GB1097948A - A steering system for endless track vehicles - Google Patents

A steering system for endless track vehicles

Info

Publication number
GB1097948A
GB1097948A GB978465A GB978465A GB1097948A GB 1097948 A GB1097948 A GB 1097948A GB 978465 A GB978465 A GB 978465A GB 978465 A GB978465 A GB 978465A GB 1097948 A GB1097948 A GB 1097948A
Authority
GB
United Kingdom
Prior art keywords
brake
pressure
clutch
valve
spring
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.)
Expired
Application number
GB978465A
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.)
Saab Bofors AB
Original Assignee
Bofors AB
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 Bofors AB filed Critical Bofors AB
Publication of GB1097948A publication Critical patent/GB1097948A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
    • B62D11/02—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides
    • B62D11/06—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source
    • B62D11/10—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears
    • B62D11/14—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source
    • B62D11/18—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using gearings with differential power outputs on opposite sides, e.g. twin-differential or epicyclic gears differential power outputs being effected by additional power supply to one side, e.g. power originating from secondary power source the additional power supply being supplied hydraulically
    • B62D11/183—Control systems therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
    • B62D11/02—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides
    • B62D11/06—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source
    • B62D11/08—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using brakes or clutches as main steering-effecting means

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)

Abstract

1,097,948. Steering endless track vehicles. BOFORS A.B. March 8, 1965 [March 6, 19641, No. 9784/65. Heading B7H. A steering system for an endless track vehicle comprises for each track a normally engaged clutch 15 (15<SP>1</SP>) between a gearbox and a track driving wheel 14 (14<SP>1</SP>), an hydraulic servo 22 (22<SP>1</SP>) for disengaging the clutch, a brake 28 (28<SP>1</SP>) engageable with a clutch output member 16 (16<SP>1</SP>), an hydraulic servo 32 (32<SP>1</SP>) for controlling the brake comprising a differential piston (34), (Fig. 4, not shown), normally biased to maintain the brake inoperative, a fluid pressure control valve 52 with a fluid pressure inlet 50 and an outlet 55 (55<SP>1</SP>) to the clutch and brake servos and valve actuating means 98, (98<SP>1</SP>) movable manually in sequence from an inoperative position to a first position in which the control valve outlet pressure is sufficient for disengagement of the clutch and to a second position in which the outlet pressure overcomes the piston bias and causes the brake to be applied. The control valve 52 comprises two valve spools 59, 59<SP>1</SP>, operable by respective right hand and left hand track levers 98, 98<SP>1</SP>, and a cut-off valve 90, operable by both levers. The valve spool 59 is acted upon by the opposing forces of a spring 78 and of the hydraulic fluid in a chamber 74, which is at the pressure in the outlet line 55, and maintains an output pressure determined by the compression of the spring 78. On movement of the lever 98 from the neutral position shown into the first operative position, when a spring loaded sleeve 85 just touches a spring retainer 79, the cut-off valve 90 closes the passage between the fluid inlet 50 and a passage 67 leading through a line 58 to a reservoir 44 and the valve spool 59 is pushed to the left by the spring 78 to supply fluid to the servos 22 and 32 at a pressure sufficient to release the clutch but insufficient to move the differential piston (34). On further movement of the lever 98 the spring 78 is further compressed increasing the pressure in the line 55 sufficiently to operate the differential piston and to apply the brake 28. Movement of both levers 98 and 98<SP>1</SP> together declutches and then brakes both tracks.
GB978465A 1964-03-06 1965-03-08 A steering system for endless track vehicles Expired GB1097948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE282064 1964-03-06

Publications (1)

Publication Number Publication Date
GB1097948A true GB1097948A (en) 1968-01-03

Family

ID=20260778

Family Applications (1)

Application Number Title Priority Date Filing Date
GB978465A Expired GB1097948A (en) 1964-03-06 1965-03-08 A steering system for endless track vehicles

Country Status (7)

Country Link
AT (1) AT250183B (en)
BE (1) BE660604A (en)
CH (1) CH435998A (en)
DK (2) DK112838B (en)
FR (1) FR1430491A (en)
GB (1) GB1097948A (en)
NL (1) NL6502813A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572483A (en) * 1969-03-24 1971-03-30 Benoit Giguere Steering clutch and brake for double-tracked vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146102A (en) * 1977-07-18 1979-03-27 Caterpillar Tractor Co. Pressure modulating control valve for steering systems or the like
FR2473976B1 (en) * 1980-01-21 1987-09-18 Bourgue Sarl M A DIRECTIONAL DEVICE FOR SMALL SELF-PROPELLED MACHINE, PARTICULARLY FOR AGRICULTURAL USE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572483A (en) * 1969-03-24 1971-03-30 Benoit Giguere Steering clutch and brake for double-tracked vehicle

Also Published As

Publication number Publication date
DK112838A (en)
FR1430491A (en) 1966-03-04
AT250183B (en) 1966-10-25
NL6502813A (en) 1965-09-07
DK112838B (en) 1969-01-20
BE660604A (en) 1965-07-01
CH435998A (en) 1967-05-15

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