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Rear Suspension Unit For One Step Entry (E+1) Front Engine Bus
Abstract: REAR SUSPENSION UNIT FOR ONE STEP ENTRY (E+l) FRONT ENGINE PASSENGER VEHICLE FIELD OF THE INVENTION The present invention relates to a suspension unit for low floor vehicles. More specifically relates to the suspension unit for a rear axle of a one step entry front engine passenger vehicle. BACKGROUND OF THE INVENTION A variety of vehicles are in use today. A number of configurations are available for various needs. One particular type of vehicle is low floor bus. Such vehicles are typically characterized by a passenger aisle that is relatively low to the ground so that the people entering or leaving the vehicle is easy and quick. Most of the standard buses have a floor height of about 1150mm, which is entry plus three steps (E+3). The entry plus two steps (E+2) have a typical floor height of about 890mm. Globally and in India, low floor buses with a floor height of at least 650mm or less are usually rear engine driven, and hence come with step seating on the rear side of the bus. These suites western countries with few passengers and good roads and where there are no conductors for ticketing. In India buses are overcrowded, with more standees, roads are bumpy and the bus conductor used to walk from the front to rear end of the vehicle a hundred times every shift. Also from operational standpoint, rear engine buses are considered more expensive to operate than front engine buses. In current scenario, front engine buses have more than two stepped entry (E+2) which have a minimum step dimension of about 250mm each. It poses difficulty to senior citizens and disabled passengers for move in or move out of city buses. With this constraint, city buses take more time at bus stops for the ingress and egress of passengers, especially in peak traffic hours. All the low floor buses with floor height of at least 650 mm or less are with rear engines. The rear engine buses come with entry plus one step (E+l) platform as shown in the Fig 1, which reduces the ingress and egress time, but is substantially higher cost. Rear engine buses have steps in rear saloon area causing additional fatigue to conductor when moves to collect fare and give tickets. Maintenance cost of rear engine vehicles is higher when compared to front engine vehicle and further more cooling efficiency is achieved with front engine vehicles. While low floor buses serves an important purpose, the necessary design constrains put limitations on other portions of the vehicle. One challenging aspect has been to design an appropriate suspension for the vehicle wheels. In the field of transport, the stability of the vehicle on uneven grounds is guaranteed by using suspension units which are applied to each wheel by connecting the wheel hub to vehicle frame, as it is widely known in the art. Typical packaging space available for drive axle used on rear engine low floor buses do not permit the use of same suspension unit to front engine one step entry buses by meeting all other legal requirements and boundary conditions. This calls for new rear suspension design packaged within the boundary conditions. The rear suspension unit for E+ 2 front engine passenger vehicles is shown in Fig 2, in which compound links (1) are mounted on top of the rear axle. The same rear suspension unit is not suitable for E+l front engine passenger vehicle. The suspension unit for the one step entry front engine bus has to be designed separately in order to maintain the uniform floor height from front to the rear of the vehicle and also meeting the legal requirements as per bus body code (AIS 052). SUMMARY OF THE INVENTION It is the feature of the present invention to realize a suspension unit for vehicle, particularly rear suspension of one step entry (E+l) front engine passenger vehicle, which is effective and compact, in order to make gangway wider, comfortable and having uniform floor height from front of the vehicle to rear of the vehicle. The principal object of the present invention is to realize a new rear suspension unit for one step entry front engine low floor passenger vehicle, preferably bus, by maintaining a uniform floor in the bus saloon area i.e. from front of the vehicle to the rear of the vehicle. Further object of the present invention is to provide a sufficient space for packaging of different suspension components by meeting legal requirements of bus body code and also boundary conditions. Other object of the present invention is to provide a minimum gangway width of at least 450 mm after the one step entry for one step entry (E+1) front engine passenger bus. Another object of the present invention is the mounting of compound links or V links (1) at the bottom of rear axle without compromising on ground clearance. Another object is to design a front cross member (11) and parallel link bracket (6) in a unique sense to provide the clearance to propeller shaft that transmits power from the gear box to rear axle. A rear suspension unit for one step entry (E+1) low floor buses realized according to the present invention comprises a rear axle (7) suspended by plurality of air bellows (8) arranged between air bellow bracket (10) and a cow horn (9) which is mounted on both the ends of the rear axle (7); shock absorbers (12) being mounted between cow horn (9) and each one of air bellow bracket (10); pluralities of right and left rods called parallel links (5), one end of each of which is secured to chassis by means of a parallel link bracket (6) and other ends of which are being secured on rear axle (7) and arranged in the longitudinal direction of said chassis frame; plurality of lower rods called compound links or v link (1), one end of each is being secured to said chassis and other ends are being secured pivotally to a position near the center section of said rear axle (7) and mounted on the bottom of the rear axle so as to form V shape; and an anti roll bar (13), one end of which is being secured pivotally to the cowhorn in the longitudinal direction and other is being secured to said chassis. A preferred exemplary embodiment is explained in greater detail in the following description and illustrated in the drawings. BRIEF DISCRIPTION OF THE ACCOMPANYING DRAWINGS The advantages and features of the invention will become more clearly apparent from the following description which refers to the accompanying drawings given as non-restrictive examples only and in which: Fig.l shows the configuration of one step entry (E+1) bus with rear engine in accordance with the prior art. Fig 2 shows a perspective view of rear suspension unit for two step entry (E+2) front engine bus in accordance with the prior art. Fig.3 shows a frame assembly for low floor front engine bus comprises frame side members, cross members and outriggers to support engine. Fig 4 shows the configuration of one step entry (E+1) bus with front engine, and with front door placed in front of the front axle in accordance with the present invention. Fig 5 shows the configuration of one step entry (E+1) bus with front engine, and with front door placed behind the front axle in accordance with the present invention. Fig 6 shows a perspective view of rear suspension unit for one step entry (E+1) front engine bus in accordance with the present invention. Fig 7 shows expanded view of arrangement of a front cross member and a parallel link bracket in accordance with the present invention. Fig 8 shows different disassembled components of rear air suspension unit for one step entry (E+1) front engine bus in accordance with the present invention. DETAILED DISCRIPTION OF THE INVENTION The present invention will be described herein below with reference to the accompanying drawings. The following description is of exemplary embodiment of the invention only, and is not limit the scope, applicability or configuration of the invention. Rather, the following description is intended to provide a convenient illustration for implementing various embodiments of the invention. As will become apparent, various changes may be made in the function and arrangement of the structural features described in these embodiments without departing from the scope of the invention as set forth herein. It should be appreciated that the description herein may be adapted to be employed with alternatively configured devices having different shaped, components, and the like and still fall within the scope of the present invention. Thus the detailed description herein is presented for purposes of illustration only and not of limitation. The rear suspension unit for a one step entry (E+l) front engine passenger vehicle is described in the following description. The vehicle is referred herein and exemplified as a passenger bus in the figures; however, the vehicle may comprise any commercial or industrial vehicle. The different aspects described herein below with reference to accompanying drawings relates to realizing a rear suspension unit for the one step entry (E+l) passenger bus with the engine mounted at the front of the vehicle by maintaining a uniform floor in the bus saloon area i.e. from front of the vehicle to the rear of the vehicle. A frame assembly of front engine low floor bus with E+l platform is shown in Fig 3. This frame assembly is suitable for supporting engine, wherein said frame assembly is being formed by two longitudinal frame side members (2), plurality of transverse cross members (3) and outriggers (4). The cross members (3) are provided for supporting the drive train components like engine, propeller shaft and for fixing all other related necessary items. Doors at different locations can be positioned by properly choosing the cross members location, without changing the frame assembly. Outriggers are the extensions of the cross members and bolted together with the frame side member and cross members instead of traditional welding. This results in weight saving and ease of manufacturing. Outriggers form the base for the floor space in cases of low floor buses and they are provided with tapered plates for easy integration of frame with the body structure. In accordance with one aspect of the present invention, layout of rear suspension unit is shown in Fig.6. The rear suspension unit for one step entry low floor buses designed according to the present invention comprises a rear axle (7) suspended by plurality of air bellows (8) arranged between air bellow bracket (10) and a cow horn (9) which is mounted on both the ends of the rear axle (7); shock absorbers(12) being mounted between cow horn (9) and each one of air bellow bracket (10); pluralities of right and left rods called parallel links (5), one end of each of which is secured to chassis by means of a parallel link bracket (6) and other ends of which are being secured on rear axle (7) and arranged in the longitudinal direction of said chassis frame; plurality of lower rods called compound links or v link (1), one end of each is being secured to said chassis and other ends are being secured pivotally to a position near the center section of said rear axle (7) and mounted on the bottom of the rear axle (7) so as to from V shape; and an anti roll bar (13), one end of which is being secured pivotally to the cowhorn (9) in the longitudinal direction and other is being secured to said chassis. Compound links are mounted below the rear axle without comprising on ground clearance. Mounting compound links at the bottom of rear axle increases the roll moment arm which in turn increases the tendency of the vehicle to roll in cornering. In order to avoid this, present invention is provided with the anti roll bar (13) having higher diameter. The rear suspension unit further comprises a front cross member (11), wherein said cross member (11) is lowered to a position so as to have the enough ground clearance with propeller shaft. This cross member is then connected to air bellow brackets (10) from the side and parallel link bracket (6) from the top as shown in Fig 7. The different disassembled suspension components of rear suspension unit and other components associated with suspension components is shown in Fig 8. These components comprises rear axle (7), parallel links (5), parallel link mounting bracket (6), compound links (1), Compound link mounting bracket (17), front cross member (11), rear cross member (16), U bolt (15), outrigger (4), air bellow brackets (10), cow horn (9), anti roll bar (13) and shock absorbers (12). Air bellows (8) referred herein and exemplified as two bellows in figures; however, the rear suspension may be provided with multiple air bellows, preferably four air bellows. Air bellows (8) are being capable of supporting vertical loads by isolating the road undulations from getting transferred to vehicle chassis. Air bellow is preferably a snap on type. Parallel and compound links are being capable of supporting braking/acceleration loads, whereas the cornering/lateral loads are also taken by compound links. The anti roll bar (13) is being mounted to resist the vehicle roll during high speed cornering and shock absorbers (12) are arranged to dampen suspension travel. In accordance with other aspect of the present invention, air bellow brackets (10) mounted at both the ends of said frame axle are flushed with the frame top, and floor on air bellow brackets is extended. The flushing of air spring brackets is achieved by mounting the same in such a way that top of said bracket and said chassis frame are positioned at same level. The flushing of air bellow brackets and the arrangement of air bellows allows achieving minimum gangway width of at least 450 mm or more after entry plus one step, thereby maintaining uniform floor from front to rear of the vehicle at a height of about 650mm or less from the ground. In accordance with other aspect of the present invention, different door configurations of one step entry front engine bus is shown in Fig 4 and Fig 5. Fig 4 shows the configuration of one step entry (E+l) bus with front engine, and with front door placed in front of the front axle in accordance with the present invention. Fig 5 shows the configuration of one step entry (E+l) bus with front engine, and with front door placed behind the front axle in accordance with the present invention. 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. It is evident to those skilled in the art that although the invention herein is described in terms of specific embodiments thereof, there exist numerous alternatives, modifications and variations of the invention. It is intended that all such modifications and alterations be included insofar as they come within the spirit and scope of the invention as claimed or the equivalents thereof. Hence all variations, modifications and alternatives that fall within the broad scope of the appended claims come under gamut of the invention. We claim: 1. A suspension unit for rear wheels of one step entry front engine passenger vehicle comprises: a rear axle and plurality of air bellows arranged between an air bellow bracket and a co whorn; plurality of compound links, wherein one end of each said compound link is being secured to a chassis frame and other end of each link is being secured pivotally to said rear axle by suitable means, wherein said compound links are mounted on bottom of said rear axle; and a front cross member connected to said air bellow bracket from the side and a parallel link bracket from the top. 2. The suspension unit as claimed in claim 1, wherein said air bellows are arranged at both the ends of said rear axle. 3. The suspension unit as claimed in claim 1, wherein other end of said compound links are being secured pivotally to a position near the center section of said rear axle. 4. The suspension unit as claimed in claim 1, wherein said cow horn is mounted on said rear axle 5. The suspension unit as claimed in claim 1, wherein comprises shock absorber mounted between said cowhorn and said air bellow bracket. 6. The suspension unit as claimed in claim 1, said suspension unit comprises plurality of parallel links, one end of which is being secured to said chassis by means of said parallel link bracket and the other end of which are secured to said rear axle, wherein said parallel links are arranged in longitudinal direction of said chassis frame. 7. The suspension unit as claimed in claim 1, wherein said compound links are arranged to form a V shape. 8. The suspension unit as claimed in claim 1, wherein said suspension unit comprises an anti roll bar, one end of said anti roll bar is secured pivotally to the cowhorn in the longitudinal direction and other is secured to said chassis. 9. The suspension unit as claimed in claim 1, wherein said air bellow brackets are flushed with the chassis. 10. The suspension unit as claimed in claim 1, wherein said air bellow is preferably a snap on 10 ABSTRACT REAR SUSPENSION UNIT FOR ONE STEP ENTRY (E+1) FRONT ENGINE PASSENGER VEHCILE A rear suspension unit for one step entry (E+1) low floor buses realized according to the present invention comprises a rear axle suspended by plurality of air bellows arranged between pluralities of air bellow brackets and a cow horn which is mounted on both the ends of the rear axle; shock absorbers being mounted between cow horn and each one of air bellow brackets; pluralities of right and left rods called parallel links, one end of each of which is secured to chassis by means of a parallel link bracket and other ends of which are being secured on rear axle and arranged in the longitudinal direction of said chassis frame; plurality of lower rods called compound links or v link, one end of each is being secured to said chassis and other ends are being secured pivotally to a position near the center section of said rear axle and mounted on the bottom of the rear axle so as to from V shape; and an anti roll bar, one end of which is being secured pivotally to the cowhorn in the longitudinal direction and other is being secured to said chassis. Fig 6 11
Notices, Deadlines & Correspondence
Patent Information
Applicants
ASHOK LEYLAND LIMITED
WHEELS INDIA LIMITED
Inventors
1. AMOL PRASAD SHARMA
2. VIJAYKUMAR V
3. E RAJA
Specification
REAR SUSPENSION UNIT FOR ONE STEP ENTRY (E+l) FRONT ENGINE PASSENGER VEHICLE
FIELD OF THE INVENTION
The present invention relates to a suspension unit for low floor vehicles. More specifically relates to the suspension unit for a rear axle of a one step entry front engine passenger vehicle.
BACKGROUND OF THE INVENTION
A variety of vehicles are in use today. A number of configurations are available for various needs. One particular type of vehicle is low floor bus. Such vehicles are typically characterized by a passenger aisle that is relatively low to the ground so that the people entering or leaving the vehicle is easy and quick. Most of the standard buses have a floor height of about 1150mm, which is entry plus three steps (E+3). The entry plus two steps (E+2) have a typical floor height of about 890mm.
Globally and in India, low floor buses with a floor height of at least 650mm or less are usually rear engine driven, and hence come with step seating on the rear side of the bus. These suites western countries with few passengers and good roads and where there are no conductors for ticketing. In India buses are overcrowded, with more standees, roads are bumpy and the bus conductor used to walk from the front to rear end of the vehicle a hundred times every shift. Also from operational standpoint, rear engine buses are considered more expensive to operate than front engine buses.
In current scenario, front engine buses have more than two stepped entry (E+2) which have a minimum step dimension of about 250mm each. It poses difficulty to senior citizens and disabled passengers for move in or move out of city buses. With this constraint, city buses take more time at bus stops for the ingress and egress of passengers, especially in peak traffic hours. All the low floor buses with floor height of at least 650 mm or less are with rear engines. The rear engine buses come with entry plus one step (E+l) platform as shown in the Fig 1, which reduces the
ingress and egress time, but is substantially higher cost. Rear engine buses have steps in rear saloon area causing additional fatigue to conductor when moves to collect fare and give tickets. Maintenance cost of rear engine vehicles is higher when compared to front engine vehicle and further more cooling efficiency is achieved with front engine vehicles.
While low floor buses serves an important purpose, the necessary design constrains put limitations on other portions of the vehicle. One challenging aspect has been to design an appropriate suspension for the vehicle wheels. In the field of transport, the stability of the vehicle on uneven grounds is guaranteed by using suspension units which are applied to each wheel by connecting the wheel hub to vehicle frame, as it is widely known in the art.
Typical packaging space available for drive axle used on rear engine low floor buses do not permit the use of same suspension unit to front engine one step entry buses by meeting all other legal requirements and boundary conditions. This calls for new rear suspension design packaged within the boundary conditions.
The rear suspension unit for E+ 2 front engine passenger vehicles is shown in Fig 2, in which compound links (1) are mounted on top of the rear axle. The same rear suspension unit is not suitable for E+l front engine passenger vehicle. The suspension unit for the one step entry front engine bus has to be designed separately in order to maintain the uniform floor height from front to the rear of the vehicle and also meeting the legal requirements as per bus body code (AIS 052).
SUMMARY OF THE INVENTION
It is the feature of the present invention to realize a suspension unit for vehicle, particularly rear suspension of one step entry (E+l) front engine passenger vehicle, which is effective and compact, in order to make gangway wider, comfortable and having uniform floor height from front of the vehicle to rear of the vehicle.
The principal object of the present invention is to realize a new rear suspension unit for one step entry front engine low floor passenger vehicle, preferably bus, by maintaining a uniform floor in the bus saloon area i.e. from front of the vehicle to the rear of the vehicle.
Further object of the present invention is to provide a sufficient space for packaging of different suspension components by meeting legal requirements of bus body code and also boundary conditions.
Other object of the present invention is to provide a minimum gangway width of at least 450 mm after the one step entry for one step entry (E+1) front engine passenger bus.
Another object of the present invention is the mounting of compound links or V links (1) at the bottom of rear axle without compromising on ground clearance.
Another object is to design a front cross member (11) and parallel link bracket (6) in a unique sense to provide the clearance to propeller shaft that transmits power from the gear box to rear axle.
A rear suspension unit for one step entry (E+1) low floor buses realized according to the present invention comprises a rear axle (7) suspended by plurality of air bellows (8) arranged between air bellow bracket (10) and a cow horn (9) which is mounted on both the ends of the rear axle (7); shock absorbers (12) being mounted between cow horn (9) and each one of air bellow bracket (10); pluralities of right and left rods called parallel links (5), one end of each of which is secured to chassis by means of a parallel link bracket (6) and other ends of which are being secured on rear axle (7) and arranged in the longitudinal direction of said chassis frame; plurality of lower rods called compound links or v link (1), one end of each is being secured to said chassis and other ends are being secured pivotally to a position near the center section of said rear axle (7) and mounted on the bottom of the rear axle so as to form V shape; and an anti roll bar (13), one end of which is being secured pivotally to the cowhorn in the longitudinal direction and other is being secured to said chassis.
A preferred exemplary embodiment is explained in greater detail in the following description and illustrated in the drawings.
BRIEF DISCRIPTION OF THE ACCOMPANYING DRAWINGS
The advantages and features of the invention will become more clearly apparent from the following description which refers to the accompanying drawings given as non-restrictive examples only and in which:
Fig.l shows the configuration of one step entry (E+1) bus with rear engine in accordance with the prior art.
Fig 2 shows a perspective view of rear suspension unit for two step entry (E+2) front engine bus in accordance with the prior art.
Fig.3 shows a frame assembly for low floor front engine bus comprises frame side members, cross members and outriggers to support engine.
Fig 4 shows the configuration of one step entry (E+1) bus with front engine, and with front door placed in front of the front axle in accordance with the present invention.
Fig 5 shows the configuration of one step entry (E+1) bus with front engine, and with front door placed behind the front axle in accordance with the present invention.
Fig 6 shows a perspective view of rear suspension unit for one step entry (E+1) front engine bus in accordance with the present invention.
Fig 7 shows expanded view of arrangement of a front cross member and a parallel link bracket in accordance with the present invention.
Fig 8 shows different disassembled components of rear air suspension unit for one step entry (E+1) front engine bus in accordance with the present invention.
DETAILED DISCRIPTION OF THE INVENTION
The present invention will be described herein below with reference to the accompanying drawings.
The following description is of exemplary embodiment of the invention only, and is not limit the scope, applicability or configuration of the invention. Rather, the following description is intended to provide a convenient illustration for implementing various embodiments of the invention. As will become apparent, various changes may be made in the function and arrangement of the structural features described in these embodiments without departing from the scope of the invention as set forth herein. It should be appreciated that the description herein may be adapted to be employed with alternatively configured devices having different shaped, components, and the like and still fall within the scope of the present invention. Thus the detailed description herein is presented for purposes of illustration only and not of limitation.
The rear suspension unit for a one step entry (E+l) front engine passenger vehicle is described in the following description. The vehicle is referred herein and exemplified as a passenger bus in the figures; however, the vehicle may comprise any commercial or industrial vehicle.
The different aspects described herein below with reference to accompanying drawings relates to realizing a rear suspension unit for the one step entry (E+l) passenger bus with the engine mounted at the front of the vehicle by maintaining a uniform floor in the bus saloon area i.e. from front of the vehicle to the rear of the vehicle.
A frame assembly of front engine low floor bus with E+l platform is shown in Fig 3. This frame assembly is suitable for supporting engine, wherein said frame assembly is being formed by two longitudinal frame side members (2), plurality of transverse cross members (3) and outriggers (4). The cross members (3) are provided for supporting the drive train components like engine, propeller shaft and for fixing all other related necessary items. Doors at different locations can be positioned by properly choosing the cross members location, without changing the frame assembly. Outriggers are the extensions of the cross members and bolted together with the frame side member and cross members instead of traditional welding. This results in weight saving and ease of manufacturing. Outriggers form the base for the floor space in cases of low floor buses and they are provided with tapered plates for easy integration of frame with the body structure.
In accordance with one aspect of the present invention, layout of rear suspension unit is shown in Fig.6. The rear suspension unit for one step entry low floor buses designed according to the present invention comprises a rear axle (7) suspended by plurality of air bellows (8) arranged
between air bellow bracket (10) and a cow horn (9) which is mounted on both the ends of the rear axle (7); shock absorbers(12) being mounted between cow horn (9) and each one of air bellow bracket (10); pluralities of right and left rods called parallel links (5), one end of each of which is secured to chassis by means of a parallel link bracket (6) and other ends of which are being secured on rear axle (7) and arranged in the longitudinal direction of said chassis frame; plurality of lower rods called compound links or v link (1), one end of each is being secured to said chassis and other ends are being secured pivotally to a position near the center section of said rear axle (7) and mounted on the bottom of the rear axle (7) so as to from V shape; and an anti roll bar (13), one end of which is being secured pivotally to the cowhorn (9) in the longitudinal direction and other is being secured to said chassis. Compound links are mounted below the rear axle without comprising on ground clearance. Mounting compound links at the bottom of rear axle increases the roll moment arm which in turn increases the tendency of the vehicle to roll in cornering. In order to avoid this, present invention is provided with the anti roll bar (13) having higher diameter.
The rear suspension unit further comprises a front cross member (11), wherein said cross member (11) is lowered to a position so as to have the enough ground clearance with propeller shaft. This cross member is then connected to air bellow brackets (10) from the side and parallel link bracket (6) from the top as shown in Fig 7.
The different disassembled suspension components of rear suspension unit and other components associated with suspension components is shown in Fig 8. These components comprises rear axle (7), parallel links (5), parallel link mounting bracket (6), compound links (1), Compound link mounting bracket (17), front cross member (11), rear cross member (16), U bolt (15), outrigger (4), air bellow brackets (10), cow horn (9), anti roll bar (13) and shock absorbers (12).
Air bellows (8) referred herein and exemplified as two bellows in figures; however, the rear suspension may be provided with multiple air bellows, preferably four air bellows. Air bellows (8) are being capable of supporting vertical loads by isolating the road undulations from getting transferred to vehicle chassis. Air bellow is preferably a snap on type.
Parallel and compound links are being capable of supporting braking/acceleration loads, whereas the cornering/lateral loads are also taken by compound links. The anti roll bar (13) is being
mounted to resist the vehicle roll during high speed cornering and shock absorbers (12) are arranged to dampen suspension travel.
In accordance with other aspect of the present invention, air bellow brackets (10) mounted at both the ends of said frame axle are flushed with the frame top, and floor on air bellow brackets is extended. The flushing of air spring brackets is achieved by mounting the same in such a way that top of said bracket and said chassis frame are positioned at same level. The flushing of air bellow brackets and the arrangement of air bellows allows achieving minimum gangway width of at least 450 mm or more after entry plus one step, thereby maintaining uniform floor from front to rear of the vehicle at a height of about 650mm or less from the ground.
In accordance with other aspect of the present invention, different door configurations of one step entry front engine bus is shown in Fig 4 and Fig 5. Fig 4 shows the configuration of one step entry (E+l) bus with front engine, and with front door placed in front of the front axle in accordance with the present invention. Fig 5 shows the configuration of one step entry (E+l) bus with front engine, and with front door placed behind the front axle in accordance with the present invention.
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. It is evident to those skilled in the art that although the invention herein is described in terms of specific embodiments thereof, there exist numerous alternatives, modifications and variations of the invention. It is intended that all such modifications and alterations be included insofar as they come within the spirit and scope of the invention as claimed or the equivalents thereof. Hence all variations, modifications and alternatives that fall within the broad scope of the appended claims come under gamut of the invention.
We claim:
1. A suspension unit for rear wheels of one step entry front engine passenger vehicle
comprises:
a rear axle and plurality of air bellows arranged between an air bellow bracket and a co whorn;
plurality of compound links, wherein one end of each said compound link is being secured to a chassis frame and other end of each link is being secured pivotally to said rear axle by suitable means, wherein said compound links are mounted on bottom of said rear axle; and a front cross member connected to said air bellow bracket from the side and a parallel link bracket from the top.
2. The suspension unit as claimed in claim 1, wherein said air bellows are arranged at both the ends of said rear axle.
3. The suspension unit as claimed in claim 1, wherein other end of said compound links are being secured pivotally to a position near the center section of said rear axle.
4. The suspension unit as claimed in claim 1, wherein said cow horn is mounted on said rear axle
5. The suspension unit as claimed in claim 1, wherein comprises shock absorber mounted between said cowhorn and said air bellow bracket.
6. The suspension unit as claimed in claim 1, said suspension unit comprises plurality of parallel links, one end of which is being secured to said chassis by means of said parallel link bracket and the other end of which are secured to said rear axle, wherein said parallel links are arranged in longitudinal direction of said chassis frame.
7. The suspension unit as claimed in claim 1, wherein said compound links are arranged to form a V shape.
8. The suspension unit as claimed in claim 1, wherein said suspension unit comprises an anti roll bar, one end of said anti roll bar is secured pivotally to the cowhorn in the longitudinal direction and other is secured to said chassis.
9. The suspension unit as claimed in claim 1, wherein said air bellow brackets are flushed with the chassis.
10. The suspension unit as claimed in claim 1, wherein said air bellow is preferably a snap on
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 865-CHE-2012 POWER OF ATTORNEY 07-03-2012.pdf | 2012-03-07 |
| 2 | 865-CHE-2012 FORM-3 07-03-2012.pdf | 2012-03-07 |
| 3 | 865-CHE-2012 FORM-2 07-03-2012.pdf | 2012-03-07 |
| 4 | 865-CHE-2012 FORM-1 07-03-2012.pdf | 2012-03-07 |
| 5 | 865-CHE-2012 DRAWINGS 07-03-2012.pdf | 2012-03-07 |
| 6 | 865-CHE-2012 DESCRIPTION(PROVISIONAL) 07-03-2012.pdf | 2012-03-07 |
| 7 | 865-CHE-2012 CORRESPONDENCE OTHERS 07-03-2012.pdf | 2012-03-07 |
| 8 | 865-CHE-2012 POWER OF ATTORNEY 27-03-2012.pdf | 2012-03-27 |
| 9 | 865-CHE-2012 FORM-1 27-03-2012.pdf | 2012-03-27 |
| 10 | 865-CHE-2012 CORRESPONDENCE OTHERS 27-03-2012.pdf | 2012-03-27 |
| 11 | 865-CHE-2012 FORM-5 21-02-2013.pdf | 2013-02-21 |
| 12 | 865-CHE-2012 FORM-2 21-02-2013.pdf | 2013-02-21 |
| 13 | 865-CHE-2012 FORM-18 21-02-2013.pdf | 2013-02-21 |
| 14 | 865-CHE-2012 CORRESPONDNECE OTHERS 21-02-2013.pdf | 2013-02-21 |
| 15 | 865-CHE-2012 DRAWINGS 21-02-2013.pdf | 2013-02-21 |
| 16 | 865-CHE-2012 DESCRIPTION (COMPLETE) 21-02-2013.pdf | 2013-02-21 |
| 17 | 865-CHE-2012 CLAIMS 21-02-2013.pdf | 2013-02-21 |
| 18 | 865-CHE-2012 ABSTRACT 21-02-2013.pdf | 2013-02-21 |
| 19 | 865-CHE-2012-FER.pdf | 2018-06-13 |
| 20 | 865-CHE-2012-OTHERS [20-07-2018(online)].pdf | 2018-07-20 |
| 21 | 865-CHE-2012-FER_SER_REPLY [20-07-2018(online)].pdf | 2018-07-20 |
| 22 | 865-CHE-2012-COMPLETE SPECIFICATION [20-07-2018(online)].pdf | 2018-07-20 |
| 23 | 865-CHE-2012-CLAIMS [20-07-2018(online)].pdf | 2018-07-20 |
| 24 | 865-CHE-2012-ABSTRACT [20-07-2018(online)].pdf | 2018-07-20 |
| 25 | 865-CHE-2012-PatentCertificate02-01-2023.pdf | 2023-01-02 |
| 26 | 865-CHE-2012-IntimationOfGrant02-01-2023.pdf | 2023-01-02 |
Search Strategy
| 1 | strstegy_01-11-2017.pdf |