The present subject matter described herein, relates to a guide pipe assembly for manual gear transmission assembly of a vehicle. More particularly, the present invention relates to a guide pipe assembly for gear cable of a manual gear transmission assembly of a vehicle. The guide pipe assembly according to the present invention reduces noise during gear shifting and stops the wastage of grease during gear shifting to increase the overall life of the manual gear transmission assembly.
BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Transmission unit is a speed changing equipment installed in the automobiles. Transmission unit permits the engine to operate at a higher speed when its full power is needed and to slow down when less power is need. Inside the transmission unit are a series of variously sized, toothed gears which are used to change the speed of the vehicle.
[0004] Referring to figure 1 illustrating manual gear transmission assembly. In manual transmission, change in gear is actuated by applying certain pressure on a gear shift lever 101, which is usually provided between the front seats of a vehicle. The change in gear is done by a combination of a shift lever and a select lever provided on a shift tower 103 of the transmission unit 104. The shift lever and the select lever are connected to the gear shift lever 101 via. a shift cable 105 and a select cable 106, respectively. The shift cable 105 and the select cable 106 is in the form of a metallic rod.

[0005] One end of the shift cable 105 is connected to the gear shift lever 101 and the other end of the shift cable 105 is connected to the shift lever on the shift tower 103 of the transmission unit 104. Similarly, one end of the select cable 106 is connected to the gear shift lever 101 and the other end of the select cable 106 is connected to the select lever on the shift tower 103 of the transmission unit 104.
[0006] Referring to Figure 2 illustrating shift cable or select cable assembly
200 according to the existing prior art. The assembly 200 of shift cable and select cable is identical. Hence, hereinafter the shift cable and/or the select cable will be referred as "Gear Cable". The gear cable 201 is mounted on the gear shift lever side through an eye end 202. A casing cap 203 is provided to facilitate transmission of motion of gear shift lever assembly to the transmission unit. The casing cap 203 has a subassembly of a plastic guide pipe 204 which guides the gear cable 201 in the casing cap 203. While changing the gear, the gear cable 201 travels to and fro along the plastic guide pipe 204. Due to this, to and fro movement, the plastic guide pipe 204 and the gear cable 201 comes in contact with each other. This results in a plastic-metal interface between the gear cable
201 and plastic guide pipe 204 which leads to noise while changing the gear. Further, grease present on the inner cable, for smooth operation and to reduce the resistance, comes out of the guide pipe 204 while changing the gears. This leads to considerable wastage of grease which further leads to impeded gear changing.
[0007] Therefore, there is a need for a guide pipe assembly which can reduce the noise while shifting gear and stop the wastage of grease.
OBJECTS OF THE DISCLOSURE
[0008] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed herein below.
[0009] The principal object of the present invention is to provide a guide pipe assembly for gear cable of a gear shifting system in a vehicle.
[0010] Another object of the present invention is to provide a guide pipe assembly to reduce the noise while changing the gears in a vehicle.

[0011] Another object of the present invention is to provide a guide pipe assembly to retain the grease on the inner cable during changing of gears in a vehicle.
[0012] Another object of the present invention is to provide a guide pipe assembly having better endurance towards wear and tear.
[0013] These and other objects and advantages will become more apparent when reference is made to the following description and accompanying drawings.
SUMMARY
[0014] This summary is provided to introduce concepts related to a guide pipe assembly. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0015] In an embodiment, the present disclosure relates to a guide pipe assembly for a gear cable of a manual gear transmission assembly of a vehicle. The guide pipe assembly includes a guide pipe and a hollow rubber cap. The guide pipe has a plurality of serrations at outer surface of the first end. The hollow rubber cap defines a cylindrical structure and a tapered structure with a plurality of slots. The cylindrical structure is integrally provided over the plurality of serrations of the guide pipe.
[0016] In an aspect, the hollow rubber cap is over-molded on the guide pipe by injection molding process.
[0017] In an aspect, a ring structure extending inward towards the centre of the hollow rubber cap is provided in between the cylindrical structure and the tapered structure.
[0018] In an aspect, the plurality of slots are U-shaped and are provided on the circumference of a first end of the hollow rubber cap.

[0019] In an aspect, the plurality of slots, having U-shape, makes an angle (a) with the plane towards the centre of the hollow rubber cap.
[0020] In an aspect, inner diameter of the hollow rubber cap is greater than diameter of the gear cable.
[0021] In an aspect, inner diameter of the ring is greater than diameter of the gear cable.
[0022] In an aspect, the inner diameter of the ring is smaller than inner diameter of the guide pipe.
[0023] In an aspect, the ring provides a clearance fit to the gear cable.
[0024] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and methods that are consistent with the subject matter as claimed herein, wherein:
[0026] Fig. 1 illustrates a manual gear transmission assembly according to the existing art;
[0027] Fig. 2 illustrates a shift cable or select cable assembly according to the existing art;
[0028] Figure 3 a illustrates a guide pipe assembly according to one of the embodiments of present subject matter;
[0029] Fig. 3b illustrates a guide pipe and a hollow rubber cap according to one of the embodiments of present subject matter;

[0030] Fig. 4 illustrates a gear cable assembly according to one of the embodiments of the present subject matter;
[0031] Fig. 5 illustrates sectional view of guide pipe assembly showing serrations according to one of the embodiments of present subject matter; and
[0032] Fig. 6 illustrates inner section of guide pipe with rubber cap according to one of the embodiments of present subject matter.
[0033] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily 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
[0034] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the present disclosure as defined by the appended claims.
[0035] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a"," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be

further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0037] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0038] In addition, the descriptions of "first", "second", and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include at least one of the features, either explicitly or implicitly.
[0039] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0040] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.

[0041] Referring to figure 3a and 3b illustrating a guide pipe assembly and components of the guide pipe assembly, respectively, for gear cable of a manual gear transmission system of a vehicle, according to one of the embodiments of the present subject matter. The guide pipe assembly 300, according to the present invention, comprises a guide pipe 301 and a hollow rubber cap 302. The guide pipe 301 has a plurality of serrations 303 provided on first end of the guide pipe 301. The hollow rubber cap 302 defines a cylindrical structure 304 and a tapered structure 305 with plurality of slots 306 provided on the circumference of first end. The plurality of slots 306 are U-shaped, making an angle (a) with the plane towards the centre of the hollow rubber cap, to retain the grease in the gap. The angle (a) is in the range of 5° to 10°. Further, a ring structure (501) extending towards the centre of the hollow rubber cap is provided in between the cylindrical structure and the tapered structure.
[0042] Referring to figure 4 illustrating a gear cable assembly 400 according to one of the embodiments of the present subject matter. A casing cap 203 is mounted on mating part of a gear shift lever assembly to facilitate transmission of shift motion and select motion from gear shift lever assembly to shift lever and select lever of shift tower. Second end of the guide pipe 300 is fixed in the casing cap 203 and the hollow rubber cap 302 is over-molded on the first end of the guide pipe 301 by injection molding process. The plurality of serrations 303 provided on the first end of the guide pipe 301 enhance the gripping of the hollow rubber cap 302 over the guide pipe 301 and eradicate the possibility of detachment of hollow rubber cap 302.
[0043] The first end of the hollow rubber cap 302 accommodates the gear cable 201. The second end of the hollow rubber cap 302 is over-molded with the first end of the guide pipe 301, such that, the cylindrical structure 304 of the hollow rubber cap 302 covers the plurality of serrations 303 provided on the first end of the guide pipe 301. The ring structure provided between the cylindrical structure 305 and the tapered structure 305 provides clearance between the guide pipe 301 and the gear cable 201. This eliminates the contact between the guide

pipe 301 and the gear cable 201, which leads to dampening of noise while changing the gear. Further, during the to and fro movement of the gear cable 201, the plurality of slots (U-shaped) 306 helps in retaining the grease in the gaps. The other end of the gear cable 201 is connected to the gear shift lever assembly through a eye end 202, respectively.
[0044] Referring to figure 5 and 6 illustrating sectional view of plurality of serrations 303 of guide pipe 301 and inner section of the guide pipe 301 with the hollow rubber cap 302. The inner diameter of the hollow rubber cap 302 is greater than diameter of the gear cable 201 to accommodate the gear cable 201. Further, the inner diameter of the ring is greater than diameter of the gear cable 201 to provide a clearance fit between the ring () and the gear cable 201 such that the gear cable 201 does not come in the contact of the guide pipe 301. Furthermore, the inner diameter of the ring () is smaller than inner diameter of the guide pipe.
[0045] The guide pipe assembly 300, according to the present subject matter, has better endurance towards wear and tear. As there is clearance provided by the ring, the noise created by contact of the guide pipe 301 and gear cable 201 is eliminated. Further, the changing of gear can be done smoothly for a long time as the present guide pipe 301 assembly retains the grease on the inner cable.
[0046] 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 "A and B."
[0047] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments,

versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

WE CLAIM:

1.A guide pipe assembly (300) for a gear cable (201) of a manual gear
transmission assembly of a vehicle, the guide pipe assembly (300)
comprising:
a guide pipe (300) having a plurality of serrations (303) at outer surface of first end;
a hollow rubber cap (302) defining a cylindrical structure (304) and a tapered structure (305) with a plurality of slots (306), wherein the cylindrical structure (304) is integrally provided over the plurality of serrations (303) of the guide pipe (301).
2. The guide pipe assembly (300) as claimed in claim 1, wherein the hollow rubber cap (302) is over-molded on the guide pipe (301) by injection molding process.
3. The guide pipe assembly (300) as claimed in claim 1, wherein a ring structure (501) extending toward center of the hollow rubber cap (302) is provided in between the cylindrical structure (304) and the tapered structure (305), the ring structure (501) provided adjacent to the first end of the guide pipe (301).
4. The guide pipe assembly (300) as claimed in claim 1, wherein the plurality of slots (306) are U-shaped and are provided on the circumference of a first end of the hollow rubber cap (302).
5. The guide pipe assembly (300) as claimed in claim 1, wherein the plurality of slots (306), having U-shape, makes an angle (a) with the plane towards the center of the hollow rubber cap (302).

6. The guide pipe assembly (300) as claimed in claim 1, wherein an inner diameter of the hollow rubber cap (302) is greater than diameter of the gear cable (201).
7. The guide pipe assembly (300) as claimed in claim 1, wherein inner diameter of the ring (501) is greater than diameter of the gear cable (201).
8. The guide pipe assembly (300) as claimed in claim 1, wherein the inner diameter of the ring is smaller than inner diameter of the guide pipe (301).
9. The guide pipe assembly (300) as claimed in claim 2, wherein the ring provides a clearance fit to the gear cable (201).