JP4257455B2 - Combine drive transmission - Google Patents

Description

The present invention relates to a traveling power transmission device for a combine that includes a differential mechanism and a double clutch, and that travels in a swingable manner, and more particularly, to a traveling power transmission device for a combine that allows a transmission case to be compactly configured. Is.

  2. Description of the Related Art A combined travel transmission device is known that includes a hydraulic clutch and a differential mechanism and that travels in a swingable manner. For example, the traveling transmission device of the mobile agricultural machine shown in Patent Document 1 includes a differential mechanism that performs differential transmission between the left and right differential shafts, and a clutch mechanism that adjusts the speed by applying a braking force to the differential case. The vehicle can be driven to turn.

However, since the above-mentioned traveling transmission device is provided with a differential mechanism, a clutch mechanism, and the like projecting from the side of the traveling transmission device, it causes an increase in the width direction dimension of the transmission device and cannot meet the demand for compactness. Contains the problem.
JP-A-4-103472

The problem to be solved is to obtain a combined traveling transmission device that can be compactly configured in the mission case .

The invention according to claim 1 includes an input shaft, a sub-transmission shaft, a counter shaft, a reduction shaft, a side clutch shaft, a double clutch shaft, a differential gear shaft, and left and right wheel shafts in a transmission case.
The input shaft receives prime mover power through a hydrostatic continuously variable transmission,
The sub-transmission shaft is provided with a slide gear whose position can be selected by manual operation, and the power of the input shaft is output to the counter shaft with a plurality of gear ratios.
The reduction shaft is provided with a reduction gear that outputs the transmission power of the counter shaft at a substantially central position while reducing the transmission power of the counter shaft at a predetermined transmission ratio.
The side clutch shaft includes a center gear that receives power from the reduction shaft , a small-diameter gear, and left and right side clutch gears that can be engaged and disengaged in the axial direction with respect to the center gear while dividing the transmission system into left and right. Mesh the left and right wheel gears with the left and right wheel shafts .
The dual clutch shaft is provided with a dual clutch mechanism and an output gear of a hydraulic pack configuration divided at both shaft ends, and the dual clutch mechanism is provided at a position opposite to the operation unit, and the dual clutch shaft It is made detachable in the axial direction, and between the output gear and the double clutch mechanism, a small-diameter linear gear and a large-diameter turning gear are arranged in this order as the input gear of each clutch of the dual clutch mechanism,
A small-diameter gear attached to the side clutch shaft is always meshed with the turning gear, and a center gear provided on the side clutch shaft is always meshed with the linear gear,
Left and right differential gears are pivotally supported on the differential gear shaft, a differential case for differentially moving the left and right differential gears is provided, and the output gear of the dual clutch shaft is meshed with the differential case gear provided on the side of the differential case Let
The left and right differential gears are meshed with left and right wheel gears pivotally supported on a wheel shaft.

The traveling power transmission device for a combine according to the present invention has the following effects.
During turning, the transmission system on the turning center side is disconnected by the side clutch gear, and the double clutch mechanism is hydraulically controlled to reduce the double clutch shaft steplessly. The differential case is decelerated in accordance with the deceleration control of the double clutch shaft, and the differential gear and wheel shaft on the corresponding side are differentially decelerated to enable turning traveling transmission.
The side clutch shaft is provided with a center gear and a small-diameter gear, the small-diameter gear is always meshed with the turning gear, and the center gear is always meshed with the straight-running gear, so that the traveling transmission can be made compact and accommodated. The mission case can be reduced in size and weight.
In addition, the double clutch mechanism is provided at a position opposite to the driving operation unit, and the double clutch mechanism is configured to be detachable in the axial direction of the double clutch shaft, thereby facilitating maintenance of the double clutch mechanism. it can.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a left side view of a combine equipped with the traveling transmission device of the present invention. In FIG. 1, the combine is composed of a working machine such as a cutting part a, a threshing part b, a storage part c, and a carry-out part d, left and right crawlers e and e for traveling, and a right side of the front part of the machine. A driving operation unit f and the like for operating traveling are provided. Near the lower center of the driving operation section f and between the left and right crawlers e and e, the traveling transmission device 1 of the present invention is provided, and the left and right crawlers e and e are driven by the power of a motor (not shown). .

  FIG. 2 is an enlarged left side view of the traveling transmission device, and FIG. 3 is an exploded cross-sectional view of a main part of the traveling transmission device. 2 and 3, the travel transmission device 1 includes an input shaft 2, an auxiliary transmission shaft 3, a counter shaft 4, a reduction shaft 5, a side clutch shaft 6, a double clutch shaft 7, A differential gear shaft 8, left and right wheel shafts 9, 9 and the like are provided.

  The input shaft 2 is an introduction portion that receives prime mover power via a hydrostatic continuously variable transmission (not shown). The sub-transmission shaft 3 includes a slide gear 3a whose position can be manually selected, and constitutes a sub-transmission mechanism that shifts and outputs the power of the input shaft 2 to the counter shaft 4 at a plurality of gear ratios (third speed in the figure). . The speed reduction shaft 5 includes a speed reduction gear 5a that outputs the power of the counter shaft 4 at a substantially central position while decelerating the transmission power of the counter shaft 4 at a predetermined transmission ratio. The side clutch shaft 6 includes a small gear 6b in addition to the center gear 6a that receives the power of the reduction shaft 5, and includes left and right side clutch gears 6c and 6c that can be engaged and disengaged in the axial direction while dividing the transmission system into left and right. Prepare.

The double clutch shaft 7 is provided with a double clutch mechanism 7a and an output gear 7b having a hydraulic pack configuration divided at both shaft ends, and a double clutch mechanism between the output gear 7b and the double clutch mechanism 7a. A small-diameter straight-traveling gear 7c and a large-diameter turning gear 7d are arranged in this order as input gears of the clutches 7a. The linear gear 7c and the turning gear 7d are always meshed with the center gear 6a and the small-diameter gear 6b of the side clutch shaft 6 in correspondence with each other. In this configuration, place the output gear 7b on the side of the driving operation unit f, it is less than the outer diameter d1 of the outer diameter d3 2 consecutive clutch mechanism 7a. Further, the outer diameter dimension of the rectilinear gear 7c is formed to the same outer diameter dimension d3 as that of the output gear 7b. The outer diameter dimension d2 of the turning gear 7d is formed to be equal to or smaller than the outer diameter dimension d1 of the double clutch mechanism 7a and larger than the outer diameter dimension d3 of the output gear 7b.

The differential gear shaft 8 supports sleeve-like left and right differential gears 8b and 8b that function as a differential shaft, and differentially makes the two differential at a central position sandwiched between the left and right differential gears 8b and 8b. The differential case 8c is provided with a differential case gear 8a to form a differential mechanism. The differential case gear 8a is disposed on the side portion of the differential case 8c and meshes with the output gear 7b of the corresponding double clutch shaft 7. In addition, the number of teeth of the related gear is set so that the straight travel reduction ratio from the left and right side clutch gears 6c, 6c of the side clutch shaft 6 is equal to the straight travel reduction ratio from the center gear 6a. Specifically, the number of gear teeth is Z1 for the left and right side clutch gears 6c, 6c, Z2 for the straight traveling gear 7c of the double clutch shaft 7, Z3 for the output gear 7b, and the left-right difference of the differential gear shaft 8. When the moving gears 8b and 8b are Z4, the center gear 6a of the side clutch shaft 6 is Z5, the differential case gear 8a of the differential gear shaft 8 is Z6, and the left and right wheel gears 9a and 9a are Z7, the left and right side clutch gears 6c, For example, Z1 = Z4, Z2 = so that the linear reduction ratio (Z2 / Z7) from 6c becomes equal to the linear reduction ratio (Z1, Z4, Z6) / (Z3, Z5, Z7) from the center gear 6a. The number of gear teeth is set so as to satisfy the relationship of Z3, Z5 = Z6.

  In the traveling transmission device 1 configured as described above, the differential case gear 8a is arranged on the side portion of the differential case 8c, and the corresponding output gear 7b is arranged on the shaft end side to constitute the double clutch shaft 7. Therefore, the differential case 8c Thus, the double clutch shaft 7 can be disposed across the center line of the differential mechanism. Therefore, even if the double clutch mechanism 7a is configured to be long in the axial direction, the traveling transmission device 1 can be configured to be compact by suppressing overhanging in the width direction.

  Further, the double clutch shaft 7 is provided with a turning gear 7d and a rectilinear gear 7c having a predetermined outer diameter in the range from the double clutch mechanism 7a to the output gear 7b, and these are arranged in this order. Therefore, the double clutch mechanism 7a can be attached to and detached from the side of the double clutch shaft 7 freely in the axial direction. Therefore, when the double clutch mechanism 7a and the like are maintained, the double clutch shaft 7 can be detached and maintained easily without requiring the entire disassembly operation of the traveling transmission device. In particular, maintenance is further facilitated by configuring the double clutch mechanism 7a at a position opposite to the driving operation portion f.

  When traveling straight by the travel transmission device 1, the left and right side clutch gears 6 c and 6 c of the side clutch shaft 6 are transmitted to the left and right wheel shafts 9 and 9 at the same speed on the left and right to enable straight traveling travel transmission. In this case, since the straight speed reduction ratio from the left and right side clutch gears 6c, 6c and the straight speed reduction ratio from the center gear 6a are the same, the differential gear shaft 8 is not required to control the double clutch mechanism 7a. The left and right differential gears 8b, 8b and the differential case 8c rotate integrally at the same speed. Therefore, it is possible to improve the durability and compactness of the double clutch mechanism 7a.

  On the other hand, during turning, the transmission system on the turning center side is disconnected by the side clutch gear 6c, and the axial position of the double clutch mechanism 7a is hydraulically controlled, so that the side clutch shaft 6 according to the braking force is controlled. The double clutch shaft 7 is controlled to be steplessly decelerated within the range of the second speed received from. The differential case 8c is decelerated in accordance with the deceleration control of the double clutch shaft 7, and the differential gear 8b and the wheel shaft 9 on the corresponding side are differentially decelerated to enable turning traveling transmission.

  Next, the configuration of another traveling transmission device will be described. In the following description, the same members as those described above are denoted by the same reference numerals and the description thereof is omitted. FIG. 4 is a configuration development view of another traveling transmission device. In FIG. 4, the traveling transmission device 11 has a reduction output shaft 12 interposed between the differential gear shaft 8 and the left and right wheel shafts 9, 9, and the left and right large-diameter gears 12 a, The left and right differential gears 8b and 8b of the differential gear shaft 8 are engaged with the left and right large-diameter gears 12a and 12a, and the left and right side clutch gears 6c and 6c of the side clutch shaft 6 are engaged. To do. Further, left and right small-diameter gears 12b and 12b are formed outside the left and right large-diameter gears 12a and 12a of the deceleration output shaft 12, and the left and right small-diameter gears 12b and 12b are left and right by large-diameter left and right wheel gears 9a and 9a. The wheel shafts 9 and 9 are decelerated and transmitted.

  The traveling transmission device 11 having the above-described configuration can reduce the transmission torque capacity to the differential gear shaft 8 on the high speed side by providing the deceleration output shaft 12. The differential mechanism and the like of the dynamic gear shaft 8 can be made compact, and the small output small machine can be shared with the members. Further, since the deceleration width between the deceleration output shaft 12 and the left and right wheel shafts 9 and 9 can be set small, the left and right wheel gears 9a and 9a can be reduced in diameter, and as a result, the minimum ground clearance can be reduced. Since it can be made large, condition adaptability can be improved. Furthermore, the longitudinal dimensions of the differential gear shaft 8 and the side clutch shaft 6 can be kept small by configuring the left and right large-diameter gears 12a and 12a of the deceleration output shaft 12 inside the left and right small-diameter gears 12b and 12b. Therefore, it is possible to reduce the size of the traveling transmission device 11 by reducing the size in the width direction.

  In a traveling power transmission device for a combine that includes a differential mechanism and a double clutch mechanism and that travels in a swingable manner, it is possible to make the size in the width direction compact by suppressing protrusion of a clutch that is long in the axial direction.

It is a left view of a combine provided with the traveling transmission apparatus of this invention. It is a left side enlarged view of the traveling transmission apparatus of FIG. FIG. 3 is a developed cross-sectional view of a main part of the traveling transmission device of FIG. 2. It is a structure development view of another traveling transmission device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling transmission device 1a Mission case 2 Input shaft 3 Sub-transmission shaft 4 Counter shaft 5 Deceleration shaft 6 Side clutch shaft 6a Center gear 6b Small diameter gear 6c Side clutch gear 7 Dual clutch shaft 7a Dual clutch mechanism 7b Output gear 7c Gear (input gear)
7d Turning gear (input gear)
8 Differential gear shaft (differential mechanism)
8a Differential case gear 8b Differential gear (differential shaft)
8c Differential case 9 Wheel shaft 9a Wheel gear 11 Traveling transmission device 12 Deceleration output shaft 12a Large diameter gear 12b Small diameter gear d1 to d3 Outer diameter e Crawler f Driving operation part Z1 to Z7 Number of teeth

Claims (1)

The transmission case includes an input shaft, a sub-transmission shaft, a counter shaft, a reduction shaft, a side clutch shaft, a double clutch shaft, a differential gear shaft, and left and right wheel shafts.
The input shaft receives prime mover power through a hydrostatic continuously variable transmission,
The sub-transmission shaft is provided with a slide gear whose position can be selected by manual operation, and the power of the input shaft is output to the counter shaft with a plurality of gear ratios.
The reduction shaft is provided with a reduction gear that outputs the transmission power of the counter shaft at a substantially central position while reducing the transmission power of the counter shaft at a predetermined transmission ratio.
The side clutch shaft includes a center gear that receives power from the reduction shaft , a small-diameter gear, and left and right side clutch gears that can be engaged and disengaged in the axial direction with respect to the center gear while dividing the transmission system into left and right. Mesh the left and right wheel gears with the left and right wheel shafts .
The dual clutch shaft is provided with a dual clutch mechanism and an output gear of a hydraulic pack configuration divided at both shaft ends, and the dual clutch mechanism is provided at a position opposite to the operation unit, and the dual clutch shaft It is made detachable in the axial direction, and between the output gear and the double clutch mechanism, a small-diameter linear gear and a large-diameter turning gear are arranged in this order as the input gear of each clutch of the dual clutch mechanism,
A small-diameter gear attached to the side clutch shaft is always meshed with the turning gear, and a center gear provided on the side clutch shaft is always meshed with the linear gear,
Left and right differential gears are pivotally supported on the differential gear shaft, a differential case for differentially moving the left and right differential gears is provided, and the output gear of the dual clutch shaft is meshed with the differential case gear provided on the side of the differential case Let
A traveling drive device for a combine, wherein the left and right differential gears are meshed with the left and right wheel gears supported on the wheel shaft.

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