CN103765044B

CN103765044B - Chain drive tensioner spring force control mechanism

Info

Publication number: CN103765044B
Application number: CN201280042785.8A
Authority: CN
Inventors: K·B·托德
Original assignee: BorgWarner Inc
Current assignee: BorgWarner Inc
Priority date: 2011-09-22
Filing date: 2012-09-06
Publication date: 2017-02-08
Anticipated expiration: 2032-09-06
Also published as: CN103765044A; JP6189846B2; RU2014113136A; DE112012003408T5; KR101939967B1; JP2014528047A; WO2013043373A1; JP2017215046A; KR20140065437A; JP6609603B2

Abstract

A tensioner in which an inward force acting to push a piston into a housing creates a fluid pressure in a hydraulic chamber formed by a cylindrical bore of the housing and a moveable sleeve, causing a movable sleeve to exert an outward force on the piston through a piston spring, opposing the inward force.

Description

Chain drive tensioners spring force controlling organization

Technical field

The invention belongs to the field of stretcher.More specifically, the invention belongs to chain drive tensioners spring force controls Mechanism.

Background technology

In general, convex in the timing chain that the valve for internal combustion engine drives, for camshaft-camshaft actuated Can have stretcher, these stretchers are used in the slack side of chain to tighten up this in wheel shaft chain and in balancer chains Loose degree in chain simultaneously applies tension force to this chain.

In running, the piston of stretcher is pressed against on chain to maintain the tension force in chain.In running, When the tension force in chain is because chain span resonates when increasing, from chain high capacity act on stretcher piston on, So that piston is retracted in the housing of stretcher.

The spring force of chain drive tensioners is typically too high for most of service conditions, and this just makes this spring force Enough to deal with the service condition of the worst case of tensioner system.If stretcher spring force can consider during service life of chain The abrasion and the stretching that occur and if being changed with service condition, the effect of stretcher and overall system characteristic and efficiency Can be obtained by improving.

Content of the invention

Provide a kind of stretcher, one of inward force act as by a piston push in a housing A Fluid pressure is created in the hydraulic chamber being formed by a cylindrical hole and displaceable sleeve of this housing, So that displaceable sleeve pass through a piston spring this piston is applied one contrary with this inward force outside Power.

Brief description

Fig. 1 a shows the schematic diagram of the stretcher of passive tensioner system of first embodiment of the new chain of tensioning one. Fig. 1 b shows the schematic diagram of the stretcher of a piece worn chain of tensioning in the case of no high capacity.Fig. 1 c shows have The schematic diagram of the stretcher of a piece worn chain of tensioning in the case of high capacity.

Fig. 2 shows the schematic diagram of the stretcher of passive tensioner system of second embodiment of the new chain of tensioning one.

Fig. 3 shows the schematic diagram of the stretcher of passive tensioner system of 3rd embodiment of the new chain of tensioning one.

Fig. 4 shows the schematic diagram of the stretcher of passive tensioner system of fourth embodiment, employs removable at one Between the excircle flange of moving sleeve and the hole flange of this housing formed multiple chambers come to maintain this displaceable sleeve with respect to The position of this piston, with piece new chain of tensioning.

Fig. 5 shows the schematic diagram of the stretcher of passive tensioner system of the 5th embodiment, employs in this housing The multiple chambers being formed between an otch on the excircle of hole flange and this displaceable sleeve are maintaining this displaceable sleeve With respect to the position of this piston, with piece new chain of tensioning.

Fig. 6 shows the schematic diagram of the stretcher of passive tensioner system of sixth embodiment, employs removable at one The multiple chambers being formed between the excircle flange of moving sleeve and the hole of this housing are maintaining this displaceable sleeve with respect to this work The position of plug, with piece new chain of tensioning.

Fig. 7 shows the schematic diagram of the stretcher of passive tensioner system of the 7th embodiment, employs removable at one The multiple chambers being formed between the excircle flange of moving sleeve and the hole flange being provided by a guiding valve of this housing to maintain this Displaceable sleeve with respect to the position of this piston, with piece new chain of tensioning.

Fig. 8 shows the schematic diagram of the stretcher of passive tensioner system of the 8th embodiment, employs removable at one The multiple chambers being formed between the hole being provided by a guiding valve of the excircle flange of moving sleeve and this housing and a holder To maintain the position that this displaceable sleeve is with respect to this piston, with piece new chain of tensioning.

Fig. 9 shows the schematic diagram of the stretcher of active tensioner system of the 9th embodiment, employs feedback control Move and maintain a displaceable sleeve with respect to piston with piece new chain of tensioning.

Figure 10 shows the schematic diagram of the stretcher of active tensioner system of the tenth embodiment, employs feedback control With respect to piston, a mobile displaceable sleeve is with piece new chain of tensioning.

Specific embodiment

Multiple tensioner systems shown in 8 for Fig. 1 a to maintain a displaceable sleeve with respect to one using passive control The position of piston.Passive control is defined as following system：Wherein do not feedback used to adjust a displaceable sleeve with respect to The position of one piston of this stretcher.By contrast, Fig. 9 and 10 is active control system, is wherein many using engine Individual part and/or this displaceable sleeve Real-time Feedback of itself adjusting the position of this sleeve.

The tensioner system of the present invention includes a stretcher（Describe more fully below）, this stretcher be used for one An individual closed loop chain drive system used in explosive motor.It can be used for power transmission shaft and at least one bent axle it Between closed loop power transmission system on or be used on balance shaft system between power transmission shaft and a balance shaft.This stretcher system System can also include an oil pump and be used together with multiple fuel pump driver.In addition, these stretcher systems of the present invention System can also be used together with belt driver.

Fig. 1 a to 1c shows the stretcher of the first embodiment carrying out tensioning under the conditions of different chains；Fig. 1 a is to open Tight one new chain；Fig. 1 b is piece worn chain of tensioning in the case of no high capacity；Fig. 1 c is that have a case that high capacity Lower piece worn chain of tensioning.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has One inside carrying the first diameter portion D1 and Second bobbin diameter part D2, wherein Second bobbin diameter part D2 are more than the first diameter portion Divide D1.

One displaceable sleeve 18 is received in the hole 2a of housing 2.This displaceable sleeve 18 is hollow and with shell Inside the hole 2a of body 2, the inside diameter portion 17 of hollow displaceable sleeve 18 or hollow and the inside 3a of piston 3 defines one The individual pressure chamber 16 with pressure P1.

One sleeve spring 5 is present in the 2a of hole and is received in the inside diameter portion 17 of displaceable sleeve 18, its In first end 5a of this sleeve spring 5 contact with a basal surface 24 of the inward flange 22 of this displaceable sleeve 18, and should Second end 5b of sleeve spring 5 is contacted with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force should to reduce Displaceable sleeve 18 is maintained at the controling power required for desired position with respect to piston 3.

This displaceable sleeve 18 has an excircle flange 20, and the diameter of displaceable sleeve 18 is increased by this excircle flange Big arriving is substantially equal to Second bobbin diameter part D2, but permission flange 20 slides and at this in Second bobbin diameter part D2 of hole 2a Form a fluid chamber 14 between the basal surface 27 of excircle flange 20 and Second bobbin diameter part D2 of hole 2a.This fluid chamber 14 is to be in fluid communication with an oil pressure source of supply 7 by a supply line comprising check-valves 10 12.This confession Answer source 7 to fluid chamber 14 supply fluid to compensate any leakage being likely to occur.This check-valves 10 prevents this fluid chamber 14 Any fluid back in this source of supply 7.It should be noted that not to top surface 29 and the hole of this excircle flange 20 Region supply fluid pressure between 2a.

At least a portion before outer circumferential flange 20 of this displaceable sleeve 18 is slidably received hollow and lives Within plug 3.Also there is one and make the outwardly biased piston spring from housing 2 of piston 34 in hollow piston 3.This piston bullet Spring 4 have first end 4a contacting with the inside 3a of hollow piston 3 and with the inward flange 22 of displaceable sleeve 18 The second end 4b that top surface 26 contacts.One through hole 25 is present in inward flange 22 thus allowing fluid from entrance supply Pipeline 6 flow into piston 3 inside 3a and flow to displaceable sleeve 18 inward flange 22 top surface 26.

There may be an inlet non-return valve at the bottom of hole 2a（Not shown）And one be used for pressure chamber 16 The entrance supply line 6 of oil pressure is provided.To fluid chamber 14 provide fluid source of supply 7 can with to entrance supply line 6 There is provided the source of supply of fluid identical.Alternatively, can be with same fluid chamber 14 to the source of supply of entrance supply line 6 offer fluid This source of supply 7 being in fluid communication differs.Additionally, there may be an exhaust outlet or pressure release in hollow piston 3 Valve（Not shown）.

Referring to Fig. 1 a, when this stretcher is in a piece new chain of tensioning, in operation, fluid is from entrance supply line 6 and be provided to this hydraulic chamber 16 to be pressurized to this hydraulic chamber 16 optionally by an inlet non-return valve And also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus to this closed loop chain A span be biased.

Referring to Fig. 1 b, when this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, Fluid is from entrance supply line 6 and optionally by an inlet non-return valve（Not shown）And it is provided to this hydraulic chamber 16 So that this hydraulic chamber 16 is pressurized and in addition to the spring force from piston spring 4 also by piston 3 from housing 2 Outwardly biased, thus being biased to a span of this closed loop chain.Due to this chain wear, piston 3 must be from housing 2 In outwardly biased farther so that this chain of sufficiently tensioning.Due to needing more substantial fluid to increase spring force with by piston 3 Outwardly biased from housing 2, the part being provided to the fluid of hydraulic chamber 16 leaks in fluid chamber 14 and make can Moving sleeve 18 is displaced outwardly from housing 2.It should be noted that this displaceable sleeve 18 is mainly due to from source of supply 7 Oil, the oil rather than from hydraulic chamber 16 and be displaced outwardly.

Referring to Fig. 1 c, when this stretcher piece worn chain of tensioning during high chain load, in operating process In, this high power by piston 3 from Fig. 1 b shown in piston position inwardly promote towards housing 2（Indicated with dotted line）.Piston 3 to Interior power and motion are to be blocked by the fluid in fluid chamber 14, this is because the check-valves 10 in supply line 12 hinders Fluid leaves fluid chamber 14, thus being substantially pressurized fluid chamber 14.The supercharging of fluid chamber 14 causes removable The inward flange 22 of sleeve 18 passes through piston spring 4 and applies an outside power contrary with inward force to piston 3.Once from work Plug 3 removes this high capacity thus substantially chamber 14 reduces pressure, and source of supply 7 is just by check-valves 10 supply fluid and will flow Body is fed to this fluid chamber 14 to fill this fluid chamber 14 and sleeve 18 compensated with respect to the movement of piston 3 And maintain the position that sleeve 18 is with respect to piston 3.

The movement of displaceable sleeve 18 makes the second end 4b of piston spring 4 mobile thus piston 3 is outwards inclined from housing 2 Put, and the spring force therefore acting on piston 3 is variable and piston 3 is constantly by this chain tension, even if work as should Chain is also such when becoming and wearing and tearing and extend.

Multiple seals（Not shown）May reside between excircle flange 20 and displaceable sleeve 18 and hole 2a Any other place necessary between Second bobbin diameter part D2 and the first diameter D1 in hole or in this stretcher.

The hydraulic pressure rigidity of this stretcher be produced by the pressure chamber 16 of this stretcher and fluid chamber 14 and when should Piston 3 and displaceable sleeve 18 moving inward towards housing 2 is substantially prevented when chain span is under load.

Fig. 2 is shown and is moved the second of a displaceable sleeve being received by hollow piston 3 33 using supply pressure The stretcher of the passive tensioner system of embodiment.

One hollow displaceable sleeve 33 is received in the hole 2a of housing 2.Have received in hollow displaceable sleeve 33 The fixes sleeve 30 of one hollow.There is sleeve spring 5 in the fixes sleeve 30 of this hollow.First end 5a of this sleeve spring 5 Contact with the basal surface 36 of an inward flange 34 of displaceable sleeve 33, and the second end 5b of this sleeve spring 5 and hollow The basal surface 32 of an inward flange 31 of fixes sleeve 30 or hole 2a bottom（If flange 31）Contact. This sleeve spring 5 provide a bias force with reduce so that this displaceable sleeve 33 be maintained at respect to piston 3 desired Controling power required for position.Within the inside diameter portion 38 of fixes sleeve 30, the hollow of this hollow displaceable sleeve 33 A pressure chamber 16 is defined between the inside 3a of inside diameter portion 17 and piston 3.

The diameter that displaceable sleeve 33 has is substantially equal to the diameter of this Second bobbin diameter part D2 but still allows Moveable-jacket Cylinder 33 slides in the 2a of hole.Hole 2a bottom 2c, this fixes sleeve 30 and displaceable sleeve 33 a bottom end surface 39 it Between define a fluid chamber 37.This fluid chamber 37 is to comprise check-valves 10 with an oil pressure supply 7 by one Supply line 12 is being in fluid communication.This source of supply 7 is to fluid chamber 37 supply fluid to compensate be likely to occur any Leakage.This check-valves 10 prevents any fluid of this fluid chamber 37 from backing in this source of supply 7.It should be noted that not having Region supply fluid pressure between oriented piston 3, this displaceable sleeve 33 and Second bobbin diameter part D2 of hole 2a.

At least a portion of this displaceable sleeve 33 is slidably received within hollow piston 3.In hollow piston 3 Also there is one and make the outwardly biased piston spring from housing 2 of piston 34.This piston spring 4 has and hollow piston 3 First end 4a that interior section 3a contacts and contacting with the top surface 35 of the inward flange 34 of displaceable sleeve 33 One the second end 4b.One through hole 25 is present in inward flange 34 thus allowing fluid to flow into this piston from entrance supply line 6 Inside 3a and flow to displaceable sleeve 33 inward flange 34 top surface 35.

There may be an inlet non-return valve at the bottom of hole 2a（Not shown）And one be used for pressure chamber 16 The entrance supply line 6 of oil pressure is provided.To fluid chamber 37 provide fluid source of supply 7 can with to entrance supply line 6 There is provided the source of supply of fluid identical.Alternatively, can be with same fluid chamber 37 to the source of supply of entrance supply line 6 offer fluid This source of supply 7 being in fluid communication differs.Additionally, there may be an exhaust outlet or pressure release in hollow piston 3 Valve（Not shown）.

Similar to Fig. 1 a, when this stretcher is in a piece new chain of tensioning, in operation, fluid is from entrance supply pipe Line 6 and optionally by an inlet non-return valve（Not shown）And it is provided to this hydraulic chamber 16 so as to this hydraulic chamber 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.

When this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, fluid is from entering Mouthful supply line 6 and be provided to this hydraulic chamber 16 so as to this hydraulic chamber optionally by an inlet non-return valve 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.Due to this chain wear, piston 3 must be outwardly biased farther from housing 2 So that this chain of sufficiently tensioning.Similar to Fig. 1 b, due to need more substantial fluid to increase spring force so that piston 3 from Outwardly biased in housing 2, the part being provided to the fluid of hydraulic chamber 16 leaks to displaceable sleeve 33, fixes sleeve 30 In fluid chamber 37 and the hole 2a of housing between and so that displaceable sleeve 33 is displaced outwardly from housing 2.It should be noted that This displaceable sleeve is displaced outwardly mainly due to oil, the oil rather than from hydraulic chamber 16 from source of supply 7.

When this stretcher piece worn chain of tensioning during high chain load, in operation, this is high Power piston position shown in from Fig. 1 c for the piston 3 is inwardly promoted towards housing 2（Indicated with dotted line）.The inward force of piston 2 It is to be blocked by the fluid in fluid chamber 37 with motion, this is because the check-valves 10 in supply line 12 hinders fluid Leave fluid chamber 37, thus being substantially pressurized chamber 37.The supercharging of fluid chamber 37 causes the interior of displaceable sleeve 33 Flange 34 passes through this piston spring and applies an outside power contrary with inward force to piston 3.Once removing this from piston 3 Thus substantially chamber 37 reduces pressure, source of supply 7 is just by check-valves 10 supply fluid and supply fluid to for high capacity This fluid chamber 37 is to fill this fluid chamber 37 and sleeve 33 to be compensated with respect to the movement of piston 3 and maintains Sleeve 33 is with respect to the position of piston 3.

The movement of displaceable sleeve 33 makes the second end 4b of piston spring 4 mobile thus piston 3 is outwards inclined from housing 2 Put, and the spring force therefore acting on piston 3 is variable and piston 3 is constantly by this chain tension, even if work as should Chain is also such when becoming and wearing and tearing and extend.

Multiple seals（Not shown）May reside between displaceable sleeve 33 and Second bobbin diameter part D2 of hole 2a with And any other place necessary between Second bobbin diameter part D2 and the first diameter D1 in hole or in this stretcher.

The hydraulic pressure rigidity of this stretcher be produced by the pressure chamber 16 of this stretcher and fluid chamber 37 and when should Piston 3 and displaceable sleeve 33 moving inward towards housing 2 is substantially prevented when chain span is under load.

Fig. 3 shows the passive stretcher system of the 3rd embodiment moving a displaceable sleeve 40 using supply pressure The stretcher of system, this displaceable sleeve have received a hollow piston 3.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.One displaceable sleeve 40 are received in the hole 2a of housing 2.This displaceable sleeve 40 has an a first opening 46a and second opening 45a, should First opening is to be limited by a top inside diameter part 46 of central inward flange 41 and a top surface 43, and this second Opening is to be limited by a bottom inside diameter portion 45 of central inward flange 41 and a basal surface 42.Central inward flange 41 One through hole 47 connects the first opening 46a of displaceable sleeve 40 to the second opening 45a.One top table of displaceable sleeve 40 Face 48 is exposed under atmospheric pressure.

One hollow piston 3 is received in the first opening 46a of displaceable sleeve 40, and this first opening is by central authorities The top inside diameter part 46 of flange 41 and top surface 43 limit.There is one in hollow piston 3 and make piston 3 from housing Outwardly biased piston spring 4 in 2.This piston spring 4 has first contacting with the interior section 3a of hollow piston 3 Hold the second end 4b that 4a and the top surface 43 with the central inward flange 41 of displaceable sleeve 40 contact.

The fixes sleeve 30 of one hollow is received in the second opening 45a of displaceable sleeve 40, and this second opening is Limited by the bottom inside diameter portion 45 of central inward flange 41 and basal surface 42.There is sleeve in the fixes sleeve 30 of this hollow Spring 5.First end 5a of this sleeve spring 5 is contacted with the basal surface 42 of the central inward flange 41 of displaceable sleeve 40, and Second end 5b of this sleeve spring 5 is contacted with the basal surface 32 of an inward flange 31 of the fixes sleeve 30 of hollow.This sleeve Spring 5 provides a bias force to reduce so that this displaceable sleeve 40 is maintained at desired position institute with respect to piston 3 The controling power needing.In an interior section 38 of fixes sleeve 30 or the bottom in this hole（If flange 31）、 A pressure chamber is defined between the inside diameter portion 17 of the second opening 45a of this displaceable sleeve 40 and the inside 3a of piston 3 Room 16.Through hole 47 be present in allow in central inward flange 41 fluid from entrance supply line 6 flow into this piston inside 3a simultaneously And flow to the top surface 43 of the central inward flange 41 of displaceable sleeve 40.

Define one between the bottom of hole 2a, this fixes sleeve 30 and a bottom end surface 39 of displaceable sleeve 40 Fluid chamber 37.This fluid chamber 37 is by a supply line 12 comprising check-valves 10 with an oil pressure supply 7 It is in fluid communication.This check-valves 10 prevents any fluid of this fluid chamber 37 from backing in this source of supply 7.

Similar to Fig. 1 a, when this stretcher is in a piece new chain of tensioning, in operation, fluid is from entrance supply pipe Line 6 and be provided to this hydraulic chamber 16 to increase to this hydraulic chamber 16 optionally by an inlet non-return valve Press and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus to this closed loop chain One span of bar is biased.

When this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, fluid is from entering Mouthful supply line 6 and be provided to this hydraulic chamber 16 so as to this hydraulic chamber optionally by an inlet non-return valve 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.Due to this chain wear, piston 3 must be outwardly biased farther from housing 2 So that this chain of sufficiently tensioning.Similar to Fig. 1 b, due to need more substantial fluid to increase spring force with by piston 3 from shell Outwardly biased in body 2, the part being provided to the fluid of hydraulic chamber 16 leaks to displaceable sleeve 33 and fixes sleeve 30 Between fluid chamber 37 in and so that displaceable sleeve 40 is displaced outwardly from housing 2.It should be noted that this displaceable sleeve It is displaced outwardly mainly due to oil, the oil rather than from hydraulic chamber 16 from source of supply 7.

When this stretcher piece worn chain of tensioning during high chain load, in operation, this is high Power by piston 3 from Fig. 1 c shown in piston position inwardly promote towards this housing（Indicated with dotted line）.The inward force of this piston It is to be blocked by the fluid in fluid chamber 37 with motion, this is because the check-valves 10 in supply line 12 hinders fluid Leave fluid chamber 37, thus being substantially pressurized fluid chamber 37.The supercharging of fluid chamber 37 causes displaceable sleeve 40 Central inward flange 41 pass through piston spring 4 to piston 3 apply an outside power contrary with inward force.

Once removing this high capacity thus substantially chamber 37 reduces pressure from piston 3, source of supply 7 is just by check-valves 10 Supply fluid and supply fluid to this fluid chamber 37 to fill this fluid chamber 37 and to sleeve 40 with respect to piston 3 movement compensates and maintains the position that sleeve 40 is with respect to piston 3.

The movement of displaceable sleeve 40 makes the second end 4b of piston spring 4 mobile thus piston 3 is outwards inclined from housing 2 Put, and the spring force therefore acting on piston 3 is variable and piston 3 is constantly by this chain tension, even if work as should Chain is also such when becoming and wearing and tearing and extend.

Multiple seals（Not shown）May reside between hole 2a and this displaceable sleeve 40 or in this stretcher must Any other wanted is local.

The hydraulic pressure rigidity of this stretcher be produced by the pressure chamber 16 of this stretcher and fluid chamber 37 and when should Piston 3 and displaceable sleeve 40 moving inward towards housing 2 is substantially prevented when chain span is under load.

Fig. 4 shows that the move a displaceable sleeve being received by hollow piston 3 using supply pressure the 4th is real Apply the stretcher of the passive tensioner system of example.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has One inside carrying the first diameter portion D1 and Second bobbin diameter part D2, wherein Second bobbin diameter part D2 are more than the first diameter portion Divide D1.One hole flange 150 by Second bobbin diameter part D2 hole 2a, have received piston 3 and this hole, have received removable Another Second bobbin diameter part D2 of the excircle flange 141 of moving sleeve 140 is separately.

One displaceable sleeve 140 is received in the hole 2a of housing 2.This displaceable sleeve 140 be hollow and with The inside 3a of the hole 2a of housing 2, the inside diameter portion 17 of hollow displaceable sleeve 140 and piston 3 defines a pressure chamber Room 16.One sleeve spring 5 is present in the 2a of hole and is received in the inside diameter portion 17 of displaceable sleeve 140, wherein First end 5a of this spring 5 is contacted with a basal surface 147 of the inward flange 145 of this displaceable sleeve 140, and this spring 5 the second end 5b is contacted with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce so that this is removable Sleeve 140 is maintained at the controling power required for desired position with respect to piston 3.

Displaceable sleeve 140 has an excircle flange 141, and this excircle flange has a top with area A2 Surface 142 and a basal surface 143 with area A1.The area A2 of top surface 142 is less than the area A1 of basal surface 143.? A first fluid chamber is defined between the top surface 142 of this excircle flange 141 and the basal surface 152 of this hole flange 150 One is defined between 58, and another wall 73 of the basal surface 143 in this excircle flange 141 and this Second bobbin diameter part D2 Individual second fluid chamber 57.

This first fluid chamber 58 is connected to a source of supply 7 by pipeline 55, and this pipeline only preferably has one Return valve 53, and this second fluid chamber 57 is connected to a source of supply 7 by pipeline 56, this pipeline Preferably also has One check-valves 54.Check-valves 53,54 prevents any fluid in fluid chamber 58,57 from backing in this source of supply 7.This confession Answer source 7 to fluid chamber 58,57 supply fluids to compensate any leakage being likely to occur.

At least a portion before the excircle flange 141 of this displaceable sleeve 140 is slidably received hollow and lives Within plug 3.Also there is one and make the outwardly biased piston spring from housing 2 of piston 34 in hollow piston 3.This piston bullet Spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and the inward flange with displaceable sleeve 140 The second end 4b that 145 top surface 146 contacts.One through hole 144 be present in inward flange 145 thus allow fluid from Entrance supply line 6 flow into this piston inside 3a and flow to displaceable sleeve 140 inward flange 145 top surface 146.

There may be an inlet non-return valve at the bottom of hole 2a（Not shown）And one be used for pressure chamber 16 The entrance supply line 6 of oil pressure is provided.To fluid chamber 57,58 provide fluid source of supply 7 can with to entrance supply pipe Line 6 provides the source of supply of fluid identical.Alternatively, can be with same fluid cavity to the source of supply of entrance supply line 6 offer fluid This source of supply 7 that room 57,58 is in fluid communication differs.Additionally, there may be an exhaust outlet or pressure in hollow piston 3 Power relief valve（Not shown）.

When this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, fluid is from entering Mouthful supply line 6 and be provided to this hydraulic chamber 16 so as to this hydraulic chamber optionally by an inlet non-return valve 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.Due to this chain wear, piston 3 must be outwardly biased farther from housing 2 So that this chain of sufficiently tensioning.Due to needing more substantial fluid to increase spring force so that piston 3 is outwards inclined from housing 2 Put, the part being provided to the fluid of hydraulic chamber 16 leaks to the stream between displaceable sleeve 140 and the hole 2a of this housing In fluid chamber 57,58.It should be noted that this displaceable sleeve 140 mainly due to from source of supply 7 oil rather than come It is displaced outwardly from the oil of hydraulic chamber 16.It is somebody's turn to do because the area A1 that the basal surface 143 of this excircle flange 141 has is more than The area A2 of the top surface 142 of excircle flange 141, similar to Fig. 1 b, makes displaceable sleeve 140 in the opposite direction with chamber 58 Upper mobile phase ratio, chamber 57 needs less Fluid pressure so that displaceable sleeve 140 is displaced outwardly from housing.

When this stretcher piece worn chain of tensioning during high chain load, in operation, this is high Power by piston 3 from Fig. 1 c shown in piston position inwardly promote towards housing 2（Indicated with dotted line）.The inward force of this piston 3 It is to be blocked by the fluid in fluid chamber 57 with motion, this is because the check-valves 54 in supply line 56 hinders fluid Leave fluid chamber 57, thus being substantially pressurized fluid chamber 57.Additionally, the basal surface 143 in this excircle flange 141 Area A1 be more than this excircle flange 141 the area A2 of top surface 142 in the case of, the supercharging of fluid chamber 57 causes can " pumped " of the inward flange 145 of moving sleeve 33 or make displaceable sleeve 140 from housing 2 be displaced outwardly and pass through piston spring 4 are applied with the outside power of contrary with this inward force to piston 3.Once removing this high capacity thus essence from piston 3 Property ground fluid chamber 57 is reduced pressure, source of supply 7 is just by check-valves 54 supply fluid and supply fluid to this fluid chamber 57 to fill this fluid chamber 57 and sleeve 140 to be compensated with respect to the movement of piston 3 and maintains sleeve 140 phase Position for piston 3.

The movement of displaceable sleeve 140 makes the second end 4b of piston spring 4 mobile thus piston 3 is outside from housing 2 Biasing, and the spring force therefore acting on piston 3 is variable and piston 3 is constantly by this chain tension, even if working as This chain is also such when becoming and wearing and tearing and extend.

It should be noted that when fluid chamber 57 is in decompression, fluid chamber 58 is in supercharging.It is used for the stream from source of supply 7 Body makes this displaceable sleeve 140 mobile filling fluid chamber 57.This displaceable sleeve 140 moves out or more than in order to tie up Holding piston 3 with respect to stroke necessary to the position of chain is to be blocked by the fluid in fluid chamber 58, this is because supplying Answer the check-valves 53 in pipeline 55 to hinder fluid and leave fluid chamber 58, thus being substantially pressurized chamber 58.Once from This sleeve removes this load, and chamber 58 just reduces pressure and source of supply 7 is just supplied by check-valves 53 supply fluid and by fluid To this fluid chamber 58 to fill this fluid chamber 58 and sleeve 140 to be compensated with respect to the movement of piston 3 and ties up Holding sleeve 140 is with respect to the position of piston 3, but regardless of how acting on other power on sleeve.

Multiple seals（Not shown）May reside between hole 2a and this displaceable sleeve 140 or in this stretcher must Any other wanted is local.

The hydraulic pressure rigidity of this stretcher is produced and worked as by the pressure chamber 16 of this stretcher and fluid chamber 57,58 Piston 3 and displaceable sleeve 140 moving inward towards housing 2 is substantially prevented when this chain span is under load.

Fig. 5 shows the 5th embodiment that moves a displaceable sleeve being received by piston using supply pressure The stretcher of passive tensioner system.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.One displaceable sleeve 163 are received in the hole 2a of housing 2.This displaceable sleeve 163 is hollow and the hole 2a with housing 2, hollow may move The inside 3a of the inside diameter portion 169 of sleeve 163 and piston 3 defines a pressure chamber 16.

One sleeve spring 5 is present in the 2a of hole and is received in the inside diameter portion 169 of displaceable sleeve 163, Wherein first end 5a of this spring 5 is contacted with a basal surface 166 of the inward flange 164 of this displaceable sleeve 163, and should Second end 5b of spring 5 is contacted with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce so that this can Moving sleeve 163 is maintained at the controling power required for desired position with respect to piston 3.

There is a circumferential notch 168 outer circumference along displaceable sleeve 163.The cutting of displaceable sleeve 163 Mouth 168 is slideably received within a hole flange 160.This hole flange 160 has a top surface 161 with area A1 and one There is the basal surface 162 of area A2.The area A1 of the top surface 161 of hole flange 160 is more than the basal surface 162 of hole flange 160 Area A2.

Define one between the top surface 161 of this hole flange 160 and otch 168 surface of this displaceable sleeve 163 First fluid chamber 58, and the basal surface 162 in this hole flange 160 and the otch 168 of this displaceable sleeve 163 another A second fluid chamber 57 is defined between surface.This first fluid chamber 58 is connected to a source of supply 7 by pipeline 55 On, this pipeline preferably has a check-valves 53, and this second fluid chamber 57 is connected to a supply by pipeline 56 On source 7, this pipeline Preferably also has a check-valves 54.Check-valves 53,54 prevents any stream in fluid chamber 58,57 Body backs in this source of supply 7.Source of supply 7 is to fluid chamber 57,58 supply fluids to compensate any leakage of appearance.

At least a portion before otch 168 of this displaceable sleeve 163 be slidably received hollow piston 3 it Interior.Also there is one and make the outwardly biased piston spring from housing 2 of piston 34 in hollow piston 3.This piston spring 4 has There are first end 4a contacting with the inside 3a of hollow piston 3 and the top table with the inward flange 164 of displaceable sleeve 163 The second end 4b that face 165 contacts.One through hole 144 is present in inward flange 164 thus allowing fluid from entrance supply Pipeline 6 flow into this piston inside 3a and flow to displaceable sleeve 163 inward flange 164 top surface 165.

When this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, fluid is from entering Mouthful supply line 6 and be provided to this hydraulic chamber 16 so as to this hydraulic chamber optionally by an inlet non-return valve 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.Due to this chain wear, piston 3 must be outwardly biased farther from housing 2 So that this chain of sufficiently tensioning.Due to needing more substantial fluid to increase spring force so that piston 3 is outwards inclined from housing 2 Put, the part being provided to the fluid of hydraulic chamber 16 leaks to the stream between displaceable sleeve 163 and the hole 2a of this housing In fluid chamber 57,58.Because the area A1 that the top surface 161 of this hole flange 160 has is more than the basal surface of this hole flange 160 162 area A2, similar to Fig. 1 b, compared with chamber 57, chamber 58 needs less Fluid pressure to make displaceable sleeve 163 It is displaced outwardly from housing.It should be noted that this displaceable sleeve 163 mainly due to from source of supply 7 oil rather than come It is displaced outwardly from the oil of hydraulic chamber 16.

When this stretcher piece worn chain of tensioning during high chain load, in operation, this is high Power piston position shown in from Fig. 1 c for the piston 3 is inwardly promoted towards housing 2（Indicated with dotted line）.The inward force of piston 3 It is to be blocked by the fluid in fluid chamber 58 with motion, this is because the check-valves 53 in supply line 55 hinders fluid Leave fluid chamber 58, thus being substantially pressurized chamber 58.Additionally, the area A1 in the top surface 161 of hole flange 160 is big In the case of the area A2 of the basal surface 162 of this hole flange 160, the supercharging of fluid chamber 58 causes displaceable sleeve 163 " pumped " of inward flange 164 or be displaced outwardly from housing 2 and be applied with and this inward force to piston 3 by piston spring 4 A contrary outside power.Once removing this high capacity thus substantially chamber 58 reduces pressure from piston 3, source of supply 7 is just By check-valves 53 supply fluid and supply fluid to this fluid chamber 58 and fill this fluid chamber 58 and to sleeve 163 compensate and maintain the position that sleeve 163 is with respect to piston 3 with respect to the movement of piston 3.

The movement of displaceable sleeve 163 makes the second end 4b of piston spring 4 mobile thus piston 3 is outside from housing 2 Biasing, and the spring force therefore acting on piston 3 is variable and piston 3 is constantly by this chain tension, even if working as This chain is also such when becoming and wearing and tearing and extend.

It should be noted that when fluid chamber 58 is in decompression, fluid chamber 57 is in supercharging.It is used for the stream from source of supply 7 Body makes this displaceable sleeve 163 mobile filling fluid chamber 58.This displaceable sleeve 163 moves out or more than in order to tie up Holding piston 3 with respect to stroke necessary to the position of chain is to be blocked by the fluid in fluid chamber 57, this is because supplying Answer the check-valves 54 in pipeline 56 to hinder fluid and leave fluid chamber 57, thus being substantially pressurized chamber 57.Once from This sleeve removes this load, fluid chamber 57 just decompression and source of supply 7 just by check-valves 54 supply fluid and by fluid It is fed to this fluid chamber 57 to fill this chamber 57 and sleeve 163 to be compensated with respect to the movement of piston 3 and ties up Holding sleeve 163 is with respect to the position of this piston, but regardless of how acting on other power on sleeve.

Multiple seals（Not shown）May reside between hole 2a and this displaceable sleeve 163 or in this stretcher must Any other wanted is local.

The hydraulic pressure rigidity of this stretcher is produced by the chamber 16 of this stretcher and fluid chamber 57,58 and works as this chain Piston 3 and displaceable sleeve 163 moving inward towards housing 2 is substantially prevented when bar span is under load.

Fig. 6 shows and moves a displaceable sleeve being received by piston using internal pressure region and flange pressure Sixth embodiment passive tensioner system.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.One displaceable sleeve 80 are received in the hole 2a of housing 2.This displaceable sleeve 80 has an a first opening 89a and second opening 96a, should First opening is to be limited by a top inside diameter part 89 of central flange 82 and a top surface 81, and this second is opened Mouth is to be limited by a bottom inside diameter portion 96 of central inward flange 82 and a basal surface 83.The one of central inward flange 82 Individual through hole 97 connects the first opening 89a of displaceable sleeve 80 to the second opening 96a.One top surface of displaceable sleeve 80 Under 98 atmospheric pressures being exposed to this engine.

One hollow piston 3 is received in the first opening 89a of displaceable sleeve 80, and this first opening is by central authorities The top inside diameter part 89 of flange 82 and top surface 81 limit.There is one in hollow piston 3 and make piston 3 from housing Outwardly biased piston spring 4 in 2.This piston spring 4 has first contacting with the interior section 3a of hollow piston 3 Hold the second end 4b that 4a and the top surface 81 with the central inward flange 82 of displaceable sleeve 80 contact.

One sleeve spring 5 is received in the second opening 96a of displaceable sleeve 80, and this second opening is by central authorities The bottom inside diameter portion 96 of flange 82 and basal surface 83 limit.First end 5a of this sleeve spring 5 and displaceable sleeve 80 The basal surface 83 of central flange 82 contact, and the second end 5b of this sleeve spring 5 is contacted with the bottom 2c of hole 2a.Should Sleeve spring 5 provides a bias force to reduce so that this displaceable sleeve 80 is maintained at desired position with respect to piston 3 Controling power required for putting.The top inside diameter part 89 of sleeve 80, the bottom inside diameter portion 96 of sleeve 80, housing hole A pressure chamber 16 is defined between the inside 3a of 2a and this piston.Through hole 97 is present in central inward flange 81 and permits Permitted fluid to flow out from entrance supply line 6 and flow to the first opening 89a from the second opening 96a.

There may be an inlet non-return valve at the bottom of hole 2a（Not shown）And one be used for pressure chamber 16 The entrance supply line 6 of oil pressure is provided.To fluid chamber 94,95 provide fluid source of supply 7 can with to entrance supply pipe Line 6 provides the source of supply of fluid identical.Alternatively, can be with same fluid cavity to the source of supply of entrance supply line 6 offer fluid This source of supply 7 that room 94,95 is in fluid communication differs.Additionally, there may be an exhaust outlet or pressure in hollow piston 3 Power relief valve（Not shown）.

Displaceable sleeve 80 has an excircle flange 84, and this excircle flange is substantially equal to Second bobbin diameter part D2 Width, but allow flange 84 to slide in Second bobbin diameter part D2 of hole 2a and form a first fluid chamber 95 and Individual second fluid chamber 94.This first fluid chamber 95 is connected to a source of supply 7 by pipeline 93, and this pipeline preferably has There is a check-valves 92, and this second fluid chamber 94 is connected to a source of supply 7 by pipeline 91, this pipeline is equally excellent Selection of land has a check-valves 90.Check-valves 92,90 prevents any fluid in fluid chamber 95,94 from backing into this source of supply In 7.Source of supply 7 when necessary to fluid chamber 94,95 supply fluids to compensate to leakage.Displaceable sleeve 80 is outside Overall diameter under circumferential flange 84 is received by first diameter portion D1 of hole 2a, and this Second bobbin diameter part D2 is more than should First diameter portion D1.

When this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, fluid is from entering Mouthful supply line 6 and be provided to this hydraulic chamber 16 so as to this hydraulic chamber optionally by an inlet non-return valve 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.Due to this chain wear, piston 3 must be outwardly biased farther from housing 2 So that this chain of sufficiently tensioning.Similar to Fig. 1 a, due to need more substantial fluid to increase spring force with by piston 3 from shell Outwardly biased in body 2, the part being provided to the fluid of hydraulic chamber 16 leaks to the hole 2a of displaceable sleeve 80 and housing Between fluid chamber 94,95 in, and the basal surface on a basal surface 99 of sleeve 80 and in central inward flange 82 The Fluid pressure in chamber 16 on 83 makes sleeve 80 be displaced outwardly from this housing.It should be noted that this displaceable sleeve master If being displaced outwardly due to oil, the oil rather than from hydraulic chamber 16 from source of supply.

When this stretcher piece worn chain of tensioning during high chain load, in operation, this is high Power by piston 3 from Fig. 1 c shown in piston position inwardly promote towards housing 2（Indicated with dotted line）.The inward force of this piston and Motion is to be blocked by the fluid in fluid chamber 94, this is because the check-valves 90 in supply line 91 hinder fluid from Open fluid chamber 94, thus being substantially pressurized chamber 94.In addition to the pressure on the basal surface 99 of displaceable sleeve 80, The supercharging of fluid chamber 94 also causes the central inward flange 82 of displaceable sleeve 80 to pass through piston spring 4 to piston 3 applying one The outside power contrary with this inward force.Once removing this high capacity thus substantially chamber 94 reduces pressure from piston 3, supply Answer source 7 just by check-valves 10 supply fluid and supply fluid to this fluid chamber 94 fill this fluid chamber 94 and And sleeve 80 is compensated with respect to the movement of piston 3 and maintains with the position that sleeve 80 is with respect to piston 3.

The movement of displaceable sleeve 80 makes the second end 4b of piston spring 4 mobile thus piston 3 is outwards inclined from housing 2 Put, and the spring force therefore acting on piston 3 is variable and piston 3 is constantly by this chain tension, even if work as should Chain is also such when becoming and wearing and tearing and extend.

It should be noted that when fluid chamber 94 is in decompression, fluid chamber 95 is in supercharging.It is used for the stream from source of supply 7 Body makes this displaceable sleeve 80 mobile filling fluid chamber 94.This displaceable sleeve moves out or more than in order to remain alive Plug 3 is to be blocked by the fluid in fluid chamber 95 with respect to stroke necessary to the position of chain, this is because supply pipe Check-valves 92 in line 93 hinders fluid and leaves fluid chamber 95, thus being substantially pressurized chamber 95.Once from this set Cylinder 80 removes this load, chamber 95 just decompression and source of supply 7 just by check-valves 92 supply fluid and supply fluid to This fluid chamber 95 is to fill this fluid chamber 95 and sleeve 80 to be compensated with respect to the movement of piston 3 and maintains Sleeve 80 is with respect to the position of piston 3, but regardless of how acting on other power on sleeve.

Multiple seals（Not shown）May reside between hole 2a and this displaceable sleeve 80 or in this stretcher must Any other wanted is local.

The hydraulic pressure rigidity of this stretcher is produced and worked as by the pressure chamber 16 of this stretcher and fluid chamber 94,95 Piston 3 and displaceable sleeve 80 moving inward towards housing 2 is substantially prevented when this chain span is under load.

Fig. 7 shows the stretcher of the passive tensioner system of the 7th embodiment.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has One inside carrying the first diameter portion D1 and Second bobbin diameter part D2, wherein Second bobbin diameter part D2 are more than the first diameter portion Divide D1.One hole flange 52 by Second bobbin diameter part D2 hole 2a, have received piston 3 and this hole, have received removable Another Second bobbin diameter part D2 of the excircle flange 20 of moving sleeve 18 is separately.

One displaceable sleeve 18 is received in the hole 2a of housing.This displaceable sleeve 18 is hollow and and housing 2 hole 2a, the inside diameter portion 17 of hollow displaceable sleeve 18 and piston 3 be internally formed a pressure chamber 16.One Individual sleeve spring 5 is present in the 2a of hole and is received in the inside diameter portion 17 of displaceable sleeve 18, wherein this spring 5 First end 5a is contacted with a basal surface 24 of the inward flange 22 of this displaceable sleeve 18, and the second end 5b of this spring 5 Contact with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce so that this displaceable sleeve 18 is relative It is maintained at the controling power required for desired position in piston 3.

Displaceable sleeve 18 has an excircle flange 20, and this excircle flange has a top surface 29 and a bottom Surface 27.This excircle flange 20 by Second bobbin diameter part D2 of housing 2 divide into the first and second fluid chamber 58, 57.Define a first fluid chamber between the top surface 20 and the basal surface 51 of this hole flange 52 of this excircle flange 29 One is defined between 58, and another wall 73 of the basal surface 27 in this excircle flange 20 and this Second bobbin diameter part D2 Second fluid chamber 57.

This first fluid chamber 58 is connected on a source of supply 7 by pipeline 101 and a control valve 108.This Two fluid chamber 57 are connected on a source of supply 7 by pipeline 100 and control valve 108.Source of supply 7 is only to fluid chamber 57th, 58 leakage is supplemented and to these chamber supply fluids.Control valve 108 is preferably guiding valve, including a valve element 109, This valve element has at least two cylindrical boss 109a, 109b being slidably received in a hole 106.Hole 106 can position In stretcher housing 2 or be positioned within the engine away from stretcher housing.One end of this valve element makes this valve element exist with one The spring 110 of first direction upper offset contacts.

At least a portion before outer circumferential flange 20 of this displaceable sleeve 18 is slidably received hollow and lives Within plug 3.Also there is one and make the outwardly biased piston spring from housing 2 of piston 34 in hollow piston 3.This piston bullet Spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and the inward flange with displaceable sleeve 18 The second end 4b that 22 top surface 26 contacts.One through hole 47 is present in inward flange 22 thus allowing fluid from entrance Supply line 6 flow into this piston inside 3a and flow to displaceable sleeve 18 inward flange 22 top surface 26.

When this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, fluid is from entering Mouthful supply line 6 and be provided to this hydraulic chamber 16 so as to this hydraulic chamber optionally by an inlet non-return valve 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.Due to this chain wear, piston 3 must be outwardly biased farther from housing 2 So that this chain of sufficiently tensioning.Similar to Fig. 1 b, due to need more substantial fluid to increase spring force so that piston 3 from Outwardly biased in housing 2, the part being provided to the fluid of hydraulic chamber 16 leaks to displaceable sleeve 18 and this housing In fluid chamber 57,58 between the 2a of hole and so that displaceable sleeve 18 is displaced outwardly from this housing.

When this stretcher piece worn chain of tensioning during high chain load, in operation, this is high Power piston position shown in from Fig. 1 c for the piston 3 is inwardly promoted towards this housing（Indicated with dotted line）.The inward force of piston 3 It is to be blocked by the fluid in fluid chamber 57 with motion, this is because the spring force from spring 110 on guiding valve 108 will Boss 109a is positioned at and hinders fluid and leave fluid chamber 57 with respect in a position of pipeline 100, thus substantive Chamber 57 is pressurized by ground.The supercharging of fluid chamber 57 cause displaceable sleeve 40 central inward flange 22 pass through piston spring 4 to Piston 3 applies an outside power contrary with inward force.Once removing this high capacity thus substantially by chamber from piston 3 Reduce pressure in room 57, source of supply 7 just supplies a fluid to this fluid chamber 57 and to sleeve 40 with respect to piston 3 by guiding valve 108 Movement compensates and maintains the position that sleeve 40 is with respect to piston 3.

It should be noted that when fluid chamber 57 is in decompression, fluid chamber 58 is in supercharging.It is used for the stream from source of supply 7 Body makes this displaceable sleeve 18 mobile filling fluid chamber 57.This displaceable sleeve 18 moves out or more than in order to maintain Piston 3 is to be blocked by the fluid in fluid chamber 58 with respect to stroke necessary to the position of chain, this is because guiding valve 108 hinder fluid leaves fluid chamber 58, thus being substantially pressurized chamber 58.Once removing this load from this sleeve, Chamber 58 just decompression and source of supply 7 just by guiding valve 108 supply fluid and supply fluid to this fluid chamber 58 and fill out Fill this fluid chamber 58 and sleeve 18 is compensated with respect to the movement of piston 3 and maintains sleeve 18 with respect to piston 3 Position, but regardless of how acting on other power on sleeve.

Multiple seals（Not shown）May reside between hole 2a and this displaceable sleeve 18 or in this stretcher must Any other wanted is local.

The hydraulic pressure rigidity of this stretcher is produced by the chamber 16 of this stretcher and pressure chamber 57,58 and works as this chain Piston 3 and displaceable sleeve 40 moving inward towards housing 2 is substantially prevented when bar span is under load.

Fig. 8 is an alternate embodiment of Fig. 7, and wherein control valve 108 is to be in fluid communication with a holder 114 's.This holder 114 also with the hole 2a by housing 2, the inside diameter portion 17 of hollow displaceable sleeve 18 and piston 3 in The pressure chamber 16 that portion 3a is formed is in fluid communication by a check-valves 125.This holder 114 stores or accumulates and is derived from The fluid of this pressure chamber 16 and be supplied to fluid chamber 57,58 under leak case.

One displaceable sleeve 18 is received in the hole 2a of housing.This displaceable sleeve 18 is hollow and and housing The inside diameter portion 17 of 2 hole 2a, the inside of piston 3 and hollow displaceable sleeve 18 defines a pressure chamber 16.One Individual sleeve spring 5 is present in the 2a of hole and is received in the inside diameter portion 17 of displaceable sleeve 18, wherein this spring 5 First end 5a is contacted with a basal surface 24 of the inward flange 22 of this displaceable sleeve 18, and the second end 5b of this spring 5 Contact with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce so that this displaceable sleeve 18 is relative It is maintained at the controling power required for desired position in piston 3.

This first fluid chamber 58 is connected to a holder 114 by pipeline 101, control valve 108 and pipeline 112 On.This second fluid chamber 57 is connected on holder 114 by pipeline 100, control valve 108 and pipeline 112.Holder 114 are only to the purposes supplemented of leakage to chamber 57,58 supply fluids.Control valve 108 is preferably guiding valve, including one Valve element 109, this valve element has at least two cylindrical boss 109a, 109b being slidably received in a hole 106.Hole 106 may be located in stretcher housing 2 or are positioned within the engine away from stretcher housing.One end of this valve element is made with one The spring 110 of this guiding valve upper offset in a first direction contacts.

There may be an inlet non-return valve at the bottom of hole 2a（Not shown）And one be used for pressure chamber 16 The entrance supply line 6 of oil pressure is provided.Additionally, there may be an exhaust outlet or pressure relief valve in hollow piston 3（Not Illustrate）.

When this stretcher piece worn chain of tensioning in the case of no high capacity, in operation, fluid is from entering Mouthful supply line 6 and be provided to this hydraulic chamber 16 so as to this hydraulic chamber optionally by an inlet non-return valve 16 are pressurized and also that piston 3 is outwardly biased from housing 2 in addition to the spring force from piston spring 4, thus right One span of this closed loop chain is biased.Due to this chain wear, piston 3 must be outwardly biased farther from housing 2 So that this chain of sufficiently tensioning.Similar to Fig. 1 b, due to need more substantial fluid to increase spring force with by piston 3 from shell Outwardly biased in body 2, the part being provided to the fluid of hydraulic chamber 16 leaks to the hole of displaceable sleeve 18 and this housing In fluid chamber 57,58 between 2a and so that displaceable sleeve 18 is displaced outwardly from this housing.

When this stretcher piece worn chain of tensioning during high chain load, in operation, this is high Power piston position shown in from Fig. 1 c for the piston 3 is inwardly promoted towards this housing（Indicated with dotted line）.This piston inside Power and motion are to be blocked by the fluid in fluid chamber 57, this be due on guiding valve 108 from the spring force of spring 110 Boss 109a is positioned at and hinders fluid and leave fluid chamber 57 with respect in a position of pipeline 100, thus essence Property ground chamber 57 is pressurized.The supercharging of fluid chamber 57 causes the central inward flange 22 of displaceable sleeve 40 to pass through piston spring 4 Apply an outside power contrary with inward force to piston 3.Once removing this high capacity thus substantially will from piston 3 Chamber 57 reduces pressure, holder 114 just by guiding valve 108 supply fluid to fluid chamber 57 fill this fluid chamber 57 and And sleeve 40 is compensated with respect to the movement of piston 3.

It should be noted that when fluid chamber 57 is in decompression, fluid chamber 58 is in supercharging.It is used for the stream from source of supply 7 Body makes this displaceable sleeve 40 mobile filling fluid chamber 57.This displaceable sleeve 40 moves out or more than in order to maintain Piston 3 is to be blocked by the fluid in fluid chamber 58 with respect to stroke necessary to the position of chain, this is because guiding valve 108 hinder fluid leaves fluid chamber 58, thus being substantially pressurized chamber 57.Once removing this load from piston 3, stream Fluid chamber 58 just reduces pressure and fluid chamber 57 is then pressurized.

Fig. 9 shows the active stretcher control system of the 9th embodiment.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has One inside carrying the first diameter portion D1 and Second bobbin diameter part D2, wherein Second bobbin diameter part D2 are more than the first diameter portion Divide D1.One hole flange 52 by Second bobbin diameter part D2 hole 2a, have received piston 3 and this hole, have received removable Another Second bobbin diameter part D2 of the excircle flange 20 of moving sleeve 18 passes through a check-valves 125 separately.

One displaceable sleeve 18 is received in the hole 2a of housing 2.This displaceable sleeve 18 is hollow and and shell The inside diameter portion 17 of the hole 2a of body 2, the inside 3a of piston 3 and hollow displaceable sleeve 18 defines a pressure chamber 16.One sleeve spring 5 is present in the 2a of hole and is received in the inside diameter portion 17 of displaceable sleeve 18, wherein this bullet First end 5a of spring 5 is contacted with a basal surface 24 of the inward flange 22 of this displaceable sleeve 18, and the second of this spring 5 End 5b is contacted with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce this displaceable sleeve 18 phase Controling power required for desired position is maintained at for piston 3.

Displaceable sleeve 18 has an excircle flange 20, and this excircle flange has a top surface 29 and a bottom Surface 27.This excircle flange 20 by Second bobbin diameter part D2 of housing 2 divide into the first and second fluid chamber 58, 57.Define a first fluid chamber between the top surface 20 and the basal surface 51 of this hole flange 50 of this excircle flange 29 One is defined between 58, and another wall 73 of the basal surface 27 in this excircle flange 20 and this Second bobbin diameter part D2 Second fluid chamber 57.

This first fluid chamber 58 is in stream by pipeline 101, control valve 108 and pipeline 112 with a holder 114 Body connects.This second fluid chamber 57 is in fluid even by pipeline 100, control valve 108 and pipeline 112 with holder 114 Logical.This holder 114 is preferably formed with the inside diameter portion 17 of the hole 2a by housing 2 and hollow displaceable sleeve 18 Pressure chamber 16 is in fluid communication.

Control valve 108 is preferably guiding valve, and including a valve element 109, this valve element has and is slidably received in a hole 106 At least two interior cylindrical boss 109a, 109b, these boss can hinder or allow from holder 114 to fluid chamber 57th, 58 flowing.Hole 106 may be located in stretcher housing 2 or is positioned within the engine away from stretcher housing.Control valve 108 one end is contacted with an actuator 116.In this embodiment, actuator 116 be position set actuator or One ad-hoc location of linear actuators, wherein this control valve 108 of this actuator set.In an alternative embodiment, activate Device 116 can also be a power actuator, exist strong wherein on the side of this control valve.If it should be noted that caused Dynamic device 116 is a power actuator, then will there is a spring on the opposition side that control valve is affected by this actuator 116.

This actuator is controlled by a controller 118, and this controller receives from a set point algorithm or mapping collection of illustrative plates 124 One set point input 122.This controller 118 is also via a sensor（Not shown）Receive the displaceable sleeve of this stretcher 18 position feedback 120.This set point algorithm or mapping collection of illustrative plates 124 are from different engine parameter 126 receives inputs, this parameter It is such as but not limited to cam timing, engine speed, air throttle, temperature, run time and tensioner position.

At least a portion before outer circumferential flange 20 of this displaceable sleeve 18 is slidably received hollow and lives Within plug 3.Also there is one and make the outwardly biased piston spring from housing 2 of piston 34 in hollow piston 3.This piston bullet Spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and the inward flange with displaceable sleeve 18 The second end 4b that 22 top surface 26 contacts.One through hole 47 is present in inward flange 22 thus allowing fluid from entrance Supply line 6 flows to the interior section 3a of piston 3.

In operation, fluid is supplied from entrance supply line 6 and optionally by an inlet non-return valve To this hydraulic chamber 16 so as to this hydraulic chamber 16 and the chamber 9 that formed in the interior section 3a of piston carry out being pressurized, And this piston is outwardly biased from housing 2 by the spring force from piston spring 4, thus to this closed loop chain Span is biased.

One sensor（Not shown）The position feedback 120 of displaceable sleeve 18 is provided to this controller 118.This controller 118 by the position feedback of this displaceable sleeve and from this set point algorithm or map collection of illustrative plates based on different engine parameters 126 124 set point 122 is compared.

If the position of this displaceable sleeve 18 is equal with set point 122, control valve 108 be not moved or activate and These boss 109a, 109b hinder fluid to flow to fluid chamber 57,58 from holder 114.Further, since not to fluid cavity Room 57,58 is added or removing fluids, therefore maintains the position that displaceable sleeve 18 is with respect to the hole 2a of piston 3 and housing.

If the position of this displaceable sleeve 18 is unequal with set point 122, control valve 108 is activated by actuator 116 To a following position, in this position, fluid flow to fluid chamber 57,58 so that Moveable-jacket from holder 114 Cylinder 18 moves with respect to the hole 2a of piston 3 and housing.The movement of displaceable sleeve 18 make piston spring 4 with removable The second end 4b that the top surface 26 of the inward flange 22 of sleeve 18 contacts is moved, thus piston 3 is outwards inclined from housing 2 Put and with chain or belt（Not shown）A span contacted.In the piston that piston 3 is outwardly biased from housing 2 Second end 4b of spring 4 be movably in the case of, act on the spring force on piston 3 be variable and piston 3 constantly By this chain tension, even if being also such when this chain becomes and weares and teares and extend.

The hydraulic pressure rigidity of stretcher is produced by the chamber 16 of this stretcher and fluid chamber 57,58 and works as this chain Piston 3 and displaceable sleeve 18 moving inward towards housing 2 is substantially prevented when span is under load.

Figure 10 shows the active control tensioner system of the tenth embodiment.

This stretcher includes a housing 2, and this housing has an axially extended piston hole 2a.One displaceable sleeve 80 are received in the hole 2a of housing 2.This displaceable sleeve 80 has an a first opening 89a and second opening 96a, should First opening is to be limited by a top inside diameter part 89 of central inward flange 81 and a top surface 82, and this second Opening is to be limited by a bottom inside diameter portion 96 of central inward flange 81 and a basal surface 83.Central inward flange 81 One through hole 97 connects the first opening 89a of displaceable sleeve 80 to the second opening 96a.Displaceable sleeve 80 also has one Top surface 98.

One hollow piston 3 is received in the first opening 89a of displaceable sleeve 80, and this first opening is by central authorities The top inside diameter part 89 of flange 81 and top surface 82 limit.There is one in hollow piston 3 and make piston 3 from housing Outwardly biased piston spring 4 in 2.This piston spring 4 has first contacting with the interior section 3a of hollow piston 3 Hold the second end 4b that 4a and the top surface 82 with the central inward flange 81 of displaceable sleeve 80 contact.

One sleeve spring 5 is received in the second opening of displaceable sleeve 80, and this second opening is by central convex The bottom interior surface 96 of edge 81 and basal surface 83 limit.First end 5a of this sleeve spring 5 and the central authorities of displaceable sleeve 80 The basal surface 83 of inward flange 81 contacts, and the bottom connection of the second end 5b and hole 2a of this sleeve spring 5 touches.This sleeve bullet Spring 5 provides a bias force to reduce so that this displaceable sleeve 80 is maintained at needed for desired position with respect to piston 3 The controling power wanted.Displaceable sleeve 80 the first and second openings 89,96, define between the hole 2a and inside 3a of piston 3 One pressure chamber 16.Through hole 97 be present in central inward flange 81 allow fluid from entrance supply line 6 flow into this piston Inside 3a and flow to displaceable sleeve 80 central inward flange 81 top surface 82.

There may be an inlet non-return valve at the bottom 2c of hole 2a（Not shown）And one be used for pressure chamber The entrance supply line 6 of 16 offer oil pressures.Additionally, there may be an exhaust outlet or pressure relief valve in hollow piston 3 （Not shown）.

Displaceable sleeve 80 has an excircle flange 84, and this excircle flange is substantially equal to Second bobbin diameter part D2 Width, but allow flange 84 to slide in Second bobbin diameter part D2 of hole 2a and form a first fluid chamber 95 and Individual second fluid chamber 94.This first fluid chamber 95 is connected to a storage by pipeline 101, control valve 108 and pipeline 112 On storage 114.This second fluid chamber 94 is connected on holder 114 by pipeline 100, control valve 108 and pipeline 112. This holder 114 preferably bottom interior surface 96a institute with the hole 2a by housing 2 and the second opening 96 of displaceable sleeve 80 The pressure chamber 16 being formed is in fluid communication by a check-valves 125.

Control valve 108 is preferably guiding valve, and including a valve element 109, this valve element has and is slidably received in a hole 106 At least two interior cylindrical boss 109a, 109b, these boss can hinder or allow from holder 114 to fluid chamber 94th, 95 flowing.Hole 106 may be located in stretcher housing 2 or is positioned within the engine away from stretcher housing.Control valve 108 one end is contacted with an actuator 116.In this embodiment, actuator 116 be position set actuator or Linear actuators, wherein this this control valve of actuator set a ad-hoc location.In an alternative embodiment, actuator 116 can also be a power actuator, exist strong wherein on the side of this control valve.If it should be noted that activated Device 116 is a power actuator, then will there is a spring on the opposition side that control valve is affected by this actuator 116.

This actuator position is controlled by a controller 118, and this controller is from a set point logic or mapping collection of illustrative plates 124 Receive a set point input 122.This controller 118 is also via a sensor（Not shown）Receive the removable of this stretcher The position feedback 120 of sleeve 80.This set point logic or mapping collection of illustrative plates 124, should from different engine parameter 126 receives inputs Parameter is such as but not limited to cam timing, engine speed, air throttle, temperature, run time and tensioner position.

In operation, fluid is supplied from entrance supply line 6 and optionally by an inlet non-return valve To this hydraulic chamber 16 to carry out to this hydraulic chamber 16 being pressurized and by the spring force from piston spring 4, this being lived Plug is outwardly biased from housing 2, thus being biased to a span of this closed loop chain.

One sensor（Not shown）The position feedback 120 of displaceable sleeve 80 is provided to this controller 118.This controller 118 by the position feedback of this displaceable sleeve and from this set point algorithm or map collection of illustrative plates based on different engine parameters 126 124 set point 122 is compared.

If the position of this displaceable sleeve 80 is equal with set point 122, control valve 108 be not moved or activate and These boss 109a, 109b hinder fluid to flow to fluid chamber 94,95 from holder 114.Further, since not to fluid cavity Room 94,95 is added or removing fluids, therefore maintains the position that displaceable sleeve 80 is with respect to the hole 2a of piston 3 and housing.

If the position of this displaceable sleeve 80 is unequal with set point 122, control valve 108 by actuator be actuated into as Under a position, in this position, fluid flow to fluid chamber 94,95 so that displaceable sleeve 80 from holder 114 Move with respect to the hole 2a of piston 3 and housing.That the movement of displaceable sleeve 80 makes piston spring 4 and displaceable sleeve The second end 4b that the top surface 81 of 80 central inward flange 81 contacts is moved, thus piston 3 is outwards inclined from housing 2 Put and with chain or belt（Not shown）A span contacted.In the piston that piston 3 is outwardly biased from housing 2 Second end 4b of spring 4 be movably in the case of, act on the spring force on piston 3 be variable and piston 3 constantly By this chain tension, even if being also such when this chain becomes and weares and teares and extend.

The hydraulic pressure rigidity of stretcher is produced by the chamber 16 of this stretcher and fluid chamber 94,95 and works as this chain Piston 3 and displaceable sleeve 80 moving inward towards housing 2 is substantially prevented when span is under load.

It is therefore understood that embodiments of the invention described herein are only saying to the application of the principles of the present invention Bright.The details of embodiment described is not intended to limit the scope of claim referred in this, and these claims itself are quoted from It is considered those features requisite for the present invention.

Claims

1. a kind of for one stretcher with the chain of chain span or the passive tensioner system of a belt of tensioning, should Stretcher includes：

One housing, this housing has a cylindrical hole；

One hollow piston, this hollow piston includes inside a body and a hollow, this body have an open end and One blind end, and there is inside this hollow an interior diameter；

One hollow displaceable sleeve, this hollow displaceable sleeve includes a hollow body, and this hollow body has a band Have interior diameter inside, have the Part I being received by the cylindrical hole of this housing and a Part II and In an inward flange of the end of this Part II, this inward flange has a top surface and a basal surface；

This hollow piston and this hollow displaceable sleeve are coaxially arranged in relation to each other in the cylindrical hole of this housing so that in this One of empty piston or this hollow displaceable sleeve are received in another in this hollow piston or this hollow displaceable sleeve The in the hole of person；

One piston spring, this piston spring is received within the hollow inside of this hollow piston for by this hollow piston Outwardly biased from this hollow displaceable sleeve, be there is being contacted with an inner surface of the blind end of this hollow piston Second end that first end and the top surface with the inward flange of this hollow displaceable sleeve contact；

One bias spring, this bias spring is received in the cylindrical hole of this housing and the hollow of this hollow displaceable sleeve Within portion for by this hollow displaceable sleeve from this housing outwardly biased, have one with this hollow displaceable sleeve in First end and second end that the basal surface of flange contacts；

One the first hydraulic chamber, this first hydraulic chamber is inside hollow by the body of this hollow displaceable sleeve, in this Inside the hollow of empty piston and this housing cylindrical hole formed and there is a first fluid input；

One the second hydraulic chamber, this second hydraulic chamber is to be formed by the cylindrical hole of this housing and this hollow displaceable sleeve So that acting as this hollow piston being pushed an inward force in a housing in this second hydraulic chamber Create a Fluid pressure so that this hollow displaceable sleeve pass through this piston spring to this hollow piston apply one with The contrary outside power of this inward force.

2. stretcher as claimed in claim 1, further includes by this cylindrical hole and this hollow displaceable sleeve The fixes sleeve of the hollow that diameter is received.

3. stretcher as claimed in claim 1, wherein, this cylindrical hole includes a Part I and a Part II, The diameter that this Part I of this cylindrical hole has is less than the diameter of this Part II of this cylindrical hole.

4. stretcher as claimed in claim 1, wherein, this hollow piston have received second of this hollow displaceable sleeve Point.

5. stretcher as claimed in claim 1, wherein, the Part II of this hollow displaceable sleeve have received this hollow and lives Plug.

6. stretcher as claimed in claim 1, wherein, this second hydraulic chamber is outer by one of this hollow displaceable sleeve The cylindrical hole of circumferential flange and this housing is formed.

7. stretcher as claimed in claim 6, wherein, this second hydraulic chamber is to pass through a check-valves with a source of supply It is in fluid communication.

8. stretcher as claimed in claim 6, wherein, this second hydraulic chamber is to pass through a control valve with a source of supply It is in fluid communication, this control valve includes guiding valve.

9. stretcher as claimed in claim 8, wherein, this source of supply is a holder, and this holder has one and is somebody's turn to do First hydraulic chamber is in the input of fluid communication by a check-valves.

10. stretcher as claimed in claim 6, wherein, this excircle flange is by first table with the first area Face and one have what the second surface of second area limited, and this first area is more than this second area.

11. stretchers as claimed in claim 1, wherein, this second hydraulic chamber is by a hole flange of this cylindrical hole With an otch formation of this hollow displaceable sleeve.

12. stretchers as claimed in claim 11, wherein, this second hydraulic chamber is to pass through a non-return with a source of supply Valve and be in fluid communication.

13. stretchers as claimed in claim 11, wherein, this hole flange be by a first surface with the first area and One second surface restriction with second area, this first area is more than this second area.

14. a kind of for one stretcher with the chain of chain span or the passive tensioner system of a belt of tensioning, This stretcher includes：

One housing, this housing has a cylindrical hole；

One piston, this piston includes a body；

This piston and this hollow displaceable sleeve are coaxially arranged in relation to each other in the cylindrical hole of this housing so that this piston quilt Receive the in the hole in this hollow displaceable sleeve；

One piston spring, this piston spring be used for by outwardly biased from this hollow displaceable sleeve for this piston, have with should A first end that one end of piston the contacts and top surface with the inward flange of this hollow displaceable sleeve contacts one Individual second end；

One the first hydraulic chamber, this first hydraulic chamber is inside hollow by the body of this hollow displaceable sleeve, this work Plug end and this housing cylindrical hole formed and there is a first fluid input；

One the second hydraulic chamber, this second hydraulic chamber is to be formed by the cylindrical hole of this housing and this hollow displaceable sleeve Produce in this second hydraulic chamber so that acting as this piston being pushed an inward force in a housing One Fluid pressure so that this hollow displaceable sleeve pass through this piston spring this piston is applied one inside with this The contrary outside power of power.

15. a kind of for one stretcher with the chain of chain span or the active tensioner system of a belt of tensioning, This stretcher includes：

One housing, this housing has a cylindrical hole, and this cylindrical hole has a Part I and a Part II, The diameter that this Part I has is less than the diameter of this Part II；

One hollow displaceable sleeve, this hollow displaceable sleeve includes a hollow body, and this hollow body has a band There is the inside of interior diameter；There is a Part I being received by the cylindrical hole of this housing and a Part II； In an inward flange of the end of this Part II, this inward flange has a top surface and a basal surface；And at this The excircle flange being received by the cylindrical hole of this housing between Part I and this Part II, this excircle flange There is a top surface and a basal surface；

One pressure chamber, this pressure chamber is to be formed simultaneously by internal and this housing the cylindrical hole of hollow of this hollow piston And there is a first fluid input；

One the first hydraulic chamber, this first hydraulic chamber is outer by the cylindrical hole of this housing and this hollow displaceable sleeve That the top surface of circumferential flange is formed, be to be in fluid communication with a source of supply；

One the second hydraulic chamber, this second hydraulic chamber is outer by the cylindrical hole of this housing and this hollow displaceable sleeve That the basal surface of circumferential flange is formed, be to be in fluid communication with this source of supply；

One control valve, this control valve has an output end being attached in this first and second hydraulic chamber and is attached to An input on this source of supply；

One actuator, the control that this actuator is fed back by a set point and hollow displaceable sleeve position and activate this Control valve；

Wherein this actuator this control valve mobile in case by fluid from this source of supply guide to this first hydraulic chamber or this second Hydraulic chamber, so that this hollow displaceable sleeve movement is applied on this hollow piston by this piston spring with changing One outside power.

16. stretchers as claimed in claim 15, wherein, this actuator is a linear actuators.

17. stretchers as claimed in claim 15, wherein, this actuator is a power actuator.

18. stretchers as claimed in claim 15, wherein, this set point is by multiple engine parameters and a set point Algorithm is determining.

19. stretchers as claimed in claim 15, wherein, this source of supply is a holder, and this holder has and this pressure Power chamber is in an input of fluid communication.

20. a kind of for one stretcher with the chain of chain span or the active tensioner system of a belt of tensioning, This stretcher includes：

One housing, this housing has a cylindrical hole, and this cylindrical hole has a Part I and a Part II, This Part I has a diameter of the diameter less than this Part II；

One piston, this piston includes a body；

One hollow displaceable sleeve, this hollow displaceable sleeve includes a hollow body, and this hollow body has a band There is the inside of interior diameter, there is a Part I being received by the cylindrical hole of this housing and a Part II； In an inward flange of the end of this Part II, this inward flange has a top surface and a basal surface；And at this The excircle flange being received by the cylindrical hole of this housing between Part I and this Part II, this excircle flange There is a top surface and a basal surface；

One piston spring, this piston spring be used for by outwardly biased from this hollow displaceable sleeve for this piston, have with should Contact one of one first end of the end thereof contacts of piston and the top surface with the inward flange of this hollow displaceable sleeve Two ends；

One bias spring, this bias spring is received in the cylindrical hole of this housing and the hollow of this hollow displaceable sleeve Within portion, for by this hollow displaceable sleeve from this housing outwardly biased, have one with this hollow displaceable sleeve in First end and second end that the basal surface of flange contacts；

One pressure chamber, this pressure chamber is formed by the cylindrical hole of this piston and this housing and has one first Fluid input；

One the second hydraulic chamber, this second hydraulic chamber is outer by the cylindrical hole of this housing and this hollow displaceable sleeve The basal surface of circumferential flange is formed and this source of supply is in fluid communication；

Wherein this actuator this control valve mobile in case by fluid from this source of supply guide to this first hydraulic chamber or this second Hydraulic chamber, so that this hollow displaceable sleeve movement is to change being applied on this piston by this piston spring Outside power.