FIELD OF INVENTION
This invention is related to a novel steering system with adjustable axle
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This is more reliable for heavy duty application than the prior art
available. In the present invention, Front Axle having additional features
of Adjustable axle & stoppers to adjust the turning radius of the vehicle.
BACKGROUND AMD PRIOR ART
As it is known, for several years the vast majority of four-wheel vehicles
of ail types have used a steering system designed in 1816 by a German
named Ackcrmann. "The design allows the inner wheel to angle more
sharply than the outer wheel in a turn, thus all four wheels have
approximately the same pivot point on a line extending out from the
center line of the rear axle."
Following design parameters are required to be considered before design
related to the actual field requirement & performance of the vehicle:
1. Caster: Helps to prevent wander.
2. Camber: Gives greater stability on uneven surfaces.
8. Toe-in: Tendency of cambered wheels to turn outward with large
turning cones turning around their apexes.
4. King Pin Inclination: Helps to reduce shocks.
Front wheels are generally the steered wheels for tractors & other
12 DEC 2013 -3- 3 8 2 1 D E L 1 2 !
vehicles. Front axle assembly consisting of three major components given
hercinbciow:
ORIGINAL
1. Centre Beam
2. Slider Assembly LH
3. Slider Assembly RH
The front axle comprising of U-section, ends of which are connected by
means of a plate. This leads to low load carrying capacity, which can only
be used for agricultural purpose.
Now, reference may be made to fig. 1 indicating location of failure at the
center point and also at spindle of the front axle assembly during fatigue
test. This failure leads to development of cracks.
Hence, the present invention has been proposed to address the aforesaid
drawbacks. If is applicable for heavy duty applications.
OBJECTS OF THE INVENTION
The main object of the invention is to provide a novel steering system
with adjustable axle assembly front for agriculture and construction
equipment's tractors to provide robust look, to increase traction force 85
load bearing capacity.
Another object of the invention is to provide a novel steering system with
adjustable axle assembly front for agriculture and construction
equipment's tractors to improve overall performance of two wheel device
u*c*». 3821^12,
A
.inner object of the invention is to provide a novel steering system with
adjustable axle assembly front for agriculture arid construction
equipment's tractors which is more cost effective and reliable for heavy
load applications. r^.HTfnM/M.
Further object of the invention is to provide a novel steering system with
adjustable axle assembly front for agriculture and construction
equipment's tractors which improves aesthetics of the vehicle.
SUMMARY OF THE INVENTION
/vccording to this invention, there is provided a novel steering system
with adjustable axle assembly front for agriculture and construction
equipments tractors comprising of an adjustable axle assembly front
connected with block front center on one side and block rear center on
other side wherein a support assembly front axle is provided in
connection with the block front center and block rear center.
EJS-C IKF DKBCMiPTlOM OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent
from the ensuing description when read in conjunction with the
accompanying drawing and wherein:
Fig. 1 shows: failure of conventional front axle assembly during fatigue
i ^ c- *
Fig. 2 shows: steering assembly for tractor according to the present
invention.
Fig. 2A shows: swing stopper of the present, invention.
Fig. 3 shows: block front center.
Fig. 4 shows: block rear center.
Fig. 5 shows: support assembly front axle.
12 DEC 2013
J R I G IN
Fig. 6 shows: axle assembly front axle.
Fig. 7 shows: center beam of axle assembly front.
Fig. 8 shows: left hand and right hand slider assembly.
Fig. 9 shows: three loading boundary conditions of axle assembly front.
Kig. 10 shows: stress contour of front axle assembly
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO
THE ACCQx^PANYING DRAWINGS
The present invention discloses a novel steering system with adjustable
axle assembly front, for agriculture and construction equipment's
tractors.
Now, reference may be made to fig. 2-4, in which an adjustable axle
assembly front axle (1) is connected with block front center (3) on one
side and block rear center (as shown in fig. 4) on other side by means of
a pin front axle (2).
The block rear center (4) is provided diametrically opposite to the block
Further, a support assembly front axle (4) as shown in figure 5 is
provided in connection with said block front axle (3) on one side and said
block rear axle (as shown in fig. 4) on other side.
Now, referring to fig. 6, in which the center beam (C) is assembled with a
slider assembly (LII and RH) at both ends. Said center beam, Left hand
slider assembly and right hand slider assembly are indicated in fig. 7 and
8 respectively.
12 DEC 2015' 3 8 2 1 DEL12!
C^TGINAL
The center beam having a plurality of welded components i.e. Bend plate
center beam, Back place center beam, Center pin housing, Bush, Side
bend plate, Washer support, Front support CP housing, Bottom support
CP housing, Back support CP housing & Power steering mounting
bracket. Rear side cylinder mtg. plate (R) is welded with the Centre Beam
lor Cylinder mounting.
Slider Assembly LH/RH: comprising of a plurality of welded
components i.e. Bend plate coller, back plate coller, spindle housing &
colter. Both sliders weld with coller to control turning radius of the
vehicle.
This Front Axle is designed for two wheel drive tractors with balance type
power steering arrangement used for agriculture as well as construction
v^ \A L4 i O 111 \s i i I S ,
The cross section of the front axle is square or rectangular to increase its
load carrying capacity.
Further, the slider assembly (LH and RH) is provided with four holes (II)
Instead of two in prior art. So that, the axle assembly front can be easily
track adjusted in two settings i.e. 52 inches and 56 inches as per the
vehicle operation requirements.
The collar (5) of the slider assembly is connected with spindle by means
of a screw preferably grub screw (7) and a nut preferably lock nut,
wherein the spindle is assembled with stub axle assembly (8).
«| 2 DEC 2013
ORIGIN
While taking turn, the screw acts as stopper. This helps in reducing the
turning radius in both sides.
Again, a cylinder (9) is mounted on the front ax!e; which is connected
with link assembly (10) on each side. This link assembly is connected
with the outer end of spindle through an arm (11). The balance type
power steering system comprises Steering rods with one end connected
with piston and other end connected to steering. Other end of steering
arm is connected to kingpins which along with wheel & hub assembly
arc fitted on front axle and are free to rotate along the longitudinal axis.
When operator turns the steering wheel, hydraulic oil supply guided by
the steering gear unit forces the movement of steering cylinder piston &
hence steering rods. This results in rotation of kingpins and wheel hub
assembly.
Further, there is provision of a swing stopper (12, fig. 2A)) on the front
axle assembly on both sides to prevent hitting of the support assembly
with the axle so as to avoid dent on the axle assembly.
CAE RESULTS: Axle Assembly Front is suitable in all three loading
boundary conditions (As shown in fig. 9). Fig. 9 indicates the following:
1. Contact define between central beam and extendable sliders.
2. Vertical downward Force ^=3500 kg
8. Frontal force 1000 kg on both sides.
/h Only vertical translation is fixed.
h. Only translation in vertical downward direction is free.
ORIGINAL
inec20i3
8
deduction in Stress level from 9 to 6 kg/mm2 , 22 to 14 kg/mm2 & 11
:o8.10kg/mm2 respectively in three boundary conditions (As shown in
rig. 10). Fig. 10 indicates the following:-
1. Stress - 11.0 kg/mm2
2. Stress = 6.7 kg/mm2
3. Existing design.
4. Stress - 8.10 kg/mm2
5. Stress - 6.4 kg/mm2
6. Stress = 6.8 kg/mm2
7. Modified design
PRODUCT EVALUATION & TESTING RESULTS
1. TEST PROCEDURE:
The steering geometry parameters of the subject tractor was
measured after setting toe in of 6 mm and tyre pressure was kept at
28 PSI, The steering geometry parameters were measured as per
The tests were conducted in actual mounting condition & at ambient
Temperature.
- nRlGiH^-
4 2 oec 2015
-9-
OO 1 HR 1 O I
i S^C!T! ^ siaisui / OBSERVATIONS:
The parameters measured are given below in the table:
Tractor Model
Tractor Sr. No.
Parameters
Tyre pressure,psi
i o e in, mm
l^hccl base(mm)
Front Track width(mm)
Rear Track width(mm)
Steering Turn Angle
L.I I.Turn, Degree
(Stopper position or gap)
R.I 1.Turn, Degree
(St poor Dosuior gap)
Turning Radius, mm
LIIS
RHS
axle Swing, Degree
Specified
28
4 to 12 mm
2240
1340
I, ^y1*^'^^
50-32
50-32
Without Brake
Steering Effort, Kg
Approx. 3800
Approx. 3800
7 to 8
FT 6 0 6 0 CE SPECIAL
TRACTOR
T2 195263
Measured
28_p_si_
6
2250
!330
NR
144 1
Inner
48.7
49.4
Outer
32.7
32.1
Without Brake
3825
3750
As per All
1.2
Lock to Lock
7
CONCLUSION: Based upon the test results, the performanee & measured
parameters meet the specifications.
ORIGINAL
: * .
yi DEC 2013
-10 '-J &
Results/ Observations:
^omponeics
Kroni. Axle
FT 65
(CK Special)
Front Axle
Fatigue Test Results
Specification i^oad iiCgi|
Present Invention
Existing
4900 Kgf
NO. of Cycles
281000
Test on hold
32000
failed
tractor.
New design is better than existing design of front axl
S i i i & | : s u LIS Features
Suitable for heavy duty application
Applicable to agriculture and construction equipment's tractors.
Adjustable axle and stoppers to reduce the turning radius of
vehicle, thereby requiring less space of turning.
Reduction in stress level on the front axle assembly.
Robust look, increases traction force & load bearing capacity.
improves overall performance of two wheel device agriculture &
construction equipment's tractors.
1 2 DEC 2013 i/fr*,'>, / yy M.
sJCLm jji ^^
11- ORIGIi
More cost effective and reliable lor hcav)
Improves aesthetics of the vehicle.
KJhcations.
is to be noted that the present invention is susceptible to
modifications, adaptations and changes by those skilled in the art. Such
variant embodiments employing the concepts and features of this
invention are intended to be within the scope of the present invention,
which is further set forth under the following claims:
12 DEC 2013 i2 3 8 2 1 D B l 2
mchMMi ORIGINAL
1. A novel steering system with adjustable axle assembly front for
agriculture and construction equipment's tractors comprising of an
adjustable axle assembly front connected with block front center on
one side and block rear center on other side wherein a support
assembly front axle is provided in connection with the block front
center and block rear center.
2. A novel steering system as claimed in claim 1, wherein the axle
assembly front comprising of a center beam assembled with a slider
assembly at each end, in which the cross section of the axle assembly
is square/rectangular to increase load carrying capacity.
3. A novel steering system as claimed in claim 1 or 2, wherein the slider
assembly is provided with atleast four holes for adjusting the axle
assembly front in two settings of 52" and 56".
1. A novel steering system as claimed in any of the preceding claims,
wherein the collar of the slider assembly is connected with spindle by
means of a screw preferably grub screw and a nut preferably lock nut,
wherein the spindle is assembled with stub axle assembly, in which
the screw acts as stopper to reduce the turning radius in both sides.
5. A novel steering system as claimed in any of the preceding claims,
wherein a cylinder is mounted on the front axle, which is connected
with link assembly on each side, in which the link assembly is
connected with the outer end of spindle through an arm.
6. A novel steering system as claimed in any of the preceding claims,
wherein a swing stopper is provided on the front axle assembly on
both sides to prevent hitting of the support assembly with the axle so
as to avoid dent on the axle assembly.
• W W *
kf*»T n ./nii .is
*2 0E 2013
13
DEU
7. A novel steering system as claimed in any of the preceding claims, is
associated with the advantageous features such as herein described.
8. A novei steering system with adjustable axle assembly front lor
agriculture and construction equipments tractors substantially as
herein described with reference to the accompanying drawings.