Design and Analysis of Pedal Box with Braking System

International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume: 3 | Issue: 3 | Mar-Apr 2019 Available Online: www.ijtsrd.com e-ISSN: 2456 - 6470
@ IJTSRD | Unique Paper ID – IJTSRD23413 | Volume – 3 | Issue – 3 | Mar-Apr 2019 Page: 1446
Design and Analysis of Pedal Box with Braking System
Md. Hameed1, B. Praveen Kumar1, B. Rohit2, B. Surya Sai2, G. Sai Kiran2
1Assistant Professor, 2 UG Student
1,2Department of Mechanical Engineering, Guru Nanak Institute of Technology, Telangana, India
How to cite this paper: Md. Hameed | B.
Praveen Kumar | B. Rohit | B. Surya Sai |
G. Sai Kiran "Design and Analysis of
Pedal Box with Braking System"
Published in International Journal of
Trend in Scientific Research and
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(ijtsrd), ISSN: 2456-
6470, Volume-3 |
Issue-3, April 2019,
pp.1446-1449, URL:
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ABSTRACT
A design process for an automotive pedal box system is presented in this paper.
The work begins with a review of research carried out on pedal box system. It is
followed by the process of designing a complete pedal box system. Reverse
engineering process by using a steel pedal box system by use of MS Plate. The
Pedal box design with proper pedal ratio and the use of single brake for both
front and rear braking is designed.
KEYWORDS: Automotive pedal box system, Reverse EngineeringProcess andMS
Plate
1. INTRODUCTION
Pedal Box is a recent innovation in the racing world mainly
in the formula cars. The main purpose of pedal box is to
provide comfort and efficient working for the driver. Pedals
are mounted into the box type structure rather than
mounting directly to the Chassis. One more use is that the
driver does not need to apply full pressure for throttle, less
amount of force is enough to give full throttle.
The Braking system of the Formula Student Cars should be
very accurate that is the reason disc brakes are used for all
the four wheels. The Braking system was designed initially
and separately. The required sizes of calipers, discs and
master cylinders as per the required braking force and
inertia were calculated. Two master cylinders are used
which are tandem master cylinders taken from Maruti 800
Car and the calipers and discs areselected from KTM390RC.
Every car is necessarily equipped with a system to convert a
small form of energy exerted by the driver into braking and
accelerating the motor vehicle at high speeds. In the case of
the formula student car, it was required to construct such a
system, similar to the case of most vehicles, in which the
mechanical force from the driver’s foot on a lever causedthe
car to accelerate or decelerate. The levers and the housing
construct a pedal box the levers are the main parts of apedal
box, which is the focus of this project. The purpose of the
individual project was to research and design the working
mechanics of the pedalbox that was a reliable, safe, and cost
effective system for the Formula Student.
In preparation to design the pedal box, it was essential to
review the necessary requirements to construct, as well as
performing a literature review on past similar projects for a
basis. Once the research was completed, initial design ideas
were experimented until the final design was chosen for the
pedal box based on the requirements.
More dynamic,improved throttleresponse, adjustable: Pedal
Box has 3 different modes, “SPORT”, “SPORT Plus” and
“CITY”. Each program allows the driver to match the
response of the throttle to own needs and to the prevailing
traffic situation. Each program can be fine-tuned using the
plus and minus buttons, by which custom settings are
possible!
Today, most vehicles are “Drive-by-Wire” (called ECT or
ECM), and not cable sent as it used to be (Bowden cable).
Modern systems typically suffer excessive signaldelay. That
is the point where the Pedal box offers itself as a solution
and is able to unleash the full potential of the vehicle.
The curve indicates the speed with which an engine reacts to
the pressing of the pedal by the driver. It’s not about the
power that the car develops, but how long it takes to unleash
this power. A poor response and difficult acceleration is
clearly visible.
IJTSRD23413

International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470
The above figure shows the chassis of a formula student
vehicle. Where the pedal box is placed and the master
cylinder is also placed.
2. Literature Review
In this study, a study of conceptual design for the polymeric-
based composite automotive pedal box system is presented.
This study describes the importance of the concurrent
engineering technique in the totaldesign activity. Sevenidea
generation methods like the extension of the search space,
the morphological chart, the exploitation of the
morphological charts enabled designers to identify the sub
solutions to each sub-functions of the pedalbox system. The
evaluation matrix method was used to decide on the final
concept for the mounting bracket arrangement. The final
solution for the polymeric- based composite pedal box
system was three pedal mounted onto a common mounting
bracket. The clutch and the brake pedals were finally
compared and evaluated [1].
The modern automotive industries are replacing acceletor
and clutch pedal by lightweight materials such as polymer
composites, plastic, aluminium and its alloys, etc. The
purpose of replacement is reduction weight, cost, and
improvement in corrosion resistance. In aviation; the steel
material is replaced by light materials. In this study various
lightweight materials are compared with conventional steel
for brake pedal. These materials are analysed for different
sections for different loading and boundary conditions. The
aim of this study is to design and analyse the brake pedal
using CATIA and ANSYS software [2].
Nowadays, automotive industry is continuing to strive for
light weight vehicle in improving fuel efficiency and
emissions reduction. To produce a better performance car it
is important to design vehicles with optimum weight. In
order to reduce the weight of vehicle without sacrificing its
integrity, this project aims to employ topology optimization
technique to propose an optimal design of an automotive
component in early phase of product development. In this
project the material used for an existing brake pedal is
unchanged as this study focuses on reducing weight of
existing brake pedal without material substitution. The
digital model of an existing brake pedal was generated using
CATIA V5 solid modelling software. Topology optimization
was performed by using Altair Optistruct software under
linear static stress analysis.Finally,anewlightweightdesign
brake pedal is proposed. The result of the study shows that
the weight of a new designed brake pedal was 22% less as
compared to an existing brake pedal without sacrificing its
performance requirement [3].
In recent years, the conventional brake, accelerator and
clutch pedals of automotive vehicles are replaced by
polymeric-based composite pedals. The purpose of
replacement from metallic pedal to polymeric-based
composite material is to reducetheweight,cost andimprove
material degradation by corrosion. In this paper four
different sections of polymeric based brake pedals are
analysed as per the design parameters received from
General motors. The sections are analysed and arrived at a
winning concept based on stiffness comparison. A full scale
model is developed from the winning concept, while
developing full scale model an ergonomic study has been
made on few hatch back and SUVs car’s to improve the
driver’s comfort and reduce fatigue due to breaking
operation. The pedal is modelled using CATIA software and
analysis is carried out in ANSYS software. The results have
shown polymeric-based composite material meets the
requirements of manufacturer’s specification and can be
replaced with present metallic pedal. Weight reduction of
66.7% is achieved by using composite material [4].
3. Design Criteria
The constraints of the pedal box design are as follows:
 The pedal box needed to be designed around the
geometry constraints set in the results from the braking
system calculations. That is the master cylinder mount
height and the distance between the master cylinder
pivot and the brake pedal are fixed.
 The team’s frame engineer insisted that the total width
be no more than 10inches.
 The length of both the gas and the brake pedal need to
be approximately the length of a human foot (~
8.5inches).
 The SAE rules designate that the brake pedal must be
able to withstand a force of minimum 2000N.
Due to this constraint the material selection of the brake
pedal and the overall pedal box must be strong, stiff and
have high toughness.
The objective of the pedal box design was to satisfy allof the
constraints mentioned above and optimize for a minimal
weight.
4. Final Design
To design a brake system comprising of an adjustable pedal
box which should be able to lock all four wheels at the same
time. The Acceleration and Clutch pedals are also designed
using the required pedal ratios with respect to the
ergonomics of the driver.
The brake pedal is connected to a balancing rod which is
divided to both the master cylinders to generate the
required braking force. The front braking force should be
higher than that of the rear braking force hence the balance
was made not as equal amount but as for rear 45% and for
front is 55%. The considered applying force by the driver is
300N – 500N. The total braking force required and thepedal
ratio considerations are explained in the below formulae.
For Front:
B.F = pM.C*Ab.c.p
B. F = 2491.27 N
T b. f = B.F*N*μ*n
T b. f =24912.76 N
For Rear:
T b. f=b. f*µ*N*n
T b. f=11958.23 N
Total Braking Force Required = Rear Braking Force +Front
Braking Force.
Total Braking Force = 36870.913 N.
Only the master cylindersused cannot generatethis much an
amount of calliper force from that applied 300 – 500Nhence
we had to use a pedal ratio of 6:1 which increases the
applied load by 6 times and sends it to the master cylinder.
The retraction of the clutch pedal and acceleratorpedalafter
the load is removed was designed using torsion springmade
of stainless steel. Pedal angle is adjustable with respect to
the driver ergonomics. The pedal travel is taken as
20degrees and the spring design was checked for safe limits
for that travel.

5. Analysis
Fig.1. Analysis Procedure and Steps
The 3D Model Part designed using Solid Works is imported
into Ansys and we had to do FEA on the body applying load
on the face.
Fig. 2: Pedal is imported into the software.
We used fine mesh with tetra and adaptive element size
function as the option for meshing. The total number of
elements generated are 648011 and number of nodes are
988711.
Fig.3. Cylindrical Support and Load Application
Degree of freedom is 1 for the object that is Z direction only.
Then a load of 300N is applied on the front face of the pedal.
Material and other properties are entered andthen solvedto
obtain the results.
Fig.4. Equivalent Stress
Fig.5. Total Deformation Obtained.
6. Result
A safe, reliable and efficiently working pedal box with a
single brake providing both rear and front brakes as per the
requirement is designed.The design is also flexible and
adjustable with respect to the driver ergonomics. A driver
can apply a pedal force of 30kg to achieve maximum
potential of the system, which is much lesser than the
average panic braking force. This pedal box has been used in
the recent manufactured formula student car and the
performance of the pedal box was a charm. There is a great
potential to optimize, this safety limit which can be done by
removing material from low stressed region by further
decreasing the weight without effecting its structural
behavior.

Fig.6. Complete Pedal Box Assembly using Solid Works
7. References
[1] A Conceptual Design of the Concurrent Engineering
Design System for polymeric – Based Composite
Automotive Pedals” by the author S. M. Sapunan.
[2] Conceptual Design andAnalysisofBrakePedalProfile”,
by the authors K.K.Dhande, N.I.Jamadar,
SandeepGhatge
[3] Topology Optimization in Automotive Brake Pedal
Redesign”, by the authors Mohd Nizam Sudin,
Musthafah Mohd Tahir, Faiz Redza Ramli, Shamsul
Anuar Shamsuddin.
[4] Design and Analysis of Composite Brake Pedal: An
Ergonomic Approach” by the authors K KDhande, N I
Jamadar, Sandeep Ghatge.

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