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Hydraulic tensioner

A tensioning device and hydraulic technology, applied in the direction of transmission, belt/chain/gear, machine/engine, etc., can solve the problems of high cost and achieve the effect of reducing manufacturing cost

Inactive Publication Date: 2009-08-26
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, due to the processing direction of the outflow opening it can only be produced cost-intensively

Method used

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  • Hydraulic tensioner

Examples

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Embodiment Construction

[0026] FIG. 1 shows a longitudinal section through a hydraulic tensioning device 1 with a protective housing 2 . The protective casing 2 is connected to the engine casing, not shown. It has a pressure oil port 3, and lubricating oil from the pressure oil port 3 reaches the valve 6 through the annular space 4 and the transverse groove 5. The valve 6 is located at the bottom 10 of a box 11 which is arranged in the protective case 2 with a sealing clearance. The valve 6 includes a valve ball 7 , a valve seat 21 , a valve spring 8 and a valve sleeve 9 .

[0027] The housing 11 has a blind bore 12 into which a tensioning piston 13 is introduced with sealing play. The tensioning piston 13 contains a blind bore 14 . The blind holes 12 , 14 surround a high-pressure chamber 15 in which a compression spring 16 is arranged. The compression spring 16 acts via the tensioning piston 13 on a not shown tensioning and pulling mechanism. The stroke of the tensioning piston 13 is limited by...

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Abstract

The invention relates to a hydraulic tensioning device for a traction mechanism, especially a hydraulic tensioning device for a traction mechanism of an internal combustion engine. The valve is arranged in the axial middle bore and opens outwards, the middle bore contains the opening and is fastened by a pot-shaped cover, which is supported on the piston bottom and maintains a friction-closed connection with the piston bottom. The advantage of the hydraulic tensioning device is that it can be manufactured cheaply and is easy to handle, characterized in that the pot-shaped cover is formed as a thin-walled sleeve (27) with a sleeve bottom (32) and is connected to the narrowing of the piston bottom (19) The peripheries of the ends (31) of the tubes are preferably connected by a press fit, and the openings (34) are axially disposed within the bottom (32) of the sleeve.

Description

technical field [0001] The invention relates to a hydraulic tensioning device for a traction mechanism, which includes a tensioning piston, and a pressure limiting valve is arranged in the bottom of the tensioning piston. The pressure limiting valve is arranged in the axial middle hole and opens outwards. The bore contains an opening and is snapped by a pot that rests on and maintains a frictionally closed connection with the piston bottom. Background technique [0002] Traction mechanisms such as chain drives or belt drives require optimized initial stress for maximum efficiency and lifetime. Since the length of the traction mechanism changes due to heating and wear, its prestress must be continuously readjusted. Suitable for this purpose is undoubtedly the hydraulic tensioning device. [0003] Such a hydraulic tensioning device has a tensioning piston which can be inserted, for example, into a blind bore of the housing and closes the pressure chamber. A compression spri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H7/08F02B67/06
CPCF16H2007/0859F16H2007/0814F16H7/0836F16H2007/0812F16H2007/0806F16H7/08F16H7/12
Inventor 伯特·克鲁恩莱因哈德·科吉
Owner SCHAEFFLER TECH AG & CO KG
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