CN101627227B - Tensioner - Google Patents
Tensioner Download PDFInfo
- Publication number
- CN101627227B CN101627227B CN2008800072591A CN200880007259A CN101627227B CN 101627227 B CN101627227 B CN 101627227B CN 2008800072591 A CN2008800072591 A CN 2008800072591A CN 200880007259 A CN200880007259 A CN 200880007259A CN 101627227 B CN101627227 B CN 101627227B
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- axle part
- part spare
- friction means
- elastic member
- friction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
- F16H7/0831—Means for varying tension of belts, ropes, or chains with vibration damping means of the dry friction type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0802—Actuators for final output members
- F16H2007/081—Torsion springs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
A tensioner adapted so that a second shaft member is stably propelled. An inner first shaft member (3) and an outer second shaft member (4), which are connected by screw sections (8, 10), and an urging spring (5) for urging the first shaft member (3) in one direction are received in a case (2). Rotation of the second shaft member (4) is restrained, and rotational urging force of the urging spring (5) is converted into propelling force of the second shaft member (4). The first shaft member (3) is rotated with its shaft end portion directly or indirectly in contact with the case (2). A friction member (6) for generating frictional force between itself and the first shaft member (3) is provided so as to be directly or indirectly in contact with the first shaft member (3). An elastic member (7) is provided on the radially outer side of the second shaft member (4). The elastic member (7) urges the friction member (6) in the direction in which it is in contact with the first shaft member (3), and this stabilizes propelling of the second shaft member (4).
Description
Technical field
The present invention relates to a kind of tension force and keep certain stretcher non-joint (annular) band or chain.
Background technique
Stretcher has following effect, that is, push such as used timing chain of motor car engine or band synchronously with the strength of regulation, when timing chain or take existing elongation synchronously out of or when lax, also will keep its tension force certain.
Figure 18 illustrates stretcher 100 is installed to the state on the motor car engine main body 200.In engine main body 200 internal configurations pair of cams sprocket wheel 210,210 and crankshaft sprocket 220 are arranged, timing chain 230 is the non-joint shape, and is erected between sprocket wheel 210,210 and 220.On the mobile route of timing chain 230, chain guiding device 240 is disposed in swing freely, and timing chain 230 slides on chain guiding device 240.On engine main body 200, be formed with attachment face 250, the bolt 270 of the mounting hole 260 of stretcher 100 through running through attachment face 250 is fixed on the attachment face 250.Though omitted diagram at this, enclosed the lubricant oil that lubricated usefulness is arranged in the inside of engine main body 200.
Figure 19 and Figure 20 illustrate common employed stretcher 100, in housing 110 inner assembled configuration running shaft 120 and cardan shaft 130 are arranged.Housing 110 have the main part 111 that extends vertically in order to insert above-mentioned axle 120,130 and from main part 111 beginnings along the flange part 112 that extends with axial direction of intersecting.Flange part 112 is used for stretcher 100 is installed on motor 200, therefore, on flange part 112, is formed with and is used for the mounting hole that bolt ran through 113 that is threaded with engine main body 200.Therefore each parts that main part 111 is stated after being used to accommodate, are formed with the reception hole 114 of same diameter vertically in inside.
Outer surface at running shaft 120 forms external thread part 121, and forms internal thread 131 at the internal surface of cardan shaft 130, and above-mentioned screw section 121,131 is threaded, thereby realizes the assembling of running shaft 120 and cardan shaft 130.With end corresponding shell 110 inside of running shaft 120 bottoms (cardinal extremity) side, be provided with bearing 140 with the mode that is arranged in reception hole 114, and the bottom through bearing 140 supporting rotating shafts 120.Under the state of assembling, cardan shaft 130 is threaded with the roughly half the part in the front side of running shaft 120, and disposes the force application spring 150 that is made up of torsion spring in the roughly half the part of the rear side that is not threaded with cardan shaft 130.
The hook portion 151 of one end of force application spring 150 is inserted into engaging in the slit (slit) 123 of the bottom that is formed on running shaft 120, and the other end hook portion 152 is fastened in the housing 110.Therefore, when through reversing the state of moment that force application spring 150 applies regulation down during assembling, then running shaft 120 rotates through the active force of force application spring 150.
At the head portion of housing 110, through positioning ring 170 rigid bearings 160, cardan shaft 130 runs through the sliding eye 161 of bearing 160.It is non-circular that sliding eye 161 internal surfaces of bearing 160 and the outer surface of cardan shaft 130 form other of substantially elliptical or parallel cutting, and like this, cardan shaft 130 is in the state that is limited to rotate.
Bearing 160 forms the writing board shape of predetermined thickness, is formed with a plurality of fixed plates 162 at outer circumferential side.And fixed plate 162 is entrenched in the gap slot 115 of the head portion that is formed at housing 110, thereby makes the integral body of bearing 160 be in the state that is limited to rotate.Like this, rotate with respect to housing 110 through restriction bearing 160, and make the cardan shaft 130 that has run through bearing 160 be limited in rotation in the housing 110, so cardan shaft 130 is advanced and retreat with respect to housing 110 under this restriction rotation status through bearing 160.
On the top of cardan shaft 130 top cover 180 is installed, and this top cover 180 contacts with above-mentioned engine main body 200 interior chain guiding devices 240.
Internal configurations at housing 110 has lining 190.Lining 190 forms the tubular that extends along axially (direction of propulsion) with the mode around running shaft 120 and the cardan shaft 130 of surrounding, and prevents that the running shaft 120 and the cardan shaft 130 that are in the state of being threaded from deviating from from the head portion of housing 110.Thisly deviate from order to prevent to cause, running shaft 120 form can with the band eaves shape of lining 190 collisions.
In the stretcher 100 of said structure, because running shaft 120 is rotated according to the active force of force application spring 150, and this rotating force is converted into the thrust of cardan shaft 130, thereby cardan shaft 130 is passed in and out.Thus, cardan shaft 130 compresses timing chain 230 through top cover 180 and chain guiding device 240, so, can give tension force to timing chain 230.
Following problem appears in Figure 19 and stretcher 100 shown in Figure 20; Promptly; Running shaft 120 through the force application spring 150 rotation application of forces skids and rotates or slight positive and negative rotation; Because the unsettled spinning movement of such running shaft 120 causes cardan shaft 130 to carry out the problem of unsettled advance and retreat motion.In order to prevent the unsettled spinning movement of above-mentioned running shaft 120, at present, disclosure has the Japanese documentation spy to open the 2005-180661 communique, the Japanese documentation spy drives the stretcher that the 2003-184968 communique is put down in writing.
The Japanese documentation spy drives the stretcher of 2005-180661 communique, on running shaft, forms the pressure ring of eaves shape, on the other hand, will have the opposed clasp in compartment of terrain with pressure ring and be pressed in the housing, and between these pressure rings and clasp, dispose pressure spring.Mode to be coated at running shaft disposes pressure spring under compressive state.Like this, pressure spring carries out the application of force through pressure ring, makes the shaft end of running shaft and housing be close to.Through this application of force, running shaft has good friction torque, and is close to housing, so, can prevent the unstable spinning movement of running shaft.
The Japanese documentation spy drives the stretcher of 2003-184968 communique, with compressive state pressure spring is configured between running shaft and the cardan shaft.Pressure spring is placed under the state of running shaft outside, is configured to two end part and running shaft and cardan shaft butt.In this structure, owing between pressure spring and running shaft, produce friction torque is arranged, so, prevent the unstable spinning movement of running shaft through this friction torque.
Japanese documentation 1: the spy opens the 2005-180661 communique
Japanese documentation 1: the spy opens the 2003-184968 communique
Open the 2005-180661 communique and the Japanese documentation spy opens in the stretcher of 2003-184968 communique the Japanese documentation spy, owing to prevented the unstable spinning movement of running shaft, so the stable advance and retreat of cardan shaft.For this reason, according to the type of motor, require to have the unstable turn that prevents running shaft more forcefully to make, can make the stable stretcher of advancing and retreat and can guarantee stable action thus of cardan shaft.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of stretcher that can guarantee operating stably.
Stretcher according to first aspect present invention; In housing, contain the second axle part spare and the force application spring that along a direction said the first axle part spare is applied rotating force in the first axle part spare and the outside of the inboard that is threaded through the screw section; Through limiting the rotation of said the second axle part spare; The rotating force that said force application spring is applied converts the thrust of said the second axle part spare into; Said stretcher is characterised in that; Said the first axle part spare is rotated at shaft end directly or indirectly with under the said housing state of contact; Be arranged to contact with said the first axle part spare with the friction means that produces friction torque between the said the first axle part spare, be provided with elastic member at the radial outside of said the second axle part spare, the direction that said elastic member contacts with said the first axle part spare to said friction means is to the said friction means application of force.
In the stretcher of first aspect present invention, contact with the first axle part spare through friction means, between friction means and the first axle part spare, produce friction torque.Because the direction that elastic member contacts with the first axle part spare to friction means is to the friction means application of force, so, can guarantee friction torque.Elastic member is configured in the radial outside of the second axle part spare, and the second axle part spare is configured in the outside with respect to the first axle part spare of inboard.
In the structure of the stretcher of first aspect present invention; Because elastic member is configured in the radial outside of the second axle part spare that is positioned at the first axle part spare outside; So its tangential force is less than by the first axle part spare of inboard and the friction torque between the friction means and the tangential force that produces.Therefore, through the moment from friction means, the power that elastic member is reversed reduces significantly, so elastic member has the effect that the shaft end that makes the first axle part spare and housing contact reliably.Like this, can prevent that the first axle part spare from skidding or fine positive and negative rotation, the second axle part spare that is threaded with the first axle part spare carries out stable advance and retreat motion.
The stretcher of second aspect present invention is the stretcher according to first aspect present invention, and said elastic member contacts with said friction means with the contact diameter greater than the contact diameter of said the first axle part spare and said friction means.
The stretcher of third aspect present invention is the stretcher according to first aspect present invention or second aspect present invention, and the surface of contact of said friction means and said the first axle part spare tilts with the axial mode of intersecting with said the first axle part spare.
According to the present invention; Be provided with direction from said the first axle part spare to said friction means that contact with elastic member to the said friction means application of force through radial outside at the second axle part spare; Reduce the power of torsional elasticity parts; So elastic member can be brought into play the effect of the active force that the shaft end that makes the first axle part spare contacts with housing effectively.Therefore, the spinning movement of the first axle part spare is stable, and the stable advance and retreat of the second axle part spare that is threaded with the first axle part spare.
Description of drawings
Fig. 1 is the plan view of the stretcher of expression first embodiment of the invention;
Fig. 2 is the sectional view along X1-X1 line among Fig. 1;
Fig. 3 is the sectional view along X2-X2 line among Fig. 2;
Fig. 4 (a) and Fig. 4 (b) are the plan view and the ground plans of the used the first axle part spare of expression first mode of execution;
Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) they are the planimetric maps of the used the second axle part spare of expression first mode of execution, along the sectional view and the left side view of X3-X3 line;
Fig. 6 (a) and Fig. 6 (b) are the planimetric maps of the used friction means of first mode of execution and along the sectional view of X4-X4 line;
Fig. 7 is the sectional view of the stretcher of expression second embodiment of the invention;
Fig. 8 is the sectional view along X5-X5 line among Fig. 7;
Fig. 9 (a), Fig. 9 (b) and Fig. 9 (c) they are the planimetric maps of the used friction means of expression first mode of execution, along the sectional view and the ground plan of X6-X6 line;
Figure 10 is the partial cross section figure of the mode of texturing of expression second mode of execution;
Figure 11 is the sectional view of the stretcher of expression third embodiment of the invention;
Figure 12 is the sectional view of the used friction means of the 3rd mode of execution;
Figure 13 is the partial cross section figure that the effect to the 3rd mode of execution describes;
Figure 14 is the partial cross section figure that the friction torque to the 3rd mode of execution describes;
Figure 15 is the partial cross section figure of the mode of texturing of expression the 3rd mode of execution;
Figure 16 is the performance diagram of friction torque of the mode of texturing of expression Figure 15;
Figure 17 is the sectional view of expression four embodiment of the invention;
Figure 18 is the local main sectional view that expression is installed in stretcher the state on the engine main body;
Figure 19 is the plan view of the existing stretcher of expression; And
Figure 20 is the sectional view along Q-Q line among Figure 19.
Description of reference numerals
A1, A2, A3, A4 stretcher 2 housings
3 the first axle part spares, 4 the second axle part spares
5 force application springs, 6 friction means
7 elastic members, 8 outside threads
9 bearings, 10 internal threads
Embodiment
Below, with reference to illustrated mode of execution, the present invention is described particularly.In addition, in each mode of execution,, mark corresponding like-identified for same parts.
Fig. 1 to Fig. 6 illustrates the stretcher A1 of first embodiment of the invention.Stretcher A1 comprises housing 2, the first axle part spare 3, the second axle part spare 4, force application spring 5, friction means 6 and elastic member 7.
The flange part 2b of housing 2 is used on engine main body, installing, and is formed with the mounting hole 2j that the bolt that is threaded with engine main body (omitting diagram) is run through.Through flange part 2b is installed on the engine main body, thereby the integral body of the main part 2a that will elongate from the 2b of flange disc portion is inserted into engine main body inside.Like Fig. 1 and shown in Figure 3, on main part 2a, a plurality of positions on circumference are formed with the window shape slit 2d along the length direction of main part 2a.Through forming window shape slit 2d, can the lubricant oil in the engine main body be imported in the housing 2, so the scorification can prevent to move the time.
Configuration the first axle part spare 3 and the second axle part spare 4 make it overlapping on diametric(al), and the first axle part spare 3 is positioned at the inboard, and the second axle part spare 4 is positioned at the outside.The first axle part spare 3 is rotated through applying rotating force by force application spring 6, and the second axle part spare 4 advances from housing 2 through 3 rotations of the first axle part spare.
Like Fig. 2 and shown in Figure 4, the first axle part spare 3 forms, and comprises the axial region 3a of flange part 2b side and the screw spindle part 3b that extends vertically from axial region 3a, and is formed with outside thread (screw section) 8 in the periphery of screw spindle part 3b.Outside thread 8 is formed in the roughly length range of screw spindle part 3b.Be formed with the slit 3e that inserts the top that is used to make the rolling-in anchor clamps (not shown) that the first axle part spare 3 is rotated at the shaft end of axial region 3a.Slit 3e is communicated with the anchor clamps hole 2e of the flange part 2b that runs through housing 2, and through 2e makes the first axle part spare 3 be rotated through slit 3e to the top that slit 3e inserts the rolling-in anchor clamps from the anchor clamps hole, thereby can rolling-in force application spring 5.After rolling-in force application spring 5, be threaded through making sealing bolt (not shown), thus seal clamp hole 2e.
The first axle part spare 3 inserts the bearing 9 that is arranged in the housing 2 through the shaft end (underpart among Fig. 1 and Fig. 4) of axial region 3a, thereby is supported rotation.Owing to be inserted into bearing 9, so the bottom surface of the shaft end of axial region 3a contacts with the end face of bearing 9.The shaft end of axial region 3a contacts with bearing 9, thereby between the first axle part spare 3 and bearing 9 (promptly, housing 2), produces friction torque, has in generation under the state of friction torque, and first 3 is rotated.In addition, also bearing 9 can be set in housing 2, and make the shaft end of axial region 3a directly contact the internal surface of housing 2.
The shaft portion 3a and 3b of the screw shaft portion to the connecting portion is provided with a constriction means (link portion) 3d.The diameter of joint 3d like this, forms the surface of contact 3f in the outside that is positioned at joint 3d less than the diameter of axial region 3a on axial region 3a.Of the back, surface of contact 3f contacts with friction means 6.
Like Fig. 2 and shown in Figure 5, the second axle part spare 4 forms tubular, and is formed with the internal thread (screw section) 10 that is threaded with the outside thread 8 of the first axle part spare 3 at the internal surface of bottom side.On the second axle part spare 4, the periphery that is formed with the part of internal thread 10 is circle, and the periphery of other parts except this circular portion becomes non-circular through carrying out parallel cutting.In Fig. 5,4a is a circular portion, and 4b is a non-circular portion.On the top of the second axle part spare 4 top cover 11 is installed, is lockable through being pressed into spring pin 12.
As shown in Figure 2, guider (ガ イ De) 13 is installed on the head portion of housing 2, and fixing through circlip 14.Guider 13 has sliding eye 13a, and the non-circular portion 4b of the second axle part spare 4 can run through sliding eye 13a slidably.The internal surface of sliding eye 13a forms identical non-circular of non-circular portion with the second axle part spare 4.Therefore, though guider 13 allows the second axle part spare 4 to move vertically, has the effect of restriction the second axle part spare 4 rotations.In addition, the sliding eye 13a of guider 13 and the non-circular portion 4b that runs through the second axle part spare 4 of sliding eye 13a also can be that D cutting shape, substantially elliptical or polygon etc. are non-circular.
In this embodiment, use disc spring as force application spring 5.The force application spring 5 that is made up of disc spring is arranged on the axial region 3a outside of the first axle part spare 3.As shown in Figure 3, a distolateral hook portion 5a of force application spring 5 is inserted among the window shape slit 2d that is formed at housing 2 and is stuck, and is as shown in Figure 2 on the other hand, and another distolateral hook portion 5b is inserted among the slit 3e of axial region 3a and is stuck.Like this, give moment through rolling-in force application spring 5, thus, force application spring 5 applies rotating force along a direction to the first axle part spare 3.The rotating tee that is applied in first rotary component 3 of rotating force is crossed the screw section 8,10 that is threaded and is passed to the second axle part spare 4, but because the second axle part spare 4 is directed to device 13 restriction rotations, so the second axle part spare 4 is advanced and retreat with respect to housing 2.
As shown in Figure 2, friction means 6 is enclosed within outward on the joint 3d of the first axle part spare 3.As shown in Figure 6, friction means 6 forms circular tabular, and entreats part to be formed with the 6a of hole portion of the screw spindle part 3b diameter that is slightly larger than the first axle part spare 3 therein.Like this, friction means 6 is configured to rotate freely with respect to the first axle part spare 3.Through friction means 6 is installed to the first axle part spare 3, thereby friction means 6 contacts with the surface of contact 3f of the first axle part spare 3, and between friction means 6 and the first axle part spare 3, produces friction torque through this contact.
As shown in Figure 2, in this embodiment, the end of friction means 6 sides of elastic member 7 is formed with (spring) end and polishes circle, and, its part end face is carried out abrasive machining.Be formed as described above (spring) end bull ring, the stability of elastic member 7 improves, and can stable masterpiece be used for friction means 6.And, through face machined flat, can make the stability raising of elastic member 7 and apply stable power, simultaneously, can reduce crush pad, and realize miniaturization friction means 6.In the present invention, be not to be defined in this, can not form (spring) end in the end and polish circle, yet abrasive machining end face not.And, have or not to form above-mentioned (spring) end and polish circle, have or not face machined flat, after also can likewise be suitable in other the mode of execution stated.
Then, the effect to this mode of execution describes.The first axle part spare 3 contacts with bearing 9 with contact radius r1, and elastic member 7 contacts with friction means 6 with contact radius r2.Here, because elastic member 7 is arranged on the radial outside of the second axle part spare 4 in the first axle part spare 3 outsides, so, be the relation of r1＜r2.Elastic member 7 is by deflection configuration, so elastic member 7 utilizes axial load W that friction means 6 and the first axle part spare 3 are pushed to the direction that is close to housing 2.Under this state, when receiving from motor when vibrating, the first axle part spare 3 carries out crankmotion.Because the crankmotion of the first axle part spare 3, friction torque T1 acts between the first axle part spare 3 and the friction means 6.Here, T1=Wr1 μ, μ are the friction factor between friction means 6 and the first axle part spare 3.
Friction means 6 rotates freely with respect to the first axle part spare 3, but owing between friction means 6 and the first axle part spare 3, produce friction torque T1, so friction means 6 rotates with the first axle part spare 3, and elastic member 7 is acted on the moment of torsional directions.In this case, on the surface of contact of the shaft end of the first axle part spare 3 and bearing 9, producing has the tangential force P1 (P1=T1/r1) based on friction torque T1, and simultaneously, between elastic member 7 and friction means 6, producing has tangential force P2 (P2=T1/r2).The relation of tangential force P1, P2 is, because of r1＜r2, so, P1＞P2.Tangential force is a shearing stress, because P1＞P2, so the moment of torsional elasticity parts 7 reduces significantly.And the face (axial end of the first axle part spare 3) that the first axle part spare 3 slides is restricted to contact radius r1, so the both non-slip rotation of the first axle part spare 3 is not stopped the rotation again, and can prevent trickle positive and negative rotation.Therefore, be the stretcher that a kind of the second axle part spare 4 that is threaded with the first axle part spare 3 is advanced and retreat and moved and guarantee operating stably with stable amplitude.
And, in this embodiment, through elastic member 7 being configured in the outside of lining 16, thereby can dispose the first axle part spare 3, the second axle part spare 4, lining 16 and elastic member 7 along diametric(al).Therefore, the stretcher A1 that axial length has shortened can be become, short and smallization of stretcher can be realized.
Fig. 7 to Fig. 9 illustrates the stretcher A2 of second mode of execution of the present invention.In stretcher A2, be formed with head 16a on the lining 16 of tubular.Head 16a is formed on the axial head portion (top part) of lining 16, and at its outer peripheral portion the distolateral of elastic member 7 is installed.The outer peripheral portion of guider 13 sides of head 16a is the conical surface 16b that tilts to bottom side.The curved section butt of conical surface 16b and guider 13.From the moment loading of elastic member 7 in lining 16, thereby adjustment lining 16, so, have the advantage that can not dispose elastic member 7 with diametrically evenly (having and exist partially).
Contact with friction means 6 because another of elastic member 7 is distolateral, so another of friction means 6 supporting elastic members 7 is distolateral.As shown in Figure 9, friction means 6 forms the stair-stepping while of secondary at its outer peripheral portion, and it is stepped that the 6a of hole portion of central authorities forms secondary.It is distolateral to be inserted into another of elastic member 7 at the stair-stepping outer peripheral portion of secondary, and contacts with elastic member 7 because this contact, elastic member 7 in the direction that friction means 6 is contacted with the first axle part spare 3 to friction means 6 application of forces.Because the outer peripheral portion of the stair-stepping friction means 6 of above-mentioned secondary is inserted in the elastic member 7,, therefore, can prevent that elastic member 7 from tilting so elastic member 7 is stable.
The shoulder part of axial region 3a in the first axle part spare 3 contacts with the 6a of hole portion of the stair-stepping friction means 6 of secondary.This contact makes between friction means 6 and the first axle part spare 3 and produces friction torque.Through insert the shoulder part of axial region 3a at the stair-stepping hole 6a of portion of above-mentioned secondary, can prevent the position deflection of friction means 6 and the first axle part spare 3, thereby, can obtain stable friction torque.Other structure is identical with first mode of execution.This mode of execution also can have same effect with first mode of execution.Especially, in this embodiment, be that secondary is stepped through outer peripheral portion and the 6a of hole portion that makes friction means 6, and guiding the first axle part spare 3 and elastic member 7, so can prevent off-centre, position deflection.In view of the above, can make the advance and retreat of the second axle part spare 4 that is threaded with the first axle part spare 3 more stable, and can make the action of stretcher more stable.In this case, also can be that arbitrary side with the outer peripheral portion of friction means 6 or the 6a of hole portion is as the stair-stepping structure of secondary.
Figure 10 illustrates the variation of this mode of execution.In the stretcher of this mode of execution, the joint 3d that makes the first axle part spare 3 is that secondary is stepped, simultaneously, between joint 3d and axial region 3a, end difference is set.In friction means 6, insert the major diameter part of joint 3d, and under this insertion state, contact with the surface of contact 3f of axial region 3a upper surface.Tilt owing in the structure of Figure 10, also can prevent friction means 6, so, can prevent that elastic member 7 from tilting.And, off-centre, the position deflection of friction means 6 can be prevented, and stable action can be carried out with respect to the first axle part spare 3.
Figure 11 to Figure 15 illustrates the stretcher A3 of third embodiment of the invention.In stretcher A3, the torsion spring that uses coiled type is as force application spring 5.Along the extending axially of the first axle part spare 3 and the second axle part spare 4, the distolateral hook portion 5a of one of which is inserted among the slit 2g that is formed on the housing 2 and engages as the torsion spring of force application spring 5, and another distolateral hook portion 5b is inserted among the slit 3e of the first axle part spare 3 and engages.Therefore, give moment through rolling-in force application spring 5, force application spring 5 applies rotating force to a direction to the first axle part spare 3.
The shape that housing 2 extends from the intermediate portion of main body 2a for flange part 2b laterally, and the part of the above tip side of flange part 2b is inserted in the engine main body.Therefore, in this embodiment, the cardinal extremity of the main body 2a of housing 2 partly exposes the outside at engine main body.
In this embodiment, the friction means 6 double linings of makeing.Shown in figure 12, friction means 6 has support 6d, the 6e of lining portion and friction part 6f from tip side (upside) to terminal side (downside) integratedly.Lining 6e forms tubulars such as cylinder, and the first axle part spare 3 and the second axle part spare 4 are inserted into inside under the state of being threaded.Therefore, friction means 6 is configured in the radial outside of the second axle part spare 4.
The first axle part spare 3 is formed with large diameter contacting part 3h between axial region 3a and screw spindle part 3b.The outer surface of contacting part 3h is and the inclined surface of the true dip direction of friction part 6f same degree, contacts with contacting part 3h through friction part 6f, between friction means 6 and the first axle part spare 3, produces friction torque.Like this, owing to contacting part 3h is the plane of inclination with friction part 6f and contacts, thereby can increase friction torque.In Figure 12, r1 is the contact radius of friction part 6f when contacting with contacting part 3h.
With reference to Figure 13 the effect of this mode of execution is described.With the inclined angle alpha state of contact, when by elastic member 7 applied moment W, produce vertical resistance W ' for contacting part 3h and friction part 6f at the surface of contact of contacting part 3h and friction part 6f.Resistance W ' is directly related to the friction torque T1 that friction means 6 applies with the direction that contacts with the first axle part spare 3 to friction means 6, and when resistance W ' became big, then friction torque T1 also became big.Because above-mentioned W ' is W '=W/sin α, so, can make friction torque act on the first axle part spare 3 greater than the moment W of elastic member 7.In this case, when α diminishes, because W ' increase then can be adjusted friction torque T1 through adjustment α.
Shown in figure 14; When friction part 6f contacted with contacting part 3h in the zone of contact least radius r1b from contact maximum radius r1a, the friction torque T1 that between friction means 6 and the first axle part spare 3, produces was T1=(2/3) (μ W (r1ar1ar1a-r1br1br1b)/(r1ar1a-r1br1b) sin α).In this formula, for example, when W=30N, μ=0.15, α=30 °, when r1a=8mm, r1b=4mm, produce the friction torque T1 of 56Nmm.
The profile that Figure 15 illustrates the contacting part 3h that makes the first axle part spare 3 is the mode that friction part 6f circular, that make friction means 6 is in contact with it.At this moment friction torque T1 is T1=r1 μ W/sin α.For example, when W=30N, μ=0.15, α=30 °, during r1=6mm, produce the friction torque T1 of 54Nmm.
Figure 16 illustrates the variation of the friction torque T1 when inclined angle alpha is changed.Shown in figure 16, inclined angle alpha is more little, and friction torque T1 increases more.For example, ° compare with α=90, when α=30 °, friction torque T1 is 2 times.
In above-mentioned the 3rd mode of execution, reduce through making inclined angle alpha, can produce big friction torque T1.Therefore,, then increase degree of freedom in design, excessively like this, can design the stretcher of miniaturization through turning α down if during identical friction torque T1.
Figure 17 illustrates the stretcher A4 of four embodiment of the invention.In the stretcher A4 of this mode of execution, form the plane of inclination at the axial two end part of the axial region 3a of the first axle part spare 3.That is the plane of inclination 31,32 that the direction of, successively decreasing to diameter in tip side (upper end side) and bottom (lower end side) formation of axial region 3a tilts.
Plane of inclination 31 is corresponding with friction means 6, and plane of inclination 32 is corresponding with bearing 9, on friction means 6, be formed with the contact hole 33 of plane of inclination 31 inclination equal angular, bearing 9 is formed with the supporting surface 34 to tilt with plane of inclination 32 equal angular.Therefore, contact with contact hole 33 through plane of inclination 31, friction means 6 and 3 contacts of the first axle part spare can be given the first axle part spare 3 with the transmission of torque of elastic member 7.And, contacting with supporting surface 34 through plane of inclination 32, the first axle part spare 3 is rotated under the state that is supported by bearing 9 (promptly, housing 2).In addition, be formed with regulation projection 36, be used to suppress elastic member 7 and move to diametric skew on the surface of elastic member 7 sides of friction means 6.Like this, elastic member 7 does not contact with the second axle part spare 4.
In the above-described embodiment; When doing the time spent from the moment of elastomeric element 7, then pass through inclined plane 31 and contact hole 33, reach inclined plane 32 and supporting surface 34 quilt adjustment (aligning), so; Inclined plane 31 is closely contacted with supporting surface 34 with contact-making surface 33 and inclined plane 32, and non-migration.And, same with the stretcher of the 3rd mode of execution, according to the angle of plane of inclination 31,32, can make friction torque increase based on the moment of elastic member 7.
The present invention is not limited to above mode of execution, and various changes can be arranged.For example, can use except that springs the compression spring such as belleville springs as elastic member 7.
Claims (3)
1. stretcher; In housing, contain the second axle part spare and the force application spring that along a direction said the first axle part spare is applied rotating force in the first axle part spare and the outside of the inboard that is threaded through the screw section; Head portion at said housing is equipped with guider; Said guider has sliding eye, and the rotation of said the second axle part spare is limited and the non-circular portion of said the second axle part spare can run through in the sliding eye of said guider slidably, will convert the thrust of said the second axle part spare through the rotating force that the said screw section that is threaded applies to the said force application spring of the second axle part spare transmission into; Said stretcher is characterised in that
Said the first axle part spare is rotated at shaft end directly or indirectly with under the said housing state of contact; Be arranged to contact with the friction means that produces friction torque between the said the first axle part spare with said the first axle part spare; Radial outside at said the second axle part spare is provided with elastic member, and the direction that said elastic member contacts with said the first axle part spare to said friction means is to the said friction means application of force.
2. stretcher according to claim 1 is characterized in that,
Said elastic member contacts with said friction means with the contact diameter greater than the contact diameter of said the first axle part spare and said friction means.
3. according to claim 1 or the described stretcher of claim 2, it is characterized in that,
The surface of contact of said friction means and said the first axle part spare tilts with the axial mode of intersecting with said the first axle part spare.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007058827A JP4934816B2 (en) | 2007-03-08 | 2007-03-08 | Tensioner |
| JP058827/2007 | 2007-03-08 | ||
| PCT/JP2008/054095 WO2008108447A1 (en) | 2007-03-08 | 2008-03-06 | Tensioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101627227A CN101627227A (en) | 2010-01-13 |
| CN101627227B true CN101627227B (en) | 2012-10-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008800072591A Active CN101627227B (en) | 2007-03-08 | 2008-03-06 | Tensioner |
Country Status (3)
| Country | Link |
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| JP (1) | JP4934816B2 (en) |
| CN (1) | CN101627227B (en) |
| WO (1) | WO2008108447A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015159782A1 (en) * | 2014-04-14 | 2015-10-22 | 日本発條株式会社 | Tensioner |
| JP6948992B2 (en) * | 2018-08-01 | 2021-10-13 | 日本発條株式会社 | Tensioner |
| JP7128956B2 (en) * | 2019-03-28 | 2022-08-31 | 本田技研工業株式会社 | tensioner lifter |
| JP2022011785A (en) | 2020-06-30 | 2022-01-17 | 株式会社クボタ | Chain tensioner and tensioner releasing tool |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403725A (en) * | 2001-09-12 | 2003-03-19 | 本田技研工业株式会社 | Propulsive force giving apparatus for tension device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4448959B2 (en) * | 1999-07-09 | 2010-04-14 | 日本発條株式会社 | Tensioner |
| JP3962817B2 (en) * | 2001-12-18 | 2007-08-22 | 日本発条株式会社 | Tensioner |
| JP4461360B2 (en) * | 2003-12-22 | 2010-05-12 | 日本発條株式会社 | Tensioner |
-
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- 2007-03-08 JP JP2007058827A patent/JP4934816B2/en active Active
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2008
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403725A (en) * | 2001-09-12 | 2003-03-19 | 本田技研工业株式会社 | Propulsive force giving apparatus for tension device |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2001-21012A 2001.01.26 |
| JP特开2003-184968A 2003.07.03 |
| JP特开2005-180661A 2005.07.07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4934816B2 (en) | 2012-05-23 |
| JP2008223792A (en) | 2008-09-25 |
| WO2008108447A1 (en) | 2008-09-12 |
| CN101627227A (en) | 2010-01-13 |
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