Ratcheting tensioner with a sliding and pivoting pawl

A technology of tensioner and pawl, applied in the direction of belt/chain/gear, transmission device, mechanical equipment, etc.

Inactive Publication Date: 2009-05-20
BORGWARNER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the problems with the tensioner of US Patent No. 4,874,352 is that the piston 3 rotates and ratchets with the rack 13 along the outer circumference of the piston 3 until all the teeth on the pawl 12 are no longer engaged with the rack 13 of the piston

Method used

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  • Ratcheting tensioner with a sliding and pivoting pawl
  • Ratcheting tensioner with a sliding and pivoting pawl
  • Ratcheting tensioner with a sliding and pivoting pawl

Examples

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Embodiment Construction

[0029] Figures 5 to 13 shows the tensioner of the present invention. The tensioner includes a housing 202 having a cutout 228 for receiving a rotating, sliding pawl 206, and a bore 216 for slidingly receiving a hollow piston 204 that creates a fluid flow with the bore 216. Room 219. A passage 224 inside the housing 202 connects a source of pressurized fluid to the fluid chamber 219 . A check valve 221 comprising a flow ball 220 and a seat 222 only allows fluid to flow into the fluid chamber 219 . Piston 204 is biased by spring 218 in a protruding direction from housing 202 towards a chain or belt (not shown). The piston 204 includes a series of slots 204b around or through at least a portion of the outer circumference of the piston 204 for ratcheting engagement with a rotationally sliding pawl 206 . At least one of these grooves acts as a stop 204d to help prevent the piston 204 from being ejected from the housing 202 .

[0030] The rotating, sliding pawl 206 is rotatabl...

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PUM

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Abstract

A tensioner with a piston is slidably received with a bore (216) of the housing and has a plurality of grooves (204b) formed on its outer circumference. A piston spring (226) biases the piston (204) in an outward direction from the bore. A pawl (206) is received by a cutout in the housing and is pivotally and slidably attached to the housing by a pin (208). The pawl has a first protruding shoulder (206a), a second shoulder (206b), a teeth portion (206c), and a hole (211) defined between the first protruding shoulder and the second shoulder. The pawl is biased toward the grooves formed on the outer circumference of the piston by a spring.

Description

technical field [0001] The present invention relates to the field of tensioners. More specifically, the present invention relates to tensioners with sliding and pivoting pawls. Background technique [0002] In chain and belt tensioners, the pistons are pushed by a spring or spring-plus-hydraulic pressure from their housings. A check valve is added to the tensioner between a source of pressurized fluid and a fluid chamber formed between the housing and the piston to prevent backflow of hydraulic fluid from the fluid chamber. The piston-to-bore gap leak rate allows retraction of the piston when replenishment fluid subsides or ceases. As the leakage rate increases, the restriction on piston retraction becomes smaller and as the leakage rate decreases, the restriction on piston retraction increases. Retraction of the plunger occurs when there is a sudden change in chain load or there is a loss of fluid pressure and if the retraction of the plunger is excessive, chain runaway ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H7/08
CPCF16H2007/0853F16H2007/0806F16H7/0848F16H7/08
Inventor G·L·马克利
Owner BORGWARNER INC
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