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Borg-Warner 35 transmission
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Borg-Warner 35 transmission : ウィキペディア英語版
Borg-Warner 35 transmission
The Borg-Warner 35 transmission (BW-35) is an automatic transmission produced by the BorgWarner company. This article also applies to variations—the M-36 and M-37. When this article refers to "M-3x" it refers to all models. When model number specific it will use the exact model number.
The "3" in the number refers to the specific series of transmission. The M-3x, 4x, 5x and 6x transmissions are all aluminum cased transmissions that are related to the M-35 (the first of the aluminum Borg-Warner automatics). In this case the rising series number is relative to transmission strength—a larger number will withstand more power than a smaller number. This isn't, however, a general rule with Borg-Warner automatics. The earlier M-8 and M-1x cast iron case transmissions are much stronger than the aluminum models, although the M-6x may handle as much power as the M-1x series. The second number refers to a specific variation. This usually indicates a higher torque load capability, but may refer to other variations that may not increase torque rating.
The M-3x has three forward and one reverse gears. The selector lever varies depending on years and car models the transmission is used in. All models follow a quadrant which has six stations. Early models have two drive positions marked with a "2" and a "1" (P-R-N-D2-D1-L; Park, Reverse, Neutral, D2, D1 and Lock). These models start off in Second gear when in the D2 position. This is useful for economy in relatively flat terrain and for starting on slippery surfaces (wet mud, snow, ice, etc.). When placed in the D1 position the transmission shifts through all three forward gears. In "Lock" the transmission can be locked to prevent upward gear changes and will provide maximum engine braking in 1st gear and moderate engine braking in 2nd gear. By selecting L from starionary, or before an upward gear change into 2nd gear, the transmission will become locked in 1st gear. By selecting L from D2 or D1 while in 2nd gear, the transmission will become locked in 2nd gear or from D2 or D1 when cruising below 55 m.p.h (88 k.p.h.) will effect an immediate downward change and lock in 2nd gear. In both these instances, the transmission will automatically change down into 1st gear when the car speed drops below 5 m.p.h. (8 k.p.h.). Should 1st gear be required earlier, reduce the car speed to below 30 m.p.h. (48 k.p.h.) and effect a "kick-down" gear change. Many people assume they have a two speed transmission because they expect the first Drive position (D2) to shift through all three gears as all automatic transmissions have done since 1968. Some vehicles had the same system without the D1 and D2, instead just having D, and only 5 stations on the quadrant.
Starting in 1965 the M-3x was made with the now common P-R-N-D-2-1 shift arrangement (Park, Reverse, Neutral, Drive, Second gear, First gear). AMC called this "Shift-Command" to differentiate it from the D2/D1 models, since either could be ordered in an AMC/Rambler automobile from 1965-1967.
The M-36 was introduced in 1965. It is essentially the same as the M-35 except that it has provisions for an external transmission oil cooler. The M-35 was air cooled by the torque converter with a fan on it. The M-35 case has provisions to be drilled for an external cooler, but no U.S. models used an external cooler and do not have the internal provisions to mount one. There may be European models that were equipped with external coolers. An external oil cooler made it suitable for heavier vehicles and/or towing heavier loads. AMC used the M-36 behind the 232 six in their Ambassador starting in 1965.
The M-37 is first mentioned in the 1967 AMC Technical Service Manual (TSM). It was used behind the 232 in larger vehicles. It has a higher torque rating than the M-35 and M-36. By 1967 the M-36 was relegated to the 199 six, the 232 received the stronger M-37 in all AMC vehicles.
European models may differ.
〔1962-1971 AMC Technical Service Manuals〕
==Description==
When the transmission of the motionless vehicle is placed in Drive, the transmission allows the vehicle to move off in first gear, then will change to second and then to third gear based on increase in road speed. The BW-35 will downshift from third to second and from second to first, also based on load. The transmission is equipped to produce kickdown and will upshift after kickdown if accelerator pressure is released following a kickdown.
As is common in automatic transmissions of its generation, power brought to the transmission via the torque converter drives hydraulic fluid. As the gears move faster or slower, pressure of the fluid increases or decreases in the case. Mechanical switching of gears is triggered by the increase or decrease of pressure. There are no electronic sensors or switches as found in modern transmissions. There is a Throttle Valve in the control valve body that is connected to the throttle linkage via a cable. This regulates internal pressure by throttle position. A secondary function of this cable is to down-shift ("kick down") to a lower gear when the Throttle Valve is in the full stop position (throttle pedal is fully depressed) and road speed is below a set point regulated by a mechanical governor on the output shaft.
The Borg Warner 35 automatic transmission comprises a torque converter and a fully automatic 3-speed hydraulically controlled epicyclic gear box. The automatic transmission provides three forward and one reverse gear ratio.
The hydraulic control system consists of a valve arrangement and an engine driven pump. The automatic transmission contains a planetary gear set consisting of two sun gears, two sets of three planet pinions contained within a planetary carrier and ring gear. Various speed ratios are obtained by holding or clutching various combinations of elements of the planetary train. This is performed by two bands, two multi-disc clutches and a one-way clutch.
The Borg Warner 35 was designed for use with Type F Automatic Transmission Fluid (ATF), which is far less common today than the Mercon/Dexron type.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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