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Piston for a hydraulic mechanism tensioning device, with a venting device

A technology of traction mechanism and tensioning device, which is applied to the transmission device, transmission device parts, mechanical equipment, etc., and can solve the problems of unreliable exhaust.

Active Publication Date: 2015-03-25
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, there is a problem with the position of the exhaust duct or the exhaust opening in the cover element, since the cover element is designed to rest on the tensioning rail, it can happen that the tension rail is briefly in the contact point cover the exhaust opening so that it cannot be reliably exhausted

Method used

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  • Piston for a hydraulic mechanism tensioning device, with a venting device
  • Piston for a hydraulic mechanism tensioning device, with a venting device

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Embodiment Construction

[0011] figure 1 Shows a cross-section of a piston according to the invention, which is provided for use in a hydraulic traction mechanism tensioning device. The piston 1 has a cylinder-shaped housing 2 with a hollow chamber 3 for containing oil. The hollow chamber 3 is configured as a high-pressure chamber, and oil pressure is established in the high-pressure chamber. Since air has different compression characteristics from oil, it is desirable to derive the air contained in the hollow chamber. For this reason, a through hole is arranged in the top 11 of the housing 2 through which air can leak out of the hollow chamber 3 or high pressure chamber of the piston 1. The piston 1 is usually made of steel or aluminum and rests on a tension rail, which is mostly made of synthetic material or another lightweight material. During operation, the piston 1 presses the tension rail, so that in the contact area, due to the harder piston material, wear on the tension rail is caused. It i...

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PUM

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Abstract

Piston (1) for a hydraulic mechanism tensioning device of a flexible drive in an internal combustion engine comprising a pot-like housing (2) having a cavity (3) for receiving oil and one in the bottom (11) of the housing (2) arranged through bore (5), and a from outside the housing (2) on the base (11) attachable cap (4), on which bears the piston (1) to a clamping rail of the flexible drive, wherein the cap (4) on its bottom (11) of the housing (2) directed towards the inner surface (12) has at least one groove-like depression (9). According to the utility model, continuous and reliable air discharging can be ensured.

Description

Technical field [0001] A piston of a hydraulic traction mechanism tensioning device used for a traction mechanism transmission device in an internal combustion engine. The piston has a cylinder-shaped housing and a cap that can be inserted on the top from the outside of the housing, and the housing has a hollow chamber for containing oil and a top. A through hole is arranged in the top of the housing. The piston can be supported on the tension rail of the traction mechanism transmission device by means of the cap. Background technique [0002] Pistons according to the aforementioned category are known from the patent document EP2013515B1. The document shows a tensioning device with a piston. The piston has a groove on its end side and a covering element. The covering element is fitted into the groove, so that one third of the covering element extends beyond the edge of the piston. The cap rests on the end face like that. The end surface of the piston and the covering element ...

Claims

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Application Information

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IPC IPC(8): F16H7/08
CPCF16H7/0848F16H2007/0806F16H2007/0817F16H7/08F16H57/027
Inventor 多米尼克·霍夫曼
Owner SCHAEFFLER TECH AG & CO KG
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