BMW 7_aya the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and methods of operation
3. Settings and routine maintenance of the car
4. Engine
5. Cooling systems of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Cardan and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
12.1. General information, recommendations and security measures
12.2. Forward suspension bracket
12.3. Back suspension bracket
12.4. EDC system
12.5. Steering
12.5.1. Principle of work of GUR
12.5.2. Removal and installation of a steering wheel, block of a safety cushion and its contact ring
12.5.3. Removal and installation of casings of a steering column
12.5.4. Removal and installation of assembly of a steering column and sensor of an angle of rotation
12.5.5. Replacement of the lever of adjustment of a steering column
12.5.6. Removal and installation of the lock of ignition and blocking of a steering wheel
12.5.7. Removal and installation of the steering mechanism from GUR
12.5.8. Removal and installation of steering drafts, bipod and pendular lever
12.5.9. Removal and installation of the pump GUR
12.5.10. The angles of installation of wheels of the car - the general information
13. Body
14. Onboard electric equipment
15. Schemes of electric equipment



12-5-rulevoe-upravlenie.html

12.5. Steering

Principle of work of GUR

Design and principle of work of GUR

1 — the Shaft
2 — the Torsion
3 — the Screw
4, 5 — Zolotniks
6 — the Piston
7 — the Circulating tube
8 — the Shaft with the gear sector

9, 10 — Inlet valves
11, 12 — Radial channels
13, 14 — Final valves
15 — the Pump
16 — the Tank
17 — the Safety valve
18 — the Adjusting valve

In a case of the steering mechanism there is a steering mechanism assembled, a zolotnik of management and the working cylinder. Via the torsion (2) a steering shaft (1) it is elastic it is connected with the screw (3) and it is rigid - with zolotniks (4 and 5). Zolotniks are built in the distributor case in cross situation concerning a screw axis. Communication between the piston (6) and the screw (3) is carried out through the closed ball chain. At a screw provorachivaniye the circulating tube (7) takes away balls from one end of a chain and moves them by other end. The piston (6) is connected through gear gearing to the shaft (8) having the gear sector. The special profile of tooth of the sector of a shaft does possible elimination of a side play by means of the adjusting screw.

In the neutral provision of zolotniks (4 and 5) the oil given by the pump circulates in the mechanism of steering and through the inlet and final operating edges opened has free access in the cylinder.

The hydraulic drive enters work when zolotniks find a neutral way out. It occurs when the effort from a steering wheel or from a bipod of steering is transferred to the screw through a shaft with the gear sector and the piston. At the same time the torsion (2) acts as a binding element. Its flexible part has ability to be deformed and again to return zolotniks after removal of effort from a steering wheel in neutral situation. At a conclusion of zolotniks from neutral situation oil goes as well to the working cylinder, – it carries out power support in movement of a shaft of steering and counteraction at the blows caused by roughness of the road.

Steering wheel in neutral situation: from the bladed pump oil flows in the distributor case, via inlet channels (9 and 10) – to radial channels (11 and 12). From there it flows further through connecting openings to the right and left cavities of the cylinder, and then via open final channels (13 and 14) back in the tank.

The steering wheel is turned on / counterclockwise: the zolotnik (4/5) moves to the right, and the inlet channel (9/10) opens. The zolotnik (5/4) moves to the left, and the inlet channel (10/9) is closed. Thus oil gets into the right/left cavity of the cylinder, is pushed out from the left/right cavity of the cylinder and comes back to the tank.


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12.4.3. Replacement of sensors of a road gleam of EDC
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12.5.1. Principle of work of GUR