FORM 2
THE PATENT ACT 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and rule 13]
TITLE: "A NEUTRAL GEAR POSITION SENSING SYSTEM AND A METHOD OF
ASSEMBLING THEREOF"
Name and address of the Applicant:
TATA MOTORS LIMITED, an Indian company having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001, Maharashtra, INDIA.
Nationality: INDIAN
The following specification particularly describes the nature of the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present disclosure relates to a neutral gear position sensing system. More particularly relates to a sensing system mounted on a top cover attached to the gear box housing which is needed for automotive transmission vehicle.
BACKGROUND OF PRESENT DISCLOSURE
In the conventional gear sensing system, the vehicle is provided with start stop feature which always need clutch sensor and neutral gear sensing for its start stop logic to be functional. As these inputs from sensor are provided to Logic controller and it results in start or stop of the vehicle.
Convention neutral gear sensing design consists of a sensor and magnet and it works on the principle of Hall Effect which is governed by the gap between sensor and magnet. And position of the magnet is defined by engaged gear status as it linked to gear shift lever either directly or through linkage.
In conventional system of neutral sensor mounting, a slot or a hole is provided on the gear box housing and has to be provided with tapping. Sensing mechanism is with in transmission housing where critical gap between sensor and magnet cannot be seen and slight deviation of magnet mounting surface or housing deviation can create fouling issue, which is not visible from outside.
Sometimes the conventional sensor is mounted on the gear shift lever housing and magnet is mounted on the gear shift lever. Here, sensor input is from direct movement of gear shift lever operated by driver.
Hence, there exist needs to develop a neutral gear position sensing system eliminating the gear sensing output inconsistency due to the gear shift lever play.

SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the innovated system as claimed in disclosure.
Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
The present disclosure provides a neutral gear position sensing system for an automotive transmission vehicle comprising, a magnetic field generator mounted on a selector shifter shaft of the vehicle for generating magnetic field, and a top cover mounted to gear box housing at vicinity of the magnetic field generator, wherein the top cover comprises a spigot hole to retain a detecting means, wherein the detecting means validates the position of gear lever based on the movement of the magnetic field generator.
A method of assembling a neutral gear position sensing system is disclosed as another aspect of the disclosure. The method of assembling comprises, mounting a magnetic field generator on a selector shifter shaft of the vehicle for generating magnetic field, and mounting a top cover to gear box housing at vicinity of the magnetic field generator, wherein a detecting means is mounted on a spigot hole provided in the top cover, wherein the detecting means displays the position of gear lever based on the movement of the magnetic field generator.
In one embodiment the present disclosure, the selector shifter shaft is displaced rotationally and vertically by a gear shifter cable and a gear selector cable respectively, wherein the displacement of the selector shifter shaft displaces the position of the magnetic field generator which is detected by the detecting means to sense the position of the gear lever.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use. further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
Fig. 1 illustrates perspective view of the neutral sensor mounting with gear box housing and gear
cables.
Fig. 2 illustrates side view of the neutral sensor mounting with gear box housing and gear cables according to the present disclosure.
Fig. 3 illustrates the top view of neutral sensor mounting showing selector shifter shaft, top cover and sensor.
Fig. 4 illustrates the isometric view of neutral sensor mounting showing selector shifter shaft, top cover and sensor.
Fig. 5 illustrates the side view of the top cover according to the present disclosure.
Fig. 6 illustrates the isometric view of the top cover according to the present disclosure.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION

The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
It is to be noted at this point that all of the above described components, whether alone or in any combination, are claimed as being essential to the invention, in particular the details depicted in the drawings and reference numerals in the drawings are as given below.

Referral Numerals Description
1 Top cover
la Spigot hole
lb Tapping
2 Magnet
3 Sensor
4 Screw
5 Selector Shifter Shaft
6 First Lever
7 Second Lever
8 Gear Shift Cable
9 Gear Box Housing

10 Gear Selector Cable
The present disclosure relates to a neutral gear position sensing system. More particularly relates to a sensing system mounted on a top cover (1) attached to the gear box.housing (9) which is needed for start stop vehicle. The present disclosure mainly aims in eliminating the inconsistency of the gear sensing output due to the gear shift lever play.
The present disclosure mainly consists of a detecting means, which is mounted on the top cover (1) integrated bracket, and magnetic field generator which is mounted on the selector shifter shaft (5). Sensing works on the Hall Effect principle. Horizontal and vertical movement provided to a selector shifter shaft (5) of the gear system of the vehicle results in the movement of magnetic field generator, based on which, the sensor (3) provides an output through sensor (3) cable to start stop controller. The selector shifter shaft (5) is linked to the shifter cable as well as selector cable. The movement provided to gear shifter lever is passed to shifter cable and selector cable based on the engagement of the gear. The top cover (1) is mounted on the gear box housing (9) using four bolts and is provided with an integrated bracket for accommodating the sensor (3).
Figs. 1 and 2, illustrates the perspective and the side view of the neutral sensor (3) mounting with gear box housing (9) and gear cables according to the present disclosure. The present disclosure is a combination of a detecting means mounted on a top cover (1) which is attached to the gear box housing (9) and a magnetic field generator mounted on a selector shifter shaft (5). By operating these two the position of the gear is validated with respect to a gear lever movement. The magnetic field generator used in the present disclosure is a magnet (2) and said magnet (2) is mounted on the selector shifter shaft (5). The magnet (2) is mounted on the outward extruded portion provided on the selector shifter shaft (5) so that the critical clearance zones between the sensor (3) and the magnet (2) is in the visible zone. A threaded portion is provided on the selector shifter shaft (5) in order to assemble the magnet (2). The movement provided to the selector shifter shaft (5) results in the movement of the magnet (2). The detecting means provided in the present disclosure is a sensor (3) and said sensor (3) is mounted on the top cover (!) which is in turn mounted on the gear box housing (9) of the vehicle. The top cover (1) is attached to the gear box housing (9) using plurality of bolts. A gap is maintained between the sensor (3) and the magnet (2) in order to ensure proper working of the technique disclosed in the

present disclosure. In the present disclosure, the magnet (2) is provided opposite to the integrated bracket of the top cover (1) whereas the sensing means is mounted inside the spigot hole (la) of the integrated bracket of the top cover (1).
In one embodiment the position of the gear is detected based on the combination of the detecting sensor (3) with respect to the position of the magnet (2).
Figs. 3-6, illustrate the top cover (1) assembly of the present disclosure. The disclosed top cover (1) is mounted on to the gear box housing (9) by plurality of bolts. The top cover (1) assembly disclosed in the present disclosure is provided with an integrated bracket, upon which a spigot hole (la) is formed. The top cover (1) is further provided with a tapping (lb) for connecting with the gear box housing (9). The spigot hole (la) formed on the integrated bracket of the top cover (1) accommodates the sensor (3) which acts as the detecting device. The sensor (3) consists of a sensor (3) cable to communication the desired output to a controller to validate the position of the gear. A threaded portion is provided on the selector shifter shaft (5) in order to assemble the magnet (2). The selector shifter shaft (5) consists of a first lever (6) which is linked to gear shift cable (8) at one end and a second lever (7) which is indirectly linked to gear selector cable (10). The selector shifter shaft (5) is displaced rotationally and vertically by a gear shifter cable and a gear selector cable (10) respectively, wherein the displacement provided to the selector shifter shaft (5) displaces the position of the magnetic field generator which is in turn detected by the detecting means to sense the position of the gear lever. The magnet (2) mounted on the selector shifter shaft (5) moves relative to the sensor (3) mounted on the top cover (1) of the gear box which is sensed by the Hall Effect principle. The sensed signal is further passed to the controller by sensing cable where it is processed to produce the desired output.
In one embodiment of the present disclosure the positional accuracy of the sensor (3) is taken care by spigot hole (la) provide on the top cover (1) integrated with bracket. And top cover (1) mounting pitch provides precision for the location of the spigot hole (1 a).
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from

the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof. Equivalents
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B. and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited

to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A. B. or C, etc.'; is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A. B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together. A and C together, B and C together, and/or A, B, and C together, etc.)- It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A;'or"B!'or"AandB.:'
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

We Claim:
1. A neutral gear position sensing system for an automotive transmission vehicle
comprising:
a magnetic field generator mounted on a selector shifter shaft (5) of the vehicle for generating magnetic field, and
a top cover (1) mounted to gear box housing (9) at vicinity of the magnectic field generator, wherein the top cover (1) comprises a spigot hole (la) to retain a detecting means, wherein the detecting means validates the position of gear lever based on the movement of the magnetic field generator.
2. The neutral gear position sensing system as claimed in claim 1, wherein the magnetic field generator is selected from a group comprising permanent magnet (2), solenoids and electro magnets.
3. The neutral gear position sensing system as claimed in claim 1, wherein the magnetic field generator is mounted on extruded portion of the selector shifter shaft (5).
4. The neutral gear position sensing system as claimed in claim 1, wherein the detecting means is selected from at least one of sensor (3) and transducer.
5. The neutral gear position sensing system as claimed in claim 1, wherein the selector shifter shaft (5) is displaced rotationally and vertically by a gear shifter cable and a gear selector cable (10) respectively, wherein the displacement of the selector shifter shaft (5) displaces the position of the magnetic field generator which is detected by the detecting means to sense the position of the gear lever.
6. The neutral gear position sensing system as claimed in claim 1, wherein the top cover (1) is provided with an integrated bracket having the spigot hole (la) to which the detecting means is mounted by a screw (4).

7. The neutral gear position sensing system as claimed in claim 1, wherein the top cover (1) is mounted on the gear box housing (9) using plurality of bolts.
8. A method of assembling a neutral gear position sensing system for an automotive vehicle comprising:
mounting a magnetic field generator on a selector shifter shaft (5) of the vehicle for generating magnetic field, and
mounting a top cover (1) to gear box housing (9) at vicinity of the magnectic field generator, wherein a detecting means is mounted on a spigot hole (la) provided in the top cover (1), wherein the detecting means validates the position of gear lever as per the movement of the magnetic field generator.