Subaru Forester

1997-2005 of release

Repair and car operation



Subaru Forester
+ Cars Subaru Forester
+ The maintenance instruction
+ Routine maintenance
+ The engine
+ Systems of cooling, heating
+ The power supply system and release
+ Engine electric equipment
+ Control systems of the engine
- Gear change box
   - 5-step manual box of a gear change (РКПП)
      The general information
      Removal and installation of a box of a gear change
      Preparation for performance of repair work on restoration РКПП
      Dismantling and assemblage of a distributing box, service of components
      Major repairs РКПП of all-wheel drive models
      Service of a drive of a gear change
      Service of the lever of switching of a distributing box
   + 4-step automatic transmission (АТ)
+ Coupling, трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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5-step manual box of a gear change (РКПП)

The general information

For a complete set of models of cars considered in the present Management are used a 5-step manual box of a gear change (РКПП), or 4-step automatic transmission (АТ).

In the given part of the present Chapter manual boxes of a gear change are considered, and also assemblage of a distributing box, is devoted automatic transmission the Part 4-step automatic transmission (АТ).

In view of complexity of design РКПП, absence on free sale of necessary replaceable internal components and necessity of use of the special equipment, composers of the present Management do not recommend to owners of cars to carry out transmission major repairs independently. Repair of a box in the conditions of a car-care centre workshop is enough expensive operation, in a kind of that, it is necessary to consider alternative variants of replacement of the failed block new or restored. Any helpful information on repair and transmission replacement can be received on company Subaru car repair shops. Without dependence from the chosen way of elimination of problems (repair or replacement), independent dismantle of a box from the car will allow to reduce material inputs essentially.

Models with a constant drive on all wheels (Full Time)

Design РКПП, used for a complete set of models with a constant full drive

1  —  Carter РКПП
2  — the  Conducted gear wheel of intermediate transfer of a drive of back wheels
3  — the  Shaft of a leading gear wheel of the main transfer
4  — the  Secondary shaft
5  —  Vjazkostnaja муфта
6  —  Interaxal differential
7  — the  Leading gear wheel of intermediate transfer of a drive of back wheels
8  —  Lengthening

 


For a basis of a design of transmissions of all-wheel drive models are taken РКПП front-wheel cars Subaru (Legacy, Impreza, Outback) which preliminary unite in the uniform block with a distributing box. In a distributing box the interaxal differential and intermediate transfer of a drive of back wheels is established.

The interaxal differential is supplied вязкостной муфтой, established between its target shaft.

Many details of transmissions of all-wheel drive models, such as: the basic картер, the primary shaft, forward differential, etc., are unified with details of the boxes used on front-wheel models of class Legacy/Impreza/Outback.

Besides the five-step are issued also ten-step РКПП which besides the basic 5-step mechanism are supplied also by a 2-step reducer established ahead of a primary shaft and allowing to change the general transfer relation of a box by a choice of a raising or lowering mode of the functioning.

Models with a disconnected drive of back wheels

Design РКПП, used for a complete set of models with a disconnected drive of back wheels

1  — the  Conducted gear wheel of intermediate transfer of a drive of back wheels
2  — an  inclusion Rod муфты
3  — the  Conducted gear wheel of intermediate transfer of a drive of back wheels

 


In assemblage of distributing box РКПП of the given type intermediate transfer of a drive of back wheels with possibility of switching-off by means of gear муфты is established. The interaxal differential in such boxes is not used.

Design and principle of functioning of interaxal differential

Design of interaxal differential with вязкостной муфтой

1  —  From secondary shaft РКПП
2  —  To a shaft of a leading gear wheel of the main transfer of a drive of forward wheels
3  —  To a shaft of a leading gear wheel of intermediate transfer of a drive of back wheels

 


The interaxal differential is executed under the planetary symmetric scheme on conic gear wheels. Feature used on models of interaxal differentials considered in the present Management is application included between target shaft вязкостной муфты.

Thanks to such design of interaxal differential the best redistribution of traction effort on car driving wheels is reached, stability of a vehicle raises, its controllability improves, in particular at movement on a slippery road covering.

In the case вязкостной муфты some disks (plates) with the external and internal gearing, located serially are established.

Design вязкостной муфты interaxal differential

1  — the  Cover
2  — the  Case
3  — the  Nave
4  — the  Disk with internal gearing
5  —  Prostavochnoe a ring
6  — the  Disk with external gearing
7  — the  Epiploon

 


Disks with external gearing are equipped by the teeths located from their external edge and entering into gearing with internal шлицами of the case муфты. Teeths of disks of internal gearing, in turn, enter into gearing with external шлицами on a nave surface.

For distributing of disks with external gearing between them are established special проставочные rings. Between disks with internal gearing of such rings there are no also they can freely move on шлицам naves in the axial direction, everyone - between two adjacent disks of external gearing.

The internal cavity муфты is filled by a special silicone liquid. Two epiploons executed in the form of rings of H-shaped section, prevent вытекание liquids from муфты.

The liquid nevertheless can filter from муфты under the influence of internal pressure that lead to an assemblage exit out of operation. Pressure inside муфты raises, when angular speeds of rotation of forward and back wheels considerably differ from each other for a long time that can occur during towage of a vehicle to a separation of one of axes from the earth.

Use вязкостной муфты allows to redistribute a twisting moment between forward and back driving wheels, for example, at car movement on slippery road when the factor of coupling of wheels with a covering can vary considerably. As a result of functioning муфты больший the twisting moment is necessary on the wheels rotating with smaller angular speed. During movement on direct road with a good covering, the twisting moment is distributed between forward and back wheels in regular intervals.

The safety mechanism of inclusion of transfer of a backing

Design of the safety mechanism of inclusion of transfer of a backing

1  — the  Sleeve
2  — the  cam Platen
3  — the  Cam
4  — the  Returnable spring of the platen
5  — a  cam Spring
6  — the  Persistent plate

7  — the  Lock ring
8  — the  Spring
9  — the  Ball
10  — the  Sealing ring
11  — the  switching Lever
12  — the  Adjusting lining


Sleeve (1) safety mechanisms bolts привернута to картеру transmissions. The platen (2) is placed in a sleeve. Freely turned cam (3) kept in a sleeve by a special ledge is put on narrower end of the platen.

The returnable spring established inside (4) wrings out the platen to the left, besides, the spring (5) established between a cam and a sleeve wrings out a cam also to the left and in a rotation direction. Both springs rest against a plate (6) which is established in a sleeve and is fixed by a lock ring (7). The platen is equipped лыской, (8) balls providing by means of a drawn in spring (9) additional fixing at inclusion of transfer of a backing.

Section А-А

1  — the  Sleeve
2  — the  cam Platen
3  — the  Cam
4  — the  switching Lever

 


Apparently on section А-А, a sleeve (1) and the platen (2) cams are equipped by cuts, and, the end of the lever of switching (11) settles down between them (on an illustration the lever is shown in neutral position of a box). Extreme left position of the lever corresponds to a choice of 1st or 2nd transfer, extreme right - to 5th and back transfers.

At inclusion of 5th and back transfers the lever simultaneously presses on the platen (2) therefore the cam (3) moves to position of a choice of corresponding transfer. When the switching lever ceases to wring out the platen, the cam comes back in a starting position under the influence of the effort developed by a spring (5).

At attempt of switching from 5th transfer on back the lever (11) is displaced towards reverse gear inclusion, wringing out the platen (2) and causing поворачивание a cam (3).

Kind Z


1  — the  Sleeve
3  — the  Cam
6  — the  Persistent plate
7  — the  Lock ring

 


The cam is equipped by a stopper resting against a plate (6) and preventing its undesirable moving. As a result the lever stops, having turned a cam only on some limited corner corresponding to position of neutral transfer in which it comes back under the influence of a spring (4).

At inclusion of a reverse gear the lever moves to the corresponding party, simultaneously wringing out the platen (2) and a cam (3).