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Tensioner

A technology of tensioning device and shaft member, applied in the direction of transmission device, belt/chain/gear, mechanical equipment, etc., can solve the problems of inadvertent entry and exit of transmission shaft, stopper falling off, troublesome packaging, etc., and achieve a cheap tensioning device. Effect

Active Publication Date: 2008-04-16
NHK SPRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an engine with a relatively small displacement of about 50 cc, since the torque of the spring 133 is weak, the fixing force for holding the stoppers 137 and 138 is also weak.
Therefore, the stopper is likely to fall off from the housing 111 due to vibrations during transportation, etc., and the rotation stop state of the rotating shaft 130 is released due to this fall, so there is a problem that the transmission shaft enters and exits inadvertently.
[0016] In order to prevent such a stopper from coming off, a tape is attached to cover the stopper, however, it is necessary to perform the operations of attaching the tape and peeling off the adhesive tape, and there is a problem that operability decreases.
In addition, when packing the tensioner, there is a type of packing so that the stopper does not come off, but at this time, there is a problem that packing is very troublesome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0060] 1 to 5 show a tensioner 1 according to a first embodiment of the present invention, FIG. 1 is a cross-sectional view illustrating an inserted state of a stopper, FIG. 1, FIG. 4 is a side view and a plan view of the stopper, and FIG. 5 is a perspective view showing an inserted state of the stopper.

[0061] As shown in FIGS. 2 and 3 , the tensioner 1 includes a housing 2 , a first shaft member 3 , a second shaft member 4 , and a spring 5 .

[0062] The housing 2 includes: a trunk 2a; a flange portion 2b extending in a substantially vertical direction from the trunk 2a; and a housing hole 2c formed inside the trunk 2a in an axial direction (a pushing direction). The front end portion in the axial direction of the accommodation hole 2c is opened, and the first shaft member 3, the second shaft member 4, and the spring 5 are accommodated in the accommodation hole 2c. The flange part 2b is used for mounting the engine main body, and is formed with a mounting hole 2d through ...

no. 2 approach

[0080] 6 and 7 show a second embodiment of the present invention. As shown in FIG. 6, the front of the stopper 15 of this embodiment is formed in an omega shape, the leg 15a is located in the central part, and action parts 15c are provided on both sides of the leg 15a. These parts are made of resin material, rubber material, etc. Wait for the whole to form. The action part 15c extends in the left-right direction from the base end part of the leg part 15a in a bent state, and stands upright along the leg part 15a, and the front-end|tip part becomes a free end. In addition, the connecting parts of the left and right action parts 15c relative to the legs 15a are bent so that the free ends of the left and right action parts 15c are close to the direction of the legs 15a, so that the action parts 15c have elasticity that can be elastically deformed.

[0081] And the convex part 15d which protrudes toward the leg part 15a direction is formed in the surface which opposes the leg par...

no. 3 approach

[0085] 8 and 9 show a third embodiment of the present invention. As shown in FIG. 8, the action part 15c of the stopper 15 of this embodiment is formed in the leg part 15a. The left and right action parts 15c are integrally formed obliquely so as to widen from the front end of the leg part 15a in the left and right directions, and the action parts 15c have elasticity to be elastically deformable due to such inclination. The maximum separation distance Z of the left and right action parts 15 c is set to be larger than the width of the notch 12 of the first shaft member 3 . In addition, a wide fixing portion 15b is formed at the base end portion of the leg portion 15a as a whole. The stopper 15 of this embodiment may also be integrally formed of a single material such as a resin material, a rubber material, or a metal material. It is not limited to this, You may form each member including the action|action part 15c with another material, you may combine and integrate it.

[0...

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PUM

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Abstract

A tensioner (1) capable of securely preventing a stopper from being fallen off a case even by a simple structure if the stopper used is inexpensive. A first shaft member (3) and a second shaft member (4) threaded with each other through screw parts (8) and (9) and a spring (5) rotatingly energizing the first shaft member (3) in one direction are stored in the case (2). The rotatingly energizing force of the spring (5) is converted into the driving force of the second shaft member (4) by arresting the rotation of the second shaft member (4). The stopper (15) bringing the first shaft member (3) into a rotation stop state against the rotating energizing force of the spring (5) by engaging with the first shaft member (3) can be inserted into the case (2). Thus, the stopper (15) can be prevented from falling off the case (2) since it is fitted to the case (2) or the first shaft member (3) to generate a frictional force.

Description

technical field [0001] The present invention relates to a tensioning device capable of maintaining a constant tension on endless belts and chains. Background technique [0002] The tensioning device pushes the timing chain and timing belt, such as those used in automobile engines, with a preset force, and maintains a certain tension when it elongates and relaxes. [0003] FIG. 21 shows a state in which the tensioner 100 is actually mounted on an automobile engine main body 200 . Lubricating oil (not shown) is sealed inside the engine main body 200 . In addition, a pair of cam sprockets (cam sprockets) 210, 210 and a crank sprocket (crank sprocket) 220 are arranged inside the engine main body 200, and a timing chain 230 is hung between these sprockets 210, 210, 220 in an annular shape. between. In addition, a freely swingable chain guide 240 is disposed on a movement path of the timing chain 230 , and the timing chain 230 can slide on the chain guide 240 . [0004] The te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H7/08
CPCF16H2007/0878F16H2007/0857F16H7/0848F16H2007/081
Inventor 小林贵雄天野种平高桥郁臣井上史久
Owner NHK SPRING CO LTD