Parking lock pre-selection system

A parking lock and parking technology, which is applied in the field of parking lock systems, can solve problems such as misalignment of telescopic links, easy adhesion or other interference, etc., and achieves the effect of being difficult to influence and simplifying the structure.

Active Publication Date: 2017-08-29
CNH IND MASCH (HARBIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is problematic when applied in the environment of agricultural machinery with external pollutants and complex changing conditions
Telescoping link clearances are critical and prone to sticking or other interference
Also, when the work machine is on a hill (in which case the weight of the work machine translates into a force on the link), the telescoping links can misalign

Method used

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  • Parking lock pre-selection system
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Examples

Experimental program
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Embodiment Construction

[0018] Referring to FIG. 1 , a powertrain 10 is shown, partially shown in schematic form. Powertrain 10 is typically used in a work machine (not shown) to provide forward motion for the work machine and also to connect the output of the work machine power unit to agricultural processing equipment. The powertrain 10 may include transmissions, differentials, clutches, and other mechanical devices to match the RPM of the power unit to a desired speed or torque output. The powertrain 10 includes an output shaft 12 supported at 14 within a housing 16, only partially shown. Shaft 12 may have a gear 18 for engagement with other components of drive train 10 . Shaft 12 has a plurality of teeth 20 extending radially outward at selected locations around the periphery of the shaft. The pawl 22 is mounted on a rocker arm 24 which is pivotally mounted at 26 and is displaceable to position the pawl 22 such that the pawl interferes with the shaft 12 by means of the teeth 20 and locks the sh...

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PUM

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Abstract

A parking lock pre-selection mechanism for a work machine (10) in which a pawl (22) is engageable with teeth (20) on a power train output shaft (12) to lock it in place. An operator lever (48) is used to preselect the parking lock position (50). The mechanism includes first and second pivotally interconnected links (54, 56), urged by a spring (74) to a maximum length set by a stop (72). The spring (74) causes the pawl (22) to be urged into place when the teeth (20) and pawl (22) are in proper alignment.

Description

technical field [0001] This invention relates to work machine powertrains, and more particularly to parking lock systems for such powertrains. Background technique [0002] In the field of work machines, the power train plays an important role in propelling the work machine at the proper speed and providing sufficient torque for the movement of the work machine and for additional power needs such as agricultural handling. An important feature of a work machine power train is the presence of a park lock which positively locks the power train and thus the work machine in place. Typically, this is accomplished by positively locking the work machine in place using teeth on one of the powertrain output shafts and a park pawl that is movable into engagement with the teeth. US 6,250,433 discloses a form-fitting parking brake in which the brake / lock pin is preferably biased towards the extended position by a spring acting directly on the pin. [0003] The park lock pawl is equippe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T1/00F16D63/00
CPCB60T1/005F16D63/006F16H63/34F16H51/00F16H63/3433F16D2121/14
Inventor E·孔蒂
Owner CNH IND MASCH (HARBIN) CO LTD
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