F300-SR-Steering-Part1
| 
| 
PART 1 - PART 2 - PART 3 - PART 4 - PART 5 - PART 6 - PART 7 - PART 8 - PART 9 - PART 10
|
|
DAIHATSU
11
O
O
O
STEERING
OUTLINE OF STEERING SYSTEM SR- 2 COMPONENTS SR-16 THOUBLESHOOTING SR~18 IN-VEHICLE INSPECTION SR-19 STEERING WHEEL SR-31 STEERING COLUMN SR-34 STEERING LINKAGE SR-57 STEERING GEAR HOUSING SR-70 VANE PUMP SR-85 SSTs (Special Service Tools) SR-97 SERVICE SPECIFICATION SR-97 TIGHTENING TORQUE SR-98
|
|
STEERING
OUTLINE OF STEERING SYSTEM
The steering gear box employs a recirculating ball type. Furtherm0re, the power steering is available as
optional equipment. The steering column employs a rigid type for the general and Australian specifications absorption type for the ECE & EEC specifications.
and an impact
The tilt steering is standard equipment on the EL grade, while it is optional equipment on the DX grade.
The steering linkage consists of a pitman arm, a relay rod, an idler arm and tie rods.
|
|
STEERING
. Steering specifications
Specifications
Item W
Tyre size I
Turning angle degrees inner
., 31°
, , l
Minimum turning radius rn T,ire 5-1 5.7
STEERING WHEEL
The steering wheel is available in two materials: urethane and polypropylene. The urethane-made steering wheel is standard on the EL grade of the resin top vehicle; the EL package of the soft top vehicle. Also, it is optional equipment on the DX grade of the resin top vehicle. (On those vehicles equipped with the urethane made steering wheel. the transmission shift lever knob is also made of urethane.) Other vehicles uses the polypropylene-made steering wheel.
Polypropylene-made Urethane-made
|
|
STEERING
STEERING COLUMN
The steering column employs the rigid type for the general and Australian specifications and the shock absorption type lor the ECE & EEC and GCC specifications. The tilt steering is provided as standard on the EL grade vehicle.
Shock absorption type
ISLE
Rigid with tilt type
Shock absurption type
|
|
. INTERMEDIATE SHAFT
The intermediate shaft shown inthe figure below is provided between the steering main shaft and the steering gear box.
Crnssssetion B-B Crosssection c-c Cmsssmion A-A
STEERING MMN SHAFT
The steering main shaft comes in two kinds: one for the general and Australian specifications and the other for the ECE & EEC specifications. The steering main shaft for the ECE & EEC and GCC specifications employs an impact absorption type steering main shaft which uses resin.
General and Australian specifications
ECE ll EEC and GCC specifications
Resin
|
|
STEERING
As regards the steering gear box, the manual steering (recirculating ball type) is standard, where as the power steering (integral type) is optional.
Manual 1yPE
Steering gear box specifications
Man'-'ai TYP9 1 Power steering W 7
Type | Recirculating ball type
Gear ratio I 24 - 28
Integral 13/D9
19.8
Lower limit I 460 cc'
|
|
POWER STEERING
The power steering consists of the following components: avane pump which generates a hydraulic pressure, an integral type gear box which detects a force being applied to the steering system. controls the hydraulic pressure and converts the hydraulic pressure to a mechanical power, an oil reservoir which stores hydraulic fluid. and those hoses, pipes, etc. linking these components.
wvao-sncno OIL RESERVOIR "
The oil reservoir is a tank which stores the hydraulic fluid sent to and returning from the steering gear box. The oil resenroir V: r consists of a strainer which filtrates hydraulic fluid, a Ievei Leiefgauge “mg pon gauge for checking the fluid level and so forth. This oil reservoir
|
|
VANE PUMP
The vane pump consists of a cam ring. a pump rotor, vanes _and so forth. A flow control valve which controis
the fluid flow rate according tothe revolution speed is incorporated at the rear section of the pump.
Discharge port Suction port
4- A
Rotor shaft §uction
1- A
Cam nng Holor
port
Crnsssection A-A
Vane pump specifications
Revolution speed used fbm | 500 7000
Fluid
7
Power steering fluid II)
-40-120
*For the United Kingdom
SR-8 f
|
|
Suction operation The volume of a space between the cam ring and the roior partitioned by a vane plate increases as the rotor rotates. As the volume starts to increase, the fluid is sucked from the suction port of the rear plate.
La
Rotor Rear plate
Suction port R010" Re* Van plate
Discharge operation The volume of a space between the cam ring and the rotor partitioned by a vane plate decreases as the rotor further rotates. The sucked fluid is, therefore. sent to the flow control valve from the discharge port of the rear plate through the oil passage in the housing. In this way, the fluid flow rate to the gear housing is controlled. Furthermore, the vane plate is pushed against the cam ring owing to a centrifugal force applied to the vane plate and a hydraulic pressure applied to the back of the vane, thereby preventing leakage.
Discharge port
A nulul Dnscharge port
Van mate
|
|
FLOW CONTROL VALVE
The flow control valve controfs the flow rate of the fluid in aceordance with the engine revolution speed (vane pump revolution speed). The flew control valve improves the steering feeiing by providing a light steering iurning effort during iow-speed operations and a certain extent of the steering turning effort during high-speed operations.
Sectional construction
OPERATION OF FLOW CONTROL VALVE During low revolution speed period The pump delivery pressure P1 is applied to the right side of the How control valve. while the pressure P2, i.e. pressure after the fluid has passed through the orifice. is applied to the left side. When the pump revolution speed is low, the passage at the pump suclion side is closed. Therefore, the fluid which increases corresponding to the pump revolution speed is directly sent to the gear housing.
l i
1 Pump sucilon side Passage ai Pump
I suction side
pl OHHCS
