WO2014178084A2 - Système de direction assistée électrique pour tracteurs agricoles et utilitaires - Google Patents

Système de direction assistée électrique pour tracteurs agricoles et utilitaires Download PDF

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Publication number
WO2014178084A2
WO2014178084A2 PCT/IN2014/000295 IN2014000295W WO2014178084A2 WO 2014178084 A2 WO2014178084 A2 WO 2014178084A2 IN 2014000295 W IN2014000295 W IN 2014000295W WO 2014178084 A2 WO2014178084 A2 WO 2014178084A2
Authority
WO
WIPO (PCT)
Prior art keywords
electric power
power steering
steering
shaft
steering system
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IN2014/000295
Other languages
English (en)
Other versions
WO2014178084A4 (fr
WO2014178084A3 (fr
Inventor
Kiran Manohar Deshmukh
Ravindra Nath Sharma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sona Koyo Steering Systems Ltd
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/fr
Publication of WO2014178084A3 publication Critical patent/WO2014178084A3/fr
Publication of WO2014178084A4 publication Critical patent/WO2014178084A4/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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

Definitions

  • the subject matter of the present in ention relates to an electric power steering system for farm and utility tractors having an integrated steering electronic control unit (EC3 ⁇ 4 j j and torque sensor.
  • EC3 ⁇ 4 j j integrated steering electronic control unit
  • the manual steering system comprises steering wheel (1) which is mounted on a steering shaft (2) passing through a steering jacket (3);
  • the steering shaft (2) is iirther connected to a steering gear box (4) having a sector shaft (5) and a drop arm (6).
  • FIG.2 An internal schematic of the steering gear box (4) used in manual steering systems for utility tractors is illustrated in Fig.2.
  • a worm shaft (4a) is mounte in the gear box housing (4c) with the support of a lower spherical rollei ball bearing (4d) and an upper spherical roller ball 1 ⁇ 4aring 4ig .
  • a ball nut assembly (4b) is mouterrorism on the w ⁇ rrh shaft (4a).
  • the worm shaft (4a) and ball nut assembly (4b) are perpendicular to each other.
  • the sector shaft (5) is attached to the 3 ⁇ 4all nut assembly (4b) by a dovetail guide (4c). As shown in Fig., 2 3 ⁇ 4 the drop arm (6) is mounted on the sector shaft (5).
  • the drop arm (6) is connected to a steering knuckle arm (8) through a tic rod (7).
  • the steering knuckle arm (8) is further connected by drag link (9).
  • the steering system operates to steer the tires 1 mounted on the front axle bea (10) in the driver intended direction.
  • the torque required to c steej a : tg eti r depends on various parameters such as "road conditions, weight of the tractor, speed of the tractor and loading condition of the tractor, etc.” and is usually as high as about 90 Nm.
  • the complex structure of the manual steering system makes it very difficult and painful toi use and causes r gue to the driver in long run. Further ⁇ because of very high sferirig torque requirements, it becomes very difficult for old aged and female drivers to drive the tractor.
  • the steering wheel (V) mounted on the steering shaft (2) and passing through the ⁇ 3 ⁇ 4lunm jacket (3) is connected to a ⁇ _ra jfe motor direetioti control valve (M% A h ⁇ f ulie steering pump (h3) is connected to the tractor engine via a belt and pulley afr3 ⁇ 4hgemeni
  • the hydraulic steering pump (h3) is also connected to an oil reservoir (h2).
  • the hydraulic motor/direction control valve (hi) is further connected to a hydraulic steering cylinder (h6) via hose pipes (h4).
  • the hydraulic steering cylinder (h6) is connected to
  • the hydraulic motor/direction control valve (hi) rotates and opens a passage for hydraulic oil to move towards the hydraulic steering cylinder (h6) to turn the tire (1 1).
  • the hydraulic motor/direction control valve (hi) is ;£fO3 ⁇ 4id with pressurized oil coming from the oil reservoir (h2) through the hydraulic steering pump (h3).
  • hydrostatic steering system makes steering off the vehicle eas for the driver but is not safe in case of situation when oil comes out from the hydraulic steering cylinder or hose pipes due to many reasons including damage. If oil seal is leaked or hose pipes are damaged ⁇ the tractor is unable to be steere which indicates a big concern for the safety of the users.
  • the tractor with manual steering can be towed without any problem in case tractor engine is not working due t non-availability of steering capability because* of the presence of mechanical linkages between various components, whereas, it requires special vehicle to tow the tractor in hydrostatic steering systejn whenever there is oil leakage from the hydraulic steering cylinder or hose ⁇ pipes bec ⁇ se of the absence of m naltic l Iinfeges ⁇ ⁇
  • the present invention proposes an easy, less complex and safe steering system t be used by farm and utility tractors without loss of mechanical linkages and using state of the art EPS technology specially developed for tractors.
  • EPS electric power steering
  • Fig. 1 is aselkmatie ili ⁇
  • Fig. 2 is an isolat d* internal schematic view of the steerin gear box of the manual steering system of fig,. 1.
  • Fig. 3 is a schematic illustration of the hydrostatic power steering used in tractors rating above SO hOTse power.
  • FIG. 4 igi .il ⁇ schematic illustration of an EPS system having mechanical linkages ⁇ in accordance with an aspect of the present invention.
  • Fig ⁇ S is an isolated ⁇ partially schematic, cross-sectional view of the EPS od ⁇ tmit of EPS system of fig. 4.
  • Fig is an exploded view of the EPS module/uriit oflPS systern of fig s
  • Fig. 7 shows schematic of position of sensor chips on integrated electronic control board and roagtietf for torque sensing, in ac ⁇ rdance with an aspect of the presetit invention.
  • EPS Electric Power Steering
  • Fig. 4 shows an EPS system for farm tractors ih accordance with one embodiment of the present invention.
  • an EPS module (13) is pla3 ⁇ 4di i between steering gear box (4A) and steering shaft (2) of the The EPS module (13) provides steering assist to the driver and the EP i module ( ⁇ 3) in.
  • ⁇ he ⁇ present invention is connected to steering shaft (2) via coupler inside upper bracket (12) and to steering
  • FIGs. 5 & 6 the schematic and exploded views of proposed 3 ⁇ 4PS module (13) are shown respectively in accordance with an aspect of the present invention.
  • force is appHed at the steering wheel (I) (shown in Fig. 4) which is mounted on a steering shaft; 23 ⁇ 4 it causes the input shaft (13a) which is connected to steerin shaft (2) via coupler inside upper bracket to rotate and creates twist in the torsion bar (13d) (i.e., it experiences torsion) which further, causes rotation of the output shaft (13f).
  • the input shaft (13a) and output shaft (13f) are connected by way of a torsion bar (13d) such that one end of a torsion bar (13d) rotates with the input shaft (13a) and the other end rotates with the output shaft (13f)-
  • an EPS module ( 3) in the present invention incorporates an input gear female stopper (13bl) and output gear male stopper (13c 1).
  • the rotation or rotational Motion of the input shaft (13a) and output shaft (I3f) is transmitted to input sensor pinion (13n) and output sensor cum intermediate pinion (131) through input gear (i b and output; gear (13c) respectively.
  • the rotat » ⁇ 3 ⁇ 4 oftrte injpt sensor pinion (13n) and output sensor cum intermediate pinion (131) further causes rotation of the magnets (13jl 8c 13j2) mounted on input sensor pinion (1 n) a output sensor cum intemediate pim 7.
  • 3j3 ⁇ 4 are sappojfed by magnel holders (13k I & 13k2) r ⁇ etfvel .
  • the rotation angle of magnets (13jl & 13j2) are sensed by sensor chips (1311 & 13i2) placid on an integrated electronic control unit assenibl (13s) as shown in Fig. 7. ⁇
  • the rotation angle inibnttauore sens ⁇ 1312) is converted into torque f r atign that detects the torque or force applied at the input shaft connected to steering wheel (1) (show in Fig. 4) and this torque information 1 ⁇ 2 sent to the microprocessor of an integrated electronic control unit assembly (13s) which further supplies electrical current to the motor (13r) based on the signals or torque iirtfbTfmation received from the torque sensor in-built in an electronic control unit through supply connector (13t).
  • the motor After receiving inrorm ori in the form of electrical current, the motor applies assisting torque to the output shaft (13f) that helps rotate the output shaft (131) through motor pinion (13o), inteonediate gear (13m), i-uerme iate pinion (131) and output gear (13c).
  • the output s aft; (131) of EPS module (13) is connected to steering gear box (4A) via coupler inside lower bracket (14) having a sector shaft (5) and drop arm (6).
  • the drop arm (6) is connected to tie rod 7) and tie rod (7) is connected to steering knuckle arm (8) which is further connected by drag link (9).
  • the torque at the: output shaft (sum of torque applied at the steering wheel (1) and the assist torque provided by motor (13r)) helps turn the tires 11 ®un (10).
  • an EPS module (13) has an integr ⁇ tfed housing (13g), an upper cover (13p) and a lower cover 3 ⁇ 4 ,
  • the upper cover fl3p) and the lower cover 13h) are fastened ith tte integrated housing (13g) by means of fasteners (13q) such as boltey nuts, rivets etc.

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

L'invention porte sur un système de direction assistée électrique, pour un segment de tracteurs agricoles et utilitaires, qui comporte un module de direction assistée électrique unique et innovant (13) entre le boîtier de direction (4A) et l'arbre de direction (2) du système de direction manuelle, ce qui rend le système de direction assistée pour tracteurs plus sûr et beaucoup plus fiable puisqu'il présente aussi des couplages mécaniques entre divers composants. Le module de direction assistée électrique (13), qui assure au conducteur une assistance de direction, est relié à l'arbre de direction (2), par l'intermédiaire d'un coupleur dans un support supérieur (12), et au boîtier de direction (4A) par l'intermédiaire d'un coupleur dans un support inférieur (14). Le module de direction assistée électrique (13) comprend une barre de torsion (13d), un ensemble capteur de couple et une unité de commande électronique intégrés (13s) sur une carte de circuit imprimé afin d'obtenir une conception économique, un moteur (13r) et un train d'engrenages réducteur robuste comportant un pignon moteur (13o), un engrenage intermédiaire (13m), un pignon intermédiaire (131) et un mécanisme d'engrenage de sortie (13c).
PCT/IN2014/000295 2013-05-03 2014-05-02 Système de direction assistée électrique pour tracteurs agricoles et utilitaires Ceased WO2014178084A2 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2014/000295 Ceased WO2014178084A2 (fr) 2013-05-03 2014-05-02 Système de direction assistée électrique pour tracteurs agricoles et utilitaires

Country Status (1)

Country Link
WO (1) WO2014178084A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107416017A (zh) * 2017-08-08 2017-12-01 豫北转向系统股份有限公司 一种轻型卡车用电子控制液压转向系统
CN110667699A (zh) * 2019-09-04 2020-01-10 东风商用车有限公司 一种转向机布置系统
JP2020182401A (ja) * 2019-05-07 2020-11-12 株式会社クボタ 作業車
US11548547B2 (en) * 2019-05-16 2023-01-10 Steering Solutions Ip Holding Corporation Highly integrated EPS system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61275057A (ja) * 1985-05-27 1986-12-05 Honda Motor Co Ltd 電動式パワ−ステアリング装置
JP4414424B2 (ja) * 2006-12-01 2010-02-10 本田技研工業株式会社 電動パワーステアリング装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107416017A (zh) * 2017-08-08 2017-12-01 豫北转向系统股份有限公司 一种轻型卡车用电子控制液压转向系统
JP2020182401A (ja) * 2019-05-07 2020-11-12 株式会社クボタ 作業車
WO2020225955A1 (fr) * 2019-05-07 2020-11-12 株式会社クボタ Véhicule de travail
CN113710083A (zh) * 2019-05-07 2021-11-26 株式会社久保田 作业车
JP7169938B2 (ja) 2019-05-07 2022-11-11 株式会社クボタ 作業車
US11548547B2 (en) * 2019-05-16 2023-01-10 Steering Solutions Ip Holding Corporation Highly integrated EPS system
CN110667699A (zh) * 2019-09-04 2020-01-10 东风商用车有限公司 一种转向机布置系统
CN110667699B (zh) * 2019-09-04 2022-06-10 东风商用车有限公司 一种转向机布置系统

Also Published As

Publication number Publication date
WO2014178084A4 (fr) 2015-02-19
WO2014178084A3 (fr) 2014-12-24

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