CN204736918U - Working vehicle - Google Patents

Abstract

The utility model provides a working vehicle, its purpose passes to the problem that turns to the device and damage operation nature for solve the oily fluid oscillation of pressure that flows in turning to the switching control valve. The utility model discloses a working vehicle constitutes for controlling front wheel (2, 2) and turn to through following pressure oil to the supply of power steering jar (103) and the horizontal slip action of exhaust sliding shaft (103c), making, and above -mentioned working vehicle's characterized in that turns to switching control valve (110) with controlled pressure oil to the supply of above -mentioned power steering jar (103) and exhaust and fixes the upper surface in gearbox (12). In addition, turn to switching control valve (110) at the lower surface mounting of the rake formed at valve casing (111) (111a), fix the upper surface in gearbox (12) with this valve casing (111). Make valve casing (111) and turn to the concave part space (118a) that switching control valve (110) are located anterior panel (118).

Description

Working truck

Technical field

The utility model relates to possessing and carries out the working trucks such as the agricultural tractor of the steering control system of switching controls to pressure oil to the supply of the steering cylinder mechanism of front-wheel and discharge linkedly with the operation of bearing circle.

Background technology

In the past, as the steering control system of the agricultural tractor of an example of working truck, comprise to turn round with the left and right of bearing circle operate interlock turn to switching control valve, configure along front-wheel axle housing and the steering cylinder mechanism linked with each spindle arm parts of left and right front-wheel and be connected pressure oil between them for row pipeline etc., made the slide shaft left and right action of steering cylinder mechanism by the left and right revolution operation with bearing circle, thus front-wheel steer interlock (patent documentation 1) can be made.

In addition, the mode (patent documentation 2) configuring in the bottom of the steering shaft with bearing circle interlock and turn to switching control valve is had.

Prior art document

Patent documentation 1: Japanese Unexamined Patent Publication 7-117709 publication

Patent documentation 2: patent No. 2984510 publication

Utility model content

Utility model speed problem to be solved

But the switching control valve that turns to disclosed in patent documentation 1 is the structure of the inner side being configured in abutment bracket, if form like this, has to make to extend with the steering shaft of bearing circle interlock, and its configuration must be carried out driving engine etc. is roundabout.In addition, being directly connected in the mode of the patent documentation 2 of the steering shaft lower end of bearing circle interlock, turning to the fluid oscillation of the pressure oil flowed in switching control valve to pass to steering hardware, all requiring to improve.

For solving the scheme of problem

The utility model takes following technical scheme to solve above-mentioned problem.

Utility model described in scheme 1 is a kind of working truck, be configured to by with the horizontally slip action of pressure oil to the slide shaft 103c of the supply of power steering cylinder 103 and discharge, via left and right pipe link 104,104, make this front-wheel manipulate case 105 around manipulation left and right, axle center interlock from the outstanding manipulation arm 106,106 of front-wheel manipulation case 105,105, thus left and right front-wheel 2,2 is turned to

The feature of above-mentioned working truck is,

Control presssure oil is fixed on the upper surface of change speed gear box 12 to the supply of above-mentioned power steering cylinder 103 and the switching control valve 110 that turns to of discharge.

The working truck of utility model described in scheme 2 according to scheme 1, is characterized in that,

Make following structure: install at the lower surface of the rake 111a being formed at valve casing 111 and turn to switching control valve 110, this valve casing 111 is fixed on the upper surface of change speed gear box 12.

The working truck of utility model described in scheme 3 according to scheme 1 or 2, is characterized in that,

By from the steering shaft 112 turning to switching control valve 110 to give prominence to upward, be attached at on the tween drive shaft 113 of bearing circle 11 interlock via universal coupling 114.

The working truck of utility model described in scheme 4 according to scheme 2, is characterized in that,

Possesses the front panel 118 of the posture erected upward from the front of the chassis 116 of the sole supporting the operator taken in driver's seat 8, form recess space 118a in the front side of above-mentioned front panel 118, make above-mentioned valve casing 111 and turn to switching control valve 110 to be positioned at this recess space 118a.

The effect of utility model is as follows.

Utility model according to scheme 1 ~ scheme 3, owing to being by valve casing 111 and turning to switching control valve 110 to be assemblied in the structure of the upper surface of change speed gear box 12, therefore with turning to the vibration of valve 110 main body of the flowing of the pressure oil in switching control valve 110 to be difficult to, along tween drive shaft 113 arrival direction dish 11, can not steer ability be damaged.

And, utility model according to scheme 3, owing to being make to be attached at and the structure the tween drive shaft 113 of bearing circle 11 interlock from the steering shaft 112 turning to switching control valve 110 to give prominence to upward via universal coupling 114, therefore with turning to the vibration of valve 110 main body of the flowing of the pressure oil in switching control valve 110 to be more difficult to along tween drive shaft 113 arrival direction dish 11.

Utility model according to scheme 4, except the effect described in scheme 1 ~ scheme 4, front panel 118 is set and be assigned to arrange before and after this turn to switching control valve 110, valve casing, bearing circle 11 and with the steering shaft 112 of this rotation interlock, the structure of tween drive shaft 113, therefore vibrate, noise be difficult to be delivered to driver's seat 8 side.

Accompanying drawing explanation

Fig. 1 is the skeleton diagram of tractor truck.

Fig. 2 is the A direction view (observing the figure of front part of a body) of Fig. 1.

Fig. 3 is the B direction view (observing the figure of After-Body) of Fig. 1.

Fig. 4 is the C direction view (observing the figure of body upper) of Fig. 1.

Fig. 5 is the string diagram of the transmission device of the transmission system representing tractor truck.

Fig. 6 (A) is the cutaway view of the especially driving system transmission device of the transmission system representing tractor truck, and Fig. 6 (B) is the cutaway view of the especially PTO drive system mechanism of the transmission system representing tractor truck.

Fig. 7 (A), Fig. 7 (B) are the cutaway views representing PTO axle support structure and dustproof construction, and Fig. 7 (C) is its back view.

Fig. 8 is the partial side elevation view of the change speed gear box from vehicle-width direction left sides tractor truck.

Fig. 9 is the partial side elevation view of the front gear box observing tractor truck on the right side of vehicle-width direction.

Figure 10 is the partial side elevation view of the front gear box from vehicle-width direction left sides tractor truck.

Figure 11 (A), Figure 11 (B) and Figure 11 (C) are the lateral plan of the interval housing of tractor truck, back view and birds-eye view respectively.

Figure 12 is the change speed gear box of tractor truck and the birds-eye view of Fuel Tank.

Figure 13 is the lateral plan of the biopsy cavity marker devices of front-wheel axle housing and abutment bracket.

Figure 14 is the birds-eye view of front-wheel axle housing and abutment bracket.

Figure 15 is the exploded perspective view of front-wheel axle housing.

Figure 16 is the block diagram in abutment bracket portion and radiator portion.

Figure 17 (A) is the back view of the intermetallic metal part of the first embodiment, and Figure 17 (B) is its lateral plan, and Figure 17 (C) is front view.

Figure 18 is abridged, the local block diagram of the working implement-connecting apparatus representing change speed gear box rear portion.

Figure 19 (A), Figure 19 (B) and Figure 19 (C) are the cutaway views removing the lateral plan of the working implement-connecting apparatus after protective case, back view and main portion.

Figure 20 (A), Figure 20 (B) are block diagram and the back view of protective case.

Figure 21 (A), Figure 21 (B) are lateral plan, the back view of tractor truck After-Body.

Figure 22 is the sectional view of turning control cell.

Figure 23 is the exploded perspective view of turning control cell.

Figure 24 is the block diagram of control frame.

In figure:

11-bearing circle, 12-change speed gear box, 103-power steering cylinder, 104-pipe link, 105-front-wheel manipulation case, 106-manipulation arm, 110-turn to switching control valve, 111-valve casing, 112-steering shaft, 113-tween drive shaft, 114-universal coupling, 116-chassis, 118-front panel.

Detailed description of the invention

Below, embodiment of the present utility model is explained based on accompanying drawing.

In addition, in the following description, fore-and-aft direction is the fore-and-aft direction of tractor truck 1.Further, fore-and-aft direction is the direct of travel of this tractor truck 1 when advancing, and the front side of direct of travel is called the front side of fore-and-aft direction, rear side is called the rear side of fore-and-aft direction.The direct of travel of tractor truck 1 is the direction when tractor truck 1 advances from the driver's seat 8 direction dish 11 of tractor truck 1, and bearing circle 11 side is front side, and driver's seat 8 is rear side.Further, vehicle-width direction is the direction with this fore-and-aft direction horizontal quadrature.Wherein, under the state on front side of viewing fore-and-aft direction, right side is called on the right side of vehicle-width direction, under the state on front side of viewing fore-and-aft direction, left side is called on the left of vehicle-width direction.And vertical is the direction orthogonal with fore-and-aft direction and vehicle-width direction.These fore-and-aft directions, vehicle-width direction and vertical are mutually orthogonal.

Tractor truck 1 as the working truck of the present embodiment shown in Fig. 1 ~ Fig. 4 is the power that produced by propulsion source and voluntarily while carry out the working trucks such as the agricultural tractor of operation in farmland etc.Tractor truck 1 possess front-wheel 2, trailing wheel 3, as the driving engine 4 of propulsion source and transmission system (change-speed box) 5.Wherein, front-wheel 2 is arranged mainly as the wheel turned to, i.e. wheel flutter.Trailing wheel 3 is arranged mainly as the wheel, the i.e. drive wheel that drive.The rotary power transmission system (change-speed box) 5 that the driving engine 4 be equipped in the engine case 6 of front part of a body can be produced passes to trailing wheel 3 after suitably slowing down, and trailing wheel 3 produces propulsive effort by this rotary power.In addition, the rotary power that driving engine 4 produces also can be passed to front-wheel 2 by this transmission system 5 as required, and in this case, front-wheel 2 and this four-wheel of trailing wheel 3 become drive wheel, produces propulsive effort.Namely, transmission system 5 can carry out the switching of two wheel drive and four wheel drive, the rotary power of driving engine 4 can be slowed down, and the rotary power after slowing down is passed to front-wheel 2, trailing wheel 3.In addition, tractor truck 1 is equipped with the connecting device 7 that can assemble the working rigs such as slewing arrangement (omitting diagram) at After-Body.Hookup mechanism 7 adopts 3 connecting rods be such as made up of lower link 7b, the 7b about the top connecting rod 7a of central upper, bottom, links working rig at the After-Body of tractor truck 1.Tractor truck 1 makes the lift arm of left and right rotate by such as described later with hydraulic pressure, thus working rig can be elevated via lifting arm, the lower link 7b that links with this lifting arm etc.

Tractor truck 1 covers with operator's compartment 9 around the driver's seat 8 on body.The instrument carrier panel 10 of tractor truck 1 in the inside of operator's compartment 9 on front side of driver's seat 8 erects setting direction dish 11, and around driver's seat 8, be configured with the various control lever such as the various operating pedal such as pedal of clutch, brake pedal, Das Gaspedal and forward-reverse bar, shifter bar.

Fig. 5 is the string diagram of the transmission device 13 represented in the change speed gear box 12 of transmission system 5.Transmission system 5 comprises change speed gear box 12 (with reference to Fig. 1), is configured in this change speed gear box 12 and forms from driving engine 4 to the transmission device 13 of the transmitting rotary power such as trailing wheel 3.The working rig that rotary power from driving engine 4 is passed to front-wheel 2, trailing wheel 3 and is arranged on body by transmission device 13, and utilize the rotary power from driving engine 4 to drive these mechanisms.

Specifically, transmission device 13 is configured to comprise input shaft 14, forward-reverse switching mechanism 15, Hi-Lo speed-changing mechanism 16, main speed-changing mechanism 17, secondary speed-changing mechanism 18,2WD/4WD switching mechanism 19, PTO (Power take-off, power take-off implement) driver train 20 etc. as high-low speed change mechanism.The rotary power that driving engine 4 can produce by transmission device 13 is successively via input shaft 14, forward-reverse switching mechanism 15, Hi-Lo speed-changing mechanism 16, main speed-changing mechanism 17, secondary speed-changing mechanism 18 and be passed to trailing wheel 3.In addition, transmission device 13 rotary power that driving engine 4 can be produced is successively via input shaft 14, forward-reverse switching mechanism 15, Hi-Lo speed-changing mechanism 16, main speed-changing mechanism 17, secondary speed-changing mechanism 18,2WD/4WD switching mechanism 19 and be passed to front-wheel 2.Further, transmission device 13 rotary power that driving engine 4 can be produced is successively via input shaft 14, PTO driver train 20 and be passed to working rig.

Input shaft 14 is combined with the output shaft of driving engine 4, inputs the rotary power from driving engine 4.

Forward-reverse switching mechanism 15 can switch to transmitting from driving engine 4 rotary power come the mechanism that working direction rotates or direction of retreat rotates.Forward-reverse switching mechanism 15 is configured to comprise advance side gear stage 15a, retrogressing side gear level 15b, counter gear 15c, the advance hydraulic pressure multiple disk clutch C1 of hydraulic pressure multiple disk clutch mode, retrogressing hydraulic pressure multiple disk clutch C2.Forward-reverse hydraulic pressure multiple disk clutch C1, C2 can switch the bang path of the power in forward-reverse switching mechanism 15 by switching engaging/disarm state.The rotary power being passed to input shaft 14 is correspondingly changed bang path with the engaging/disarm state of forward-reverse hydraulic pressure multiple disk clutch C1, C2 and is passed to tween drive shaft 21 by forward-reverse switching mechanism 15.

Forward-reverse switching mechanism 15 when advance hydraulic pressure multiple disk clutch C1 be fastening state, to retreat hydraulic pressure multiple disk clutch C2 be disarm state, the rotary power being passed to input shaft 14 to be rotated with working direction via advance side gear stage 15a, advance hydraulic pressure multiple disk clutch C1 and is passed to tween drive shaft 21.Forward-reverse switching mechanism 15 when advance hydraulic pressure multiple disk clutch C1 be disarm state, to retreat hydraulic pressure multiple disk clutch C2 be fastening state, by the rotary power being passed to input shaft 14 via retrogressing side gear level 15b, counter gear 15c, retreat hydraulic pressure multiple disk clutch C2 and to rotate with direction of retreat and be passed to tween drive shaft 21.Thus, forward-reverse switching mechanism 15 can switch the forward-reverse of tractor truck 1.

Further, forward-reverse switching mechanism 15 plays a role as master clutch, by making forward-reverse hydraulic pressure multiple disk clutch C1, C2 become disarm state simultaneously, thus becomes neutral state, can cut off the transmission of power to front-wheel 2, trailing wheel 3 side.Forward-reverse switching mechanism 15 by the outer forward-reverse changer lever of such as worker application drawing, thus can switch advance, laggard, neutral gear by fluid control.Further, forward-reverse hydraulic pressure multiple disk clutch C1, C2 can be made to become disarm state by stepping on operated clutch pedal simultaneously.

Hi-Lo speed-changing mechanism 16 is for enabling the rotary power that comes from driving engine 4 transmission in the mechanism of high speed level or low speed turbine stage speed change.Hi-Lo speed-changing mechanism 16 is configured to comprise Hi (at a high speed) side gear level 16a, Lo (low speed) side gear level 16b, hydraulic pressure multiple disk clutch (Hi (at a high speed) side power-transfer clutch) C3, hydraulic pressure multiple disk clutch (Lo (low speed) side power-transfer clutch) C4.Hydraulic pressure multiple disk clutch C3, C4 switch the bang path of the power in Hi-Lo speed-changing mechanism 16 by switching engaging/disarm state.The rotary power being passed to tween drive shaft 21 is correspondingly changed bang path with the engaging/disarm state of hydraulic pressure multiple disk clutch C3, C4 and is passed to variable shaft 22 by Hi-Lo speed-changing mechanism 16.Hi-Lo speed-changing mechanism 16 when hydraulic pressure multiple disk clutch C3 be fastening state, hydraulic pressure multiple disk clutch C4 be disarm state, the rotary power that is passed to tween drive shaft 21 is passed to variable shaft 22 via hydraulic pressure multiple disk clutch C3, Hi side gear level 16a speed change.

Hi-Lo speed-changing mechanism 16 when hydraulic pressure multiple disk clutch C3 be disarm state, hydraulic pressure multiple disk clutch C4 be fastening state, by the rotary power being passed to tween drive shaft 21 via hydraulic pressure multiple disk clutch C4, Lo side gear level 16b speed change be passed to variable shaft 22.Thus, rotary power from driving engine 4 can be passed to rear class with the converter speed ratio speed change of the converter speed ratio of Hi side gear level 16a or Lo (low speed) side gear level 16b by Hi-Lo speed-changing mechanism 16.Hi-Lo speed-changing mechanism 16 such as makes the outer Hi-Lo change-over switch (high-low speed change operating switch) of figure become on/off by operator, thus Hi (at a high speed) side, Lo (low speed) side can be switched by fluid control, speed change can be carried out in the arbitrary level at a high speed and in low speed these 2 grades.In addition, Hi-Lo speed-changing mechanism 16 utilize above-mentioned structure can in the driving process of tractor truck 1 speed change.

Main speed-changing mechanism 17 can will transmit next rotary power with any one speed change of multiple speed change level from driving engine 4.Main speed-changing mechanism 17 is the speed-changing mechanism of synchronous matching formula, at this, can will transmit the rotary power speed change come from driving engine 4 via forward-reverse switching mechanism 15 and Hi-Lo speed-changing mechanism 16.Main speed-changing mechanism 17 comprises first grade of gear stage 17a, second gear gear stage 17b, third gear gear stage 17c, fourth speed gear stage 17d, fifth speed gear stage 17e, sixth speed gear stage 17f and form as multiple speed change level.Main speed-changing mechanism 17 with and first grade of gear stage 17a ~ sixth speed gear stage 17f variable shaft 22 bonding state correspondingly, by the rotary power being passed to variable shaft 22 via any one in first grade of gear stage 17a ~ sixth speed gear stage 17f speed change be passed to variable shaft 23.Thus, rotary power from driving engine 4 can be passed to rear class with arbitrary grade of converter speed ratio speed change in first grade of gear stage 17a ~ sixth speed gear stage 17f by main speed-changing mechanism 17.Main speed-changing mechanism 17 such as operates main transformer speed control lever (not shown) by operator and can select and switch the one-level in multiple speed change level, can with arbitrary grade of speed change in first grade of gear stage 17a ~ sixth speed gear stage 17f these 6 grades.In addition, main speed-changing mechanism 17 utilize above-mentioned structure can in the driving process of tractor truck 1 speed change.

Secondary speed-changing mechanism 18 can will transmit the rotary power speed change come successively via forward-reverse switching mechanism 15, Hi-Lo speed-changing mechanism 16 and main speed-changing mechanism 17 from driving engine 4.Secondary speed-changing mechanism 18 is configured to comprise the first demultiplicator 24, second demultiplicator 25 etc., and the rotary power that is passed to variable shaft 23 is passed to variable shaft 26 via the first demultiplicator 24, second demultiplicator 25 iso-variable velocity.First demultiplicator 24 can will transmit from driving engine 4 and rotary power in main speed-changing mechanism 17 grade after speed change is passed to trailing wheel 3 side as drive wheel after high speed level or low speed turbine stage speed change.Second demultiplicator 25 can will transmit from driving engine 4 and rotary power after main speed-changing mechanism 17 iso-variable velocity is passed to trailing wheel 3 side as drive wheel after the Ultra-Low Speed level speed change than the first demultiplicator 24 more low speed.In addition, when requiring to use simplification, the second demultiplicator 25 is omitted.

First demultiplicator 24 of secondary speed-changing mechanism 18 is configured to comprise the first gear 24a, the second gear 24b, the 3rd gear 24c, the 4th gear 24d, selector 24e.First gear 24a can integrally rotatably be combined with variable shaft 23, and transmits (input) rotary power from variable shaft 23.Second gear 24b engages with the first gear 24a.3rd gear 24c integrally rotatably can be combined with the second gear 24b.4th gear 24d engages with the 3rd gear 24c.Selector 24e is the mechanism of the bonding state of switching first gear 24a, the 4th gear 24d and variable shaft 26.Namely, with the clutch claw 26a that variable shaft 26 is wholely set, with the clutch claw 24ac of the first gear 24a one, be formed as same diameter, the identical number of teeth configuring with adjacency state with the clutch claw 24dc of the 4th gear 24d one, selector 24e is configured to, if clutch claw 26a and clutch claw 24ac engages simultaneously, then power is passed to variable shaft 26 from the first gear 2a, if clutch claw 26a and clutch claw 24dc engages simultaneously, then power is passed to variable shaft 26 from the 4th gear 24d.In addition, each clutch claw can be configured movably at selector 24e with on any one position do not engaged in clutch claw 24ac and clutch claw 24dc.

Any one that can move in Hi (at a high speed) side position that the first gear 24a and variable shaft 26 can be integrally rotatably combined, Lo (low speed) side position, the first gear 24a and the 4th gear 24d that the 4th gear 24d and variable shaft 26 can be integrally rotatably combined of selector 24e is not combined with variable shaft 26 and the center position (Neutral Position) removed.Accordingly, the rotary power that will be passed to variable shaft 23 switches bang path and is passed to variable shaft 26 in the position of the first demultiplicator 24 and selector 24e.

Second demultiplicator 25 of secondary speed-changing mechanism 18 is configured to comprise the first gear 25a, the second gear 25b, the 3rd gear 25c, the 4th gear 25d, selector 25e.First gear 25a can integrally rotatably be combined with the 4th gear 24d of the first demultiplicator 24.Second gear 25b engages with the first gear 25a.3rd gear 25c integrally rotatably can be combined with the second gear 25b.4th gear 25d engages with the 3rd gear 25c.Selector 25e is the structure of the bonding state of switching the 4th gear 25d and variable shaft 26.Namely, same diameter, the identical number of teeth configuring with adjacency state is formed as with the clutch claw 26b that variable shaft 26 is wholely set with the clutch claw 25dc of the 4th gear 25d one, selector 25e is configured to, if clutch claw 26b engages with clutch claw 25dc simultaneously, then power is passed to variable shaft 26 from the 4th gear 25d.

Selector 25e can move to the center position (Neutral Position) that super Lo (Ultra-Low Speed) side position, the 4th gear 25d that the 4th gear 25d and variable shaft 26 can integrally rotatably be combined are not combined with variable shaft 26 and remove.In this situation, the rotation of variable shaft 26 is arranged by the selector 24e position of the first demultiplicator 24.Accordingly, the rotary power that will be passed to variable shaft 23 switches bang path and is passed to variable shaft 26 in the position of the second demultiplicator 25 and selector 25e.Second demultiplicator 25 when the first demultiplicator 24 be the state of neutral gear, selector 25e be positioned at super Lo side position, the rotary power being passed to variable shaft 23 is slowed down from the first gear 24a of the first demultiplicator 24 successively via the first gear 25a, the second gear 25b of the second gear 24b, the 3rd gear 24c, the 4th gear 24d, the second demultiplicator 25, the 3rd gear 25c, the 4th gear 25d, selector 25e and is passed to variable shaft 26.Thus, the second demultiplicator 25 can by from driving engine 4 rotary power with via super Lo (Ultra-Low Speed) side after the second gear 24b, the 3rd gear 24c, the 4th gear 24d, the first gear 25a, the second gear 25b, the 3rd gear 25c, the 4th gear 25d converter speed ratio speed change and be passed to rear class.In addition, the second demultiplicator 25, when selector 25e is positioned at center position, becomes the state of state, the i.e. neutral gear that the 4th gear 25d dallies relative to variable shaft 26.

Therefore, secondary speed-changing mechanism 18 the arbitrary level in high speed, low speed and Ultra-Low Speed these 3 grades can will be passed to the rotary power speed change of variable shaft 23 by the first demultiplicator 24 and the second demultiplicator 25 being combined, and is passed to variable shaft 26.

Further, the rotary power being passed to variable shaft 26 is passed to trailing wheel 3 via trailing wheel diff 27, back axle 28, deceleration planetary gear reducing mechanism 29 etc. by the transmission device 13 of transmission system 5.Its result, the trailing wheel 3 of tractor truck 1 carries out rotary actuation by the rotary power from driving engine 4 as drive wheel.

2WD/4WD switching mechanism 19 is configured to comprise hydraulic pressure multiple disk clutch C6, C7, and plays a role as front-wheel speed increasing mechanism.2WD/4WD switching mechanism 19 is configured to comprise transmitter shaft 19a, Hi (at a high speed) side gear level 19b, Lo (low speed) side gear level 19c, hydraulic pressure multiple disk clutch (Lo (low speed) side power-transfer clutch) C6, hydraulic pressure multiple disk clutch (Hi (at a high speed) side power-transfer clutch) C7, transmitter shaft 19d.Hydraulic pressure multiple disk clutch C6, C7 can switch the bang path of the power in 2WD/4WD switching mechanism 19 by switching engaging/disarm state.Engaging/the disarm state of 2WD/4WD switching mechanism 19 and hydraulic pressure multiple disk clutch C6, C7 accordingly, is passed to transmitter shaft 19d after the rotary power being passed to transmitter shaft 19a is changed bang path.2WD/4WD switching mechanism 19 when hydraulic pressure multiple disk clutch C6 be fastening state, hydraulic pressure multiple disk clutch C7 be disarm state, by the rotary power being passed to transmitter shaft 19a via Lo side gear level 19c, hydraulic pressure multiple disk clutch C6 speed change be passed to transmitter shaft 19d.

2WD/4WD switching mechanism 19 is switch the mechanism whether rotary power being passed to variable shaft 26 being passed to front-wheel 2 side.2WD/4WD switching mechanism 19 is configured to comprise transmitter shaft 19a, Hi side gear level 19b, Lo side gear level 19c, transmitter shaft 19d, selector 19e.Transmitter shaft 19a transmits (input) rotary power from variable shaft 26 via gear 30, gear 31, transmitter shaft 32, coupler 33 etc.First gear 19b inserts transmitter shaft 19a, can be assembled into the relative rotation on this transmitter shaft 19a.

The rotary power being passed to transmitter shaft 19d is passed to front-wheel 2 via front wheel differential gear 34, front axle 35, the longitudinal axis 36, planetary gear reducing mechanism 37 etc. by the transmission device 13 of transmission system 5.Its result, the front-wheel 2 of tractor truck 1 and trailing wheel 3 utilize the rotary power rotary actuation as drive wheel from driving engine 4, can travel with four wheel drive.2WD/4WD switching mechanism 19 all becomes disarm state by hydraulic pressure multiple disk clutch C6, C7, thus can cut off the rotary power that the is passed to transmitter shaft 19a transmission of power to transmitter shaft 19d side.Its result, tractor truck 1 can travel with two wheel drive.

PTO driver train 20 is the rotary power transmitted from driving engine 4 by speed change and export working rig to from the PTO axle 40 (with reference to Fig. 3) of After-Body, thus utilizes the power from driving engine 4 to drive the mechanism of working rig.PTO driver train 20 is configured to comprise PTO engaging and disengaging gear 38, PTO speed-changing mechanism 39, PTO axle 40 etc.

PTO engaging and disengaging gear 38 is switch to the transmission of power of PTO axle 40 side and the mechanism of cut-out.PTO engaging and disengaging gear 38 is configured to comprise gear 38a, hydraulic pressure multiple disk clutch C5, transmitter shaft 38b.Gear 38a engages with the gear 41 that can integrally rotatably be combined with input shaft 14.Hydraulic pressure multiple disk clutch C5 is the mechanism of the transmit mode by switching engaging/disarm state and power between change gear 38a and transmitter shaft 38b.PTO engaging and disengaging gear 38 becomes fastening state by making hydraulic pressure multiple disk clutch C5, thus the PTO driving condition become to PTO axle 40 side transferring power, the rotary power being passed to gear 38a from input shaft 14 via gear 41 is passed to transmitter shaft 38b via hydraulic pressure multiple disk clutch C5.PTO engaging and disengaging gear 38 becomes disarm state by hydraulic pressure multiple disk clutch C5, thus become to the cut-off PTO non-driven state (neutral state) of the transmission of the power of PTO axle 40 side, the rotary power being passed to gear 38a is cut-off to the transmission of transmitter shaft 38b side.

In addition, this tractor truck 1 via with gear 38a gears in mesh 70a, with this gear 70a gears in mesh 70b etc. and be provided with gear type pump 70.Gear type pump 70 is the component applying hydraulic pressure to hydraulic efficiency pressure systems such as transmission devices 13.

PTO speed-changing mechanism 39 is the mechanism by carrying out speed change when transmission of power to PTO axle 40 side.PTO speed-changing mechanism 39 is configured to comprise Hi (at a high speed) side gear level 39a, Lo (low speed) side gear level 39b, transmitter shaft 39c, selector 39d.The rotary power that is passed to transmitter shaft 38b accordingly, is passed to transmitter shaft 39c via Hi side gear level 39a or Lo side gear level 39b speed change by the position of PTO speed-changing mechanism 39 and selector 39d.

PTO axle 40 is combine with operation pusher side input shaft (not shown) via universal coupling (not shown), and the rotary power from driving engine 4 is passed to the component of working rig.PTO axle 40 is positioned at the position of departing from body center due to transmitter shaft 39c, therefore drivingly can be configured in center, body left and right via the first gear 44, second gear 45 etc.

If be described in detail to PTO axle 40 supporting construction, then as shown in Fig. 7 (A) ~ Fig. 7 (C), the front side end axle of PTO axle 40 is supported on the supporting walls 46 be integrally formed in change speed gear box 12, midway axle is supported on the through hole portion formed at change speed gear box 12 rear wall, in order to limit the movement etc. of the bearing 47 of this axle support, arrange with the PTO metal piece 48 of bolted after change speed gear box 12.Further, after this PTO metal piece 48, bolt and the fastening 2nd PTO metal piece 49 of knock pin (knock pin) is used.First sealing member 50 is set between above-mentioned bearing 47 and a PTO metal piece 48, between the outside of a PTO metal piece 48 and the 2nd PTO metal piece 49, arranges the second sealing member 51.Namely, the first sealing member 50 is configured at the sealing member that formed in the inner circumferential of a PTO metal piece 48 and keeps space, and the second sealing member 51 is configured at the sealing member formed in the 2nd PTO metal piece 49 inner circumferential and keeps space.

And, make following structure, the peripheral part repack with grease of the PTO axle 40 namely, between these the first sealing member 50 and second sealing members 51, a PTO metal piece 48 arranges grease nipple 52, the grease injected via this grease nipple 52 can arrive PTO axle periphery via grease filler opening 53, and grease is filled to be held in and leaned against between sealing member 50,51 opposed privately.

As mentioned above, resistance to muddy water can be improved by double seal 50,51 and grease filling.

In addition, symbol 54 is PTO covers.

In addition, the change speed gear box 12 of present embodiment as shown in figs. 8-10, is divided into the front gear box 12F on front side of fore-and-aft direction and the rear transmission gear box 12R on rear side of fore-and-aft direction.And, the control power-transfer clutch valve 64, gear type pump 70 etc. of the control power-transfer clutch valve 55 of hydraulic pressure multiple disk clutch C1, C2 of forward-reverse switching mechanism 15, the control power-transfer clutch valve 56 of hydraulic pressure multiple disk clutch C3, C4 of Hi-Lo speed-changing mechanism 16, the control power-transfer clutch valve 57 of the hydraulic pressure multiple disk clutch C5 of PTO engaging and disengaging gear 38, hydraulic pressure multiple disk clutch C6, C7 of 2WD/4WD switching mechanism 19 as shown in Figure 9, Figure 10, are opened on the face about being configured in by the front gear box 12F of present embodiment.At this, front gear box 12F as shown in Figure 9, the face on the right side of vehicle-width direction is configured with power-transfer clutch valve 55, power-transfer clutch valve 56, power-transfer clutch valve 64.On the other hand, front gear box 12F as shown in Figure 10, the face on the left of vehicle-width direction is configured with power-transfer clutch valve 57, gear type pump 70.Its result, this tractor truck 1 can effectively by power-transfer clutch valve 55,56,57,64, gear type pump 70 etc. is configured in the outside of front gear box 12F.

Although also can be these two housing structures of front gear box 12R and rear transmission gear box 12R, be following structure in the present embodiment, between these housings 12F, 12R, namely also clip interval housing 12S (Fig. 8) of washer-shaped.Namely, interval housing 12S (Figure 11 (A) ~ Figure 11 (C)) is set between the front gear box 12F and rear transmission gear box 12R of change speed gear box 12, forms the supporting main transformer speed above-mentioned variable shaft 22 of mechanism 17 and variable shaft 23, metal section 12Sa towards the above-mentioned transmitter shaft 32 of 2WD/4WD switching mechanism 19.If form like this, then by supported by the metal section 12Sa of the interval housing 12S between front gear box 12F and rear transmission gear box 12R variable shaft 22,23, transmitter shaft 32, thus the metal construction on front side of rear transmission gear box 12R can be omitted.Although assemble to connect front gear box 12F and interval housing 12S, but the above-mentioned variable shaft 22 rearward stretched out in front gear box 12F, 23, transmitter shaft 32 can adjust weight dexterously and size all compares easy to handle interval housing 12S, alignd in center, and can by these axles all axle be supported on metal section 12Sa, can engage with after front gear box 12F simultaneously, as a result, and together with the assembling of interior cogged and axle, make the joining process of interval housing 12Sa become easy.

In addition, interval housing 12S is formed as the flange part wider a little than the left and right width of front gear box 12F, become the form forming dead space volume in the left and right side of front gear box 12F, but this dead band space segment can be utilized to arrange above-mentioned control clutch valve 55,56,57,64.

Fuel Tank 65 (being left side in legend) is set in the side, left and right one of above-mentioned front gear box 12F.Therefore, surround the side of above-mentioned PTO control clutch valve 57 and gear type pump 70, protection Fuel Tank is from the impact (Figure 12) of the collision with other things etc.

Based on Figure 13 ~ Figure 15, the structure that before and after opposing connection, axle center swingingly supports the abutment bracket 67 of front-wheel axle housing 66 is described, and this front-wheel axle housing 66 honours the front axle 35 that above-mentioned front-wheel 2 carries out driving.Above-mentioned front-wheel axle housing 66 is supported at the abutment bracket 67 of multiple crossing frame 68a, 68b, 68c, 68d of possessing left and right framework 67L, 67R and link left and right framework 67L, 67R from driving engine 4 in front.Namely, front-wheel axle housing 66 cylinder axle portion 66F, 66R of being formed at the front and back of left and right central portion with chimerism arrange before and after support cylindrical shell 69F, 69R, these are supported the fixedly connected lower frame 100R at lower surface that is identical with the lower frame 100F of the lower surface being located at above-mentioned crossing frame 68c, that be located at crossing frame 69d of cylindrical shell 69F, 69R, become thus front-wheel axle housing 66 around the common axle center supporting cylindrical shell 69F, 69R namely before and after axis swing structure freely.

The rear end of above-mentioned abutment bracket 67 and the main part 4a of driving engine 4 link, but between abutment bracket 67 and the main part 4a of driving engine 4, clamp intermetallic metal part 71 and rigid body link both.Be following structure: side is inserted bolt 72 and installed and fix intermetallic metal part 71 from the side up and down in the front of abutment bracket 67, at this intermetallic metal part 71 under the installing condition of abutment bracket 67, relative to the main part 4a of driving engine 4, insert many up and down (in legend, left and right is respectively four) bolt 73 of fore-and-aft direction, and make the rear end side of these bolts 73 chimeric with tapped bore 4b, 4c portion screw thread of the main part 4a being formed at driving engine 4 and fix.In addition, make following location structure, namely, in four three be thru-bolt 73a, 73a ... form, wherein a 73b is common bolt form, can insertion tool from the side, intermetallic metal part 71 is fixed on the main part 4a of driving engine 4.The main part 4a of driving engine 4, as the example represented in Figure 16, is following structure, and the front face namely, by cylinder housing, crank housings, oilcan body etc. strengthening structure is processed into plane, and implements hole processing.Now, in legend, in the upper side and lower side, plane machining is implemented at this two position, carries out the hole processing 4b at two positions, 4c respectively.

In addition, above-mentioned thru-bolt 73a, 73a ... each front side end and above-mentioned lower frame 100R rigid body engage, this lower frame 100R be with above-mentioned crossing frame 68 in be positioned at the crossing frame 68d coincidence status of rear side, upside is inserted be cut into arc-shaped and the through hole of brace panel 74 that formed is inserted and fixes its end with nut screwing clamping.Further, possess the 5th bolt 73c at fore-and-aft direction, the 5th bolt 73c does not arrive the main part 4a of driving engine 4, for intermetallic metal part 71 position being fixed on the locking strutcture of brace panel 74.

If form like this, then do not need the extending structure of framework 67L, 67R of left and right just driving engine 4 can be attached at axle housing 66 aft end face securely.The structure of bolt tightening can not be needed at lateral surface, therefore, it is possible to simplify outward appearance by only forming the simple structure of bolt tapped bore 4b, 4c in the front side of the main part 4a of driving engine 4.

Make following structure, namely can assist the state erecting parts 76b, 76b of assembling plate member 76a and left and right that radiator 75 is assemblied in abutment bracket 67 with the upper surface of framework 67L, 67R of the left and right at above-mentioned abutment bracket 67.Namely, the assisted group assembling structure of this radiator 75 is following structure: in the past side direction rear slide to be arranged in (Figure 16 direction of arrow) regulation bolt 78 fixing on stay bearing plate 77L, the 77R of upper surface being fixedly welded on left and right framework 67L, 67R.

In addition, symbol 79 is from loading and unloading mudguard flap freely relative to the horizontal support framework of figure above.

The hitch gear 80 of the working rigs such as trailer is formed at the rear portion of change speed gear box 12.This hitch gear 80 possesses: the hook frame 82 that a pair hanger plate 82a, 82a and left side plate 82b, the 82b up and down that can be inserted in the vertical direction by connecting pin 81 are formed; And the base component 83 at the rear portion of change speed gear box 12 is assemblied in securely by bolt etc.

Said base parts 83 are that stringer board 83a, the 83a making left and right opposed, the coupling plate 83b that links this stringer board 83a, 83a are gate and the parts integrally consisted of methods such as welding, at the rear surface of change speed gear box 12 joint coupling plate 83b and with multiple (four) bolt 84a, 84a ... fastening.In addition, in an embodiment, utilize welding method to arrange towards the lower end side front of this coupling plate 83b and fixingly use bracket 83c, this is fixed with bracket 83c is the structure of the lower surface being fastened on change speed gear box 12 by bolt 84b, 84b.In addition, stringer board 83a, 83a are formed as longer up and down, and coupling plate 83b is formed at from the pars intermedia of stringer board 83a, 83a to below.

Be the said base parts 83 relative to the rear portion being assemblied in change speed gear box 12, and detachably link the structure of hook frame 82 with two long size pins 85,85.In addition, on a pair hanger plate 82a, 82a up and down of hook frame 82, form pin-and-hole 82c, 82c at position corresponding up and down, assemble above-mentioned working rig connecting pin 81 while disengaging can be inserted in the vertical direction.Trailer can be linked thus, various working rig draws.

At the rear portion of change speed gear box 12, support above-mentioned PTO axle 40 with projected state by above-mentioned PTO metal piece 48 axle, the coupling plate 83b of said base parts 83 is not to be cut into arc-shaped with this metal piece 48 modes overlapped by upper side.The protective case 87 surrounding the outside of this PTO axle 40 is shaped in the mode that can cover left and right side and upper surface, and its shape, as shown in Figure 19 (B) chain lines, is shaped by carrying out Bending Processing to the metal sheet of deployed condition.The front face side 87a engaged below with change speed gear box 12 in each side of this protective case 87, will be circle with the outs open overlapped of above-mentioned PTO axle 40 support metal piece 86 and form peristome 87b.Further, the part (in legend for lower left quarter) in this circular open portion 87b is cut into bloats shape and make it towards above-mentioned grease nipple 52.89,89 ... protective case 87 is detachably fixed on the bolt after change speed gear box 12.

Above-mentioned 3 connecting rod hookup mechanisms 7 are set at the rear portion of change speed gear box 12.3 connecting rod hookup mechanisms 7 are made up of lower link 7b, 7b of about the top connecting rod 7a of center upper portion and bottom, wherein, top connecting rod 7a rotates freely up and down via connecting pin to be linked to and connects bulb (リ Application ク ボ ー Le portion), the end side base end part in this connection bulb is assemblied in top link bracket 90, this top link bracket 90 is fastened by bolts and is detachably linked to the rear portion of change speed gear box 12, possesses the inserting hole of the link pin of working rig in another side.Lower link 7b, 7b are at the left and right rear lower of change speed gear box 12 or form lower link bracket (not shown) with the rear axle box 91,91 that the left and right side of this change speed gear box 12 links, and be connected bulb link via connecting pin with the front of lower link 7a.Make the rear end side assembly connection ball at lower link 7b, 7b and connecting pin 92,92 can be used to link the structure of working rig.Lifting arm 93,93 is linked respectively at the middle part of lower link 7b, 7b, left and right lift arm 94a, 94a of the formation lift system 94 of this lifting arm 93,93 and change speed gear box 12 upper back link, and are to control and can the structure of lifting linkage to the supply of the pressure oil of hydraulic actuating cylinder outside figure and discharging with lift system 94.

In addition, Figure 21 (A), the lower link 7bA shown in Figure 21 (B) realize the reduction of cost as symmetrical type.Namely, flexing is formed as, and when overlooking pair of right and left lower link 7bA, more rear side is more unlimited, is formed as in this flexing portion, and front and rear end side are respectively since end is to the measure-alike of flexion position and be that flexion angle is identical.Further, make connection ball between leading section and rearward end, the link pin with lifting arm 93A is set in position, middle.If form like this, then by preparing to be formed as lower link 7bA, 7bA of same shape, either party being connected to left side, the opposing party is installed with inverted status, thus can be assembled into when overlooking be Ha type.

As shown in Figure 19 (A) ~ Figure 19 (C), Figure 21 (A), Figure 21 (B), add auxiliary cylinders mechanism 95 at lift system 94.Utilize the base component 83 of above-mentioned hitch gear 80 to support the lower end side (Figure 19 (C)) of the cylinder portion 95a of auxiliary cylinders mechanism 95, and the upper end of slide shaft 95b is linked to a side (being left side in legend) of above-mentioned left and right lift arm 94a.This auxiliary cylinders mechanism 95 is formed with so-called single action cylinder type, and lift system 94 accepts a part for the supply of the pressure oil of lift cylinder outside figure and shortens (lower link, working rig rise) or bear working rig weight and extend (lower link, working rig decline).

As mentioned above, the lower end of auxiliary cylinders mechanism 95 links via side stringer board 83a (being left side in legend) the projecting supporting pin 96 from base component 83.Specifically, through hole is set in the lower side of stringer board 83a, insert supporting pin 96 large-diameter portion 96a side and with being welded and fixed.Be formed through the connect apertures of the lower end side of the cylinder portion 95a in auxiliary cylinders mechanism 95 and be linked to standard footpath portion 96b.Be configured to link 95a side, cylinder portion rotationally relative to fixing supporting pin 96 and the expanding-contracting action that can carry out auxiliary cylinders mechanism 95 by rotating.

In the below of cylinder portion 95a, utilize stringer board 83a that the protecting component 97 of Square consisting of two isosceles right-angled triangles is set.This protecting component 97 is possessing appropriate size up and down, even if lower link 7b, 7bA drop to lowermost position and put left and right also can be stoped to rock and enter immediately below auxiliary cylinders mechanism 95, can enter and vertical motion and cylinder portion 95a and lower link 7b, 7bA interfere and the situation of breakage prevents in the first place again because of unexpected.In addition, protecting component 97 is except above-mentioned Square consisting of two isosceles right-angled triangles, also can be the thread-like member in the vertical direction in suitable length, in a word, vibrate in the lateral direction as long as possess lower link 7b, 7bA of preventing lowermost position from putting and enter the structure in the acies portion of the below of cylinder portion 95a.In addition, in the above-described embodiments, this protecting component 97 utilizes the stringer board 83a of protecting component 83 to arrange, as long as but in tractor truck body side be connecting structure then rigging position where can.

Cylinder portion 95a suitably in auxiliary cylinders mechanism 95 from hydraulic valve forms hydraulic circuit, about this pipe arrangement 95c, arranges round from the outer hydraulic valve of figure on the top of the rear axle box 91 of the side (there is the side of auxiliary cylinders mechanism) of change speed gear box 12.If form like this, then do not need the rear portion of change speed gear box 12 and bottom roundabout, be difficult to become obstacle.In addition, if roundabout in opposite side rear axle box 91, then must carry out considering the design with the interference of the operating system connecting rod mechanism of scheming outer diff lockout mechanism etc., but by making both be in the state of dividing right and left, thus can not above-mentioned interference be produced.

About the holding structure of above-mentioned top connecting rod 7a, on the upper back of change speed gear box 12 or hydraulic fluid tank top, the valve group that configuring external hydraulic pressure takes out, but reinforcing frame parts 98 are set in the mode of surrounding these valve groups, at these reinforcing frame parts 98, top connecting rod rest 99 is set.Therefore be the structure of the top connecting rod 7a keeping operation pusher side non-link state with vertical posture.The hook portion of this top connecting rod rest 99 is made up of elastomeric element, is the middle part of engaging top connecting rod 7a and the structure that can keep.In addition, by utilizing the additional structure in the coating of this hook portion or the mechanism of pasting resin material, realize preventing damage.

In above-mentioned Figure 13 ~ Figure 15, if the structure that front-wheel axle housing 66 is supported in abutment bracket 67 is described to via support cylindrical shell 69F, 69R, then lower frame 100F, 100R are set in order to link framework 67L, 67R of the left and right of separation before and after the lower surface of abutment bracket 67, in these lower the upper assembling of portion's framework 100F, 100R via above-mentioned support cylindrical shell 69F, 69R around axle center, front and back rotatably front-wheel axle housing 66.

After the left and right central authorities of front-wheel axle housing 66, and link the input part metal piece 102 being formed with a pair diff metal piece 102a, the 102a that can assemble front wheel differential gear mechanism 101 in advance and the power steering cylinder 103 carrying out manipulating interlock to left and right front-wheel 2,2 at support cylindrical shell 69R.Namely, possess the fastening bolt closed the back face aperture portion of axle housing 66 in the peripheral outer lips of input part metal piece 102, wherein a part is the structure that can link with the installation portion 66a of the central upper being formed at axle housing 66 with standing shape.On the other hand, forming bolt link internal thread hole 103a in the front side of power steering cylinder 103, is the structure can tightened together with the peripheral outer lips of input part metal piece 102.Therefore, it is possible to power steering cylinder 103 is configured in the position on input part metal piece 102, effectively spatial portion can be utilized.

In addition, owing to the input part metal piece 102 of axle housing 66 can be tightened, therefore, it is possible to simplifying the structure mounting structure together with power steering cylinder 103.

In addition, following structure made by power steering cylinder 103, namely, possess the slide shaft 103c of stationary cylinder 103b and the left and right standing shape to this stationary cylinder 103b, each end side of slide shaft 103c links the revolution coupled arm (not shown) stretched out from the axis of revolution portion in the final drive portion supporting left and right front-wheel 2 in interlock mode.

Then, based on above-mentioned Figure 14,15 and Figure 22 ~ Figure 24, the revolution with this bearing circle 8 is operated, supply from control presssure oil to above-mentioned power steering cylinder 103 and discharge while be described the turning control cell that front-wheel 2,2 turns to.Following structure: by with the horizontally slip action of pressure oil to the slide shaft 103c of the supply of power steering cylinder 103 and discharge, via left and right pipe link 104,104, make this front-wheel manipulate case 105 from the manipulation arm 106,106 etc. that front-wheel manipulation case 105,105 is outstanding towards rear to manipulate interlock to the left and right around manipulation axle center, left and right front-wheel 2,2 is turned to any direction.

Be following structure, namely, by the part of structure forming turning control cell turn to that switching control valve 110 is detachably fixed in above-mentioned change speed gear box 12, the upper surface of front gear box 12F.Namely the upper surface, by valve casing 111 being detachably fixed on front gear box 12F is anterior, and is fixed on the anterior 12Fa formed higher with crowned.The U-shaped framework that this valve casing 111 is formed in bending suitably implements brace panel, makes that left and right foot 111b, 111b lower end abuts with the upper surface of front gear box 12F and bolt is fixed.This upper surface is formed as retreating rake 111a, utilizes this rake 111a and turns to switching control valve 110 in the installation of its lower face side.This turn to switching control valve 110 to possess to accept supply from the pressure oil of gear type pump 70 mouth, towards two supply ports of the above-mentioned power steering cylinder 103 of double action type and vessel port, and, under the state of through above-mentioned rake 111a, steering shaft 112 is arranged to the projected state vertical with this rake 111a.In order to above-mentioned bearing circle 11 interlock, the lower end of the tween drive shaft 113 being fitted together to link relative to its hub portion is linked to this steering shaft 112 via universal coupling 114.Specifically, be fitted together to universal coupling axle 114a at steering shaft 112 upper spline or serration and fix with the locking of the state of restrictive axes direction movement.In tween drive shaft 113 side of the opposing party, similarly spline or serration are fitted together to universal coupling axle 114b.

Therefore, it is following structure, namely, steering shaft 112 accepts the left-right rotary of bearing circle 11 then rotates, control to turn to the Vavle switching of the inside of switching control valve 110, the pressure oil supplied suitably is supplied to either party side, left and right of the piston in power steering cylinder 103 or the opposing party side and direction action that slide shaft 103c is specified to the left and right by gear type pump 70.In addition, tween drive shaft 113 is fixed on steering handwheel column 113b via steering column 113a, but these steering columns 113a and steering handwheel column 113b is arranged to tilt forward and back free adjustment relative to manipulation sheet frame 115, the structure of so-called roll steer dish can be realized with the mutually auxiliary ground of the link of above-mentioned universal coupling 114.

Structure near above-mentioned valve casing 111 is described in detail.Assembling integratedly arrange can support operation person sole chassis 116, cover the left and right of the upper surface of trailing wheel 3,3 mud guard 117,117, from the front end of chassis 116 upward next door shape front panel 118 and carry out supporting fixing front strut 119 etc. to above-mentioned manipulation sheet frame 115, form the auxiliary assembling of carrying framework 120.

The front panel 118 of the lift-launch framework 120 of this auxiliary assembling is bent to form in the mode presenting recess space 118a in front side, just in time makes bolted in the above-mentioned valve casing 111 of the upper surface of front gear box 12F and turns to switching control valve 110 to be positioned at this this recess space 118a.In addition, steering shaft 112 or the through front panel 118 of universal coupling 114 also extend upward.

Above-mentioned lift-launch framework 120 is following structures, namely, on fixing with bolt tightening with the standing shape to the left and right front side substrate 121,121 of the sidewall from front gear box 12F, load via vibration-proof rubber vibrationproof the front portion mounting frame 122,122 supporting and be arranged on about the lower front of this lift-launch framework 120.And be following structure, namely about the back lower carrying framework 120, be provided with rear portion mounting frame 123,123, be arranged at the backside substrate 124,124 of upper surface of above-mentioned rear axle box 91,91, loading support these rear portions mounting frame 123,123 via vibration-proof rubber vibrationproof.

As mentioned above, owing to being by valve casing 111 and turning to switching control valve 110 to be directly assemblied in the structure of the upper surface of front gear box 12F, namely fix tween drive shaft 113 side by steering handwheel column 113b, steering shaft 112 is fixed on front gear box 12F via above-mentioned valve casing 111, and the structure of diaxon 112,113 is connected with universal coupling 114, therefore with turning to the vibration of valve 110 main body of the flowing of the pressure oil in switching control valve 110 to be difficult to, along tween drive shaft 113 arrival direction dish 11, can not steer ability be damaged.

The lift-launch framework 120 of legend is ROPS (Roll-Over Protective Structure) pattern, but also can be operator's compartment pattern.

Claims (4)

1. a working truck, be configured to by with the horizontally slip action of pressure oil to the slide shaft (103c) of the supply of power steering cylinder (103) and discharge, via left and right pipe link (104,104), make this front-wheel manipulate case (105) around manipulation left and right, axle center interlock from the outstanding manipulation arm (106,106) of front-wheel manipulation case (105,105), thus left and right front-wheel (2,2) is turned to

The feature of above-mentioned working truck is,

Control presssure oil is fixed on the upper surface of change speed gear box (12) to the supply of above-mentioned power steering cylinder (103) and the switching control valve (110) that turns to of discharge.

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

Make following structure: install at the lower surface of the rake (111a) being formed at valve casing (111) and turn to switching control valve (110), this valve casing (111) is fixed on the upper surface of change speed gear box (12).

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

From turning to the steering shaft (112) that switching control valve (110) is outstanding upward, will be attached on the tween drive shaft (113) with bearing circle (11) interlock via universal coupling (114).

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

Possesses the front panel (118) of the posture that the front of taking the chassis (116) of the sole of the operator in driver's seat (8) from support erects upward, form recess space (118a) in the front side of above-mentioned front panel (118), make above-mentioned valve casing (111) and turn to switching control valve (110) to be positioned at this recess space (118a).