『 陸軍武器 』－ M9 (ACE) 裝甲戰鬥工程車

克里斯Chris

Armored Combat Earthmover - (M9 ACE)


DESCRIPTION: The M9 is a highly mobile, armored, amphibious combat earthmover capable of supporting forces in both offensive and defensive operations. It performs critical combat engineer tasks such as digging hull defilade fighting positions for guns, tanks and other battlefield systems to increase their survivability. The ACE breaches berms, prepares anti-tank ditches, prepares combat roads, removes roadblocks and prepares access routes at water obstacles.

The engine, drive train and driver's compartment are laid out in the rear of the vehicle, while the front features an 8.7 cubic yard bowl, apron and dozer blade. Armor consists of welded aluminum with selected steel and aramid-laminated plates. An armored cupola containing eight vision blocks covers the driver's compartment. The vehicle hull is a welded and bolted aluminum structure with a two speed winch capable of 25,000 pound line pull. Towing pintle and airbrake connections are provided. It is equipped with a unique suspension system which allows the front of the vehicle to be raised, lowered, or tilted to permit dozing, excavating, rough grading and ditching functions. In addition, the M9 has armor protection against small arms and artillery fragmentation, a smoke screening capability and chemical-biological protection for the operator. It is capable of 30 MPH road speed, is transportable in C-130, C-141, and C5A aircraft and can swim at 3 MPH under ideal conditions [though with the deletion of the swim mission, swim related components are no longer required to be maintained for the M9 ACE].

By raising the dozer blade and using its scraper blade, the ACE can fill itself with ballast to improve dozing efficiency. Another key feature of the M9 is its unique hydropneumatic suspension system. The principal components are eight high-pressure hydraulic rotary actuators (four on each side) which connect to the roadwheel stations. During high-speed travel, this system assures a smooth ride through the use of shock-absorbing accumulators. In earthmoving operations, the operator rotates the actuators, thus lowering the apron and blade for digging.

克里斯Chris

M9部署示意圖


A typical combat engineer battalion will contain 22 ACES - seven per company plus an operational readiness float. The active Army has a total of 447 M9 ACEs.

STATUS: Insufficient funds were available to purchase all Armored Combat Earthmovers (ACE) required during initial and subsequent procurements. A total of 448 systems have been fielded with 57 additional ACEs needed to complete fielding to 87 percent of Force Package II and prepositioned stocks. In addition Phase III of the System Improvement Plan has yet to be started. This phase includes a variety of track, hull and blade enhancements. Microclimatic cooling system is planned to be fielded FY 96. System Improvement Plan Phase I & II is complete. Phase III & IV is under development.

The M9 ACE System Improvement Plan (SIP) is a multi-phased program designed to improve the performance, durability, readiness and MANPRINT characteristics of the vehicle. The multi-phased nature of the program is necessitated by the available funding stream. SIP Phase 1 consisted of: bolt-on front track retainers, steel skid plates, high pressure hydraulic filters, battery box deflector, scarifier blade uplocks, scarifier blade for half the fleet, inserts for improved winches, ejector debris shield, and modified rear bump stops. Kits were applied at units by depot and DOL teams during 1993 and early 1994. SIP Phase 2 consists of: thicker roadarm retainers, preformed radiator hoses, lengthened oil drain line, redesigned parking brake linkage and steering rod, vent fan filter, tachometer/ speedometer grease fittings, inclinometers, and steel CB/GS linkage. They are funded for and installed by units or through attrition.

克里斯Chris

SIP PHASE 3 - DETAILED DESCRIPTION OF PROJECTS

Hardened track pin with modified track shoe - Current track pins bend, causing NMCM time in two different ways. They deform the bushings, resulting in track maintenance, and they are difficult to remove when bent. Harder track pins will allow higher torque which will reduce bending moment. This will reduce frequency of track failures and make pin removal easier when track needs to be separated. In addition to the hardened pins, future buys of track will also have a larger pocket for the track pin nut. This will make it easier to get a socket on the nut even after the track edges get worn.

Hydraulic troubleshooting procedures - Reformat all hydraulic troubleshooting procedures to simplify fault isolation. The ACE has an extensive and complex hydraulic system. Insufficient hydraulic troubleshooting expertise is the single largest contributor to M9 NMCM downtime. It also contributes to NMCS time because good components are being removed and replacements ordered unnecessarily. Unit mechanics require detailed and complete troubleshooting procedures which are easy to use. Goal is to cut troubleshooting time and eliminate ambiguous or faulty troubleshooting paths. No hardware changes to the vehicles are included in this project.

Actuator mounting rings - Provide a stronger mounting system for the rotary actuators. Currently, actuator mounting bolts screw into steel inserts in the aluminum hull. The inserts pull out, resulting in loose actuators, hull damage, hydraulic line failures and damage to roadarms and actuators. Under this project, steel rings will be fastened inside the hull. The actuator bolts will pass through the existing mounting points and screw into the steel rings. The field modification installs rings at the front actuator station only; however, the rings can be installed at the three other stations as well if those hull inserts should come loose.

Bowl access plates - Provide easy access to the front actuators for troubleshooting and maintenance. Front actuators, accumulators and hydraulic lines require both scheduled and unscheduled maintenance. Currently, mechanics must perform troubleshooting and repairs from underneath the ACE, working in dark and cramped conditions. This increases maintenance time and leads to leaking hydraulic fittings. Access through the bowl floor will decrease maintenance time and eliminate most causes of actuator hydraulic leaks.

Hydraulic filtration improvements - Hydraulic cleanliness is critical on the ACE. To achieve the cleanest possible hydraulic system, a more efficient return line filter and a high pressure filter at the compensating pump output will be added. Three hydraulic tests points are being added at the high pressure filters. Also as part of this project, the two compensating pump suction hoses will be modified to prevent collapse and cavitation. Finally, the compensating pump adjustment will be improved by replacing the existing adjusting clamp with an adjusting screw and jam nut.

Hub and sprocket redesign - Current hub requires two unique sprockets. The outer one tends to bend and is difficult to fabricate, resulting in producibility delays and lengthy NMCS downtime. This project will eliminate the current outer sprocket and permit use of the inner sprocket in both positions. Goal is to eliminate shortages and higher cost of outer sprockets, and reduce maintenance burden. Also, the hub will be piloted onto the final drive output shaft, reducing the shear load and resultant failure of mounting bolts.

Semi-automatic track tensioner/adjuster - Currently, the operator checks and manually adjusts track tension using a grease gun before each mission. The new system will allow the operator to adjust track hydraulically from within the driver's compartment. With the manual system, the tension setting is a compromise, since the track needs sufficient slack to allow the suspension to go from sprung mode (travel) to unsprung mode (dozing). The semi-automatic track tensioner will relax the track to change between sprung and unsprung and then re-tension the track allowing a tighter envelope. This will reduce the number of track throws and associated damage and wear to suspension components and adjacent hull components.

Final drive improvements - Design an oil level indicator and modify the output shaft. Operators cannot assess the condition or lack of oil because there is no method to check oil level. This project will permit detection of water, contamination or loss of oil. Also, the output shaft will be modified to accommodate the redesigned sprocket hub.

Improved winch - With the current winch, the ACE has a limited ability to self-recover. This project will increase winch rating from 25,000 lbs to 35,000 lbs, double cable length from 100 feet to 200 feet, and add a friction brake to enable the M9 to hold a load on a slope.

Steel dozer blade - Develop a steel replacement for the existing aluminum dozer blade. The current aluminum blade suffers damage when used in rocky terrain, is marginally suited for use with scarifier teeth, and generally wears down. Repair is difficult and involves time-consuming aluminum welding, resulting in extensive mission downtime. The complex hollow-box design also means that replacement blades are very expensive and have long leadtimes. A steel dozer blade will be less expensive, more resistant to wear and easier to repair if damaged.

Automatic blade folder - This project is now part of SIP 4 - Let the operator remotely fold or unfold dozer blade from the crew compartment. This procedure now takes up to 1/2 hour to perform, requires crew to be exposed and stops the ongoing mission. Failure to fold the blade during cross-country travel could result in vehicle damage or operator injury. This project is not a readiness enhancement, rather it offers a major performance improvement to the mission.

克里斯Chris

EMPLOYMENT CONCEPT: The M9 is capable of performing mobility, countermobility and survivability tasks in support of light or heavy forces. Tasks to be performed are the excavation and preparation/reduction of obstacles, bridging operations, battle positions, strong points, and protective emplacements for command posts, air defense, communications equipment and critical supply/logistical bunkers. Other major tasks will be route clearing and maintenance in conjunction with both defensive and offensive operations.

In Operation Desert Storm the M9 Armoured Combat Earthmover (ACE) performed exceptionally well in support of combat operations. The ACE proved to be a successful combination of armoured vehicle and combat earthmover that was capable of keeping pace with the manoeuvre units, while providing crew survivability. While not as efficient as the D7 Dozer in earth moving, its ability to move with manoeuvre forces over several hundred kilometres of desert allowed it to successfully perform a wide variety of missions such as construction of combat roads and trails, survivability positions and berms. It is however, a fallacy that the ACE can move as fast as an M1 or M2. The vehicle is governed to prevent this.

But the training of ACE operators appeared to he inadequate. Operators were unfamiliar with the techniques associated with dozing, scraping, cut and fill ops, and grading. The ACE experienced trouble in reducing the berms associated with Iraqi tank ditches (berm on enemy side). Due to the location of the driver in relation to the vehicle blade, he cannot see the blade or determine when he is about to tip over. The ACE needs a front mounted telescope or a side mounted periscope to overcome this deficiency. The ACE led the way in breaching the border berm between Saudi Arabia and Iraq, and in reducing trench-lines during the assault breach. In both instances the ACE performed extremely well. Problems were encountered, however, due to the ACE's shortcomings. One commander referred to the ACE operator as "Alone, Unarmed, and Unafraid". This highlights the ACE's major shortcomings as a piece of mobility equipment used during direct fire engagements. ACE operators, usually 19 year old PFC's, led the 7th Corps breach into hostile country, alone, unarmed and unafraid. Fortunately, they met with very light resistance. Otherwise, mortality among ACE operators would have been very high. The ACE is a single operator vehicle, without the moral and physical advantages of a crew with an NCO in charge, and without the advantage of a weapon for local suppression. Habitually, manoeuvre task forces provided two Bradley Fighting Vehicles to protect the ACE during breaching ops. While this is a high price to pay for protection of one vehicle, commanders deemed it necessary for the success of their operations. Commanders felt that the ACE needs an additional crewman and a protective weapon such as the .50 calibre's machinegun, or the Mark 19 automatic grenade launcher

克里斯Chris

BASIS OF ISSUE:

7 per Engineer Company in a Heavy Division

6 per Armored Cavalry Regiment

6 per Engineer Company, Heavy Separate Brigade

6 per Engineer Combat Company (Mech) Corps

6 per HHC, Engineer Battalion, Light Infantry Division

4 per Engineer Company, Separate Infantry Brigade (Ribbon)

2 per Engineer Company (Assault Float Bridge)(Ribbon) at Corps

1 per Engineer Company (Medium Girder Bridge)

1 per Bridge Company (Ribbon)
TRAINING/PERSONNEL: TRADOC instructors and New Equipment Training Teams (NETT) will be trained by the contractor. Initial training will be by NETT for Combat Engineer organizations issued the M9. Institutional training at U.S. Army Engineer Center at Fort Leonard Wood will provide training for the operator (MOS 12F) and maintainer (MOS 62B). Operator proficiency will be maintained by Training Extension Course tapes and extension training materials.

克里斯Chris

M9比例圖








M9圖集

克里斯Chris

M9裝甲戰鬥推土機





　　M9裝甲戰鬥推土車最初是由PCF防務工業公司研製的，並由該公司生產了首批l5輛車。經過一番競爭，現在的聯合防務公司地面系統分部成為了該車的主生產商。M9裝甲戰鬥推土車車體前部裝有刮土鬥，而駕駛員和動力裝置位於車後部。該車由一人操作。M9裝甲戰鬥推土車是完全兩棲的，可通過其履帶划水，在水上的推進速度為4.8千米/小時。另外，M9裝甲戰鬥推土車安裝有一個絞盤，採用1根鋼繩時，牽引力為25.9噸，還安裝了三防裝置和夜視裝置。戰鬥全重16.3噸，最大速度48.3千米/小時，最大行程322千米。

克里斯Chris

M9裝甲戰鬥工程車

[概述]:M9裝甲戰鬥工程車由美國機動裝備研究與發展中心於1958年開始研製，價值2.1億美元.1975年 1月生產出樣機，1976年 8月美軍試驗與鑒定司令部完成試驗鑒定工作，1977年 2月批准定型，1982年初該項目交給陸軍坦克與機動車輛司令部管理，同年由太平洋汽車與鑄造公司生產15台，以後改由 BMY公司生產。M9機械性能先進,能完成保障部隊機動(築路、填平彈坑、清除障礙物，修建突擊機場等）、反機動（構築障礙物、實施破壞作業等）和生存力（構築陣地工程和指揮工事等）多項任務。

其特點：（ 1）高機動，能高速越野行駛、在內河水中浮游，可空運；（ 2）多能完成推、鏟、平、運、牽引等作業，同時載運工兵班及其武器裝備，能當自卸車用；（ 3）高效，採用壓載的辦法解決機動與作業效率之間的矛盾；（ 4）防好，有鋁合金裝甲板，有三防、煙幕施放、夜視能力並可與特遣部隊通訊。美國海軍陸戰隊決定採購M9以取代目前遂行戰鬥挖掘任務所用的民用機械，將在1993～1995財政年度採購，在1995～1997財政年度交貨。

克里斯Chris

[裝備狀況]:裝備美國陸軍,裝備到第86師戰鬥工兵部隊的工兵排(每排1台)

     該車長6。17米，寬2。79米，高2。66米，最高行駛速度48千米/小時，水上浮游速度4。8千米/小時，涉水深1。83米，爬坡能力31度（縱坡）和19度（橫坡），越壕寬1。57米，克服垂直障礙0。45米，燃料儲備行駛370千米，發動機功率220千瓦。作業裝置有推土鏟、鏟斗、刮土斗、牽引桿等。

    該車已裝備美軍師和獨立旅的每個戰鬥工兵排每排2部，其它每個戰鬥工兵排每排1部，空降。師每連1部。

    該車火力較弱，需其它兵種支援。

克里斯Chris

[其它]:產 品 名 稱：M9裝甲戰鬥工程車

產品原名稱：M9 Armored Combat Earthmover (ACE)

研 制 單 位：US/Army Tank-Automotive Command

單 位 地 址：Warren,Michigan 45397-5000,USA.

開始研製時間：1958年

生 產 廠 商：US/BMY-Combat Systems Divison of HARSCO Corporation

廠 商 地 址：PO Box 1512,York, Pennsylvania 17405,USA.

[參考資料]: 1. 《J'S-ML》，1990-91年，20頁

2. 《Marine Corps Gazette》，1989年，(2)，21頁