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Parking brakes

A parking brake and parking technology, applied in the direction of brake types, drum brakes, brake actuators, etc., can solve problems such as excessive travel of the hand brake lever, brake drum noise, etc.

Active Publication Date: 2006-11-29
AUTOMOTIVE PRODS ITALA (SV) SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems can arise in properly adjusting the length / cable tension of the connecting cables when the vehicle is assembled on the production line
This can cause vehicles leaving the production line to have excess travel on the handbrake lever before the parking brake is properly applied
[0005] If the brake shoe mounted on the parking lever is incorrectly retracted to its retracted position when the parking brake is released, causing the brake to be partially applied and dragging on the associated brake drum causes unnecessary noise and may Also generates unnecessary heat, which can also create problems

Method used

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Examples

Experimental program
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Embodiment Construction

[0027] refer to figure 1 , which shows a drum brake in which two brake shoes 11 and 12 are mounted on a base plate 13 for operation by a hydraulic wheel cylinder 14 to engage a surrounding brake drum (not shown) in known manner Provides service brake function. A parking brake function is also provided in which the parking lever 15 pivots clockwise about a pin 21 carried by the shoe 12 (as from figure 1 Viewed in ) the two shoes are applied to the brake drum via a strut 16 extending between the two pins. A traction spring 16 a acts between the shoes 11 and 12 and the effective length of the strut 16 is adjusted by a parking brake adjustment mechanism, designated generally at 17 and embedded in the strut 16 . An example of a suitable regulator mechanism is fully described in the applicant's European Patent No. 0388057.

[0028] The retraction spring 16b acts between the parking lever 15 and the web 12a of the shoe 12 . The spring has end hooks 16c and 16d which engage notche...

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PUM

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Abstract

A parking brake is described which has a backplate (13), first and second brake shoe portions (11,12) mounted on the backplate, a drum encircling the brake shoe portions, a parking lever (15) pivoted (21) adjacent one end on one (12) of the brake shoe portions, and a strut (17) extending between a first abutment on the parking lever (15) and a second abutment on the other (11) of the brake shoe portions. Operation of a driver operated handbrake lever pivots the parking lever relative to said one brake shoe portion (12)via a connecting cable (19) so that the parking lever moves from a retracted position to an operative position thus moving the strut (17) which in turn moves the other brake shoe portion (11) away from said one brake shoe portion (12) to bring the shoe portions into contact with the drum thus apply the parking brake. The backplate (13) includes a viewing opening (40) , and the parking lever (15) and said one brake shoe portion (12) include datum surfaces (12c,22a) visible through the viewing opening from which the position of the parking lever (15) relative to said one brake shoe portion (12) can be assessed, thus enabling verification that the cable (19) is applying force to the parking lever (15) when the parking brake is released and is therefore tensioned to a predetermined level.

Description

technical field [0001] The present invention relates to parking brakes, and in particular to parking brakes of the "described type" hereinafter comprising a base plate, first and second shoe parts mounted on the base plate, a a brake drum, a park lever pivoting on one shoe portion adjacent one end, and a strut extending between a first mount on the park lever and a second mount on the other shoe portion , so the hand brake cable partially pivots the parking lever relative to said one shoe, whereby the parking lever moves from the retracted position to the operated position, thereby moving the strut, which in turn causes the other brake shoe A portion is moved away from the one shoe portion so that the shoe portion contacts the brake drum, thereby applying the parking brake. Background technique [0002] The shoe portion may be provided by separate shoes as in a normal double shoe brake or by the opposite ends of a single generally U-shaped shoe of the form disclosed eg in E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D66/02F16D65/14F16D66/00
CPCF16D2125/62F16D2051/003F16D65/22F16D2121/14F16D66/00F16D66/02
Inventor L·特斯拓雷
Owner AUTOMOTIVE PRODS ITALA (SV) SPA