- Tatra T813
Tatra T813 was a
truck produced inCzechoslovakia by Tatra company. [ Moderní Uźitkové Automobily TATRA kolektiv vývojove konstrukce N.P. Tatra Kopŕivnice 1979 Naśe Vojsko Praha, První vydání] Infobox Automobile
name = T 813
manufacturer = Tatra
predecessor =Tatra T141
successor =Tatra T815
class =Heavy Truck
body_style =COE
engine =V12 diesel
transmission =
wheelbase =
length = convert|8800|mm|in|1|abbr=on (T813 KOLOS)
width = convert|2500|mm|in|1|abbr=on
height = convert|2780|mm|in|1|abbr=on (T813 KOLOS)
weight = convert|14000|kg|lb|0|abbr=on (T813 KOLOS)
fuel_capacity =
electric_range = 24 V 500 WGenerator , 24 V 5.8 kWStarter motor [T813 6x6,S1,NT,NTH] or 24 V 720 W / 30 AAlternator (sealed watertight), 2x 24 V 5.8 kWStarter motor s (sealed watertight) [T813 KOLOS]
related =
designer =Infobox Automobile engine
name = T 930-xx E
aka = T 930 E
manufacturer =Tatra
type =V12 diesel
production =
predecessor =
successor =
bore = convert|120|mm|in|1|abbr=on
stroke = convert|130|mm|in|1|abbr=on
displacement = 17,640cc
length =
diameter =
width =
height =
weight = convert|1035|kg|lb|0|abbr=on
block =Cast Iron
head =Aluminium alloy
valvetrain = OHV
supercharger =
turbocharger =
fuelsystem =Direct injection
fueltype =Diesel fuel
oilsystem =
coolingsystem =Aircooled
power = convert|198.6|kW|hp|0|abbr=on @ 2000 rpm
specpower =
torque = convert|990|Nm|ftlbf|abbr=on @ 1300 rpm
compression = 16.5:1
fuelcon = convert|44|L/100 km|abbr=on
specfuelcon =
oilcon =History
The first
prototype already built in1960 utilized existingTatra T138 assemblies in 4x4full time all wheel drive , which was also another first forTatra . After the initialtrials however the designers decided to develop and expand the concepts onto 8x8all wheel drive all-terrain vehicle . The basis of the design thus became the modular chassis of T813.Design and technology
The tubular backbone construction was once again selected. The main advantages of central load carrying backbone tube are in its high torsion and bend strength protecting truck body against load stresses. The advantage is also that it houses all important parts of the drive train as well as it enables a concept of modular construction where designers and customers can specify 4,6,8,
wheel drive and various lengthwheelbase combinations. The new cab ofCOE design was implemented as were the wide profile super singletyres and central tyre inflation/deflation system.Engine
The
naturally aspirated V12 engine T-930 was created by adding extra four cylinders to the existing T-928 75 degreeV8 engine, used inTatra T138 . Thecrankshaft consisted of six individual journals bolted together with front and rear pins all running on the main roller bearings and located onaxial friction thrust washers. Themilitary version was once again multi-fuel capable, running on mixtures ofdiesel fuel ,petrol andaviation kerosine fuel .Chassis
The
chassis is a full length backbone tube with independent swing half axles in 4x4, 6x6 and 8x8. On 4x4 models front axle suspension via adjustable torsion bars , 6x6 and 8x8 models front and rearaxles suspended bylongitudinal semi-elliptic leaf springs . For 4x4 configuration rear axle was suspended via theairbags suspension. Full timeall wheel drive fronttwin steer (6x6, 8x8) drive via homo-kineticdrive shafts , drive with thedifferential locks ,inter-axledifferential s with locks andplanetary hub reductions on all models.
*Front track
** 2050 mm (KOLOS)
*** 1990 mm (6x6 Hauler, S1, 8x8 Chassis)
**** 2300 mm (NT, NTH Prime movers)
*Rear track
** 2000 mm (8x8 KOLOS)
*** 1950 mm (6x6 Hauler, 8x8 Chassis, S 1)
**** 1990 mm (NT, NTH Prime movers)
*Wheelbase
**T813 KOLOS - 1650+2200+1450 mm
**6x6 Hauler - 1650+2700 mm
**8x8 Chassis - 1650+3200+1450 mm
**S1 8x8 - 1650+2800+1450 mm
**NT, NTH 4x4 - 3700 mm*
Ground clearance
** 380 mm (KOLOS, 6x6 Hauler)
*** 330 mm (8x8 Chassis, S1 8x8)
**** 300 mm (NT, NTH Prime Movers)Transmission
The main
gearbox was located behind the cabin and connected to an engine clutch housing via shortcardan shaft (this design enables a so called flat floor cabin) was bolted together with an auxiliarygearbox to atransfer case and then to a backbone tube and formed main part of a chassis structure. Options for the rearpower take off and or awinch drive were available. Main and auxiliary gears were fully synchronized except the first and reverse gear. The new feature was unique 2 speed planetary overdrive system bolted between front and rearaxles .The overdrive could only be selected manually whilst stationary. Auxiliary gearbox had a neutral position which allowed a winch and a power take off to use main gearbox gearing for variable speed operation. The final drives used Tatra gear differentials with locks, offset drive shafts and planetary hub reductions.
* Main
gearbox - 5+1 (2-5 gearsynchronized ) (KOLOS 8x8 & Hauler 6x6)
**gear ratios - (1)9.97, (2)4.96, (3)2.83, (4)1.68, (5)1.0, (R)8.58
* Main gearbox - 5+1 (2-5 gearsynchronized ) with splitter direct and overdrive (S1 8x8, Chassis 8x8,NT & NTH 4x4)
**gear ratios - (1)9.97, (2)4.96, (3)2.83, (4)1.68, (5)1.0, (R)8.58
*** splitter ratios - 1.0 (Direct) , 0.75 (Overdrive) (electro-pneumatic control via switch on the gear lever and clutch pedal activated )*Auxiliary
gearbox - 2 speed (electro-pneumatic control via switch on the gear lever and clutch pedal activated )
**gear ratios - 2.2, 1.62 (KOLOS & Hauler 6x6)*Step down
transfer case - single
** gear ratio - 1.68 (S1 8x8, Chassis 8x8, NT & NTH 4x4 only)*
Planetary overdrive
** ratios - 1.0 , 0.62 (KOLOS 8x8 & Hauler 6x6 only)*
Clutch - 3x plate dry (clutch pedal hydraulic and air power assisted)
** - 2x plate dry (clutch pedal hydraulic and air power assisted) (NT & NTH 4x4 only)
*Differentials
** 2x front and 2x rear (8x8 models)
***2x front and 1x rear (6x6 models)
****1x front and 1x rear (4x4 models)
** final drive
***ratios - 2.71
*Planetary hub reductions
**ratios - 2.14 (KOLOS 8x8), 2,12 (Hauler 6x6 & S1 8x8)Brakes
Full triple circuit air "S" cam
drum brakes acting on all wheels drums via slack adjuster, all brake cylinders were remotely vented. First brake circuit acts on front wheels , the second on rear wheels and the third controls trailer service brakes. Unique design feature was remotely mounted brake valve which was operated via hydraulic master and slave cylinder principle on the Hauler 6x6 or via mechanical linkage on 8x8 models.
* Main wheel brakes ----> dual circuit drum brakes "S" cam type
** Park brake ----> mechanical via outputshaft at the back of the gearbox
*** Supplementary brake ---->exhaust brake electro-pneumatically controlledBodywork
Cabin is all steel construction of COE design but not tiltable, the access to the
engine was provided via removable engine cowlings inside the cabin compartment. The cab came in two versions, the "short" two seater two door version and in the "long" "crew cab" seven seater four door version. The military specs cabs included the roof hatch or two in the case of the crew cab. All cabs were equipped with self contained diesel cab heater which could also be used in the winter to warm up the engine before starting it. Another military feature wasCTI central tyre inflation system controlled from the cab for each wheel independently and an ability to pressurize gearbox and differentials housing during water crossing. The 8x8 models had abilility to crosstrench es up to 1.4 metre wide andvertical obstacles up to 0.6 metre high. Water crossing depth (static including the wave) was up to 1.4 metre (KOLOS 8x8). The vehicle top speed was 92 km/h (NT & NTH), 80 km/h (KOLOS), 70 km/h (hauler), 60 km/h (S1) @ 2000 enginerpm .
* Vehicles WeightsProduction
Production of Tatra T813 began in 1967 and was superseded by
Tatra T815 in 1982. Models were available in the 4x4, 6x6, and 8x8 drive configurations for civilian and military use.** Primary models
* Tatra T813 "KOLOS" 8x8 - Military heavy haulage
* Tatra T813 Hauler 6x6 - Civilian heavy haulage
* Tatra T813 S1 8x8 - Heavy one way tipper
* Tatra T813 Cab-chassis 8x8 - Bodybuilders chassis for special use
* Tatra T813 NT & NTH 4x4 - Prime movers and special applicationsport
T813 has become extremely popular after fall of the
Iron Curtain in the West as an extreme off-road truck, participating at the various truck trials held acrossEurope .Links
* [http://www.europatruck-trial.com/Site-Neu/Reglement/reglement_englisch.php Europa Truck Trials pages]
* [http://www.hbro.co.uk/Events/Truck%20Trial/Truck%20Trial.htm Various truck trials pictures]
* [http://www.youtube.com/watch?v=46iSjM52xt4&feature=related Truck trials videosYouTube ]
* [http://www.youtube.com/watch?v=mq5mMVd3p1E Tatra T813 truck trial videoYouTube ]
* [http://www.youtube.com/watch?v=bCDZRGGM468&feature=related Videos of RC T813 model from MC-Maxim videoYouTube ]References
* "Modern Utility Automobiles TATRA by design team of N.P. Tatra Kopŕivnice", 1979, Naśe Vojsko, Prague, First edition
External links
* [http://www.tatra.cz Tatra a.s.]
* [http://www.tatraportal.sk/index.php?lang=en Tatra portal]
* [http://www.clearlight.com/~brawicz/tatra_trucks/ Unofficial Tatra trucks pages]
* [http://www.tatratech.wz.cz/ Unofficial Tatra pages czech only]
* [http://www.tatraprehled.com/index.php Tatra trucks gallery czech only]
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