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Multi-stage hydromechanical transmission

A kind of transmission device and planetary transmission technology, which is applied in the field of hydromechanical transmission device of vehicle or machine power system, and can solve the problems of lower reliability of synchronizer and increase of transmission device cost, etc.

Active Publication Date: 2017-06-27
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the relative complexity of the synchronizers reduces reliability and increases the cost of the transmission

Method used

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  • Multi-stage hydromechanical transmission
  • Multi-stage hydromechanical transmission
  • Multi-stage hydromechanical transmission

Examples

Experimental program
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Embodiment Construction

[0020] The present invention relates to hydromechanical transmissions, and more particularly to hydromechanical transmissions including a plurality of hydraulic clutches capable of providing synchronous shifts without the use of synchronizers. Although the embodiments disclosed herein are described with respect to earth moving machines, they are applicable to other applications, such as automotive applications, light, medium and heavy duty trucks, and the like.

[0021] figure 1 An outline of a wheel loader is shown as an example of a vehicle or machine 100 . figure 2 is a schematic diagram of the powertrain 200 of the vehicle 100 . Referring to these figures, a vehicle 100 includes an engine frame portion 102 connected to a non-engine frame portion 104 by an articulation joint 106 . Each of the engine frame portion 102 and the non-engine frame portion 104 includes a respective shaft 202 connected to a set of wheels 108 . The engine frame section 102 includes an engine 110...

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Abstract

The continuously variable transmission (1000) includes two sets of planetary gears (1020) with two outputs. The transmission (310) drives the ring gear (340) of the second planetary gear set (332), and the transmission (1000) input shaft (302) is driven by the engine (110), which also drives the transmission (310) and planetary Transmission input. The second and third output shafts (302) are connected to the transmission (1000) output shaft (204). A first clutch (360) is connected to the first output shaft (1002) and a second clutch (362) is connected to the second planetary output and engages the first drive gear (424). The third clutch (364) is connected to the first output shaft (1002) and releasably engages the first drive gear (424), and the fourth clutch (366) is connected to the first drive gear (424) and releasably engages the second drive gear (424). The output shaft (1008), and the fifth clutch (368) are connected to the first drive gear (424) and releasably engage the third output shaft (1018).

Description

technical field [0001] The present invention relates generally to continuously variable transmissions and, more particularly, to hydromechanical transmissions for vehicle or machine powertrains. Background technique [0002] Multi-stage hydromechanical transmissions are known for providing smooth transitions between various gear ratios in machines and other vehicles. Shifting in a typical hydromechanical transmission is accomplished through the use of two or more clutches capable of synchronously disengaging one gear ratio and simultaneously engaging another. Synchronization of clutch speeds can be achieved through the use of synchronizing assemblies implemented in various forms. One known structure for a synchronizing assembly includes a gear connected to a clutch configured to selectively engage two or more rotating elements in a transmission such that the rotating element associated with the oncoming gear and the The rotating elements associated with the engaged gears r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H47/04F16H9/26F16H61/40
CPCE02F9/202E02F9/2253F16H47/04F16H61/0246F16H2037/0886F16H2200/2007F16H2312/08
Inventor J·M·塞波尔德G·P·卡尔维特R·E·布拉克M·G·克罗宁
Owner CATERPILLAR INC