CN1283486C - Harvester - Google Patents

Abstract

Provided is a transmission structure for a combine harvester infinitely varying the speed of a reaping part without causing an increase in size of the transmission structure. The transmission structure is designed to independently drive a left and a right crawler apparatuses 1 with a pair of hydraulic infinitely variable gears 21 and 22 and drive a reaping operation part 3 with a hydraulic infinitely variable gear 23.

Description

Reaper

Technical field

The present invention relates to a kind of reapers such as combination machine that harvesting homework department is arranged that on the body of right-hand track chiain running gear traveling that keeps left, link, more particularly, relate to drive mechanism this reaper, that be input to the engine power in the change speed gear box.

Background technology

In recent years, be in the reaper of representative with the combination machine, the Hyaulic infinite variable speed mechanisms (HST) with excellent operability that adopt are put with the main transformer quick-mounting as traveling more, for example disclosed as TOHKEMY 2002-104229 communique, the reaper of following formation is known, promptly, be connected by engine-driven continuously variable unit and change speed gear box, make variable-speed dynamic in change speed gear box, be shunted to walking system and operating system from continuously variable unit, when the walking system power after the shunt is carried out passing to left and right sides crawler belt running gear along separate routes after the multi-change speed with the secondary speed-changing mechanism of gear type, the operating system power after the shunt is passed to harvesting homework department via the PTO axle that is had in the change speed gear box.

In addition, the somebody proposes such formation scheme, that is, adopt Hyaulic infinite variable speed mechanism to put with the main transformer quick-mounting as traveling, and, with driving band type continuously variable unit harvesting homework department is independently driven with the binding of driving engine interlock.

According to the former formation, walking system and operating system are to be driven by common continuously variable unit, thereby can therefore, have the stable advantage of upright posture of harvesting fringe bar that time with the speed drive harvesting homework department synchronous with traveling speed.But, when operation is carried out on low speed traveling limit, limit, the actuating speed of harvesting homework department is corresponding reduction, is easy to generate that to cause gathering in the moving velocity of the support pawl that performance reduces, helps device slack-off and the fringe bar such as is uprooped at bad phenomenon such as the speed of the cutter of reaping apparatus is slack-off.And during operation traveling at full throttle, the actuating speed of harvesting homework department will correspondingly improve, and each operating member that occurs harvesting homework department easily weares and teares easily and is easy to generate bad phenomenon such as driving noise.

And according to the latter's formation, harvesting homework department is by driving band type continuously variable unit individual drive, therefore, can avoid the generation of the above-mentioned bad phenomenon that arrives seen in the former prior art.But this formation will cause driving band type continuously variable unit own vol bigger.And this driving band type continuously variable unit will dispose in addition with respect to walking system, therefore, exists the bigger problem of whole drive mechanism volume.In addition, for the driving band type continuously variable unit, take measures and frequently safeguard at problems such as heating, driving band wearing and tearing.

And, also exist following problem.It is disclosed for example to open flat 11-28944 communique as the spy, and in large-scale combination machine, the structure that left and right sides crawler belt running gear is independently driven by Hyaulic infinite variable speed mechanism respectively is practicability.

Bringing into play though above-mentioned drive configuration can make left and right sides crawler belt running gear produce velocity contrast can any rotating performance, when directly advancing, might there are differences etc. former because of the performance of pump in each continuously variable unit and motor thereby causes rectilinear propagation to reduce.

In addition, as the means of eliminating above-mentioned bad phenomenon, someone proposes a kind of like this scheme, promptly, introduce between the left and right sides traveling drive system can between the free state that makes two driving systems link the all-in-one-piece lock-out states and two driving systems are separated fully, switch directly advance power-transfer clutch, to directly advance power-transfer clutch when directly advancing traveling and switch to lock-out state, and revolution will directly be advanced power-transfer clutch during traveling and be switched to free state, but this scheme exists when directly advancing clutch on-off, engages suddenly because of left and right sides traveling drive system easily or separate to produce the transmission impact.

The present invention is conceived to above problem and proposes, and its main purpose is, provide a kind of have can either make the reaping part stepless change can avoid or alleviate the drive mechanism reaper of the above-mentioned bad phenomenon that arrives seen in the prior art again.

In addition, another purpose of the present invention is, in such reaper, directly advances power-transfer clutch by introducing, and not only can directly advance traveling reliably and can alleviate the clutch of following directly to advance power-transfer clutch and the transmission that produces impacted.

Summary of the invention

For achieving the above object, reaper according to the present invention belongs to a kind of reaper that harvesting homework department is arranged that links on the body of right-hand track chiain running gear traveling that keeps left, said left and right sides crawler belt running gear can be driven with continuously variable unit by the fluid pressure type traveling, it is characterized in that, said harvesting homework department can by be provided with in addition with continuously variable unit with respect to said traveling, the fluid pressure type operation drives with continuously variable unit.

According to above-mentioned formation, can be by driving homework department with other continuously variable unit with respect to the crawler belt running gear, therefore, for example during the operation traveling under carrying out extremely low speed, can be with the speed drive reaping part that is unlikely to make the harvesting performance reduce, help device that the fringe bar is uprooped.And in common operating speed field during the operation traveling, by with the speed drive reaping part synchronous with traveling speed, the fringe bar is helped attitude stabilization in the time of can making harvesting.In addition, when operation traveling at full throttle,, not only can alleviate the wearing and tearing of the exercises portion of reaping part, and can prevent to drive the generation of noise by with the low speed drive reaping part of the speed more synchronous than traveling speed.

In addition, the structure of Hyaulic infinite variable speed mechanism is to drive varying capacity formula Hydraulic Pump with engine power, makes HM Hydraulic Motor to rotate with the corresponding speed of the pressure oil delivery volume of this Hydraulic Pump, takes out variable-speed dynamic from this hydraulic motor output shaft.Therefore, the axle base of the input shaft of continuously variable unit (pump shaft) and output shaft (motor drive shaft), with make accept driving pulley that engine power uses and output with at least one side's of driven pulley belt conveyor effectively around hang diameter variable and with belt conveyor around hanging between two belt pulleys and the axle base of the input and output shaft of the conveyor type continuously variable unit of formation is compared little.In addition, the heating in the Hyaulic infinite variable speed mechanism can be eliminated by oil radiator being arranged on the appropriate location in the hydraulic circuit, and must safeguard for parts wear hardly.

Therefore, according to the present invention, can drive reaping part and irrelevant with proper speed with traveling speed, and because the continuously variable unit that reaping part is independently carried out speed change is a hydraulic transmission, compare more compactly with conveyor type, and have excellent durability and maintainability.

Have again, if about said crawler belt running gear can drive independently of each other by a pair of continuously variable unit respectively, then have the following advantages.

According to above-mentioned formation, by when equidirectional drives the left and right sides crawler belt running gear, making their speed difference, just can make body carry out turning round accordingly, and just can carry out revolution such as cast action by the driving direction difference that makes left and right sides crawler belt running gear with this velocity contrast.

Therefore, can freely handle body and carry out various forms of revolutions, improve performance of running stability effectively.

Have again, if also be provided with change speed gear box to said crawler belt running gear transferring power, said traveling continuously variable unit and operation continuously variable unit are installed on this change speed gear box, and in said change speed gear box, the power that is input to the driving engine in this change speed gear box is transmitted with continuously variable unit with continuously variable unit and operation along separate routes and to said traveling, then have the following advantages.

According to above-mentioned formation, change speed gear box can be used as reaping part drive usefulness continuously variable unit supporting structure and the power of driving engine played a role to the distribution box of two continuously variable unit distribution and transmission.

Therefore, can effectively utilize change speed gear box, walking system and operating system continuously variable unit are set compactly, effectively realize the miniaturization of drive configuration.

If said change speed gear box has the 1st horizontal side and the 2nd horizontal side on reciprocal side, the said framework that gathers in homework department is provided on the said the 1st horizontal side, said traveling is provided on the said the 2nd horizontal side with continuously variable unit with continuously variable unit and operation, then the continuously variable unit of the said continuously variable unit of walking system and operating system is positioned at and is not subjected to gather on that homework department hinders, the position that be easier to observe, that hand touches easily, is convenient to continuously variable unit is safeguarded.

As another feature structure, the said said crawler belt running gear ground that gathers in about homework department can be independent of with continuously variable unit by said operation drives, and, when even the actuating speed of said crawler belt running gear is zero velocity, said actuating speed of gathering in homework department also can be set at carries out on the needed MIN speed of fringe bar harvesting operation, thereby has the following advantages.After setting like this, the actuating speed of harvesting homework department is not the speed synchronous with traveling speed, is zero velocity, but carries out the needed MIN speed of steady bar harvesting operation.This speed is meant, can guarantee that the moving velocity of the support pawl of a plurality of support devices, the knife speed of reaping apparatus and the speed of fringe bar feedway fringe bar after the conveyer chain (feedchain) of sheller unit is carried harvesting all reach bottom line or higher speed.Therefore, even when for example traveling speed is zero velocity, the various performances that also can guarantee above-mentioned parts obtain performance, thereby can prevent that the knife speed of reaping apparatus is slack-off and cause gathering in the slack-off and generation of the fringe bar being uprooped etc. bad phenomenon of the moving velocity of the support pawl that performance reduces, helps device.

If again to the actuating speed capping value of said harvesting homework department, improve then better again even make the actuating speed of left and right sides crawler belt running gear reach also can to limit its actuating speed more than the certain speed.The capping value has the following advantages as described above, that is, can prevent or alleviate the wearing and tearing of exercises portion that produce because of the actuating speed surplus, harvesting homework department and drive noise.

Have again, if between the power drive system that the power said crawler belt running gear to the left and right of said driving engine in said change speed gear box along separate routes transmits respectively, be equipped with can two driving systems are linked the all-in-one-piece lock-out states, with the free state that two driving systems are separated fully between the friction-type that switches directly advance power-transfer clutch, and, this directly advances to have in the power-transfer clutch power transmission that makes under the low torque becomes possible precompressed mechanism, then has the following advantages.

According to above-mentioned formation, when directly advancing traveling, directly advance clutch engagement, be in left and right sides traveling is linked the all-in-one-piece lock-out state with driving system, eliminate output speed poor of left and right sides continuously variable unit, with identical speed drive left and right sides crawler belt running gear.And when the revolution operation that the output speed that makes left and right sides continuously variable unit there are differences, directly advance disengaging of clutch, be in the free state that two driving systems are separated fully, with with the corresponding speed drive of the output speed of each continuously variable unit left and right sides crawler belt running gear, drive the body revolution.

Here, switch to released state from engagement state and when straight moving condition switches to turn state and will directly advancing power-transfer clutch, switch to engagement state and when turn state switches to straight moving condition will directly advancing power-transfer clutch from released state, the process that will all be disengaged through the joint of forcing to make power-transfer clutch and the state that separates, promptly directly advance power-transfer clutch carries out the low torque frictional transmission under the effect of precompressed mechanism process, therefore, the switching of successfully walking row mode under the less situation can impacted.

Therefore, directly advance power-transfer clutch, not only can directly advance traveling reliably by introducing, and, the clutch of following directly to advance power-transfer clutch can be alleviated and the transmission that produces impact.

These precompressed means for example can be pushed and be made this directly advance the spring that power-transfer clutch is in slight engagement state and constitute by, the friction lining that said friction-type is directly advanced power-transfer clutch.

Read following explanation by the reference accompanying drawing, just can understand further feature constitutes and further feature constitutes effect and effect and advantage.

Description of drawings

Fig. 1 is the automatic threshing type combination machine of conduct reaper one example according to an embodiment of the present invention, sees the unitary side view of past tense from the body left side.

Fig. 2 is the front elevation that roughly constitutes of showing drive mechanism.

Fig. 3 is the vertical profile front view of change speed gear box.

Fig. 4 is the vertical profile front view that directly advances the power-transfer clutch peripheral part.

Fig. 5 is lateral plan configuration state, see past tense from the body left side of showing the axle of change speed gear box.

Fig. 6 is hydraulic circuit figure.

Fig. 7 is secondary speed-changing mechanism and the operation hydraulic circuit figure that directly advances power-transfer clutch.

Fig. 8 is a block diagram of showing the operating structure of operating system continuously variable unit.

Fig. 9 is a performance diagram of showing the system of closing between traveling speed and the harvesting homework department actuating speed.

Figure 10 is the front elevation of running gear portion.

The specific embodiment

Below, with reference to accompanying drawing,, describe in conjunction with combination machine as an example of reaper to the present invention's one preferred implementation.

Fig. 1 illustrates the whole side of automatic threshing type combination machine involved in the present invention.The basic comprising of this combination machine compared with prior art there is no special change, it constitutes, the front portion of the traveling body 2 of the crawler belt running gear 1 about having, linking has by driving the harvesting homework department 3 of liftable multiple row harvesting specification, and, on the anterior right side of traveling body 2, be provided with the manoeuvre portion 6 that driving engine 5 (Fig. 2) is installed below driver's seat 4.In addition, in the upper left-hand of traveling body 2 sheller unit 7 is installed, and disposes grain reclaim tank 9 with spiral unloader (unloader) 8 on its right side.

Said harvesting homework department 3 can be equipped with a plurality of support devices 11, reaping apparatus 12 around fulcrum X easy on and off shaking bearing, harvested fringe bar is being transported to fringe bar feedway 14 on the conveyer chain (feed chain) 13 of sheller unit 7 etc. on the harvesting homework department framework 10 on the front portion of traveling body 2, harvesting homework department 3 integral body can lifting under the driving of hydraulic actuating cylinder 15.

Feature formation of the present invention is to said crawler belt running gear 1 and gathers in the drive mechanism that homework department 3 carries out transmission.In the following description, with just in change speed gear box 20, making the power shunt that is input to the driving engine in this change speed gear box 20 especially, each power after the shunt is elaborated with structure or the formation that continuously variable unit 23 transmits with continuously variable unit 21,22 and operation to traveling.

Fig. 2 is drive mechanism is seen past tense from the body front a formation scheme drawing, and Fig. 3 is the vertical profile front view of change speed gear box 20.In these figure, (for body is right horizontal side in a horizontal side of change speed gear box 20, be equivalent to the 2nd horizontal side) on be equipped with: to about a pair of Hyaulic infinite variable speed mechanism that independently drives of crawler belt running gear 1 (HST, traveling with one of continuously variable unit example) 21,22; And to gathering in the Hyaulic infinite variable speed mechanism (HST, operation one of continuously variable unit example) 23 that homework department 3 drives.In addition, (for body is left horizontal side, and the side with harvesting homework department framework 10 that shows among Fig. 1 is equivalent to the 1st horizontal side) is extruded with input shaft 24 from another side of change speed gear box 20, and this input shaft 24 is by driving band and driving engine 5 interlocks.

In addition, the vertical profile front view that Fig. 4 is in the said change speed gear box 20, aftermentioned is directly advanced power-transfer clutch 50 peripheral parts, Fig. 5 is that the configuration state of each is seen lateral plan in the past from the body left side in the said change speed gear box 20.

With reference to above-mentioned Fig. 2～5, each continuously variable unit 21,22,23 constitutes like this, promptly, on the right side wall of change speed gear box 20, be integral with it respectively in the outstanding case shell portion that is provided with, axial plunger (axial plunger) formula varying capacity pump P (1), P (2), P (3) and constant volume amount motor M (1), M (2), M (3) are housed, and end block 21c, 22c, the 23c that fluid control is used is installed in the housing outer end.Be input to the power on the input shaft 24 from driving engine 5, be delivered on each pump shaft 21a, 22a of walking system continuously variable unit 21,22 via gear G2, G3 from counting gear G1, simultaneously, be delivered on the pump shaft 23a of operating system continuously variable unit 23 via gear G4.And, change the outbound course and the output of pressure oil by the rotating wobble plate angle (swash plate angle) of each varying capacity pump P (1) of independent change, P (2), P (3), can realize positive anti-switching each motor drive shaft 21b, 22b, 23b, hand of rotation and the stepless change that begins from zero-speed.That is to say that left track running gear 1 can drive independently of one another with harvesting homework department 3 with right side crawler belt running gear 1 and constitute.

And, after being delivered on the 1st tween drive shaft (left side) 26 from the speed change output of the motor drive shaft 21b of continuously variable unit 21 via the secondary speed-changing mechanism of gear type (left side) 25, via being nested on the 2nd tween drive shaft 27 and supported gear reduction 28 is delivered on the axletree (left side) 29, thereby drive left track running gear 1 with vacillating.And after being delivered on the 1st tween drive shaft (right side) 31 from the speed change output of the motor drive shaft 22b of continuously variable unit 22 via the secondary speed-changing mechanism of gear type (right side) 30, via being nested on the 2nd tween drive shaft 27 and supported gear reduction 32 is delivered on the axletree (right side) 33, thereby drive right side crawler belt running gear 1 with vacillating.

Said secondary speed-changing mechanism (left side) 25 constitutes like this, promptly, have the big miniature gears G5, the G6 that drive by motor drive shaft 21b, can be nested on the 1st tween drive shaft (left side) 26 with vacillating and with a pair of gear G7, the G8 of said gear G5, G6 interlock, the driving center 35 that between two gear G7, G8, links by spline (spline) and the 1st tween drive shaft (left side) 26, and be embedded in sliding sleeve 36 on the driving center 35 outward by spline; And, can realize two grades of speed changes of height with constant-mesh (constant mesh) form.In this formation, make it across driving center 35 interlock by moving sliding sleeve 36 with the hub portion of gear G8, can obtain " low speed ", moving sliding sleeve 36 makes it across driving center 35 interlock with the hub portion of gear G7, can obtain " at a high speed ",, then can obtain " neutrality " state if thereby sliding sleeve 36 is positioned on the driving center 35 interlock of removing with the hub portion of two gear G7, G8.

Said secondary speed-changing mechanism (right side) 30 too, constitute with the specification identical with said secondary speed-changing mechanism (left side) 25, comprise the big miniature gears G9, the G10 that drive by motor drive shaft 22b, can be nested on the 1st tween drive shaft (right side) 31 with vacillating and with a pair of gear G11, the G12 of said gear G9, G10 interlock, at the driving center 37 that is attached at by spline between two gear G11, the G12 on the 1st tween drive shaft (right side) 31, and be embedded in sliding sleeve 38 on the driving center 37 outward by spline; Make it across driving center 37 interlock by moving sliding sleeve 38 with the hub portion of gear G12, can obtain " low speed ", moving sliding sleeve 38 makes it across driving center 37 interlock with the hub portion of gear G11, can obtain " at a high speed ",, then can obtain " neutrality " state if thereby sliding sleeve 38 is positioned on the driving center 37 interlock of removing with the hub portion of two gear G11, G12.

In addition, as shown in Figure 4, the a pair of displacement shift fork 40,41 that fastens with each sliding sleeves 36,38 of two secondary speed-changing mechanisms 25,30 is attached at and obtains change speed gear box 20 supportings and on can the common variable shaft 42 of sway, and can move under the driving of the variable speed operation hydraulic actuating cylinder 43 in being assembled in change speed gear box 20 and constitute with variable shaft 42; Make it by drive variable shafts 42 with variable speed operation hydraulic actuating cylinder 43 that electing property moves between 3 positions, two secondary speed-changing mechanisms 25,30 can be switched to simultaneously on " low speed " that the operation traveling uses, " at a high speed " or " neutrality " position that mobile traveling is used.

In addition, as shown in Figure 4, be designed to, displacement s1, the s2 of each sliding sleeve 36,38 of two secondary speed-changing mechanisms 25,30 when " low speed " switches to " at a high speed ", and the displacement (not shown) when " at a high speed " switches to " low speed " has small difference respectively, makes the speed change sequential difference of two secondary speed-changing mechanisms 25,30.Like this, can avoid causing that because of the deviation of mesh phase in two secondary speed-changing mechanisms 25,30 change action is bad, make left and right sides traveling drive system speed change successfully.

In said variable speed operation hydraulic actuating cylinder 43, be assembled with the piston rod 44 that is attached on the variable shaft 42 and be embedded in outward on this piston rod 44 and supported annular piston 45, by the pressure oil supply model is controlled, piston rod is advanced and retreat between " at a high speed ", " low speed " and " neutrality " three positions.

Promptly, as shown in Figure 7, the pair of switches valve 46 of variable speed operation hydraulic actuating cylinder 43 and Electromagnetic Drive, 47 connect and are communicated with, shown in Fig. 7 (a), when being in two switch valves 46,47 all during the state of energization excitation, two switch valves 46,47 open, pressure is applied to two pressure oil port a of variable speed operation hydraulic actuating cylinder 43 simultaneously, on the b, piston rod 44 is under the effect from the pressure of pressure oil port a, left in figure is retracted into, simultaneously, annular piston 45 is under the effect from the pressure of pressure oil port b, move to the limit place right-hand among the figure, because of the compression area difference, piston rod 44 will remain on because of annular piston 45 and move on the center position that has been restricted always.In addition, shown in Fig. 7 (b), when having only switch valve 47 energization excitations, under effect from the pressure of pressure oil port b, piston rod 44 and annular piston 45 move to the limit place right-hand among the figure always, and piston rod 44 enters on " low speed " position that the operation traveling uses always.In addition, shown in Fig. 7 (c), when having only switch valve 46 energization excitations, under effect from the pressure of pressure oil port a, piston rod 44 and annular piston 45 move to the limit place of left among the figure always, and piston rod 44 returns on " at a high speed " position that mobile traveling uses always.

In addition, the 1st tween drive shaft (left side) 26 crossbearers are between the sidewall of the left and right sides of change speed gear box 20, and with respect to this, the 1st tween drive shaft (right side) the 31st can be nested on the 1st tween drive shaft (left side) 26 and supported with vacillating, and, between the 1st tween drive shaft (left side) 26 and the 1st tween drive shaft (right side) 31, the multiple-piece that intermediary has depended on pressure oil to operate directly advances power-transfer clutch 50.Directly advance power-transfer clutch 50 as this, when left traveling all is subjected to the operation of same directional same operation amount with continuously variable unit 21 and right traveling with continuously variable unit 22, promptly, when being in the state that directly advances operation, clutch engagement, the 1st tween drive shaft (left side) 26 and the 1st tween drive shaft (right side) 31 are become one, even how many output speeds of two continuously variable units 21,22 exists some differences, axletree (left side) 29 with axletree (right side) thus 33 drivings that also can be subjected to identical speed reach straight moving condition conscientiously.And to left traveling with continuously variable unit 21 and right traveling with the operation of continuously variable unit 22 when inequality, promptly, when being in the state that carries out the body steering operation, can with the steering operation action of directly advancing power-transfer clutch 50 of control linkedly mutually, make and directly advance power-transfer clutch 50 and cut off.

As shown in Figure 4, directly advancing power-transfer clutch 50 constitutes like this, promptly, be fixed on major diameter drum 51 on the 1st tween drive shaft (left side) 26, and be fixed on that there is friction lining 53 in intermediary between the minor diameter drum 52 on the end of the 1st tween drive shaft (right side) 31, and, by moving to positive dirction or reversing sense under the effect that makes piston piece 54 pressure oil that oil circuit c, d supply with in by axle that is assembled between the 1st tween drive shaft (left side) 26 and the major diameter drum 51, can realize the clutch of power-transfer clutch; The oil circuit c that the actuating clutch engagement is used is connected with electromagnetic switch valve 56,57 (with reference to Fig. 7) via the rotary connector 55 that is installed in axle head with the oil circuit d that the actuating power-transfer clutch cuts off usefulness.

In addition, end at the 1st tween drive shaft (left side) 26 is equipped with internal expanding drg 58, and is assembled with piston piece 54 pushed in directly advancing power-transfer clutch 50 and makes it to trend towards the multi-disc annual spring 59 (one of precompressed mechanism example) that the direction to clutch engagement moves.In being in said oil circuit c, d all not during the state of build-up pressure, said friction lining 53 is subjected to the elasticity pushing of spring 59 and makes and directly advance the state that power-transfer clutch 50 is in slight joint.

Therefore, switching to turn state from straight moving condition, perhaps when turn state returns to straight moving condition, by making two oil circuit c, d only be in the not state of build-up pressure in the short time at the utmost point, left and right sides axletree 29,33 is in by directly advancing the slight states that engage of power-transfer clutch 50, alleviates the impact when beginning to turn round and return to impact when directly advancing from revolution.

In addition, when parking, kill engine 5 and the drg 58 that closes, and under driving engine 5 closing state, oil circuit c, can't build-up pressure among the d, thereby piston piece 54 will be in free state and make that directly advancing power-transfer clutch 50 is in the state of cutting off, drg 58 only works to the 1st tween drive shaft (left side) 26 and has only left track running gear 1 to be braked, but, as mentioned above, be to be in appropriate frictional transmission state between the 1st tween drive shaft (left side) 26 and the 1st tween drive shaft (right side) 31 by spring 59, therefore, the brake action that acts on the 1st tween drive shaft (left side) 26 also will act on the 1st tween drive shaft (right side) 31 to a certain extent, even park on the sloping floor, also can avoid right side crawler belt running gear 1 to be in free state and will cause body to turn to voluntarily under the deadweight effect.

In addition, shown in Fig. 2,3, the operation that is delivered to the left horizontal side that is arranged on change speed gear box 20 highlightedly via gear G12, G13 from the speed change output of the motor drive shaft 23b of the aforementioned continuously variable unit 23 of operating system is transmitted to harvesting homework department 3 via not shown tension type harvesting power-transfer clutch with on the output shaft (PTO axle) 60 again.Wherein, as shown in Figure 5, walking system continuously variable unit the 21, the 22nd, its pump shaft 21a, 22a and motor drive shaft 21b, 22b arrange along fore-and-aft direction with the longitudinal attitude of arranging up and down, and with respect to this, the continuously variable unit 23 of operating system is that its pump shaft 23a and motor drive shaft 23b are that change speed gear box 20 integral body that these three continuously variable units 21,22,23 have been installed reduce at height up and down with substantially level (motor drive shaft 23b is slightly by the top in this example) the lateral attitude configuration of arranging on fore-and-aft direction.Its result, the whole height of change speed gear box 20 is minimized, above change speed gear box 20, form excess room, because the existence of this excess room, the top that can avoid change speed gear box 20 and the manoeuvre portion 6 that is arranged in its top produce interferes or the harvesting fringe bar transport path of the top of change speed gear box 20 and harvesting homework department 3 produces and interferes.

Fig. 6 illustrates the hydraulic circuit relevant with said continuously variable unit 21,22,23.Each varying capacity pump P (1), P (2) to walking system continuously variable unit 21,22 carry out variable speed operation by the servo hydraulic cylinder of controlling by the action of servovalve 61,62 63,64.Wherein, two servovalves 61,62 be provided in the manoeuvre portion 6 can before and after the mono-main shift lever 65 (Fig. 1) that freely shakes, and can about set up such machinery between the mono-deflecting bar 66 (Fig. 1) that freely shakes and linked system, promptly, by main shift lever 65 is forwards operated from center position, can make two continuously variable units 21,22 varying capacity pump P (1), the equal forward direction of P (2) is subjected to the operation of same amount, and by main shift lever 65 is rearward operated from center position, can make two continuously variable units 21,22 varying capacity pump P (1), P (2) all is subjected to the operation of same amount to laggard direction, thereby speed change is advanced in the front and back can realize directly advancing the time.And, to do traveling and slow down along with deflecting bar 66 being operated to left from center position, can being made with continuously variable unit 21, body will be towards deflecting bar 66 by the direction of actuating, turn round with the revolute function with the operational ton degree of correspondence of bar.

For example, under the state that the speed that sets with main shift lever 65 is directly advanced to advance with deflecting bar 66 during to the left actuating, one side's continuously variable unit 21 slows down thereby the speed of advance of left track running gear 1 reduces, and body turns round to the left by means of left and right sides velocity contrast.And, when with deflecting bar 66 when left carries out bigger operation, that side's who is subjected to actuating and slows down continuously variable unit 21 will be in center position, be positioned at the inboard left track running gear 1 of revolution and will stop operating, thereby carry out turning short round (pivot turn).And when further with deflecting bar 66 when left carries out bigger operation, one side's continuously variable unit 21 will surmount center position and time zone speed change backward always, make to be positioned at the inboard left track running gear 1 of revolution to rotating, thereby surpass turning short round (spin turn) with the direction of the direction of rotation of the right side crawler belt that is positioned at the revolution outside.

As shown in Figure 8, the varying capacity pump P (3) that is responsible for the continuously variable unit 23 of driving harvesting homework department 3 is operated by actrs such as electro-motor 71.The actuating position of main shift lever 65 is detected by potential difference meter 72.

According to this testing result, set the pass system between traveling speed and the harvesting homework department actuating speed for for example characteristic shown in the image pattern 9, linkedly operating system continuously variable unit 23 is carried out the automatic speed changing operation mutually with the variable speed operation that advances of main shift lever 65.

At first, even when the actuating speed of left and right sides crawler belt running gear 1,1 is zero velocity, the actuating speed of harvesting homework department 3 be not yet with the synchronous speed of traveling speed be zero velocity, and be set to carrying out the needed MIN speed of fringe bar harvesting operation.This speed is that the moving velocity that can guarantee the support pawl of a plurality of support devices 11, the knife speed and the fringe bar feedway 14 of reaping apparatus 12 are carried the speed of harvesting back fringe bar all to reach bottom line or higher speed to the conveyer chain (feed chain) 13 of sheller unit 7, thereby be to guarantee that the various performances of above-mentioned parts all can access the speed of performance.Thus, can prevent that the knife speed of reaping apparatus is slack-off and cause gathering in the slack-off and generation of the fringe bar being uprooped etc. bad phenomenon of the moving velocity of the support pawl that performance reduces, helps device.

In addition, the actuating speed of harvesting homework department 3 has been set higher limit, even the actuating speed of left and right sides crawler belt running gear 1,1 reaches and also can limit its speed more than the certain speed and improve.This higher limit be according to type with the wearing and tearing of the exercises portion that can effectively reduce harvesting homework department, reduce to drive noise be that purpose is set.

In addition,, can think,, be advisable with convex characteristic shown in Figure 9 from realizing the fairness of harvesting operation about the characteristic between lower limit actuating speed and upper limit actuating speed of harvesting homework department 3.But characteristic shown in the accompanying drawing is example just eventually, by control setup (Fig. 8) can also be set at directly proportional or with Fig. 9 protruding downwards on the contrary mutually or the like various characteristics alternative it.

In addition, as shown in Figure 8, in the underfooting of manoeuvre portion 6, be provided with the stretcher 73 of trampling usefulness, when switch 74 detected this stretcher 73 and depressed, actr 71 just was controlled, make it possible to traveling speed irrespectively, with predefined certain speed drive harvesting homework department 3.So, even locate, main shift lever 65 is operated and traveling is stopped or being changed into when laggard at ridge etc., by trampling stretcher 73, can and harvested fringe bar not carried not unrestrainedly with certain speed drive harvesting homework department 3 yet.

As shown in Figure 6, on the pump shaft 22a in side's continuously variable unit 22 of walking system, the oil feed pump CP (1) that supplies with the pressure oil of exerting pressure to oil feeding line e, the f of two continuously variable units 21,22 is installed, and, on the pump shaft 23a in operating system continuously variable unit 23, the exert pressure oil feed pump CP (2) of pressure oil to the oil feeding line g of continuously variable unit 23 only is installed.Wherein, from the pressure oil of oil feed pump CP (1) also will to be used for to walking system continuously variable unit 21,22 carry out the hydraulic circuit of variable speed operation, the hydraulic efficiency servo of promptly bearing load supplies with, therefore be designed to, the output of oil feed pump CP (1) is greater than oil feed pump CP (2), and, make the pressure of walking system oil feeding line e, f be higher than the pressure of operating system oil feeding line g by replenishing relief valve CR (1), CR (2).

In addition, the case shell inside of walking system continuously variable unit 21,22 is connected by pipe arrangement h in the housing and is communicated with, flow in the case shell of right side walking system continuously variable unit 22 via pipe arrangement h in the housing from the oil of releasing of left side walking system continuously variable unit 21 after, take out through outside draining pipe arrangement i, be recovered in the special-purpose power fluid fuel tank T through oil radiator OC.In addition, the oil of releasing of operating system continuously variable unit 23 also is recovered in the aforementioned power fluid fuel tank T via outside draining pipe arrangement j and oil radiator OC.

[other embodiment]

More than Shuo Ming embodiment is an example eventually, and the present invention can also be implemented by following form.

(1) end block 21c, the 22c of walking system continuously variable unit 21,22 is integrated, but simplified structure.In addition, can also all end block 21c, 22c, the 23c of walking system and operating system continuously variable unit 21,22,23 is integrated.

(2) be responsible for driving the continuously variable unit 23 that gathers in homework department 3 and also can constitute like this, that is, it can also be operated counter-rotating dead slow speed zone.Like this, when fringe bar transport path takes place to stop up after harvesting,, the fringe bar that blocks more deadly oppositely can be carried, be made that eliminating the operation of stopping up becomes simple by making the counter-rotating of feedway dead slow speed.

(3) also can constitute like this, that is, and the position of the variable shaft of two secondary speed-changing mechanisms 25,30 being operated by detections such as switches 42 or the piston rod 44 of variable speed operation hydraulic actuating cylinder 43.According to this formation, testing result can be shown with telltale etc., be used for discerning the variable speed control situation.

(4) also can be implemented, that is, make variable shaft 42 and secondary shifter bar mechanical type interlock that two secondary speed-changing mechanisms 25,30 are operated, thereby operating effort be carried out speed change artificially by such form.

Claims (7)

1. one kind links the reaper that harvesting homework department (3) are arranged on the body of the right-hand track chiain running gear that keeps left (1,1) traveling, and left and right sides crawler belt running gear (1,1) can be driven with continuously variable unit (21,22) by the fluid pressure type traveling, it is characterized in that,

Said harvesting homework department (3) can by be provided with in addition with continuously variable unit with respect to said traveling, the said crawler belt running gear (1,1) of fluid pressure type operation about being independent of with continuously variable unit (23) drive,

The actuating speed of said harvesting homework department (3) is set with higher limit, though about the actuating speed of said crawler belt running gear (1,1) reach that certain speed is above, the speedup of this harvesting homework department (3) also is restricted.

2. as the said reaper of claim 1, it is characterized in that when the actuating speed of said crawler belt running gear (1,1) was zero velocity, the actuating speed of said harvesting homework department (3) is set at carried out on the needed MIN speed of fringe bar harvesting operation.

3. as claim 1 or 2 said reapers, it is characterized in that,

About said crawler belt running gear (1,1) can drive independently of each other by a pair of continuously variable unit (21,22) respectively.

4. as claim 1 or 2 said reapers, it is characterized in that,

Also be provided with change speed gear box (20) to said crawler belt running gear (1,1) transferring power,

Said traveling continuously variable unit (21,22) and operation continuously variable unit (23) are installed on this change speed gear box (20), and,

In said change speed gear box (20), the power that is input to the driving engine in this change speed gear box is transmitted with continuously variable unit (23) with continuously variable unit (21,22) and operation along separate routes and to said traveling.

5. as the said reaper of claim 4, it is characterized in that,

Said change speed gear box (20) has the 1st horizontal side and the 2nd horizontal side on reciprocal side,

The framework (10) of said harvesting homework department (3) is provided on the said the 1st horizontal side, and said traveling is provided on the said the 2nd horizontal side with continuously variable unit (23) with continuously variable unit (21,22) and operation.

6. as the said reaper of claim 4, it is characterized in that,

Between the power drive system that the power said crawler belt running gear (1,1) to the left and right of the said driving engine of shunt transmits respectively in said change speed gear box (20), be equipped with the friction-type that can between the free state that two driving systems are linked the all-in-one-piece lock-out state and two driving systems are separated fully, switch and directly advance power-transfer clutch (50), and

This directly advances to have the power transmission that makes under the low torque in the power-transfer clutch (50) becomes possible precompressed mechanism (59).

7. as the said reaper of claim 6, it is characterized in that,

Said precompressed mechanism is pushed by the friction lining (53) that said friction-type is directly entered power-transfer clutch (50) and makes this directly advance the spring (59) that power-transfer clutch (50) is in slight engagement state and constitutes.

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