CN109891127A

CN109891127A - Stretcher

Info

Publication number: CN109891127A
Application number: CN201780066226.3A
Authority: CN
Inventors: A·塞科; D·施奈德
Original assignee: Gates Corp
Current assignee: Gates Corp
Priority date: 2016-10-25
Filing date: 2017-10-23
Publication date: 2019-06-14
Also published as: BR112019008274A2; KR20190073491A; MX2019004688A; EP3532750A1; WO2018080970A1; AU2017350713A1; CA3039823A1; JP2019535971A

Abstract

A kind of stretcher comprising: pedestal；It is pivotally engaged to the first pivotal arm of pedestal；Axle journal is connected to the first pulley of the first pivotal arm；It is pivotally engaged to the second pivotal arm of pedestal；Axle journal is connected to the second belt wheel of the second pivotal arm；Flexible tension member carries out band indented joint with the first pivotal arm and carries out band indented joint with the second pivotal arm, and thus the first pivotal arm and the second pivotal arm move in a collaborative manner；And tensioner assembly, it is pivotally engaged to the pedestal and is engaged with flexible tension member.

Description

Stretcher

Technical field

The present invention relates to a kind of stretchers, and more particularly, to a kind of such stretcher, which has installation extremely The first pivotal arm and the second pivotal arm of pedestal；Flexible member, between first pivotal arm and second pivotal arm It is stowed, so that the pivotal arm moves in a collaborative manner；And it installs to the pedestal, the engagement flexible member Tensioner assembly.

Background technique

In the application of most of V belt translations, the ability appropriate with tension is maintained not make simultaneously for ensuring power transmission Band sliding is important.Minimum tension section in belt driver is commonly known as slack list section.Traditionally, stretcher is positioned at band The slack list section of transmission device is upper and its task is to maintain most small band tension appropriate in this paragraph.Use band direction of rotation as Benchmark, this section are to be located exactly at the belt wheel for providing power or the section after crankshaft in this case.For example, when crankshaft rotates When, slack list section will be that band has just left the section of crankshaft pulley and pilled-in selvedge section will be section close to crankshaft pulley.

It is utilized with alternator-starter (BAS:belt alternator starter) system and acts also as motor Alternating current generator.This is sometimes referred to as motor generator.The operation of BAS system is so that when the engine is running, alternative electric generation Owner will run in a conventional manner, and the common power provided by engine crankshaft belt wheel and loaded by alternating current generator of band logical It is loaded.In BAS system, transmission device is usually arranged to for alternating current generator to be positioned in band by under after crankshaft One attachment.In this arrangement, belt tightener should be between crankshaft pulley and alternating current generator.Use band direction of rotation As benchmark, stretcher is located just at before alternating current generator.

BAS system brings special problem to V belt translation.Alternating current generator had not only served as the load on belt driver, but also filled When the power supplying apparatus for belt driver.BAS system alternating current generator is used to start engine, and alternative electric generation Machine is used to provide power to engine.In starting example, alternator pulley becomes to be mentioned for the power of transmission device For device.The position of slack list section in transmission device is usually converted to the section after alternator pulley by this.In addition, pilled-in selvedge The present section between alternating current generator and crankshaft of section.Since traditional stretcher is designed to only maintain the pine of minimum level Side tension, so the present high-tension at tensioner position in band causes the extreme movements of stretcher.In addition, this feelings Condition to need the second stretcher in the position in new slack list section.

The conventional method for solving this problem is that there are two the belt drivers of stretcher for creation band.Second stretcher is logical It is often such stretcher, which has high-drag for the movement far from band.Second stretcher is usually expensive liquid Press stretcher.The arrangement of this two stretchers also needs the too long multiple stretchers brought in accommodating transmission device.This is logical Often result in expensive solution.

The prior art is represented as U.S. Patent No. 7,494,434, discloses a kind of accessory drive for engine Device, with suitable for driving engine and suitable for the starter generator of V belt translation driven by the engine.Exemplary In embodiment, transmission device includes the first driving engine belt wheel and the second starter drive pulley.Transmission belt couple drive Belt wheel is used for from another band one belt wheel of wheel drive.The biobelt stretcher for being made into prefabricated unit has bracket, the branch Frame has installation to the centrally-pivoted axle of engine and the first support arm and second support arm that radially extend from centrally-pivoted axle.Peace The first stretcher belt wheel is carried loaded on the first stretcher on the first arm, the first stretcher belt wheel is against neighbouring second transmission belt The first band (it is loose during engine start) of wheel operation carries out bias.The second stretcher band being carried on the second arm The second band (it is tight during engine start) taken turns against neighbouring second drive pulley operation carries out bias.It is connected to Two arms and be preferably contained in the hydraulic prop in prefabricated unit during normal power operation for second tensioning Device belt wheel provides the bias of appropriateness, and provides speed sensitive resistance for increased band power, which is starting The reaction campaign of the second stretcher belt wheel is limited during machine starting and transient engine operation.

What is desired is that a kind of stretcher, which includes the first pivotal arm and the second pivotal arm of installation to pedestal； Flexible member is stowed between first pivotal arm and second pivotal arm, so that the pivotal arm is to cooperate with Mode moves；And the tensioner assembly of the engagement flexible member to the pedestal is installed.The present invention meets the needs.

Summary of the invention

Main aspect of the invention is to provide a kind of stretcher, which includes the first pivotal arm of installation to pedestal With the second pivotal arm；Flexible member is stowed, so that described between first pivotal arm and second pivotal arm Pivotal arm moves in a collaborative manner；And the tensioner assembly of the engagement flexible member to the pedestal is installed.

By will point out other aspects of the invention to the following description of the present invention and attached drawing or of the invention its will be made Its aspect becomes apparent.

The present invention includes a kind of stretcher, which includes: pedestal；It is pivotally engaged to the first of the pedestal and pivots Arm；Axle journal is connected to the first pulley of first pivotal arm；It is pivotally engaged to the second pivotal arm of the pedestal；Axle journal connects It is connected to the second belt wheel of second pivotal arm；Flexible tension member, with first pivotal arm carry out band indented joint and Band indented joint is carried out with second pivotal arm, thus first pivotal arm and second pivotal arm are transported in a collaborative manner It is dynamic；And tensioner assembly, it is pivotally engaged to the pedestal and is engaged with the flexible tension member.

Detailed description of the invention

Comprising in the description and constituting the attached drawing of part of specification and showing the preferred embodiment of the present invention, and And it is used to illustrate the principle of the present invention together with specification.

Fig. 1 is the birds-eye perspective of device.

Fig. 2 is the cross-sectional view of device.

Fig. 3 is the exploded view of device.

Fig. 4 is the detail view of damper assembly.

Fig. 5 is the exploded view of the damper assembly in Fig. 4.

Fig. 6 is the detail view of damper assembly.

Fig. 7 is the exploded view of the damper assembly in Fig. 6.

Fig. 8 is the birds-eye perspective of synchronous tension device assembly.

Fig. 9 is the exploded view of the synchronous tension device assembly in Fig. 8.

Figure 10 is the exploded view of idler sheave assemblies.

Figure 11 is the exploded view of idler sheave assemblies.

Figure 12 A is the detail view of pivotal arm.

Figure 12 B is the detail view of pivotal arm.

Figure 13 A is the detail view of pivotal arm.

Figure 13 B is the detail view of pivotal arm.

Figure 14 is the birds-eye perspective of the inside of device.

Figure 15 is the detail view of the device in the operating position on engine.

Figure 16 shows the orientation that pivotal arm 5, pivotal arm 55 and hub are supported in release position.

Figure 17 A is the detail view of pivotal arm load condition.

Figure 17 B is the detail view of pivotal arm load condition.

Figure 18 shows the orientation that pivotal arm 5, pivotal arm 55 and hub are supported in alternating current generator starting mode position.

Figure 19 is the detail view of clutch spring.

Figure 20 is the detail view of clutch spring.

Figure 21 is the detail view of pedestal.

Figure 22 A shows the pivot arm position during mode of operation.

Figure 22 B shows the pivot arm position during mode of operation.

Figure 22 C shows the pivot arm position during mode of operation.

Figure 22 D shows the pivot arm position during mode of operation.

Figure 23 is the underneath side elevation view of the tensioner assembly in Fig. 8.

Figure 24 is the detail view of stretcher spring.

Figure 25 is the detail view of pedestal.

Figure 26 is to install to the rear portion detail view of the stretcher of alternating current generator.

Figure 27 is to install to the rear top detail view of the stretcher of alternating current generator.

Figure 28 is the bottom view of tensioner arms.

Figure 29 is the perspective view of the section 29-29 from Fig. 2.

Figure 30 is the perspective view of alternate embodiment.

Figure 31 is the plan view of the embodiment in Figure 30.

Figure 32 is the exploded view of the embodiment in Figure 30.

Figure 33 is the cross-sectional view of the embodiment in Figure 30.

Figure 34 is the side view of eccentric arm cam.

Figure 35 is the perspective view of the arm in Figure 34.

Figure 35 a is the perspective view of the arm in Figure 34.

Figure 36 is the perspective view of the arm in Figure 37.

Figure 36 a is the perspective view of the arm in Figure 37.

Figure 37 is the side view of eccentric arm cam.

Figure 38 is the side view of top eccentric arm.

Figure 39 is the perspective view of the arm in Figure 38.

Figure 40 is the side view of top eccentric arm.

Figure 41 is the perspective view of the arm in Figure 40.

Figure 42 is the cut-away side view of the embodiment in Figure 31.

Figure 43 is the detail view of idler sheave assemblies.

Figure 44 is the detail view of the damping mechanism for the embodiment in Figure 30.

Figure 45 is the damping mechanism for the embodiment in Figure 30.

Figure 46 is the cross-sectional view of the embodiment in Figure 31.

Figure 47 is the detail view of the pedestal of the embodiment in Figure 30.

Figure 48 is the detail view of the spring of the embodiment in Figure 30.

Figure 49 is the detail view of the spring of the embodiment in Figure 30.

Figure 50 is the plan view of the stretcher of the embodiment in Figure 30.

Figure 51 is the side view of the stretcher in Figure 50.

Figure 52 is the side view of the stretcher in Figure 50.

Figure 53 is the cross-sectional view of the stretcher in Figure 50.

Figure 54 is the exploded view of the stretcher in Figure 50.

Figure 55 is the detail view of the pedestal in Figure 47.

Figure 56 is the detail view of the pedestal in Figure 47.

Figure 57 is the detail view of the pedestal in Figure 47.

Specific embodiment

Fig. 1 is the birds-eye perspective of device.Stretcher 1000 of the invention includes respectively be pivotally mounted to pedestal 1 the One tensioner assembly 501 and the second tensioner assembly 502.

Fig. 2 is the cross-sectional view of device.Axis 2 and axis 22 extend from pedestal 1.By bushing 6, pivotally axle journal connects pivotal arm 5 To axis 2.The pivot axis of pivotal arm 5 and axis 2 are coaxial.By bushing 66, pivotally axle journal is connected to axis 22 to pivotal arm 55.It pivots The pivot axis of arm 55 and axis 22 are coaxial.Axis 2 and axis 22 be not coaxial.The pivot axis of arm 5 and the pivot axis of arm 55 be not coaxial.

Clutch spring 3 is engaged between damper assembly 4 and pedestal 1.Clutch spring 33 be engaged in damper assembly 44 with Between pedestal 1.Belt wheel 101 is connected to pivotal arm 55 by 102 axle journal of bearing.Belt wheel 10 is connected to pivot by 12 axle journal of bearing Arm 5.Clutch spring 3 and clutch spring 33 are used to starting damping function.

Lid 9 is held on pedestal 1 by fastener 14 and fastener 144.Arm 5 is held on pedestal 1 by retaining ring 7. Tensioner assembly 15 is held on pedestal 1 by lid 9.Lid 9 protects internal component from the influence of clast.

Fig. 3 is the exploded view of device.Washer 120 is set between retaining ring 7 and bushing 6.Washer 122 is set to retaining ring Between 77 and bushing 66.Arm 5 is pivoted around bushing 6 and bushing 661.Arm 55 is pivoted around bushing 660 and bushing 66.Fastener 13 Engagement arm 5.133 engagement arm 55 of fastener.

Fig. 4 is the detail view of damper assembly.Fig. 5 is the exploded view of the damper assembly in Fig. 4.Damper assembly 4 includes damping Watts 41 and damping ring 42.Damping ring 42 and damping watt 41 are coaxial.Damping ring 42 is the cylinder in axial direction having gap 421 Shape.Damping ring 42 has inwardly projecting multiple lugs 420 and 430 for accommodating damping watt 41.Damping watt 41 is along axis The cylindrical in gap 410 is had to direction.The outer surface 422 of damping ring 42 frictionally engages the inner surface 51 of pivotal arm 5.

Fig. 6 is the detail view of damper assembly.Fig. 7 is the exploded view of the damper assembly in Fig. 6.Damper assembly 44 includes damping Watts 441 and damping ring 442.Damping ring 442 and damping watt 441 are coaxial.Damping ring 442 is with the gap 4440 axially extended Cylindrical.Damping ring 442 has the inwardly projecting multiple lugs 4420 and lug for accommodating damping watt 441 4430.Damping watt 441 is the cylindrical with the gap 4410 axially extended.It rubs the outer surface 4421 of damping ring 442 Wipe the inner surface 551 of ground engagement pivotal arm 55.

Fig. 8 is the birds-eye perspective of tensioner assembly.Fig. 9 is the exploded view of the tensioner assembly in Fig. 8.Synchronous tension device Component 15 includes rotatable band guiding piece 151, fastener 152, arm 153 and spring 154.Band guiding piece 151 passes through axis 155 Axle journal is connected to arm 153.Hole 1532 in 155 engagement arm 153 of axis.Arm 153 is pivotally attached to pedestal 1 by fastener 152. Spring 154 is securely attached to arm 153 by lug 1530 and lug 1531, and referring to fig. 28.Spring 154 serve as biasing member with Apply torque to arm 153, load is then applied to band 8 by the arm.Figure 23 is the underneath side elevation view of the tensioner assembly in Fig. 8. Figure 24 is the detail view of stretcher spring.Figure 25 is the detail view of pedestal.Spring end 1540 is engaged in the lug in pedestal 1 Between 912 and lug 913, this prevents the rotation in load of spring 154, referring to fig. 21 and Figure 25.

Axis 2 is securely attached to pedestal 1.Clutch spring 3 is securely attached to pedestal 1, the tang by tang 31 The slit 911 of engaging base 1, referring to Figure 19 and Figure 21.Pivotal arm 5, bushing 6 and 661 through hole of bushing, 54 axle journal are connected to axis 2.Washer 120 and axis 2 are coaxial.Retaining ring 7 is fixedly located on axis 2 in slot 21.Damper assembly 4 and pivotal arm 5 are coaxial.

Axis 22 is securely attached to pedestal 1.Clutch spring 33 is attached to pedestal 1, the tang engagement by tang 331 Slit 910, referring to fig. 20 and Figure 21.Pivotal arm 55, bushing 66 and 660 through hole 554 of bushing are pivotally attached to axis 22.Washer 122 is coaxial with axis 22.Retaining ring 77 is fixedly located on axis 22 in slot 221.Arm 5 is held on axis 2 by retaining ring 7.It keeps Ring 7 is fixedly located on axis 2 in slot 21.Arm 55 is held on axis 22 by retaining ring 77.Damper assembly 44 and pivotal arm 55 are same Axis.Damper assembly 44 frictionally engages pivotal arm damping surfaces 551.

Figure 10 is the detail view of idler sheave assemblies.Figure 11 is the detail view of idler sheave assemblies.10 axle journal of belt wheel is connected to bearing 12. Axle journal is connected to pivotal arm 5 to bearing 12 on surface 53.101 axle journal of belt wheel is connected to bearing 102.Bearing 102 is on surface 553 Axle journal is connected to pivotal arm 55.

Figure 12 A is the detail view of pivotal arm.Figure 12 B is the detail view of pivotal arm.Figure 13 A is the detail view of pivotal arm.Figure 13B is the detail view of pivotal arm.53 receiving bearing 12 of pivotal arm axle bearing mount surface and, difference not coaxial with pivot arm aperture 54 Referring to pivot axis (A) and bearing axis (B).553 receiving bearing 102 of pivotal arm axle bearing mount surface and with pivot arm aperture 554 is coaxial.Hole 54 engages axis 2, and the axis 2 receives fastener 13.Hole 554 engages axis 22, and the axis 22 receives fastener 133。

Pivotal arm 5 is pivoted around pivot axis (A).Bearing 12 is rotated around bearing axis (B).Bearing axis (B) and pivot Shaft axis (A) is not coaxial, but is offset from one another distance (X).

Pivotal arm 55 is pivoted around pivot axis (A2).Bearing 102 is rotated around bearing axis (B2).Bearing axis (B2) It is not coaxial with pivot axis (A2), but it is offset from one another distance (Y).

The sprocket 52 and sprocket 552 on pivotal arm 5 and pivotal arm 55 respectively is engaged with 8.Band 8 can with teeth, But it also may include any flexible member suitable for supporting tension load.Sprocket 52 and sprocket 552 respectively come with tooth with Just energetically bonding ribbon 8.

Figure 14 is the birds-eye perspective of the inside of device.Band 8 engages tensioner assembly 15.With all in 8 and band 200 Tension load is applied by tensioner assembly 15.The rotation of pivotal arm 5 causes the movement of band 8, this then cause pivotal arm 55 along with The identical direction of rotation of pivotal arm 5 is moved in a manner of synchronous or collaboration.The rotation of pivotal arm 55 causes the movement of band 8, this Then pivotal arm 5 is caused to move in a manner of synchronous or collaboration along with the identical direction of rotation of pivotal arm 55.Therefore, it is operating In, pivotal arm 5 and pivotal arm 55 are substantially simultaneously moved by the effect of band 8.

" synchronization " movement can be described as: the movement of pivotal arm 5 and pivotal arm 55, wherein each pivotal arm is with substantially phase Same time rotation passes through roughly the same angle." collaboration " movement can be described as: the fortune of pivotal arm 5 and pivotal arm 55 It is dynamic, wherein each pivotal arm is not rotated with roughly the same time rotation but for two pivotal arms by identical Angle.The rotation by different angle that can cause pivotal arm by such as stretching, extension of band 8, as solved herein As releasing, referring to fig. 22.

Figure 15 is the detail view of the device in the operating position on engine.In typical asynchronous accessory tapes power train It unites in (ABDS), the device of the invention 1000 is arranged to as shown in Figure 15.Stretcher 1000 is pacified using fastener 13 and 133 It is filled to alternating current generator 203.Band 200 surrounds crankshaft pulley 201, alternator pulley 202 and stretcher belt wheel 10 and band 101 are taken turns to determine path.The arrangement will be set on the two sides of alternator pulley 202 with section.Pass through stretcher 1000 The position of operation and belt wheel 10 and belt wheel 101 maintains the tension in band 200.Band 200 is usually known in the art more ribs Band, that is, it include along longitudinal direction or circumferential direction extend multiple ribs.

The position of pivotal arm 5 and therefore the position of belt wheel 10 is controlled by band 8.The position of pivotal arm 55 and therefore belt wheel 101 position is also controlled by band 8.With the tension in 8 by the position control of belt wheel 10 and belt wheel 101.With the tension in 8 by being tensioned Device assembly 15 maintains.Section with 8 engagement tensioner assembly 15 is the pilled-in selvedge section of band 8.Remaining section 81 with 8 does not need any Tightly.It is produced on pivotal arm 5 and pivotal arm 55 respectively with the tension in 8 by the engagement of it and sprocket 52 and sprocket 552 Raw torque.

Figure 16 shows pivotal arm 5 and pivotal arm 55 and hub is supported on the orientation in " loosening " position.Work as engine accessory power rating When transmission device is in release position, tension in band 200 is balanced entirely taking.Tension with 200 is in this shape It is initial belt tension under state, and the initial belt tension is generated by stretcher of the invention.Due to tension (described in band 8 Power is caused by the tensioner assembly 15 being supported on band 8) torque caused on pivotal arm 5 and pivotal arm 55,5 He of pivotal arm Pivotal arm 55 is respectively pushed to rotate into band 200.Pivotal arm 5 and pivotal arm 55 is caused to rotate with the tension in 8, until turning round Square with come carry 200 hub load caused by torque it is equally opposite.Hub load with 200 passes through bearing 12 and bearing respectively 102 central axis and work relative to pivotal arm 5 and pivotal arm 55.Direction based on the load on corresponding arm and have Arm lengths are imitated, this causes to cause torque on each pivotal arm 5 and pivotal arm 55.Each pivotal arm 5 and pivotal arm 55 will rotate, Until hub load torque and moment of torsion of band 8 on corresponding pivotal arm 5 and pivotal arm 55 etc. and on the contrary.

Come carry 8, the length of moment arm that act on pivotal arm 5 be equal to sprocket 52 pitch diameter 1/2 (for example, 26.3mm).The length of moment arm that hub to carry 200 loads, acting on pivotal arm 5 is equal to arm lengths multiplied by power to pivot The sine value of the angle of arm 5 is referred to as effective rake degree.Figure 17 A is the detail view of pivotal arm load condition.Figure 17 B is pivot The detail view of pivoted arm load condition.

With 8 the moment arm for acting on pivotal arm 55 length be equal to sprocket 552 pitch diameter 1/2 (for example, 26.3mm).The length of moment arm that hub to carry 200 loads, acting on pivotal arm 55 is equal to arm lengths multiplied by power to pivot The sine value of the angle of pivoted arm 55 is also referred to as effective rake degree.

In belt driver, when the windup-degree around belt wheel of band is 60 degree, as caused by the tension in band Hub load is approximately equal to the tension in band.For example, if the tension in each of band section is 100N, when windup-degree is 60 degree When, the hub load on pivotal arm 5 will be equal to 100N.

In pivotal arm 5 therefore generated torque is hub load 100N multiplied by effective rake degree.If effective rake degree is 7mm, then on pivotal arm 5, come loose boss load torque be 100N × 0.007m=0.70Nm.

It will therefore need with the tension in 8 for 0.7Nm/0.0263m=26.6N, so as on pivotal arm 5 and pivotal arm 55 Generate equal and opposite torque.

As can be seen that from previous example, it is only necessary to the big of the slack list tension for band 200 for the tension in band 8 About 1/4.This is effective rake degree and the ratio between sprocket 52 and the radius of sprocket 552.

Figure 18 shows the orientation that pivotal arm 5, pivotal arm 55 and hub are supported in alternating current generator starting mode position.? During alternating current generator replaces starting condition of the crankshaft as the driving device belt wheel in system, the upper segment (C) in Figure 18 becomes For slack list section, lower bands section (D) becomes pilled-in selvedge section.If alternating current generator is for the torque of starting condition supply 60Nm, pilled-in selvedge Tension must raise to the level that can support the power transmission of this level.During starting condition, pass through the increasing in band 200 The tension added come push lower pivot arm 55 rotate.It is risen to the tension in 200 and is enough to make engine to start rotation (that is, driving Dynamic crankshaft) level.

In belt driver, it is referred to as warp tension ratio around the pilled-in selvedge tension of belt wheel and the ratio of slack list tension.In order to Band function appropriate is maintained in ABDS transmission device, about 5 warp tension ratio is necessary.

For needing to be generated needed for 60Nm torque by the starting condition of alternating current generator supply 60Nm torque around exchange The tension difference of generator belt wheel are as follows:

Torque=r* Δ T=r (T2-T1) (equation 1)

Wherein T2=pilled-in selvedge tension

The slack list T1=tension

R=belt wheel radius=0.030m

Solve Δ T:

Δ T=torque/r=60/0.030=2000N

It is known that in order to maintain ABDS function appropriate, slack list tension must make warp tension ratio be 5.So:

T2/T1=5 (equation 2)

It is known that

Δ T=T2-T1 (equation 3)

Solve the T2 in equation 3

T2=Δ T+ Τ 1

It is updated in equation 2 and solves T1

(Δ T+T1)/T1=5

Δ T+ Τ 1=5T1

Δ T=4T1

Δ T/4=T1

2000/4=T1

T1=500N

Return is updated in equation 2

T2/T1=5

T2/500=5

T2=2500N

During starting condition, the high-tension in pilled-in selvedge section (T2) (referring to (D) of Figure 18) to act on pivotal arm 55 On hub load generate torque, the torque make arm rotate to wherein arm direction substantially with the parallel position in direction of hub load It sets, referring to Figure 18.This has the effect of temporarily for tensioner assembly 502 being converted into fixed idle pulley.Tensioner assembly 502 The rotation amount of pivotal arm 55 is about 65 degree.

Pivotal arm 5 and pivotal arm 55 be arranged such that when each pivotal arm is rotated towards band 200, belt wheel 10 and belt wheel 101 are greater than the movement when each pivotal arm is rotated far from band 200 in the movement that each swing is respectively facing band 200.This is wanted The rotation angle of slack list tensioner assembly 501 is asked to be less than the angle that pilled-in selvedge tensioner assembly 502 is moved, to remain identical Strip length.Table 1 shows the rotation amount of each pivotal arm 5 and pivotal arm 55 during the starting condition of no band stretching, extension.

Table 1

Since band 200 is stretched because of load, so slack list pivotal arm 5 must be compensated for the stretching, extension.Assuming that since load is drawn The amount with stretching, extension risen is 3mm, then slack list stretcher must rotate additional 30 degree to occupy the additional strip length.Table 2 The rotation amount of each pivotal arm 5 and pivotal arm 55 during starting condition is shown, and includes to consider the information with stretching, extension.

Table 2

As can see in table 2, slack list tensioner pivot arm 5 must rotate additional 30 degree to consider band 200 Stretching, extension.Figure 22 A shows the pivot arm position during mode of operation.Figure 22 B shows the pivotal arm during mode of operation Position.Figure 22 C shows the pivot arm position during mode of operation.Figure 22 D shows the pivotal arm during mode of operation Position.

In addition, the effective rake degree for being arranged such that slack list pivotal arm 5 moves towards band 200 with it and is reduced.Effectively The shape that this reduction of arm lengths enables the device of the invention to increase slack list tension and therefore starts in such as alternating current generator Increase the tension of entire band 200 during condition.Can be realized this point is because the tension in band 8 is via tensioner assembly 15 Control.Tensioner assembly 15 causes torque on pivotal arm 5, which must load with the hub of band 200 on the contrary, such as previous institute As description.Its effective rake degree is reduced to 4.2mm from 7mm by 55 degree of rotation of slack list pivotal arm 5.

Since tensioner assembly 15 controls the tension in band 8 and so that the tension in band 200 is controlled, so the stretcher Component controls the torque in pivotal arm 5.The rotation angle of pivotal arm 5 is 10 degree smaller than the rotation angle of pivotal arm 55.This is effectively The section for acting on tensioner assembly 15 of shortened belt 8, so as to cause the rotation of tensioner assembly 15.The rotation of tensioner assembly 15 So that the tension in band 8 increases.The torque on pivotal arm 5 and pivotal arm 55 is increased with the increased tension in 8.In pivotal arm 5 and pivotal arm 55 on generate opposite torques hub load force must increase so as to reach balance.

In order to calculate the tension on band 200 (tension is approximately equal to hub load as indicated previously), simply by pivot 8 torque is carried divided by new effective rake degree on pivoted arm 5.It is 81N with the new tension in 8.Coming from pivotal arm 5 Torque with 8 is 2.13Nm.It is 2.13Nm/0.0042m=507N with the tension in 200.The tension is higher than previously calculated Minimum slack list tension (T1) and generate whole band tension appropriate.The ability of the increase slack list tension of the device of the invention has Sharp place is that allow to reduce whole initial tension, this is beneficial to tape lifetime and attachment service life.

Therefore, for the starting condition of 60Nm, assembly of the invention provides the slack list tension of minimum 500N.For 60Nm's Regenerative braking situation, assembly of the invention provides the slack list tension of minimum 500N.For immunization with gD DNA vaccine, the device of the invention is mentioned For the reduced slack list tension of 100N.For the medium load situation of the alternator load of such as 20Nm, dress of the invention It sets and the necessary slack list tension of 167N is provided.

Note that all numerical value as used in this specification merely for the sake of the example of task of explanation, and not purport It is limiting the scope of the invention.

Damping tape vibration is also the critical function of stretcher.Most commonly by generation for the fortune in tensioner pivot arm Dynamic resistance damps to realize.It has been generally acknowledged that being advantageous in ABDS stretcher with asymmetric damping.Asymmetric damping is Such state, in this state, for tensioner arms movement resistance according to the direction of the movement of tensioner pivot arm and It is different.

Figure 19 is the detail view of clutch spring.Figure 20 is the detail view of clutch spring.Pass through damper assembly 4 and clutch The interaction of device spring 3 and pivotal arm 5, and the phase interaction by damper assembly 44 and clutch spring 33 and pivotal arm 55 With generating the damping in stretcher of the invention.Clutch spring 3 is dextrorotation winding and clutch spring 33 is left-handed twines Around.Clutch spring 3 is bonded in slit 911 by tang 31 and is attached to pedestal 1.Clutch spring 33 passes through tang 331 It is bonded in slit 910 and is attached to pedestal 1, referring to fig. 21.Figure 21 is the detail view of pedestal.

Clutch spring 3 serves as the one-way clutch against damper assembly 4.Clutch spring 3 limits damper assembly 4, with So that the damper assembly only rotates freely through on the direction that pivotal arm 5 is rotated towards band 200.Damper assembly 4 is configured to So that damping watt 41 generates outside pressure on damping ring 42, which is then pushed outwards the resistance moved into pivotal arm 5 Buddhist nun surface 51 contacts.Normal force caused by the outside pressure is combined with coefficient of friction of the damping ring 42 on pivotal arm 5, To generate the frictional force for resisting the movement between damper assembly 4 and pivotal arm 5.When rotating damper assembly 4, frictional force is just So that damper assembly 4 pushes pivotal arm 5 to rotate.

Clutch spring 33 serves as the one-way clutch against damper assembly 44.Clutch spring 33 limits damper assembly 44, so that the damper assembly only rotates freely through on the direction that pivotal arm 55 is rotated towards band 200.44 quilt of damper assembly It is configured so that damping watt 441 generates outside pressure on damping ring 442, which, which is then pushed outwards, moves into and pivot The damping surfaces 551 of arm 55 contact.Normal force caused by the outside pressure and friction of the damping ring 442 on pivotal arm 55 Coefficient combines, to generate the frictional force for resisting the movement between damper assembly 44 and pivotal arm 55.Whenever damper assembly 44 When rotation, frictional force allows for damper assembly 44 and pivotal arm 55 is caused to rotate.

During the vehicle operating that the pilled-in selvedge section of band 200 is engaged with tensioner assembly 15, as the tension of band 200 increases, The torque that hub load is applied on pivotal arm 5 increases, so that pivotal arm 5 is pivoted away from band 200.In being somebody's turn to do far from band 200 During movement, clutch spring 3 is locked against damper assembly 4, this eliminates the ability that damping ring 4 rotates together with pivotal arm 5, from And stop the rotation of pivotal arm 5.Therefore pivotal arm 5 only can be more than come self-damping by the caused torque of increased hub load It is just rotated after the resistance of component 4.In addition, the tension decline and corresponding pivotal arm 55 in the slack list section of band 200 move to In band 200.Due to the clutch release of clutch spring 33 in this direction of rotation, pivotal arm 55 is rotated freely through, from And maintain suitable slack list section band tension.

In pilled-in selvedge section against during the vehicle operating of tensioner assembly 502, as the tension of band 200 increases, hub load is applied The torque being added on pivotal arm 55 increases, so that arm is pivoted away from band 200.During the movement far from band 200, clutch Device spring 33 is resisted damper assembly 44 and is locked, this eliminates the ability that damper assembly 44 rotates together with pivotal arm 55, to stop Pivotal arm 55.Pivotal arm 55 only can be more than the resistance from damper assembly 44 by the caused torque of increased hub load It just rotates later.In addition, the tension decline and corresponding pivotal arm 5 in the slack list section of band 200 move in band 200.Due to The clutch of clutch spring 3 discharges pivotal arm 5 in this direction of rotation, therefore pivotal arm 5 rotates freely through, thus in band Suitable slack list section band tension is maintained in 200.

The rotational resistance of the pivotal arm 5 as caused by the damper assembly 4 to work with clutch spring 3 is in one direction Generate the resistance of motion bigger than other direction.For rotation the unequal resistance generated in tensioner assembly 501 it is not right Claim damping.

The rotational resistance of the pivotal arm 55 as caused by the damper assembly 44 to work with clutch spring 33 is along one Direction generates the resistance of motion bigger than other direction.This unequal resistance for rotation produces in tensioner assembly 502 Raw asymmetric damping.

BAS system is also run in the normal mode, in the normal mode, such as when alternating current generator generates electric power, Alternating current generator loads crankshaft pulley by band 200.

BAS system is also with such mode operation, and in this mode, alternating current generator is used to load crankshaft high-intensitively Belt wheel simultaneously then assists vehicle braking, is also referred to as regenerative braking.In regenerative braking situation, to the load of band with exist above It is opposite described in alternating current generator starting condition.In this case, the function of just handing off stretcher of the invention, makes The pilled-in selvedge section for obtaining band 200 is supported on tensioner assembly 501, and the slack list section of band 200 is supported on tensioner assembly 502.

Other embodiment include, but are not limited to, and sprocket 52 and sprocket 552 respectively have either alone or in combination Non-circular shape.Each sprocket 52 and sprocket 552 can be different from the pivot axis of pivotal arm 5 and pivotal arm 55 respectively Axis.Sprocket 52 and sprocket 552 can be eccentric relative to pivotal arm 5 and pivotal arm 55, and the sprocket respectively can be with It is respectively provided with different offsets.Pivotal arm 5 can have the eccentric excursions different from pivotal arm 55.Sprocket 52 and sprocket 552 can have different diameters.Band 8 is necessarily ring-shaped multiple evenly spaced teeth, that is, band 8 can have wherein not There are the ends of section 81.Band 8 is necessarily ring-shaped multiple evenly spaced teeth, but only need with sprocket 52 and chain Band is with teeth at the contact interface of the gear teeth 552.Band 8 can be flexible annular component, for example can carry the flat of tension load Band, band, rope or hawser.It can be the rigid rod being articulated near tensioner assembly 15 with 8.It can be by showing as the section of band 8 with 8 81 compressible member replaces.

Figure 26 is to install to the rear portion detail view of the stretcher of alternating current generator.Use fastener 13 and fastener 133 Stretcher 1000 is attached to alternating current generator 203.

Figure 27 is to install to the rear portion top detail view of the stretcher of alternating current generator.

Figure 28 is the bottom view of tensioner arms.The end 1541 of spring 154 is engaged in the lug 1530 on pivotal arm 153 Between lug 1531.

Figure 29 is the perspective view of the section 29-29 in Fig. 2.Damper assembly 4 frictionally engages the surface 51 of pivotal arm 5.Resistance Buddhist nun's component 44 frictionally engages the surface 551 of pivotal arm 55.Clutch spring 3 frictionally engages damping watt 41.Clutch spring 33 frictionally engage damping watt 441.Clutch spring 3 and clutch spring 33 are respectively loaded along unreeling direction, it means that The diameter of each clutch spring expands with the increase of the load applied.The expansion of clutch spring 3 will damp watt 41 pressures It leans against on damping ring 42, which is then pressed against on surface 51, this is slowed or shut off the rotation of pivotal arm 5.Clutch Damping watt 441 is pressed against on damping ring 442 by the expansion of spring 33, which is then pressed against on surface 551, this subtracts Rotation that is slow or stopping pivotal arm 55.

For example, clutch spring 3 will be loaded along coiling direction, and therefore will not if band 8 is moved along direction (M1) The rotation of pivotal arm 5 can be resisted.However, clutch spring 33 will be loaded along unreeling direction, and therefore damper assembly 44 will Resist the rotation of pivotal arm 55.

If band 8 is moved along direction (M2), clutch spring 3 will be loaded along unreeling direction, and therefore will resist pivot The rotation of pivoted arm 5.However, clutch spring 33 will be loaded along coiling direction, and therefore damper assembly 44 will not be resisted The rotation of pivotal arm 55.

The direction of motion regardless of band 8, tensioner assembly 15 will maintain the load in band 8.No matter the movement side of band 200 To how, tensioner assembly 15 will maintain the load in band 200 by each pivotal arm 5 and pivotal arm 55.

Figure 30 is the perspective view of alternate embodiment.Alternate embodiment includes the idle pulley being respectively pivotally engaged with pedestal 300 Component 100 and idler sheave assemblies 200.Tensioner assembly 340 is pivotally mounted to pedestal 300.Tensioning is adjusted using adjuster 35 The position of device assembly 340.Each idler sheave assemblies 100,200 are prejudicially pivoted around its respective pivot axis.Idle pulley group The pivot axis of part 100 is column 3310.The pivot axis of idler sheave assemblies 200 is column 3315, referring to fig. 47.

Figure 31 is the plan view of the embodiment in Figure 30.

Figure 32 is the exploded view of the embodiment in Figure 30.Regulator member 35 adjusts load, and stretcher 340 passes through described negative Carry bonding ribbon 315.Each corresponding idler sheave assemblies 100,200 are held in its suitable position by each retainer 355.Damping Mechanism 140 is set between component 100 and pedestal 300.Damping mechanism 240 is set between component 200 and pedestal 300.Torsion Spring 320,360 is engaged between each corresponding idler sheave assemblies 100,200 and pedestal 300.Each spring 320,360, which serves as, to be connect Close the one-way clutch of damping mechanism 140,240 and pedestal 300.

Bushing 368 is engaged between each retainer 355 and component 100 and 200.Fastener 18,19,20,25 and 30 will Lid 375 is attached to pedestal 300.Bushing 370 is engaged between pedestal 300 and each component 100,200.

Flexible member 315 does not include ring segment, which means that it is with discrete end.Each end part of component 315 It is not attached to lower eccentric arm 130,230.

Figure 33 is the cross-sectional view of the embodiment in Figure 31.Eccentric idler sheave assemblies 100 include top eccentric arm 110, fastener 115, idler sheave assemblies 120, dust cover 125, lower eccentric arm 130, spring 320 and damping mechanism 140.Fastener 115 will be upper Portion's arm 110 is connected to lower arm 130.Bushing 368 engages upper arm 110.Bushing 370 engages lower arm 130.

Idler sheave assemblies 120 and dust cover 125 and eccentric axis 1320 are coaxial.Damping mechanism 140 and pivot axis 1310 are same Axis.Eccentric axis 1120 and eccentric axis 1320 are coaxial.Pivot axis 1110 and pivot axis 1310 are coaxial.

Figure 34 is the side view of eccentric arm cam.Idler sheave assemblies include lower eccentric arm 130.Arm 130 includes pivot axis 1310, eccentric axis 1320, toothed portion divide 1340, cam portion 1350 and tang 1360.Eccentric axis 1320 and pivotal axis Line 1310 is not coaxial, but offset distance 1330.Part 1370 engages bearing 121.The radius R1 of toothed portion point 1340 is less than convex Take turns the radius R2 of part 1350.When arm 130 pivots, band 315 is gradually engaged with cam portion 1350.

Figure 35 is the perspective view of the arm in Figure 34.Arm 130 includes tang 1360.Utilize the one of 1360 capture zone 315 of tang A end.Threaded hole 1380 receives fastener 115.

Figure 36 is the perspective view of the arm in Figure 37.Lower arm 230 includes tang 2360.With 315 another end and handle Foot 2360 engages.Part 2370 engages bearing 221.Threaded hole 2380 receives fastener 215.

Figure 37 is the side view of eccentric arm cam.Idler sheave assemblies include lower eccentric arm 230.Arm 230 includes pivot axis 2310, eccentric axis 2320, toothed portion divide 2340, cam portion 2350 and tang 2360.Eccentric axis 2320 and pivotal axis Line 2310 is not coaxial, but offset distance 2330.The radius R1 of toothed portion point 2340 is less than the radius R2 of cam portion 2350.When When arm 230 pivots, band 315 is gradually engaged with cam portion 2350.

Figure 38 is the side view of top eccentric arm.Top eccentric arm 110 includes pivot axis 1110 and eccentric axis 1120.Axis 1110 and 1120 is not coaxial, but offset distance 1130.Part 1140 is pivotally engaged guarantor by bushing 368 Holder 355.

Figure 39 is the perspective view of the arm in Figure 38.Groove 1150 receives fastener 115.

Figure 40 is the side view of top eccentric arm.Top eccentric arm 210 includes pivot axis 2110 and eccentric axis 2120.Axis 2110 and 2120 is not coaxial and offset distance 2130.Part 2140 is pivotally engaged holding by bushing 368 Device 355.

Figure 41 is the perspective view of the arm in Figure 40.Groove 2150 receives fastener 215.

Figure 42 is the sectional view of the embodiment in Figure 31.Eccentric idler sheave assemblies 200 include top eccentric arm 210, fastening Part 215, idler sheave assemblies 220, dust cover 225, lower eccentric arm 230, damping mechanism 240 and spring 360.Fastener 215 will Arm 210 is connected to arm 230.Upper arm 210 passes through 368 splice holder 355 of bushing.

Idler sheave assemblies 220 and dust cover 225 and eccentric axis 2320 are coaxial.Damping mechanism 240 and pivot axis 2310 are same Axis.Eccentric axis 2120 and eccentric axis 2320 are coaxial.Pivot axis 2110 and pivot axis 2310 are coaxial.

Figure 43 is the detail view of idler sheave assemblies.Idler sheave assemblies 120 include bearing 121 and idle pulley 122.Idler sheave assemblies 220 Including bearing 221 and idle pulley 222.Idler sheave assemblies 120 and 220 are identical in form and function.

Figure 44 is the detail view of the damping mechanism for the embodiment in Figure 30.Damping mechanism 140 include transmitting ring 141, Damping watt 142 and damping ring 143.Transmit ring 141 be cylinder, with inner surface 1410, slit 1411, face 1412 and Face 1413, referring to fig. 45.Damping watt 142 is cylinder, with axially extending gap 1425 and axially projecting lug 1424.Lug 1424 includes the face 1422 opposite with face 1423.Damping ring 143 is cylinder, with axially extending gap 1430.Damping ring 143 and damping watt 142 and transmitting ring 141 are coaxial.Face 1413 and face 1423 are opposite.Face 1412 and face 1422 Relatively.

1410 frictional engagement spring 320 of face.The outside 1431 frictional engagement lower eccentric arm 130 of surface of damping ring 143 Inside surface 1390, referring to Figure 35 a.Damping watt 142 is worked in spring-like manner, pushes outer surface 1441 outside Against inner surface 1442, to push surface 1431 out against surface 1390.Outside spring force is produced for that will hinder Buddhist nun mechanism 140 is frictionally engaged to the normal force of arm 142.When the rotation of arm 142 is into band 200,320 clutch of spring is simultaneously detached from damping Mechanism 140.Arm 142 is freely rotated towards band 200.When arm 142 is pivoted away from band 200, the outer surface of spring 320 is along unwinding Direction radially expands, to clutch and engage the surface 1410 of damping mechanism 140.Pass through rubbing for damping mechanism 140 and arm 142 Engagement is wiped to resist the rotation of arm 142.

Damping mechanism 240 is identical as damping mechanism 140 in form and function.It is indicated in bracket for hindering in Figure 44 The corresponding number of Buddhist nun mechanism 240.Transmitting ring 241 is cylindrical, with inner surface 2410, slit 2411, face 2412 and face 2413.Damping watt 242 is cylindrical, with axially extending gap and axially projecting lug 2424.Lug 2424 has the face 2422 opposite with face 2423.Damping ring 243 is cylindrical, with axially extending Gap.Damping mechanism 240 includes transmitting ring 241, damping watt 242 and damping ring 243.Damping ring 243 and damping watts 242 with It is coaxial to transmit ring 241, face 2413 and face 2423 are opposite.Face 2412 and face 2422 are opposite.

2410 frictional engagement spring 360 of face.The outside surface 2431 of damping ring 243 frictionally engages lower eccentric arm 230 surface 2390, referring to Figure 36 a.Damping watt 242 is worked in spring-like manner, and outer surface 2441 is pushed to support outward By inner surface 2442, to push surface 2431 out against surface 2390.Outside spring force, which generates, is used for damping mechanism 240 It is frictionally engaged to the normal force of arm 242.When the rotation of arm 242 is into band 200,360 clutch of spring is simultaneously detached from damping mechanism 240. Arm 242 is freely rotated towards band 200.When arm 142 is pivoted away from band 200, the outer surface of spring 360 along unreeling direction radially Expand, to clutch and engage the surface 2410 of damping mechanism 240.It is supported by the frictional engagement of damping mechanism 240 and arm 242 The rotation of anti-arm 242.

Figure 45 is the damping mechanism for the embodiment in Figure 30.

Figure 46 is the cross-sectional view of the embodiment in Figure 31.Base assembly 300 includes retainer 355, receiver 310, band 315, spring 320, bushing 370, pedestal 330, spring 360, lid 375, idle pulley 335, idle pulley 345 and tensioner assembly 340.Band 315 be toothed belt or synchronous belt.The sprocket 1340 and sprocket 2340 for engaging each arm 130 and 230 respectively with 315.Band 315 Sprocket 1340 is attached to by tang 1360.Band 315 is attached to sprocket 2340 by tang 2360.Each 335 He of idle pulley 345 have the smooth surface of the back side for bonding ribbon 315.

The arm 3200 of spring 320 is held in cavity 3320.The arm 3600 of spring 360 is held in cavity 3325.Tensioning Device assembly 340 is pivotally attached to column 3345 by fastener 20.Lid 375 is attached to pedestal by fastener 30 and fastener 25 300。

Figure 47 is the detail view of the pedestal of the embodiment in Figure 30.Pedestal 300 includes cylindrical pillars 3310, cylindrical pillars 3315, cylindrical pillars 3330, cylindrical pillars 3335, cylindrical pillars 3345, receiver 3340, cavity 3320 and cavity 3325. 3320 receiving arm 3200 of cavity.3325 receiving arm 3600 of cavity.

335 axle journal of idle pulley is connected to column 3330.345 axle journal of idle pulley is connected to column 3335.Bushing 325 and column 3310 are coaxial. Bushing 370 and column 3315 are coaxial.Pivot axis 1310 and column 3310 are coaxial.Pivot axis 2310 and column 3315 are coaxial.Adjuster 35 engaging receiver devices 3340.

Figure 48 is the detail view of the spring of the embodiment in Figure 30.Spring 320 includes arm 3200 at one end.Arm 3200 engagement cavitys 3320, thus anchor arm 3200.

Figure 49 is the detail view of the spring of the embodiment in Figure 30.Spring 360 includes arm 3600 at one end.Arm 3600 engagement cavitys 3325, thus anchor arm 3600.

Figure 50 is the plan view of the stretcher of the embodiment in Figure 30.20 engaging hole 3471 of fastener.

Figure 51 is the side view of the stretcher in Figure 50.

Figure 52 is the side view of the stretcher in Figure 50.Each pin 3510 and 3511 is supported on pedestal 300 and will open Tight device 340 is positioned in pedestal 300.Pin 3510 and 3511 is that idle pulley 3500 provides gap.

Figure 53 is the cross-sectional view of the stretcher in Figure 50.Tensioner assembly 340 includes lid 3410, pivot pin 3420, bushing 3430, torque spring 3440, bushing 3450, arm 3460, pedestal 3470, pin 3480, bushing 3490 and idle pulley 3500.Bushing 3430 and bushing 3450 and arm 3460 it is coaxial.Spring 3440 it is coaxial with arm 3460 and be engaged in arm 3460 and lid 3410 it Between.Pivot pin 3420 is coaxial with arm 3460 and is securely attached to pedestal 3470.Pin 3480 is coaxial with bushing 3490 and solid Surely it is attached to arm 3460.Idle pulley 3500 and bushing 3490 are coaxial.Tensioner assembly 340 is being typically found in automobile and industry is answered It is known in the field of automatic belt tightener in.

Figure 54 is the exploded view of the stretcher in Figure 50.3471 bond post 3345 of hole.

Figure 55 is the detail view of the pedestal in Figure 47.Stretcher 340 is pivoted around column 3345.Adjuster 35 adjusts stretcher 340 position relative to band 315, to adjust the load for being applied to band 315.

Figure 56 is the detail view of the pedestal in Figure 47.Tensioner assembly 340 is mounted so that its position is adjustable. Adjuster 35 is threadedly engaged with pedestal 300.The position of adjuster 35 determines the position of tensioner assembly 340.Adjuster 35 is stretched Long position is initial makeup location.Being screwed into adjuster 35 pivots stretcher 340 around column 3345, to apply to band 315 Load.Device is converted to retracted position (Figure 57) by this, this gradually increases the tension in ABDS band 200.It adjusts in this way With 200 tension, for obtaining system performance appropriate.

Figure 57 is the detail view of the pedestal in Figure 47.Adjuster 35 is shown in " being screwed into " position, described " to twist Entering " position represents the position of the maximum tension for band 315 and band 200, referring to Figure 15.

The alternate embodiment includes cam 1350 and cam 2350.Cam 1350 and the respective bonding ribbon 315 of cam 2350.It examines Consider the engagement with band 315, the angular movement of lower eccentric arm 130 and lower eccentric arm 230 be it is identical, as long as stretcher group The arm 3460 of part 340 remains stationary.

As other places in the present specification illustrate, it is desirable to improve band during certain operating conditions Tension in 200 slack list, referring to Figure 15.This point realizes that the deflection arm deflects spring 3440 by deflection arm 3460, To improve the torque in arm 3460.It is in torque in arm 3460 and band 315, in the form of the hub load on idle pulley 3500 Tension is opposite.Arm 3460 is set to deflect the torque increased in arm 3460 far from band 315.This makes the tension increase in band 315 simultaneously So that the tension in the slack list section of band 200 increases.

As seen in Figure 56, when lower part eccentric arm 130 and 230 respectively rotates clockwise, cam 2350 is engaged Band 315, and cam 1350 is pivoted away from band 315.Which increase the tensions to band 315, so that arm 3460 deflects, this raising Tension in band 315.This increases the tension in band 200.On the contrary, as seen in Figure 56, if lower eccentric arm 130 It is rotated counterclockwise with 230, then 1350 bonding ribbon 315 of cam, and cam 2350 is pivoted away from band 315.This increases the drawing to band 315 Tightly, so that arm 3460 deflects, to improve the tension in band 315.Which increase the tension in the section of the slack list of band 200.

In operation, each cam contour 1350,2350 makes it possible to realize the additional tension to band 315.It is this right Advantage that there are two additional tension tools with 315.Which increase the deflections of stretcher 340, and which increase the ends for being attached to band 315 The movement of the slack list arm (idle pulley 100) in portion.The increased whole device that is deflected to of stretcher 340 provides additional tension force water It is flat.The shape of cam contour can change the slack list tension of band 200 significantly, that is, can change radius R2.Slack list tensioner arms Increased movement so that under the increased load condition of accessory tapes 200, arm is with cam than not having There is bigger rate in the case where cam and moves in band.This improves the slack list tension of band 200 with increased ratio.This is provided The ability of stretcher is further adjusted for required application.

Alternate embodiment is added to each damping mechanism 140,240 for ring 141,241 is transmitted.Ring 141,241 is transmitted to absorb Pressure from each clutch spring 320,360 and pressure is separated with corresponding damping watts 142,242.Each damping watt It is rotatably fixed to each transmitting ring 141,241, be enable to clutch and makes it possible to control by damping watt Normal force on damping ring.

Tensioner assembly 340 is miniature Z-type stretcher as known in the art.The stretcher occupies the plane of band 200 Interior other not used spaces.Stretcher 340 is mounted so that its position is adjustable.The position of fastener 35 determines The position of tensioner assembly 340.This makes it possible to control the installation tension in band 200 by simply adjusting fastener 35. It moves to tensioner assembly 340 in band 315 and improves band tension, to improve the tension of accessory tapes 200.

Although form of the invention has been described herein, it will be apparent, however, to one skilled in the art, that it is aobvious and It is clear to, it, can be in component and method in the case where not departing from the spirit and scope of the present invention described herein Construction and relationship in terms of be changed.

Claims

1. a kind of stretcher, the stretcher include:

Pedestal；

First pivotal arm is pivotally engaged to the pedestal, for carrying out eccentric motion, first band wheel shaft around first axle Neck is connected to first pivotal arm；

Second pivotal arm is pivotally engaged to the pedestal, for carrying out eccentric motion, the second pulley shaft around second axis Neck is connected to second pivotal arm；

Flexible tension member engages first pivotal arm and second pivotal arm；

Tensioner assembly is pivotally engaged to the pedestal and engages with the flexible tension member；

First damper assembly is frictionally engaged with first pivotal arm, and first damper assembly is along first direction described Apply the damping force bigger than in a second direction on first pivotal arm；

Second damper assembly is frictionally engaged with second pivotal arm, and second damper assembly is along first direction described Apply the damping force bigger than in a second direction on second pivotal arm；And

First pivotal arm includes the first cam portion, and first cam portion gradually engages the flexible tension member, So that the torque of first pivotal arm is variable.

2. stretcher according to claim 1, wherein second pivotal arm further comprises the second cam portion, institute It states the second cam portion and gradually engages the flexible tension member, so that the torque of second pivotal arm is variable.

3. stretcher according to claim 1, wherein the tensioner assembly includes:

Tensioner pivot arm；

Stretcher belt wheel, axle journal are connected to the tensioner pivot arm；

Stretcher torque spring is engaged between the tensioner pivot arm and the pedestal；And

Load is applied to the flexible tension member by the stretcher belt wheel by the tensioner pivot arm.

4. stretcher according to claim 3, wherein adjusted by adjustment means the stretcher relative to described The position of flexible tension member.

5. stretcher according to claim 3 further includes idle pulley, the idle pulley axle journal is connected to the stretcher and pivots Arm, the idle pulley can be engaged with the flexible tension member.

6. stretcher according to claim 1, wherein the flexible tension member includes toothed belt.

7. stretcher according to claim 1, the stretcher is mounted to alternating current generator.

8. stretcher according to claim 1, wherein the flexible tension member is not ring-shaped.