CN203528590U - Operation vehicle - Google Patents

Abstract

The utility model provides an operation vehicle comprising a running vehicle body (2); axle shells (51) disposed under the running vehicle body (2) and provided with axles (50) inside; steering shaft shells (54) connected with both ends of the axle shells (51) and provided with vertical steering shafts (55); tail end shells (59) provided with wheel axles (66), embedded in the lower portion sides of the steering shaft shells (54) and capable of rotating with the steering shafts (55) as centers; rotary components (62) disposed on the tops of the steering shaft shells (54) and capable of freely rotating about the axes of the steering shafts (55); and connecting components (63) connecting the rotary components (62) and the tail end shells (59). The connecting components (63) are provided with ring parts (63a) externally disposed on the steering shaft shells (54) in an embedded manner. According to the utility model, a light and chip support structure for control wheels can be obtained for vehicles with relatively high bottommost surface.

Description

Working truck

Technical field

Utility model relates to the working truck of agricultural tractor, riding supervisor etc., relates in particular to the improvement of handling by the supporting construction of wheel.

Background technology

, the end shell at bottom installing wheel is configured to longitudinally longer in the past, there is following agricultural operation vehicle,, minimum floor level was set highly as far as possible.In this agricultural operation vehicle, by turning to axle housing that above-mentioned end shell is turned to and rotates the earth's axis freely and be supported on axletree housing around the pivoting point of above-below direction, endways shell top and turn to axle housing top with connecting member link with can around and the rotatable parts that arrange of the steering shaft concentric mode of rotating between, on this connecting member, arrange and handle track arm that cylinder mechanism links, the coupled arm (patent documentation 1) that links pull bar.

Prior art document

Patent documentation

Patent documentation 1: No. 3114207 communique of Japanese Patent

Yet, in the working truck shown in patent documentation 1, owing to linking track arm, coupled arm on connecting member, when turning to interlock, on connecting member, apply the control loads of push-and-pull, therefore need, for guaranteeing the structure of its intensity, to hinder lightness and cost degradation.

Utility model content

Utility model problem to be solved is as follows.

The utility model In view of the foregoing, provides a kind of and especially guarantees that lowest bottom surface height is needed greatly, the connecting member of agriculture working truck is configured to the supporting construction of wheel for long up and down light-duty and cheap manipulation.

The method that solves problem is as follows.

In order to achieve the above object, the utility model of scheme 1 is a kind of working truck, it is characterized in that, possesses: running vehicle body; Be arranged on the below of this running vehicle body and the axletree housing of internal axle; Link with the both ends of this axletree housing and possess above-below direction steering shaft turn to axle housing; Possess axletree and be entrenched in the above-mentioned lower side of axle housing and the end shell that turns to axle housing to rotate with respect to this of turning to centered by steering shaft; Be arranged on and turn to the top of axle housing and around above-mentioned steering shaft axle center, rotate rotatable parts freely; And the connecting member that links above-mentioned rotatable parts and end shell, outside arranging, be embedded in the annulus that turns to axle housing on this connecting member.

The rotation of axletree is delivered to axletree via steering shaft, and the wheel being assemblied on axletree is driven.By according to from the rotary manipulation of steering handwheel and with knot part push-and-pull interlock, thereby the axle housing that turns to that end shell supports steering shaft with respect to axle can rotate centered by steering shaft, end shell arranges in the mode that can rotate around this steering shaft, and the actuating force that obtains push-and-pull connecting member by the rotary manipulation from steering handwheel makes end shell rotation interlock.On connecting member, form annulus and be connected with turning to axle housing, therefore, when connecting member is subject to actuating force, can rotate with confined state.

In addition, the utility model of scheme 2 is according to the working truck of scheme 1, it is characterized in that, in axletree housing, the end of axletree arranges driving finishing bevel gear cuter, driven wheel of differential turning to upper bearing support and steering shaft and the engagement of this driving finishing bevel gear cuter of axle housing, arranges annulus in being closely close to of this bearings portion.

The bearings portion of steering shaft and driven wheel of differential becomes enhancing structure, can bear securely actuating force by annulus.

In addition, the utility model of scheme 3, according to the working truck of scheme 1 or 2, is characterized in that, possesses the coniform portion more diminishing more gradually to lower diameter turning on axle housing, in this coniform portion, annulus is set.

With respect to coniform portion, make annulus insert and lead to assemble from minor diameter part.

In addition, the utility model of scheme 4, according to the working truck described in scheme 1～3 any one, is characterized in that, will be arranged on annulus with the track arm of handling the piston rod interlock of cylinder mechanism.

Utilized the actuating force of track arm to pass to annulus, and by connecting member, end shell has been rotated.

The effect of utility model is as follows.

In the past, track arm is setovered and is installed from end shell, due to rotatable parts freely of the rotation that is arranged on the top that turns to axle housing or be arranged on certain on connecting member, if therefore minimum floor level is high,, applying forcefully flexure stress for making on the structure of each portion that end shell rotates, there is easily damaged problem.

To this, the utility model according to scheme 1 to scheme 4, by turning to the upper side of axle housing that annulus is set, can not apply N/R flexure stress to the connecting member for end shell is rotated.In addition, by turning to axle housing to make roughly coniform that downward its diameter diminishes from tubular top, can form at an easy rate annulus and bottom cylinder portion with less number of components.In addition, by connecting member and annulus are structure as a whole, can form at an easy rate this structure with less number of components.In addition, by annulus configuration track arm, can form in highly high position track arm and the pull bar of interlock with it, can guarantee that the minimum ground of running vehicle body is high.

Accompanying drawing explanation

Fig. 1 is the unitary side view that liquid is sowed Operation Van.

Fig. 2 is the front view that liquid is sowed Operation Van.

Fig. 3 is the back view that liquid is sowed Operation Van.

Fig. 4 is the birds-eye view that liquid is sowed Operation Van.

Fig. 5 means the front view of sowing operating condition.

Fig. 6 is the sectional view of transmission device portion.

Fig. 7 is the front view of transmission device portion periphery.

Fig. 8 is the birds-eye view of transmission device portion periphery.

Fig. 9 is the birds-eye view that front axle and the partial cutaway of handling cylinder mechanism are dissectd.

Figure 10 is A-A cutaway view of Fig. 9.

Figure 11 decomposes the also birds-eye view of biopsy cavity marker devices by front axle left and right.

Figure 12 (A) means the front view of the non-swing state of front axle housing, and Figure 12 (B) means the front view of swing state.

Figure 13 (A) is the back side cutaway view of the near front wheel driving section, and Figure 13 (B) is the back view of end shell.

Figure 14 (A) is the vertical view cutaway drawing that turns to axle housing, and Figure 14 (B) is the local enlarged side view of connecting member.

Figure 15 is front axle and the front view of handling cylinder mechanism.

Figure 16 means the summary rearview of the stationary state of the near front wheel lateral bracing strut and ball-joint.

Figure 17 means the manipulation of front and back wheel and the birds-eye view of interlock state.

Figure 18 means the manipulation of front and back wheel and the lateral plan of interlock state.

Figure 19 is the rear cutaway view of left rear wheel driving section.

In figure:

E-driving engine, 10-plant protection pump, 21-gearbox body, 22-speed change input shaft, 23-master clutch, 24-PTO axle, 24a-sleeve-like part, 24b-internal gear clutch, 26-the first transmission system (secondary speed-changing device), 27-the second transmission system (main transformer speed variator), 48-PTO clutch mechanism, 48a-clutch body.

The specific embodiment

Below, with reference to accompanying drawing, the liquid of an embodiment as working truck of the present utility model being sowed to Operation Van describes.In addition, have in the situation of pair of right and left structure member, symbol L refers to left side, and symbol R refers to right side.

Fig. 1 is the lateral plan that liquid of the present utility model is sowed Operation Van.Fig. 2 is the front view that liquid of the present utility model is sowed Operation Van.In addition, these Fig. 1, Fig. 2 represent left and right described later to sow the state that cantilever is accommodated in the left and right sides of running vehicle body.On the other hand, Fig. 3 means that liquid of the present utility model sows the front view that Operation Van sows the state of liquid.

As shown in Figure 1 and Figure 2, at liquid, sow on the running vehicle body 2 of Operation Van 1 and be provided with pair of right and left front- wheel 3L, 3R and pair of right and left trailing wheel 4L, 4R, at the front side portion of running vehicle body 2, plant protection sowing apparatus 11 is installed.

In addition, as shown in Figure 2, at the liquid of present embodiment 1, sow in Operation Van 1, be configured to that minimum ground height H is high, W is large for tyre tread (wheelspan).

Above between pair of right and left front-wheel 3L, the 3R of running vehicle body 2, be equipped with the driving engine E being covered by hood 5.Above between pair of right and left front- wheel 3L, 3R and pair of right and left trailing wheel 4L, 4R, manipulation seat 6 is set, in the place ahead of handling seat 6, is provided with control wheel 7.

If handle to the left and right control wheel 7, as described later, pair of right and left front- wheel 3L, 3R and pair of right and left trailing wheel 4L, phase reversal ground, 4R simultaneous linkage ground are handled, as turning little curved four-wheel handle structure of travelling.

In addition, to surround the mode of the surrounding that handles seat 6, load and unload spray tank 9 be set freely, handle seat 6 below be provided with plant protection pump 10.

In addition, as shown in Figure 4, plant protection sowing apparatus 11 comprises: the central authorities that are positioned at body the place ahead sow cantilever 11C; And be arranged on the left and right side that central authorities sow the left and right sides of cantilever 11C and sow cantilever 11L, 11R.

And, utilize lift cylinders 15(with reference to Fig. 1) make 11 liftings of plant protection sowing apparatus, be configured to and utilize opening/closing lever 17L, 17R(with reference to Fig. 4) make left and right side sow cantilever 11L, 11R to sow operating condition (with reference to Fig. 5) and with the state folding and unfolding (with reference to Fig. 1～Fig. 4) of two sides along running vehicle body 2 for separately outstanding to the left and right respectively.

And the liquid of spray tank 9 is delivered to plant protection sowing apparatus 11 by plant protection pump 10, from being arranged on, central authorities sow cantilever 11C and left and right side is sowed a plurality of nozzles 14,14 of sowing cantilever 11L, 11R ... sow liquid (with reference to Fig. 1,5).

Secondly, based on Fig. 6～Fig. 8, to being subject to the power of driving engine E, to the variable transmission mechanism that each portion transmits variable-speed dynamic, describe.Between the output shaft 20 of the coaxial support of the crank shaft with driving engine E (not shown) and gearbox body 21 side speed change input shafts 22, master clutch 23 is installed.This master clutch 23 adopts the known structure of multi-plate clutch form, makes the pedal of clutch 23a that is provided in the ground board of handling seat 6 bottoms by entering into, and interlock becomes to disconnect the structure of the power of normal coupled condition.

The power that has passed through above-mentioned master clutch 23 makes the transmission device interlock in gearbox body 21 via speed change input shaft 22, this gearbox body 21 is the structures of the 21f of case portion, 21r before and after engaging, makes the structure that supports various variable shafts etc. in the bearing wall portion of gearbox body 21 front and back.

Above-mentioned speed change input shaft 22 rearward extends and is supported in gearbox body 21 and forms gear axle, and a plurality of variable gears are set.Be at the rear wall parts axle support of change speed gear box body 21r and the PTO axle 24 of speed change input shaft 22 concentrics, at the hub-like part 24a of front end, bearing be set to support the structure of the rear end of above-mentioned speed change input shaft 22.In addition, in the present embodiment, PTO axle 24 is made as and drives 10 special uses of aftermentioned plant protection pump, and the belt wheel from axle head 31 is configured to as described later and can be with transmission to the input belt wheel 12 that is arranged on the plant protection pump 10 of handling seat 6 belows.

With above-mentioned speed change input shaft 22, the first countershaft 25 is set abreast.And, by being arranged on the selection of the gear teeth wheels between this first countershaft 25 and above-mentioned input variable shaft 22, formation is as 3 grades of secondary speed-changing devices 26 of the first transmission system, and formation can select 2 grades of advance side height and retreating the main transformer speed variator 27 of 1 grade as the second transmission system.And be following structure: from the power of speed change input shaft 22 via with below the first transmission system 26(, secondary speed-changing device 26) after the speed change level after speed change, below the second transmission system 27(, main transformer speed variator 27) 2 grades of the height or retreat the level of speed change arbitrarily of 1 grade and drive front-wheel 3 and trailing wheel 4 of advancing.

, the secondary speed-changing device 26 that main folding and unfolding is configured in the 21r of back cover portion of gearbox body 21 is fixed on speed change input shaft 22 and three pieces of different secondary variable gear 28a of gear diameter is set, 28b, 28c, and the secondary speed change cliding gear 29 of selecting these secondary variable gear 28a～28c is set in the first countershaft 25 sides, make large diameter gear 29b and above-mentioned secondary variable gear 28b engagement in 2 grades of gears of this cliding gear 29, the structure of small-diameter gear 29c and secondary variable gear 28c engagement, with the integrally formed small-diameter gear 29a of the shaft sleeve part 29d of cliding gear 29 be rotate be supported on freely on the first countershaft 25 and with always with the structure of the inner gear 30a engagement of the counter shaft gear 30 of above-mentioned secondary variable gear 28a engagement.Due to such formation, therefore by secondary speed change cliding gear 29 is slided, and make the inner gear 30a engagement of small-diameter gear 29a and counter shaft gear 30, thereby obtain secondary speed change the first speed, by 2 grades of large diameter gear 29b and secondary variable gear 28b in gear are meshed, thereby obtain secondary speed change the second speed, by small-diameter gear 29c and the secondary variable gear 28c of 2 grades of gears are meshed, thereby obtain secondary speed change the 3rd speed.

The above-mentioned shaft sleeve part 29d of above-mentioned secondary speed change cliding gear 29 and 2 grades of gears form respectively, with the engagement assembly claw power-transfer clutch 29e of portion always, make it chimeric sliding freely with the spline being formed on the first countershaft 25.

In folding and unfolding, in the part of the 21f of fore shell portion of gearbox body 21, main transformer speed variator 27 is set.Select 2 grades of main transformer speed height and retreat shelves, the propulsive effort after the secondary speed change of above-mentioned the first countershaft 25 is delivered to the second countershaft 35.

, at the gapped chimeric intermediate gear 36 for shelves that retreats of the leading section of the first countershaft 25, the chimeric intermediate gear 37 for low speed with a gap in the front side of the counter shaft gear 30 of above-mentioned secondary speed-changing device 26 sides.And the main transformer ski-running moving gear 38 that slide freely chimeric at the spline part with the second countershaft 35, forms in front and back centered by a high speed with intermediate gear 38a and retreats shelves inner gear 38b, middle inner gear 38c for low speed.In addition, in above-mentioned speed change, with axle on input shaft 22, support the counter shaft gear 39 of just converting, can make just to convert counter shaft gear 39 and this speed change with the irrelevant to rotation of input shaft 22 be rotate.On just converting counter shaft gear 39, this forms counter shaft gear 39a and high speed counter shaft gear 39b for low speed that diameter is different.

Just the convert counter shaft gear 39c integrally formed with the shaft sleeve part of the above-mentioned counter shaft gear 39 of just converting always meshes with the just conversion transmission gear 40 of the second countershaft 35, it is above-mentioned that to retreat shelves identical with intermediate gear 36, be always with the structure for transmission gear 41 engagement for shelves that retreats of the second countershaft 35.

If make the low speed of above-mentioned main transformer ski-running moving gear 38 chimeric with intermediate gear 37 with middle inner gear 38c and low speed, the rotary power after the secondary speed change of the first countershaft 25 via intermediate gear 37 for this low speed, counter shaft gear 39a for low speed, just the counter shaft gear 39c that converts drives the transmission gear 40 of just converting, and to the second countershaft 35, transmits low speed forward power.If the high speed of main transformer ski-running moving gear 38 is meshed with using at a high speed counter shaft gear 39b with intermediate gear 38a, the power of the first countershaft 25 via at a high speed with intermediate gear 38a, at a high speed with counter shaft gear 39b, the counter shaft gear 39c driving transmission gear 40 of just converting of converting just, to the second countershaft 35 transmission high speed forward power.

In addition, if make main transformer ski-running moving gear 38 retreat shelves with inner gear 38b with to retreat shelves use intermediate gear 36 chimeric, the rotary power after the main transformer speed of the first countershaft 25 drives this to retreat intermediate gear 36 for shelves, retreats transmission gear 41 for shelves, to the second countershaft 35, transmits and retreats a grade power.

The major and minor variable speed drive (VSD) power of above-mentioned the second countershaft 35 is via slowing down by intermediate drive gear group 42,43 to the transmission shaft 44 that travels.The transmission shaft 44 that travels is outstanding to the front and back of gearbox body 21, the spline shaft 44a of rear portion side via rear propeller shaft 44r with trailing wheel modified roll mechanism interlock, via back axle, drive trailing wheel 4L, 4R, the spline shaft 44b of toe lateral drives front-wheel modified roll mechanism 58 described later via front propeller shaft 44f, and drives front-wheel 3,3.

In addition, the main shift lever 46 of above-mentioned main transformer speed variator 27, the secondary shifter bar 47 of secondary speed-changing device 26 are arranged side by side handling seat 6 left sides, can carry out variable speed operation along the guide of fore-and-aft direction.In addition, on the right side of this manipulation seat 6, possess PTO bar 49, this PTO bar 49 switches to the PTO clutch mechanism 48 being provided on above-mentioned PTO axle 24 connection, disconnects.

, PTO clutch mechanism 48 possesses the internal gear clutch 24b in week in the front end of the above-mentioned hub-like part 24a that is formed at above-mentioned PTO axle 24 front ends and the clutch body 48a that is supported on the spline part at the rear portion that is formed at above-mentioned speed change input shaft 22, makes that this clutch body 48a follows moving forward and backward of mobile device 48b and the structure that makes clutch body 48a coordinate, depart from internal gear clutch 24b.Mobile device 48b is the structure with above-mentioned PTO bar 49 interlocks.The mobile device strut member 48c of fastening mobile device 48b is supported on gearbox body 21, this gearbox body 21 can reciprocatingly slide abreast with speed change input shaft 22, this mobile device strut member 48c from gearbox body 21 outstanding rear end side rearward, via interlock link rod 48d, be connected with the base end part of PTO bar 49.The structure of PTO bar 49 is as follows: its base end side 49a rotates and be arranged on freely travel side's side (being right travel framework 2R side) of framework 2L, 2R of the pair of right and left that forms running vehicle body 2 in legend, the handle part side 49b of bending is arranged to take this installation base portion side 49a and can operates in swing as axle center core, by swinging operation forwards, connect above-mentioned engaged clutch mechanism 48, by the swinging operation at the rear to contrary, cut off above-mentioned engaged clutch 48(Fig. 7 of mechanism).

In the rear portion side of the above-mentioned transmission shaft 44 that travels, and link freely on the fixing 21m of metal portion in the rear wall handling with gearbox body 21, brake unit 45 is set.This brake unit 45 is by making the brake plate of many plates contact with the 21m of metal portion wall the structure that the transmission shaft 44 that travels is braked.Thus, four-wheel is all around carried out to braking maneuver simultaneously.

As mentioned above, for following structure: by being made as coaxial with master clutch 23, PTO axle 24 is configured in to the rear of gearbox body 21, from the rear wall of gearbox body 21 rearward the belt wheel 31 of outstanding shaft rear end by band, the transmission around the belt wheel 12 that hangs over the plant protection pump 10 approaching with sidepiece drives this pump 10.Plant protection pump 10 is and spreads all over above-mentioned a pair of size of travelling between framework 2L, 2R, and the bracket 32,32 that the 10a of body portion is arranged on left driving framework 2L by setting is fixing.

Via master clutch 23, accepting, between the speed change input shaft 22 of engine power and PTO axle 24, PTO clutch mechanism 48 is set, thus, even if above-mentioned master clutch 23 is connected, plant protection pump 10 also can be by PTO bar 49 operation and with the connection of this PTO clutch mechanism 48, disconnect interlock, operator can at random select to set pump driving condition, non-driven state.

PTO clutch mechanism 48 is made all formed internal gear clutch 24b in the front end making with the hub-like part 24a of the front end of the PTO axle 24 of the coaxial setting of speed change input shaft 22 and is supported on that clutch body 48a on the formed spline part in rear portion of speed change input shaft 22 follows moving forward and backward of mobile device 48b and the structure that coordinates or depart from, but due to the structure being originally in the rearward end of this hub-like part 24a axle supporting speed change input shaft 22, therefore on gearbox body 21, do not need special supporting construction, can reduce costs by simplified structure.

Speed change input shaft 22 and first countershaft 25 parallel with this speed change input shaft 22 are set, by being arranged on the selection of the gear teeth wheels between this first countershaft 25 and above-mentioned input variable shaft 22, form the first transmission system and the second transmission system, that the power of speed change input shaft 22 is via after the speed change level by after the first transmission system 26 speed changes, via the high low speed of advancing of the second transmission system 27 or the speed change level that retreats shelves, drive the structure of front-wheel 3 and trailing wheel 4, although form first, two transmission systems, but its speed change output does not affect the rotation of speed change output shaft 22 and PTO axle 24.

As shown in Fig. 6,8, the clutch-bell cover 34 of the 23a of the shell that covers above-mentioned master clutch 23 is set.This clutch-bell cover 34 forms while overlooking and is U shape, and base portion 34a, 34a handling are arranged on the antetheca of above-mentioned gearbox body 21 freely, and form bearing portion 34b in the wall portion that is formed at front side.Make above and present master clutch 23 main bodys below but above by the structure of the outer thin-plate member covering of figure.And be the structure with the output shaft 20 of the crank shaft interlock of above-mentioned driving engine E in above-mentioned bearing portion 34b support.If form like this, the supporting construction of output shaft 20 and gearbox body 21 become one, and realize the raising of its precision when assembling master clutch 23.

Above-mentioned gearbox body 21 is to the installation of running vehicle body 2 as shown in Fig. 7 waits, and travel framework 2L, 2R of the pair of right and left before and after spreading all over integrally arranges base component 2B, 2B, be on this base component 2B, 2B from side the structure of fastening gearbox body 21.

Follow the change of the size specification of above-mentioned plant protection pump 10, pump mounting space is changed to large or little, makes the installation site of this gearbox body 21 on fore-and-aft direction, change with respect to travel framework 2L, 2R if be configured to, and can guarantee above-mentioned mounting space.

Secondly, use Fig. 9～Figure 13 (A), figure (B) to describe front wheel drive mechanism and steering unit.

At this, Fig. 9 is the approximate vertical view of the local section of front axle housing, and Figure 10 means the skeleton diagram of the A-A section of Fig. 9.

Below the front side of running vehicle body 2, dispose and take in for by the front axle housing 51 of the propulsive effort front axle 50 that a pair of front-wheel 3,3 transmits to the left and right etc.

Central rear at above-mentioned front axle housing 51 forms cylindric shaft sleeve part 51A, this cylindric shaft sleeve part 51A axle supporting via front propeller shaft 44f with the front-wheel input shaft 52 of above-mentioned transmission shaft 44 interlocks that travel, the finishing bevel gear cuter 52a of this front-wheel input shaft 52 and the front-wheel modified roll mechanism 53 that is provided in axletree housing 51 central portions.The front axle 50 extending to the left and right from front-wheel modified roll mechanism 53 is linked by finishing bevel gear cuter 56,57 and the steering shaft that turns to axle housing 54 55 that is connected in the left and right end portions of axletree housing 51.In addition, at this, finishing bevel gear cuter 56 is arranged on front axle 50 ends, and finishing bevel gear cuter 57 is the driven wheel of differential of this finishing bevel gear cuter 56, and axle is bearing in the top of steering shaft 55.

At this, above-mentioned front axle housing 51 is elaborated.

Figure 11 is the decomposition plan view of 51 of the front axle housings of Fig. 9, the form that front axle housing 51 is cut apart for left and right, wherein, in left side, cut apart and on half 51L of, form the cylindric shaft sleeve part 51A in above-mentioned front and back, 51B, and, in internal bearings, support the front-wheel input shaft 52 that is directly supported on cylindric shaft sleeve part 51A, large footpath finishing bevel gear cuter 100 with the miniature gears engagement of this front-wheel input shaft 52, forming can the above-mentioned front-wheel modified roll mechanism 53 of folding and unfolding, and in can the above-mentioned front axle 50 of folding and unfolding, a part of roughly all and right side front axle 50R of left front axle 50L.Form and on a side right side, cut apart pars intermedia that half 51R of can folding and unfolding right side front axle 50R with trailing portion and differential-speed lock mechanism 101.

102, bearing cutting apart the above-mentioned large footpath finishing bevel gear cuter 100 of half 51L of in left side, cuts apart half 51R of with right side and carries out flange and engage and use bolt 103 freely to load and unload, and direct of travel axis X during joint becomes the left and right line of centers of front axle housing 51 integral body.Therefore, front axle housing 51 can left and right balance swing around this axis X well.And the division plane of axletree housing 51, as 102, the bearing of large footpath finishing bevel gear cuter 100, therefore can be guaranteed the intensity of division plane.

In the left side of above-mentioned front axle housing 51, cut apart half 51L of, on pars intermedia, form with engaging of framework is fixing and use pedestal 51aL, on right side, cut apart half 51R of and form the fixing pedestal 51aR that uses of same joint.These fixing with pedestal 51aL, 51aR owing to being front axle housing 51 and the member of the situation of back axle housing 88 common-use sizes described later, so be the structure that back axle housing 88 can be arranged on to the upper set installing frame 104 of framework 2L, 2R that travels of running vehicle body 2.In the situation that being side's front axle housing 51, do not need the function as fixed base, but have concurrently, utilize the function that swings killer around the conduct of the wobbling action of axle center, front and back X., fixing with pedestal 51aL or 51aR, be to swing to upward the structure (Figure 12 (B)) of touching with travel framework 2L or 2R, these are fixing plays the function as killer with pedestal 51aL, 51aR, so does not need special limiter structure.

In addition, left and right side is cut apart the end side separately of half 51L of, 51R, forms flange 51Lb, 51Rb that handling engage the aftermentioned tubular top 54a that turns to axle housing 54 freely.

On the right side of above-mentioned front axle housing 51, cut apart the operation linkage part 105 that half 51R of possesses above-mentioned differential locking-device (デ Off ロ ッ Network) mechanism 101.On the swivel 105b of and rotation chimeric with shaft sleeve part 105a, the work pin 105c configuring in eccentric mode is set, the rotary work of accompanying rotation body 105c, this work pin 105c side-to-side movement, this side-to-side movement is delivered to the slip claw of differential-speed lock mechanism 101, can switch to differential locking-device state or non-differential locking-device state.In addition, owing to cutting apart the patent part side of half 51L of with left side, form differential-speed lock mechanism 101, therefore easily assembling.In addition, swivel 105b can be rotated operation and locked by peripheral operation and via working arm 105d.The direction that this working arm 105 is always removed to differential locking-device by spring is afterburning.

As mentioned above, by front axle housing 51 being formed to left and right side, cut apart half 51L of, 51R, particularly, be formed at that the front and back tubular shaft sleeve part 51A of half 51L of is cut apart in left side, the structure of 51B is made at swinging center, therefore, although require high-precision coaxial degree processing, but due to be divided into before and after being formed integrally as cut after the 51L of left side divided, operability is also easy, therefore, not only easily carries out machine up but also easily guarantees above-mentioned precision.

Owing to cutting apart left side 51L configuration input shaft 52, large footpath finishing bevel gear cuter 100, modified roll mechanism 53, left and right axletree 50L, 50R, so the state before can cutting apart half 51R of on link joint right side carries out the confirmation of the spinning movement of input and output shaft.

As shown in Figure 13 (A), Figure 13 (B), turn to axle housing 54 to comprise: axletree housing 51 to the distolateral outer chimeric part of terminal; Via the flange of this axletree housing 51, link and outstanding tubular top 54a upward; Along with the coniform 54b of portion that reaches lower diameter and diminishingly form; And rotate freely support tool for the tubular bottom 54c of the end shell 59 of bearing 58 around steering shaft 55, possess above-mentioned steering shaft 55 and from the end of front axle 50 to the finishing bevel gear cuter 56,57 of steering shaft 55.In addition, end shell 59 axles supportings fronts wheel spindle 66, these front wheel spindle 66 supports right front-wheels 3, possess steering shaft 55 lower end finishing bevel gear cuter 60 and with the driven wheel of differential 61 of these finishing bevel gear cuter 60 engagements.In addition, end shell 59 by from outside the chimeric bottom fitting portion 59a that turns to axle housing 54, link with the lateral surface of this fitting portion 59a and the side surface part 59b that surrounds above-mentioned driven wheel of differential 61 forms.

Turn to the steering shaft 55 of axle housing 54 be arranged to lower end side with respect to plumb line the heeling condition towards car body foreign side, end shell 59, the built-in transmission devices such as finishing bevel gear cuter and front-wheel 3 are arranged to freely rotate around the steering shaft 55 of this inclination.

At the above-mentioned top of the tubular top 54a of axle housing 54 that turns to, form shaft sleeve part 54d, utilize connecting member 63 along turning to axle housing 54 to link freely with respect to this shaft sleeve part 54d and rotate chimeric freely rotatable parts 62 and above-mentioned end shell 59 via sleeve with hanging like handling.Above-below direction middle part at this connecting member 63 forms annulus 63a, and it is outside that this annulus 63a is entrenched in the above-mentioned coniform 54b of portion of axle housing 54 that turns to., be via sleeve, to rotate the structure of chimeric flange shape annulus 63a freely in the outside of the coniform 54b of portion.On this annulus 63a, install with aftermentioned and handle cylinder mechanism interlock and end shell 59 is rotated to the track arm 64 of handling.

For the annulus 63a of above-mentioned connecting member 63, its upper-lower position for support be arranged on position that the required thickness of the driven wheel of differential 57 on steering shaft 55 tops is large under, the part that in axle housing 54, intensity ratio is higher is chimeric with turning to.Therefore, although concentrate the actuating force from manipulation cylinder mechanism being subject to via track arm 64 transmission, but because forming endless member 63a and be entrenched in, connecting member 63 turns to axle housing 54 outsides, therefore the control loads that is delivered to track arm 64 is by turning to axle housing 54 to share acceptance, prevents thus the distortion of connecting member 63 or crooked.And by the position configuration of endless member 63a is turned to being closely close to of the steering shaft 55 of axle housing 54 and the required part that forms wall thickness of the bearing portion of finishing bevel gear cuter 57 in support, thereby present for bearing the reinforcement structure of above-mentioned control loads, therefore can the coniform 54b of portion that does not directly bear control loads be formed thinly as far as possible.

In addition, side, the front side 63af of annulus 63a has and take the direct of travel F of running vehicle body 2 and towards the near front wheel 3L, roll the dip plane shape of oblique predetermined angular β as benchmark.In addition, the track arm above 64 that is fixed on this annulus 63a is same with side, the front side 63af of annulus 63a, and the direct of travel F of take fixes (Figure 14 (A)) towards the near front wheel 3L inclination predetermined angular γ as benchmark.

In need to making the agricultural operation vehicle that minimum floor level is high as far as possible, in order not damage crops, need to make the structure that does not become as far as possible obstacle, utilize above-mentioned incline structure, crops are process, not easy damaged crops swimmingly in the bottom of running vehicle body 2.

On the other hand, existing track arm is setovered and is installed from end shell, due to rotatable parts freely of the rotation that is arranged on the top that turns to axle housing or be arranged on certain of member on connecting member, if therefore minimum floor level H is high, can be to there is the problem of easy breakage for making the structure of each portion of end shell rotation apply large flexure stress.

To this, according to the said structure of present embodiment, the upper side that turns to axle housing 54 is the height of configuration track arm 64, annulus 63a is set near this height and can the connecting member 63 for using end shell 59 to rotate not be applied to N/R flexure stress.In addition, by by turning to axle housing 54 to make downward make from tubular top 54a that its diameter diminishes roughly coniform, can form at an easy rate annulus 63a and the 54c of bottom cylinder portion with less number of components.In addition, by connecting member 63 and annulus 63a are made of one to structure, can form at an easy rate this structure with less number of components.

Secondly, the structure of the manipulation cylinder mechanism handling making left and right front-wheel and trailing wheel interlock describes.

In the front lower place of above-mentioned running vehicle body 2, and in the place ahead of front axle housing 51, set the manipulation cylinder mechanism 70 that handles pair of right and left front-wheel 3L, 3R.By pull bar 72L, 72R, the piston rod 71 of this manipulation cylinder mechanism 70 is attached on above-mentioned track arm 64L, 64R respectively.If supply with pressure oil to a side who handles cylinder mechanism 70, piston rod 71 stretches out to the left, via pull bar 72L, track arm 64L is turned left, and left side front-wheel 3L is to anticlockwise (solid arrow in Fig. 9).Now, along with the movement of piston rod 71, the pull bar 72R on right side is pulled, and then pulls track arm 64R, and right side front wheel 3R is also to anticlockwise (dotted arrow).In addition, pull bar 72L, 72R utilize respectively ball-joint 73L, 73R to be attached at the left and right end portions of piston rod 71.Track arm 64L, 64R utilize pair of right and left ball-joint 74L, 74R rotation to link with pair of right and left pull bar 72L, 72R freely.

Figure 14 (B) represents the mounting structure of installing to annulus 63a of above-mentioned track arm 64.Base portion at track arm 64 forms installation portion 64a longitudinally, or additional by methods such as welding, by bolt 67, horizontal bolt 68 are fixed on the base portion of track arm 64 longitudinally.By such formation, without unclamping bolt, just can securely track arm 64 be arranged on connecting member 63.

In Figure 10, the 70a of cylinder body portion that handles cylinder mechanism 70 is that the metal plate component that is bent into passage shape is provided with the only about half of and fixing cylinder housing 75 of outer peripheral face of taking in the cylindrical body of the 70a of cylinder body portion at its recess.

In addition, in the substantial middle of above-mentioned cylinder housing 75, in illustrated example, by welding construction, be provided with integratedly towards rear, be the first cylindric fitting portion 76 that front axle housing 51 sides are extended.The inside of the first cylindric fitting portion 76 forms tubular inner space.Central authorities at the above-mentioned front axle housing 51 of a side, the symmetric position that is front side at the cylindric shaft sleeve part 51A with respect to supporting the rear side of above-mentioned front-wheel input shaft 52, forms chimeric the second cylindric fitting portion 51B that is arranged on the first cylindric fitting portion 76 on above-mentioned cylinder housing 75.And after above-mentioned the first cylindric fitting portion 76 is inserted into the second cylindric fitting portion 51B, its linking portion is by connecting and be fixed as the set pin 77 that prevents from coming off and prevent from rotating the secure component of use.

As mentioned above, central portion at front axle housing 51, the second cylindric fitting portion 51B is set in its front side, cylindric shaft sleeve part 51A is set in the wings, and a pair of support metal parts in front and back (pivot metal piece) 78A, the 78B that centered by the X of axle center, can support rotationally utilize respectively bolt and nut to install securely.In addition, the end face of the side that axletree housing 51 leaves in the past respectively of these support metal parts 78A, 78B is minor diameter part, aft end face and front end face by the restriction end face 78A, the 78b that make to be formed by this minor diameter part and above-mentioned cylindric shaft sleeve part 51A and cylindric chimeric shaft sleeve part 51B are opposed, can limit the skew of the fore-and-aft direction of this front axle housing 51.

At this, with regard to the shape of above-mentioned support metal part 78A, 78B, by will being formed at respectively the cylindric shaft sleeve part 51A of the front and back side of front axle housing 51, the outer shape of the second cylindric fitting portion 51B is configured to identical, can be in front and back these support metal parts of general ground structure 78A, 78B, can cut down parts number of packages.

In addition, in order to control the amount of movement of the piston rod 71 of handling cylinder mechanism 70, via the left and right sides of the support metal part 78B of front side, be connected in the Zuo Shihuo right ventricle in the space of left and right, to across cylinder configuration conduct hydraulic hose 79L, the 79R of row's working oil with the 70a of cylinder body portion that handles cylinder mechanism 70.

In addition, as embody handled as shown in Figure 15 of installing condition of cylinder mechanism 70, hydraulic cylinder mechanism 70 be configured to its lower ora terminalis in the front side of front axle housing 51 for reaching front axle housing below 51., when from top view, be configured to, at the middle position up and down of front axle housing 51, form the cylindric shaft sleeve part 51B in front side, the lower edge that is configured shorter manipulation cylinder mechanism 70 with respect to the lower-upper length of front axle housing 51 is always in than the top side of the lower edge of front axle housing 51.Therefore, handle cylinder mechanism 70 and can not hinder the raising of floor level.In addition, with regard to this configuration status, even if front axle housing 51 swings around axle center X, both relations can not change yet, and with the having that it's too late size independently makes front-wheel corner cut for certain of this swing, can improve maneuvering performance.

In addition, as shown in figure 15, the plane of revolution W angulation θ by the straight line B through steering shaft 55 axle center with the earth point that comprises front-wheel 3, is the structure of V word while making from top view.And the extended line that is set to steering shaft 55 axle center is closely close to crossing relation at grounding parts roughly.Like this, from the manipulation resistance force diminishes on ground, do not need large-scale high-capacity manipulation cylinder., when guaranteeing minimum floor level H in addition, make following structure,, at the outer peripheral face of axletree housing 51 and the outer peripheral face that turns to axle housing 54 large raised line without comparison, can not bring damage to crops.

In addition, an example of axletree housing of the present utility model is corresponding with the axletree housing 51 of present embodiment, and an example of manipulation cylinder maintaining part of the present utility model is corresponding with the cylinder housing 75 of present embodiment.In addition, an example of the first cylindrical shell of the present utility model is corresponding with the first cylindric fitting portion 76 of present embodiment, and an example of the second cylindrical shell of the present utility model is corresponding with the second cylindric fitting portion 51B of present embodiment.In addition, an example of a pair of supporter in front and back of the present utility model is corresponding with a pair of support metal parts in front and back (pivot metal piece) 78A, the 78B of present embodiment.

In addition, the said structure illustrating centered by pair of right and left front- wheel 3L, 3R, substantially similarly applicable for pair of right and left trailing wheel 4L, 4R.

Thus, axletree housing 51 integral body centered by support metal part 78A, 78B when swinging, handle cylinder mechanism 70 also can easily swing centered by identical axle center X, can from axletree housing 51, not form discretely support metal part 78A, the 78B that bears car weight, in addition, owing to being the length of handling cylinder mechanism 70 for bearing, therefore without other setting, firmly keep tool.

Thereby, according to present embodiment, can link axletree housing 51 and handle cylinder mechanism 70 with simple structure, and also can link forcefully in intensity.

Secondly, applicable Figure 13 (A), figure (B), Figure 16 further describe the link structure of pair of right and left track arm 64L, 64R and pair of right and left pull bar 72L, 72R.

Figure 16 is for the summary rearview of the stationary state of the pull bar 72L that links with the near front wheel 3L side and ball-joint 74L is described.

As shown in Figure 13 (A), the central axis B of steering shaft 55 is with respect to plumb line D tilt angle alpha to the inside, to this, handle cylinder mechanism 70 and pull bar 72L, the configuration of 72R approximate horizontal ground, therefore in the present embodiment, make and make ball-joint 74L, 74R that the link of pull bar 72L, 72R and track arm 64L, 64R used as shown in figure 16, tilt angle alpha and be fixed on the structure of the leading section of pull bar 72L, 72R.This tilt angle alpha is consistent with central axis B and the plumb line D angulation of steering shaft 55 shown in Figure 13 (A).By this structure, the action of handling cylinder mechanism 70 is successfully delivered to left and right front- wheel 3L, 3R via pull bar 72L, 72R, ball-joint 74L, 74R, track arm 72L, 72R etc.

In addition, in existing structure, for being fixed on as the crow flies on pull bar and the ball-joint of on even keel configuration, in order to link originally the track arm with turning cylinder (with reference to the steering shaft 55 of Figure 13 (the A)) arranged perpendicular tilting, need to make the part of the shape of track arm itself meet and make oblique shape with the link surface of ball-joint.Therefore, in the prior art, the track arm of left and right separately shape is different.

But according to said structure, owing to making ball-joint 74L, 74R tilt angle alpha as shown in Figure 13 (A) itself, so the left and right of track arm 64L, 64R can be for identical shaped, the number of molds in the time of can cutting down parts and make and the kind of parts.

In addition, in using the illustrated said structure of Figure 13 (A), figure (B), Figure 16, centered by the near front wheel 3L side, be illustrated, but because off front wheel 3R side is also same structure, therefore the description thereof will be omitted.

In addition, the said structure describing centered by pair of right and left front- wheel 3L, 3R, substantially applicable similarly for pair of right and left trailing wheel 4L, 4R.As shown in figure 19, in the left and right of the back axle housing 88 of built-in back axle 92, install and turn to axle housing 86, portion supports steering shaft 87 with inclination attitude axle within it.In the bottom that turns to axle housing 86, around steering shaft 87, rotate support tip shell 93 freely.At the top that turns to axle housing 86, the rotatable parts 80 that setting can be rotated around steering shaft 87 axle center, link this rotatable parts 80 and above-mentioned end shell 93 with connecting member 89.On connecting member 89, as the connecting member 63 of front-wheel 3, with the connecting member 63 with front-wheel 3 sides and the identical structure of annulus 63a, be formed in the chimeric annulus 89a that turns to axle housing 86 midway.

From the propulsive effort of back axle 92 and the transmission that utilizes finishing bevel gear cuter mechanism mutually auxiliary via the hind axle 94 in steering shaft 87, end shell 93, arrive trailing wheel 4.And, 95,96 groups of the finishing bevel gear cuters between formation back axle 92 and steering shaft 87,97,98 groups of the finishing bevel gear cuters between steering shaft 87 and hind axle 94.

Secondly, based on Figure 17, Figure 18 to having utilized the serial verb construction of the manipulation of front-wheel 3 and trailing wheel 4 to describe.

Extend the coupled arm 65 of the aftermentioned front and back pull bar of the above-mentioned rotatable parts 62 formation manipulation interlock front and back wheels of covering shape.Now, at front- wheel 3L, 3R, coupled arm 65L, 65R all as shown in figure 17, extend to the inner side of running vehicle body 2 and form.The coupled arm 81L, the 81R that extend separately of rotatable parts 80L, the 80R of the lid shape of one side's trailing wheel 4L, 4R forms to the lateral of running vehicle body 2.

And, by front and back pull bar 82L, link the coupled arm 65L of above-mentioned the near front wheel 3L and the coupled arm 81L of left rear wheel 4L, by front and back pull bar 82R, link the coupled arm 65R of off front wheel 3R and the coupled arm 81R of off hind wheel 4R.Due to such formation, therefore when left and right front- wheel 3L, 3R left-handed turning to time, left and right trailing wheel 4L, 4R via front and back pull bar 82L, 82R right-hand turning to, can become the left little turning (solid arrow in Figure 17) of the state of four-wheel manipulation.Otherwise, when left and right front- wheel 3L, 3R turn to dextrad, left and right trailing wheel 4L, 4R thereupon left-handed turning to, can to the right little turning (dotted arrow in this figure).

Front and back pull bar 82L, 82R are that axletree housing 51 extends towards rear foreign side in the past, arrive the structure of back axle housing 88 by the below, front side of spray tank 9.Wherein the front and back pull bar 82L in left side extends forwards, backwards via the support portion of the lifting pedal (ス テ ッ プ) 85 in running vehicle body 2 left sides.

Above-mentioned front and back pull bar is undertaken by ball-joint each link of coupled arm., coupled arm 65L, the 65R of front-wheel 3L, 3R make on the leading section of this arm of connecting part side direction 65L, the 65R such as arm of ball-joint 83L, 83R side-prominently, coupled arm 81L, the 81R of trailing wheel 4L, 4R makes under the leading section of this arm of connecting part side direction 81L, the 81R such as arm of ball-joint 84L, 84R side-prominent.Therefore, each front of front and back pull bar 82L, 82R links at the upper face side of coupled arm 65L, 65R, and to this, each rear end side side below coupled arm 81L, 81R links.As mentioned above, turn to the central axis B of the steering shaft 55 of axle housing 54 to be made as following state, the i.e. state with the mode tilt angle alpha towards car body foreign side with respect to its lower end side of plumb line D, equally, the central axis that turns to axle housing 86 to be also configured to built-in steering shaft 87 of trailing wheel 4 is skewed, therefore, front-wheel 3L, 3R side coupled arm 65L, 65R is in low level, trailing wheel 4L, 4L side coupled arm 81L, 81R is in a high position, by the configuration of ball-joint as described above, front and back pull bar 82L, 82R becomes approximate horizontal posture (Figure 18), be conducive to guarantee the high position of minimum floor level, and can easily make the structure of interference of avoiding forming with spray tank 9 and lifting pedal 85 etc. the structure member of running vehicle body 2.The fault that this interference can be caused thus prevents trouble before it happens.

In addition, above-mentioned rotatable parts 62 and the coupled arm 65 of front-wheel 3 sides are integrally formed structures, realize the reduction of productive costs as the identical shape of the integrally formed product of the rotatable parts 80 with trailing wheel 4 sides and coupled arm 81., need to need to be at the base portion (Figure 19) of coupled arm 81 at rotatable parts 62 and the bolt insertion hole 89b of positions coupled arm 65 symmetries (Figure 13 (A)), side's rear wheel-side connecting member 89 for linking the bolt insertion hole 63b of front wheel side connecting member 63, in front-wheel 3 sides, trailing wheel 4 sides, the integrally formed product of rotatable parts and coupled arm are all made same shape, according to rigging position separately, wear processing bolt inserting hole 63b or 89b.In addition also can in advance bolt insertion hole 63b and 89b be processed.In this situation, can reduce the man-hour of components number management.

Front axle housing 51 detours and swings into direction axle center X with respect to running vehicle body 2, but side's back axle housing 88 is filling integratedly with running vehicle body 2.Yet the connection that utilizes ball-joint 83L, 83R, 84L, 84R absorbs the error of left and right.

As mentioned above, in the left side of front axle housing 51, cut apart half 51L of, and on pars intermedia, form the fixing pedestal 51aL that uses of the joint engaging with framework, on right side, cut apart and on half 51R of, form the fixing pedestal 51aR that uses of same joint, these are fixing is that to make front axle housing 51 be the member in the situation with back axle housing 88 common-use sizes with pedestal 51aL, 51aR, is the structure that back axle housing 88 can be assemblied on the upper set installing frame 104 of travel framework 2L, 2R of running vehicle body 2.Namely, front axle housing 51 is common-use size with back axle housing 88, internal structure parts are also general, in the situation that be assemblied in the front side of running vehicle body 2 and drive front-wheel 3, by support metal part 78A, 78B swings the cylindric shaft sleeve part 51A of carries left right median freely, 51B and form front axle housing 51, in the situation that be assemblied in the rear side of running vehicle body 2 and drive trailing wheel 4, with the state reversing forwards, backwards with front axle housing 51, to fix and use pedestal 88aL, 88aR is bonded on the installing frame 104L of running vehicle body 2, 104R is upper and by bolted, make back axle housing 88.At this, fix and as back axle housing 88 use, give symbol with pedestal 88La, 88Ra, but general with the above-mentioned fixing structure with pedestal 51aL, 51aR.

As mentioned above, due to make each general axletree housing front use or after use and change its assembled form and form, therefore can realize the universalization of parts, cost and assembling are reduced effectively man-hour.

In addition, the structure that turns to axle housing 86L, 86R linking with the left and right of back axle housing 88 be with link with above-mentioned front axle housing 51 turn to the same structure of axle housing 54L, 54R.

During state at steering handwheel in directly entering, the above-mentioned coupled arm 81 of the above-mentioned coupled arm 65 of front-wheel 3 sides and trailing wheel 4 sides forms, and is roughly positioned at the projecting plane of each front axle housing 51 and back axle housing 88 when overlooking.When the maintenance of car body is reorganized and outfit etc., with the hoisting crane car body of slinging, be with 90 to be wound on front axle housing 51 or back axle housing 88 on band or slinging of class of rope.In this case, owing to forming as described above, if therefore steering handwheel is placed in straight and then reels to sling and be with 90, become with this and sling, with 90, coupled arm 65 and 81 is remained to the form of straight moving condition, along with hoisting crane is sling, wheel 3,4 becomes free state, even because deadweight is rotated and also can be stoped around steering shaft, front-wheel 3 and trailing wheel 4 can maintain roughly straight moving condition, and the partial load state that can not cause front and rear wheel 3,4 rotations beyond expecting to cause, can carry out upkeep operation.In addition, symbol 91 is wedges of the swing that causes of the deadweight of restriction front axle housing, conventionally pulls down, but in the situation that maintaining, this wedge 91 is squeezed into gap, the swing of restriction front axle housing 51.

In addition, in the above-described embodiment, to having used the first cylindric fitting portion 76 as an example of the first cylindrical shell of the present utility model, having used the situation of the second cylindric fitting portion 51B to be illustrated to an example as the second cylindrical shell of the present utility model in addition, but be not defined for this, for example, also can be that its cross section is polygonal cylindrical shell, in a word, both sides' cylindrical shell be so long as structure that can be mutually chimeric can be arbitrary shape.

Claims (5)

1. a working truck, is characterized in that,

Possess: running vehicle body (2); Be arranged on the below of this running vehicle body (2) and the axletree housing (51,88) of internal axle (50,92); Link with the both ends of this axletree housing (51,88) and possess above-below direction steering shaft (55,87) turn to axle housing (54,86); Possess axletree (66,94) and be entrenched in the above-mentioned lower side of axle housing (54,86) and the end shell (59,93) that turns to axle housing (54,86) to rotate with respect to this of turning to centered by steering shaft (55,87); Be arranged on and turn to the top of axle housing (54,86) and around above-mentioned steering shaft (55,87) axle center, rotate rotatable parts (62,80) freely; And the connecting member (63,89) that links above-mentioned rotatable parts (62,80) and end shell (59,93), outside arranging, be embedded in the annulus (63a, 89a) that turns to axle housing (54,86) on this connecting member (63,89).

2. working truck according to claim 1, is characterized in that,

In axletree housing (51,88), the end of axletree (50,92) arranges and drives finishing bevel gear cuter (56,95), at the upper bearing that turns to axle housing (54,86), support the driven wheel of differential (57,96) meshing with steering shaft (55,87) and this driving finishing bevel gear cuter (56,95), in being closely close to of this bearings portion, annulus (63a, 89a) is set.

3. working truck according to claim 1, is characterized in that,

Possess the coniform portion (54b) more diminishing more gradually to lower diameter turning on axle housing (54), in this coniform portion (54b), annulus (63a) is set.

4. working truck according to claim 2, is characterized in that,

Possess the coniform portion (54b) more diminishing more gradually to lower diameter turning on axle housing (54), in this coniform portion (54b), annulus (63a) is set.

5. according to the working truck described in claim 1～4 any one, it is characterized in that,

To be arranged on annulus (63a) with the track arm (64) of handling piston rod (71) interlock of cylinder mechanism (70).

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