MAZ-7907 is the experimental chassis of the Minsk Automobile Plant for the launcher 15U157 of the 15P162 Tselina-2 mobile soil missile system with the RT-23 UTTKh (15Zh62) ICBM. The only car in the world with 24 drive wheels , 16 of which are driven by an energy generator driven by a tank gas turbine. The chief designer of the chassis is the car designer Boris L. Shaposhnik , laureate of the USSR State Prize, laureate of the Lenin Prize.
| MAZ-7907 | |||||||||||||||
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| Manufacturer |  MAZ | ||||||||||||||
| Years of production | 1985 | ||||||||||||||
| Assembly | Minsk Wheel Tractor Plant | ||||||||||||||
| Class | cargo | ||||||||||||||
| Design | |||||||||||||||
| Wheel formula | 24 × 24/16 (4 front and 4 rear axles) | ||||||||||||||
| Engine | |||||||||||||||
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| Transmission | |||||||||||||||
| electric transmission: alternating current generator and 24 synchronous electric motors TE660-24 alternating current with air-oil cooling and frequency regulation | |||||||||||||||
| Specifications | |||||||||||||||
| Mass-dimensional | |||||||||||||||
| Length | 28 187 [1] | ||||||||||||||
| Width | 4100 [1] | ||||||||||||||
| Height | 4410 [1] | ||||||||||||||
| Clearance | 465 mm | ||||||||||||||
| Wheelbase | 4105 mm | ||||||||||||||
| Rear track | 3330 mm | ||||||||||||||
| Front track | 3330 mm | ||||||||||||||
| Weight | 65 800 kg [1] | ||||||||||||||
| Dynamic | |||||||||||||||
| Top speed | 25 km / h [1] | ||||||||||||||
| On the market | |||||||||||||||
| Other | |||||||||||||||
| Carrying capacity | 150,000 kg [1] | ||||||||||||||
| Designer | Boris Lvovich Shaposhnik | ||||||||||||||
The main technical features of the MAZ-7907 include the installation as a power plant of a gas turbine engine with a capacity of 1250 liters. with. (a specially designed and manufactured version of the GTD-1000TF - GTD-1000TFM tank gas turbine engine; according to other sources - the GTD-1250A) and a rather complex, but efficient electric transmission with 24 motor wheels with a diameter of 1.66 m.
The MAZ-7907 chassis underwent successful trial operation, however, it was not adopted for service; two prototypes of the MAZ-7907 chassis are stored at the MAZ training ground. The length of the machine is 28.1 m, width 4.1 m, height 4.4 m.
A small turning radius was provided by turning all pairs of wheels, except for the 5th, 6th, 7th and 8th. The first four pairs turned in one direction, and the last four in the opposite direction.
Content
History
Work on the lightweight (relative to MAZ-7904 ) articulated twelve-axle chassis MAZ-7907 with electric drive and eight - axis MAZ-7906 with mechanical drive began in Minsk on March 23, 1983 . [one]
On August 9, 1983, a decree of the USSR government was issued on the creation of a single missile RT-23 UTTKh "Molodets" for mine, railway and soil-based bases No. 768-247. The project of a mobile soil rocket complex was named "Tselina-2" and received a customer index of 15P162 . [one]
The first prototype was assembled at MAZ in March 1985 and was considered as an alternative chassis option under the Tselina-2 program. The chassis was supposed to be capable of transporting a rocket with a launch mass of 104.5 tons, a length of 22.6 meters and a diameter of 2.4 meters into a TPK and equipment providing storage, transportation, preparation and launch of a rocket. [one]
At the plant preliminary break-in and run tests in the volume of 1000 km were carried out. The tests were carried out at night on the Mogilev highway and the Utyos factory landfill. Upon completion of factory tests, the chassis was disassembled and sent by rail to Barrikady Production Center ( Volgograd ) for the installation of equipment for an autonomous launcher (APU) 15U157 . Upon completion of the installation, the chassis was again partially dismantled and sent by rail to the position area of the 7th Guards Missile Rezhitskaya Red Banner Division in the town. Vypolzovo (now ZATO closed) in the Bologovsky district of the Tver region for comparative tests with APU based on MAZ-7906. [one]
Tests of the MAZ-7907 chassis in the 7th Guards. RD began in September 1986 . The purpose of the tests was to select the type of chassis for the Tselina-2 PGRK. The tests required a major modernization of the military infrastructure: giant hangars were built to store and maintain the chassis, special sections of roads with bridges and interchanges to study the effects of wheels on the roadway. The tests were completed in September 1987, while the mileage of the MAZ-7907 was 2054 km at a maximum achieved speed of 25 km / h. [one]
The Commission, in the conclusions of the test results for production, recommended the MAZ-7907 chassis as having several advantages compared to the MAZ-7906 [1] :
- less axial loads
- ease of management
- the best vibro-acoustic characteristics in the cab,
- fast set of readiness for movement at low temperatures (due to the use of gas turbine engines ),
- the best operational qualities (due to the use of electric transmission),
- higher reliability and survivability (due to redundancy of electric transmission systems and the possibility of movement without 8 electric drives),
- better rail transport.
However, work on the complex was discontinued, and both MAZ-7907 vehicles were returned to the Minsk Automobile Plant. [one]
| External Images | |
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| Ship transportation | |
| A picture taken on a film camera during transportation. | |
| One more. | |
In the summer of 1996, using one of the MAZ-7907 chassis , an 88-ton ship 40 meters long was transported from the Berezina River over 250 km to Lake Naroch . After unloading the chassis in a pond, on the return trip all the electric motors failed and the chassis was returned in tow.
In 2006, one of the elements of two MAZ-7907 vehicles located at the factory site was assembled, which is now allegedly located on the territory of the enterprise awaiting restoration. It is assumed that this chassis will become one of the elements of the museum exposition of the Minsk Wheel Tractor Plant . [3]
Design
A spinal-type frame with a horizontal power hinge [3] connecting two six-axle all-wheel drive links was used on the chassis. [1] This solution, combined with an independent hydropneumatic ( English hydropneumatic suspension ) lever suspension with pneumatic connection of each two wheels on the chassis, a frame position adjustment system [1] and a large wheel travel, allowed the chassis to move along the complex ground profile without hanging the support points dear. At the same time, in the horizontal plane during cornering, this frame remained rigid. [3]
High maneuverability of the chassis is ensured by an automatic differential control system for turning the wheels [4] - four front and four rear axles are controllable, while turning the rear four axles rotates in the opposite direction. These measures made it possible to achieve a turning radius of 27 m with a chassis length of 28 m. [1]
As the engine, an improved version of the GTD-1000TF engine of the T-80B tank was used - the GTD-1000TFM gas turbine engine (according to other sources - GTD-1250A [2] ) with a capacity of 1250 liters. with. [one]
The engine rotated an alternator , which generated electricity and fed the entire electric transmission , consisting of 24 synchronous electric motors TE660-24 alternating current with frequency regulation [1] , installed inside the frame, one on each of the wheels. In connection with the incompleteness of the work of the allies to create a synchronous electric motor with full oil cooling, traction electric motors of air-oil cooling were used in the chassis. [3] Traction electric motors through the semiaxes brought the wheels with wide-profile tires of the VI-207 model (1660 × 670-685), produced at the Voronezh plant, into rotation. [one]
Notes
- ↑ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Colonel Nikolai Kachuk. Strengthening the nuclear missile shield of the Fatherland (Rus.) // Journal of the Armed Forces of the Republic of Belarus “Army”. - Minsk, 2007. - Issue. 64 . - No. 6 . - S. 48-53 . - ISSN 1819-0790 . Archived January 3, 2011.
- ↑ 1 2 Experimental and experimental engines based on the GTD-1000 . Panzer-Marsch (March 20, 2002). Date of treatment July 13, 2012. Archived April 21, 2012.
- ↑ 1 2 3 4 V. Chekhut. The store is closed due to the passage of the boat // Truck Press. - 2007. - No. 8 . Archived on September 18, 2010.
- ↑ Igor Denisovets. MAZ-7907 (inaccessible link) . Self-made bureau . Date of treatment July 13, 2012. Archived April 21, 2012.
Links
- A photo
- Club 24x24: MAZ-7907
- Nikolay Korzinov. Dinosaurs of the Country of the Soviets: great traction . Popular mechanics (October 2007). “Since the machine was never adopted, it can be stated that this is the only 12-axle all-wheel drive tractor in the world.” Date of treatment July 13, 2012. Archived July 13, 2012.