1990 — 2001 of release
Repair and car operation
+ Identification numbers of the car
+ Governing bodies
+ Settings and routine maintenance
+ cooling and heating Systems
+ Power supply system and release
+ engine Electric equipment
+ Control systems of the engine
- Manual transmission
+ 5-step manual box of gear shifting (RKPP)
- Automatic transmissions (AT)
General information and functioning principle
AT problem diagnostics - the general information
The adjustments made without removal of AT from the car
Removal and installation of the pallet of a case of AT
Removal, installation and adjustment of the sensor switch of permission of start
Removal and AT installation
Major maintenance of AT
+ Transfer case
+ Coupling and transmission line
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
Automatic transmissions (AT)
General information and functioning principleAT F3А21 design
Design of AT of the F4А20 series (F4А22 and F4А23)
Scheme of functioning of a planetary transmission
Scheme of functioning of a planetary transfer case
For a complete set of models considered in the real Management 4-step AT of the F3А20 series (F3А21) and F4А20 (by F4А22, F4А23, F4А33 and F4А51) are used. All transmissions are equipped with the being blocked converter of rotation. The converter provides direct coupling between the engine and driving wheels of the car. Transmissions can have electronic control, - in this case the onboard processor makes box switching on raising or lowering transfer, being based on the analysis of information arriving from three electromagnetic blocks, established on the case of klapanny assembly.
In view of complexity of a design of AT, absence on free sale of replaceable internal components, and also need of use of the special equipment, originators of the real Management do not recommend to owners of cars to carry out major maintenance of transmission by own forces. In the present Chapter procedures of diagnostics of the general refusals of AT, its routine maintenance, the main adjustments, removals and installations are considered only.
Sometimes, in case of serious breakage, it is more reasonable and simpler to replace transmission, than to waste time and funds for restoration of the failed assembly. Regardless of the chosen way of introduction of refused AT in action, independent performance of its removal and installation will help to cut down substantially expenses (before make sure that transmission really needs regenerative repair).
Design and functioning principle
Generally automatic transmission consists of the converter of rotation, distributing assembly and differential. Transmission of F3А21 represents 3-step AT with a mechanical control. The F4А20 series differs a 4-step design and has electronic control.
Internal device of transmissions of both series almost equally. The main difference consists in use of raising 4th transfer on F4А20 series assemblies. Transmission consists of the 3-element converter of rotation with operating regulator (F3Ç20 series), couplings of coupling of the converter (F4Ç20 series), one planetary assembly, one brake tape and three (F3Ç20 series) or four (F4Ç20 series) of multidisk couplings of coupling.
Planetary assembly of transfers consists of two planetary ranks. The structure of a transfer case includes a planetary row with frictional elements of management (the blocking coupling and a brake). Work of all transmission the electronic block operates. Switching of high-speed modes is made by means of the car established in salon selector growling. The selector is connected by means of a cable to klapanny assembly, and with its help it is possible to set a range of used transfers. Besides the selector in salon for a task of special modes of functioning of transmission it is provided one or several switches.
For prevention of breakages of AT at the wrong choice of a high-speed range, for example, moving from “D” in “R” on the lever of the selector the clamp is provided, - "dangerous" switchings can be carried out only at the pressed button of a clamp. Application of a clamp allows to avoid a situation when on imprudence one of ranges of movement and the car can be included will start to move uncontrolledly. The lever of the selector can be established in one of six fixed provisions: "R", “R”, “D”, “N”, “2” and “L”, purpose of each of which is considered below.
Gets out at a car parking. In this situation, in transmission all elements of management are switched off, and its target shaft is blocked, - movement of the car is impossible. To transfer the selector to the situation "R" follows only after a full stop of a vehicle.
Backing. To transfer the selector to a position of "R" it is possible only after a full stop of a vehicle.
Neutral situation. In a box all elements of management that provides absence of rigid kinematic communication between her leader and conducted in bulk are switched off. The mechanism of blocking of a target shaft is thus switched off, i.e. the car can freely move. It is not recommended to switch transmission in the situation "N" at movement nakaty.
Main mode of movement. Provides automatic switching with the first on the fourth transfer. It is recommended at movement in normal conditions.
Movement on the first three transfers is authorized. It is recommended to use at movement on the hilly road or in the conditions of frequent stops (an intense city cycle).
14 movement only on the first and second transfers Is authorized. It is recommended to use, for example, on twisting mountain roads. Switching on the third and fourth transfers is forbidden. On this range the mode of braking is effectively used by the engine.
Movement only on the first transfer is authorized. This range allows to realize as much as possible a mode of braking by the engine. It is recommended at movement on abrupt descents, liftings and off road terrain.
OD mode (F4А20 series transmission)
Permission to use of the fourth, raising, transfers is carried out by means of the special OD button. If the button is in the drowned condition and the lever is established in situation "D", switching on raising transfer is authorized. Otherwise inclusion of the fourth (raising) transfer is forbidden. The control system condition in this case is determined by a control lamp of "O/D OFF". In case of permission of raising transfer the indicator does not burn, at a ban, - burns. The mode is used at movement with constant speed on direct sites of the highway. It is necessary to avoid OD mode use in city conditions, especially in a winter season when braking by the engine gains the vital value. It is not necessary to include also a mode of raising transfer at a full load of the car.
Special programs (if are provided)
On cars from AT two control modes by gear shifting are put: "economic" (NORMAL) and "sports" (POWER). The choice is carried out by means of the special switch which has been built in in the central console of the car.
Economic mode (NORMAL)
In this mode the minimum consumption of fuel takes place. Gear shiftings occur in the middle of the corresponding ranges of the engine, nature of movement of the car quiet, smooth.
Sports mode (POWER)
At inclusion of this mode on the panel of prior the control lamp of "ECT POWER" lights up. In this mode there is the maximum selection of engine capacity, - switching of a box is made in the top border of the corresponding ranges of turns of the engine. Acceleration performance of the car substantially increases, fuel consumption, respectively, increases.
The structure of a planetary transmission includes three planetary rows, three blocking couplings, four brakes and three couplings of a free wheeling.
The capacity from the engine via the hydrotransformer is transferred to an entrance shaft of a planetary transmission.
Gear shifting is carried out by inclusion of a certain combination of brakes and couplings of a free wheeling therefore frequency of rotation of a target shaft changes.
Elements of a planetary transmission
The function chart of planetary assembly of an automatic transmission is presented on an illustration.
The blocking coupling of a raising planetary row (С0) connects both solar drove also a solar wheel of a raising planetary row.
The brake of a raising planetary row (В0) stops a solar wheel of a raising planetary row.
The No. coupling of 1 free wheeling (F1) at the included brake of the second transfer forbids rotation counter-clockwise solar gear wheels of forward and back planetary ranks.
The coupling of a forward course (С1) connects an entrance shaft and эпицикл a forward planetary row.
The brake of the second transfer (В2) stops an external ring of the coupling of a free wheeling No. 1, forbidding that rotation of solar gear wheels of forward and back planetary ranks counter-clockwise.
The brake of the 1st transfer and backing (В3) stops drove a back planetary row.
The coupling of a free wheeling No. 2 (F2) forbids rotation drove a back planetary row counter-clockwise.
The coupling of direct transfer (С2) connects an entrance shaft and solar gear wheels of forward and back planetary ranks.
The brake of providing a mode of braking by the engine on the second transfer (В1) stops rotation of solar gear wheels of forward and back planetary ranks.
The coupling of a free wheeling of a raising planetary row (F0) at start of the engine connects a solar gear wheel and drove a raising planetary row.
Planetary transfer case
The scheme of functioning of a planetary transfer case is presented on an illustration.
The transfer case contains one planetary row, two blocking couplings and one brake.
Elements of a planetary transfer case of transfers:
The coupling of a forward course (SZ) connects a target shaft of a transmission to the satellite of a planetary number of a transfer case of transfers.
The coupling of direct transfer (С4) connects a shaft of a drive of back wheels and a leading asterisk of chain transfer of a drive of forward wheels.
The coupling of raising transfer (В4) stops rotation эпицикла a planetary number of a transfer case.
Device of a hydraulic part of a control system
The hydraulic part of a control system consists of the oil pump, klapanny assembly, electromagnetic valves, couplings and brakes, and also the channels connecting among themselves listed elements. Pressure of working liquid created by the pump is used for management of frictional elements of transmission, hydrotransformer and greasing feed. In klapanny assembly three electromagnetic valves of switching are established. With their help the electronic block exercises administration of gear shifting and hydrotransformer blocking.
Electric part of a control system (F4А20 series transmission)
The electric part operates gear shifting in a transmission and a transfer case, and also the blocking coupling of the hydrotransformer. It consists of three parts: sensors of speed of movement of the car (VSS), the sensor of provision of a butterfly valve (TPS) and the other information sensors tracing parameters of a condition of transmission and transferring data to the electronic control unit; the electronic control unit which on the basis of the analysis of data arriving to it defines the switching moments in a transmission and a transfer case, and also operates the blocking coupling of the hydrotransformer; and the executive part consisting of four electromagnetic valves.