JP4333118B2 - Front PTO shaft structure for tractor midmoor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a front PTO shaft structure for a midmoor of a tractor that drives a mower for mowing, and in particular, while maintaining a predetermined lift range of the midmoor, suppresses a decrease in transmission efficiency of a midmoor driving force, and durability of a transmission member The present invention relates to a front PTO shaft structure for a midmoor of a tractor that can be improved.
[0002]
[Prior art]
The thing of patent document 1 is known as a front PTO shaft structure for mid mowers of a tractor. This is to drive a mid-mount mower loaded between the front wheels and the rear wheels by a PTO shaft configured at the front of the machine body. The PTO shaft is driven by a belt from an output shaft projecting in front of the engine, and can drive a mid-mount mower whose vertical height position is variable via a universal joint. The same applies to the power take-out device described in Patent Document 2.
[Patent Document 1]
Japanese Utility Model Publication No. 58-22330 [Patent Document 2]
Japanese Utility Model Publication No. 59-158528
[Problems to be solved by the invention]
However, mid mowers are used at low positions so that they are in contact with the ground during mowing work, while mowing work is necessary because they need to be lifted to a predetermined high position to ensure a minimum ground clearance when moving the work place. In the low position, the swing angle due to the intersection of the universal joint axis increases, and the power transmission efficiency requires a large amount of power to compensate for the decrease, and an unreasonable force may act on the universal joint. Also had problems.
[0004]
It is an object of the present invention to provide a front PTO shaft structure for a mid tractor of a tractor that can suppress a decrease in transmission efficiency of a mid moor driving force while ensuring a predetermined lift range of the mid moor and can improve the durability of a transmission member. It is in.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an output shaft (9) taken out from an engine (3) loaded on a front portion of a body frame (1 ) to the front side thereof,
A tractor midmoor that drives a midmoor (7) provided with a PTO shaft (13) having a pulley (15) that receives power from the output shaft (9) by belt transmission and that can be lifted below the fuselage frame (1). Front PTO shaft structure for
Said PTO shaft (13), and cantilevered supported by a bearing disposed on the front side of its (17),
The PTO shaft (13) and the input shaft (7a) of the midmoor (7) are connected by a telescopic shaft (21) having universal joints (19, 20) at both ends, and a pulley disposed immediately after the bearing (17). (15) immediately after, arranged universal joint (19), a rear universal joint (20) arranged in proximity to Middomoa (7),
The midmower (7) pivotally supports the left and right blade shafts (45, 45) so as to stand up on the case deck (43), and the driven pulley (47, 45) above the left and right blade shafts (45, 45). 48)
A bevel gear case (55) provided at the front of the case deck (43) is pivotally supported by a vertical axis (51) with a drive pulley (49) attached thereto,
This vertical axis (51) is perpendicularly meshed with the horizontally arranged input shaft (7a) and is connected to the two idlers (57, 58) close to the right driven pulley (48) and the left driven pulley (47). The adjacent idler (59) is raised on the upper surface of the case deck (43),
Between these idlers (57, 58, 59), a driving pulley (49) and a driven pulley (47, 48), a double-sided toothed belt (53) is laid in series, and the driven pulley (47, 48). The left and right blade shafts (45, 45) are driven in reverse to each other by meshing each of these with corresponding surfaces of the belt (53) .
[0006]
The PTO shaft receives power to the pulley from the engine via a belt, pulley cantilevered by the previous bearing of the front universal joint is arranged immediately after the pulley, adjacent the rear of the universal joint to Middomoa And place it. Therefore, since the mid-mount mower is driven by the universal joint that extends over the entire length between the pulley and the midmoor and the telescopic shaft so that the vertical height position is variable, the swing angle of the universal joint at the vertical position of the midmoor can be kept small.
[0007]
The invention according to claim 2, the axis of the PTO shaft, characterized in that angle as move down the machine body backward.
[0008]
The angle between the axis of the PTO shaft and the telescopic shaft is reduced by inclining the PTO shaft so that its axis is lowered toward the rear of the aircraft .
[0009]
【The invention's effect】
The front PTO shaft structure for midmoor of the tractor of the present invention has the following effects.
Since the PTO shaft is cantilevered by a bearing disposed immediately before the pulley, the front universal joint can be disposed immediately after the pulley. Further, since the rear universal joint (20) is disposed close to the midmoor (7), the distance between the front universal joint and the rear universal joint can be increased, and the telescopic shaft can be lengthened. . Therefore, even if the lift position of the midmower is changed up and down, the maximum deflection angle due to the intersection between the axis of the PTO shaft and the input shaft of the midmower and the telescopic shaft can be kept small. Therefore, it is possible to suppress a decrease in the transmission efficiency of the mower driving force due to the universal joint, thereby reducing noise and ensuring the durability of the transmission member.
In addition, it is possible to simply configure the left and right blade shafts to reverse each other without requiring a reverse gear mechanism, and it is possible to improve the maintainability thereof.
[0010]
In addition, by configuring the axis of the PTO axis to incline so as to descend to the rear of the aircraft , the angle of intersection between the universal joint and the telescopic shaft can be kept small in the mid-mower lift range. Accordingly, it is possible to improve the transmission efficiency of the mower driving force by the universal joint and the durability of the transmission member .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
[0012]
A perspective side view of a front PTO shaft structure example of the present invention is shown in FIG. 1 and 2, the tractor is configured such that the engine 3 is loaded on the front portion of the body frame 1 and the midmoor 7 can be lifted up and down between the front and rear wheels 5 that support the body frame 1. In order to drive the midmoor 7, the output shaft 9 is taken out from the flywheel 3a of the engine 3 to the front side, and the PTO shaft 13 transmitted from the output shaft 9 by the belt 11 is formed at the front of the body below the body frame 1. To do. A clutch wheel 12 is provided on the side of the belt 11 to control belt transmission.
[0013]
The PTO shaft 13 includes a pulley 15 that receives power, and the front side of the PTO shaft 13 is pivotally supported by the body frame 1 by a bearing 17 between the PTO shaft 13 and the input shaft 7a of the rear midmower 7. The telescopic shaft 21 provided with the universal joints 19 and 20 is provided at each of the opposed end portions. The front universal joint 19 is configured close to the pulley 15 of the PTO shaft 13, and the rear universal joint 20 is configured as close to the midmoor 7 as possible.
[0014]
The PTO shaft 13 configured as described above receives power from the engine 3 via the belt 11 through the belt 11 under the control of the clutch wheel 12, and drives the input shaft 7 a of the midmoor 7 via the telescopic shaft 21. The rotational power of the PTO shaft 13 is transmitted to the midmoor 7 by the telescopic shaft 21 with a universal joint even when the lift position of the midmoor 7 changes vertically. In this case, since the PTO shaft 13 is pivotally supported by the bearing 17 disposed on the front side of the pulley 15, the universal joint 19 can be disposed in the vicinity of the pulley 15, and the distance between the universal joint 19 and the universal joint 20. can be made large, Runode can increase the telescopic shaft 21, by vertical changes in the lift position of Middomoa 7, by the intersection of the axis of the input shaft 7a of the PTO shaft 13 and Middomoa 7 and telescopic shaft 21 The maximum deflection angle can be reduced (for example, 15 degrees). Therefore, it is possible to suppress a decrease in the transmission efficiency of the mower driving force by the universal joints 19 and 20, thereby reducing noise and ensuring the durability of the transmission member.
[0015]
Next, an example in which the PTO axis is inclined is described. A perspective side view of a configuration example in which the central axis of the PTO axis is inclined is shown in FIG. Hereinafter, the same members as those described above are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 3, the engine 3 is loaded at a predetermined angle α on the front part of the body frame 1 of the tractor. The output shaft 9 is taken out from the flywheel 3a of the engine 3 to the front side, and the PTO shaft 13 transmitted from the output shaft 9 by the belt 11 is placed on the front of the body below the body frame 1 at a predetermined angle α as in the engine 3. The belt transmission system is constructed in parallel with each other. The inclination angle α is configured such that the axis line of the PTO shaft 13 is aligned with the lift intermediate height position of the midmoor 7 and is lowered to the rear of the machine body.
[0016]
The PTO shaft 13 having the above-described configuration is inclined so that the axis thereof is lowered toward the rear of the machine body, and is set to a predetermined angle α (for example, 5 degrees) according to the lift intermediate height position of the midmoor 7. (For example, the conventional maximum angle of 25 degrees is reduced to about 19 degrees). Therefore, similarly to the above, it is possible to suppress a decrease in the transmission efficiency of the mower driving force by the universal joints 19 and 20, thereby reducing noise and ensuring the durability of the transmission member.
[0017]
Next, an example in which the PTO shaft is arranged at a low position will be described. A perspective side view of a configuration example in which the PTO shaft is disposed at a low position is shown in FIG. In FIG. 4, the bearing of the PTO shaft is configured at a lower position than the front axle 31 provided on the body frame 1 and is disposed corresponding to the lift intermediate height position of the midmoor 7.
[0018]
By setting the PTO shaft 13 having the above configuration to a predetermined position lower than the front axle 31, the vertical swing angles α1 and α2 of the universal joints 19 and 20 due to the lift of the midmoor 7 are substantially equal, and the maximum swing angle is small. It can be suppressed. Therefore, similarly to the above, it is possible to suppress a decrease in the transmission efficiency of the mower driving force by the universal joints 19 and 20, thereby reducing noise and ensuring the durability of the transmission member.
[0019]
Next, the configuration of the mid-mower drive system will be described. FIG. 5 shows a plan view of a first configuration example of the mid mower drive system. In FIG. 5, the mid mower 7 is configured as a biaxial mower by pivotally supporting the left and right blade shafts 45, 45 so as to stand up on the case deck 43 and forming a shooter 46 for discharging backward from the center. The left and right blade shafts 45, 45 are provided with blades (not shown) on each diameter line with a phase difference of 90 degrees, and their rotation regions are arranged close to each other so as to overlap in the center, and toothed followers are provided on the upper portions of the respective blade axes. Side pulleys 47 and 48 are provided.
[0020]
And rotatably supporting the vertical shaft 51 fitted with toothed drive pulley 49 you transmission belt to these driven pulley 47, 48 to the bevel gear case 55 provided on a front portion of the case deck 43, the horizontal arrangement of the vertical shaft 51 And the input shaft 7a. In addition, two idlers 57 and 58 adjacent to the right driven pulley 48 and an idler 59 adjacent to the left driven pulley 47 are erected on the upper surface of the case deck 43.
[0021]
These idler 57, 58 and 59, bridging both sides toothed belt 53 to a series between the drive-side-pulleys 49 and the driven-pulleys 47 and 48, right and left each belt driven pulley 47, 48 The left and right blade shafts 45 and 45 are driven in reverse to engage with each other surface 53.
[0022]
By configuring the drive system of the mid mower 7 as described above, the left and right blade shafts 45, 45 can be simply configured to reverse each other without requiring a reverse gear mechanism, and the maintainability thereof is improved. can do.
[0023]
Next, a second configuration example of the mid mower drive system will be described. A perspective plan view of a second configuration example of the mid mower drive system is shown in FIG. 6, its A arrow view is shown in FIG. 7, and similarly its B arrow view is shown in FIG. 6 to 8, the left blade shaft 45 of the midmower 7 is reversely meshed with the left pulley shaft 63 via a reverse gear case 61.
A pulley 47 is attached to the pulley shaft 63, and a pulley 48 is attached to the right blade shaft 45, and idlers 65, 65 are raised on the upper surface of the case deck 67 in a substantially bilaterally symmetric position.
[0024]
The bevel gear case 55 is attached to the front portion of the case deck 67 at a low position so as to be embedded. The bevel gear is journaled a drive-side-pulleys 49 to the case 55, to bridge sided toothed belt 66 to a series through the two idler 65 and 65 to left and right driven pulleys 47, 48 from the drive pulley 49 . By the engagement of the belt 66, the left and right blade shafts 45, 45 are driven to rotate in reverse.
[0025]
In addition, blades 71 are formed at the rear edge portions of both ends of the blades 70 attached to the blade shafts 45, 45, and the case deck 67 is shown in a cross-sectional view taken along the line CC in FIG. As shown in FIG. 9, the left and right blade shafts 45, 45 are surrounded by the inclined portion 67 a of the case deck 67, and intake windows 69 are formed at the base thereof. Belt covers 73 and 73 are provided on the case deck 67 so as to cover the intake windows 69 and the left and right driven pulleys 47 and 48.
[0026]
By configuring the drive system of the mid mower 7 as described above, the overall height of the mid mower 7 can be reduced in accordance with the bevel gear case 55 formed at a low position. As a result, since the minimum ground clearance when the midmoor 7 is lifted to a high position can be secured, handling when moving the work place becomes easy.
[0027]
In addition, the air intake windows 69 of the case deck 67, in particular when mowing the grass so as to be densely installed on the ground at a low position, can secure the intake air so that the grass can be efficiently sent from the shooter. The grass can be collected without staying in the case deck 67 and without leaving mowing waste on the ground. Further, the mowing swarf that has entered the belt covers 73, 73 is sucked into the air intake windows 69 ... along with the air flow that passes through or by sliding down the inclined portion 67a of the case deck 67. It is possible to prevent the mowing grass from staying in 73.
[Brief description of the drawings]
FIG. 1 is a perspective side view of an example of a front PTO shaft structure according to the present invention. FIG. 2 is a partial view taken along arrow A in FIG. 1. FIG. 3 is a perspective side view of a configuration example in which a central axis of a PTO shaft is inclined. FIG. 5 is a plan view of a first configuration example of the midmoor drive system. FIG. 6 is a plan view of a second configuration example of the midmower drive system. 6 is a view taken along an arrow A in FIG. 6. FIG. 8 is a view taken along an arrow B in FIG. 6. FIG. 9 is a cross-sectional view taken along a line CC in FIG.
DESCRIPTION OF SYMBOLS 1 Airframe 3 Engine 5 Front and rear wheel 7 Mid mower 7a Input shaft 9 Output shaft 11 Belt 13 PTO shaft 15 Pulley 17 Bearing 19 and 20 Universal joint 21 Telescopic shaft 31 Front axle 47 and 48 Drive side pulley
49 Driving pulley 53 Belt 55 Bevel gear case 57, 58, 59 Idler 65 Idler 66 Belt 67a Inclined portion 69 Intake window 71 Blade 73 Belt cover α Inclination angle

Claims (2)

An output shaft (9) taken out from the front side of the engine (3) loaded on the front part of the fuselage frame (1) ;
A tractor midmoor that drives a midmoor (7) provided with a PTO shaft (13) having a pulley (15) that receives power from the output shaft (9) by belt transmission and that can be lifted below the fuselage frame (1). Front PTO shaft structure for
Said PTO shaft (13), and cantilevered supported by a bearing disposed on the front side of its (17),
The PTO shaft (13) and the input shaft (7a) of the midmoor (7) are connected by a telescopic shaft (21) having universal joints (19, 20) at both ends, and a pulley disposed immediately after the bearing (17). immediately after (15), arranged front universal joint (19), a rear universal joint (20) arranged in proximity to Middomoa (7),
The midmower (7) pivotally supports the left and right blade shafts (45, 45) so as to stand up on the case deck (43), and the driven pulley (47, 45) above the left and right blade shafts (45, 45). 48)
A bevel gear case (55) provided at the front of the case deck (43) is pivotally supported by a vertical axis (51) with a drive pulley (49) attached thereto,
This vertical axis (51) is perpendicularly meshed with the horizontally arranged input shaft (7a) and is connected to the two idlers (57, 58) close to the right driven pulley (48) and the left driven pulley (47). The adjacent idler (59) is raised on the upper surface of the case deck (43),
Between these idlers (57, 58, 59), a driving pulley (49) and a driven pulley (47, 48), a double-sided toothed belt (53) is laid in series, and the driven pulley (47, 48). And the left and right blade shafts (45, 45) are driven in reverse to each other, and the front PTO shaft structure for a midmoor of a tractor. Middomoa for front PTO shaft structure of the tractor according to claim 1, axis, characterized in that angle as such falls fuselage rear of the PTO shaft.

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