Description:FIELD
The present disclosure relates to power transmission systems used in vehicles and particularly relates to an arrangement for speed reduction and torque enhancement in agricultural vehicles like tractors.
BACKGROUND
The background information herein below relates to the present disclosure.
An arrangement for speed reduction and torque enhancement in a tractor is used to make the tractor functional for high torque agricultural applications such as super seeder, straw reaper or rotavator. The arrangement includes a planetary gear system configured between a transmission and a rear axle shaft of the tractor. The planetary gear system facilitates torque enhancement. However, the planetary gear system results in increased number of shafts and gear pairs. Moreover, the number of speed combinations achieved by the conventional arrangement is less. Thus, applications requiring different speed ratios are not possible with the conventional arrangement. To achieve distinct speed ratios, the transmission units must be modified significantly, which is costly and increases complexity.
Therefore, there is a need for an arrangement for speed reduction and torque enhancement in a vehicle, that alleviates the aforementioned drawbacks.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies are as follows:
An object of the present invention is to provide an arrangement for speed reduction and torque enhancement in a vehicle.
Another object of the present invention is to provide an arrangement for speed reduction and torque enhancement in a vehicle that offers torque enhancement and speed reduction.
Still another object of the present invention is to provide an arrangement for speed reduction and torque enhancement in a vehicle that eliminates the requirement of a planetary gear system.
Yet another object of the present invention is to provide an arrangement for speed reduction and torque enhancement in a vehicle that offers simplicity of construction by eliminating the number of gear pairs and shafts.
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 discloses an arrangement for speed reduction and torque enhancement in a vehicle comprising an auxiliary gear box fitted between the engine and the transmission unit, the auxiliary gear box including an input shaft driven by the engine, an input gear mounted on the input shaft, an output shaft configured to be in communication with the input shaft, an output gear mounted on the output shaft, and a cluster gear unit configured to be selectively engaged between the input gear and the output gear to enable speed reduction as well as torque enhancement of the vehicle.
In a preferred embodiment, a bevel gear is in communication with the transmission unit, with the bevel gear being positioned on the operative output side of the transmission unit.
In a preferred embodiment, a bull gear is in communication with the bevel gear to receive power from the bevel gear.
In a preferred embodiment, the bull gear is in communication with the rear axle shaft of the vehicle to enable torque enhancement.
In a preferred embodiment, the arrangement includes an idler gear unit being selectively engaged with a plurality of gear pairs of the transmission unit for reversing the direction of rotation on the operative output side of the transmission unit.
In a preferred embodiment, the auxiliary gear box is provided with a shift lever to selectively transmit power from the input shaft to the input gear, and from the input shaft directly to the output shaft.
In a preferred embodiment, in one operative configuration of the auxiliary gear box, the vehicle can be driven for a first set of speeds, when the shift lever couples the input shaft with the output shaft.
In a preferred embodiment, in another operative configuration of the auxiliary gear box, the vehicle can be driven for a second set of speeds, when the shift lever couples the input shaft with the input gear.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
An arrangement for speed reduction and torque enhancement in a vehicle, of the present disclosure, will now be described with the help of the accompanying drawings, in which:
Figure 1 illustrates a schematic of the arrangement of the present disclosure;
Figure 2 illustrates an isometric view of the arrangement of the Figure 1;
Figure 3 illustrates a schematic of the auxiliary gear box in a first configuration that facilitates a first set of speeds of the vehicle; and
Figure 4 illustrates a schematic of the auxiliary gear box in a second configuration that facilitates a second set of speeds of the vehicle;
LIST OF REFERENCE NUMERALS
10 – input shaft
12 – input gear
15 – shift lever
20 – cluster gear unit
22 – first gear
24 – second gear
30 – output shaft
32 – output gear
40 – transmission unit
60 – bevel gear
70 – bull gear
80 – rear axle shaft
90 – idler gear unit
100 – rear axle shaft of the present disclosure
102 – operative input side
104 – operative output side
1000 – arrangement
DETAILED DESCRIPTION
Embodiments of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms “a”, “an”, and “the” may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms “comprises”, “comprising”, “including”, and “having”, are open ended transitional phrases and therefore specify the presence of stated features, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be constructed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.
When an element is referred to as being “mounted on”, “engaged to”, “connected to”, or “coupled to” another element, it may be directly on, engaged, connected or coupled to the other element. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed elements.
The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, layer or section from another component, region, layer or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
Terms such as “inner”, “outer”, “beneath”, “below”, “lower”, “above”, “upper”, and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.
Referring to figures 1-4, an arrangement 1000 for speed reduction and torque enhancement in a vehicle is shown. The arrangement 1000 is configured to transmit mechanical power from an operative input side 102 of an engine to a transmission unit 40 of the vehicle. The arrangement 1000 comprises an auxiliary gear box 100 fitted between the engine and the transmission unit. The auxiliary gear box 100 includes an input shaft 10 driven by the engine of the vehicle, an input gear 12 mounted on the input shaft, an output shaft 30 configured to be in communication with the input shaft 10, an output gear 32 mounted on the output shaft 30, a cluster gear unit 20 configured to be selectively engaged between the input gear 12 and the output gear 32 to enable speed reduction as well as torque enhancement of the vehicle.
The arrangement 1000 further comprises a bevel gear 60 in communication with the transmission unit 40. The bevel gear 60 is positioned on an operative output side 104 of the transmission unit 40. A bull gear 70 is configured to be in communication with the bevel gear 60 to receive power from the bevel gear 60. The present disclosure discloses the bull gear 70 to be in communication with a rear axle shaft 80 of the vehicle. The bull gear 70 is typically a gear having large diameter that enhances torque output. The arrangement 1000 further includes an idler gear unit 90 being selectively engaged with a plurality of gear pairs of the transmission unit 40 for reversing the direction of rotation on the operative output side 104 of the transmission unit 40.
Referring to the figures 1, 2, and 4, the working of the arrangement 1000 will now be explained. The arrangement 1000 facilitates torque enhancement. As shown in the figure 4, power from the engine is received by the auxiliary gear box 100 via the input shaft 10. A shift lever 15 is provided on the auxiliary gear box 100 to selectively transmit power from the input shaft 10 to the input gear 12, and from the input shaft 10 directly to the output shaft 30.
Thus, the drive received from the input shaft 10 is supplied to the input gear 12 by shifting the shift lever 15 to engage with the input gear 12. A first set of speeds and a second set of speeds of the vehicle is facilitated by the auxiliary gear box 100. The first set of speeds is achieved when the shift lever 15 is shifted to engage with the output shaft 30. Hence, no speed reduction takes place in case of the first set of speeds of the vehicle. On the other hand, when the shift lever 15 is shifted to transmit the power of the input shaft 10 to the input gear 12, the second set of speeds of the vehicle is facilitated. In a first operative configuration of the arrangement 1000, the vehicle can be driven for the first set of speeds. In a second operative configuration of the arrangement 1000, the vehicle can be driven for the second set of speeds. The below table shows the speed combinations facilitated by the arrangement 1000 of the present disclosure.
In the operative second configuration, power is transmitted from the input shaft 10 to a first gear 22 mounted on the cluster gear unit. A second gear 24 mounted on the same shaft of the cluster gear unit then transfers the power to the output shaft 30. The output shaft 30 is in communication with the transmission unit 40, as shown in the figure 1. The power of the transmission unit 40 is supplied to the bevel gear 60 on the operative output side 104 of the transmission unit 40. The bevel gear 60 being in communication with the bull gear 70 transfers the power finally to the rear axle shaft 80 of the vehicle. Thus, the reduced speed and increased torque is facilitated by the arrangement 1000 of the present disclosure.
In an embodiment, the vehicle is a tractor used for carrying out agricultural applications.
Example:
The present disclosure aims to achieve a tractor speed of 1.85 kmph at rated engine speed of 2100 rpm, for the ARJUN 605 DI model. The rated power of the engine is 57 HP and the tractor has a tyre size of 16.9-28 inches. The rolling radius of the tractor is 0.67 m.
A comparison table of the prior art tractor with the present disclosure tractor is shown below.
PRIOR ART
Conventional ARJUN 605 DI model PRESENT DISCLOSURE
ARJUN 605 DI
Engine Rated Speed RPM 2100 2100
Rated Engine Power HP 57 57
Tyre Size 16.9-28 16.9-28
Rolling Radius m 0.67 0.67
Type of Speed reduction Mechanism Bull Gears Rotary gears and Bull gears
Speed at Low 1st L1 Gear: L1/A1 (kmph) 2.89 1.85
No. of Gears 8 Forward/
2 Reverse 16 Forward/
4 Reverse

The following speed combinations are facilitated by the arrangement of the present disclosure.
Gear Normal Speed
KMPH

First set of speeds Rotary Speed
KMPH with Gear Box ratio 1.51 at 2100 RPM engine speed
Second set of speeds Applications
Low 1st L1 2.89 1.85 1.With 1.59KMPH at 1800rpm Super Seeder & Straw Reaper
2. With 2.39KMPH at 1800rpm TMCH
3. Rotavator
Low 2nd L2 5.13 3.33 Rotavator
Low 3rd L3 7.36 4.79 Primary Tillage, Loader
Low 4th L4 11.35 7.38 Secondary Tillage Additional Speed
High 1st L5 8.28 5.38 Primary Tillage, Loader
High 2nd H1 14.67 9.72 Secondary Tillage
High 3rd H2 21.06 13.95 Haulage, Transportation
High 4th H3 32.48 21.51 Haulage, Transportation
Low Reverse 4.86 3.16
High Reverse 13.91 9.21

In the conventional arrangement, a planetary gear arrangement is disposed between the bevel gear 60 and the rear axle shaft 80. The planetary gear arrangement results in increased number of gear pairs and shafts, which is highly undesired, especially for low-cost tractor models that target low-income group. The present disclosure addresses this shortcoming by providing the bull gear 70. The bull gear 70 is a gear with a large diameter to facilitate torque enhancement.
The present disclosure offers an increased combination of gear speed combinations i.e., 16 forward and 4 reverse with the elimination of necessity of the planetary gear arrangement. Moreover, the present disclosure is significantly efficient than the prior art arrangement. The present disclosure eliminates complexity, facilitates improved manufacturability and avoids critical machining. In the example above, the arrangement 1000 resulted in 17 number of gear parts and 10 number of shafts, whereas the conventional arrangement requires 26 number of gear parts and 17 number of shafts.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
TECHNICAL ADVANCEMENT
The present disclosure described herein above has several technical advantages including, but not limited to, an arrangement for speed reduction and torque enhancement in a vehicle, which:
• offers torque enhancement and speed reduction;
• eliminates the requirement of a planetary gear system;
• increases ability of the tractor to be used for various agricultural applications;
• simplifies the construction by eliminating the number of gear pairs and shafts; and
• offers significant reduction in manufacturing cost of the vehicle.
The disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The 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 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 revealed the general 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 the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been 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 “comprises” or “comprising”, will be understood to imply the inclusion of a stated element or group of elements, but not the exclusion of any other element or group of elements.
The use of the expression “at least” or “at least one” suggests the use of one or 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 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 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.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many 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, 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.
, C , Claims:WE CLAIM:
1. An arrangement (1000) for speed reduction and torque enhancement in a vehicle, said arrangement (1000) configured to transmit mechanical power from an operative input side (102) of an engine to a transmission unit (40) of the vehicle, said arrangement (1000) comprising an auxiliary gear box (100) fitted between the engine and the transmission unit, said auxiliary gear box (100) including:
o an input shaft (10) driven by the engine;
o an input gear (12) mounted on said input shaft (10);
o an output shaft (30) configured to be in communication with said input shaft (10);
o an output gear (32) mounted on said output shaft (30);
o a cluster gear unit (20) configured to be selectively engaged between the input gear (12) and the output gear (32) to enable speed reduction as well as torque enhancement of the vehicle.
2. The arrangement (1000) as claimed in claim 1, wherein said arrangement (1000) includes a bevel gear (60) in communication with the transmission unit (40), said bevel gear (60) being positioned on an operative output side (104) of the transmission unit (40).
3. The arrangement (1000) as claimed in claim 2, wherein said arrangement (1000) includes a bull gear (70) in communication with said bevel gear (60) to receive power from said bevel gear (60).
4. The arrangement (1000) as claimed in claim 3, wherein said bull gear (70) is in communication with a rear axle shaft (80) of the vehicle to enable torque enhancement.
5. The arrangement (1000) as claimed in claim 1, wherein said arrangement (1000) includes an idler gear unit (90) being selectively engaged with a plurality of gear pairs of the transmission unit (40) for reversing the direction of rotation on the operative output side (104) of the transmission unit (40).
6. The arrangement (1000) as claimed in claim 1, wherein said auxiliary gear box (100) is provided with a shift lever (15) to selectively transmit power from the input shaft (10) to the input gear (12), and from the input shaft (10) directly to the output shaft (30).
7. The arrangement (1000) as claimed in claim 1, wherein in a first operative configuration of said arrangement (1000), the vehicle is able to be driven for a first set of speeds, when the shift lever (15) couples the input shaft (10) with the output shaft (30).
8. The arrangement (1000) as claimed in claim 1, wherein in a second operative configuration of said arrangement (1000), the vehicle is able to be driven for a second set of speeds, when the shift lever (15) couples the input shaft (10) with the input gear (12).

Dated this 12th day of January, 2023

_______________________________
MOHAN RAJKUMAR DEWAN, IN/PA – 25
of R.K.DEWAN & CO.
Authorized Agent of Applicant
TO,
THE CONTROLLER OF PATENTS
THE PATENT OFFICE, AT CHENNAI