KR102372142B1 - Transmission of agriculture vehicle - Google Patents

Abstract

A hydrostatic continuously variable transmission (HST) is installed in the clutch housing between the engine and the transmission case, some of the power output from the HST is withdrawn through the power take-off line, and the other part is driven to the wheels of the vehicle through the power transmission line. Disclosed is a power transmission device for an agricultural work vehicle having a structure transmitted by power. The HST of the power transmission device according to the present invention has an input shaft to which engine power is input, and a first output shaft and a second output shaft for outputting power input through the input shaft to the power take-off line and the power transmission line, respectively, and the first output shaft The PTO input shaft constituting the power take-off line is directly connected to form a coaxial arrangement, and the driving input shaft constituting the power transmission line is directly connected to the second output shaft parallel to the first output shaft to form a coaxial arrangement, and the rotational power of the driving input shaft is A mission in which the driving output shaft is connected to the driving input shaft to transmit power through the driving idle gear so that it is transmitted to the secondary transmission unit in the mission case and the second shift occurs, and the driving idle gear connecting the driving input shaft and the driving output shaft surrounds the PTO input shaft It is rotatably installed on the boss part of the front cover of the case to transmit the power of the travel input shaft to the travel output shaft and at the same time to stably support the rotational motion of the travel input shaft.

Description

Transmission of agriculture vehicle

The present invention relates to a power transmission device for an agricultural work vehicle, and more particularly, to a power transmission device for an agricultural work vehicle equipped with a hydrostatic transmission (HST).

In general, the power transmission device of an agricultural driving vehicle has a structure in which a clutch housing and a transmission case are sequentially installed from the engine to the rear axle, which is the driving axle. Efforts such as commonizing the clutch housing or the transmission case are being attempted.

In particular, the power transmission device applied to agricultural work vehicles, such as tractors, typically has a configuration in which a main transmission mechanism and an auxiliary transmission mechanism are arranged in series on a running transmission system, and as a main transmission mechanism, shift operation is easy and shift shock A power transmission device employing a hydrostatic continuously variable transmission (hereinafter referred to as "HST") which hardly occurs is known.

In Japanese Patent Laid-Open No. 1997-011769, the HST, which is the main gear, is accommodated in the transmission case that houses the auxiliary transmission mechanism, and the shift operation shaft for changing the volume of the HST (manipulating the movable swash plate) protrudes from the transmission case to the side. Disclosed is a power transmission device configured to connect an arm fixedly installed on the operation shaft to a main speed operation lever through a link or the like.

In the HST having such a structure, the noise generated by the reciprocating movement of the hydraulic pump plunger of the HST in operation through the operation shaft and the arm fixedly installed on the operation shaft is directly leaked to the outside of the transmission case, and to the transmission case There is a problem that the noise around the HST accommodating part is large.

In addition, since the horizontal input shaft (pump shaft) and the horizontal output shaft (motor shaft) of the HST are arranged in the vertical direction, the lower end position of the HST is lowered by that much, making it difficult to secure sufficient ground clearance structurally. Since the HST device has a structure that is difficult to disassemble/assemble, it is disadvantageous in terms of assembly and maintainability and has disadvantages in terms of space utilization in the mission case.

Japanese Patent Application Laid-Open No. 1997-011769 (published on January 14, 1997)

The problem to be solved by the present invention is to improve HST assembly and maintainability, and to increase space utilization through efficient arrangement of parts in a mission case to implement a transmission device for an agricultural work vehicle in a more compact size.

Another object to be solved by the present invention is to provide a transmission device for an agricultural work vehicle having a structure capable of maximally suppressing noise and vibration when driving the device, as well as improving the durability of the device.

Another object to be solved by the present invention is to provide a transmission device for an agricultural work vehicle having a structure that can sufficiently secure the ground clearance applied to the vehicle.

The present invention as a means to solve the problem,

A hydrostatic continuously variable transmission (HST) is installed in the clutch housing between the engine and the transmission case, some of the power output from the HST is withdrawn through the power take-off line, and the other part is driven to the wheels of the vehicle through the power transmission line. In the power transmission device of an agricultural work vehicle having a structure transmitted by power,

The HST has an input shaft to which engine power is input, and a first output shaft and a second output shaft for outputting power input through the input shaft to the power take-off line and the power transmission line, respectively, and the power take-off line is configured on the first output shaft The PTO input shaft is directly connected to form a coaxial arrangement, and the driving input shaft constituting the power transmission line is directly connected to the second output shaft parallel to the first output shaft to form a coaxial arrangement,

The driving output shaft is connected to the driving input shaft through the driving idle gear to transmit power so that the rotational power of the driving input shaft is transmitted to the auxiliary transmission unit in the transmission case to make a secondary shift, and the driving idle connecting the driving input shaft and the driving output shaft It provides a power transmission device for an agricultural work vehicle, characterized in that the gear is rotatably installed in the boss portion of the front cover of the transmission case surrounding the PTO input shaft and configured to support the driving input shaft.

The clutch housing applied to the present invention may have a configuration in which an internal space is partitioned into a front chamber and a rear chamber by a partition wall, a gearbox intermittently receiving power from the engine and outputting it to the rear chamber is installed in the front chamber, and the gearbox is installed in the rear chamber The HST may be installed to determine the rotational direction and speed of the power output by the box and output it to the power take-off line and the power transmission line.

At this time, the gearbox includes an input gear to which power intermittently provided from the engine through the clutch is input, an output gear that rotates in mesh with the input gear and is directly connected to the HST input shaft, and the input gear and the output gear of the clutch housing to surround the input gear. It may be of a configuration including a gear case installed on the bulkhead.

In addition, the auxiliary transmission unit according to an embodiment of the present invention is directly connected to form a coaxial arrangement with the traveling output shaft, the auxiliary transmission input shaft including a plurality of auxiliary transmission prime gears having different diameters, corresponding to each of the auxiliary transmission prime mover gears A plurality of auxiliary transmission driven gears provided to be engaged are rotatably installed on the auxiliary transmission output shaft and the auxiliary transmission output shaft to be slidably installed, and for intermittent power transmission between one of the auxiliary transmission driven gears and the auxiliary transmission output shaft. It may be a configuration having a synchronous meshing type shifting mechanism including a shifter.

The power transmission device according to an embodiment of the present invention is also installed in the transmission case and driven by the power branched from the auxiliary transmission unit, and the branched power between the front wheel propulsion shaft and the front wheel is transmitted to the front wheel, which is the steering wheel. It may further include a; double speed turn unit intermittent in the middle.

At this time, the double speed turn unit is preferably directly connected to form a coaxial arrangement with the front wheel propulsion shaft and the double speed turn input shaft provided to intermittently receive the second-shifted power through the shift gear to the auxiliary transmission output shaft of the auxiliary transmission unit, It may include a double speed turn output shaft provided to receive power from: the double speed turn input shaft through a pair of spur gears.

According to an embodiment of the present invention, the traveling idle gear connecting the traveling input shaft and the traveling output shaft is installed in the boss portion of the mission case surrounding the PTO input shaft. As a result, the effort to secure a separate space for installing the driving idle gear can be minimized, and the overall volume can be reduced as the space occupied by the idle gear is reduced, so that the power transmission device can be implemented in a more compact size.

In addition, since the running idle gear is rotatably installed in the mission case, which is a heavy structure, there is an advantageous effect in terms of durability of the device, and noise and vibration caused by driving the idle gear can be suppressed as much as possible. Since it serves to support the driving input shaft with respect to the mission case, which is a heavy object, the rotational movement of the driving input shaft can be made stably.

In addition, the present invention has the effect of improving assembly and maintainability by dividing the inner space of the clutch housing with a partition wall so that the HST can be separated/assembled in one space. It can be installed so as to form a spaced arrangement parallel to the width direction, thereby increasing the ground clearance of the vehicle can improve the working environment.

1 is an exploded view of a power transmission device for an agricultural work vehicle according to an embodiment of the present invention;
Figure 2 is a schematic diagram schematically showing the power transmission device shown in Figure 1;
Figure 3 is an enlarged view of the gearbox side of Figure 1;
FIG. 4 is an enlarged view of the HST output side of FIG. 1;
5 is an enlarged view showing the side of the auxiliary transmission unit of FIG. 1 .

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

Terms used in the specification are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and includes one or more other features or It should be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof does not preclude in advance the possibility of addition.

Also, terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “…unit”, “…unit”, “…module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. can

In the description with reference to the accompanying drawings, the same reference numerals will be assigned to the same components for the same components, and overlapping descriptions thereof will be omitted. In the description of the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is an exploded view of a power transmission device for an agricultural work vehicle according to an embodiment of the present invention, and FIG. 2 is a schematic diagram schematically illustrating the power transmission device shown in FIG. 1 . And FIG. 3 is an enlarged view of the main part of the present invention showing an enlarged view of the gearbox side of FIG. 1, and FIGS. 4 and 5 are enlarged views of the HST output side and the auxiliary transmission unit side of FIG. 1, respectively. It is also

In the development view of FIG. 1, in order to help understanding of the invention, the driving input shaft 56 directly connected to the second output shaft (hydraulic motor output shaft, 46) of the HST 40 is arranged in parallel to the lower part of the second output shaft 46. Although expressed, it is preferable to understand that it is arranged so as to be parallel to the adjacent side of the PTO input shaft 52 directly connected to the first output shaft 43 and directly connected to form a coaxial arrangement with the second output shaft 46 .

1 to 5 , the power transmission device according to an embodiment of the present invention includes the HST 40 installed in the clutch housing 10 between the engine and the transmission case 20 . The HST 40 intermittently receives power from the engine through the clutch (not shown) and the gearbox 30, and appropriately changes the rotational speed of the received power to output some as power for driving an external work machine, and another part is output as driving power.

HST (40) is composed of one variable capacity hydraulic pump (40a) and one constant capacity hydraulic motor (40b), the hydraulic pump (40a) is driven by the engine power to suck hydraulic oil to the hydraulic motor (40b) at a predetermined pressure ) side, the hydraulic motor 40b rotates at the discharge flow rate from the hydraulic pump 40a and rotates the internal power transmission element with the rotational force to output the shifted power to the outside.

The motor shaft rotation speed and direction of the hydraulic motor 40b are determined by the flow rate and circuit pressure load sent from the variable capacity hydraulic pump 40a. For this purpose, the variable capacity hydraulic pump 40a is equipped with a plurality of pistons. It consists of a cylinder block, a trunnion swash plate that reciprocates the piston, and a pump shaft that rotates the cylinder block.

Engine power is input to the HST 40 through the input shaft 42 of the hydraulic pump 40a. Some of the input power to the HST 40 is transmitted to the power take-off line PL1 through the hydraulic pump 40a output shaft (hereinafter referred to as 'first output shaft 43') opposite the input shaft 42 to drive the work machine. It is drawn out as power for the purpose, and the other part is internally shifted through the hydraulic motor 40b output shaft parallel to the first output shaft 43 (hereinafter referred to as 'second output shaft 46') through a power transmission line ( PL2).

That is, the HST 40 has one input shaft 42 to which engine power is input, and two output shafts for outputting the power input through the input shaft 42 to the power take-off line PL1 and the power transmission line PL2, respectively. It can be configured to have (43, 46). The PTO input shaft 52 constituting the power take-off line PL1 is directly connected to form a coaxial arrangement with the first output shaft 43, and the second output shaft 46 has a travel input shaft 56 constituting the power transmission line PL2. It is directly connected to achieve this coaxial arrangement.

The clutch housing 10 may have a configuration in which an internal space is divided into a front chamber 11 and a rear chamber 13 by a partition wall 12 . At this time, a gearbox 30 that intermittently receives power from the engine and outputs it to the rear compartment 13 is installed in the front compartment 11 , and the rotation direction and speed of the power output from the gearbox 30 is installed in the rear compartment 13 . The HST 40 that determines and outputs to the power take-out line PL1 and the power transmission line PL2 may be installed.

The gearbox 30 installed in the front chamber 11 of the clutch housing 10 rotates in engagement with the input gear 31 and the input gear 31 to which power intermittently provided from the engine through a clutch (not shown) is input. and an output gear 33 directly connected to the input shaft 42 of the HST 40 and a gear case installed on the partition wall 12 of the clutch housing 10 so as to surround the input gear 31 and the output gear 33 ( 35) may be included (see FIG. 3).

The input gear 31 may have a configuration in which a part protrudes to the outside of the gear case 35 so as to be connected to an engine output shaft (not shown) to transmit power, and a partition wall ( A plurality of bearing members (B) for supporting the rotational motion of the input gear 31 and the output gear 33 may be installed between 12). In addition, the input shaft 42 of the HST 40 extending from the rear chamber 13 of the clutch housing 10 through the partition wall 12 is matched to the output gear 33 .

Preferably, the output gear 33 and the input gear 31 are arranged so that the output gear 33 and the input gear 31 are parallel to each other on a plane perpendicular to the rotation centers of the output gear 33 and the input gear 31 . It may be arranged vertically to achieve this, or may be horizontally arranged to form parallel to each other in the left and right directions coincident with the width direction of the vehicle body. In addition, the two gears may be disposed in a diagonal direction and installed so as to be circumscribed.

The primary shifted rotational power input to the driving input shaft 56 through the second output shaft 46 is transmitted to the auxiliary transmission unit 70 disposed in the transmission case 20, and through secondary shifting, the wheels, specifically It is provided as driving power to the rear axle (not shown) through the wheel drive gear 90 . To this end, the traveling output shaft 58 is connected to the traveling input shaft 56 to transmit power through the traveling idle gear 57 , and the auxiliary transmission input shaft 72 of the auxiliary transmission unit 70 is directly connected to the traveling output shaft 58 . do.

As shown in FIG. 4 , the running idle gear 57 may be installed on the boss portion 24 of the front cover 22 of the mission case 20 . The boss part 24 surrounds a part of the PTO input shaft 52 directly connected to the first output shaft 43 and rotatably supports the PTO input shaft 52 via a bearing member B interposed therebetween. and the traveling idle gear 57 may be freely installed on the mounting surface 240 of the outer surface of the boss 24 through the bearing member B.

As the running idle gear 57 is rotatably installed in the mission case 20, which is a heavy structure, noise or vibration caused by driving the idle gear 57 is suppressed, and structurally, the idle gear 57 is a heavy object. Since it serves to support the driving input shaft 56 with respect to the in-mission case 20, the rotational motion of the driving input shaft 56 and power transmission to the driving output shaft 58 can be stably performed without loss.

The auxiliary transmission unit 70 may be configured to form a plurality of secondary shift stages by a known synchronous meshing type shift mechanism. As such, the auxiliary transmission unit 70 having a synchronous meshing shift mechanism shifts the primary shifted power through the HST 40 corresponding to the primary main transmission once again according to the work situation or driving situation according to the driver's operation. output to the wheel drive gear 90 .

Specifically, as shown in FIG. 5 , the auxiliary transmission unit 70 includes an auxiliary transmission input shaft 72 directly connected to form a coaxial arrangement with the travel output shaft 58 , and the power finally shifted to the wheel drive gear 90 . It includes a sub-transmission output shaft 74 for outputting. In addition, it includes a plurality of shifters (76a ~ 76c) for selectively controlling the power connection between the auxiliary transmission input shaft (72) and the auxiliary transmission output shaft (74).

A plurality of sub transmission prime mover gears 73a to 73c having different diameters are integrally or splined to the sub transmission input shaft 72 to rotate integrally with the sub transmission input shaft 72, and the sub transmission prime mover gears 73a to 73c ) on the sub-transmission output shaft 74 to correspond to each of the sub-transmission driven gears (75a to 75c) are disposed between the sub-transmission output shaft 74 and the sub-transmission output shaft (B) through the bearing member (B). 74) is freely installed for rotation.

The plurality of shifters 76a to 76c are mounted in a spline structure on the auxiliary transmission output shaft 74 and linearly move along the auxiliary transmission driven gears 75a to 75c corresponding to the shift stage selected by the driver and the auxiliary transmission output shaft ( 74) to enable power transmission or release the connection, and for this purpose, each shifter may be operably connected to the sub-shift lever through a shift fork and a shift control shaft (not shown).

1 and 2, and in FIG. 5, reference numeral 80 denotes a double speed turn unit. The power transmission device according to the present invention may include a double speed turn unit (80). The double speed turn unit 80 is installed in the transmission case 20 and may be driven by power branched from the auxiliary transmission unit 70 . Specifically, it serves to intermittently control transmission of the branched power to the front wheel, which is the steering wheel, between the front wheel propulsion shaft 100 and the front wheel propulsion shaft 100 .

When the double speed turn unit 80 is operated in the direction connecting the auxiliary transmission unit 70 and the front wheel propulsion shaft 100, a four-wheel function in which both the front and rear wheels are driven is set, and at the same time, the rotation speed of the front wheels when turning the vehicle The double speed turn function is executed to reduce the turning radius by making it faster than the rotation speed of the rear wheel. In other words, it is possible to increase the exercise performance and work efficiency in wet work by reducing the turning radius when turning the vehicle together with the 4-wheel function setting.

The double speed turn unit 80 is preferably a double speed turn input shaft ( 82) and a double speed turn output shaft 84 that is directly connected to form a coaxial arrangement with the front wheel propulsion shaft 100, and is provided to receive power from the double speed turn input shaft 82 through a pair of spur gears 83a and 83b ) may include a configuration.

Of course, the double speed turn unit 80 illustrated in the drawings is a preferred embodiment, and is not limited to the illustrated manual operation method. That is, it is a hydraulic structure using a fluid whose flow is switched according to the valve operation state of the hydraulic control valve, and the hydraulic clutch intermittently controls the power connection or release between the auxiliary transmission unit 70 side and the front wheel propulsion shaft 100 . It can be replaced by a control method.

On the other hand, unexplained reference numeral 54 in FIGS. 1 and 2 is a hydraulic clutch type PTO clutch that intermittently controls the external withdrawal of PTO power, and 60 is a power take-out line PL1 including the PTO input shaft 52 to the outside. It refers to a PTO transmission unit that shifts the rotation speed of the extracted power to a speed suitable for the type of external work machine attached to the vehicle or work situation and outputs it to the work machine.

As shown in the drawings, the PTO shift unit 60 may be configured to achieve two or more shift stages by a known synchronous meshing type shift mechanism, similarly to the sub-transmission unit 70 described above, as shown in the drawings, but is limited thereto. it's not going to be Since the hydraulic control method of the structure in which the hydraulic clutch intermittently controls the selection of the shift stage is also applicable, this may also be included in the scope of the present invention.

According to the above embodiment of the present invention, the traveling idle gear connecting the traveling input shaft and the traveling output shaft is installed in the boss portion of the mission case surrounding the PTO input shaft. As a result, it is possible to minimize the effort to secure a separate space for installing the driving idle gear, and the overall volume can be reduced as the space occupied by the idle gear is reduced, so that the power transmission device can be implemented in a more compact size.

In addition, since the running idle gear is rotatably installed in the mission case, which is a heavy structure, there is an advantageous effect in terms of durability of the device, and noise and vibration caused by driving the idle gear can be suppressed as much as possible. Since it serves to support the driving input shaft with respect to the mission case, which is a heavy object, the rotational movement of the driving input shaft can be made stably.

In addition, the present invention has the effect of improving assembly and maintainability by dividing the inner space of the clutch housing with a partition wall so that the HST can be separated/assembled in one space. It can be installed so as to form a spaced arrangement parallel to the width direction, thereby increasing the ground clearance of the vehicle can improve the working environment.

In the above detailed description of the present invention, only specific embodiments thereof have been described. However, it is to be understood that the present invention is not limited to the particular form recited in the detailed description, but rather, it is to be understood to cover all modifications and equivalents and substitutions falling within the spirit and scope of the present invention as defined by the appended claims. should be

10: clutch housing 11: front room
12: bulkhead 13: rear compartment
20: mission case 22: front cover
24: boss unit 240: mounting surface
30: gearbox 31: input gear
33: output gear 35: gear case
40: HST (Hydrostatic Transmission) 40a: hydraulic pump
40b: hydraulic motor 42: input shaft
43: first output shaft (hydraulic pump output shaft) 46: second output shaft (hydraulic motor output shaft)
52: PTO input shaft 54: PTO clutch
56: travel input shaft 57: travel idle gear
58: driving output shaft 60: PTO transmission part
70: auxiliary transmission unit 72: auxiliary transmission input shaft
73a~73c: sub-transmission prime mover gear 74 ; sub-speed output shaft
75a~75c: sub-transmission driven gear 76a~76c: shifter
80: double speed turn unit 81: shift gear
82: double speed input shaft 83a, 83b: spur gear
84: double speed turn output shaft 90: wheel drive gear
100: front wheel propulsion shaft
PL1 : Power take-off line
PL2 : Power transmission line

Claims (6)

A hydrostatic continuously variable transmission (HST) 40 is installed in the clutch housing 10 between the engine and the transmission case 20, and some of the power output from the HST 40 is withdrawn to the outside through the power take-off line PL1. In the power transmission device of an agricultural work vehicle, the other part is transmitted as driving power to the wheels of the vehicle through the power transmission line PL2,
The HST 40 includes an input shaft 42 to which engine power is input, and a first output shaft 43 for outputting power input through the input shaft 42 to the power take-out line PL1 and the power transmission line PL2, respectively. ) and a second output shaft 46 , and the PTO input shaft 52 constituting the power take-off line PL1 is directly connected to the first output shaft 43 to form a coaxial arrangement and is parallel to the first output shaft 43 . 2 The output shaft 46 is directly connected to the driving input shaft 56 constituting the power transmission line PL2 to form a coaxial arrangement,
The driving output shaft 58 is connected to the driving input shaft 56 through the driving idle gear 57 so that the rotational power of the driving input shaft 56 is transmitted to the auxiliary transmission unit 70 in the transmission case 20 to make a secondary shift. The boss part of the front cover 22 of the transmission case 20, which is connected to transmit power and surrounds the PTO input shaft 52 with the traveling idle gear 57 connecting the traveling input shaft 56 and the traveling output shaft 58 A power transmission device for an agricultural work vehicle, characterized in that it is rotatably installed on (24) and configured to support the travel input shaft (56).
The method of claim 1,
In the clutch housing 10, an internal space is divided into a front chamber 11 and a rear chamber 13 by a partition wall 12, and the front chamber 11 receives power intermittently from the engine and outputs the gear to the rear chamber 13 side. The box 30 is installed, and the HST ( 40), the power transmission device of the agricultural work vehicle, characterized in that it is installed.
3. The method of claim 2,
The gearbox 30 is
an input gear 31 to which power intermittently provided from the engine is inputted through the clutch;
an output gear 33 which rotates in engagement with the input gear 31 and is directly connected to the HST 40 input shaft 42; and
and a gear case (35) installed on the partition wall (12) of the clutch housing (10) so as to surround the input gear (31) and the output gear (33).
The method of claim 1,
The auxiliary transmission unit 70,
a sub-transmission input shaft 72 directly connected to form a coaxial arrangement with the traveling output shaft 58 and including a plurality of sub-transmission prime movers having different diameters;
a sub-transmission output shaft 74 on which sub-transmission driven gears (75a-75c) provided to be engaged corresponding to each of the sub-transmission prime mover gears (73a-73c) are rotatably installed; and
A plurality of shifters 76a to 76c that are slidably installed on the auxiliary transmission output shaft 74 and intermittently transmit power between one of the auxiliary transmission driven gears 75a ~ 75c and the auxiliary transmission output shaft 74 A power transmission device for an agricultural work vehicle, characterized in that it has a synchronous meshing type transmission mechanism, including:
The method of claim 1,
It is installed in the transmission case 20 and is driven by the power branched from the auxiliary transmission unit 70, and intermittently controls the transmission of the branched power to the front wheel, which is the steering wheel, between the front wheel propulsion shaft 100 and the front wheel. The power transmission device of the agricultural work vehicle further comprising a double speed turn unit (80).
6. The method of claim 5,
The double speed turn unit 80,
A double speed turn input shaft 82 provided to intermittently receive second-shifted power through the shift gear 81 to the auxiliary transmission output shaft 74 of the auxiliary transmission unit 70:
A double speed turn output shaft 84 that is directly connected to form a coaxial arrangement with the front wheel propulsion shaft 100 and is provided to receive power from the double speed turn input shaft 82 through a pair of spur gears 83a and 83b; Power transmission device for agricultural work vehicles, characterized in that it comprises.

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