CN1784561A - Linear tension device - Google Patents

Abstract

A linear tensioner (39) has a longitudinally extending first sleeve (40) having an end (42) configured for pivotal coupling and a longitudinally extending second sleeve (60) having an end (62) configured for pivotal coupling. The second sleeve (60) slidably receives the first sleeve (40) and frictionally engages therewith. A biasing member (72) extends between and is housed by the sleeves (40, 60) and urges the sleeves (40, 60) apart. The first sleeve (40) operatively engages with the second sleeve (60) enabling sliding movement within a range and retains the sleeves (40, 60) together against the bias of the biasing member (72).

Description

Linear tension device

Technical field

The present invention relates to a kind of linear tension device that is used for the serpentine belt of tensioning motor car engine.More specifically, the present invention relates to a kind of mechanical linear tensioner.

Background technique

Tension device is generally used for the serpentine belt of continuous tensioning motor car engine.Usually, linear tension device comprises hydraulic pressure or pneumatic cylinder.When being not used in enough spaces of rotary type tension device on the motor, use traditional linear tension device.

Linear tension device generally comprises the carrier board that is pivotally mounted to vehicle motor, is used to carry an idler.Serpentine belt is walked around idler.The linear tension device coupling is associated between the carrier board and motor relative with idler, is used for providing constant tensioning to serpentine belt.

Hydraulic pressure or pneumatic cylinder all can have the shortcoming of what is called " pump plays (pump up) " phenomenon.Tension device provides pressure in response to belt vibration, and can not discharge this pressure.Tension device trends towards the over-tension belt and therefore reduces the working life of belt.

Other mechanical linear tensioner shown in the prior art.U. S. Patent 6,422,964 illustrate such tension device.Yet such tension device needs pin so that tension device is kept together in transportation process, and must remove described pin after on being installed on belt pulley.

Summary of the invention

Be desirable to provide a kind of linear tension device that can the over-tension serpentine belt.

Be desirable to provide a kind of linear tension device, it comprises: first sleeve pipe and second sleeve pipe that slide over each other and hold, described sleeve pipe cover a skew spring, and this spring makes described sleeve pipe separately.Have connection between first sleeve pipe and second sleeve pipe, the sliding movement that the biasing that this connection restriction overcomes displacement member is carried out remains on first sleeve pipe in second sleeve pipe.

Linear tension device has according to an aspect of the present invention: first sleeve pipe of a longitudinal extension, one end be configured to pivot coupling connection; And second sleeve pipe of a longitudinal extension, one end be configured to pivot coupling connection.Second sleeve pipe holds first sleeve pipe and frictional engagement with it slidably.One displacement member is extended between described sleeve pipe and is made described sleeve pipe separately.First sleeve pipe and second sleeve pipe running ground engages, and feasiblely can carry out sliding movement in a scope, and overcomes the bias voltage of displacement member and sleeve pipe is kept together.

According to a further aspect in the invention, linear tension device has with bayonet socket mode coupling and is associated in together sleeve pipe.

Description of drawings

In conjunction with the accompanying drawings, be easy to understanding and understand advantage of the present invention better by the reference following detailed, in described accompanying drawing:

Fig. 1 is the front view that has the motor car engine of linear tension device according to an embodiment of the invention;

Fig. 2 is the part exploded perspective view of linear tension device;

Fig. 3 is the cross sectional view of linear tension device;

Fig. 4 is second embodiment's of linear tension device a decomposition side view;

Fig. 5 is second embodiment's of linear tension device a cross sectional view;

Fig. 6 is the 3rd embodiment's of linear tension device a stereogram;

Fig. 7 is the 3rd embodiment's of linear tension device a cross sectional view;

Fig. 8 is the 4th embodiment's of linear tension device a stereogram;

Fig. 9 is the 4th embodiment's of linear tension device a cross sectional view;

Figure 10 is the 5th embodiment's of linear tension device a stereogram;

Figure 11 is the 5th embodiment's of linear tension device a cross sectional view;

Figure 12 is the 6th embodiment's of linear tension device a stereogram;

Figure 13 is the 6th embodiment's of linear tension device a cross sectional view;

Figure 14 is the 7th embodiment's of linear tension device a stereogram;

Figure 15 is the 7th embodiment's of linear tension device a cross sectional view;

Figure 16 is the 8th embodiment's of linear tension device a cross sectional view;

Figure 17 is the 9th embodiment's of linear tension device a part exploded perspective view;

Figure 18 is the 9th embodiment's of linear tension device a stereogram;

Figure 19 is the 9th embodiment's of linear tension device a cross sectional view;

Figure 20 is another cross sectional view of the 9th embodiment of linear tension device;

Figure 21 is the tenth embodiment's of linear tension device a stereogram;

Figure 22 is the tenth embodiment's of linear tension device a cross sectional view;

Figure 23 is another cross sectional view of the tenth embodiment of linear tension device.

Embodiment

With reference to Fig. 1, a kind of motor of automotive vehicle that is used for is on the whole with label 10 indications.One crank sleeve 12 is driven rotationally by the torque that motor 10 provides.One crank pulley 14 is fixedly secured to crank sleeve 12.Motor 10 also comprises a plurality of by engine-driven supplementary equipment, for example alternator or water pump.Each comprises a rotating input sleeve pipe 16 and an input belt pulley 18 that is fixedly mounted in it together by engine-driven supplementary equipment.Each is driven by the rotation of engine-driven supplementary equipment by input sleeve pipe 16.One serpentine belt 20 is wrapped on crank pulley 14 and the input belt pulley 18.Belt 20 is delivered to input belt pulley 18 with the torque that motor 10 provides from crank pulley 14.Belt 20 converts the rotational motion of crank pulley 14 to the rotational motion of input belt pulley 18.One tension device 30 makes belt 20 keep tensioning, slides with respect to crank pulley 14 and input belt pulley 18 to prevent belt 20, will describe in detail below.

Tension device 30 comprises a carrier board 32.First transmit device 34 is pivotally connected to motor 10 with carrier board 32.First transmit device 34 comprises that a collar is used to support a lining ring and a plurality of damping washer, and this collar is formed with a hole of running through carrier board 32.One construction bolt passes described lining ring, packing ring and hole, tension device 30 is fixed on the motor 10 pivotally, and packing ring provides damping effect to the vibration that produces on the belt 20.Transmit device 34 has been described in the D.B.P. 10053186 in more detail.

Idler 36 is coupled on the carrier board 32 rotationally by second pin 38, and described second pin, 38 and first transmit device 34 is spaced apart.Belt 20 is walked around idler 36.Idler 36 pivots around first transmit device 34 with plate 32.As shown in fig. 1, when carrier board 32 when counterclockwise pivoting, idler 36 tightening belts 20 are to increase the tension force of belt 20.When carrier board 32 pivoted toward the clockwise direction, idler 36 moved apart belt 20 to reduce the tension force of belt 20.

Comprise friction prop or the sleeve structure that symmetrical damping force, asymmetric damping power and/or undamped power can be provided as the disclosed linear tension device of a plurality of embodiments of the present invention, its.The symmetry damping is to be produced by the sleeve pipe of linear tension device and the sliding contact surface between sleeve pipe, and irrelevant with the moving direction of parts.Asymmetric damping also is to be produced by the frictional contact surface between sleeve pipe and the sleeve pipe, but damping force is relevant with the moving direction of parts.Damping force when the damping force when usually, sleeve pipe carries out contractile motion is extended than sleeve pipe is big.Un-damped linear tensioners of the present invention has minimum frictional engagement between sleeve pipe and sleeve pipe.The effect of described sleeve pipe and sleeve pipe is the compression that guiding places spring within two sleeve pipes.Typically, damping piece or associate member can be included among the undamped embodiment, and can be positioned at linear tension device and be installed to pivot place on the motor---the description of as above being done in the face of first transmit device 34, will discuss in further detail below.

With reference to Fig. 2 and Fig. 3, linear tension device is on the whole with label 39 indications.Linear tension device 39 is included in first sleeve pipe 40 that extends between near-end 42 and the far-end 44.That sleeve pipe 40 is preferably cast or through the alumiaum article of machining.Sleeve pipe 40 is included in the tubular body 46 that extends between near-end 42 and the far-end 44.Tubular body 46 comprises and is roughly columnar internal surface 48 and outer surface 50.Internal surface 48 first or interior abutment surface 52 and far-end 44 between extend.Be formed with pivoting hole at near-end 42 places or eye 53 is used for installing therein first lining ring 56.

Preferably, lining ring is the metal DU type lining ring of push-in type or compression fit formula.Yet, can use the thin layer type lining ring that is slidingly matched, self-lubricating type (spray on) or hot sleeve type (dipped) lining ring or rubber eyelet (rubber eyelet) type lining ring.

The 3rd pin 54 extends through lining ring 56 and the near-end 42 of sleeve pipe 40 is pivotally connected to motor 10.Perhaps, the near-end 42 of sleeve pipe 40 can for example bolt, the link that is clasped, ball-and-socket link etc. be installed on the motor 10 by any suitable fastening piece such as the known link of one of ordinary skilled in the art.

Linear tension device 39 also is included in second sleeve pipe 60 that extends between near-end 62 and the far-end 64.Second sleeve pipe 60 is molded plastic parts preferably.Sleeve pipe 60 is included in the body 66 of the substantial cylindrical of extending between near-end 62 and the far-end 64.Sleeve body 66 be included in sleeve pipe 60 second in the general cylindrical shape internal surface 68 that extends between abutment surface 70 and the far-end 64.One pivoting hole 69 is formed in the sleeve body 66 and is adjacent to near-end 62, is used for second lining ring 73 is installed in wherein.

The 4th pin 71 extends through lining ring 73 and the near-end 62 of sleeve pipe is pivotally connected to plate 32.

The outer surface 50 of body 46 is slidably received within the internal surface 68 of sleeve pipe 60.The frictional force that is dimensioned to the generation prearranging quatity of the outer surface 50 of body 46 and the internal surface 68 of sleeve pipe 60.This frictional force is so that roughly symmetrical manner inhibition sleeve pipe 60 is with respect to the motion of sleeve pipe 40, and the resistance size is consistent in the process of linear tension device 39 compressions and elongation.

Biasing member 72 is preferably a helical coil springs and is contained in sleeve pipe 40 and 60, and is compressed between first abutment surface and second abutment surface, thereby makes sleeve pipe 40 and sleeve pipe 60 axial dipole fields separately.Sleeve pipe 60 makes plate 32 towards the counter clockwise direction pivot offset with respect to the axial dipole field of sleeve pipe 40, this again tensioning belt 20.

Sleeve pipe 40 and 60 has and interconnects, and this interconnects and makes the skew that can slide and resist displacement member 72 between the described sleeve pipe that two sleeve pipes are kept together.This interconnects and generally includes the protuberance that slidably engages with groove.This groove limits the scope of sliding movement, limits the described limit with the one end.The scope of sliding movement comprises the operating range or the operating range of motion.The length of groove 78 limits the sliding movement scope bigger than the expection operating range of tension device 39.

In first preferred embodiment, described interconnecting is protuberance or the resilent finger 74 that forms on the radially opposite side of a pair of body 46 along sleeve pipe 40.The tip of resilent finger 74 is limited by barb 76.Be formed with a ramp surface 84 in each barb 76, be convenient to body 46 insertion sleeve bodies 66 and prevent from simultaneously to throw off.

Sleeve pipe 60 comprises corresponding a pair of elongated slot 78, and this extends between first end 80 of formation and second end 82 in sleeve body 66 corresponding to barb 76 elongated slot.Each barb 76 is outstanding to be passed corresponding groove 78 and is slidably engaged in wherein.Barb 76 defines the scope that sleeve pipe 60 moves apart sleeve pipe 40.

Insert in the process of sleeve body 66 at body 46, inclined surface 84 engages with the far-end 64 of sleeve pipe 60.Inclined surface 84 makes finger shape plate 74 that resiliently deformable take place with the engaging of far-end 64 of sleeve pipe 60, and inwardly displaced barb 76, is sliding engaged to up to barb 76 and groove 78.The sliding movement of barb 76 in groove 78 is by first end 80 and 82 restrictions of second end of groove 78, and this defines the axial movement of sleeve pipe 60 with respect to sleeve pipe 40.Locking between barb 76 and the groove 78 connects makes sleeve pipe 40 be connected slidably with sleeve pipe 60, and spring 72 is compressed in therebetween, assembles, deposits, transports thereby tension device 30 can be used as pre-assembling part and/or be assembled on the vehicle motor.

Under the situation that other parts remain unchanged, can realize first embodiment's undamped type tension device with the frictional engagement of sleeve pipe 60 by reducing sleeve pipe 40.

As clearly shown in Figure 1, first embodiment of linear tension device 39 can be arranged on and comprise on the front end accessory drive system that surmounts decoupler 19.Owing to the tensioning tool of the high inertia that surmounts decoupler 19 to belt 20 has a significant impact, be associated with alternator usually thereby surmount decoupler 19.Surmount the dynamic tension in the belt 20 that decoupler 19 reduced whole system, provide one need be than the total system of low damping force.

A kind of decoupler that surmounts of simple form comprises by a resilient member connected to one another with an overrunning clutch and the belt lacing member that is connected with wheel hub structure running ground.Overrunning clutch and resilient member preferably include a spiral spring device.Belt pulley with respect to wheel hub in the acceleration on the driving direction and the friction of rotating in belt pulley perimeter surface and preferably producing between all circles of clutch spring.Clutch spring is a coiled coil, thereby the frictional force between the inner peripheral surface of belt pulley and at least one circle will make clutch spring radial outward expansion and push against interior perimeter surface.Belt pulley will make against the roughly exponential outwardly increase of radial force of the circle effect of interior perimeter surface with respect to the continuous rotation of wheel hub on driving direction, and become up to all circles of clutch spring engages with belt pulley with braking fully.When pulley decelerates, by with rotation in drive sleeve and the wheel hub that inertia drove that is associated of the gyrating mass of alternator will begin " surmounting " or continue on driven direction, to rotate with the speed that is higher than belt pulley.More specifically, wheel hub makes clutch spring with respect to interior perimeter surface radial contraction with respect to the higher rotation speed of belt pulley.Brake engagement between clutch spring and the belt pulley is disengaged, and therefore allows the sleeve pipe of alternator and wheel hub to move with respect to the belt pulley hypervelocity.Described a kind of preferred Decoupling design in claimant's the U. S. Patent 6,083,130, this patent has transferred assignee of the present invention.More than and following described all linear tension device embodiments can be applied in and include one and surmount on the front end accessory drive system of decoupler 19.

With reference to Fig. 4 and Fig. 5, second embodiment of linear tension device 39 is shown.The locking of bayonet type (bayonet-type) between the sleeve pipe 40 of second embodiment's linear tension device 39 and sleeve pipe 60 pass through connects and coupling connection slidably.Particularly, linear tension device 39 is included in a sleeve pipe 40 that extends between near-end 42 and the far-end 44 similarly.Columniform body 46 is limited by internal surface 48 and outer surface 50.Internal surface 48 extends between first abutment surface 52 and far-end 44.One hole 53 extends through near-end 42 and is used for sleeve pipe 40 is installed to carrier board 32.One hub 21 is axially outstanding from first abutment surface 52, is used for an end of displacement member 72 is installed in the body 46.The outer surface 50 of one offset-lock groove, 22 recessed bodies 46, and 46 extend axially from far-end 44 towards near-end.Offset-lock groove 22 comprises first linear segment 23 and from an almost parallel second linear segment 24 of first linear segment, 23 radial deflections.First linear segment 23 and second linear segment 24 interconnect along circumferential extension and with the third part 25 of described linear segment approximate vertical by therebetween.First linear segment 23 has the opening 26 with the contiguous expansion of the far-end 44 of body 46.

Second embodiment's of Fig. 4 and Fig. 5 linear tension device 39 further is included in a sleeve pipe 60 that extends between near-end 62 and the far-end 64.Cylindrical shroud tube body 66 is included in the internal surface 60 that extends between second abutment surface 70 of sleeve pipe 60 and the far-end.Hole 69 extends through near-end 62, is used for sleeve pipe 60 is installed to motor 10.One hub 27 is axially outstanding from second abutment surface 70, is installed in the sleeve body 66 with the other end with displacement member 72.A pair of guide tabs 28 is radially inwardly given prominence to from the opposite side of the internal surface 68 of sleeve body 66, and contiguous its far-end 64.Pair of openings 29 extends through internal surface 68 and is adjacent to its near-end 62 along the opposite side of sleeve body 66, overflows in body 46 to allow air.

In the assembling, sleeve pipe 40 is connected by bayonet locking with sleeve pipe 60 and slidably and rotationally connects.Displacement member 72 between sleeve pipe 40 and sleeve pipe 60, and make its opposite end aim at ground respectively around hub 21,27 install and between sleeve pipe by compression.Guide tabs 28 axially and the footpath upwards aim at the inlet 26 of the expansion of first linear segment 23 of each corresponding offset-lock groove 22.Along with key portion 28 endwisely slips and slips in the 3rd groove 25 sleeve pipe 40 and sleeve pipe 60 axial compression displacement member 72 along first linear channel 23.Then, sleeve pipe 40 rotates so that key portion 28 is moved into second linear segment 24 along third part 25 with respect to sleeve pipe 60.After the rotation, displacement member 72 by compression keeps key portion 28 between first end wall 31 and second end wall 33 of second linear segment 24, therefore with sleeve pipe 40 and sleeve pipe 60 couplings connection, and defines the longitudinal movement scope of sleeve pipe 60 with respect to sleeve pipe 40.Restricted and air by compression can be overflowed from the opening 29 of sleeve pipe 60 between sleeve pipe 40 and the sleeve pipe 60.

With reference to Fig. 6 and Fig. 7, the 3rd embodiment of tension device 139 is shown, similar member is by the reference number indication that differs 100 among the wherein optional embodiment and first embodiment and second embodiment.At least one but preferably a plurality of longitudinal extension groove or groove 86 are integrally formed on the outer surface 150 of sleeve pipe 140.The internal surface 168 of sleeve pipe 160 has one group and protrudes piece 87 accordingly.Protruding piece 87 slides in groove 86.The scope that the ends restrict sleeve pipe 140 of groove 86 and sleeve pipe 160 move relative to each other.The protrusion piece 87 of projection provides the control to thermal expansion, also provides discharge passage for the impurity that enters linear tension device 139 simultaneously.

With reference to Fig. 8 and Fig. 9, the 4th embodiment of tension device is on the whole with 239 indications.One keeps circle 88 to be installed on the far-end 264 of sleeve pipe 260 regularly.At least one spring washer 89 is supported on and keeps between circle 88 and the sleeve pipe 260, is used for outer surface 250 or protrusion piece 286 frictional engagement with sleeve pipe 240.Spring washer 89 and outer surface 250 or the frictional force of protruding between the piece 286 suppress the sliding movement of sleeve pipe 260 with respect to sleeve pipe 240.Preferably, spring washer 89 be taper with provide asymmetric or etc. big damping force, under the situation of asymmetric damping force, frictional force is bigger during than elongation when linear tension device 239 shrinks.

With reference to Figure 10 and Figure 11, the 4th embodiment of tension device is on the whole with label 339 indications.One sleeve pipe, 90 couplings are associated between the internal surface 368 of the outer surface 350 of sleeve pipe 340 and sleeve pipe 360.Sleeve pipe 90 comprises at least one but preferably a plurality of finger shape plate 91.Each finger shape plate in a plurality of finger shape plate 91 stretches out with the angle with respect to sleeve pipe 340, like this in linear tension device 339 compression processes, and internal surface 368 frictional engagement of each finger shape plate in a plurality of finger shape plate 91 and sleeve pipe 360.A plurality of finger shape plate 91 trend towards making a plurality of finger shape plate 91 deflections or the crooked axis that is substantially perpendicular to sleeve pipe 340 up to each finger shape plate with the frictional engagement of the internal surface 368 of sleeve pipe 360.The deflection of a plurality of finger shape plate 91 is with outer surface 350 or the protrusion piece 386 radial inward pushing of sleeve pipe 90 with respect to sleeve pipe, and this has increased frictional force and has suppressed the motion of sleeve pipe 360 with respect to sleeve pipe 340.

With reference to Figure 12 and Figure 13, the 6th embodiment of linear tension device is on the whole with label 439 indications.Linear tension device 439 comprises that one keeps sleeve pipe 92, and this maintenance sleeve pipe 92 is fixedly secured to the far-end 464 of sleeve pipe 460.At least one back-up ring 93 coupling is associated between the outer surface 350 that keeps sleeve pipe 92 and sleeve pipe 340.Back-up ring 93 comprises a spring sheet 94, and this spring sheet makes back-up ring 93 be offset pivotly around fulcrum 94a.Spring sheet 94 pushes away back-up ring 93 outer surface 350 frictional engagement that keep sleeve pipe 92 and make back-up ring 93 and sleeve pipe 340.The outer surface 350 of back-up ring 93 and sleeve pipe 340 or the contraction and the extension of protruding the frictional engagement inhibition linear tension device 439 between the piece 386.Because back-up ring 93 pivots around fulcrum 94a and is offset, frictionally engaging within linear tension device 439 contraction processes between back-up ring 93 and outer surface 350 or the protrusion piece 386 than big in the elongation process.

With reference to Figure 14 and Figure 15, the 7th embodiment of linear tension device is on the whole with label 539 indications.Back-up ring 95 is installed on the far-end 544 of sleeve pipe 540 regularly.At least one but be preferably a plurality of isolated diagonal supporting members 96 and be integrally formed on the back-up ring 95.In the assembling process of sleeve pipe 540 and sleeve pipe 560, a plurality of diagonal supporting members 96 are with respect to the internal surface 568 of sleeve pipe 560 and towards internal shift.The inwardly displaced of diagonal supporting member 96 reversed preload to back-up ring 95, thereby a plurality of diagonal supporting member 96 constantly is offset to internal surface 568 frictional engagement with sleeve pipe 560.The frictional engagement of the internal surface 568 of described a plurality of diagonal supporting member 96 and sleeve pipe 560 suppresses the contraction of linear tension device 539.

With reference to Figure 16, the 8th embodiment of linear tension device is on the whole with label 639 indications.A plurality of diagonal supporting members 97 are integrally formed in the far-end 644 of sleeve pipe 640, and are mounted thereon pivotally by the plan hinge at 97a place, and the hinged 97a of this plan hinge produces by the recess 97b that cuts out in the sleeve pipe 640.In a plurality of diagonal supporting members 97 each comprises a step surface 98.Second displacement member 99 that is preferably the helical coil springs form is compressed between second abutment surface 670 of ledge surface 98 and sleeve pipe 660.The described a plurality of diagonal supporting members 97 of second displacement member, 99 skews make it internal surface 668 frictional engagement with sleeve pipe 660.Frictional engagement between the internal surface 668 of described a plurality of diagonal supporting member 97 and sleeve pipe 660 suppresses the contraction and the elongation of linear tension device.

With reference to Figure 17-23, the non-damp type embodiment of linear tension device of the present invention has been described.

With reference to Figure 17-20, show the 9th embodiment of linear tension device 739 of the present invention.Because this embodiment is non-damping, sleeve pipe 740 has minimum frictional engagement with sleeve pipe 760.Embodiment as described above, a displacement member or skew spring (not shown) are compressed between first abutment surface 752 and second abutment surface 770 constantly, make sleeve pipe 740 and sleeve pipe 760 axial dipole fields separately.

The 9th embodiment comprises an optional embodiment who is used for sleeve pipe 740 and sleeve pipe 760 couplings connection.Sleeve pipe 740 comprises a bayonet socket protuberance 701 that radially extends from sleeve pipe 740.Bayonet socket protuberance 701 is contained in the keyway 702, and this keyway 702 is formed in the end cap 704 on sleeve pipe 760 far-ends.As shown in figure 17, bayonet socket protuberance 701 on the sleeve pipe 740 is aimed at keyway 702, then as shown in figure 18, in sleeve pipe 760, be along the longitudinal movement and radially rotate with against an abutment surface 703, and this abutment surface 703 is formed by the internal surface of the end cap 704 of sleeve pipe 760.In this way, sleeve pipe 740 remains in the sleeve pipe 760.Other embodiment who should be appreciated that among the present invention to be discussed---comprises and suppresses the molded lines tension device---and can use described any Placement.For the sake of clarity and avoid inhibition type and non-inhibition molded lines tension device all to be repeated in this description, under non-inhibition molded lines tension device situation, bayonet socket protuberance 701 is described.

With reference to Figure 21-23, the tenth embodiment of linear tension device 839 of the present invention is shown.The same with previous embodiment, the tenth embodiment is that sleeve pipe 840 and sleeve pipe 860 carry out the non-inhibition type that minimized friction engages.The same with previous embodiment, displacement member or spring (not shown) are compressed between first abutment surface 852 and second abutment surface 870 constantly, make sleeve pipe 840 and sleeve pipe 860 be offset vertically separately.

Be used for the sleeve pipe 840 and the optional linkage structure of sleeve pipe 860 couplings connection are included in the groove 801 of the sleeve pipe circumferential formation in 860 edges among the tenth embodiment, in groove 801, fill in C type snap ring 802.Sleeve pipe 840 places in the sleeve pipe 860, and snap ring 802 is filled in the groove 801 with engaging surface 803 so that sleeve pipe 840 is remained in the sleeve pipe 860 then, and described surperficial 803 are formed by the outer surface that has downward step type recess 804 in the sleeve pipe 804.Embodiment is the same as described above, and the linkage structure of snap ring 802 types can be used for comprising among the previously described any embodiment who suppresses the molded lines tension device.

The rejection characteristic of tension device can change, and corresponding to concrete motor, additional load and engine torque.Damping loss when the friction between the packing ring of first transmit device 34, sleeve pipe 40 and the sleeve pipe 60, spring 72 pressurizeds and elongation and/or the friction that causes owing to the rotational motion between pivot packing ring 56,73 and the construction bolt all can provide damping, and embodiments of the invention described above all are like this.

The present invention is described with exemplary approach, and should be appreciated that employed term is descriptive and nonrestrictive.According to above content, can carry out many places modification and change to the present invention.Therefore, should be appreciated that the present invention can implement and is not limited to detailed description in the appended claims scope.

Claims (16)

1. linear tension device, it is suitable for coupling and is associated in the serpentine belt that is used for the tensioning motor car engine between a motor and the idler, and this linear tension device comprises:

First sleeve pipe of one longitudinal extension, one end be configured to pivot coupling connection;

Second sleeve pipe of one longitudinal extension, one end be configured to pivot coupling connection, described second sleeve pipe hold described first sleeve pipe and frictional engagement with it slidably; And

A displacement member that extends between the described sleeve pipe forces described sleeve pipe separately;

Engage to the running of described first sleeve pipe and second sleeve pipe, thus can one greater than the scope of the operating range of described linear tension device in sliding movement, and overcome the bias voltage of described displacement member and described sleeve pipe kept together.

2. linear tension device as claimed in claim 1, wherein, the joint of described running comprises: one in described first sleeve pipe and second sleeve pipe has at least one protuberance, and in described first sleeve pipe and second sleeve pipe another has at least one corresponding elongated slot, in described groove, hold a corresponding protuberance in described at least one protuberance, described at least one protuberance is against an end of described groove, overcomes the bias voltage of described displacement member and limits described sliding movement.

3, linear tension device as claimed in claim 2, wherein, described protuberance has a barb, and this barb is made by bias voltage to win sleeve pipe can insert in second sleeve pipe and prevents that it breaks away from from second sleeve pipe.

4. linear tension device as claimed in claim 3, wherein, described barb is positioned at the far-end of resilent finger.

5. linear tension device as claimed in claim 2, wherein, described groove has: first portion; Second portion, its substantially parallel described first portion extends and circumferentially staggers from first portion; And third part, it circumferentially extends between first portion and second portion and first portion and second portion is connected with each other.

6. linear tension device as claimed in claim 5, wherein, described first linear segment comprises the inlet of an expansion, is used to make described protuberance to aim at first portion.

7. linear tension device as claimed in claim 6, it further comprises: the isolated key of a pair of opposite side along described internal surface of casing portion; And a pair of offset-lock groove, it is formed at and is used on the described bushing outer surface therein slidably holding described corresponding pair of keys portion with locking ground.

8. linear tension device as claimed in claim 1, wherein, the joint of described runnability comprises: the protuberance of at least one protrusion from described sleeve pipe and one are fixed in another the end cap in the described sleeve pipe, described end cap has at least one corresponding keyway, be used for being inserted in described second sleeve pipe and holding described at least one protuberance therein along with described first sleeve pipe slides, wherein, in case described at least one protuberance passes the keyway of described correspondence, described sleeve pipe rotates and makes described at least one protuberance against engaging described end cap.

9. linear tension device as claimed in claim 1, wherein, the joint of described running comprises: in the described sleeve pipe one has in an abutment facing and the described sleeve pipe another and has an extending circumferentially groove, one snap ring is installed in the described groove and engages with described abutment facing, prevents described sleeve pipe separation.

10. each described linear tension device as in the above-mentioned claim, it further comprises: the maintenance circle on of being installed on regularly in the described sleeve pipe; And at least one is supported on the spring washer between described maintenance circle and this sleeve pipe, and another frictional engagement in described spring washer and the described sleeve pipe is to suppress described sliding movement therebetween.

11. linear tension device as claimed in claim 10, it further comprises: the maintenance circle on of being installed on regularly in the described sleeve pipe; And at least one coupling is associated in the back-up ring between described maintenance circle and this sleeve pipe, described back-up ring comprises a spring sheet, this spring sheet is used for described back-up ring is displaced to another frictional engagement with described sleeve pipe against described maintenance circle by compression, thereby suppresses described sliding movement.

12. linear tension device as claimed in claim 11, it further comprises a plurality of circlips, described circlip is from an end longitudinal extension of one of described sleeve pipe, and radial outward be displaced to described sleeve pipe in another frictional engagement, be used to suppress described sliding movement therebetween.

13. linear tension device as claimed in claim 12, wherein, described back-up ring forms, a described sleeve pipe is included in the recess that is positioned on its outer surface, intend hinge to form, make that described back-up ring can pivot movement, and described tension device further comprises second displacement member, this second displacement member be used for forcing described back-up ring and described sleeve pipe another engage.

14. as each the described linear tension device in the claim 1 to 9, wherein, each described sleeve pipe has an eyelet that allows pivot coupling connection.

15. linear tension device as claimed in claim 14 wherein, is installed a packing ring in each described eyelet.

16. a tension device, it comprises: a substrate, this substrate have first hinge connector substrate is installed on the motor; A belt pulley, this belt pulley is pivotally mounted to described substrate; And each described linear tension device in as the above-mentioned claim, be connected to one of them described sleeve pivots substrate, and another sleeve pipe is pivotally connected to motor.

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