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Tensioner

A tensioner, compact technology, applied in the direction of belt/chain/gear, mechanical equipment, transmission, etc., can solve problems such as floating, tilting of transmission shaft, and inability to ensure stable movement

Inactive Publication Date: 2007-01-17
NHK SPRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the tensioner described in Japanese Patent Application Laid-Open No. 2003-184968, when the engine rotates at a high speed and high vibration is input, or when lateral vibration occurs, the propeller shaft will violently fluctuate in the vertical direction to tilt or float. There is a problem that stable operation cannot be ensured

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] figure 1 A tensioner A1 according to Embodiment 1 of the present invention is shown. The tensioner A1 includes a housing 2 , a first shaft member 3 , a second shaft member 4 , a torsion spring 5 , a guide 6 and a partition 7 .

[0050] The housing 2 has a cylindrical portion 2 a and a flange portion 2 b extending in a substantially orthogonal direction from the cylindrical portion 2 a. In addition, an accommodation hole 2c is formed extending in the axial direction (the pushing direction) from the cylindrical portion 2a to the flange portion 2b. The front end portion of the storage hole 2c is open, and an assembly of the first and second shaft members 3 and 4, the torsion spring 5, and the partition plate 7 is accommodated in the storage hole 2c.

[0051] The flange portion 2b is used for attachment to an engine body as a device used, and is formed with an attachment hole 2d through which a bolt (not shown) screwed to the engine body passes. When installing to the en...

Embodiment 2

[0065] figure 2 The tensioner A2 of the second embodiment of the present invention is shown. In this embodiment, on the basis of the support seat 15 as a support component, an annular guide 25 as another support component is also provided.

[0066] A press-fit stepped portion 2g is formed on the inner surface of the housing 2 facing the shaft portion 3a of the first shaft member 3, and the annular guide 25 is fixed in the housing 2 by press-fitting the press-fit stepped portion 2g. Such an annular guide 25 serves to rotatably support the outer peripheral surface of the shaft portion 3a.

[0067] An engaging notch 3h extending in the axial direction is formed in the shaft portion 3a of the first shaft member 3, and the hook portion 5b on the other side of the torsion spring 5 is inserted into the hook groove 3f and engaged.

[0068] In this structure, the shaft portion 3a is supported by the support seat 15 on the side of the shaft end portion 3f, and the middle portion is s...

Embodiment 3

[0070] Figure 3 ~ Figure 5 It shows the tensioner A3 of the third embodiment of the present invention.

[0071] In this embodiment, the first shaft member 3 has a structure divided into two parts of a shaft portion 31 and a threaded shaft portion 32 . The shaft portion 31 is located on the base end side, the threaded shaft portion 32 is located on the distal side (the second shaft member 4 side), and the second shaft member 4 has an external thread portion 8 for screwing on its outer peripheral surface.

[0072] The shaft portion 31 and the threaded shaft portion 32 adopt a structure in which opposite end surfaces engage with each other. That is, if Figure 6 and Figure 7 As shown, a flange portion 3c that abuts against the partition plate 7 is formed on the proximal end surface of the threaded shaft portion 32, and a fitting protrusion 32a with a circular cross section protrudes from the flange portion 3c, and a card with a rectangular cross section The fitting protrusi...

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PUM

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Abstract

A structure behaving stably even if the structure receives an input of high speed from an engine. A first shaft (3) and a second shaft (4), fixed through screw sections (8, 9), and a torsion spring (5) for rotationally urging the first shaft member (3) into one direction are received in a case (2), restraining the rotation of the second shaft member (4) to convert the rotational urging force of the torsion spring (5) into a propulsion force of the second shaft member (4). An elastic member (20) for axially urging the first shaft member (3) is provided, the elastic member (20) urging the first shaft member (3) such that a shaft end (3f) of the first shaft member (3) is in close contact with the case (2). Supporting members (25, 27) supporting the first shaft member (3) at at least two positions in the axial direction are arranged in the case (2).

Description

technical field [0001] The present invention relates to a tensioner for maintaining constant tension of an endless belt or chain. Background technique [0002] Tensioners are used to push timing chains and timing belts used on automobile engines with a predetermined force to maintain a constant tension when these parts are tightened or loosened. [0003] Figure 12 A state in which the tensioner 100 is mounted on the engine body 200 of the automobile is shown. A pair of cam sprockets 210 , 210 and a crank sprocket 220 are arranged inside the engine body 200 , and an endless timing chain 230 is stretched between these sprockets 210 , 210 , 220 . In addition, a freely swingable chain guide 240 is disposed on the moving path of the timing chain 230 , and the timing chain 230 can slide on the chain guide 240 . A mounting surface 250 is formed on the engine body 200 , and the tensioner 100 is fixed to the mounting surface 250 by bolts 270 passing through mounting holes 260 of t...

Claims

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Application Information

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IPC IPC(8): F16H7/08
CPCF16H7/08F16H2007/081F16H2007/0806
Inventor 高桥郁臣天野种平小林贵雄
Owner NHK SPRING CO LTD
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