor 1 travels forward or backward. The upper side of the diesel engine 5 is covered with an openable / closable bonnet 6. A driving unit 7 is installed behind the hood 6 on the upper surface of the traveling machine body 2. A control seat 8 on which an operator sits and a control handle 9 for steering the front wheel 3 are installed in the driving unit 7. In addition, the driving unit 7 is provided with a boarding step 10 on which an operator boards. A boarding / alighting step 11 on which the operator gets on / off is provided on the left side of the boarding step 10.
　また、図１、図４に示す如く、前記走行機体２は、前バンパ１２及び前車軸ケース１３を有するエンジンフレーム１４と、ディーゼルエンジン５の後部に固定するクラッチハウジング１５と、ミッションケース１６により構成される。ディーゼルエンジン５の回転をミッションケース１６にて変速して、後車輪４または前車輪３に伝達する。加えて、ミッションケース１６の左右側面から外向きに後車軸ケース１７を突出させ、後車軸ケース１７に後車輪４を取付ける。後車軸ケース１７にロプスフレーム１８を立設させると共に、ミッションケース１６前部上面の操縦座席８とロプスフレーム１８の間に燃料タンク１９を搭載する。 As shown in FIGS. 1 and 4, the traveling machine body 2 includes an engine frame 14 having a front bumper 12 and a front axle case 13, a clutch housing 15 fixed to the rear portion of the diesel engine 5, and a transmission case 16. Is done. The rotation of the diesel engine 5 is changed by the transmission case 16 and transmitted to the rear wheel 4 or the front wheel 3. In addition, the rear axle case 17 is projected outward from the left and right side surfaces of the transmission case 16, and the rear wheel 4 is attached to the rear axle case 17. The rear axle case 17 is provided with a rops frame 18 standing, and a fuel tank 19 is mounted between the control seat 8 on the front upper surface of the transmission case 16 and the rops frame 18.
　さらに、図１～図４に示す如く、ミッションケース１６の後部上面には、対地作業機としてのロータリ耕耘機２４を昇降動するための油圧昇降機構２０が搭載される。ミッションケース１６の後部に、一対の左右ロワーリンク２１及びトップリンク２２からなる３点リンク機構２３を設け、３点リンク機構２３を介してミッションケース１６にロータリ耕耘機２４を昇降可能に装着させる。左右ロワーリンク２１の前端側は、ミッションケース１６の後部の左右側面にロワーリンクピン２５を介して回動可能に連結している。トップリンク２２の前端側は、油圧昇降機構２０の後部のトップリンクヒッチ２６にトップリンクピン２７を介して連結している。さらに、ロータリ耕耘機２４にＰＴＯ駆動力を伝達するＰＴＯ軸２８を備え、ミッションケース１６の後側面から後向きに突出するようにＰＴＯ軸２８を設けている。 Further, as shown in FIGS. 1 to 4, a hydraulic lifting mechanism 20 for lifting and lowering a rotary tiller 24 as a ground working machine is mounted on the upper surface of the rear portion of the mission case 16. A three-point link mechanism 23 including a pair of left and right lower links 21 and a top link 22 is provided at the rear part of the mission case 16, and the rotary tiller 24 is mounted on the mission case 16 via the three-point link mechanism 23 so as to be movable up and down. The front end sides of the left and right lower links 21 are rotatably connected to the left and right side surfaces of the rear portion of the mission case 16 via lower link pins 25. The front end side of the top link 22 is connected to a top link hitch 26 at the rear of the hydraulic lifting mechanism 20 via a top link pin 27. Further, a PTO shaft 28 that transmits the PTO driving force to the rotary tiller 24 is provided, and the PTO shaft 28 is provided so as to protrude rearward from the rear side surface of the transmission case 16.
　加えて、油圧昇降機構２０には、１対の左右リフトアーム２９が設置されている。進行方向に向かって左側のロワーリンク２１とリフトアーム２９とが、左リフトロッド３０を介して連結されている。進行方向に向かって右側のロワーリンク２１とリフトアーム２９とは、右リフトロッドを形成する複動形の油圧ローリングシリンダ３２及びピストンロッド３３を介して連結されている。 In addition, the hydraulic lifting mechanism 20 is provided with a pair of left and right lift arms 29. The lower link 21 and the lift arm 29 on the left side in the traveling direction are connected via a left lift rod 30. The lower link 21 and the lift arm 29 on the right side in the traveling direction are connected via a double-acting hydraulic rolling cylinder 32 and a piston rod 33 that form a right lift rod.
　図１、図２に示す如く、ロータリ耕耘機２４は、横長筒状のメインビーム３６と、メインビーム３６の左右側端部にそれぞれ上端側が連結されたチェンケース３７及び軸受板３８と、チェンケース３７及び軸受板３８の下端側に左右両端部が回転自在に軸支された耕耘爪軸３９と、耕耘爪軸３９に放射状にて着脱可能に取付く複数の耕耘爪４０と、耕耘爪４０の回転軌跡の上方を覆うように配置された耕耘上面カバー４１と、耕耘爪４０の回転軌跡の左右側方を覆うように配置された左右耕耘サイドカバー４２と、耕耘爪４０の回転軌跡の後方を覆うように配置された耕耘リヤカバー４３と、メインビーム３６に前端側が取付けられて後方に長く伸びる耕深調節フレーム４４等を有する。なお、耕深調節ハンドル４５の手動操作にて、ロータリ耕耘機２４の対地姿勢を、前傾姿勢または後傾姿勢に変化させて、耕耘爪４０による耕耘深さを変更可能に構成している。ＰＴＯ軸２３からの動力が耕耘爪軸３９に伝えられ、耕耘爪４０を図１において反時計方向に回転させて、圃場の耕土を耕起する。 As shown in FIGS. 1 and 2, the rotary cultivator 24 includes a horizontally long main beam 36, a chain case 37 and a bearing plate 38 each having an upper end connected to left and right ends of the main beam 36, and a chain case 37 and a bearing plate 38. A tilling claw shaft 39 whose left and right end portions are rotatably supported on the lower end side thereof, a plurality of tilling claws 40 attached to the tilling claw shaft 39 in a detachable manner radially, A tilling top cover 41 arranged so as to cover the upper side of the rotation trajectory, a left and right tilling side cover 42 arranged so as to cover the left and right sides of the rotation trajectory of the tilling claw 40, and a rear side of the rotation trajectory of the tilling claw 40. A tilling rear cover 43 disposed so as to cover, a tilling depth adjusting frame 44 that is attached to the main beam 36 at the front end side and extends rearward and the like. In addition, by manually operating the tilling depth adjusting handle 45, the ground posture of the rotary tiller 24 is changed to the forward tilting posture or the backward tilting posture, so that the tilling depth by the tilling claws 40 can be changed. The power from the PTO shaft 23 is transmitted to the tilling claw shaft 39, and the tilling claw 40 is rotated counterclockwise in FIG. 1 to plow the cultivated soil in the field.
　また、図１及び図２に示す如く、操縦ハンドル９が配置される操縦コラム６０を備え、操縦コラム６０の右側下方に左右ブレーキペダル６１が配置される。また、操縦コラム６０の左側下方に走行クラッチペダル６２が配置される。操縦座席８の右側方には、作業機昇降レバー６３と、走行主変速レバー６４が配置される。操縦座席８の左方には、走行副変速レバー６５が配置される。操縦座席８の右側前方には、左右後車輪４の差動駆動をロックするデフロックペダル６６が配置される。操縦座席８の後方側で、油圧昇降機構２０の上面側には、走行機体２の左右傾動を検出する振り子構造のローリングセンサ６７が配置される。 Further, as shown in FIGS. 1 and 2, a steering column 60 on which the steering handle 9 is disposed is provided, and a left and right brake pedal 61 is disposed on the lower right side of the steering column 60. A traveling clutch pedal 62 is disposed below the left side of the steering column 60. On the right side of the control seat 8, a work machine elevating lever 63 and a travel main transmission lever 64 are arranged. A travel auxiliary transmission lever 65 is arranged on the left side of the control seat 8. A differential lock pedal 66 that locks the differential drive of the left and right rear wheels 4 is disposed in front of the right side of the control seat 8. On the rear side of the control seat 8 and on the upper surface side of the hydraulic lifting mechanism 20, a rolling sensor 67 having a pendulum structure that detects the left-right tilt of the traveling machine body 2 is disposed.
　一方、図１１に示す如く、差動ギヤ機構１６０は、ディーゼルエンジン５の駆動力を伝達させるリングギヤ１６１と、リングギヤ１６１に固着する枠体１６２と、枠体１６２内に設ける左右サイドギヤ１６３と、左右サイドギヤ１６３を連結するピニオンギヤ１６４を有する。左右後車輪４駆動用の左右後車軸１７５に左右サイドギヤ１６３を係合軸支する。リングギヤ１６１に伝達される走行変速出力によって、差動ギヤ機構１６０を介して左右の後車軸１７５が差動回転し、左右の後車輪４が差動駆動される。 On the other hand, as shown in FIG. 11, the differential gear mechanism 160 includes a ring gear 161 for transmitting the driving force of the diesel engine 5, a frame body 162 fixed to the ring gear 161, left and right side gears 163 provided in the frame body 162, A pinion gear 164 for connecting the side gear 163 is provided. The left and right side gears 163 are pivotally supported on the left and right rear axles 175 for driving the left and right rear wheels 4. By the traveling shift output transmitted to the ring gear 161, the left and right rear axles 175 are differentially rotated through the differential gear mechanism 160, and the left and right rear wheels 4 are differentially driven.
　また、差動ギヤ機構１６０は、枠体１６２にサイドギヤ１６３を係止するデフロックピン１６５と、デフロックピン１６５を設けるデフロックシフタ１６６と、後車軸１７５上のデフロックシフタ１６６をスライドさせるロックピン係脱操作機構としてのデフロックフォーク１６７と、デフロックフォーク１６７のフォークボス部１６７ａをスライド可能に軸支させるデフロック軸１６８を有する。後車軸ケース１７の左右の軸受部１７ｂ（ミッションケース１６内部）にデフロック軸１６８の左右両端部を左右方向にスライド可能に支持している。枠体１６２の側面のうち、リングギヤ１６１が配置された側面と対向する側面に、デフロックシフタ１６６を左右方向にスライド可能に設ける。後車軸１７５軸心線上に枠体１６２を介してデフロックシフタ１６６をスライド可能に遊嵌軸支する。枠体１６２内にデフロックピン１６５の先端側を出入自在に構成すると共に、デフロックピン６５に対向するサイドギヤ１６３の外周部にデフロックノッチ１６３ａを形成し、デフロックノッチ１６３ａにデフロックピン１６５の先端側を出入可能に形成し、サイドギヤ１６３にデフロックピン１６５を係脱させて、デフロックピン１６５にて差動ギヤ機構１６０の差動伝達動作を係脱可能にロックするように構成している。 The differential gear mechanism 160 also includes a differential lock pin 165 that locks the side gear 163 to the frame 162, a differential lock shifter 166 that provides the differential lock pin 165, and a lock pin engagement / disengagement operation that slides the differential lock shifter 166 on the rear axle 175. A differential lock fork 167 as a mechanism, and a differential lock shaft 168 for slidably supporting a fork boss portion 167a of the differential lock fork 167 are provided. The left and right end portions of the differential lock shaft 168 are supported by the left and right bearing portions 17b (inside the transmission case 16) of the rear axle case 17 so as to be slidable in the left-right direction. A differential lock shifter 166 is slidable in the left-right direction on the side surface of the frame body 162 that faces the side surface on which the ring gear 161 is disposed. A differential lock shifter 166 is slidably fitted on the rear axle 175 axis via a frame 162 so as to be slidably supported. The front end side of the diff lock pin 165 is configured to be able to freely enter and exit in the frame 162, and a diff lock notch 163a is formed on the outer peripheral portion of the side gear 163 facing the diff lock pin 65, and the front end side of the diff lock pin 165 is inserted into the diff lock notch 163a. The differential lock pin 165 is engaged with and disengaged from the side gear 163, and the differential transmission operation of the differential gear mechanism 160 is removably locked by the differential lock pin 165.
　さらに、デフロックノッチ１６３ａにデフロックピン１６５を係合させる手段としてのデフロックカム１７１と、デフロックノッチ１６３ａからデフロックピン１６５を離脱させるロック解除バネ１７２を備える。デフロックフォーク１６７のフォークボス部１６７ａ一端側にデフロックカム１７１を形成すると共に、デフロック軸１６８の外周側のうちフォークボス部１６７ａ他端側の外周側にデフロックバネ１７１を巻装する。また、デフロック軸１６８にカムフロアピン１７３を固着し、デフロックカム１７１にカムフロアピン１７３をロック解除バネ１７２力にて弾圧させると共に、ミッションケース１６から外側方に突設させたデフロック軸１６８端部にデフロックペダル６６基端側を連結している。 Furthermore, a differential lock cam 171 as means for engaging the differential lock pin 165 with the differential lock notch 163a and a lock release spring 172 for releasing the differential lock pin 165 from the differential lock notch 163a are provided. A differential lock cam 171 is formed on one end side of the fork boss portion 167 a of the differential lock fork 167, and a differential lock spring 171 is wound on the outer peripheral side of the other end side of the fork boss portion 167 a among the outer peripheral side of the differential lock shaft 168. Further, the cam floor pin 173 is fixed to the differential lock shaft 168, the cam floor pin 173 is pressed against the differential lock cam 171 by the force of the unlocking spring 172, and the differential lock pedal 66 is provided at the end of the differential lock shaft 168 projecting outward from the transmission case 16. The proximal side is connected.
　上記の構成により、デフロックペダル６６が足踏み操作されていないとき、ロック解除バネ１７２の弾圧力によって、枠体１６２（サイドギヤ１６３のデフロックノッチ１６３ａ）から離れる左側方にデフロックフォーク１６７が摺動して、サイドギヤ１６３のデフロックノッチ１６３ａからデフロックピン１６５が脱出した状態に保持され、差動ギヤ機構１６０が働いて左右の後車輪４が差動駆動される。一方、オペレータによってデフロックペダル６６が足踏み操作されたとき、デフロック軸１６８がこの軸心線回りに回動し、カムフロアピン１７３がデフロックカム１７１内を移動し、ロック解除バネ１７２に抗して枠体１６２（サイドギヤ１６３のデフロックノッチ１６３ａ）に近接する右側方にデフロックフォーク１６７を移動させる。 With the above configuration, when the differential lock pedal 66 is not stepped on, the differential lock fork 167 slides to the left side away from the frame body 162 (the differential lock notch 163a of the side gear 163) due to the elastic force of the lock release spring 172. The differential lock pin 165 is held out of the differential lock notch 163a of the side gear 163, and the differential gear mechanism 160 is operated to differentially drive the left and right rear wheels 4. On the other hand, when the diff lock pedal 66 is stepped on by the operator, the diff lock shaft 168 rotates about this axis, the cam floor pin 173 moves in the diff lock cam 171, and resists the lock release spring 172 to the frame body 162. The differential lock fork 167 is moved to the right side close to (the differential lock notch 163a of the side gear 163).
　デフロックペダル６６を足踏み操作したとき、サイドギヤ１６３のデフロックノッチ１６３ａにデフロックピン１６５が対向していた場合、デフロックノッチ１６３ａにデフロックピン６５の先端部が係合する。一方、デフロックペダル６６を足踏み操作したとき、サイドギヤ１６３のデフロックノッチ１６３ａにデフロックピン１６５が対向していない場合、サイドギヤ１６３の側面にデフロックピン１６５の先端面が当接し、その状態下でサイドギヤ１６３が回転駆動することによって、デフロックノッチ１６３ａにデフロックピン１６５が対向して、デフロックノッチ１６３ａにデフロックピン１６５の先端部が係合する。 When the differential lock pedal 66 is stepped on and the differential lock pin 165 faces the differential lock notch 163a of the side gear 163, the tip of the differential lock pin 65 is engaged with the differential lock notch 163a. On the other hand, when the differential lock pedal 66 is stepped on, if the differential lock pin 165 does not face the differential lock notch 163a of the side gear 163, the tip surface of the differential lock pin 165 contacts the side surface of the side gear 163, and the side gear 163 is in that state. By rotationally driving, the differential lock pin 165 faces the differential lock notch 163a, and the tip of the differential lock pin 165 engages with the differential lock notch 163a.
　次に、図５～図１０を参照して、デフロックピンを係脱操作する足踏みペダルの構造を説明する。図７～図１０に示す如く、足踏みペダルとしてのデフロックペダル６６は、デフロックピン１６５側に連結するペダル基端部１４１と、オペレータが足踏み操作するペダル操作部１４２にて形成する。デフロックピン１６５が配置されたデフロック軸１６８にペダル基端部１４１の取付けボス部１４１ａを固着すると共に、折曲げ支点軸１４３を介してペダル基端部１４１にペダル操作部１４２の基端側を折曲可能に連結させている。ペダル基端部１４１の先端側に軸受筒体１４４を固着し、折曲げ支点軸１４３を回動可能に軸支する。搭乗ステップ１０後部のペダルガイド孔１７４からペダル操作部１４２の先端側を搭乗ステップ１０上面側に向けて突出さている。 Next, the structure of a foot pedal for engaging and disengaging the differential lock pin will be described with reference to FIGS. As shown in FIGS. 7 to 10, the diff lock pedal 66 as a step pedal is formed by a pedal base end portion 141 connected to the diff lock pin 165 side and a pedal operation portion 142 that is operated by the operator. The attachment boss portion 141a of the pedal base end portion 141 is fixed to the differential lock shaft 168 on which the differential lock pin 165 is disposed, and the base end side of the pedal operation portion 142 is folded to the pedal base end portion 141 via the bending fulcrum shaft 143. It is connected so that it can be bent. A bearing cylinder 144 is fixed to the distal end side of the pedal base end portion 141, and the bending fulcrum shaft 143 is pivotally supported. The front end side of the pedal operation unit 142 protrudes from the pedal guide hole 174 at the rear of the boarding step 10 toward the upper surface side of the boarding step 10.
　また、図１０に示す如く、ペダル操作部１４２の基端側に二股状の基部ブラケット１４５を設け、折曲げ支点軸１４３が固着された取付け板体１４６を基部ブラケット１４５に着脱可能にボルト１４７締結し、ペダル基端部１４１とペダル操作部１４２を折曲げ支点軸１４３にて折曲可能に連結させている。図８～図１０に示す如く、ペダル基端部１４１に対してペダル操作部１４２を非折曲状態に弾圧させる復動手段としての２本の復動バネ体１４８を設けている。ペダル基端部１４１先端側に固設したバネ支持ブラケット１４９の係止ピン１５０と、ペダル操作部１４２に固設したバネ受けピン１５１とに、２本の復動バネ体１４８の両端側をそれぞれ係止させる。基部ブラケット１４５にストッパ板体１５２を固設し、復動バネ体１４８の弾圧力にてペダル基端部１４１にストッパ板体１５２を当接支持されるように構成している。 Further, as shown in FIG. 10, a bifurcated base bracket 145 is provided on the base end side of the pedal operation portion 142, and a mounting plate 146 to which a bending fulcrum shaft 143 is fixed is detachably attached to the base bracket 145 with a bolt 147. In addition, the pedal base end portion 141 and the pedal operation portion 142 are connected by a bending fulcrum shaft 143 so as to be bent. As shown in FIGS. 8 to 10, two return spring bodies 148 are provided as return means for pressing the pedal operating portion 142 against the pedal base end portion 141 in an unbent state. The both ends of the two return spring bodies 148 are respectively connected to the locking pin 150 of the spring support bracket 149 fixed to the distal end side of the pedal base end portion 141 and the spring receiving pin 151 fixed to the pedal operation portion 142. Lock. A stopper plate body 152 is fixed to the base bracket 145, and the stopper plate body 152 is configured to be abutted and supported by the pedal base end portion 141 by the elastic force of the return spring body 148.
　即ち、復動バネ体１４８の弾圧力にてペダル基端部１４１にストッパ板体１５２が当接して、ペダル基端部１４１に対してペダル操作部１４２が非折曲状態に連結される一方、復動バネ体１４８に抗し、ペダル基端部１４１に対してペダル操作部１４２が折曲するように構成するものであり、ペダル操作部１４２の足踏み操作にて、ペダル基端部１４１に対してペダル操作部１４２が折曲して、デフロックピン１６５が非係合位置に支持された状態において、ペダル基端部１４１とペダル操作部１４２を非折曲状態に連結する復動バネ体１４８力によって、デフロックピン１６５が係合操作状態に維持されるように構成している。 That is, the stopper plate body 152 abuts on the pedal base end portion 141 by the elastic force of the return spring body 148, and the pedal operation portion 142 is connected to the pedal base end portion 141 in an unfolded state. The pedal operation part 142 is configured to bend with respect to the pedal base end part 141 against the return spring body 148, and with respect to the pedal base end part 141 by the stepping operation of the pedal operation part 142. When the pedal operation unit 142 is bent and the differential lock pin 165 is supported at the non-engagement position, the return spring body 148 force that connects the pedal base end 141 and the pedal operation unit 142 to the non-bent state. Thus, the differential lock pin 165 is configured to be maintained in the engagement operation state.
　上記の構成により、搭乗ステップ１０後部のペダルガイド孔１７４から突出したペダル操作部１４２の先端側をオペレータが足踏み操作したとき、デフロックノッチ１６３ａにデフロックピン１６５が対向していない場合でも、復動バネ体１４８に抗してペダル基端部１４１に対しペダル操作部１４２が折曲し、足踏み操作位置にペダル操作部１４２だけが変位する（図９参照）。そして、サイドギヤ１６３の一回転以下の回転にて、デフロックノッチ１６３ａにデフロックピン１６５が対向したとき、復動バネ体１４８力にてペダル基端部１４１も足踏み操作位置に変位して、デフロックノッチ１６３ａにデフロックピン１６５が係合し、差動ギヤ機構１６０を強制的に固定し、左右の後車輪４をデフロック状態（同一回転速度）で駆動する。その結果、デフロックノッチ６３ａにデフロックピン６５をスムーズに係合でき、左右の後車輪４をデフロック駆動状態に早期に移行できる。 With the above configuration, when the operator steps on the front end side of the pedal operation portion 142 protruding from the pedal guide hole 174 at the rear of the boarding step 10, even if the diff lock pin 165 does not face the diff lock notch 163 a, the return spring The pedal operation part 142 is bent with respect to the pedal base end part 141 against the body 148, and only the pedal operation part 142 is displaced to the stepping operation position (see FIG. 9). When the differential lock pin 165 is opposed to the differential lock notch 163a by one rotation or less of the side gear 163, the pedal base end portion 141 is also displaced to the stepping operation position by the return spring body 148 force, and the differential lock notch 163a. The differential lock pin 165 is engaged with the differential gear mechanism 160 to forcibly fix the left and right rear wheels 4 in the differential lock state (same rotational speed). As a result, the differential lock pin 65 can be smoothly engaged with the differential lock notch 63a, and the left and right rear wheels 4 can be shifted to the differential lock drive state at an early stage.
　図１、図５～図１１に示す如く、ディーゼルエンジン５が搭載された走行機体２と、左右の走行部としての後車輪４にディーゼルエンジン５の動力を伝達するミッションケース１６と、ミッションケース１６に内設する差動ギヤ機構１６０と、差動ギヤ機構１６０の差動伝達動作を係脱可能にロックするデフロックピン１６５を備える走行車両において、デフロックピン１６５を係脱操作する足踏みペダルとしてのデフロックペダル６６を設ける構造であって、デフロックペダル６６は、デフロックピン１６５側に連結するペダル基端部１４１と、オペレータが足踏み操作するペダル操作部１４２にて形成し、ペダル基端部１４１にペダル操作部１４２を折曲可能に連結している。したがって、ペダル操作部１４２を足踏み操作したときに、デフロックピン１６５を非係合状態に簡単に支持できる。デフロックペダル６６の足踏み操作にて、差動ギヤ機構１６０にデフロックピン１６５を係合させるとき、デフロックピン１６５が係合位置にないときにも、ペダル操作部１４２が足踏み位置に支持されるから、デフロックピン１６５が係合するまでの間、オペレータが高い足踏み位置を維持する必要がなく、デフロックペダル６６の足踏み操作性を向上できる。また、ペダル操作部１４２の足踏み操作状態を容易に継続できるから、デフロックペダル６６操作が不適正に行われる不具合を低減でき、差動ギヤ機構１６０にデフロックピン１６５を適正に係合できる。 As shown in FIGS. 1 and 5 to 11, a traveling machine body 2 on which a diesel engine 5 is mounted, a transmission case 16 for transmitting the power of the diesel engine 5 to the rear wheels 4 as left and right traveling units, and a transmission case 16 Diff lock as a foot pedal for engaging and disengaging the differential lock pin 165 in a traveling vehicle including a differential gear mechanism 160 installed in the vehicle and a differential lock pin 165 for releasably locking the differential transmission operation of the differential gear mechanism 160 The differential lock pedal 66 is formed by a pedal base end portion 141 connected to the differential lock pin 165 side and a pedal operation portion 142 that is stepped on by an operator, and the pedal base end portion 141 is operated by a pedal. The part 142 is connected so that it can be bent. Therefore, the differential lock pin 165 can be easily supported in the disengaged state when the pedal operation unit 142 is stepped on. When the differential lock mechanism 165 is engaged with the differential gear mechanism 160 by the stepping operation of the differential lock pedal 66, the pedal operation unit 142 is supported at the stepping position even when the differential lock pin 165 is not in the engagement position. Until the differential lock pin 165 is engaged, it is not necessary for the operator to maintain a high stepping position, and the stepping operability of the differential lock pedal 66 can be improved. In addition, since the stepping operation state of the pedal operation unit 142 can be easily continued, the problem that the differential lock pedal 66 is inappropriately operated can be reduced, and the differential gear mechanism 160 can be properly engaged with the differential lock pin 165.
　図５～図１０に示す如く、ペダル基端部１４１に対してペダル操作部１４２を非折曲状態に弾圧させる復動手段としての復動バネ体１４８を設けている。したがって、ペダル操作部１４２を足踏み操作した状態下で、デフロックピン１６５を非係合状態から係合状態にスムーズに移行させることができる。 As shown in FIGS. 5 to 10, a return spring body 148 is provided as a return means for pressing the pedal operating portion 142 in a non-bent state against the pedal base end portion 141. Therefore, the differential lock pin 165 can be smoothly shifted from the non-engaged state to the engaged state under the state where the pedal operation unit 142 is stepped on.
　図５～図１０に示す如く、ペダル操作部１４２の足踏み操作にて、ペダル基端部１４１に対してペダル操作部１４２が折曲して、デフロックピン１６５が非係合位置に支持された状態において、ペダル基端部１４１と前記ペダル操作部１４２を非折曲状態に連結する復動バネ体１４８の復動力によって、デフロックピン１６５が係合操作状態に維持されるように構成している。したがって、ペダル操作部１４２を足踏み操作した状態下で、ペダル基端部１４１に対するペダル操作部１４２の姿勢を折曲状態から非折曲状態にスムーズに復帰させることができる。 As shown in FIGS. 5 to 10, when the pedal operation portion 142 is stepped on, the pedal operation portion 142 is bent with respect to the pedal base end portion 141, and the differential lock pin 165 is supported in the non-engagement position. The differential lock pin 165 is maintained in the engaged operation state by the return force of the return spring body 148 that connects the pedal base end portion 141 and the pedal operation portion 142 in a non-bent state. Therefore, the posture of the pedal operation unit 142 with respect to the pedal base end portion 141 can be smoothly returned from the bent state to the non-bent state under the state where the pedal operation unit 142 is stepped on.
２　走行機体
４　後車輪（走行部）
５　ディーゼルエンジン
１６　ミッションケース
６６　デフロックペダル（足踏みペダル）
１４１　ペダル基端部
１４２　ペダル操作部
１４８　復動バネ体（復動手段）
１６０　差動ギヤ機構
１６５　デフロックピン 2 traveling machine body 4 rear wheel (traveling part)
5 Diesel engine 16 Mission case 66 Differential lock pedal (foot pedal)
141 Pedal base end 142 Pedal operation unit 148 Return spring body (return means)
160 Differential gear mechanism 165 Differential lock pin

Claims (3)

  1. 　エンジンが搭載された走行機体と、左右の走行部に前記エンジンの動力を伝達するミッションケースと、前記ミッションケースに内設する差動ギヤ機構と、前記差動ギヤ機構の差動伝達動作を係脱可能にロックするデフロックピンを備える走行車両において、
    　前記デフロックピンを係脱操作する足踏みペダルを設ける構造であって、前記足踏みペダルは、前記デフロックピン側に連結するペダル基端部と、オペレータが足踏み操作するペダル操作部にて形成し、前記ペダル基端部に前記ペダル操作部を折曲可能に連結したことを特徴とする走行車両。     A traveling machine body on which an engine is mounted, a transmission case that transmits the power of the engine to the left and right traveling parts, a differential gear mechanism that is installed in the transmission case, and a differential transmission operation of the differential gear mechanism. In a traveling vehicle having a diff lock pin that removably locks,
    A step pedal for engaging and disengaging the differential lock pin, wherein the step pedal is formed by a pedal base end portion connected to the differential lock pin side and a pedal operation portion that is operated by an operator; A traveling vehicle characterized in that the pedal operation portion is connected to a base end portion so as to be bendable.
  2. 　前記ペダル基端部に対して前記ペダル操作部を非折曲状態に弾圧させる復動手段を設けたことを特徴とする請求項１に記載の走行車両。 The traveling vehicle according to claim 1, further comprising a return means for pressing the pedal operation portion in a non-bent state with respect to the pedal base end portion.
  3. 　前記ペダル操作部の足踏み操作にて、前記ペダル基端部に対して前記ペダル操作部が折曲して、前記デフロックピンが非係合位置に支持された状態において、前記ペダル基端部と前記ペダル操作部を非折曲状態に連結する復動バネ力によって、前記デフロックピンが係合操作状態に維持されるように構成したことを特徴とする請求項１に記載の走行車両。 In a state where the pedal operation portion is bent with respect to the pedal base end portion by the stepping operation of the pedal operation portion, and the differential lock pin is supported at the non-engagement position, the pedal base end portion and the pedal base end portion 2. The traveling vehicle according to claim 1, wherein the differential lock pin is maintained in an engagement operation state by a return spring force that couples the pedal operation unit to a non-bent state.
PCT/JP2014/070245 2013-08-09 2014-07-31 Travel vehicle WO2015019944A1 (en)

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JP2013166351A JP2015033945A (en) 2013-08-09 2013-08-09 Traveling vehicle
JP2013-166351 2013-08-09

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WO2015019944A1 true WO2015019944A1 (en) 2015-02-12

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5395787U (en) * 1977-01-05 1978-08-04
JPS55151622U (en) * 1979-04-18 1980-11-01
JPS5731231U (en) * 1980-07-30 1982-02-18
JPS61161125U (en) * 1985-03-29 1986-10-06

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5395787U (en) * 1977-01-05 1978-08-04
JPS55151622U (en) * 1979-04-18 1980-11-01
JPS5731231U (en) * 1980-07-30 1982-02-18
JPS61161125U (en) * 1985-03-29 1986-10-06

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