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Hydraulic chain tensioner assembly

A chain tensioning device, hydraulic technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve problems such as loose chain

Inactive Publication Date: 2009-10-14
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over time, the chain may loosen due to repeated loading and unloading cycles during torque reversal

Method used

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  • Hydraulic chain tensioner assembly
  • Hydraulic chain tensioner assembly
  • Hydraulic chain tensioner assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Referring to the drawings, wherein like reference numerals refer to like parts, figure 1 An engine 10 is shown having a hydraulic chain tensioner assembly 12 tensioning a balancer drive chain 14 . It should be noted that although the hydraulic chain tensioner assembly 12 is used in figure 1 However, those of ordinary skill in the art will appreciate that such a hydraulic chain tensioner assembly 12 could alternatively be applied to a tensioning valve train drive. Crank sprocket 16 powered by engine 10 and rotating at engine speed drives balancer chain 14 which rotates countershaft sprockets 18A and 18B to drive a balance shaft connected thereto (balance shaft not shown). out). The arrangement of the crank sprocket 16 and balance sprockets 18A, 18B requires encapsulation of the hydraulic chain tensioner assembly 12 as shown, which means that it contacts the chain 14 in a short span. Tensioning the chain 14 over such a short span increases the noise caused by the inter...

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PUM

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Abstract

The hydraulic chain tensioner assembly includes a sliding plunger received within an opening in the tensioner body so as to define a controlled clearance and a substantially fluid-tight chamber. The pressure in the supply reservoir, which is in fluid communication with the fluid-tight chamber, is controlled to a lower level by the size of the inlet and outlet holes in communication with the supply reservoir. Thus, the force of the shoe on the chain connected to the plunger is a function of the stiffness of the main spring biasing the plunger outward and is substantially independent of the fluid source supplying fluid to the reservoir. A method of making a hydraulic chain tensioner assembly is also provided.

Description

technical field [0001] The present invention relates to a hydraulic chain tensioner assembly comprising a fluid tight chamber connected to a pressure controlled supply reservoir. Background technique [0002] Chain drives emerged as work aids within modern automobile engines. For example, chain drives have been used to drive complex valve trains, balance shafts, oil pumps, high pressure fuel injection pumps and water pumps. With the increased packaging complexity and its impact on chain drive layout and design, dedicated tensioning devices have become a practical need to ensure the overall functional performance of the chain drive. Over time, the chain may become loose due to repeated loading and unloading cycles during torque reversal. Hydraulic chain tensioner assemblies must balance applying sufficient force to tension slack chain to maintain chain function while minimizing chain noise. The noise caused by high loads may be referred to as "rattle" and "cough" and is pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H7/08
CPCF16H2007/0859F16H2007/0812F16H2007/0806F16H7/0848
Inventor J·M·比德莫尔
Owner GM GLOBAL TECH OPERATIONS LLC
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