Continuous speed-change branched gear, in particular for motor v

Details Continuous speed-change branched gear, in particular for motor v Continuous speed-change branched gear, in particular for motor v

1988-02-09

1990-12-11

Diehl, Dwight G.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Pump and motor in series with planetary gearing

475 76, F16H 4704

Patent

active

049766660

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a continuously variable split-path transmission, particularly for motor vehicles, having at least three forward operating ranges and consisting of a stepless converter comprised of a primary unit and a secondary unit, a four-shaft summation planetary gear train for adding up the power, which is split at the input of the transmission into two multiple power transmission paths, and a downstream second planetary gear unit, whereby the input shaft is in permanent driving connection with the primary unit and with a first shaft of the summation planetary gear train, and the secondary unit is also permanently connected to a second shaft of the summation planetary gear train.
Continuously variable transmissions of this type are already known through DE-PS No. 27 16 960, DE-OS No. 27 58 659, DE-AS No. 24 15 002, DE-OS No. 31 25 123. These transmission systems, however, each have only two forward operating ranges, with the disadvantage that relatively large hydrostatic units are required, in contrast to the subject of the invention. Through EP No. 0 105 515, another similar transmission model with a flexible drive mechanism is known which, similar to the aforementioned transmission models, have only two forward operating ranges despite the relatively great technical efforts. Accordingly, the stepless converter of this transmission model is heavily loaded, which necessitates correspondingly large dimensions, i.e., the total conversion range of the transmission is small when compared with the mechanism that is the subject of the invention.
The object of the invention is to provide a continuously variable split-path transmission system which possesses at least three forward drive systems and facilitates the use of small, continuously variable converting mechanisms and permits vehicle-friendly, compact constructions for different applications.
This object is solved through the provision of a transmission wherein the output shafts of the summation planetary gear are each selectively connectable with the second planetary gear unit and one shaft of the latter is in permanent driving connection with the transmission output shaft.
The invention will be explained with reference to specific embodiments in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic representation of a first specific embodiment with a hydrostatic converter, four forward operating ranges and one reverse drive range.
FIG. 2 is a schematic representation of a second specific embodiment with a flexible drive mechanism, four forward operating ranges and one reverse drive range.
FIG. 3 is a schematic representation of another specific embodiment with a hydrostatic converter, four forward operating ranges and two reverse drive ranges.
FIG. 4 is a schematic representation of a fourth specific embodiment with a hydrostatic converter, four forward operating ranges and one reverse drive range.
FIG. 5 is a schematic representation of a fifth specific embodiment with a hydrostatic converter, four forward operating ranges and one reverse drive range.
FIG. 6 is a schematic representation of a specific embodiment of the summation planetary gear train.
FIG. 7 is a schematic representation of a another specific embodiment of the summation planetary gear train.
FIG. 8 is a schematic representation of a another specific embodiment with a hydrostatic drive positioned in parallel relative to a summation planetary gear train with range clutches and a second planetary gear unit.
FIG. 9 is a schematic representation of a specific embodiment with a planetary gear unit positioned in parallel relative to the range clutches and with a differential axle, e.g., for a passenger vehicle with transverse drive.
FIG. 10 is a schematic representation of a specific embodiment of the transmission with the hydrostatic drive unit displaced laterally in parallel relative to other components.
The split-path transmission in accordance with the invention consists of a stepless converter 40; 140 arranged at the input, a four-shaft summation planetary

REFERENCES:
patent: 3969957 (1976-07-01), DeLalio
patent: 4114475 (1978-09-01), Orshansky, Jr. et al.
patent: 4164155 (1979-08-01), Reed
patent: 4164156 (1979-08-01), Reed
patent: 4291592 (1981-09-01), Meyerle et al.
patent: 4373359 (1983-02-01), Ehrlinger et al.
patent: 4382392 (1983-05-01), Meyerle et al.
patent: 4434681 (1984-03-01), Friedrich et al.
patent: 4799401 (1989-01-01), Reed

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