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Single mode, compound-split transmission with dual mechanical paths and fixed reduction ratio

A mechanical transmission, path technology, applied in mechanical equipment, elements with teeth, the arrangement of multiple different prime movers of general power units, etc., can solve problems such as loss of available energy

Inactive Publication Date: 2007-11-14
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Series electric drives suffer from the weight and cost of an electric motor sufficient to convert all of the engine power from mechanical to electrical in the generator and from electrical to mechanical in the drive motor, and the amount of energy available in these conversions loss
[0015] Dual-mode, compound-split systems typically achieve a wide ratio range, but require clutch and mode shifting with associated spin losses and accessory power requirements

Method used

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  • Single mode, compound-split transmission with dual mechanical paths and fixed reduction ratio
  • Single mode, compound-split transmission with dual mechanical paths and fixed reduction ratio
  • Single mode, compound-split transmission with dual mechanical paths and fixed reduction ratio

Examples

Experimental program
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no. 1 example

[0042] The variator 10 shown in stick diagram form in FIG. 1 can be realized by a number of alternative design embodiments, including the embodiments shown in stick diagrams in FIGS. 2 and 3, which are of longitudinal design. FIG. 2 shows a transmission 100 designed to receive at least a portion of the drive power from the engine 11 . The engine 11 has an output shaft serving as the input member 12 of the transmission 100 . The output member 14 of the transmission 100 is coupled with a final drive unit (not shown) to deliver drive power to the vehicle wheels. Transmission 100 includes 3 simple planetary gear sets. The first planetary gear set 120 includes a sun gear member 122 (designated S1), a ring gear member 124 (designated R1), and a carrier member 127 that rotatably supports a number of planet gears 129 (designated P1), which Gear 129 is in meshing engagement with the sun gear member 122 and the ring gear member 124 .

[0043] The transmission 100 also includes a seco...

no. 2 example

[0051] The stick diagram of FIG. 3 embodying the stick diagram 16 of FIG. 1 is similar to the stick diagram of FIG. 2 except that the reduction gear connection is changed to obtain a higher reduction ratio. FIG. 3 shows a transmission 200 designed to receive at least a portion of the drive power from the engine 11 . The engine 11 has an output shaft serving as the input member 12 of the transmission 200 . The output member 14 of the transmission 200 is coupled with a final drive unit (not shown) to deliver drive power to the vehicle wheels. Transmission 200 includes 3 simple planetary gear sets. The first planetary gear set 220 includes a sun gear member 222 (designated S1 ), a ring gear member 224 (designated R1 ), and a carrier member 227 that rotatably supports a number of planet gears 229 (designated P1 ), which Gear 229 is in meshing engagement with the sun gear member 222 and the ring gear member 224 .

[0052] The transmission 200 also includes a second planetary gea...

no. 3 example

[0060] FIG. 4 is another embodiment of an electromechanical transmission 300 within the scope of the present invention. The transmission 300 is of transverse design using a transfer shaft with transfer gears including reduction gears to provide a reduction ratio in the second mechanical power path. Thus, the third lever 40 of FIG. 1 is replaced by a transmission shaft and a transmission gear described below.

[0061] The transmission 300 is designed to receive at least a portion of driving power from the engine 11 . The engine 11 has an output shaft serving as the input member 12 of the transmission 300 . The output member 14 of the transmission 300 is coupled with a final drive unit (not shown) to deliver drive power to the vehicle wheels. Transmission 300 includes 2 simple planetary gear sets. The first planetary gear set 320 includes a sun gear member 322 (designated S1), a ring gear member 324 (designated R1), and a carrier member 327 that rotatably supports a number of...

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Abstract

A single mode, compound-split transmission is provided having two mechanical power paths. One mechanical path is primarily active at low speed ratios with the other path being primarily active in high speed ratios. A reduction ratio is available in the path employed for high speed ratios, reducing electrical path power requirements. Additionally, the reduction ratio, allows both of two motor / generators to be of a relatively low torque design.

Description

technical field [0001] The present invention relates to a compound-split transmission having dual mechanical paths, one of which provides a reduction ratio. Background technique [0002] Internal combustion engines, especially reciprocating piston internal combustion engines, drive most vehicles today. Such engines are relatively efficient, compact, lightweight, and inexpensive mechanisms by which highly concentrated energy in the form of fuel is converted into usable mechanical power. Typically, the internal combustion engine is started from cold by a small electric motor and relatively small electrical storage battery, and then quickly placed under load from the drive and accessory devices. The engine is also capable of operating over a wide range of speeds and loads, typically averaging at about one-fifth of its maximum power output. [0003] A vehicle transmission typically transfers mechanical power from the engine to other components of the driveline, such as fixed f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H3/72F16H61/32
CPCF16H2037/102Y02T10/6239B60W10/115F16H3/727B60K1/02B60W10/02B60K6/547B60W10/08B60K6/40B60K6/365B60K6/445B60W20/00Y02T10/62B60W10/06B60W20/30
Inventor B·M·康伦
Owner GM GLOBAL TECH OPERATIONS LLC
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