The present disclosure relates to power take-off systems in tractors.
BACKGROUND
A power take-off system of a tractor typically supplies power to a farm equipment attached to it. A power take-off shaft is used to transfer power from the engine of the tractor to the farm equipment. The power take-off shaft can be directly coupled to the engine or can be coupled to the engine via a gearbox. A conventional power take-off system requires a separate housing on the gearbox to facilitate coupling between the power take-off shaft and the engine via the gearbox. Further, the conventional power take-off system requires a complex sleeve arrangement to couple the power take-off shaft to the engine via the gearbox. However, the separate housing and the complex sleeve arrangement add to overall cost and complexity of design. Further, the additional components, such as separate housing and the complex sleeve arrangement, increase the overall weight of the system. Additionally, servicing of such conventional power take-off systems is a cumbersome task due to their complex arrangement.
Therefore, there is felt a need of a power take-off system that alleviates the abovementioned drawbacks of the conventional power take-off systems.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
An object of the present disclosure is to provide a power take-off system that does not require separate housing on a gearbox.
Another object of the present disclosure is to provide a power take-off system that eliminates the need of complex configuration of actuating arrangement.

Yet another object of the present disclosure is to provide a power take-off system actuation arrangement that has compact configuration.
Yet another object of the present disclosure is to provide a power take-off system that is easy for servicing.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure envisages a power take-off system for a tractor. The system comprises an input shaft, a drive shaft, a first countershaft, a plurality of driving gears, a second countershaft, a plurality of driven gears, an output shaft, a first power take-off shaft segment, and a second power take-off shaft segment.
The input shaft and the drive shaft are configured to receive power from the engine of the tractor. The first countershaft is coupled to the input shaft, and is configured to receive power therefrom. The plurality of driving gears is mounted on the first countershaft. The second countershaft is configured parallel to the first countershaft. Further, a plurality of driven gears is mounted on the second countershaft, and is configured to selectively engage with plurality of driving gears. The output shaft is rotatably connected to the second countershaft. The first power take-off shaft segment is coupled to the drive shaft via a third pair of gears, and is configured to receive power therefrom. The second power take-off shaft segment is configured to be selectively coupled to the output shaft or to the first power take-off shaft segment.
The system further comprises a connecting gear slidably mounted on the second power take-off shaft segment. The connecting gear is configured to facilitate coupling of the second power take-off shaft segment with the output shaft or with the first power take-off shaft segment.

The system further comprises an idler cluster of gears mounted on an idler shaft. One of the idler gear of the idler cluster of gears is engaged with an output gear mounted on the output shaft, and other idler gear of the idler cluster is selectively engaged with the connecting gear.
In an embodiment, the first power take-off shaft segment and the second power take-off shaft segment are co-axial. The system further comprises an actuating lever arm operatively coupled to a lever of the tractor, the actuating lever arm is configured to engage the connecting gear with the idler cluster of gears, or slidably displace the connecting gear to couple the second power-take-off shaft to the first power take-off shaft segment.
In another embodiment, the first countershaft and the output shaft are co-axial, and are concentrically supported on the first power take-off shaft segment.
The input shaft is coupled to the first countershaft via a first pair of gears.
The second countershaft is coupled to the output shaft via a second pair of gears.
The drive shaft is concentrically supported on the input shaft.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
A power take-off system for a tractor, of the present disclosure, will now be described with the help of the accompanying drawing, in which:
Figure 1 illustrates a sectional view of the power take-off system for a tractor, in accordance with an embodiment of the present disclosure;
Figure 2 illustrates another sectional view of the power take-off system of Figure 1; and
Figure 3 illustrates a side view of the power take-off system of Figure 1.
LIST OF REFERENCE NUMERALS

100 - Power take-off system
105 -Housing
106 - Gearbox housing 110-Input shaft 115- Drive shaft 117- Third pair of gears
120 - First power take-off shaft segment
123 - First pair of gears
125 - First countershaft
130 - Second countershaft
133 - Second pair of gears
135 - Plurality of driving gears
140 - Plurality of driven gears
145 -Reverse gear
150-Output shaft
155 - Second power take-off shaft segment
160 - Connecting gear
165, 170 - Idler cluster of gears
175-Idler shaft
180- Output gear

185 – Actuating lever arm
DETAILED DESCRIPTION
The present disclosure envisages a power take-off system that has compact
configuration and eliminates the need of separate housing on a gearbox and a
5 complex actuation arrangement.
The power take-off system (hereinafter also referred to as system) of the present disclosure is now described with reference to Figure 1 through Figure 3.
Figure 1 illustrates a sectional view of a system 100, in accordance with an
embodiment of the present disclosure. Figure 2 illustrates another sectional view
10 of the system 100. Figure 3 illustrates a side view of the system 100.
The system 100 comprises an input shaft 110, a drive shaft 115, a first countershaft 125, a plurality of driving gears 135, a second countershaft 130, a plurality of driven gears 140, and an output shaft 150. All the aforementioned components of the system 100 are disposed within the housings 105, 106.
15 The input shaft 110 is coupled to the engine (not shown in figures) of a tractor
(not shown in figures), and is configured to receive power from the engine of the tractor. Further, the drive shaft 115 is concentrically mounted on the input shaft 110, and is configured to rotate with same rotational speed as that of the input shaft 110.
20 The first countershaft 125 is coupled to the input shaft 110, and is configured to
receive power therefrom. In an embodiment, the first countershaft 125 is coupled to the input shaft 110 via a first pair of gears 123. Further, the plurality of driving gears 135 is mounted on the first countershaft 125.
The second countershaft 130 is configured parallel to the first countershaft 125.
25 The plurality of driven gears 140 is mounted on the second countershaft 130. The
plurality of driven gears 140 is configured to selectively engage with the plurality
6

of driving gears 135. The selective engagement between the plurality of driving
gears 135 and the plurality of driven gears 140 helps to achieve different gear
transmission ratios. Further the system 100 includes a reverse gear 145 disposed
within the housing 105, and is configured to facilitate reverse gear transmission.
5 The reverse gear 145 is engaged with one of the driving gears 135 and one of the
driven gears 140 to achieve reverse gear transmission. The system 100 includes a shifter fork arrangement (not specifically labelled in figures) to facilitate selective engagement between the plurality of driving gears 135 and the plurality of driven gears 140.
10 The output shaft 150 is rotatably connected to the second countershaft 130 via a
second pair of gears 133.
The system 100 comprises a power take-off shaft disposed within the housing 105. The power take-off shaft is divided into two segments, i.e., a first power take-off shaft segment 120 and a second power take-off shaft segment 155.
15 The first power take-off shaft segment 120 is coupled to the input shaft 110, and
is configured to receive power therefrom. In an embodiment, the first power take-off shaft segment 120 is connected to the drive shaft 115 via a third pair of gears 117. As the first power take-off shaft segment 120 is directly coupled to the input shaft 110 via the drive shaft 115 and the third pair of gears 117, the first power
20 take-off shaft segment 120 receives power directly from the engine of the tractor.
In an embodiment, the first countershaft 125 and the output shaft 150 are arranged
co-axial, and are concentrically supported on the first power take-off shaft
segment 120 in a spaced apart configuration. This arrangement saves a lot of
space in the housing 105, thereby making the system 100 compact in
25 configuration.
The second power take-off shaft segment 155 is arranged parallel to the first power take-off shaft segment 120. More specifically, the first power take-off shaft segment 120 and the second power take-off shaft segment 155 are co-axial. The
7

second power take-off shaft segment 155 is configured to be selectively coupled
to the output shaft 150 or the first power take-off shaft segment 120. Further, the
second power take-off shaft segment 155 extends outwardly from the housing
106. Any farm equipment can be connected to the second power take-off shaft
5 segment 155.
When the second power take-off shaft segment 155 is coupled to the first power take-off shaft segment 120, the second power take-off shaft segment 155 directly receives power from the engine of the tractor.
When the second power take-off shaft segment 155 is coupled to the output shaft
10 150, the second power take-off shaft segment 155 receives power through the first
countershaft 125 and the second countershaft 130, i.e., through the driving gears 135 and the driven gears 140. Thus, different gear ratios can be achieved by coupling the second power take-off shaft segment 155 with the output shaft 150.
The system 100 includes a connecting gear 160 and an output gear 180. The
15 connecting gear 160 is slidably mounted on the second power take-off shaft
segment 155. Further, the output gear 180 is mounted on the output shaft 150. The connecting gear 160 is configured to facilitate coupling of the second power take¬off shaft segment 155 with the output shaft 150 or the first power take-off shaft segment 120.
20 The system 100 further includes an idler cluster of gears 165, 170 mounted on an
idler shaft 175. One idler gear of the idler cluster, i.e., the gear 165, is engaged with the output gear 180. The other idler gear, i.e., the gear 170, is selectively engageable with the connecting gear 160. The arrangement of the idler cluster 165, 170 is configured to facilitate the coupling of the second power take-off shaft
25 segment 155 with the output shaft 150.
The system 100 further comprises an actuating lever arm 185 operatively coupled to a lever (not shown in figures) configured in a driver cabinet of the tractor. The actuating lever arm 185 is configured to engage the connecting gear 160 with the
8

idler cluster of gears 165, 170, thereby connecting the second power take-off shaft segment 155 to the output shaft 150, or slidably displacing the connecting gear 160 towards the first power take-off shaft segment 120 to couple the second power take-off shaft segment 155 to the first power take-off shaft segment 120. 5 The connecting gear 160 is displaced such that a portion of the connecting gear 160 is in contact with the splines of the first power take-off shaft segment 120, while remaining portion is in contact with the splines of the second power take-off shaft segment 155. The actuating lever arm 185 is operated to achieve aforementioned connections by displacing the lever in predetermined directions.
10 To connect the second power take-off shaft segment 155 with the first power take¬off shaft segment 120, the actuating lever arm 185 displaces the connecting gear 160 towards the first power take-off shaft segment 120 such that the portion of the connecting gear 160 is in contact with the first power take-off shaft segment 120, while remaining portion is in contact with the second power take-off shaft
15 segment 155. In this arrangement, the second power take-off shaft segment 155 receives power directly from the engine.
The power transmission takes place in following manner.
Drive shaft 115 —►third pair of gears 117—► first power take-off shaft segment
120—► connecting gear 160 —► second power take-off shaft segment 155
20 —► farm equipment
In an embodiment, the gear ratio is 3.0625 when the second power take-off shaft
segment 155 receives power directly from the engine. The driving gear in the third
pair of gears 117 has 16 teeth, while the driven gear in the third pair of gears 117
has 49 teeth. It should be noted that the aforementioned ratio and number of teeth
25 are only for reference and can change as per application requirement.
To connect the second power take-off shaft segment 155 with the output shaft 150, the actuating lever arm 185 displaces the connecting gear 160 away from the first power take-off shaft 120 such that the connecting gear engages with the gear
9

170 of the idler cluster of gears 165, 170. In this arrangement, the second power take-off shaft segment 155 is coupled to the engine via the plurality of driving gears 135 and plurality of driven gears 140. Thus, varying gear ratios can be obtained at the second power take-off shaft segment 155 by selectively engaging 5 the plurality of driving gears 135 with the plurality of driven gears 140. The arrangement of the plurality of driving gears 135 and the plurality of driven gears 140 typically depicts a gearbox of the engine.
The power transmission takes place in following manner.
Input shaft 110 —►first pair of gears 123 —►first countershaft 125—► 10 plurality of driving gears 135 —► plurality of driven gears 140—► second
countershaft 130—► second pair of gears 133—►output shaft 150—►output gear 180—►idler cluster of gears 165, 170—► connecting gear 160—► second power take-off shaft segment 155—►farm equipment.
In an embodiment, when the second power take-off shaft segment 155 is
15 connected with the output shaft 150, four forward and one reverse gear
transmissions can be achieved. In another embodiment, the first gear transmission
ratio is 2.72, the second gear transmission ratio is 1.84, the third gear transmission
ratio is 1.18, the fourth gear transmission ratio is 0.88, and the reverse gear
transmission ratio is 2.00. It should be noted that the aforementioned ratios are
20 only for reference and can change as per application requirement.
The power take-off system of the present disclosure is compact in configuration. The system does not require separate housing on a gearbox as all the components can be accommodated in the housing of the gearbox. Further, the system eliminates the need of complex actuation arrangement, as the connecting gear is 25 used to connect the second power take-off shaft segment either directly with the engine or with the engine through gear reduction arrangement. As there are lesser components in the system, overall weight of the system is reduced and also servicing of the system becomes easy.
10

TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a power take-off system that:
• does not require separate housing on a gearbox;
5 • eliminates the need of complex configuration of actuating arrangement;
• has compact configuration; and
• is easy for servicing.
The foregoing disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The 10 description provided is purely by way of example and illustration.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The 15 examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The foregoing description of the specific embodiments so fully reveal the general 20 nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that 25 the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been
11

described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
Throughout this specification the word “comprise”, or variations such as
5 “comprises” or “comprising”, will be understood to imply the inclusion of a stated
element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression “at least” or “at least one” suggests the use of one or
10 more elements or ingredients or quantities, as the use may be in the embodiment
of the disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles or the like that has
been included in this specification is solely for the purpose of providing a context
for the disclosure. It is not to be taken as an admission that any or all of these
15 matters form a part of the prior art base or were common general knowledge in
the field relevant to the disclosure as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions
or quantities are only approximations and it is envisaged that the values
20 higher/lower than the numerical values assigned to the parameters, dimensions or
quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.
While considerable emphasis has been placed herein on the components and
component parts of the preferred embodiments, it will be appreciated that many
25 embodiments can be made and that many changes can be made in the preferred
embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein,
12

whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

WE CLAIM:
A power take-off system (100) for a tractor, said system (100) comprising:
an input shaft (110) configured to receive power from the engine of said tractor;
a first countershaft (125) coupled to said input shaft (110), and configured to receive power therefrom;
a plurality of driving gears (135) mounted on said first countershaft (125);
a second countershaft (130) configured parallel to said first countershaft (125);
a plurality of driven gears (140) mounted on said second countershaft (130), said plurality of driven gears (140) configured to selectively engage with said plurality of driving gears (135);
an output shaft (150) rotatably connected to said second countershaft (130);
Characterized in that,
a first power take-off shaft segment (120) is coupled to said input shaft (110), and is configured to receive power therefrom;
a second power take-off shaft segment (155) configured to be selectively coupled to said output shaft (150) or to said first power take-off shaft segment (120); and
a connecting gear (160) is slidably mounted on said second power take-off shaft segment (155), and is configured to facilitate coupling of said second power take-off shaft segment (155) with

said output shaft (150) or with said first power take-off shaft segment (120).
The power take-off system (100) as claimed in claim 1, wherein said system (100) comprises an idler cluster of gears (165, 170) mounted on an idler shaft (175), wherein one of the idler gear (165) of said idler cluster is engaged with an output gear (180) mounted on said output shaft (150) and other idler gear (170) of said idler cluster is selectively engaged with said connecting gear (160).
The power take-off system (100) as claimed in claim 1, wherein said first power take-off shaft segment (120) and said second power take-off shaft segment (155) are co-axial.
The power take-off system (100) as claimed in claim 2 and 3, wherein said system (100) comprises an actuating lever arm (185) operatively coupled to a lever of said tractor, said actuating lever arm (185) is configured to:
engage said connecting gear (160) with said idler cluster of gears (165, 170); or
slidably displace said connecting gear (160) to couple said second power-take-off shaft (155) to said first power take-off shaft segment (120).
The power take-off system (100) as claimed in claim 1, wherein said first countershaft (125) and said output shaft (150) are co-axial, and concentrically supported on said first power take-off shaft segment (120).
The power take-off system (100) as claimed in claim 1, wherein said input shaft (110) is coupled to said first countershaft (125) via a first pair of gears (123).

The power take-off system (100) as claimed in claim 1, wherein said second countershaft (130) is coupled to said output shaft (150) via a second pair of gears (133).
The power take-off system (100) as claimed in claim 1, wherein said system (100) comprises a drive shaft (115) concentrically supported on said input shaft (110), and said first power take-off shaft segment (120) is connected to said drive shaft (115) via a third pair of gears (117).