WO2014178084A4 - Electric power steering system for farm and utility tractors - Google Patents

Electric power steering system for farm and utility tractors Download PDF

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Publication number
WO2014178084A4
WO2014178084A4 PCT/IN2014/000295 IN2014000295W WO2014178084A4 WO 2014178084 A4 WO2014178084 A4 WO 2014178084A4 IN 2014000295 W IN2014000295 W IN 2014000295W WO 2014178084 A4 WO2014178084 A4 WO 2014178084A4
Authority
WO
WIPO (PCT)
Prior art keywords
electric power
steering
power steering
steering system
control unit
Prior art date
Application number
PCT/IN2014/000295
Other languages
French (fr)
Other versions
WO2014178084A3 (en
WO2014178084A2 (en
Inventor
Kiran Manohar Deshmukh
Ravindra Nath Sharma
Original Assignee
Sona Koyo Steering Systems Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sona Koyo Steering Systems Ltd. filed Critical Sona Koyo Steering Systems Ltd.
Publication of WO2014178084A2 publication Critical patent/WO2014178084A2/en
Publication of WO2014178084A3 publication Critical patent/WO2014178084A3/en
Publication of WO2014178084A4 publication Critical patent/WO2014178084A4/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
    • B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0409—Electric motor acting on the steering column
    • B62D5/0412—Electric motor acting on the steering column the axes of motor and steering column being parallel

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

An electric power steering system for farm and utility tractors segment incorporates a unique and innovative electric power steering module (13) between steering gear box (4A) and steering shaft (2) of the manual steering system, thus, making it a safe and much more reliable power steering system for tractors since it also has mechanical linkages present between various components. The electric power steering module (13) provides steering assist to the driver and is connected to steering shaft (2) via coupler inside upper bracket (12) and to steering gear box (4A) via coupler inside lower bracket (14). The electric power steering module (13) has a torsion bar (13d), an integrated torque sensor and integrated electronic control unit assembly (13s) on a printed circuit board for cost effective design, a motor (13r) and a robust reduction gear train comprising motor pinion (13o), intermediate gear (13m), intermediate pinion (131), and output Gear (13c) mechanism.

Claims

AMENDED CLAIMS received by the International Bureau on 09 December 2014 (09.12.2014)
1. An electric power steering system for farm and utility tractors comprising an electric power steering module (13) placed between a steering gear box (4A) and a steering shaft (2), the electric power steering module (13) comprising
an input shaft (13a);
an output shaft (13f);
a torsion bar (13d) connecting the input shaft (13a) and the output shaft (131) such that one end of the torsion bar (13d) rotates with the input shaft (13a) and the other end rotates with the output shaft (13f);y
an integrated torque sensor and steering electronic control unit assembly (13s) on a printed circuit board, wherein said torque sensor is in-built in said electronic control unit (13s);
a driving means for rotating the output shaft (13f) on receiving electrical current from said steering electronic control unit (13s); and
a gear transmission for transferring motion from the driving means to the output shaft (13f).
2. The electric power steering system as claimed in claim 1, wherein the input shaft (13a) is connected to the steering shaft (2) such that the input shaft (13a) starts rotating on applying force on a steering wheel (1) mounted on the steering shaft (2).
3. The electric power steering system as claimed in claim 1 or 2, wherein there is rotation of the output shaft (13f) with rotation in the input shaft (13a).
4. The electric power steering system as claimed in any of the preceding claims, wherein rotational motion of the input shaft (13a) is transferred to an input sensor pinion (13n) through an input gear (13b).
5. The electric power steering system as claimed in any of the preceding claims, wherein rotational motion of the output shaft (13f) is transferred to an output sensor cum intermediate pinion (131) through an output gear (13c).
6. The electric power steering system as claimed in claim 4 or 5, wherein rotational motion of the input sensor pinion (13n) and output sensor cum intermediate pinion (131) is transferred to magnets (13jl, 13j2) mounted on the input sensor pinion (13n) and the output sensor cum intermediate pinion (131).
10
7. The electric power steering system as claimed in claim 6, wherein rotation angle of said magnets (13jl, 13j2) is sensed by sensor chips (13il, 13i2) placed on said integrated electronic control unit assembly (13s).
8. The electric power steering system as claimed in claim 7, wherein rotation angle information sensed by said sensor chips (13il, 13i2) is converted into torque information and sent to said steering electronic control unit (13s);
9. The electric power steering system as claimed in any of the preceding claims, wherein said steering electronic control unit (13s) sends electrical current proportional to the torque at the input shaft (13a) to the driving means and driving means is a motor (13r).
10. The electric power steering system as claimed in claim 1, wherein the gear transmission is in the form of a reduction gear train.
1 1. An electric power steering system, substantially as herein described with reference to, and as illustrated in, the accompanying drawings.
11

Statement under Article 19(1)

With regard to documents cited in the International Search Report and written opinion of the International Searching Authority, we submit the following clarificatory remarks in respect of the present invention:

The present invention relates to an electric power steering system for farm and utility tractors having an integrated steering electronic control unit (ECU) and torque sensor.

The subject matter of the present invention aims at providing a compact, less complex, safe and cost effective steering system to be used by farm and utility tractors without loss of mechanical linkages and using state of the art EPS technology specially developed for tractors. In doing so, the present invention addresses various problems associated with the manual and hydrostatic steering systems as used in state-of-the art. The present invention is specially designed for OFF road vehicles integrated with recirculating ball type steering gear box.

US 4657103 (Dl) serves an objective that is altogether different in scope and nature from the present invention i.e., "controlling the steering operation of the vehicle with respect to the rapid changes taking place in the steering speed of a steering wheel, or aligning the operation of the electric motor to be in line with the steering operation (subjected to sudden and random changes)", as is apparent from the description of the patent.

Therefore, Dl cannot be considered to be relevant for the purpose intended to be served by the present invention as it does not address the problems stated in the background of the present invention and thus, goes ahead by serving a different purpose.

In addition to above, Dl fails to disclose a feature "an integrated torque sensor and steering electronic control unit assembly on a printed circuit board, wherein said

12 torque sensor is in-built in said electronic control unit", as is claimed in claim 1 of the present patent application and sufficiently supported by the complete specification.

US 7992672 (D2) also fails to address the problems associated with the prior arts as described in the background section of the present patent application and hence, serves a different objective.

D2 relates to an electric power steering system that aims to prevent overloading of a steering gearing box or a steering actuator of the electric power steering system. The said objective is achieved by preventing the assist current from excessively increasing and thus, detrimentally affecting the durability of a steering gear box and/or the motor of a steering actuator.

Moreover, D2 also fails to disclose the feature "an integrated torque sensor and steering electronic control unit assembly on a printed circuit board, wherein said torque sensor is in-built in said electronic control unit", as is claimed in claim 1 of the present patent application.

In addition to above comments, both the documents Dl & D2, unlike the present invention, relates to an automotive application of rack and pinion type.

13

PCT/IN2014/000295 2013-05-03 2014-05-02 Electric power steering system for farm and utility tractors WO2014178084A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1328DE2013 2013-05-03
IN1328/DEL/2013 2013-05-03

Publications (3)

Publication Number Publication Date
WO2014178084A2 WO2014178084A2 (en) 2014-11-06
WO2014178084A3 WO2014178084A3 (en) 2014-12-24
WO2014178084A4 true WO2014178084A4 (en) 2015-02-19

Family

ID=51844065

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2014/000295 WO2014178084A2 (en) 2013-05-03 2014-05-02 Electric power steering system for farm and utility tractors

Country Status (1)

Country Link
WO (1) WO2014178084A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107416017A (en) * 2017-08-08 2017-12-01 豫北转向***股份有限公司 A kind of light truck Electronic Control hydraulic steering system
JP7169938B2 (en) * 2019-05-07 2022-11-11 株式会社クボタ work vehicle
US11548547B2 (en) * 2019-05-16 2023-01-10 Steering Solutions Ip Holding Corporation Highly integrated EPS system
CN110667699B (en) * 2019-09-04 2022-06-10 东风商用车有限公司 Steering engine arrangement system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61275057A (en) * 1985-05-27 1986-12-05 Honda Motor Co Ltd Electric power steering device
JP4414424B2 (en) * 2006-12-01 2010-02-10 本田技研工業株式会社 Electric power steering device

Also Published As

Publication number Publication date
WO2014178084A3 (en) 2014-12-24
WO2014178084A2 (en) 2014-11-06

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