Claims:WE CLAIM:
1. A lubrication splash gear arrangement (100) for motor vehicle transmission, comprising of:
a gear housing (10) having a bottom portion (11) and provided with an oil sump (12) to receive lubricating oil;
a gear arrangement accommodated with the gear housing (10) and provided with Neutral (N), Forward (F) and Reverse (R) gears;
a main traction shaft (30) which is adapted to accommodate with the gear housing (10) and provided with end splines (31) at one end of its outer circumference;
a power transmission (PTO) shaft (20) positioned into the main traction shaft (30);
a sliding sleeve (40) positioned on the main traction shaft (30) and including a plurality of internal teeth (41) and a plurality of external dog teeth (42), where the plurality of internal teeth (41) of sliding sleeve (40) is in contact with the said end splines of the main traction shaft (30); and
a driven gear (50) loosely placed in an output shaft (51) which is positioned in the bottom portion (11) of gear housing (10), wherein the driven gear (50) is provided with a plurality of external teeth (52).
wherein rotation of the main traction shaft (30) rotates the sliding sleeve (40) by means of the plurality of internal teeth (41) of sliding sleeve (40), which rotates the driven gear (50) through the plurality of external dog teeth (42) of sliding sleeve (40) meshed with the plurality of external teeth (52) of the driven gear (50), therefore enables the lubricating fluid to rise up towards top portion of the transmission assembly thereby lubricating the top portion of the transmission.
2. The lubrication splash gear arrangement (100) as claimed in claim 1, wherein the sliding sleeve (40) is moved towards left and right sides for engaging reverse (R) and forward (F) gears, respectively.

3. The lubrication splash gear arrangement (100) as claimed in claim 1, wherein the driven gear (50) is performed as a lubrication gear.

4. The lubrication splash gear arrangement (100) as claimed in claim 3, wherein the lubrication gear is provided to splash the oil when the sliding sleeve (40) is in Neutral (N) or in engaged condition with Reverse (R)/Forward (F) gear.

5. The lubrication splash gear arrangement (100) as claimed in claim 1, wherein the power is transferred from an internal combustion (IC) engine the PTO shaft (20) as well as to the main traction shaft (30).

6. The lubrication splash gear arrangement (100) as claimed in claim 1, wherein the main traction shaft (30) is formed as hollow shape.

7. The lubrication splash gear arrangement (100) as claimed in claim 1, wherein dimension of the main traction shaft (30) is larger than the dimension of the PTO shaft (20).

8. The lubrication splash gear arrangement (100) as claimed in claim 1, wherein the oil is transferred by suction.

9. The lubrication splash gear arrangement (100) as claimed in claim 1, wherein the driven gear (50) is made of nylon material.

Dated this 14th day of February 2020 , Description:LUBRICATION SPLASH GEAR ARRANGEMENT FOR MOTOR VEHICLE TRANSMISSION
FIELD OF INVENTION
The present invention relates to the field of transmission systems in motor vehicles and more particularly, the invention relates to arrangement for lubrication splash gear which splashes oil to top portion of main traction shaft components in the transmission.
BACKGROUND OF INVENTION
In general, splash lubrication systems are known in modern transmissions, in particular to motor vehicle transmissions. Due to the rotation of the gear immersed in the oil of the oil sump, the oil is swiveled upwardly and the transmission case is filled with the oil mist which ensure proper lubrication of all points required to be lubricated.
Typically, the splash lubrication system is connected with certain disadvantages because under extremely low temperatures, the transmission oil assumes a relatively high viscosity and the splashing and/or the drag moment demanded from the transmission due to the very viscous oil tends in particular to brake synchronizing mechanisms of the transmission so heavily that unsynchronized shifting operations may occur. The latter may, however, cause considerable damage to the transmission because, the modern motor vehicle transmissions are not designed to stand unsynchronized faulty shifting without damage as the synchronizing mechanisms of modern transmissions normally ensure smooth gear changes.
In accordance with an operation of existing splash lubrication system for the inflow of lubricating oil from a pressurized oil circulation system to a clutch activation system which is supplied only in connection with and during the activation of the clutch, by means of a control sleeve at a clutch body, in such a fashion that the oil supply to the clutch is minimal or zero during normal operation but, during the clutching process, is increased or is at maximum. Up to now, there has been no possibility of providing a similar effect, which are comparable in their action and which depend on load, for splash-lubricated gears even though splash lubrication, primarily for reasons of cost, is desirable.
Hence, following prior art documents are disclosed to the transmissions with splash lubrication system.
US patent number 8,708,105 relates to a transmission with a case partially defining a cavity containing unpressurized fluid. The transmission case has a first feature configured to collect splashed fluid and a second feature configured to direct the collected fluid to a chamber at least partially formed by the transmission case. A cap connected to the transmission case has an opening and an orifice offset from the opening. Fluid flows from the chamber through the orifice to a component when fluid reaches a first level in the chamber and flows through the central opening through an axial passage in the shaft to other components when fluid reaches a second level in the chamber. Fluid flow is provided to components through an axial passage from both ends of a rotatable shaft, such as an input shaft. The axial passage may have a threaded end to pump oil away from the end and prevent backflow.
US patent number 9,429,224 relates to a high speed gearbox including a housing which encloses a rotating gear and a volume which contains oil and air. The gear has an outer first surface exposed to the volume and has a second surface exposed to the environment. A vent arrangement includes first and second passages formed in the gear. The second passage extends axially part way into the gear and has an outer end exposed to the second surface. The first passage extends radially from the first surface to the second passage. A check valve is mounted in the second passage and permits one-way flow of air from the volume to the environment.
US patent number 5,228,355 relates to a PTO unit for a transmission or the like including a housing having an interior chamber. A PTO drive shaft, mounted in the housing, includes a first drive connection for connection to an auxiliary device to provide power thereto. The PTO drive shaft includes a second drive connection. A lubricating pump is connected to the second drive connection of the drive shaft to be in driving engagement therewith. A laterally shiftable gear is mounted on the drive shaft between the first and second drive connections. A gear shift mechanism is provided for laterally shifting the shiftable gear between the first and second positions. An idler shaft, spaced from and parallel to the drive shaft, is mounted in the housing, and a cluster gear is provided for rotation on the idler shaft. The cluster gear includes a transmission driven gear and a pinion. The pinion engages the laterally shiftable gear in the first position thereof for driving the PTO shaft, and is disengaged therefrom when the laterally shiftable gear is in the second position. The idler shaft includes a hose for receiving a lubricant from the pump and injecting it into the housing to maintain the PTO unit lubricated only when the pinion is engaged with the laterally shiftable gear.
European patent number 2083196, relates to a lubrication system in a transmission, comprising a first toothed gear wherein at least one of the gaps of said first tooted gear is submerged in lubricant, and a second toothed gear that meshes in with said first toothed gear in a mesh point, wherein said lubrication system further comprises covering means that covers at least one of the gaps of said first toothed gear adjacent said mesh point and wherein said covering means is at least partly submerged in said lubricant so that said lubricant is conveyed to said mesh point by said covered gaps, and creating a local overpressure at said mesh point by meshing in a lubricant filled gap of said first tooted gear with said second tooted gear.
China patent application number 201932098 relates to a lubrication system for a power-output shaft of a crawler tractor comprises a gear box assembly, a rear axle assembly, a power-output shaft assembly, an oil inlet assembly, a spray lubrication adapter connector and an oil suction pipe assembly, wherein the gear box assembly is connected with the rear axle assembly through a bolt, the rear axle is connected with the power-output shaft assembly though a bolt, the spray lubrication connector is arranged on the upper portion of the power-output shaft assembly through bolted connection, the oil inlet assembly is connected with the spray lubrication assembly through a hollow bolt, and the oil suction pipe assembly is positioned on the lower half portion of the rear axle through flange connection. The lower portion of the box body of the gear box and the lower portion of the box body of the rear axle assembly are provided with communication pores A, and the upper portion of the box body of the rear axle assembly and the upper portion of the box body of the power-output assembly are provided with communication pores B. The lubrication system is compact in structure and reasonable in parts configuration, thereby resolving the problem that due to the self-structure limit the tractors cannot lubricate and heat when transmitting high power in the casing of a small power-output shaft, and improving the work reliability of the power-output shaft of the tractor.
Japanese patent number 3602413 relates to a lubricating device for tractor transmission. The device is performed with return oil from a control valve in a PTO transmission system made to blow but lubricating parts, such as bearings, slide parts, clutch discs, etc., via passages formed in an axial direction in a drive shaft of a hydraulic pack in the transmission system. The hydraulic pack in the driving transmission system is provided on a propeller shaft interlocked with and connected to an engine, passages and for hydraulic pressure to the hydraulic pack are formed in the axial and vertical directions in the propeller shaft, the PTO drive shaft is coupled with the propeller shaft, and the lubricating passages are formed in the PTO drive shaft and the propeller shaft; An oil sump is formed in a coupling part between the propeller shaft and the PTO drive shaft, and oil is made to blow out to the lubricating parts through the oil sump.
In order to solve the above mentioned problems, there is requirement for unique arrangement for lubrication splash gear with transmission comprising a gear housing forming an oil sump in its bottom portion, and PTO shaft provided with gears which are immersed in the oil at least partly when the oil sump is filled completely.
The information disclosed in this background of disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as acknowledgement or any form of suggestion that this information forms the prior art already known to person skilled in the art.
OBJECTIVE OF THE INVENTION
One or more problems of the conventional prior art may be overcome by various embodiment of the present invention.
It is the primary object of the present invention to provide sufficient fluid flow to the lubricate gear, rotating shafts, bearings and other components.
Another object of the present invention is to lubricate the main traction shaft needle bearing while the PTO shaft is engaged in live condition.
Yet another object of the present invention is to eliminate a need for a separate gear pump or rotor pump or similar pump.
Yet another object of the present invention is to provide an arrangement of splash-lubrication of gears, in a simple fashion, with minimal lubrication in standard operation but with full lubrication under load conditions.
Still yet another object of the present invention is to provide a simple and compact structure.
These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which the preferred embodiment of the present subject matter are illustrated.
SUMMARY OF THE INVENTION
One or more drawbacks of the conventional lubrication splash gear system and the additional advantages provided though the present invention relates to arrangement for lubrication splash gear which splashes the oil to main traction shaft components.
In an embodiment of the present subject matter relates to lubrication splash gear arrangement for motor vehicle transmissions, comprising of a gear housing having a bottom portion and provided with an oil sump to receive lubricating oil; a gear arrangement accommodated with the gear housing and provided with Neutral (N), Forward (F) and Reverse (R) gears; a main traction shaft accommodated with the gear housing and provided with end splines at one end of its outer circumference; a power transmission (PTO) shaft positioned into the main traction shaft; and a sliding sleeve positioned on the main traction shaft and including a plurality of internal teeth and a plurality of external dog teeth, where the plurality of internal teeth of sliding sleeve is in contact with the end splines of the main traction shaft and the plurality of external dog teeth of sliding sleeve is meshed with a plurality of external teeth of driven gear.
In accordance with an embodiment of the present subject matter relates to rotation of the main traction shaft rotating the sliding sleeve by means of the plurality of internal teeth of sliding sleeve, which rotates the driven gear through the plurality of external dog teeth of sliding sleeve meshing with the plurality of external teeth of the driven gear therefore in this arrangement enables the lubricating fluid to rise up towards top portion of the transmission assembly, thereby lubricating the top portion of the transmission.
To further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 illustrates exploded view of arrangement for lubrication splash gear with motor vehicle transmissions, in accordance with an embodiment of the present invention;
Figure 2: illustrates schematic view of sliding sleeve of lubrication splash gear arrangement, in accordance with an embodiment of the present invention; and
Figure 3: illustrates schematic view of lubrication splash gear arrangement for motor vehicle transmissions, in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS
The present invention as embodied by a “lubrication splash gear arrangement for motor vehicle transmission" succinctly fulfils the above-mentioned need(s) in the art. The present invention has objective(s) arising as a result of the above-mentioned need(s), said objective(s) being enumerated below. In as much as the objective(s) of the present invention are enumerated, it will be obvious to a person skilled in the art that, the enumerated objective(s) are not exhaustive of the present invention in its entirety, and are enclosed solely for the purpose of illustration. Further, the present invention encloses within its scope and purview, any structural alternative(s) and/or any functional equivalent(s) even though, such structural alternative(s) and/or any functional equivalent(s) are not mentioned explicitly herein or elsewhere, in the present disclosure. The present invention therefore encompasses also, any improvisation(s)/modification(s) applied to the structural alternative(s)/functional alternative(s) within its scope and purview. The present invention may be embodied in other specific form(s) without departing from the spirit or essential attributes thereof.
Throughout this specification, the use of the word "comprise" and variations such as "comprises" and "comprising" may imply the inclusion of an element or elements not specifically recited.
The present invention is thus directed to arrangement for lubrication splash gear which splashes the oil to main traction shaft components in the motor vehicle transmissions.
Referring may be made to Figure 1 illustrating exploded view of lubrication splash gear arrangement for motor vehicle transmissions, in accordance with an embodiment of the present invention. The lubrication splash gear arrangement (100) comprises a gear housing (10) having a bottom portion (11) and provided with an oil sump (12) to receive lubricating oil such that the filling level of oil sump (12) is to maintain the oil level incase of the oil level is low that a driven gear (50) does not get immersed in the oil.
In accordance with an embodiment of the present subject matter relates to the gear housing (10) which accommodates a gear arrangement that is provided with Neutral (N), Reverse (R) and Forward (R) gears, and also accommodates a power transmission (PTO) shaft (20) that is positioned into a hollow shaped main traction shaft (30). Further, the main traction shaft (30) and the PTO shaft (20) are acting as an input shaft, and an output shaft (32) that is disposed within the gear housing (10), where the input shaft is configured to receive the power from an internal combustion (IC) engine which is split and fed to the main traction shaft (30) as well as the PTO shaft (20).
Accordingly, the main traction shaft (30) is provided with end splines (31) at one end of outer circumference of the main traction shaft (30), where dimension of the main traction shaft (30) is larger than the dimension of PTO shaft (20) because of the main traction shaft (30) is encircling to the PTO shaft (20).
Referring may be made to Figure 2 illustrating schematic view of sliding sleeve for lubrication splash gear arrangement, in accordance with an embodiment of the present invention. The lubrication splash gear arrangement (100) includes a sliding sleeve (40) which is provided with a plurality of internal teeth (41) and a plurality of external dog teeth (42); and a driven gear (50) loosely positioned on an output shaft (51) which is placed at the bottom portion (11) of the gear housing (10). The driven gear (50) is provided with a plurality of external teeth (52).
Accordingly, the plurality of internal teeth (41) of sliding sleeve (40) is in contact with the end splines (31) of the main traction shaft (30), and the plurality of external dog teeth (42) of sliding sleeve (40) is meshed with the plurality of external teeth (52) of driven gear (50). The driven gear (50) is partly immersed in the oil sump (12) such that the oil is transferred from the oil sump (12) to parts of the main traction shaft (30) through the driven gear (50) by using suction mechanism.
In accordance with an embodiment of the present subject matter relates to the sliding sleeve (40) which is moved towards left side for engaging reverse (R) gear and moved towards right side for engaging forward (F) gear. After this movement of reverse (R) and Forward gears, the sliding sleeve (40) drives the driven gear (50) which in turn will splash the oil from the oil sump (12) towards the top portion of transmission.
Referring may be made to Figure 3 illustrating schematic view of lubrication splash gear arrangement for motor vehicle transmissions, in accordance with an embodiment of the present invention. While rotation of the main traction shaft (30) rotates the sliding sleeve (40) by means of the plurality of internal teeth (41) of sliding sleeve (40), which rotates the driven gear (50) through the plurality of external dog teeth (42) of sliding sleeve (40) meshed with the plurality of external teeth (52) of the driven gear (50). In this above arrangement enables the lubricating fluid to rise up towards the top portion of the transmission assembly, thereby lubricating the top portion of the transmission.
In addition, the driven gear (50) is made of nylon or other suitable materials. The driven gear (50) is performed as a lubrication gear which splashes the oil when the sliding sleeve (40) is in Neutral (N) or in engaged condition with Reverse (R) gear/Forward (F) gear.
In accordance with an advantage of this feature that this arrangement is to lubricate the main traction shaft needle bearing while the PTO shaft is engaged in live condition, and that the driven gear splashes the lubricating oil in the oil sump can be effected automatically. Further, the lubrication gear is high in transmission efficiency, free of energy loss generated by friction or hard impact generated between parts, good in lubrication effect and long in service life, and saves the lubricating oil.
It is to be understood that this invention is not limited to particular methodologies and materials described, as these may vary as per the person skilled in the art. Further, it is to be understood that the present invention is not limited to the methodologies and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods and materials are described, as these may vary within the specification indicated. It is also to be understood that the terminology used in the description is for the purpose of describing the particular embodiments only, and is not intended to limit the scope of the present invention. One skilled in the art will realise the disclosure may be embodied in other specific forms without departing from the disclosure or essential characteristics thereof.