Claims:We Claim:
1. A single axis suspension system comprising:
• a fork (1) having a plurality of bottom end (2) and a top end (3) characterized in that wherein the bottom end (2) is having a slot (4) for mounting of the fork (1) on an axle of a wheel of a vehicle;
• a bottom tube (5) mounted on the top end (2) of the fork (1) characterized in that wherein an external surface (20) of the bottom tube (5) is provided with a thread (21) and an inner cylindrical surface (6) of the bottom tube (5) is provided with a thread (19);
• a pin (8) with a collar end (24) and a distal end (26) inserted coaxially in an inner cylindrical hole (23) of the bottom tube (5) using the collar end (24) maintaining position of the collar end (24) towards the top end (3) of the fork (1) characterized in that wherein the pin (8) is having a key slot (16) on its outer cylindrical face (25) and an external thread (29) at its distal end (26);
• A lock nut (7) with an externally threaded end (28) and a longitudinal key slot (22) on an inner cylindrical surface (30) of the lock nut (7) assembled to the bottom tube (5) using the thread on the inner cylindrical surface (6) of the bottom tube (5) to prevent disassembly of the pin (8) and the bottom tube (5) by stopping the collar end (24) of the pin (8) during its axial upward movement;
• A key (15) inserted in between the key slot (16) on the outer cylindrical face (25) of the pin (8) and the key slot (22) on an inner cylindrical surface of the lock nut (7) to restrict the rotational degree of freedom of the pin (8) with respect an axis (27) of the single axis suspension system;
• A spring tension nut (9) assembled to the bottom tube (5) using the thread (21) on the external surface (20) of the bottom tube (5);
• A shock absorber spring (10) coaxially rested on the spring tension nut (9);
• A steering column (12) with a collar (17) and an internal thread (18) on a bottom end (13) assembled coaxially to the distal threaded end (26) of the pin (8) using the internal thread (18) on the bottom end (13) of the steering column (12) and;
• A rubber boot (14) inserted coaxially on the steering column (12) to cover the single axis suspension system to protect it from the dust and for providing aesthetic look.
2. The single axis suspension system as claimed in claim 1, wherein the axis (27) of the single axis suspension system and axis of steering system are coincident.
3. The single axis suspension system as claimed in claim 1, wherein the pin (8) is having only translational degree of freedom along the axis (27) of the single axis suspension system.
4. The single axis suspension system as claimed in claim 1, wherein a length of the shock absorber spring (10), a length of the pin (9) and tension of the shock absorber spring (10) is adjusted to control a stroke length of the single axis suspension system during its operation.
5. The single axis suspension system as claimed in claim 2, wherein tension of the shock absorber spring (10) is adjusted using the spring tension nut (9). , Description:4. DESCRIPTION
FIELD OF THE INVENTION
This invention relates to an automotive vehicle’s suspension system. More particularly, relates to the automotive vehicle’s suspension system in which an axis of a steering system and an axis of the suspension system is coincident and is designed for rugged use and requiring less maintenance compared to telescopic a suspension system.
BACKGROUND OF THE INVENTION
A suspension system is used to provide safety and comfortable ride to passengers by damping of bumps, vibrations and noise because of the road conditions. The suspension system also contributes to the balancing and baking of vehicles. Use of a pair of fork tubes is most common as a front suspension system for the two-wheeled vehicle. Telescopic fork is a most commonly used form of front suspension system. Other fork designs such a girder forks, suspended on sprung parallel links and bottom leading link were common up to 1960.
In previous designs disclosed in the prior art, the fork suspension systems are limited to specific travel and dampening forces while in dampening motion is in process and are restricted up to certain limits of degree of freedom. In telescopic suspension system the amount of dampening is restricted up to certain limits of force, wherein the springer fork, the link from the wheel transmits the motion to the upper mounted shock-absorbers to dampen the shocks from the roads. In previously designed Earlesfront fork suspension, the shocks from the roads is directly transmitted to the shock absorbers while the leading arm pivoting to the stiff front forks.
The suspension system serves as a working system to reduce vibration when the vehicle is traveling on the road making ride comfortable. Suspension system used in the vehicle includes mono shock type and double shock type. Advantages of the mono shock suspension systems are; (i) maneuvering is more convenient, because the focus is on a single point load, that makes the mono shock system more comfortable than double mono shock, (ii) motorcycle performance using the mono shock suspension system is more stable than using the double shock suspension system as the focus is on the single point load in the middle of the swing arm, (iv) When the vehicle passes on the embankment sharp, uneven roads and ramps, mono shock remains stable, (v) it is more stylish. Because of above advantages most common application of the mono shock suspension system includes sport motorcycle used in racing.
SUMMARY OF THE INVENTION
A single axis suspension system as disclosed in the present patent application is comprising of a fork, a bottom tube, a pin, a lock nut, a key, a spring tension nut, a shock absorber spring, a steering column and, a rubber boot.
The fork with a plurality of bottom end and a top end is mounted on an axle of a wheel of a vehicle using a slot provided in a plurality of the bottom end. The bottom tube is rigidly joined to the top end of the fork using welding or mechanical fastening.
The pin is inserted coaxially in an inner cylindrical hole of the bottom tube using the collar end maintaining position of the collar end towards the top end of the fork.
The lock nut is assembled to the bottom tube using a thread on an inner cylindrical surface of the bottom tube to prevent disassembly of the pin and the bottom tube by stopping a collar end of the pin during its axial upward movement.
The key is inserted in between a key slot on an outer cylindrical face of the pin and a key slot on an inner cylindrical surface of the lock nut to restrict the rotational degree of freedom of the pin with respect an axis of the single axis suspension system.
The spring tension nut is assembled to the bottom tube using the thread on an external surface of the bottom tube.
The shock absorber spring is coaxially rested on the spring tension nut.
The steering column is assembled coaxially to a distal threaded end of the pin using an internal thread on a bottom end of the steering column.
The rubber boot is inserted coaxially on the steering column to cover the single axis suspension system to protect it from the dust and for providing aesthetic look.
The single axis suspension system as disclosed in the present patent application is assembled with a steering system in such a way that an axis of the single axis suspension system and an axis of steering system are coincident.
In the single axis suspension system as per discloser of the present patent application, the pin is having only translational degree of freedom along the axis of the single axis suspension system. Hence, the pin reciprocates in a vertical direction along the axis of the single axis suspension system and eliminates jolts and jerks from a road surface to a steering handle by transferring it to the shock absorber spring supported between the spring tension nut and the collar on the bottom end of the steering column.
A stroke length of the single axis suspension system during its operation can be controlled by selecting appropriate length of the shock absorber spring, appropriate length of the pin and tension of the shock absorber spring.
Tension of the shock absorber spring can be adjusted by setting the spring tension nut of the single axis suspension system according to the road condition. The steering column helps with the orientation of vehicle connected with the steering column neck.
In previous design of mono shock front suspension, the elimination of rotational motion is different from the invention disclosed in the present invention due to its key and slot arrangement that restricts the rotational degree of freedom of the pin, as described in the said invention.
In comparison to the girder fork front suspension system, the construction of the single axis suspension system as disclosed in the present invention is different as the axis of girder fork and the axis of steering is different in case of girder fork front suspension.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the invention as per the present patent application are described with reference to the following drawings in which like elements are labeled similarly. The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
FIG. 1 is a schematic diagram showing an exploded view of a single axis suspension system.
FIG. 2 is a schematic diagram showing a single axis suspension system.
List of designations/ reference numbers in figure
1 a fork
2 a plurality of bottom end of a fork (1)
3 a top end of a fork (1)
4 a slot (4) on a plurality of bottom end (2) of a fork (1)
5 a bottom tube
6 an inner cylindrical surface of a bottom tube (5)
7 a lock nut
8 a pin
9 A spring tension nut
10 a shock absorber spring
12 a steering column
13 a bottom end of a steering column (12) with internal thread
14 a rubber boot
15 a key
16 a longitudinal key slot on an outer cylindrical face (25) of a pin (8)
17 a collar on a bottom end (13) of a steering column (12)
18 an internal thread on a bottom end (13) of a steering column (12)
19 a thread on inner cylindrical surface (6) if a bottom tube (5)
20 an external surface of a bottom tube (5)
21 a thread on an external surface (20) of a bottom tube (5)
22 a key slot an inner cylindrical surface (30) of a lock nut (7)
23 an inner cylindrical hole of a bottom tube (5)
24 a collar end of a pin (8)
25 an outer cylindrical face of a pin (8)
26 a distal end of a pin (8)
27 an axis of a single axis suspension system
28 an externally threaded end of a lock nut (7)
29 an external thread on a distal end (26) of a pin (8)
30 an inner cylindrical surface of a lock nut (7)
DETAILED DESCRIPTION OF THE INVENTION
The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
The description of illustrative embodiments according to principles of the present invention is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description. In the description of embodiments of the invention disclosed herein, any reference to direction or orientation is merely intended for convenience of description and is not intended in any way to limit the scope of the present invention. Relative terms and directives thereof are for convenience of description only and do not require that the apparatus be constructed or operated in a particular manner unless explicitly indicated as such. Terms such as “attached,” “affixed,” “connected,” “coupled,” “interconnected,” and similar refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise. Moreover, the features and benefits of the invention are illustrated by reference to the exemplified embodiments. Accordingly, the invention expressly should not be limited to such exemplary embodiments illustrating some possible non-limiting combination of features that may exist alone or in other combinations of features; the scope of the invention being defined by the claims appended hereto.
As shown in FIG. 1, a single axis suspension system is comprising of a fork (1), a bottom tube (5), a pin (8), a lock nut (7), a key (15), a spring tension nut (9), a shock absorber spring (10), a steering column (12) and, a rubber boot (14).
As shown in FIG. 1, the fork (1) is having a plurality of bottom end (2) and a top end (3). The bottom end (2) of the fork (1) is provided with a slot (4) using which the fork (1) is mounted on an axle of a wheel of a vehicle. The bottom tube (5) is mounted on a top end (2) of the fork (1) and rigidly joined to the top end of the fork (1) using welding or mechanical fastening. A thread (21) is provided on an external surface (20) of the bottom tube (5). A thread (19) is provided on an inner cylindrical surface (6) of the bottom tube (5).
As shown in FIG. 1, the pin (8) is provided with a collar end (24) and a distal end (26). The pin (8) is provided with a longitudinal key slot (16) on its outer cylindrical face (25) and an external thread (29) at its distal end (26). The pin (8) is inserted coaxially in an inner cylindrical hole (23) of the bottom tube (5) using the collar end (24) maintaining position of the collar end (24) towards the top end (3) of the fork (1).
As shown in FIG. 1, the lock nut (7) is provided with an externally threaded end (28) and a longitudinal key slot (22) on an inner cylindrical surface (30). The lock nut (7) is assembled to the bottom tube (5) using the thread on the inner cylindrical surface (6) of the bottom tube (5) to prevent disassembly of the pin (8) and the bottom tube (5) by stopping the collar end (24) of the pin (8) during its axial upward movement.
As shown in FIG. 1, the key (15) is inserted in between the key slot (16) on the outer cylindrical face (25) of the pin (8) and the key slot (22) on an inner cylindrical surface of the lock nut (7) to restrict the rotational degree of freedom of the pin (8) with respect an axis (27) of the single axis suspension system.
As shown in FIG. 1, the spring tension nut (9) is assembled to the bottom tube (5) using the thread (21) on the external surface (20) of the bottom tube (5).
As shown in FIG. 1, the shock absorber spring (10) is coaxially rested on the spring tension nut (9).
As shown in FIG. 1, the steering column (12) is provided with a collar (17) and an internal thread (18) on a bottom end (13). The steering column (12) is assembled coaxially to the distal threaded end (26) of the pin (8) using the internal thread (18) on the bottom end (13) of the steering column (12).
As shown in FIG. 1, the rubber boot (14) inserted coaxially on the steering column (12). As shown in FIG. 2, the rubber boot (14) covers the single axis suspension system to protect it from the dust and for providing aesthetic look.
BEST METHOD OF WORKING OF THE INVENTION
The single axis suspension system as disclosed in the present patent application is assembled with a steering system in such a way that the axis (27) of the single axis suspension system and the axis of steering system are coincident.
In the single axis suspension system as per discloser of the present patent application, the pin (8) is having only translational degree of freedom along the axis (27) of the single axis suspension system. Hence, the pin (8) reciprocates in a vertical direction along the axis (27) of the single axis suspension system and eliminates jolts and jerks from a road surface to a steering handle by transferring it to the shock absorber spring (10) supported between the spring tension nut (9) and the collar (17) on the bottom end (13) of the steering column (12) ss shown in FIG. 1.
A stroke length of the single axis suspension system during its operation can be controlled by selecting appropriate length of the shock absorber spring (10), appropriate length of the pin (9) and tension of the shock absorber spring (10).
Tension of the shock absorber spring (10) can be adjusted by setting the spring tension nut (9) of the single axis suspension system according to the road condition. The steering column (12) helps with the orientation of vehicle connected with the steering column neck.