GB2086323A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Electrically Driven Oil Pressured Power Steering Apparatus
Assignee: Tokai TRW and Co Ltd
•
Filing: 1981-07-27
•
Granted: —
•
Expires: 2001-07-27
Abstract
Abstract An electrically driven oil pressured power steering apparatus comprises an oil pump 6 driven by an electric motor 20 for supplying a working oil to a power cylinder 1, a control valve 7 for controlling the supply of the working oil, and a sensing means 28 and an electronically operated on-off means 27 which, in common, control a power supply to the electric motor 20. In the apparatus, a state of power steering is shifted to a state of manual steering when the electric motor is de- energised by the electronically operated on-off means. The sensing means 28 comprises a vehicle speed sensor 25 and a drive sensor 29 receiving a signal from a steering wheel, accelerator, brake or clutch pedal. A valve 10 interconnects lines leading to power cylinder chambers 1a, 1b when the electric motor is de- energised. A pressure relief value, Figures 9 and 10, interconnects supply and return lines of pump 6 when the steering apparatus reaches its full lock position. Power-assistance to steering may be reduced or eliminated above a predetermined vehicle speed. <IMAGE>
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-23 12:45
CPC Classifications
B; B62; B62D; B62D6/00; B62D6/02; B62D5/00; B62D5/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
95 words
An electrically driven oil pressured power steering apparatus of an automobile comprising an oil pump which is driven by an electric motor and supplies a working oil to a power cylinder, a control valve which controls the supply of the working oil and a manipulating apparatus and an electronically operated on-off means which, in common, control a power supply to the electric motor, characterized in that a state of power steering is shifted to a state of manual steering in accordance with a stop of the electric motor effected by the electronically operated on-off means.
Claim 2
Dependent Claim
95 words
An electrically driven oil pressured power steering apparatus of an automobile comprising an oil pump which is driven by an electric motor and supplies a working oil to a power cylinder, a control valve which controls the supply of the working oil and a manipulating apparatus and an electronically operated on-off means which, in common, control a power supply to the electric motor, characterized in that a state of power steering is shifted to a state of manual steering in accordance with a stop of the electric motor effected by the electronically operated on-off means.
Claim 3
Dependent Claim
41 words
An electrically driven oil pressured power steering apparatus as recited in Claim 1, further comprising a bypass valve which is provided in the paths, through which the working oil is supplied to the power cylinder so as to communicate the paths.
Claim 4
Dependent Claim
48 words
An electrically driven oil pressured power steering apparatus as recited in Claim 2, further characterized in that the state of power steering is established at a time when the bypass valve closes and the state of manual steering is established at a time when the bypass valve opens.
Claim 5
Dependent Claim
38 words
An electrically driven oil pressured power steering apparatus as recited in Claim 2, further comprising a reducing relief valve which is connected between a supply port of the oil pump and a return port of the oil pump.
Claim 6
Dependent Claim
46 words
An electrically driven oil pressured power steering apparatus as recited in Claim 2, characterized in that the bypass valve is constructed so that the working oil supplying paths can be communicated in conjunction with the operations of the manipulating apparatus and the electronically operated on-off means.
Claim 7
Dependent Claim
55 words
An electrically driven oil pressured power steering apparatus as recited in Claim 5, further characterized in that the communication is meant by a closure of the bypass valve effected at a time when the oil pump is rotating and by an opening of the bypass valve effected at a time when the oil pump stops.
Claim 8
Dependent Claim
40 words
An electrically driven oil pressured power steering apparatus as recited in Claim 1 , further characterized in that the manipulating apparatus and the electronically operated on-off means operate the electric motor in accordance with the manipulation of a steering wheel.
Claim 9
Dependent Claim
62 words
An electrically driven oil pressured power steering apparatus as recited in Claim 1 , further characterized in that the manipulating apparatus
and the electronically operated on-off means operate the electric motor in accordance with a detection of forward moving of the automobile at
a low speed or of backward moving of the
automobile, by means of signals from transmission of the automobile.
Claim 10
Dependent Claim
39 words
An electrically driven oil pressured power steering apparatus as recited in Claim 1 ,further characterized in that the manipulating apparatus
and the electronically operated on-off means operate the electric motor in accordance with
manipulations of various kinds of pedals.
Claim 11
Dependent Claim
91 words
1 0. An electrically driven oil pressured power steering apparatus as recited in Claim 1 further characterized in that the manipulating apparatus and the electronically operated onoff means control to operate the electric motor under a condition that the speed of the automobile is in a range which does not exceed a previously determined speed and the manipulating apparatus and the electronically operated onoff means control not to operate the electric motor under a condition that the speed of the automobile reaches in a range which exceeds the previously determined speed.
Claim 12
Dependent Claim
42 words
An electrically driven oil pressured power
steering apparatus as recited in Claim 1 ,further characterized in that the electric motor is
controlled by the manipulating apparatus and the
electronically operated on-off means in
conjunction with starting of the engine of the
automobile.
Claim 13
Dependent Claim
28 words
An electrically driven oil pressured power
steering apparatus as recited in Claim 11 , further characterized in that "in conjunction with
starting" means that the starting is completed.
Claim 14
Dependent Claim
30 words
An electrically driven oil pressured power
steering apparatus as recited in Claim 11 , further
characterized in that "in conjunction with starting" means "after a certain time from the start".
Claim 15
Dependent Claim
25 words
An electrically driven oil pressured power steering apparatus as recited in Claim 1 , further characterized in that the electronically operated on-off means comprises relays.
Claim 16
Dependent Claim
28 words
1 5. An electrically driven oil pressured power steering apparatus as recited in Claim 14, further characterized in that the electronically operated on-off means further comprises semiconductor elements.
Claim 17
Dependent Claim
45 words
1 6. An electrically driven oil pressured power steering apparatus as recited in Claim 4, further characterized in that a pilot pressure applied to the spool of the bypass valve is additionally applied to the line pressure port to thereby apply an over pressure condition.
Claim 18
Dependent Claim
49 words
1 7. An electrically driven oil pressured power steering apparatus as recited in Claim 16, characterized in that the reducing relief valve holds a hysteresis characteristic in that the over pressure condition is decreased to a limit that a power for holding the steering of the steering wheel admits.
Claim 19
Dependent Claim
29 words
1 8. An electrically driven oil pressured power steering apparatus as recited in Claim 4, further characterized in that the reducing relief valve is provided within the bypass valve.
Claim 20
Dependent Claim
49 words
1 9. An electrically driven oil pressured power steering apparatus as recited in Claim 15, further characterized in that the electronically operated on-off means is provided with a circuit element through which a reduced source voltage is applied to the electric motor by switching control of the semiconductor elements.
Claim 21
Dependent Claim
48 words
An electrically driven oil pressured power steering apparatus as recited in Claim 19, further characterized in that the control circuit of the semiconductor elements becomes active upon the fact that the speed exceeds a previously determined speed to thereby apply a reduced source voltage to the electric motor.
Claim 22
Dependent Claim
79 words
An electrically driven oil pressured power steering apparatus as recited in Claim 19, further characterized in that the control circuit of the semiconductor elements becomes inactive upon the fact that the speed exceeds another previously determined speed to thereby stop the electric motor and the performance is shifted to a state of the manual steering region through a semiconductor switching region in a state of power steering region from a relay-on region in the state of power steering region.
Claim 23
Dependent Claim
35 words
An electrically driven oil pressured power steering apparatus for an automobile substantially as herein described with reference to and as illustrated in Figures 1,2, or 3 and Figures 4 to 14 of the accompanying drawings.
Claim 24
Dependent Claim
35 words
An electrically driven oil pressured power steering apparatus for an automobile substantially as herein described with reference to and as illustrated in Figures 1,2, or 3 and Figures 4 to 14 of the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
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