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Tensioner

A technology of tensioner and shaft components, applied in belts/chains/gears, mechanical equipment, transmissions, etc., can solve problems such as increased friction, increased engine output loss, inappropriateness, etc., to reduce output loss and stabilize amplitude. The effect of suppression, fine and stable amplitude suppression

Inactive Publication Date: 2009-07-22
NHK SPRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, in these corresponding structures, conversely, the propulsion (advance) characteristic of the propulsion shaft 130 tends to be enhanced
In addition, when the propulsion shaft 130 is pushed beyond the required amount, excess tension will be applied to the chain, and the friction between the chain guide 240 and the chain 230 will increase, which will cause the output loss of the engine to increase, so it is not suitable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] figure 1 Is a longitudinal cross-sectional view showing the tensioner A1 of the first embodiment of the present invention, figure 2 Yes figure 1 Sectional view of the F-F line. The tensioner A1 includes a housing 2, a first shaft member 3, a second shaft member 4, a torsion spring 5, a bearing 6, a partition 7 and a resistance torque addition mechanism 20.

[0095] The housing 2 is substantially shaped into a bottomed cylindrical shape having a flange portion 2b at the middle portion of the cylindrical portion 2a. In addition, a housing hole 2c extending in the axial direction (propelling direction) to the front end is formed inside the cylindrical portion 2a. The front end portion of the accommodation hole 2c is opened, and a combination of the first shaft member 3, the second shaft member 4, the torsion spring 5, the partition plate 7 and the resistance torque adding mechanism 20 is accommodated in the accommodation hole 2c.

[0096] The flange portion 2b of the housi...

Embodiment 2

[0133] Figure 6 It is a longitudinal cross-sectional view of the tensioner A2 of the second embodiment of the present invention.

[0134] In the second embodiment (A2), the cylindrical portion 4b is cut away from the base end 4a of the second shaft member 4 in the first embodiment (A1) to form a separate cylindrical member 41. Other configurations are the same as the embodiment One (A1) is the same. That is, the second shaft member 4 in the second embodiment (A2) is composed of the main member 40 and the cylindrical member 41 corresponding to the base end 4a of the second shaft member 4 in the first embodiment (A1).

[0135] Figure 7 Is a longitudinal cross-sectional view showing the cylindrical member 41, Figure 8 Is its top view.

[0136] Such as Figure 8 As shown, the cylindrical member 41 is formed into a non-circular cross-sectional shape with parallel cutting portions 41c and 41d on both the inner surface and the outer surface. The inner and outer surfaces of the cylin...

Embodiment 3

[0157] Figure 15 Is a longitudinal sectional view showing the tensioner A3 of the third embodiment of the present invention, Figure 16 Yes Figure 15 Sectional view of line H-H.

[0158] Such as Figure 15 As shown, the tensioner A3 of this embodiment is different from the above-mentioned embodiment only in the configuration of the resistance torque addition mechanism 20, which uses the configuration of the second shaft member 4 and the third shaft member 21 to be turned upside down The structure and other structures are basically the same as the above-mentioned embodiment. That is, the resistance torque adding mechanism 20 is configured such that the third shaft member 21 screwed to the threaded portion 3b of the first shaft member 3 is arranged on the lower side of the base end of the second shaft member 4, and the connecting member is connected by the coil spring 22 50 is connected to the second shaft member 4.

[0159] Figure 17 It is a longitudinal cross-sectional view s...

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Abstract

A tensioner capable of stably suppressing amplitude even for a strong input vibration load from an engine, the suppression being made over a wide range of engine speed both in advancing operation and retreating operation. A first shaft member (3) and a second shaft member (4) screwed to each other by screw portions (8, 9) and a return spring (5) for rotatingly urging the first shaft member (3) in one direction are received in a case (2). The second shaft member (4) is restrained from rotation, and a rotation urging force by the return spring (5) is converted into a propulsive force of the second shaft member (4). A resisting torque applying mechanism (20) is placed between the first shaft member (3) and the second shaft member (4), and the mechanism constantly produces, both in advancing operation and retreating operation, resisting torque against an external input load inputted in the second shaft member (4), finely and stably suppressing the amplitude of the second shaft member (4).

Description

Technical field [0001] The invention relates to a tensioner used to adjust the tension of an endless belt or a chain to keep it constant. Background technique [0002] The function of the tensioner is to press a timing chain or a timing belt used in, for example, a car engine with a prescribed force, and when these are stretched or slackened, the tension is kept constant. [0003] Figure 25 It is a layout diagram showing a state when the tensioner 100 is mounted on the engine body 200 of an automobile. A pair of cam sprockets 210, 210 and a crankshaft sprocket 220 are arranged inside the engine body 200, and an endless timing chain 230 is bridged between these sprockets 210, 210, 220. In addition, a chain guide 240 is arranged on the moving path of the timing chain 230 to be freely swingable, 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 with a bolt 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H7/08
CPCF16H7/08F16H2007/0857F16H2007/081
Inventor 小林贵雄天野种平
Owner NHK SPRING CO LTD
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