CN203585276U - Transmission device of operation vehicle - Google Patents

Abstract

The utility model provides a transmission device of an operation vehicle. Rotary power from an engine (E) is transmitted to a speed change input shaft (22) in a gear case (21) through a main clutch (23). Speed change devices (26, 27) in the gear case (21) are utilized for performing speed change of the input rotary power and outputting, so that wheels (3, 4) of a moving vehicle (2) are driven. The transmission device of the operation vehicle is characterized in that the speed change input shaft (22) and a PTO shaft (24) are arranged in a coaxial manner and the PTO shaft (24) is made to rotate through a PTO clutch mechanism (48) by utilizing rotation of the speed change input shaft (22). According to the utility model, the small-size and compact transmission structure is obtained. The transmission structure is equipped with the clutch mechanism enabling free stop and the PTO shaft can be arranged in the gear case reasonably.

Description

The transmission device of working truck

Technical field

The utility model relates to the transmission device of the working truck of agricultural tractor, riding supervisor etc., relates in particular to the improvement that possesses PTO shaft drive.

Background technique

In the past, as possessing the transmission device of riding supervisor, an example of the transmission device of the ride-type working truck of the farmland management apparatus for work of liquid planting machine etc. has patent documentation 1.According to this patent documentation 1, as shown in figure 20, the gearbox device a that travels sails the transmission shaft d of Chuan Dong Longitude road c and can link to transmission by forming the row being connected with the clutch b that travels, and makes the structure of input driving dynamics.And, main transformer speed variator e and secondary speed-changing device f etc. are housed in the gearbox device a that travels, to travelling, output shaft g and rear portion PTO axle h export.In this situation, rear portion PTO axle h becomes from the structure of the transmission downstream side output of main transformer speed variator e and secondary speed-changing device f, can realize the speed change of output, is suitable for needing in operation the working machine of variable speed operation.On the other hand, transmission to plant protection pump k is undertaken by PTO axle j, but its structure is for to arrange belt wheel k on above-mentioned transmission shaft d, between the belt wheel m of the PTO of slave end axle j around being linked with n the structure of transmission, on this band n, tension force belt wheel p be set and can bring into play clutch effect.Therefore, utilize PTO axle j can utilize clutch effect at random to stop to the transmission of plant protection pump k, in the situation that rear portion PTO axle h connection working machine carries out, can make it stop, getting rid of the waste of output.

Prior art document

Patent documentation

Patent documentation 1: TOHKEMY 2010-195096 communique

But, the PTO axle construction of the working truck shown in patent documentation 1 is to prepare rear portion PTO axle h and plant protection pump PTO axle j in advance, and be configured to the structure that can make the PTO axle j of plant protection pump at random stop, but the PTO transmission device of simultaneously using as the special operation machine of not operation, but form like this PTO axle of two systems, because a side does not need, become on the contrary waste.In addition, owing to the driven off by shaft structure of the PTO that is configured in rear vehicle, therefore cannot obtaining the drive mechanism that PTO axle is grown as being input to the power branch of speed changer from motor, in the leeway that still has improvement aspect light-duty miniaturization.

Model utility content

Model utility problem to be solved is as follows.

This model utility In view of the foregoing, provides a kind of PTO axle is reasonably configured in gearbox casing, and have both the clutch mechanism stopping arbitrarily, and small-sized, compact drive mechanism.

As follows for solving the method for problem.

Model utility described in scheme 1 is a kind of transmission device of working truck, rotating power from motor is input to the speed change input shaft in gearbox casing via main clutch, utilize gearbox casing internal speed changing device to carry out speed change output to the rotating power of this input, drive the wheel of running vehicle body, it is characterized in that, make and configure coaxially above-mentioned speed change input shaft and PTO axle, and utilize the rotation of speed change input shaft, and by PTO clutch mechanism, make the structure of PTO axle rotation.

By PTO clutch mechanism being arranged on via main clutch, accept between the speed change input shaft and PTO axle of engine power, even if above-mentioned main clutch is connected, PTO axle also can be selected PTO clutch mechanism in break-make mode, and operator can at random select to set drive condition, the non-driven state of PTO axle.

Model utility described in scheme 2, in scheme 1, the front side shaft of making the speed change input shaft that front and back are grown is supported on gearbox casing, PTO axle shorter size is supported on gearbox casing, on PTO axle, form sleeve-like part, and speed change input shaft rear end axle is supported on to the structure of this sleeve-like part.

Thus, by the front side shaft of speed change input shaft that front and back are grown, be supported on gearbox casing, the PTO axle of short size is supported on gearbox casing, thereby an end of speed change input shaft be supported on PTO axle, can omit the shaft supporting structure to gearbox casing.

Model utility described in scheme 3, in scheme 2, PTO clutch mechanism is made the structure that the clutch body that makes on spline part that the rear portion that is supported on sliding freely speed change input shaft forms and internal gear clutch coordinate, depart from, and wherein this internal gear clutch is formed at week in the front end of sleeve-like part of the PTO axle coaxial with speed change input shaft.

Owing to being the structure that axle supports the rearward end of speed change input shaft in each sleeve-like part, therefore on gearbox casing, do not need special supporting structure, can make designs simplification and reduce costs.

Model utility described in scheme 4, in scheme 1, speed change input shaft and the countershaft parallel with this speed change input shaft are set, make by selection and be arranged on the gear teeth wheels between this countershaft and above-mentioned speed change input shaft, form and carry out the speed change gear exported after speed change, and by utilizing the rotating power of speed change gear speed change output variable speed input shaft to drive the structure of front-wheel or trailing wheel.

Therefore, and possess speed change gear independently, the selection of this speed change gear can not affect the rotation of speed change input shaft and PTO axle.

Model utility described in scheme 5, in scheme 4, arranges the first speed change gear and the second speed change gear as speed change gear.

Model utility described in scheme 6, in scheme 1～scheme 5 any one, makes the plant protection pump structure that utilizes PTO axle to drive liquid sowing apparatus.

Make the plant protection pump structure that links liquid sowing apparatus at PTO axle.

The effect of model utility is as follows.

According to the model utility described in scheme 1, even if above-mentioned main clutch is connected, PTO axle also can be selected PTO clutch mechanism in break-make mode, and operator can at random select to set drive condition, the non-driven state of PTO axle, even if therefore also can stop operation under steam device.

Model utility described in scheme 2 is except the effect described in scheme 1, and an end of speed change input shaft is supported on PTO axle, can omit the shaft supporting structure to gearbox casing, therefore can make designs simplification and at an easy rate form.

Model utility described in scheme 3 is except the effect described in scheme 2, make clutch body on spline part that the rear portion that is supported on sliding freely speed change input shaft forms, coordinate, depart from the internal gear clutch forming in week in the front end of the sleeve-like part of PTO axle, therefore, at this sleeve-like part axle, support respectively the rearward end of speed change input shaft, thereby on gearbox casing, do not need special supporting structure, can make designs simplification and reduce costs.

Model utility described in scheme 4 is except the effect described in scheme 1, have nothing to do with a part for the gear that possesses speed change gear on speed change input shaft, the selection of speed change gear can not affect the rotation of speed change input shaft and PTO axle, therefore before and after switching, the speed change of speed change gear can obtain certain rotation, the rotation of operation pusher side does not change, and can maintain workability.

Accompanying drawing explanation

Fig. 1 is the unitary side view that liquid is sowed operating vehicle.

Fig. 2 is the plan view that liquid is sowed operating vehicle.

Fig. 3 is the rear view that liquid is sowed operating vehicle.

Fig. 4 is the plan view that liquid is sowed operating vehicle.

Fig. 5 is the plan view that represents to sow job state.

Fig. 6 is the sectional view of driving mechanism portion.

Fig. 7 is the plan view of driving mechanism portion periphery.

Fig. 8 is the plan view of driving mechanism portion periphery.

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

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

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

Figure 12 (A) is the plan view that represents the non-swing state of front axle housing, and Figure 12 (B) is the plan view that represents swing state.

Figure 13 (A) is the back side sectional view of the near front wheel transmission unit, and Figure 13 (B) is the rear 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 plan view of handling cylinder mechanism.

Figure 16 is the summary rearview that represents the stationary state of the near front wheel side pull-rod and ball-joint.

Figure 17 represents the manipulation of front and back wheels and the plan view of interlock state.

Figure 18 represents the manipulation of front and back wheels and the side view of interlock state.

Figure 19 is the rear sectional view of left rear wheel transmission unit.

Figure 20 is the drive mechanism explanatory drawing that represents an example of prior art.

In figure:

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

Embodiment

Below, with reference to accompanying drawing, the liquid of a mode of execution as working truck of the present utility model being sowed to operating vehicle describes.In addition, have in the situation of pairing left and right structure member, symbol L refers to left side, and symbol R refers to right side.

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

As shown in Figure 1 and Figure 2, at liquid, sow on the running vehicle body 2 of operating vehicle 1 and be provided with pairing left and right front- wheel 3L, 3R and pairing left and right 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 operating vehicle 1, be configured to that minimum ground height H is high, W is large for tyre tread (wheelspan).

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

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

In addition, the mode of surrounding of handling seat 6 to surround is loaded and unloaded liquid medicinal case 9 is 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 front sow cantilever 11C; And be arranged on the left and right sides that central authorities sow the left and right sides of cantilever 11C and sow cantilever 11L, 11R.

And, utilize lifting jar 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 sides sow cantilever 11L, 11R separately outstandingly to the left and right respectively to sow job state (with reference to Fig. 5) and the state folding and unfolding (with reference to Fig. 1～Fig. 4) with two sides along running vehicle body 2.

And the liquid of liquid medicinal case 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 sides is sowed the multiple 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 motor E, to the variable transmission mechanism of each portion transmission variable-speed dynamic, describe.With the output shaft 20 of the coaxial support of crankshaft (not shown) of motor E and gearbox casing 21 side speed change input shafts 22 between main clutch 23 is installed.This main clutch 23 adopts the known structure of multi-plate clutch form, makes the clutch pedal 23a that is disposed 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 main clutch 23 makes the driving mechanism interlock in gearbox casing 21 via speed change input shaft 22, this gearbox casing 21 is structures of the 21f of case portion, 21r before and after engaging, and makes the structure that supports various variable-speed shafts etc. in the bearing wall portion of gearbox casing 21 front and back.

Above-mentioned speed change input shaft 22 rearward extends and is supported in gearbox casing 21 and forms gear axle, and multiple speed change gears are set.Be to support and the PTO axle 24 of speed change input shaft 22 concentrics at the rear wall parts axle of gearbox body 21r, at the hub-like part 24a of front end, bearing be set to support the structure of rear end of above-mentioned speed change input shaft 22.In addition, in the present embodiment, PTO axle 24 is made as and drives aftermentioned plant protection pump 10 special, 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-speed shaft 22, formation is as 3 grades of secondary speed-changing devices 26 of the first speed change gear, and formation can select 2 grades of advance side height and retreating the main transformer speed variator 27 of 1 grade as the second speed change gear.And be following structure: from the power of speed change input shaft 22 via with below the first speed change gear 26(, secondary speed-changing device 26) after speed change level after speed change, below the second speed change gear 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 casing 21 is fixed on speed change input shaft 22 and three pieces of different secondary speed change gear 28a of gear diameter is set, 28b, 28c, and the secondary speed change sliding gear 29 of selecting these secondary speed change gear 28a～28c is set in the first countershaft 25 sides, the large diameter gear 29b making in 2 grades of gears of this sliding gear 29 engages with above-mentioned secondary speed change gear 28b, the structure that small-diameter gear 29c engages with secondary speed change gear 28c, integrally formed with the shaft sleeve part 29d of sliding gear 29 small-diameter gear 29a be rotate be supported on freely on the first countershaft 25 and with the structure of the internal gear 30a engagement of the counter shaft gear 30 always engaging with above-mentioned secondary speed change gear 28a.Due to such formation, therefore by secondary speed change sliding gear 29 is slided, and small-diameter gear 29a is engaged with the internal gear 30a of counter shaft gear 30, thereby obtain secondary speed change the first speed, by 2 grades of large diameter gear 29b in gear are engaged with secondary speed change gear 28b, thereby obtain secondary speed change the second speed, by the small-diameter gear 29c that makes 2 grades of gears, engage with secondary speed change gear 28c, thereby obtain secondary speed change the 3rd speed.

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

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

, at the gapped chimeric shelves intermediate gear 36 that retreats of the front end 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.At main transformer ski-running moving gear 38 chimeric with the spline part of the second countershaft 35 and that slide freely, in front and back, form centered by a high speed with intermediate gear 38a and retreat shelves internal gear 38b, middle internal 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 converting counter shaft gear 39 and the irrelevant to rotation of this speed change input shaft 22 be rotate.On this is just converting counter shaft gear 39, form the low speed counter shaft gear 39a that diameter is different and use at a high speed counter shaft gear 39b.

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 engages with the just conversion driving gear 40 of the second countershaft 35, it is above-mentioned that to retreat shelves intermediate gear 36 identical, be always with the second countershaft 35 retreat the structure that engages with driving gear 41 of shelves.

If make the middle internal gear 38c of low speed of above-mentioned main transformer ski-running moving gear 38 and low speed intermediate gear 37 chimeric, the rotating 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 driving gear 40 of just converting, and to the second countershaft 35, transmits low speed forward power.If the high speed intermediate gear 38a of main transformer ski-running moving gear 38 is engaged with high speed counter shaft gear 39b, 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 driving gear 40 of just converting of converting just, to the second countershaft 35, transmit high speed forward power.

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

The major and minor variable speed drives 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 casing 21, the spline shaft 44a of rear portion side via rear propeller shaft 44r with trailing wheel differential attachment interlock, via rear axle shaft, drive trailing wheel 4L, 4R, the spline shaft 44b of toe lateral drives front-wheel differential attachment 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 speed change lever 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 guiding element 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 disposed 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 is supported on the clutch body 48a of 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 shifter 48b and the structure that makes clutch body 48a coordinate, depart from internal gear clutch 24b.Shifter 48b is and the structure of above-mentioned PTO bar 49 interlocks.The shifter supporting element 48c of fastening shifter 48b is supported on gearbox casing 21, this gearbox casing 21 can reciprocatingly slide abreast with speed change input shaft 22, in the rear end side of rearward giving prominence to from gearbox casing 21 of this shifter supporting element 48c, 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 terminal side 49a rotates to be arranged on freely and form travel side's side (being right travel framework 2R side) of framework 2L, 2R of the pairing left and right of running vehicle body 2 in legend, the handle side 49b of bending is arranged to can operate in swing take this installation base portion side 49a as axle center core, by swinging operation forwards, connect above-mentioned engaging clutch mechanism 48, by the swinging operation at the rear to contrary, cut off above-mentioned engaging clutch 48(Fig. 7 of mechanism).

In the rear portion side of the above-mentioned transmission shaft 44 that travels, and linking freely on the fixing 21m of metal portion with the rear wall handling of gearbox casing 21, brake unit 45 is set.This brake unit 45 is that the braking plate by making many plates contacts 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 main clutch 23, PTO axle 24 is configured in to the rear of gearbox casing 21, by band, the transmission around the belt wheel 12 that hangs over the plant protection pump 10 approaching with sidepiece drives this pump 10 to the belt wheel 31 of the shaft rear end of rearward giving prominence to from the rear wall of gearbox casing 21.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 fixed.

Via main 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 main 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 drive condition, non-driven state.

PTO clutch mechanism 48 makes that clutch body 48a on the spline part that makes to form with the internal gear clutch 24b forming in week in the front end of 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 the rear portion that is supported on speed change input shaft 22 follows moving forward and backward of shifter 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 casing 21, do not need special supporting structure, 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-speed shaft 22, form the first speed change gear and the second speed change gear, that the power of speed change input shaft 22 is via after the speed change level by after the first speed change gear 26 speed changes, via the high low speed of advancing of the second speed change gear 27 or the speed change level that retreats shelves, drive the structure of front-wheel 3 and trailing wheel 4, although form first, two speed change gears, 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 housing 34 of the 23a of the shell that covers above-mentioned main clutch 23 is set.This clutch housing 34 is U shape while being formed as overlooking, base portion 34a, 34a handling are arranged on the antetheca of above-mentioned gearbox casing 21 freely, and forms bearing portion 34b in the wall portion that is formed at front side.Make above and present main 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 crankshaft interlock of above-mentioned motor E in above-mentioned bearing portion 34b support.If form like this, the supporting structure of output shaft 20 and gearbox casing 21 become one, and realize the raising of its precision when assembling main clutch 23.

Above-mentioned gearbox casing 21 is to the installation of running vehicle body 2 as shown in Fig. 7 waits, and travel framework 2L, 2R of the pairing left and right 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 casing 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 mounting point of this gearbox casing 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 13 (B) to describe front wheel drive mechanism and operating mechanism.

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

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

In the central rear of above-mentioned front axle housing 51, form 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 bevel gear 52a of this front-wheel input shaft 52 and the front-wheel differential attachment 53 that is disposed in axletree housing 51 central parts.The front axle 50 extending to the left and right from front-wheel differential attachment 53 is linked by bevel gear 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, bevel gear 56 is arranged on front axle 50 ends, and bevel gear 57 is the driven wheel of differential of this bevel gear 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, the large footpath bevel gear 100 engaging with the small gear of this front-wheel input shaft 52, being formed as can the above-mentioned front-wheel differential attachment 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.Be formed as cutting apart on a side right side intermediate portion that half 51R of can folding and unfolding right side front axle 50R with rear section and differential-speed lock mechanism 101.

In left side, cut apart 102, the bearing of the above-mentioned large footpath bevel gear 100 of half 51L of, cut apart half 51R of carry out flange and engage and use bolt 103 freely to load and unload with right side, direct of travel axis X during joint becomes the left and right center line of front axle housing 51 entirety.Therefore, front axle housing 51 can left and right balance swing around this axis X well.And the parting plane of axletree housing 51, as 102, the bearing of large footpath bevel gear 100, therefore can be guaranteed the intensity of parting plane.

In the left side of above-mentioned front axle housing 51, cut apart half 51L of, on intermediate portion, 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 the member of situation of front axle housing 51 and rear axle shaft housing 88 common-use sizes described later, be therefore the structure that rear axle shaft housing 88 can be arranged on to the upper set installing frame 104 of travel framework 2L, 2R 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 limiter 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 fixed and play the function as limiter with pedestal 51aL, 51aR, therefore do not need special limiter structure.

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

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 lock (デ Off ロ ッ Network) mechanism 101.On the solid of rotation 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 lock state or non-differential lock state.In addition, because the patent part side of cutting apart half 51L of with left side forms differential-speed lock mechanism 101, therefore easily assembling.In addition, solid of rotation 105b can be rotated operation and locked by peripheral operation and via working arm 105d.The direction reinforcing that this working arm 105 is always removed to differential lock by spring.

As mentioned above, by front axle housing 51 being formed as to left and right sides, 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 machining but also easily guarantees above-mentioned precision.

Owing to cutting apart left side 51L configuration input shaft 52, large footpath bevel gear 100, differential attachment 53, left and right axletree 50L, 50R, therefore can engage the confirmation that the spinning movement of input and output shaft is cut apart state before half 51R of and carried out on right side linking.

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 bevel gear 56,57 of steering shaft 55.In addition, end shell 59 axles supportings front wheel spindles 66, these front wheel spindle 66 supports right front-wheels 3, possess the bevel gear 60 of lower end of steering shaft 55 and the driven wheel of differential 61 engaging with this bevel gear 60.In addition, end shell 59 consists of the side face 59b that turns to the bottom embedding part 59a of axle housing 54, links with the outer side surface of this embedding part 59a and surround above-mentioned driven wheel of differential 61 chimeric from outside.

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, the driving mechanism such as end shell 59, built-in bevel gear and front-wheel 3 are arranged to freely rotate around the steering shaft 55 of this inclination.

Shaft sleeve part 54d is formed on the top at the above-mentioned tubular top 54a that turns to axle housing 54, utilizes 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 this annulus 63a is entrenched in the above-mentioned coniform 54b of the portion outside that turns to axle housing 54., 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 steering knuckle 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, strength ratio is higher is chimeric with turning to.Therefore, although concentrate the steering force from manipulation cylinder mechanism that is subject to transmitting via steering knuckle arm 64, but because forming ring-shaped member 63a and be entrenched in, connecting member 63 turns to axle housing 54 outsides, therefore be delivered to the control loads of steering knuckle arm 64 by turning to axle housing 54 to share acceptance, prevent thus the distortion of connecting member 63 or crooked.And by the position configuration of ring-shaped member 63a is turned to being closely close to of the steering shaft 55 of axle housing 54 and the required part that is formed as wall thickness of the bearing portion of bevel gear 57 in support, thereby present the reinforcement structure for bearing 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 the plane of inclination shape that rolls oblique predetermined angular β take the direct of travel F of running vehicle body 2 as benchmark towards the near front wheel 3L.In addition, the steering knuckle arm 64 above that is fixed on this annulus 63a is same with side, the front side 63af of annulus 63a, take direct of travel F as benchmark, towards the near front wheel 3L inclination predetermined angular γ, fixes (Figure 14 (A)).

Need to make in the agricultural operation vehicle that minimum ground 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 leaning structure, crops are the bottom of running vehicle body 2 process swimmingly, not easy damaged crops.

On the other hand, existing steering knuckle 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 ground level H is high, can be to there is the problem of easy breakage for the structure of each portion that end shell is rotated applies large flexural 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 steering knuckle arm 64, near of this height, arrange annulus 63a can be not to for using the connecting member 63 that end shell 59 rotates to apply unwanted flexural stress.In addition, by by turning to axle housing 54 to make make from tubular top 54a downward 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 front of front axle housing 51, arrange the manipulation cylinder mechanism 70 that handles pairing left and right front-wheel 3L, 3R.By pull bar 72L, 72R, the piston rod 71 of this manipulation cylinder mechanism 70 is attached on above-mentioned steering knuckle 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, steering knuckle 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 steering knuckle 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. Steering knuckle arm 64L, 64R utilize pairing left and right ball-joint 74L, 74R rotation to link with pairing left and right pull bar 72L, 72R freely.

Figure 14 (B) represents the mounting structure of installing to annulus 63a of above-mentioned steering knuckle arm 64.At the base portion of steering knuckle arm 64, form longitudinal assembly department 64a, or additional by methods such as welding, by longitudinal bolt 67, horizontal bolt 68, be fixed on the base portion of steering knuckle arm 64.By such formation, without unclamping bolt, just can securely steering knuckle 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 receiving the outer circumferential face of 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 structure be provided with integratedly towards rear, front axle housing 51 sides extend the first cylindric embedding part 76.The inside of the first cylindric embedding part 76 is formed as tubular inner space.In the central authorities of the above-mentioned front axle housing 51 of a side, the symmetrical position that is front side at the cylindric shaft sleeve part 51A of the rear side with respect to the above-mentioned front-wheel input shaft 52 of support, forms chimeric the second cylindric embedding part 51B that is arranged on the first cylindric embedding part 76 on above-mentioned cylinder housing 75.And after above-mentioned the first cylindric embedding part 76 is inserted into the second cylindric embedding part 51B, its linking portion is by coming off and prevent that the fixing pin 77 of the secure component that rotates use from connecting and being fixed as preventing.

As mentioned above, at the central part of front axle housing 51, the second cylindric embedding part 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 metalwork) 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, ear 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 the cylindric shaft sleeve part 51A, the outer shape of the second cylindric embedding part 51B of the front and back side that is formed at respectively front axle housing 51 are 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 piston rod 71 of handling cylinder mechanism 70, to as being connected to hydraulic hose 79L, the 79R of row's working oil across cylinder configuration with the 70a of cylinder body portion that handles cylinder mechanism 70 via the left and right side of the support metal part 78B of front side in left chamber or the right ventricle in the space of left and right.

In addition, as embodied as shown in the Figure 15 of installment state that handles 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 observing from front, 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 ground level.In addition, with regard to this configuration status, even if front axle housing 51 swings around axle center X, both relations also can not change, and with the having that it's too late size independently makes front-wheel corner cut for certain of this swing, can improve manoeuvring performance.

In addition, as shown in figure 15, the surface 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, making while observing from front is the structure of V word.And the elongation 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 jumbo manipulation cylinder., when guaranteeing minimum ground level H in addition, make following structure,, at the outer circumferential face of axletree housing 51 and the outer circumferential 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 holding 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 embedding part 76 of present embodiment, and an example of the second cylindrical shell of the present utility model is corresponding with the second cylindric embedding part 51B of present embodiment.In addition, an example of a pair of support in front and back of the present utility model is corresponding with a pair of support metal parts in front and back (pivot metalwork) 78A, the 78B of present embodiment.

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

Thus, axletree housing 51 entirety 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 the support metal part 78A, the 78B that bear 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, be suitable for Figure 13 (A), Figure 13 (B), Figure 16 construct and further describe the link of pairing left and right steering knuckle arm 64L, 64R and pairing left and right pull bar 72L, 72R.

Figure 16 is for the pull bar 72L that links with the near front wheel 3L side and the summary rearview of the stationary state of ball-joint 74L are 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 steering knuckle arm 64L, 64R used as shown in figure 16, tilt angle alpha and be fixed on the structure of the front end 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, steering knuckle arm 72L, 72R etc.

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

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

In addition, using in the illustrated said structure of Figure 13 (A), Figure 13 (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 pairing left and right front- wheel 3L, 3R, is suitable for substantially similarly for pairing left and right trailing wheel 4L, 4R.As shown in figure 20, in the left and right of the rear axle shaft housing 88 of built-in rear axle shaft 92, install and turn to axle housing 86, with inclination attitude axle, support steering shaft 87 therein.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, with connecting member 89 links this rotatable parts 80 and above-mentioned end shell 93.On connecting member 89, as the connecting member 63 of front-wheel 3, with the structure identical with the connecting member 63 of front-wheel 3 sides and annulus 63a, be formed in the chimeric annulus 89a that turns to axle housing 86 midway.

From the driving force of rear axle shaft 92 and the transmission that utilizes bevel gear mechanism mutually auxiliary via the rear-wheel spindle 94 in steering shaft 87, end shell 93, arrive trailing wheel 4.And, 95,96 groups of the bevel gears between formation rear axle shaft 92 and steering shaft 87,97,98 groups of the bevel gears between steering shaft 87 and rear-wheel spindle 94.

Secondly, based on Figure 17, Figure 18, the serial verb construction of the manipulation that has utilized front-wheel 3 and trailing wheel 4 is described.

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 and form to the inner side of running vehicle body 2.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 form 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 turn left to time, left and right trailing wheel 4L, 4R via front and back pull bar 82L, 82R turn right to, can become the left little turning (solid arrow in Figure 17) of state that four-wheel is handled.Otherwise, when left and right front- wheel 3L, 3R turn to dextrad, left and right trailing wheel 4L, 4R turn left thereupon 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 rear axle shaft housing 88 by the below, front side of liquid medicinal case 9.Wherein the front and back pull bar 82L in left side extends forwards, backwards via the supporting 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 front end of this arm of linking department side direction 65L, the 65R such as the arm of ball-joint 83L, 83R side-prominently, coupled arm 81L, the 81R of trailing wheel 4L, 4R makes under the front end of this arm of linking department side direction 81L, the 81R such as the arm of ball-joint 84L, 84R side-prominent.Therefore, each forward end 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 ground level, and can easily make the structure of avoiding forming with liquid medicinal case 9 and lifting pedal 85 etc. the interference of 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 cost of production as the shape identical with the integrally formed product of coupled arm 81 with the rotatable parts 80 of trailing wheel 4 sides., need to need to be at the base portion of coupled arm 81 (Figure 19) 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 the bolt insertion hole 63b that links 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 rear axle shaft housing 88 is filling integratedly with running vehicle body 2.But utilize the connection of ball-joint 83L, 83R, 84L, 84R to absorb 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 intermediate portion, 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 fixing with pedestal 51aL, 51aR be make front axle housing 51 be with the situation of rear axle shaft housing 88 common-use sizes under member, be the structure that rear axle shaft 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 rear axle shaft housing 88, internal structure parts are also general, in the case of being assemblied in the front side of running vehicle body 2 and driving 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 case of being assemblied in the rear side of running vehicle body 2 and driving 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 bolton, make rear axle shaft housing 88.At this, fixing as rear axle shaft housing 88 use, give symbol with pedestal 88La, 88Ra, but general with the structure of above-mentioned fixing use 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 generalization 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 rear axle shaft 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 wheel 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 is formed as, and is roughly positioned at the projection plane of each front axle housing 51 and rear axle shaft housing 88 when overlooking.When the maintenance of car body is reorganized and outfit etc., with the hoist car body of slinging, be with 90 to be wound on front axle housing 51 or rear axle shaft housing 88 on band or slinging of class of rope.In this case, owing to forming as described above, if therefore steering wheel 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 hoist 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, can not cause the front and rear wheel 3,4 beyond expecting to rotate the partial load state causing, 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 used the first cylindric embedding part 76, other to having used the situation of the second cylindric embedding part 51B to be illustrated as an example of the second cylindrical shell of the present utility model as an example of the first cylindrical shell of the present utility model, 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 as long as structure that can be mutually chimeric can be arbitrary shape.

Claims (6)

1. the transmission device of a working truck, rotating power from motor (E) is input to the speed change input shaft (22) in gearbox casing (21) via main clutch (23), utilize gearbox casing (21) internal speed changing device to carry out speed change output to the rotating power of this input, drive the wheel (3,4) of running vehicle body (2), it is characterized in that

Make and configure coaxially above-mentioned speed change input shaft (22) and PTO axle (24), and utilize the rotation of speed change input shaft (22), and by PTO clutch mechanism (48), make the structure of PTO axle (24) rotation.

2. the transmission device of working truck according to claim 1, is characterized in that,

The front side shaft of making the speed change input shaft (22) that front and back are grown is supported on gearbox casing (21), PTO axle (24) shorter size is supported on gearbox casing (21), at PTO axle (24), above form sleeve-like part (24a), and speed change input shaft (22) rear end axle is supported on to the structure of this sleeve-like part (24a).

3. the transmission device of working truck according to claim 2, is characterized in that,

PTO clutch mechanism (48) is made the structure that the clutch body (48a) that makes on spline part that the rear portion that is supported on sliding freely speed change input shaft (22) forms and internal gear clutch (24b) coordinate, depart from, and wherein this internal gear clutch (24b) is formed at week in the front end of sleeve-like part (24a) of the PTO axle (24) coaxial with speed change input shaft (22).

4. the transmission device of working truck according to claim 1, is characterized in that,

Speed change input shaft (22) and the countershaft (25) parallel with this speed change input shaft (22) are set, make by selection and be arranged on the gear teeth wheels between this countershaft (25) and above-mentioned speed change input shaft (22), form and carry out the speed change gear exported after speed change, and by utilizing the rotating power of speed change gear speed change output variable speed input shaft (22) to drive the structure of front-wheel (3) or trailing wheel (4).

5. the transmission device of working truck according to claim 4, is characterized in that,

As above-mentioned speed change gear, the first speed change gear (26) and the second speed change gear (27) are set.

6. according to the transmission device of the working truck described in claim 1～5 any one, it is characterized in that,

Make the structure of utilizing PTO axle (24) to drive the plant protection pump (10) of liquid sowing apparatus.

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