GB1249745A - Power steering apparatus - Google Patents
Power steering apparatusInfo
- Publication number
- GB1249745A GB1249745A GB45821/69A GB4582169A GB1249745A GB 1249745 A GB1249745 A GB 1249745A GB 45821/69 A GB45821/69 A GB 45821/69A GB 4582169 A GB4582169 A GB 4582169A GB 1249745 A GB1249745 A GB 1249745A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- valve
- flap
- pistons
- conduits
- 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
Links
- 239000012530 fluid Substances 0.000 abstract 5
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
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
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
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
1,249,745. Vehicle power steering. TOYODA KOKI K.K., [trading as TOYODA MACHINE WORKS Ltd.]. 17 Sept., 1969 [17 Sept., 1968], No. 45821/69. Heading B7H. Power steering apparatus includes two steering shafts 22, 38 (Figs. 1 and 4), connected by a resilient member such as a double torsion-bar 40, a flap-valve mechanism 33, 34 actuable in response to relative rotation between the shafts, an hydraulic motor 16 (Fig. 3) operable by the flap-valve mechanism to boost manual steering, pistons 42, 43 serving to damp vibrations of the flap-valve mechanism, and a surge pressure absorbing device for absorbing surge pressure in the apparatus. Steering shaft 22, which is coupled to shaft 38 via a coupling 30, is connected to a main valve member 29 in which are provided valve chambers 35, 36, each of which houses a respective flap-valve 33, 34. Flap-valve 33 comprises valve seats (33a) (Fig. 5, not shown) normally spaced from the openings of distribution ports (35a, 35b) which connect chamber 35 to annular grooves 31, 32 of valve member 29 via conduits (49, 50). Similarly, flap-valve 34 comprises valve seats (34a) (Fig. 6, not shown), normally spaced from the openings of jet ports (36a, 36b) connecting annular grooves 31, 32 to chamber 36 via conduits (51, 52). The annular grooves 31, 32 are connected via conduits 59, 60, to respective chambers 15a, 15b of the hydraulic motor 16. In the absence of steering torque, fluid pumped into chamber 35 through port 25 enters distribution ports (35a, 35b) of chamber 35 and hence is supplied to grooves 31, 32 from which it passes to chambers 15a, 15b of the motor as well as to chamber 36 via jet ports (36a, 36b) and thence to reservoir via outlet 26. Turning of steering shaft 38 clockwise results in distribution ports (35b) in chamber 35 to be closed by the valve seats so that groove 32 receives no fluid. However, distribution ports (35a) are fully opened so that groove 21 receives fluid which then passes via conduits (52) to jet ports (36b) of chamber 36. These, however, have been closed by their associated valve seats. Hence, pressure build-up in groove 31 causes fluid to pass to chamber 15a of the motor which thereby assists rotation of the output shaft 12 of the apparatus. In the embodiment shown, spring-urged pistons 42, 43 receive fluid from grooves 31, 32 and press against the flap-valves to eliminate their vibration. Centrally-mounted pistons 44 are provided to absorb surge pressures in the hydraulic circuitry. In other embodiments, throttling orifices may be included in conduits 59, 60 in addition to pistons 44 (Fig. 9, not shown), pistons 44 may be replaced by spool valves and throttling orifices in the conduits 59, 60 (Figs. 10, 11, not shown), pistons 42, 43 may have direct connection with chamber 35 and an arrangement of spool valves and throttling orifices in conduits 59, 60 (Fig. 12, not shown), or a surge pressure absorbing piston (80) (Fig. 13, not shown), may be provided externally of the main valve housing.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP43067056A JPS4819972B1 (en) | 1968-09-17 | 1968-09-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1249745A true GB1249745A (en) | 1971-10-13 |
Family
ID=13333783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB45821/69A Expired GB1249745A (en) | 1968-09-17 | 1969-09-17 | Power steering apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US3657967A (en) |
JP (1) | JPS4819972B1 (en) |
FR (1) | FR2018256A1 (en) |
GB (1) | GB1249745A (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3927604A (en) * | 1971-06-24 | 1975-12-23 | Zahnradfabrik Friedrichshafen | Power steering system with reaction force limiting means |
DE2222332A1 (en) * | 1972-05-06 | 1973-11-22 | Zahnradfabrik Friedrichshafen | AUXILIARY DEVICE FOR STORAGE OPERATION |
US3991656A (en) * | 1974-06-06 | 1976-11-16 | Toyoda Koki Kabushiki Kaisha | Servo valve device in power steering apparatus |
JPS51141132A (en) * | 1975-05-30 | 1976-12-04 | Toyoda Mach Works Ltd | Servo-valve device for power steering gear |
JPS58614Y2 (en) * | 1977-09-06 | 1983-01-07 | 豊田工機株式会社 | Power steering device |
US4339986A (en) * | 1980-04-17 | 1982-07-20 | Trw Inc. | Power steering apparatus |
JPS5852843U (en) * | 1981-09-26 | 1983-04-09 | ミツミ電機株式会社 | slide lever switch |
JPS5879831U (en) * | 1981-11-20 | 1983-05-30 | ミツミ電機株式会社 | Daytent changeover type slide switch |
US4627331A (en) * | 1985-05-31 | 1986-12-09 | Flo-Tork, Inc. | Rotary actuator having cast piston and arcuate rack bearing |
JP2565393B2 (en) * | 1989-02-10 | 1996-12-18 | 三菱自動車工業株式会社 | Steering gear ratio variable device |
US5103715A (en) * | 1989-03-17 | 1992-04-14 | Techco Corporation | Power steering system |
WO2015149207A1 (en) * | 2014-03-31 | 2015-10-08 | 深圳市智行单轴双轮驱动技术有限公司 | Shock absorption mechanism of steering motor |
CN106233588B (en) * | 2014-03-31 | 2019-02-01 | 深圳市智行单轴双轮驱动技术有限公司 | A kind of steering motor |
US11591005B2 (en) | 2018-01-08 | 2023-02-28 | Volvo Construction Equipment Ab | Tunable dynamic absorber for attenuating vibration |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2141703A (en) * | 1937-11-04 | 1938-12-27 | Stanolind Oil & Gas Co | Hydraulic-pneumatic pumping system |
US2684692A (en) * | 1950-08-17 | 1954-07-27 | Chrysler Corp | Noise eliminator for fluid systems |
US3408900A (en) * | 1965-09-02 | 1968-11-05 | Toyoda Machine Works Ltd | Servo valve device in power steering gear of automobile |
-
1968
- 1968-09-17 JP JP43067056A patent/JPS4819972B1/ja active Pending
-
1969
- 1969-09-16 US US858380A patent/US3657967A/en not_active Expired - Lifetime
- 1969-09-17 GB GB45821/69A patent/GB1249745A/en not_active Expired
- 1969-09-17 FR FR6931543A patent/FR2018256A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
JPS4819972B1 (en) | 1973-06-18 |
DE1946685A1 (en) | 1970-04-09 |
FR2018256A1 (en) | 1970-05-29 |
US3657967A (en) | 1972-04-25 |
DE1946685B2 (en) | 1976-11-18 |
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