CN1937910A - Tractor - Google Patents

Abstract

A lift arm supporting body is reduced in weight. A lift arm supporting shaft is installed in the transverse direction, with the axis of the shaft oriented in the left/right direction, on the outside of a transmission case with the lift arm supporting body in between, a left and right pair of lift arms is attached to the lift arm supporting shaft, a lift cylinder is interposed between an intermediate section of each of the lift arms and the lower part of the transmission case to make the lift arms vertically pivotable, and a lubricating oil supply section for supplying a lubricating oil to the lift arm supporting shaft is provided on the lift arm supporting body.

Description

Tractor

Technical field

The present invention relates to be provided with the tractor that is used for to the lubricating oil supply unit of the lift arm fulcrum supplying lubricating oil of rear arm supporting body.

Background technology

In the prior art, a kind of mode as tractor, be provided with pressure-oil tank in the connection of the top of gearbox, between the sidewall of the left and right sides of this pressure-oil tank, be provided with the lift arm fulcrum of axis with the breakthrough status transverse strands towards left and right directions, in the right and left end of this lift arm fulcrum the base end part of the lift arm of pair of right and left is installed, between the bottom of the middle part of each lift arm and gearbox portion, is provided with in the flexible lift cylinder (with reference to patent documentation 1) of above-below direction.

This pressure-oil tank forms the box-shaped of lower opening, be connected in this pressure-oil tank and in the gearbox, on the lift arm fulcrum with the breakthrough status crossbearer between the sidewall of the left and right sides of pressure-oil tank, the lubricating oil that is stored in the gearbox is dispersed, to guarantee the lubricity of this lift arm fulcrum.

In addition, being formed with bolt hole on the circumference of the lower end of pressure-oil tank forms with flange shape, on this bolt hole forms with flange shape, separate certain intervals in a circumferential direction and offer and be formed with bolt hole, utilize bolt pressure-oil tank to be connected in the gearbox portion by each bolt hole.

Yet, in above-mentioned tractor, leading section at lift arm is connected with Work machine, when lift cylinder was extended action, at the leading section of lift arm, Work machine was owing to deadweight produces downward load, middle part at this lift arm, owing to the power effect of lift cylinder elongation action has load upwards, so, with this lift arm as lever, with the leading section of this lift arm as the force, with pars intermedia as fulcrum, and, with base end part as application point, the effect of performance lever principle, thereby, the load that effect upwards promotes on the lift arm fulcrum, i.e. tensile load.

Therefore, the perisporium of the pressure-oil tank of pivotal support lift arm fulcrum is necessary to take to form firm shape to bear this tensile load by heavy wall.

But for the perisporium that makes pressure-oil tank forms heavy wall, particularly the rear wall of pressure-oil tank is partial to the more rear of the pivotal support position of lift arm.

Therefore, when tensile load acts on the lift arm fulcrum, can act on bending moment at the rear portion of pressure-oil tank, in order to form the firm shape of bearing this bending moment, and must on the perisporium of pressure-oil tank, increase wall thickness again, the result has brought the problem of the weight increase of pressure-oil tank.

(patent documentation 1) Japanese kokai publication hei 2-200104 communique

Summary of the invention

(1) in first embodiment of the present invention, outside at gearbox, by the rear arm supporting body transverse strands lift arm fulcrum of axis towards left and right directions arranged, on this lift arm fulcrum, the pair of right and left lift arm is installed, between the bottom of the middle part of each lift arm and gearbox, be provided with the lift cylinder that on above-below direction, to stretch, can utilize this lift cylinder that lift arm is carried out up and down and the action of rotating, on rear arm supporting body, be provided with the lubricating oil supply unit, be used for to lift arm fulcrum supplying lubricating oil.

So, in the outside of gearbox, be provided with the lift arm fulcrum by rear arm supporting body in transverse strands, by being arranged on lubricating oil supply unit on the rear arm supporting body to this lift arm fulcrum supplying lubricating oil, so, can guarantee the rotating property that this lift arm fulcrum is good.

And the wall shape that rear arm supporting body can guarantee to support the part of lift arm fulcrum has enough intensity, its result, because the part that supports beyond the lift arm fulcrum does not need wall, so, can weight reduction.

(2) in second embodiment of the present invention, rear arm supporting body has installation sheet that is used for installing and the pair of right and left support chip that erects support lift arm fulcrum from this installation sheet on gearbox, be formed with on this installation sheet at the place ahead of pair of right and left support chip and the installing hole between two support chips of left and right sides, simultaneously, the installing hole between two support chips is configured near the lift arm fulcrum that is supported on by axle on the support chip.

So, there is no need on the installation sheet beyond the axle support chip, to form wall, the installing hole that forms between the pair of right and left axle support chip that forms on this installation sheet is because its position is near the lift arm fulcrum that is supported on the support chip, therefore, have under the situation of tensile load even on this lift arm fulcrum, act on, rear portion at installation sheet does not have the bending moment effect yet, therefore, can make the thickness attenuation of installation sheet, thereby, can make weight lighter.

And, can balancedly form installing hole on the installation sheet on the position all around, thereby, can guarantee the installation strength of installation sheet.

(3) in the 3rd embodiment of the present invention, be positioned between pair of right and left axle support chip, and on the part of the installation sheet under the lift arm fulcrum, be formed with up the recess with the rear opening, in this recess, be formed with two installing holes between support chip.

So, between pair of right and left axle support chip, and above being formed with on the part of the installation sheet of position under the lift arm fulcrum and the recess of rear opening, in this recess, be formed with two installing holes between support chip, can make at the installing hole that forms between support chip near the lift arm fulcrum that is supported on by axle on the support chip, even effect has tensile load under situation on this lift arm fulcrum, can bending moment not arranged in the effect of the rear portion of installation sheet yet.

And, can form installing hole from the top at installation sheet fully, thereby, processing is more prone to.

Have again, can use a kind of instrument to carry out the fitting operation of installation sheet, make the fitting operation of installation sheet oversimplify.

In addition, rear arm supporting body can be shaped by casting mould, as long as this mould is divided into two parts up and down, it need not core rod, and installation sheet does not extend back, thereby, can make with cheapness.

Description of drawings

Fig. 1 relates to the end view of tractor of the present invention.

Fig. 2 is arranged on the clutch portion on this tractor and the end view of gearbox portion.

Fig. 3 is the plane of this clutch portion and gearbox portion.

Fig. 4 is the side cross-sectional view of this clutch portion of explanation and gearbox portion.

Fig. 5 is the biopsy cavity marker devices rearview of this gearbox portion.

Fig. 6 is the side cross-sectional view of this clutch portion of explanation.

Fig. 7 is the side cross-sectional view that explanation is arranged on the main speed changing portion in the above-mentioned gearbox portion.

Fig. 8 is the rearview of this main speed changing portion.

Fig. 9 is arranged on the side cross-sectional view of the secondary speed changing portion in the above-mentioned gearbox portion.

Figure 10 is the cross sectional illustration figure that amplify at the back side on the top of this pair speed changing portion.

Figure 11 is arranged on the box of tricks in the above-mentioned gearbox portion and the side cross-sectional view of PTO speed changing portion.

Figure 12 is the cross-sectional back side view of this box of tricks.

Figure 13 is arranged on the side view in partial cross-section of the rear arm supporting body in the gearbox portion.

Figure 14 is the plane of this rear arm supporting body.

Figure 15 is the biopsy cavity marker devices rearview of this rear arm supporting body.

Figure 16 is arranged on the cross-sectional plan view of the oil pressure passage in the above-mentioned gearbox portion.

Figure 17 is the central portion side cross-sectional view of this oil pressure passage.

Figure 18 is the left side side cross-sectional view of this oil pressure passage.

Figure 19 is the plane as the rear arm supporting body of another embodiment.

Figure 20 is the biopsy cavity marker devices rearview of this rear arm supporting body.

Figure 21 is the amplification side cross-sectional view as the branch location location division of another embodiment.

Embodiment

As shown in Figure 1, A is a tractor of the present invention, this tractor organism frame 1 is provided with prime mover portion (prime mover) 2, in this prime mover portion, be connected and be provided with gearbox portion (transmission part) 4 by clutch portion (clutchpart) 3, in this gearbox portion 4, dispose Drive Section (driving part) 5, and the PTO speed changing portion 6 that has been connected is is freely loaded and unloaded at the rear portion in this gearbox portion 4, below above-mentioned organism frame 1, by the front bearing box (not shown) pair of right and left front vehicle wheel 7 that has been connected, 7, on the other hand, in above-mentioned gearbox portion 4 by rear axle casing 8,8 (with reference to Figure 12) and the pair of right and left rear wheel 9 that has been connected, 9.The 10th, preceding protective frame (guard frame), the 11st, back protective frame, the 12nd, the upper connecting rod (top link) that Work machines such as connection rotary tillage device are used, the 13rd, connect the lower link that Work machine is used, the 14th, the brace of Work machines such as connection trailer.

Below, the structure of above-mentioned prime mover portion 2, clutch portion 3, gearbox portion 4, Drive Section 5 and PTO speed changing portion 6 is described particularly successively.

(prime mover portion 2)

As shown in Figure 1, prime mover portion 2 comprises: the engine 15 of lift-launch on organism frame 1 etc., this engine 15 opens and closes and is covered by hood 16 freely.

(clutch portion 3)

As Fig. 2～Fig. 4 and shown in Figure 6, for clutch portion 3, rotation is supported with outside double drive axis body 18 in front and back are upwardly extending freely in clutch housing 17, and outside double drive axis body 18 constitutes by rotating freely the chimeric tubular outside driving shaft 20 in ground at the inboard driving shaft 19 of fore-and-aft direction extension with in the outside of this inboard driving shaft 19 in this.

Then, the base end part (leading section) of one side's inboard driving shaft 19, be connected by moving with clutch 21 and above-mentioned engine 15, simultaneously, the top ends of this inboard driving shaft 19 (rearward end), be connected with mobile system transmission mechanism 51 as described below, and, the base end part (leading section) of the opposing party's outside driving shaft 20, be connected with clutch 22 and above-mentioned engine 15 by PTO, simultaneously, the top ends of this outside driving shaft 20 (rearward end) is connected with PTO system transmission mechanism 52 as described below.

At this, back edge portion at clutch housing 17, can load and unload the front edge portion of the main-gear box 53 that is connected with gearbox portion 4 as described below freely, outside double drive axis body 18 in above-mentioned, on the bearing 24 on its top ends pivotal support front portion in being arranged at clutch housing 17, on the other hand, thereafter on the bearing 25 of the front portion of end pivotal support in being arranged at main-gear box 53.

And, in the inner periphery portion of clutch housing 17 rear ends, be formed with the rear wall 27 that has peristome 26 in the centre, upwardly extending tubular supporter 28 passes peristome 26 and is installed on this rear wall 27 in front and back, utilizes this tubular supporter 28 to support the outer peripheral face of the middle part of above-mentioned interior outside double drive axis body 18.

Then, tubular supporter 28, its anterior 28a that is positioned at clutch housing 17 forms the undergauge shape, on the other hand, its rear portion 28b that is positioned at main-gear box 53 forms the hole enlargement shape, is formed with to install with bead sheet 28c on the outer peripheral face of this rear portion 28b, and this installation contacts with the back of the rear wall 27 of clutch housing 17 from behind with bead sheet 28c, simultaneously, install with bolt 29 by installing.

(inboard driving shaft 19)

Inboard driving shaft 19 is cut apart forms that drive axle segments 30 is cut apart in the front portion and drive axle segments 31 is cut apart at the rear portion, simultaneously, two division driving shaft parts 30,31 are connected in the side drive axle 20 each other outside, the front portion is cut apart drive axle segments 30 and rear portion and is cut apart the split position (position is connected) of drive axle segments 31 and be positioned near the connecting portion of clutch housing 17 and main-gear box 53, that is, be configured in the rear portion 28b of tubular supporter 28.

And the front portion is cut apart the top ends of drive axle segments 30 and base end part sleeve chimeric (spigot fitting engagement) that drive axle segments 31 is cut apart at the rear portion and loading and unloading and is connected freely.

Promptly, forwardly on the top end face of division driving shaft part 30, the outstanding backward prominent section of the chimeric usefulness 30a that is provided with, on the other hand, cut apart at the rear portion on the cardinal extremity face of drive axle segments 31 and be formed with the chimeric recess 31a that uses of base end side, with recess 31a middle sleeve is chimeric the prominent section of an above-mentioned chimeric usefulness 30a arranged in that this base end side is chimeric, simultaneously, make the tubular connector 32 of axis, with the spline 30b that forms on the top ends outer peripheral face of division driving shaft part 30 forwardly towards fore-and-aft direction, and cut apart the spline 31b that forms on the base end part outer peripheral face of drive axle segments 31 to carry out spline (spline) chimeric at the rear portion.

(outside driving shaft 20)

With regard to outside driving shaft 20, its anterior 20a forms less diameter along the outer peripheral face of inboard driving shaft 19, its rear portion 20b forms bigger diameter along the outer peripheral face of above-mentioned tubular connector 32, is provided with bearing 33,34 between the inner peripheral surface of the rear portion 28b of the outer peripheral face of this rear portion 20b and tubular supporter 28.

And, the top ends of outside driving shaft 20, the setting that extends back from the rear end of tubular supporter 28 forms one with PTO driven wheel 20c on the outer peripheral face.The 35th, PTO driven wheel spring bearing.

So, inboard driving shaft 19 cut apart form that drive axle segments 30 is cut apart in the front portion and drive axle segments 31 is cut apart at the rear portion, and make two division driving shaft parts 30,31 are connected in the side drive axle 20 mutually outside, thus, with being extended from the top ends of outside driving shaft, the top ends of inboard driving shaft is arranged to back location, shaft coupling by tubular, under the state that the base end part with the power shaft of PTO system cooperatively interacts, the prior art that is connected on same axis is compared, clutch housing 17 is connected on fore-and-aft direction with main-gear box 53, even in this clutch housing 17 and main-gear box 53 interpolations are connected with, under the situation of outside double drive axis body 18, also can eliminate main-gear box 53 and become big unfavorable condition at fore-and-aft direction.

And with under clutch housing 17 and the situation that main-gear box 53 is connected as a whole, its assembly operation and removing connects with the operation of keeping in repair etc. and all becomes easy.

In addition, because being divided into the front portion, inboard driving shaft 19 cuts apart the position that drive axle segments 31 is cut apart at drive axle segments 30 and rear portion, be positioned near the connecting portion of clutch housing 17 and main-gear box 53, so, can make main-gear box 53 reduced in size on fore-and-aft direction, thereby make whole machine body tightr, simultaneously, can also make the module units of main-gear box 53 reduced in size on fore-and-aft direction, reduce the logistics cost of module units, as a result, can be once from the outside order department send into a plurality of unit.

At this moment, because the prominent section of the chimeric usefulness 30a of the top ends of division driving shaft part 30 formation forwardly, chimeric and the loading and unloading of sleeve are connected chimeric with among the recess 31a in cut apart the base end side that forms on the base end part of drive axle segments 31 at the rear portion freely, so the front portion of cutting apart formation is cut apart drive axle segments 30 and rear portion and is cut apart drive axle segments 31 and can and be connected with good precision assembling.

In addition, on the outer peripheral face of the outer peripheral face of whole outside driving shaft 20 and tubular supporter 28, can before and after be free to slide ground chimeric have move with tubular action body 36, move rear portion at this with tubular action body 36, be connected and move the base end part of using clutch actuating rod 37, on the other hand, this front edge portion that moves with tubular action body 36 is provided with clutch effect sheet 36a, and this clutch effect sheet 36a is subjected to relative and approaching configuration of swing arm 21a with clutch 21 with moving.The 38th, the bar fulcrum.

So, when moving with clutch actuating rod 37 rotating operations, move with tubular and move body 36 to front slide, clutch effect sheet 36a pushes and is subjected to swing arm 21a, makes this rotated by swing arm 21a, thereby, cut off the power that moves with clutch 21.

In addition, on the outer peripheral face that moves with tubular action body 36, can before and after be free to slide the chimeric PTO of having in ground with tubular action body 39, at the rear portion of this PTO with tubular action body 39, the PTO that the is connected base end part of clutch actuating rod 40, on the other hand, in the front edge portion of this PTO with tubular action body 39, be provided with clutch effect sheet 39a, this clutch effect sheet 39a and PTO are subjected to swing arm 22a relative and closely connect setting with clutch.The 41st, the bar fulcrum.

So, when PTO was rotated operation with clutch actuating rod 40, to front slide, clutch effect sheet 39a pushed and is subjected to swing arm 22a PTO, makes this rotated by swing arm 22a with tubular action body 39, thereby, cut off the power of PTO with clutch 22.

(gearbox portion 4)

As Fig. 2～shown in Figure 4, with regard to gearbox portion 4, on fore-and-aft direction, extend to form in the gearbox portion 45 into tubular, by in turn being provided with main speed-changing mechanism 46, secondary gear 47 and box of tricks 48 behind the forward direction, form the mobile system transmission mechanism 51 of main transformer speed and secondary speed change, in addition, between above-mentioned outside driving shaft 20 and PTO speed changing portion 6 as described below, be provided with PTO system transmission mechanism 52.

Then, gearbox portion 45 is divided into three parts, formation is built-in with the main-gear box 53 of main speed-changing mechanism, be built-in with the auxiliary transmission 54 of secondary gear 47, and the differential box 55 that is built-in with box of tricks 48, in the back edge portion of above-mentioned clutch housing 17, by connecting bolt 56a, the edge part that can freely connect main-gear box 53 front ends with loading and unloading, on the edge part of these main-gear box 53 rear ends, by connecting bolt 56b, the edge part that can freely connect auxiliary transmission 54 front ends with loading and unloading, on the edge part of these auxiliary transmission 54 rear ends,, can freely connect the edge part of differential box 55 front ends by connecting bolt 56c with loading and unloading.

Below, the structure of each several parts such as above-mentioned main-gear box 53, main speed-changing mechanism 46, auxiliary transmission 54, secondary gear 47, differential box 55 and box of tricks 48 is described successively.

(main-gear box 53)

As shown in Figure 7 and Figure 8, main-gear box 53, form upwardly extending tubular in front and back, forwardly be formed with inner support wall 57 on the inner peripheral surface, simultaneously, on the side up and down of rear portion inner peripheral surface, be formed with wall supporting seat 49 respectively to inner process, 49,49,49, at this wall supporting seat 49,49,49,49 back, by connecting bolt 56d, 56d, 56d, 56d is equipped with a supporting walls organizator 50 with freely loading and unloading, without this supporting walls organizator 50, on the front end face of auxiliary transmission 54, by connecting bolt 56b, be connected with the rear end face of main-gear box 53 with freely loading and unloading, make them carry out the face contact.56e is that the location is with prominent section.

At this, axle supporting walls organizator 50, shape along the rearward end inner peripheral surface of main-gear box 53 forms outer peripheral edges portion, and ninor feature becomes slightly for the inside of the rear end inner periphery portion that is configured in this main-gear box 53, and the front end face of auxiliary transmission 54 is contacted with the rear end face generating plane of main-gear box 53.

Between inner support wall 57 and axle supporting walls organizator 50, be provided with main speed-changing mechanism 46, carry out multistage (being Pyatyi in the present embodiment) advance variable speed operation and retreat variable speed operation by main speed-changing mechanism 46.

So, owing in the inner periphery portion of the rearward end of main-gear box 53, a supporting walls organizator 50 can be installed with freely loading and unloading, so, when assembling gearbox portion 45, in advance secondary gear 47 as described below is assembled in the auxiliary transmission 54, and box of tricks as described below 48 is assembled in the differential box 55, in addition, via axle supporting walls organizator 50 main speed-changing mechanism 46 is assembled in the main-gear box 53, subsequently, the front end face of auxiliary transmission 54, be connected and the contact of formation face without axle supporting walls organizator 50 and with the rear end face of main-gear box 53, thus, gearbox portion 45 can be assembled into simple and reliablely, the assembling operation of this gearbox portion 45 can be carried out with good efficiency.

At this moment, owing to be easy to guarantee sealing property between auxiliary transmission 54 and main-gear box 53 end faces, so, also just can be easy to prevent leakage of oil.

(main speed-changing mechanism 46)

As shown in Fig. 7 and Figure 10, for main speed-changing mechanism 46, via above-mentioned bearing 25, support the rear portion in the centre of inner support wall 57 and cutting apart the top ends of drive axle segments 31 (rearward end), cut apart the integrally formed the 5th fast gear 31c on the leading section outer peripheral face of drive axle segments 31 at the rear portion at the rear that is positioned at this bearing 25, and cut apart at this rear portion and form the chimeric recess 31d that uses of tip side on the rear end face of drive axle segments 31, in the chimeric usefulness of this tip side recess 31d, rotate chimeric freely the prominent section of the outstanding forward chimeric usefulness that forms of cardinal extremity face (front end face) 58a around its axis from upwardly extending main transformer speed main shaft 58 in front and back, on the other hand, via bearing 59 top ends (rearward end) of this main transformer speed main shaft 58 is rotated around its axis and be supported in a central portion of supporting walls organizator 50 freely.

And, on main transformer speed main shaft 58, from the base end part side direction the top ends side successively on fore-and-aft direction devices spaced apart the four the three the two the first fast gears 60,61,62,63 are installed freely and retreat change gear 64 coaxially and around the outer peripheral face rotation of main transformer speed main shaft 58.

In addition, on main transformer speed main shaft 58, the 3rd speed change body 65 that is disposed between the 5th fast gear 31c and the fourth speed gear 60 is installed, be disposed at the second speed change body 66 between the three-speed gear 61 and the second fast gear 62, and be disposed at the first fast gear 63 and retreat the first speed change body 67 between the change gear 64.

Here, each speed change body 65,66,67 has and is connected in the axle side of main transformer speed main shaft 58 be connected sheet 65a, 66a, 67a, be connected in the front and back gear side of each gear of front and back adjacency be connected sheet 65b, 65c, 66b, 66c, 67b, 67c, and be connected between sheet 65b, 65c, 66b, 66c, 67b, the 67c at axis direction be slidingly connected sheet 65d, 66d, the 67d of spline fitted sliding freely in be connected sheet 65a, 66a, 67a and each gear side of each side.

And, respectively be slidingly connected sheet 65d, 66d, 67d can slide to being positioned at be connected neutral position on sheet 65a, 66a, the 67a of each side, slip is connected between sheet 65b, 66b, the 67b and both the place ahead slip shift position of being connected in be connected sheet 65a, 66a, 67a and front gear side of each side, and slides and be connected that sheet 65a, 66a, 67a and backgear side are connected between sheet 65c, 66c, the 67c and some in both the rear slip shift position of being connected in each side.

In addition, between inner support wall 57 and above-mentioned axle supporting walls organizator 50, be supported on front and back upwardly extending main transformer speed countershaft 70 via front and rear part bearing 68,69, the one or two three- speed gear body 71,72,73 is installed in coaxial and rotation freely on the outer peripheral face of this main transformer speed countershaft 70.

And, integrally formed front gear 71a and back gear 71b on the first fast gear mass 71, respectively with the 5th fast gear 31c and second fast gear 62 engagements, in addition, integrally formed front gear 72a and back gear 72b on the second fast gear mass 72, respectively with the three-speed gear 61 and second fast gear 62 engagements, in addition, integrally formed front gear 73a is engaged in the first fast gear 63 on three-speed gear body 73, on the other hand, integrally formed back gear 73b props up in the counter gear 74 of axle supporting walls organizator 50 and is engaged in via axle and retreats change gear 64 on this three-speed gear body 73.The 75th, the counter gear fulcrum, 76 are arranged on the axle supporter in the main-gear box 53.

Have again, as Fig. 4, Fig. 5, Fig. 7～shown in Figure 10, between inner support wall 57 and above-mentioned axle supporting walls organizator 50, position directly over above-mentioned main transformer speed main shaft 58, the upwardly extending slide mass fulcrum 80 in front and back has been set up in front and back with being free to slide, simultaneously, in the right side of above-mentioned slide mass fulcrum 80 location, parallel shelf be provided with as can before and after the lever universal driving shaft 81 that is free to slide at the upwardly extending universal driving shaft in front and back, the top ends of the outstanding joint fastener 82 in side is left engaged with the sheet 83 that is engaged that is arranged on slide mass fulcrum 80 front portions, on the other hand, the rearward end of the lever universal driving shaft 81 in extending to auxiliary transmission 54 is provided with effect and bears sheet 84, bears in this effect and is provided with lever-linked mechanism 300 between sheet 84 and the main shift lever 85.

Wherein, for convenience's sake, when secondary gear 47 is described below, the structure of main shift lever 85 and lever-linked mechanism 300 is described.

In addition, as shown in figure 10, in the middle part of slide mass fulcrum 80, has side peristome 90, with when slip restriction body 91 that rear view forms C word shape matches, also make slip effect sheet 92 outstanding and to radial direction by the side peristome 90 from slide mass fulcrum 80.

And, on slide mass fulcrum 80, from after first, second and the 3rd slide mass 95,94,93 are installed forward successively, they can be free to slide on axis direction, simultaneously, the 3rd slide mass 93 is configured in the place ahead of the restriction body 91 that slides, and first, second slide mass 95,94 is configured in the rear of the restriction body 91 that slides.

Have again, each slide mass 95,94,93 has and can be free to slide ground chimeric boss portion 95a, 94a, 93a on the slide mass fulcrum 80, dial retaining fork (shift fork) 95b, 94b, 93b and bear sheet 95c, 94c and 93c from each boss portion 95a, 94a, 93a to the slip effect that the restriction body 91 that slides extends to form from what each boss portion 95a, 94a, 93a extended to form to the left and right.

Then, each group of first, second, third slide mass 95,94,93 retaining fork 95b, 94b, 93b, be slidingly connected sheet 67d, 66d, the 65d with above-mentioned first, second, third speed change body 67,66,65 is connected respectively.

In addition, first, second, the 3rd slide mass 95,94, sheet 95c is born in each slip effect of 93,94c, 93c, by slide mass fulcrum 80 is rotated on the direction that the slip effect sheet 92 and the restriction body 91 that slides are being expected around the axis rotation, thereby make a required slip effect bear sheet and slip effect sheet 92 tablings, this slip effect sheet 92 is linked slide and carry out sliding action in the front and back of slide mass fulcrum 80, and make the outstanding margining tablet 91a that is provided with on the restriction body 91 that slides, at least one side of 91b is engaged in other two slip effects and bears sheet, and two slip effects are born sheet and can be limited the sliding action that links and slide in the front and back of slide mass fulcrum 80.The 96th, be used for moving on the axis direction of limit slippage restriction body 91 and on the 54c of the top of auxiliary transmission 54 vertically disposed restriction with prominent section.

Main speed-changing mechanism 46 constitutes as mentioned above, the following describes the variable speed operation (first variable speed operation～the 5th variable speed operation and retreat handover operation) of related main speed-changing mechanism 46.

(first variable speed operation)

Operation rotates backward under the state that main shift lever 85 approximate vertical are erected, sheet 84 → lever universal driving shaft 81 → joint fastener 82 → be engaged sheet 83 → slide mass fulcrum 80 is born in the effect sheet 85a → effect that its rotating operation power is delivered to form on the bottom of main shift lever 85, makes this slide mass fulcrum 80 to front slide.

So, the sliding force forward of slide mass fulcrum 80 is delivered to the slip effect of slip effect sheet 92 → the first slide masses 95 and bears sheet 95c → boss portion 95a → group retaining fork 95b, being connected slides into the place ahead slip shift position in the sheet 67d that is slidingly connected of the first speed change body 67 of this group retaining fork 95b from the neutral position, axle side sheet 67a and the front gear side sheet 67b that is connected that is connected becomes the state that is connected.

Its result, be delivered to the power of inboard driving shaft 19 from engine 15, be delivered to the front portion and cut apart drive axle segments 30 → rear portion and cut apart the front gear side of fast gear 63 → the first speed change bodies 67 of front gear 73a → first of the front gear 71a of the fast gear 31c of drive axle segments 31 → 5th → first stud gear body 71 → main transformer speed countershaft 70 → the 3rd change-speed gearing body 73 sheet 67b → sheet 67d → axle side that the is slidingly connected fast main shaft 58 of sheet 67a → main transformer that is connected that is connected, become first speed change.

At this moment, slip effect sheet 92 is engaged in the slip effect of first slide mass 95 and bears sheet 95c, and sheet 94c, 93c are born in the margining tablet 91a of restriction body 91 that slides, the slip effect that 91b is engaged in the two or three slide mass 94,93, and the action of two slide masses 94,93 is restricted.

(second variable speed operation)

The rotating operation main shift lever 85 to the right, making the effect sheet 85a that forms on the bottom of main shift lever 85 is that fulcrum rotates to the left with swing support chip 87, make the effect of being delivered to of its rotatory force bear sheet 84 → lever universal driving shaft 81 → joint fastener 82 → be engaged sheet 83 → slide mass fulcrum 80, make this slide mass fulcrum 80, in the rearview of Figure 10, clockwise rotate, and also clockwise rotate via slip effect sheet 92 slip restriction bodies 91.

Then, further the rotating operation main shift lever 85 of rotating operation to the right forward slides backward slide mass fulcrum 80.

So, the sliding force backward of slide mass fulcrum 80 is delivered to the slip effect of slip effect sheet 92 → the second slide masses 94 and bears sheet 94c → boss portion 94a → group retaining fork 94b, make the sheet 66d that is slidingly connected that is connected in the second speed change body 66 of this group retaining fork 94b slide into rear slip shift position from the neutral position, axle side sheet 66a and the backgear side sheet 66c that is connected that is connected becomes the state that is connected.

Its result, be delivered to the power of inboard driving shaft 19 from engine 15, be passed to the front portion and cut apart drive axle segments 30 → rear portion and cut apart the backgear side of fast gear 62 → the second speed change bodies 66 of back gear 72b → second of the front gear 71a of the fast gear 31c of drive axle segments 31 → 5th → first fast gear mass 71 → main transformer speed countershaft 70 → the second fast gear masses 72 sheet 66c → sheet 66d → axle side that the is slidingly connected fast main shaft 58 of sheet 66a → main transformer that is connected that is connected, become second speed change.

At this moment, slip effect sheet 92 is engaged in the slip effect of second slide mass 94 and bears sheet 94c, and the margining tablet 91b of the restriction body 91 that slides is engaged in the slip effect of the one or three slide mass 95,93 and bears sheet 95c, 93c, and the action of two slide masses 95,93 is restricted.

(the 3rd variable speed operation)

The rotating operation and the operation main shift lever 85 that rotates backward make slide mass fulcrum 80 to front slide to the right.

So, the sliding force forward of slide mass fulcrum 80 is delivered to the slip effect of slip effect sheet 92 → the second slide masses 94 and bears sheet 94c → boss portion 94a → group retaining fork 94b, make the sheet 66d that is slidingly connected that is connected in the second speed change body 66 of this group retaining fork 94b slide into the place ahead slip shift position from the neutral position, axle side sheet 66a and the front gear side sheet 66b that is connected that is connected becomes the state that is connected.

The result, be delivered to the power of inboard driving shaft 19 from engine 15, be delivered to the front portion and cut apart drive axle segments 30 → rear portion and cut apart the front gear side of front gear 72a → three-speed gear 61 → the second speed change bodies 66 of the front gear 71a of the fast gear 31c of drive axle segments 31 → 5th → first fast gear mass 71 → main transformer speed countershaft 70 → the second fast gear masses 72 sheet 66b → sheet 66d → axle side that the is slidingly connected fast main shaft 58 of sheet 66a → main transformer that is connected that is connected, become the 3rd speed change.

At this moment, slip effect sheet 92 is engaged in the slip effect of second slide mass 94 and bears sheet 94c, and the margining tablet 91b of the restriction body 91 that slides is engaged in the slip effect of the one or three slide mass 95,93 and bears sheet 95c, 93c, and the action of two slide masses 95,93 is restricted.

(the 4th variable speed operation)

To left rotating operation main shift lever 85, with swing support chip 87 is that fulcrum rotates the effect sheet 85a that forms to the right on the bottom of main shift lever 85, sheet 84 → lever universal driving shaft 81 → joint fastener 82 → be engaged sheet 83 → slide mass fulcrum 80 is born in the effect of being delivered to of its rotatory force, make this slide mass fulcrum 80 in the rearview of Figure 10, rotate counterclockwise, and the restriction body 91 that slides is also rotated counterclockwise via slip effect sheet 92.

Then, further the rotating operation main shift lever 85 of rotating operation to the right forward slides backward slide mass fulcrum 80.

So, the sliding force backward of slide mass fulcrum 80 is delivered to the slip effect of slip effect sheet 92 → the 3rd slide masses 93 and bears sheet 93c → boss portion 93a → group retaining fork 93b, make the sheet 65d that is slidingly connected that is connected in the 3rd speed change body 65 of this group retaining fork 93b slide into rear slip shift position from the neutral position, axle side sheet 65a and the backgear side sheet 65c that is connected that is connected becomes the state that is connected.

Its result, be delivered to the power of inboard driving shaft 19 from engine 15, be delivered to the front portion and cut apart drive axle segments 30 → rear portion and cut apart the backgear side of back gear 71b → fourth speed gear 60 → the 3rd speed change body 65 of the fast gear 31c of the drive axle segments 31 → 5th → three-speed gear body 71 sheet 65c → sheet 65d → axle side that the is slidingly connected sheet 65a → main transformer speed main shaft 58 that is connected that is connected, become the 4th speed change.

At this moment, slip effect sheet 92 is engaged in the slip effect of the 3rd slide mass 93 and bears sheet 93c, and the margining tablet 91a of the restriction body 91 that slides is incorporated into the slip effect of the one the second slide masses 95,94 and bears sheet 95c, 94c, and the action of two slide masses 95,94 is restricted.

(the 5th variable speed operation)

The rotating operation and the operation main shift lever 85 that rotates backward make slide mass fulcrum 80 to front slide to the left.

So, the sliding force forward of slide mass fulcrum 80 is delivered to the slip effect of slip effect sheet 92 → the first slide masses 95 and bears sheet 95c → boss portion 95a → group retaining fork 95b, make the sheet 65d that is slidingly connected that is connected in the 3rd speed change body 65 of this group retaining fork 95b slide into the place ahead slip shift position from the neutral position, axle side sheet 65a and the front gear side sheet 65b that is connected that is connected becomes the state that is connected.

The result, be delivered to the power of inboard driving shaft 19 from engine 15, be delivered to the front portion and cut apart drive axle segments 30 → rear portion and cut apart the front gear side of the fast gear 31c of the drive axle segments 31 → 5th → three-speed gear body 65 sheet 65b → sheet 65d → axle side that the is slidingly connected sheet 65a → main transformer speed main shaft 58 that is connected that is connected, become the 5th speed change.

At this moment, slip effect sheet 92 is engaged in the slip effect of the 3rd slide mass 93 and bears sheet 93c, and the margining tablet 91a of the restriction body 91 that slides is engaged in the slip effect of the one the second slide masses 95,94 and bears sheet 95c, 94c, and the action of two slide masses 95,94 is restricted.

(retreating variable speed operation)

Under the state that generally perpendicularly erects, operate main shift lever 85 forward, sheet 84 → lever universal driving shaft 81 → joint fastener 82 → be engaged sheet 83 → slide mass fulcrum 80 is born in the effect sheet 85a → effect that its rotating operation power is delivered to form on the bottom of main shift lever 85, and this slide mass fulcrum 80 is slided backward.

So, the power of sliding backward of slide mass fulcrum 80 is delivered to the slip effect of slip effect sheet 92 → the first slide masses 95 and bears sheet 95c → boss portion 95a → group retaining fork 95b, make the sheet 65d that is slidingly connected that is connected in the 3rd speed change body 65 of this group retaining fork 95b slide into rear slip shift position from the neutral position, axle side sheet 67a and the backgear side sheet 67c that is connected that is connected becomes the state that is connected.

Its result, be delivered to the power of inboard driving shaft 19 from engine 15, being delivered to the front portion cuts apart drive axle segments 30 → rear portion and cuts apart the backgear side of the back gear 73b → counter gear 74 of the front gear 71a of the fast gear 31c of drive axle segments 31 → 5th → first fast gear mass 71 → main transformer speed countershaft 70 → the three-speed gear bodies 73 → retreat change gear 64 → the first speed change bodies 67 sheet 67c → sheet 67d → axle side that the is slidingly connected fast main shaft 58 of sheet 67a → main transformer that is connected that is connected, this main transformer speed main shaft 58 reverses, and becomes to retreat switching.

At this moment, slip effect sheet 92 is incorporated into the slip effect of first slide mass 95 and bears sheet 95c, and sheet 94c, 93c are born in the margining tablet 91a of restriction body 91 that slides, the slip effect that 91b is engaged in the two or three slide mass 94,93, and the action of two slide masses 94,93 is restricted.

(auxiliary transmission 54)

As Fig. 2～Fig. 5, Fig. 9 and shown in Figure 10, auxiliary transmission 54 forms the tubular of direction extension forwards, backwards, mid portion at inner peripheral surface forms axle supporting walls 118, in this auxiliary transmission 54, and the secondary gear 47 of configuration on the anterior position of above-mentioned axle supporting walls 118.

Then, as Fig. 9 and shown in Figure 10, form peristome 101 on the 54b of the top of auxiliary transmission 54, this peristome 101 is covered by lever base portion lid 301.

In other words, as Fig. 2～Fig. 5, Fig. 9 and shown in Figure 10, lever base portion lid 301 is by the tubular horizontal expansion lid organizator 303 that forms the lid main body 302 covering shape and can cover above-mentioned peristome 101, extended to form to the right by this lid main body 302 and extend upward the tubular longitudinal extension lid organizator 304 that forms by the top ends of this horizontal expansion lid organizator 303 and form, top at auxiliary transmission 54, by connecting bolt 354, can be installed on the connecting flange portion 353 that on four circumferences of lid main body 302, forms with freely loading and unloading.

Then, the base portion with secondary gear lever 142 be installed in cover on the main body 302 in, the base portion of main shift lever 85 is installed near longitudinal extensions lid organizator 304 that is positioned at this pair gear lever 142, and the base portion of two levers 142,85 is assembled into one, and near lever base portion lid 301 places.

And, as shown in Figure 5, the major and minor gear lever 85,142 that one is installed on lever base portion lid 301, the concentrated area is configured in respect to the left and right sides imagining center line C1 of the gearbox portion 45 in the body direct of travel and any side about being partial to, in the present embodiment, i.e. the position on operator seat as described below 283 right sides directly over gearbox portion 45.

At this, lever base portion lid 301 is by lid main body 302, from this lid main body 302 to the left the tubular that extends to form of outside horizontal expansion lid organizator 303 and extend upward other a kind of mode that the longitudinal extension lid organizator 304 of the tubular of formation forms from the top ends of this horizontal expansion lid organizator 303, by preparing this mode, can be from right side with respect to the left and right sides imagining center line C1 of the gearbox portion 45 the car body direct of travel, promptly as present embodiment, will lead, secondary gear lever 85,142 centralized configuration become two masters in the mode on the right side of operator seat 283, secondary gear lever 85,142 concentrate one to be configured in the mode in operator seat 283 left sides.

So and since with main shift lever 85 be configured in secondary gear lever 142 near, so the driver can hold the steering wheel 282 as handle as described below with a handgrip, and suitably handles main shift lever 85 and even secondary gear lever 142 with the another hand simultaneously.

And, because major and minor gear lever 85,142 centralized configuration near each other, so, can promptly be converted to another gear lever of manipulation from handling a gear lever reliably, thereby improve operating characteristics.

Have again, because main shift lever 85 and secondary gear lever 142 base portion separately all near the assembling of lever base portion lid 301 one, then, are installed in this lever base portion lid 301 in the gearbox portion 45, so, can easily two gear levers 85,142 be connected in gearbox portion 45.As a result, can improve the fitting operation efficient of major and minor gear lever 85,142.

In addition, since major and minor gear lever 85,142 can the one centralized configuration on any position on operator seat 283 left sides and right side directly over the gearbox portion 45, so, by major and minor gear lever 85,142 being configured on any one position, the left and right sides, and can improve the operating characteristics and the operating efficiency of major and minor gear lever 85,142 according to driver's preference or operating condition etc.

Below, with reference to Fig. 5, Fig. 9 and Figure 10, specify the mounting structure of mounting structure, secondary gear 47 and the main shift lever 85 of secondary gear lever 142.

(mounting structure of secondary gear lever 142)

Secondary gear lever 142 is connected via secondary gear lever fulcrum 141 and secondary gear 47 as described below, this pair gear lever fulcrum 141, between lid main body 302 left and right sides sidewalls of above-mentioned lever base portion lid 301, its axis laterally sets up towards left and right directions, simultaneously, also make right-hand end 336 outwards outstanding from right side wall, the base end part of secondary gear lever 142 is installed on this right-hand end 336, in addition, under secondary gear lever fulcrum 141, dispose axis and pitch fulcrum 135 towards the retaining of dialling of fore-and-aft direction, on this group retaining fork fulcrum 135, the base end part 137 of dialling retaining fork 136 can be installed with being free to slide, base end part be connected the top ends of the coupled arm 143 on the above-mentioned secondary gear lever fulcrum 335 being connected on this base end part 137.

(secondary gear 47)

As Fig. 4, Fig. 7 and shown in Figure 9, for secondary gear 47, via planetary gears 115 secondary variable-speed shaft 116 is connected and constitutes in the top ends (rearward end) of above-mentioned main transformer speed main shaft 58, the top ends of main transformer speed main shaft 58 extends back and becomes the central gear 117 of a part that constitutes planetary gears 115, on the other hand, secondary variable-speed shaft 116 be disposed at main transformer speed main shaft 58 same axis on, and middle part is supported in be arranged on the axle supporter 118 in the auxiliary transmission 54 via bearing 119, and, top ends (rearward end) is supported in be arranged on above-mentioned axle supporting walls 100 in the aftermentioned differential box 55 via bearing 120.

For planetary gears 115, on above-mentioned supporting walls organizator 50, by axis forwards, backwards the construction bolt 123 of direction a pair of internal gear supporter 121 in front and back that forms ring-type and be disposed at the periphery of central gear 117 is installed, 122, at two internal gear supporters 121,2 are supported internal gear (inner gear) 124 between 122, the a plurality of planetary gears 125 of devices spaced apart ground configuration on the circumferencial direction of this internal gear 124, and make each planetary gear 125 be engaged in internal gear 124 and central gear 117 both sides, on the other hand, pinion frame 128 is installed between the inner periphery portion of a pair of internal gear supporter 121 in front and back, on this pinion frame 128, is connected a plurality of planetary gears 125 integratedly and constitutes.

And pinion frame 128 rearward extends back edge portion and to be provided with and to form the gear shape of tubular in blocks 129, forms internal tooth 130 on the inner peripheral surface of this gear shape in blocks 129.

And, between the outer peripheral face of the base end part (leading section) 114 of the outer peripheral face of central gear 117 and secondary variable-speed shaft 116, on axis direction, move the carrier wheel supporter 132 of spline fitted tubular freely.

And, on this carrier wheel supporter 132, engage the top ends 138 that above-mentioned group of retaining fork 136 arranged.

So, by with secondary gear lever 142 rotating operation on fore-and-aft direction, and make carrier wheel supporter 132 shift action on fore-and-aft direction, carry out secondary variable speed operation.

That is to say, the secondary gear lever 142 if rotate backward, then via secondary gear lever fulcrum 141, transmission arm 143 rotates forward, the retaining of dialling that is connected in the top ends of this transmission arm 143 pitches 136 to front slide, and the carrier wheel supporter 132 that is engaged in this group retaining fork 136 moves forward.

At this moment, carrier wheel supporter 132 is under the state between the outer peripheral face of the base end part (leading section) 114 of the outer peripheral face of crossing over central gear 117 and secondary variable-speed shaft 116 and be moved, via this carrier wheel supporter 132, central gear 117 and secondary variable-speed shaft 116 become the state that is connected (state that main transformer speed main shaft 58 and secondary variable-speed shaft 116 directly combine).

Thereby at this place, shift position, power is delivered to secondary variable-speed shaft 116 from integrally formed central gear 117 on main transformer speed main shaft 58 via carrier wheel supporter 132.

In addition, if secondary gear lever 142 is rotated forward, then via secondary gear lever fulcrum 114, transmission arm 143 rotates backward, the retaining fork 136 of dialling that is connected in the top ends of this transmission arm 143 slides backward, and the carrier wheel supporter 132 that is engaged in this group retaining fork 136 moves backward.

And, carrier wheel supporter 132 breaks away from from the outer peripheral face of central gear 117, move on the outer peripheral face of base end part (leading section) 114 of secondary variable-speed shaft 116, and anterior carrier wheel 133 is engaged in the internal tooth 130 that forms on the inner peripheral surface of gear shape in blocks 129.

Thereby, at this place, shift position, the rotatory force of integrally formed central gear 117 is delivered to the planetary gear 125 → pinion frame 128 → base end part 114 of the anterior carrier wheel 133 → carrier wheel supporter 132 → secondary variable-speed shaft 116 of internal tooth 130 → carrier wheel supporter 132 of integrally formed gear shape in blocks 129 on this pinion frame 128 that is engaged in this central gear 117 on main transformer speed main shaft 58.

At this moment, the power that is decelerated via planetary gears 115 is delivered to secondary variable-speed shaft 116 from main transformer speed main shaft 58, carries out secondary speed change.

(mounting structure of main shift lever 85)

As Fig. 5, Fig. 9 and shown in Figure 10, main shift lever 85, via the above-mentioned lever-linked mechanism 300 lever universal driving shaft 81 that is being connected, this lever-linked mechanism 300 is configured in the above-mentioned lever base portion lid 301.

Promptly, lever-linked mechanism 300, transverse strands is located between the left side wall and longitudinal extension lid organizator 304 that covers main body 302, make at the upwardly extending trace 305 of right and left and on left and right directions, be free to slide and can freely rotate around its axis, the outstanding downwards universal driving shaft side effect sheet 306 that is provided with from the left side that is positioned at the trace 305 that covers main body 302, the bottom of this universal driving shaft side effect sheet 306 is engaged with the upper end that sheet 84 is born in the universal driving shaft side effect that is arranged on above-mentioned lever universal driving shaft 81 rear ends, on the other hand, right-hand end at the trace 305 that is positioned at longitudinal extension lid organizator 304, project upwards and the effect of lever side is set bears sheet 307, the upper end that makes this lever side effect bear sheet 307 engages with the bottom of lever side effect sheet 85a.

Then, upper end at longitudinal extension lid organizator 304, portion 308 is born in the swing that is connected with tubular, in portion 308 is born in this swing, dispose can be all around any direction freely swings roughly is spherical swing supporter 309, mid portion at this swing supporter 309 is formed with the through hole 310 that connects on above-below direction, in this through hole 310, insert and be connected with lever side effect sheet 85a, simultaneously, mid portion at this lever side effect sheet 85a is connecting swing supporter 309 by axis towards the fulcrum 311 that left and right directions connects.312 are arranged on swing bears portion 308 and the swing supporter of swing between the supporter 309 by pressing spring, and the 313rd, be covered with the flexible lid of lever side effect sheet 85a.

In addition, main shift lever 85, couples together them by connecting pin 332 with when match in its bottom in the upper end that makes above-mentioned lever side effect sheet 85a.

So,, make this main shift lever 85 rotary manipulation on direction all around, the bottom of lever side effect sheet 85a is swung all around on the direction by swing supporter 309 by controlling the upper end of main shift lever 85.

Then,, bear sheet 84 on fore-and-aft direction, lever universal driving shaft 81 is slided on fore-and-aft direction and can bear the effect of sheet 307 → trace 305 → universal driving shaft side effect sheet 306 → universal driving shaft side via the effect of lever side by lever side effect sheet 85a is swung.

In addition, on left and right directions, swing, bear sheet 84, lever universal driving shaft 81 is rotated around its axis and can bear the effect of sheet 307 → trace 305 → universal driving shaft side effect sheet 306 → universal driving shaft side via the effect of lever side by making lever side effect sheet 85a.

Thereby, can successfully carry out above-mentioned Pyatyi variable speed operation by this main shift lever 85.

At this,, between lid main body 302 and trace 305 left end, be provided with and be positioned at the branch location location division 314 of variable speed operation direction branch location at the move operation of main shift lever 85 on left and right directions of neutral position as Fig. 5 and shown in Figure 10.

Promptly, as shown in figure 10, branch location location division 314, left side at the top 315 of covering main body 302, perforation is accommodated vertical hole 316 and is formed at the upwardly extending ball of upper and lower, via accommodating the lower ending opening portion 317 in vertical hole 316 from this ball by pressing spring 318, make the bottom of place kick 319 outstanding, on the other hand, on the outer peripheral face of the left end of trace 305, adjacent left-interface groove 320, central engaging groove 321 and the right side engaging groove 322 of being formed with on left and right directions all can engage the bottom of place kick 319 in any one engaging groove.The 436th, from the spring maintenance body of top maintenance, be fixed on ball and accommodate in vertical hole 316 by pressing spring 318.

So, when when main shift lever 85 is made in the neutral position drilling, trace 305 slides, the bottom of place kick 319 is engaged with central engaging groove 321, and when main shift lever 85 from this state left during (right side) rotary manipulation, trace 305 (right side) left slides, and the bottom of place kick 319 is engaged with a left side (right side) engaging groove 320 (322).

Thereby, move on the move operation position even the driver also can perceive main shift lever 85 in the neutral position by feel.As a result, just can improve the operating characteristics of main shift lever 85.

In addition, as shown in Figure 7, between the leading section of the top of the inner support wall 57 of main-gear box 53 and slide mass fulcrum 80, each shift position is provided with shift position location division 323, so that the move operation of main shift lever 85 on fore-and-aft direction is positioned.

In other words, top in the inner support wall 57 of main-gear box 53, form the perforation supported hole 324 that connects the leading section that supports slide mass fulcrum 80, inner support wall 57, upwards form ball from the top side face of this perforation supported hole 324 and accommodate vertical hole 325, the lower ending opening portion 326 of accommodating vertical hole 325 from this ball is outstanding via the bottom that makes place kick 328 by pressing spring 327, on the other hand, on the outer peripheral face of the leading section of slide mass fulcrum 80, engaging groove 329 before adjacent being formed with on fore-and-aft direction, inter-engagement groove 330 and back engaging groove 331, the bottom of place kick 328 is bonded in any one engaging groove.

So, when when main shift lever 85 is made in the neutral position drilling, slide mass fulcrum 80 slides, the bottom of place kick 328 engages with central engaging groove 330, when main shift lever 85 under this state forward during (back) rotary manipulation, slide mass fulcrum 80 is (back) slip forward just, and the bottom of place kick 328 just engages with back (preceding) engaging groove 331 (329).

Thereby the driver just can perceive in each shift position with feel and carry out speed change.Its result can improve the operating characteristics of main shift lever 85.

In addition, the 54d place is formed with peristome 102 in the bottom of auxiliary transmission 54, through this peristome 102 front vehicle wheel as described below is installed and drives with power taking-up portion 103, and this front vehicle wheel drives the secondary gear 47 that is being connected respectively with power taking-up portion 103.

(differential box 55)

As Figure 11 and shown in Figure 12, differential box 55 forms the box-shaped of top opening, on left and right sides sidewall 55a, 55b, be formed with peristome 104,104 respectively, be provided with rear axle casing 8,8 via each peristome 104,104 connection, in each rear axle casing 8,8, be penetrated with the back axle 105,105 that extends along left and right directions, simultaneously, also support them and can freely rotate, each back axle 105,105 box of tricks 48 that is being connected.

Then, differential box 55 utilizes axle supporting walls 100 to form antethecas, and the rearward end and the 3rd that is supporting secondary variable-speed shaft 116 by this supporting walls 100 is cut apart the middle part of power transmission shaft 247.

Thereby, as Figure 11 and shown in Figure 12, in differential box 55, on the top, be formed with maintenance peristome 106, four circumferences at this peristome 106 are installed with the rear arm supporting body 339 that can freely load and unload, on the oil pressure stream support chip 340 that this rear arm supporting body 339 is extended to form forward, oil pressure stream 341 can be installed with freely loading and unloading, on this oil pressure stream 341, control valve 342 be installed.

So, owing to being independent of lift arm 339, oil pressure stream 341 and pressure control valve 342 form, so, even in the rear arm supporting body 339 that forms by casting, form under the situation of cavity, because hydraulic oil is not by this rear arm supporting body 339, so, there is no need to worry because leakage of oil etc. and cavity is caused ill effect.

And, when making rear arm supporting body 339, also be easily for the countermeasure that produces cavity, thereby, can improve the qualification rate of this rear arm supporting body 339, can reduce manufacturing cost.

And rear arm supporting body 339 miniaturization as much as possible itself makes and is making, adding and dispose easily man-hour, thereby reduces manufacturing cost.

Then, owing to need not be that the rear arm supporting body 339 of heavier object just takes out from gearbox portion 45 can loading and unloading oils baric flow road 341 and control valve 342 with itself, so the performance of keeping in repair is better.

In addition, because fixing mounting oil pressure stream 341 on the oil pressure stream support chip 340 that lift arm 339 extends to form forward, so, in gearbox portion 45, be equipped with under the state of rear arm supporting body 339 in advance, even oil pressure stream 341 is fixed on the oil pressure stream support chip 340, also can under the state that in advance oil pressure stream 341 is fixed on the oil pressure stream support chip 340, integral body be installed in the gearbox portion 45, can carry out assembling operation with good efficiency according to different conditions such as operating conditions.

Then, because pressure control valve 342 is installed in the oil pressure stream 341, so, pressure control valve 342 and oil pressure stream 341 can be concentrated thick and fast place in, they one can also be fixed on rear arm supporting body 339 and even the oil pressure stream support chip 340, thereby, can improve their assembling performance.

And, be independent of the oil pressure stream 341 that rear arm supporting body 339 is made, can make the device centralized configuration of valve type, make tightr.

Below, specify the structure of above-mentioned rear arm supporting body 339, oil pressure stream 341 and pressure control valve 342 with reference to Figure 11～Figure 16.

(rear arm supporting body 339)

As Figure 13～shown in Figure 16, rear arm supporting body 339 has the ring-type installation sheet 343 that is consistent on four circumferences of the peristome 106 that forms with top at differential box 55 and is used to install, upwards erect the oil pressure stream support chip 340 of the tubular that supports oil pressure stream 341 in the front portion of this installation sheet 343 and upwards erect the pair of right and left axle support chip 345,345 of pivotal support lift arm fulcrum 344 at the rear portion of installation sheet 343.

On installation sheet 343, a plurality of (in the present embodiment are 10) of formation between the place ahead of pair of right and left axle support chip 345,345 and left and right sides and two axle support chips 345,345 are as the construction bolt hole 346 of installing hole, simultaneously, construction bolt hole 346 between two axle support chips 345,345 disposes near the lift arm fulcrum 344 in axle support chip 345,345 upper supports.

Promptly, as Figure 14 and shown in Figure 16, leading section at installation sheet 343 is formed with a construction bolt hole 346, at the center by this construction bolt hole 346 on the left-right symmetry position of the upwardly extending imagining center line C2 in front and back, be formed with four construction bolt holes 346 at fore-and-aft direction respectively with certain interval, be formed with a construction bolt hole 346 at the rear portion of the installation sheet 343 that is positioned at above-mentioned imagining center line C2, be positioned at pair of right and left axle support chip 345, between 345 and be positioned at lift arm fulcrum 344 under the part of installation sheet 343 on be formed with up recess 347 with the rear opening, wherein, this construction bolt hole, rear portion 346 is formed in this recess 347.

So, owing to can guarantee enough intensity by the wall shape of axle support chip 345,345, so, there is no need on the installation sheet 343 beyond two axle support chips 345,345, to form wall again.

And, because the pair of right and left axle support chip 345 that on this installation sheet 343, forms, the construction bolt hole 346 that forms between 345, be formed in pair of right and left axle support chip 345, between 345, and be located at lift arm fulcrum 344 under the part of installation sheet 343 on the recess 347 that forms, so, can make at axle support chip 345, the construction bolt hole 346 that forms between 345 disposes near being supported on a support chip 345, lift arm fulcrum 344 on 345, have under the situation of tensile load even on this lift arm fulcrum 344, act on, there is not the effect of bending moment at the rear portion of installation sheet 343 yet, therefore, can form the installation sheet 343 of thin-walled, make it possible to realize lightweight.

And, can on position all around, form well balanced construction bolt hole 346 on the installation sheet 343, thereby, can guarantee the installation strength of installation sheet 343.

Particularly, can form construction bolt hole 346 from the top at installation sheet 343 fully, so, can process more easily.

And, because the enough a kind of instruments of energy carry out the fitting operation of installation sheet, so, the fitting operation of installation sheet 343 is oversimplified.

In addition, lift arm fulcrum 344 need not core, and installation sheet 343 do not extend back, only with very closely up and down two moulds of cutting apart just can cast, so it is cheap for manufacturing cost.

As shown in figure 15, at pair of right and left axle support chip 345,345 top, be formed with respectively fulcrum through hole 348 in the left and right directions upper shed, 348, at two fulcrum through holes 348, in 348, set up the lift arm fulcrum 344 of axis towards left and right directions lateral direction penetrating, left and right end portions 349 at this lift arm fulcrum 344, on 349, be separately installed with lift arm 350,350 base end part, as Fig. 2～shown in Figure 5, at each lift arm 350, between 350 the centre and the bottom of differential box, be provided with lift cylinder 351 flexible on above-below direction, 351, by two lift cylinder 351,351 make lift arm 350,350 rotational action up and down.

Make the lift cylinder of lift arm rotational action about in the of 350,350, carried out oil pressure control by pressure control valve 342 via oil pressure stream 341.

Wherein, lift cylinder 351 adopts single-lift oil cylinder, extend action by supplying with hydraulic oil, lift arm 350 is moved up, on the other hand, by discharging hydraulic oil, undertaken under reachly by the own wt of the Work machine (not shown) that is connected with lift arm 350, make lift arm 350 to turning down.

In addition,, be provided with grease fitting 352,352, as the lubricating grease supply unit that is used for supplying with lubricating grease to lift arm fulcrum 344 in the upper end of each support chip 345,345.

So, on the outer peripheral face of the part that is supported on the lift arm fulcrum 344 on each support chip 345, supply with (oilings) such as greases as lubricating grease by the grease fitting 352,352 that is arranged on each support chip 345,345 upper end, thereby, can guarantee that transverse strands is located at the good rotating property of the lift arm fulcrum 344 between two axle support chips 345,345.

And rear arm supporting body 339 can be guaranteed enough intensity by the wall shape of axle support chip 345,345, the result, owing to need not to support wall beyond the part of axle support chip 345,345 of lift arm fulcrum 344, so can realize lightweight.

(oil pressure stream 341)

As Figure 13, Figure 16～shown in Figure 180, oil pressure stream 341 is made of with integrally formed being connected with lip portions 356 on the circumference of the lower end of this stream phosphor bodies 355 the stream phosphor bodies 355 of bulk.

Then, shown in Figure 16 (b), stream phosphor bodies 355, be formed with the upper strata oil circuit at an upper portion thereof and form face 357, simultaneously, also shown in Figure 16 (a), be formed with lower floor's oil circuit in its underpart and form face 358, being formed with the upper strata oil circuit that extends in vertical direction in the middle part in left side connects with vertical oil circuit 359, the upper end that this upper strata oil circuit is connected with vertical oil circuit 359 is connecting upper strata oil circuit formation face 357, on the other hand, being formed with the lower floor's oil circuit that extends in vertical direction in the middle part, back connects with vertical oil circuit 360, the upper end that this lower floor's oil circuit is connected with vertical oil circuit 360 is connecting 358, two vertical oil circuits 359 of lower floor's oil circuit formation face, 360 bottom is connecting pressure control valve as described below 342.

Below, for convenience, illustrate that at first lower floor's oil circuit forms face 358, illustrate that then the upper strata oil circuit forms face 357, illustrates both contacts subsequently.

Promptly, shown in Figure 16 (a), lower floor's oil circuit forms face 358, be form in the bottom of stream phosphor bodies 355 on same horizontal plane at fore-and-aft direction and even the upwardly extending oil circuit of right and left, form the rear extension oil circuit 361 that the front end mid portion by these stream phosphor bodies 355 bottoms extends back and forms, the vertical oil circuit 362 that about the upwardly extending front portion of right and left, extends with the rear end of this rear extension oil circuit 361, with 362 parallel left side, the rear portion extension oil circuits 363 that extend to form to the left front by the back right-hand end of extension oil circuit about this front portion, extend oil circuit 364 with vertical the place ahead, rear center position that extends to form forward from the rear center position of left end that oil circuit 363 is extended in this left side, rear portion, and extend oil circuit 364 parallel the place aheads, back left side that extend to form forward from the left side, back with this place ahead, rear center position and extend oil circuit 365.

Then, the leading section of oil circuit 364 is extended in the place ahead, rear center position, connecting the upper end of above-mentioned lower floor oil circuit connection with vertical oil circuit 360, on the other hand, the leading section that oil circuit 365 is extended in the place ahead, left side, back is connecting the middle part of upper strata oil circuit connection with vertical oil circuit 359.

In addition, extend the leading section of oil circuit 361 in the wings, be provided with the pump connecting portion 366 that is connected with the gear pump (not shown), the left end of extending oil circuit 362 forwardly is provided with pressure-reducing valve 367, and the right-hand end of extending oil circuit 362 simultaneously about this front portion is provided with and the conveyor side valve connecting portion 368 that divides the control valve (not shown) to be connected.The right-hand end of extending oil circuit 363 in rear portion left side be provided with divide that control valve is connected return side valve door connecting portion 369.At the rear portion that oil circuit 365 is extended in the place ahead, left side, back, connection is provided with single action compressed oil outside and takes out with connecting portion (single-motion pressurized-oil external takeoutconnecting portion) 370.

Shown in Figure 16 (b), the upper strata oil circuit form face 357 be form on stream phosphor bodies 355 tops on same horizontal plane at fore-and-aft direction and even the upwardly extending oil circuit of right and left, from the top leading section of stream phosphor bodies 355 be formed on left and right directions have at interval extend back first, second, the 3rd, the 4th rear extension oil circuit 371,372,373,374, in addition, form the right side extension oil circuit 375 that extends to the right from the upper left-hand end of stream phosphor bodies 355, right-hand end from stream phosphor bodies 355 tops forms first of survey extension left simultaneously, second, oil circuit 376 is extended in the 3rd left side, 377,378, and, be formed on perforation oil circuit 379 about the rear portion that connects on the left and right directions at the rear portion of stream phosphor bodies 355.

Then, the first rear extension oil circuit 371, the left side that oil circuit 375 is extended on its anterior and above-mentioned right side is vertical, and the upper end of above-mentioned upper strata oil circuit connection with vertical oil circuit 359 followed by its rear end company headquarters.

The second rear extension oil circuit 372, thereafter the end is connecting the centre that connects oil circuit 379 about above-mentioned rear portion, and be provided with flow control valve 380 in its front portion, this flow control valve 380 is provided with outstanding forward release handle 381, when its centre is connected with the left end of above-mentioned second left side extension oil circuit 377, its rear portion is connected with the left end that oil circuit 378 is extended in the 3rd left side, extends in the oil circuit 378 in the 3rd left side to be provided with safety valve 382.

The 3rd rear extension oil circuit 373, when its posterior end was connecting the right-hand end of above-mentioned right side extension oil circuit 375, the position, intermediate portion was connecting the left end that oil circuit 376 is extended in above-mentioned first left side, and this connecting portion is provided with check valve 383.

The 4th rear extension oil circuit 374, oil circuit 376 is extended vertical the time in position and first left side therebetween, and the end is connecting the right side that oil circuit 377 is extended in second left side thereafter.

In addition, about above-mentioned rear portion, connect the right and left end of oil circuit 379, be respectively arranged with lift cylinder connecting portion 384,384, connecting each lift cylinder connecting portion 384,384 and above-mentioned lift cylinder 351,351 through the oil pressure pump (not shown).

As Figure 17 and shown in Figure 180, rear portion, left side at stream phosphor bodies 355, be formed on the oil tank that connects on the above-below direction and return vertical oil circuit 385 as the discharging oil circuit, the upper end of returning vertical oil circuit 385 at this oil tank is provided with oil tank connecting portion 386, on this oil tank connecting portion 386, connecting oil pressure jar (not shown), and oil tank returns the lower ending opening of vertical oil circuit 385 in valve lid 387 as described below through oil pressure pipe.The 388th, decompression discharging oil circuit, this decompression discharging oil circuit 388, its upper end is connecting the rear end of rear extension oil circuit 361, and its lower ending opening is in valve lid 387 as described below.

So, be pressed to hydraulic oil the pump connecting portion 366 from gear pump, according to following approach by force feed: extend oil circuit 362 → conveyor side valve connecting portion 368 → minute control valve (not shown) → return left side side, valve connecting portion 369 → rear portion about rear extension oil circuit 361 → front portion and extend oil circuit 363 → rear center part the place ahead and extend oil circuit 364 → lower floor oil circuit and connect with vertical oil circuit 360 → pressure control valve 342 → upper strata oil circuit and connect with perforation oil circuit 379 → each lift cylinder connecting portion 384 about vertical oil circuit 359 → the first rear extension oil circuits 371 → right side extension oil circuit 375 → the 3rd rear extension oil circuit 373 → check valve 383 → the first left sides extension oil circuit 376 → the 4th rear extension oil circuit 374 → the second left sides extension oil circuit 377 → flow control valve 380 → the second rear extension oil circuits 372 → rear portion, 384 → each lift cylinder 351,351, so, can make each lift cylinder extend action.

In addition, hydraulic oil in each lift cylinder 351,351 can turn back in the hydraulic pressure oil tank via following approach: connect the 371 → upper strata oil circuit connection of oil circuit 379 → the second rear extension oil circuits 372 → flow control valve 380 → right side extension oil circuit 375 → the first rear extension oil circuits about each lift cylinder connecting portion 384,384 → rear portion and return vertical oil circuit 385 → this oil tank connecting portion 386 → hydraulic oil pipe → hydraulic pressure oil tank with vertical oil circuit 359 → pressure control valve 342 → valve lid 387 → oil tank as described below.

At this moment, supply with and discharge hydraulic oil, can be undertaken by switching pressure control valve as described below 342 to lift cylinder 351,351.

As mentioned above, in stream phosphor bodies 355, form two layer states up and down that the upper strata oil circuit forms face 357 and lower floor's oil circuit formation face 358, form face 357 at each oil circuit, in 358, when forming fore-and-aft direction and the upwardly extending oil circuit of right and left, also required oil circuit mutually orthogonal is connected, in stream phosphor bodies 355, form the oil circuit that extends in vertical direction, form any one oil circuit of forming in the face 358 and all under plumbness, be connected owing to form face 357 and lower floor oil circuit, so simple and reliably formation oil pressure stream in stream phosphor bodies 355 with pressure control valve 342 as described below at the upper strata oil circuit.

At this, if oil circuit is in same plane, just be not limited at fore-and-aft direction and left and right directions, as long as be suitable for connect the bearing of trend of hydraulic oil pipe, just can extend and form in required direction.As a result, the connection of hydraulic oil pipe and the operation of pipe arrangement are more prone to.

As Figure 13, Figure 17 and shown in Figure 180, the connection of oil pressure stream 341 can covered a plurality of bolt-throughs of formation hole 390 on four circumferences of the above-mentioned oil pressure stream support chip 340 that forms on the rear arm supporting body 339 with flange 356.

Then, upper surface at oil pressure stream support chip 340, form and above-mentioned bolt-through hole 390 corresponding a plurality of bolt mounting holes 391, each bolt mounting holes 391 is all suitable with each the bolt-through hole 390 that is connected with flange 356, simultaneously, by with connecting bolt 392 by two holes 390 and 391 of being threaded, oil pressure stream 341 can freely connected on the oil pressure stream support chip 340 with loading and unloading.

(pressure control valve 342)

As Figure 17 and shown in Figure 180, the valve plunger 396 that pressure control valve 342 has valve body 395 and is connected with this valve body 395 is below oil pressure stream 341, through distance piece 397, with the state that hangs down valve body 395 is installed, valve plunger 396 is outstanding backward from this valve body 395.

Below above-mentioned oil pressure stream 341, valve lid 387 is installed, in this valve lid 387 pressure control valve 342 is housed, the emission of this pressure control valve 342 can return vertical oil circuit 385 by the oil pressure jar as discharge-channel via the emission reception space S that forms and discharge in valve lid 387.

And, in emission receives space S, reclaim by being arranged on the emission of each Valved discharge in the oil pressure stream 341.

At this, the box-shaped of opening above valve lid 387 forms, below oil pressure stream 341, by the construction bolt 398 end margin portion 389 that is installed on it, make it be in air-tight state, simultaneously, on the rear wall of this valve lid 387, form the outstanding hole 400 of valve plunger through diaphragm seal 399, give prominence to the top ends that valve plunger 396 is exposed in hole 400 by this valve plunger, it can be free to slide front and back.

Then, be pressed spring 401 of valve plunger 396 is given elastic force to projected direction.

So, because mounted valve lid 387 on the oil pressure stream of installing on the rear arm supporting body 339 341 that can freely load and unload, in this valve lid 387, pressure control valve 342 is housed, so, before it being assembled in the rear arm supporting body 339, can carry out performance and functional check to the pressure control valve 342 of single-piece.

As a result, the inspection of performance and function is more prone to, makes the testing fixture miniaturization and carry by manpower easily.

In addition, as Figure 13, Figure 17 and shown in Figure 180, valve lid 387 is installed oil pressure stream 341 on oil pressure stream support chip 340, and the bottom 403 of this valve lid 387 of the setting of will hanging down on this oil pressure stream 341 is configured in the gearbox portion 45.

So, owing to oil pressure stream 341 is installed in the differential box 55 through rear arm supporting body 339, so, in of sealing place of this rear arm supporting body 339, can adopt the sealing means of prior art with the installed surface of differential box 55.

And, because the bottom 402 of valve lid 387 is configured in the differential box 55, so, oil pressure stream 341 can be arranged on overhead not too high part, this just can guarantee to be positioned at the design freedom of operator seat 283 setting height(from bottom)s directly over this oil pressure stream 341.

In addition, the valve plunger 396 of above-mentioned pressure control valve 342 can be through being arranged on the valve plunger action movie 403 at oil pressure stream body support chip 340 rear portions, and (with reference to Figure 15) operates by lifting lever 404, simultaneously, by feedback link mechanism 405 lifting stopped.

Promptly, as Figure 13, Figure 15 and shown in Figure 16, in the action movie through hole 406 that the rear portion of oil pressure stream support chip 340 forms, insert the axis alignment and the bar-shaped valve plunger action movie 403 of fore-and-aft direction, it can be free to slide front and back, this valve plunger action movie 403 is configured on the axis identical with the valve plunger 396 of pressure control valve 342, and is relative with it on fore-and-aft direction.

And, the rear portion of valve plunger action movie 403, be supported on the installation sheet 343 through action movie supporter 407, rearward end at this valve plunger action movie 403, utilize axis supporting middle part at the upwardly extending swing sheet 408 of right and left towards the axle supporting pin 409 of above-below direction, swing the left and right sides double pointed nail 410 of the left and right end portions of sheet 408 respectively at this, 411 project upwards, left-interface pin 410 engages with the left-interface effect pin 412 of feedback link mechanism 405 from behind, and right side double pointed nail 411 engages from behind with right side conjugation pin 413 that lifting lever 404 is connected.

Then, feedback link mechanism 405, be provided with the left side boss portion 414 of extending at left and right directions in the back left side of installation sheet 343, in this left side boss portion 414, insert logical left side universal driving shaft 415, the base end part of coupled arm 416 is installed in the left end of this left side universal driving shaft 415, the top ends that is connecting connecting rod 417 in the top ends of this coupled arm 416, make the position of its connection can free adjustment, the rearward end of this connecting rod 417 connecting the top ends that projects upwards the double-action plate 418 of setting from the left end of above-mentioned lift arm fulcrum 109.419, the 420th, connecting pin, the 421st, set bolt.

On the other hand,, give prominence to that downwards left side interlock protrusion tab 422 being set, give prominence to the right that by the lower end of this left side interlock protrusion tab 422 above-mentioned left-interface effect pin 412 being set in the right-hand end of left side universal driving shaft 415.

In addition, right lateral side at installation sheet 343 is provided with in the upwardly extending right side of right and left boss portion 423, in this right side boss portion 423, insert logical right side universal driving shaft 424, the be connected base end part of above-mentioned lifting lever 404 of the right-hand end of this right side universal driving shaft 424, and at the downward outstanding right side interlock protrusion tab 425 that is provided with of the left end of right side universal driving shaft 424, the outstanding left setting above-mentioned right side conjugation pin 413 from the bottom of this right side interlock protrusion tab 425.

At this, lifting lever 404 and above-mentioned major and minor gear lever 85,142 are same, and centralized configuration is on the right side of operator seat 283, and this has just guaranteed the good operation performance of these levers 85,142 and 404.

So, lifting lever 404 is rotated backward carry out on during lift operations, right side conjugation pin 413 engages with right side double pointed nail 411 from behind, the right-hand end that will swing sheet 408 via this right side double pointed nail 411 pushes forward.

At this moment, because the left end of swing sheet 408 is fixing by left-interface effect pin 412 via left-interface pin 410, so, the valve plunger action movie 403 that connects via the axle supporting pin 409 in the middle part of this swing sheet 408 is to front slide, make valve plunger 396 opposings by the elastic force of pressing spring 401 to front slide.

As a result, valve body 395 rises and carries out the action of Open valve, is pressed into hydraulic oil to lift cylinder 351,351, and two lift cylinder 351,351 are extended action, lift arm 110,110 ascending motions that are connected with each lift cylinder 351,351.

Then, the ascending motion of feedback link mechanism 405 and lift arm 110,110 is interlock mutually, the left-interface effect pin 412 of this feedback link mechanism 405 is rotated backward, through fixedly being disengaged of left-interface pin 410 pairs of swings sheet 408 left end, as a result, owing to valve plunger 396 is slided backward, return to the neutral position by the elastic force of pressing spring 401, this moment, valve body 395 carried out the action of valve-off, made hydraulic oil stop to flow in the lift cylinder 351,351.

In addition, rotate forward when carrying out step-down operation at lifting lever 404, right side conjugation pin 413 is isolated with right side double pointed nail 411.

The result, because the elastic force by pressing spring 401 slides backward valve plunger 396, valve body 395 descends and carries out the action of Open valve, the hydraulic oil that is pressed in the lift cylinder 351,351 is flowed out, two actions that lift cylinder 351,351 shortens, the lift arm 110,110 that is connected with each lift cylinder 351,351 rotates with regard to descending.

At this moment, because the left end of swing sheet 408 is fixing by left-interface effect pin 412 via left-interface pin 410, so, the valve plunger action movie 403 that connects via the axle supporting pin 409 that is supported on these swing sheet 408 middle parts slides backward, and through right side double pointed nail 411 right-hand end of swing sheet 408 is moved backward.

Then, feedback link mechanism 405 is rotatedly connected moving with the decline of lift arm 110,110, the left-interface effect pin 412 of this feedback link mechanism 405 is rotated forward, the left end that to swing sheet 408 via left-interface pin 410 is pressed to the place ahead, valve plunger 396 just resists and presses the elastic force of pressing spring 401 to front slide as a result, turn back to the neutral position, this moment, valve body 395 carried out the action of valve-off, stopped to be pressed into hydraulic oil to lift cylinder 351,351.

At this, feedback link mechanism 405, by regulating the position that coupled arm 416 top ends are connected with connecting rod 417 top ends, and neutral position that can control valve plunger 396.

As shown in figure 11, form peristome 111, PTO speed changing portion 6 is installed on this peristome 111 in the rear end of differential box 55, below, with the structure of this PTO speed changing portion 6 of narration.

(box of tricks 48)

As Figure 11 and shown in Figure 12, box of tricks 48 is arranged between above-mentioned secondary variable-speed shaft 116 and the pair of right and left back axle 105,105, in the integrally formed output of top ends (rearward end) of the secondary variable-speed shaft 116 of the rear extension of axle supporting walls 100 with bevel gear (bevel gear) 180, in addition, back axle input gear 181,181 is installed on the base end part of each back axle 105,105, will export and import gear 181,181 with bevel gear 180 via box of tricks 48 and each back axle and be connected.

Promptly, box of tricks 48 is equipped with the big retarding gear 183 that is meshed with bevel gear 180 with above-mentioned output on the outer peripheral face of differential box 182, and in differential box 182, via in front and back upwardly extending little differential gearing fulcrum 184 and be equipped with before and after a pair of little differential gearing 185,185, it can freely be rotated, simultaneously, via at the big differential gearing fulcrum 186,186 of the upwardly extending pair of right and left of right and left, and the big differential gearing 187,187 of pair of right and left is installed, each big differential gearing 187,187 is meshed with two little differential gearings 185,185.

Tubular integrally formed on the left and right sides of differential box 182 is communicated with brace 188, on 188, can chimeric axis pair of right and left tubular axle supporter 189 on the left and right directions, 189, it can freely be communicated with loading and unloading connects, be communicated with brace 188 by each tubular, each tubular axle supporter 189 in 188, in 189, pass and support above-mentioned big differential gearing fulcrum 186,186, from each big differential gearing fulcrum 186,186 tubular axle supporter 189, on 189 parts of giving prominence to, install respectively and above-mentioned back axle input gear 181,181 travelling gears that are meshed 190,190, each big differential gearing fulcrum 186,186 top ends, connecting detent as described below 191,191 advance with brake 192,192, it can freely be loaded and unloaded.

So, be passed to the rotatory force on the secondary variable-speed shaft 116, transmit: import gear 181,181 → each back axle 105,105 → each rear wheel 9,9 with bevel gear 180 → big retarding gear 183 → gearbox portion 182 → little differential gearing fulcrum 184 → each little differential gearing 185,185 → each big differential gearing 187,187 → each big differential gearing fulcrum 186,186 → each travelling gear 190,190 → each back axle in the output that the top ends (rearward end) of this pair variable-speed shaft 116 is integrally formed according to following order.

In addition, pair of right and left tubular axle supporter 189,189, from the outside and when peristome 194,194 tablings are used in the installation that the left and right sides of auxiliary transmission 54 sidewall 55a, 55b form, installed and can freely be loaded and unloaded by construction bolt 195,195, gearbox portion 182 can be erected between two tubular axle supporters 189,189 with freely loading and unloading.

Then, each tubular axle supporter 189,189, after taking off construction bolt 195,195, by pulling out with peristome 194,194 outside sides from installing, can from auxiliary transmission 54, take out, at this moment, though each big differential gearing fulcrum 186,186 also can from the differential box of each tubular axle supporter 189,189 one take out.

Thereby, the differential box 182 that between two tubular axle supporters 189,189, sets up with freely loading and unloading, after taking out each tubular axle supporter 189,189, the maintenance that can form from the top at auxiliary transmission 54 is taken out with peristome 106.

In addition, detent 191, configuration is advanced with brake 192 in brake box 196, and this is advanced and is braked and removed the operation of braking with brake 192 through braking action sheet 197 by brake operating lever 198.The 199th, be supported on the brake bar fulcrum on the brake box 196.

Then, brake box 196 is installed in the state that sets up between the outer peripheral face bottom of the sidewall of auxiliary transmission 54 and rear axle casing 8 with freely loading and unloading, can unload from the top ends of big differential gearing fulcrum 186 by therefrom taking out this brake box 196 and the advancing with brake 192 of this brake box 196 one.

Below, illustrate that with reference to Fig. 4 and Fig. 9 above-mentioned front vehicle wheel drives with power taking-up portion 103.

(front vehicle wheel drives with power taking-up portion 103)

As Fig. 4 and shown in Figure 9, front vehicle wheel drives with power taking-up portion 103, be that taking-up portion casing 160 is installed on the peristome 102 of the bottom of auxiliary transmission 54 formation, in this taking-up portion casing 160, set up the front vehicle wheel driving shaft 164 of axis towards fore-and-aft direction through front and back pair of bearings 162,163, input gear 165 is installed, at this input gear 165 be installed between the output gear 166 at secondary variable-speed shaft 116 rear portions through first, second idler gear 167,168 and formation in the middle part of this front vehicle wheel driving shaft 164.

At this, first idler gear 167, in be installed in PTO as described below system power transmission shaft 169 through bearing 170 on with freely loading and unloading, second idler gear 168, be in auxiliary transmission 54, to set up fulcrum 173 on the outstanding a pair of gear support chip 171,172 in front and back that forms, install with rotating freely through the bearing 174 on this gear fulcrum 173.

Be connected to output gear 166, first idler gear 167, second idler gear 168 and the 165 polyphone engagements of input gear.

In addition, front vehicle wheel driving shaft 164, its top ends 175 is outstanding forward from taking-up portion casing 160, and these top ends 175 process power transmission shafts etc. are connected with the power shaft (not shown) that is arranged in the front bearing box.

So, the rotatory force of secondary variable-speed shaft 116, transmit via following approach, carry out advancing of four wheel drive: be installed in output gear 166 → the first idler gears 167 → the second idler gears 168 → input gear 165 → front vehicle wheel driving shaft 164 → power transmission shaft on the secondary variable-speed shaft 116 etc. → power shaft → front axle → front vehicle wheel 7,7.

In addition, in the present embodiment, it is chimeric that spline is carried out in the middle part of input gear 165 and front vehicle wheel driving shaft 164, can with position that second idler gear 168 is meshed on removing move on the position engaged in, from the outside of taking-up portion casing 160, carry out the move operation of this input gear 165 by move operation mechanism (not shown).

So, when importing the move operation of gear 165 and 168 engagements of second idler gear, carry out advancing of above-mentioned four wheel drive, and when carrying out the engagement of the move operation releasing input gear 165 and second idler gear 168, carrying out two wheel drive of rear wheel driving advances, suitably carry out the handover operation that four wheel drive is advanced and two wheel drive are advanced according to different operating conditions, thereby, can carry out operation with good efficiency.

(Drive Section 5)

As shown in Figure 1, Drive Section 5 is in the position at prime mover portion 2 rears and standing above clutch portion 3 steering column 280 is set, upper end at this steering column 280, through wheel disc fulcrum 281 steering wheel 282 is installed, at the rear of this steering wheel 282 configuration operator seat 283, at the side of this operator seat 283 centralized configuration main shift lever 85 and secondary gear lever 142.

(PTO speed changing portion 6)

As shown in figure 11, PTO speed changing portion 6, free installation PTO casing 200 load and unload on the peristome 111 that forms in the rear end of the differential box 55 of gearbox portion 45 disposes PTO gear 201 in this PTO casing 200.

Below, with reference to Figure 11 (PTO casing 200) and (PTO gear 201) structure separately is described successively.

(PTO casing 200)

As shown in figure 11, PTO casing 200 is divided into anterior casing organizator 202, middle housing organizator 203 and rear portion casing organizator 204, each casing organizator 202,203 and 204 is connected each other and can freely loads and unloads, anterior casing organizator 202 and middle housing organizator 203 are positioned in the differential box 55, and systematicness side 204 in rear portion is the state of bulging from the rear of differential box 55 simultaneously.

At the integrally formed flange shape installation sheet 205 of rear portion casing organizator 204 front ends four circumferences, this installation sheet 205 from behind with contacted while of back edge portion of differential box 55, install towards the construction bolt 206 of fore-and-aft direction by axis.

So, owing on the peristome 111 of the rear end of differential box 55 formation, the PTO casing can be installed with freely loading and unloading, so, under the state that from the differential box 55 of gearbox portion 45, takes out PTO casing 200, just can be easy to carry out with this PTO gear 201 pack into this PTO casing 200 interior assembling operation or maintenance activity.

And, owing to install under the state of PTO casing 200 in the differential box 55 of gearbox portion 45 that anterior casing organizator 202 and middle housing organizator 203 are packed into, so just can realize the miniaturization (close mode) of gearbox portion 45.

Forwardly be formed on the power shaft aspis 207 of fore-and-aft direction upper shed on the casing organizator 202, be used to accept power shaft 230, above this power shaft aspis 207, form the anterior bearing of variable-speed shaft portion 208.

Be provided with the bearing plate 209 that is used to bear PTO axle 232 in middle housing organizator 203, this bearing plate 209 is formed on the anterior bearing 212 of PTO axle of fore-and-aft direction upper shed in the middle part.

So, because bearing plate 209 is arranged on the front end face 210 of middle housing organizator 203, and the molding box structure that middle housing organizator 203 is shaped is simpler, thus the cost of this molding box reduced.

And, because the front end face 211 of the front end face 210 of middle housing organizator 203 and bearing plate 209 is in one plane, so, can simply and reliably carry out shaping, the processing of middle housing organizator 203.

On rear portion casing organizator 204, be formed on the PTO aixs cylinder export department 214 of fore-and-aft direction upper shed, above this PTO aixs cylinder export department 214, form variable-speed shaft rear bearings portion 215.

Then, forwardly the power shaft aspis 207 that forms on the casing organizator 202, in anterior bearing 212 of the PTO axle that forms on the middle housing organizator 203 and the PTO aixs cylinder export department 214 that on rear portion casing organizator 204, forms, be connected to form upwardly extending same axis in front and back.

In addition, the anterior bearing of the variable-speed shaft that forwardly forms on the casing organizator 202 portion 208 and variable-speed shaft rear bearings portion 215 configuration relatively on fore-and-aft direction of on rear portion casing organizator 204, forming.

At this, on the axle support chip 345,345 of above-mentioned rear arm supporting body 339, be installed with and be used to support and the upper connecting rod carriage 216 that is connected upper connecting rod 12 front ends, this upper connecting rod carriage 216 by the tabular mount pad of installing with the rear adjacent of two axle support chips 345,345 and by construction bolt 220 217 and from the tabular axle of the rearwardly projecting pair of right and left in the back of this mount pad 217 support, brace 218,218 forms.Among Figure 15, the 219th, pass the connecting hole of construction bolt 220.

In addition, on the left and right sides sidewall of rear portion casing organizator 204, the outwards outstanding lift cylinder fulcrum 221,221 that is provided as the upper connecting rod mounting portion, between each lift cylinder fulcrum 221,221 and above-mentioned lift arm 350,350 middle parts, be provided with the lift cylinder 351,351 of expanding-contracting action on above-below direction.The 223rd, lift cylinder connecting pin, the 224th, lift cylinder axle support and connection sheet.

So, owing to be configured in the pair of right and left lift cylinder 351,351 of expanding-contracting action on the above-below direction in the left and right side of rear portion casing organizator 204, the lower end of each lift cylinder 351,351 is supported on the rear portion casing organizator 204 through lift cylinder fulcrum 221,221 simultaneously, so two lift cylinder 351,351 just are easy to become the posture of vertical and even approximate vertical, just can shorten the stroke of each lift cylinder 351,351, except the miniaturization that can realize each lift cylinder 351,351, can also reduce power loss.

And because the bottom of each lift cylinder 351,351, process lift cylinder fulcrum 221,221 is supported on the rear portion casing organizator 204, so, can support each lift cylinder 351,351 very securely.

(PTO gear 210)

As shown in figure 11, PTO gear 210 disposes power shaft 230, variable-speed shaft 231 and the PTO axle 232 of axis towards fore-and-aft direction respectively in above-mentioned PTO casing 200.

In other words, on the power shaft aspis 207 that forms on the anterior casing organizator 202 of PTO casing 200, can support power shaft 230 through bearing 233,234 with rotating freely, the top ends 235 of this power shaft 230 is outstanding forward, and the rear end is provided with output gear 236.

Then, the anterior bearing of the variable-speed shaft that forms on the casing organizator 202 portion 208 and between the variable-speed shaft rear bearings portion 215 that forms on the rear portion casing organizator 204 forwardly, via bearing 237,238, can support variable-speed shaft 231 with rotating freely, on this variable-speed shaft 231, coaxial successively backward in the past integrally formed major diameter input gear 239, second stud gear 240, first stud gear 241, major diameter input gear 239 and the output gear 236 that is arranged on the above-mentioned power shaft 230 are meshed.

In addition, at the anterior bearing 212 of the PTO axle that forms on the middle housing organizator 203 with between the PTO aixs cylinder export department 214 that forms on the rear portion casing organizator 204,, supporting PTO axle 232 via bearing 242,243 with rotating freely.

And, PTO axle 232 is that spline is chimeric with carrier wheel 244, it can be free to slide at axis direction, simultaneously, input gear 267 can be installed in the above with rotating freely, carrier wheel body 244 is provided with major diameter carrier wheel 268 and minor diameter carrier wheel 269, on the other hand, in the front of input gear 267, form and embed meshing gear 270, embed engagement with above-mentioned minor diameter carrier wheel 269.

Have again, by carrier wheel body 244 being carried out the operating mechanism 272 of PTO speed change, can make major diameter carrier wheel 268 and above-mentioned second stud gear 240 engagements carry out the 2nd PTO variable speed operation and make minor diameter carrier wheel 269 and embedding meshing gear 270 embed a PTO variable speed operation of engagement.

Then, PTO axle 232, its top ends (rearward end) 273 is outstanding backward from the PTO aixs cylinder export department 214 that forms at rear portion casing organizator 204.

So, in the present embodiment, because forwardly casing organizator 202 upper supports power shaft 230, forwardly supporting variable-speed shaft 231 between casing organizator 202 and the rear portion casing organizator 204, between middle housing organizator 203 and rear portion casing organizator 204, supporting PTO axle 232, so, these configuration degree of freedom of 230,231 and 232 are strengthened, simultaneously, can also dispose closelyr, and can be arranged on simple and reliablely between each gear on 230,231,232 engagement be connected.

Have again, because PTO casing 200 is divided into anterior casing organizator 202, middle housing organizator 203 and rear portion casing organizator 204 by three, so, can forwardly by variable-speed shaft 231 major diameter input gear 239, second stud gear 240 and first stud gear 241 be installed between casing organizator 202 and the rear portion casing organizator 204 very simply, variable-speed shaft 231 and each gear 239,240,241 can be set simple and reliablely, thereby the efficient of the assembling operation of PTO gear 201 can be improved.

Then, PTO axle 232 is provided with clutch mechanism 275, the operation that this clutch mechanism 275 connects or cuts off by clutch operating mechanism 276.

In addition, as shown in Figure 4, the top ends 235 of power shaft 230, constituting the PTO that is connected with above-mentioned outside driving shaft 20 via PTO system power transmission shaft 169 is transmission mechanism 52, PTO system power transmission shaft 169, its axis are configured to the rear portion towards fore-and-aft direction and in gearbox portion 45 always from the front portion.

(PTO system power transmission shaft 169)

As shown in Figure 4, PTO system power transmission shaft 169 is cut apart power transmission shaft 245,246,247,248 with first～the 4th and is connected and form on fore-and-aft direction.

As Fig. 4 and shown in Figure 6, first cuts apart power transmission shaft 245, be erected between the rear wall 27 and above-mentioned inner support wall 57 of clutch housing 17 via bearing 249,250, be provided with input gear 244 in this first middle part of cutting apart power transmission shaft 245, this input gear 244 is meshed with PTO driven wheel 20c.

In addition, as shown in Figure 4, second cuts apart power transmission shaft 246, the position, intermediate portion in above-mentioned axle supporting walls organizator 50 upper supports via bearing 251 with rotating freely, simultaneously, via the first tubular connector 252, make its leading section connect above-mentioned first rearward end of cutting apart power transmission shaft 245.

As Fig. 4 and shown in Figure 9, the 3rd cuts apart power transmission shaft 247, on axle supporter 118, supporting the position, intermediate portion via bearing 253 with rotating freely, simultaneously, also making its leading section connect above-mentioned second rearward end of cutting apart power transmission shaft 246 via the second tubular connector 254.

As Fig. 4 and shown in Figure 11, the 4th cuts apart power transmission shaft 248, via one-way clutch (oneway clutch) 255 its leading section is connected with the above-mentioned the 3rd rearward end of cutting apart power transmission shaft 247, simultaneously, also making thereafter via the second tubular connector 256, the end is connected with the top ends 235 of above-mentioned power shaft 230.

At this, one-way clutch 255 is to cut apart the anterior clutch organizator 257 on the rearward end of power transmission shaft 247 and be installed in the 4th rear portion clutch organizator of cutting apart on the leading section of power transmission shaft 248 258 and form by being installed in the 3rd, outstanding meshing flake 259 and the outstanding meshing flake 260 that is arranged on clutch organizator 258 fronts, rear portion that is arranged on anterior clutch organizator 257 back, under the relative state in front and back, be meshed, when forward rotation, two meshing flakes 259,260 engage, make third and fourth to cut apart power transmission shaft 247 and 248 and on the turn direction, rotate together, on the other hand, when backward rotation, two meshing flakes 259 and 260 can not engage each other.

So, be delivered to the power of the outside on the driving shaft 20 from engine 15, just with following order transmission: cut apart power transmission shaft 247 → the first tubular connectors 252 → the second with the integrally formed PTO driven wheel 20c → input gear 244 → the first of this outside driving shaft 20 and cut apart power transmission shaft 246 → the second tubular connector 254 → three and cut apart power transmission shaft 247 → one-way clutch 255 → 4th and cut apart power transmission shaft 248 → the 3rd tubular connector 256 → power shaft 230.

Then, under the situation of PTO gear 201 quilts according to a PTO variable speed operation, be delivered to the power on the power shaft 230, transmitted in the following order: major diameter carrier wheel 268 → PTO axle 232 of input gear 236 → major diameter input gear 239 → variable-speed shaft 231 → first stud gear 240 → carrier wheel body 244, can take out power from each PTO axle 232 and drive various Work machines.

In addition, under the situation of PTO gear 201 quilts according to the 2nd PTO variable speed operation, be delivered to the power on the power shaft 230, transmit in the following order: minor diameter carrier wheel 269 → PTO axle 232 of embedding meshing gear 270 → carrier wheel body 244 of output gear 236 → major diameter input gear 239 → variable-speed shaft 231 → second stud gear 241 → input gear 267 → this input gear 267, can take out power from this PTO axle 232 and drive various Work machines.

At this moment, accept PTO axle 232 reverse rotations of load from various Work machines, even cutting apart power transmission shaft 248 through power shaft 230 → the 3rd tubular connector 256 → 4th, transmits its power, but cut apart and be provided with one-way clutch 255 between the power transmission shaft 247 owing to cut apart power transmission shaft 248 and the 3rd the 4th, power also can not cut apart power transmission shaft 248 from the 4th and be delivered to the 3rd and cut apart on the power transmission shaft 247.

Thereby,, just can prevent unfavorable conditions such as this mobile system transmission mechanism 51 of damage by being delivered to from the power reverse of PTO axle 232 on the mobile system transmission mechanism 51 based on main speed-changing mechanism 46.

Figure 19 and Figure 20 represent the lift arm 350,350 as another embodiment, this lift arm 350,350, integrally formed via rotating boss portion 430 with its base end part, this rotating boss portion 430, match with the middle part of lift arm fulcrum 344 between pair of right and left axle support chip 345,345, pair of right and left lift arm 350,350 is that rotation is together rotated at the center via rotating boss portion 430 with lift arm fulcrum 344.

So, since via rotating boss portion 430 that pair of right and left lift arm 350,350 is integrally formed, so the installation exercise of two lift arms 350,350 can carry out easily.

Figure 21 represents the branch location location division 314 as another embodiment, and this branch location location division 314 is provided with the adjusting male threaded shank 431 of regulating part as location intensity.

Promptly, regulating forms at upper and lower upwardly extending bar-shaped with male threaded shank 431, simultaneously, on its outer peripheral face, form outer screw section 432, be applied in the left side at the top 315 of covering main body 302 and accommodate vertical hole 316 at the ball that above-below direction extends to form, accommodate at this ball and form negative thread portion 433 on the top inner peripheral surface in vertical hole 316, in this negative thread portion 433, screw in to regulate with male threaded shank 431, between this adjusting is with the bottom of male threaded shank 431 and place kick 319, be provided with by pressing spring 318.

Then, regulate,, simultaneously, be provided with in top ends (upper end) and regulate 434 outstanding from lid main body 302 with major and minor gear lever 85,142 roughly same axis directions with male threaded shank 431.The 435th, fixedly use nut.

So, regulate 434 and make to regulate and rotate, suitably regulate by pressing spring 318 and affact pressing force in the place kick 319 with male threaded shank 431 by holding, thereby, can enough this place kick 319 regulate location intensity.

Thereby the driver can seek feel according to the hobby of oneself, can improve the operability of main shift lever 85.

At this moment, because branch location location division 314, prevent simultaneously also when transferring power that unlike shift position location division 323 gear from deviating from, so, there is no need to keep certain above detent force, the driver just can freely regulate location intensity according to the hobby of self and obtain feel.

Since regulate 434 be with major and minor gear lever 85,142 outstanding formation on the direction of same axis roughly, the driver easily holds from above and regulates 434, simultaneously can be smoothly and position adjusting by this adjusting 434 reliably.

The possibility of utilizing on the industry

The structure of tractor of the present invention is making gearbox section outside, via rear arm supporting body Laterally set up axis towards the lift arm fulcrum of left and right directions, install left at this lift arm fulcrum Right a pair of lift arm between the middle part and gearbox subordinate section of each lift arm, is provided with In the flexible lift cylinder of above-below direction, the structure that lift arm is rotated up and down by this lift cylinder In be useful.

Claims (3)

1. tractor is characterized in that:

Outside at gearbox, be provided with the lift arm fulcrum of axis via the rear arm supporting body transverse strands towards left and right directions, on this lift arm fulcrum, the pair of right and left lift arm is installed, between the bottom of the middle part of each lift arm and gearbox, be provided with in the flexible lift cylinder of above-below direction, can utilize this lift cylinder to make lift arm rotational action up and down, wherein

Rear arm supporting body is provided with the lubricating oil supply unit, is used for to lift arm fulcrum supplying lubricating oil.

2. tractor as claimed in claim 1 is characterized in that:

Rear arm supporting body has the installation sheet that is used for installing and upwards erects the pair of right and left axle support chip that axle supports the lift arm fulcrum from this installation sheet on gearbox,

On installation sheet, between the place ahead of pair of right and left axle support chip and left and right sides and two axle support chips, be formed with installing hole, and the installing hole between two axle support chips is configured near the lift arm fulcrum that is supported on by axle on the support chip.

3. tractor as claimed in claim 2 is characterized in that:

Between pair of right and left axle support chip, and be positioned at the lift arm fulcrum under on the part of installation sheet of position, form the recess of top and rear defence opening, in this recess, be formed with two installing holes between the axle support chip.

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