CN103765044A

CN103765044A - Chain drive tensioner spring force control mechanism

Info

Publication number: CN103765044A
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: 2014-04-30
Anticipated expiration: 2032-09-06
Also published as: JP6189846B2; RU2014113136A; CN103765044B; 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 stretcher spring force control mechanism

Background of invention

The explanation of correlation technique

In general, the timing chain driving at valve for internal-combustion engine, for thering is stretcher in the camshaft chain of camshaft-camshaft actuated and balace weight chain, these stretchers are used in the slack side of chain to tighten up the loose degree in this chain and this chain is applied to tension force.

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 increases due to chain span resonance, from the high capacity of chain, act on the piston of stretcher, thereby piston-retraction is entered in the housing of stretcher.

The spring force of chain drive stretcher is conventionally too high for most of operating conditionss, and this just makes this spring force be enough to deal with the operating conditions of the worst case of tensioner system.If stretcher spring force can consider the wearing and tearing that occur during service life of chain and stretching and along with operating conditions changes, the effect of stretcher and overall system characteristic and efficiency just can be improved.

Invention field

The invention belongs to the field of stretcher.More particularly, the invention belongs to chain drive stretcher spring force control mechanism.

Summary of the invention

A kind of stretcher is provided, one of them inside power works and a piston is pushed in a housing and produced a hydrodynamic pressure in the Yi Ge hydraulic chamber that cylindrical hole by this housing and displaceable sleeve form, thereby makes a displaceable sleeve to this piston, apply the outside power that the power inside with this is contrary by a piston spring.

Brief Description Of Drawings

Fig. 1 a shows the first embodiment's of a new chain of tensioning the schematic diagram of stretcher of passive tensioner system.Fig. 1 b shows the schematic diagram of the stretcher of a wearing and tearing chain of tensioning without high capacity in the situation that.Fig. 1 c shows the schematic diagram of the stretcher of a wearing and tearing chain of tensioning in the situation that having high capacity.

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

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

Fig. 4 shows the schematic diagram of stretcher of the 4th embodiment's passive tensioner system, with a plurality of chambers of forming between the excircle flange of a displaceable sleeve and the hole flange of this housing maintain this displaceable sleeve with respect to the position of this piston, with new chain of tensioning.

Fig. 5 shows the schematic diagram of stretcher of the 5th embodiment's passive tensioner system, with a plurality of chambers of forming between an otch on the excircle of the hole of this housing flange and this displaceable sleeve maintain this displaceable sleeve with respect to the position of this piston, with new chain of tensioning.

Fig. 6 shows the schematic diagram of stretcher of the 6th embodiment's passive tensioner system, with a plurality of chambers of forming between the excircle flange of a displaceable sleeve and the hole of this housing maintain this displaceable sleeve with respect to the position of this piston, with new chain of tensioning.

Fig. 7 shows the schematic diagram of stretcher of the 7th embodiment's passive tensioner system, with a plurality of chambers of forming between the excircle flange of a displaceable sleeve and the hole flange being provided by a guiding valve of this housing maintain this displaceable sleeve with respect to the position of this piston, with new chain of tensioning.

Fig. 8 shows the schematic diagram of stretcher of the 8th embodiment's passive tensioner system, with a plurality of chambers of forming between the excircle flange of a displaceable sleeve and the hole being provided by a guiding valve of this housing and a storage maintain this displaceable sleeve with respect to the position of this piston, with new chain of tensioning.

Fig. 9 shows the schematic diagram of stretcher of the 9th embodiment's active tensioner system, has used feedback control with respect to piston and mobile and maintain a displaceable sleeve with new chain of tensioning.

Figure 10 shows the schematic diagram of stretcher of the tenth embodiment's active tensioner system, used feedback control come with respect to piston and a mobile displaceable sleeve with new chain of tensioning.

Detailed description of the invention

Multiple tensioner system shown in Fig. 1 a to 8 maintains a displaceable sleeve with respect to the position of a piston by Passive Control.Passive Control is defined as following system: wherein by feedback, do not adjust a displaceable sleeve with respect to the position of a piston of this stretcher.By contrast, Fig. 9 and 10 is active control systems, is wherein with the Real-time Feedbacks a plurality of parts and/or this displaceable sleeve itself of motor, to adjust the position of this sleeve.

Tensioner system of the present invention comprises a stretcher (describing in more detail hereinafter), and this stretcher is for a closed loop chain drive system of using at explosive motor.It can be used in the closed loop power transmission system between transmission shaft and at least one bent axle or be used in transmission shaft and a trunnion shaft between balance shaft system on.This tensioner system can also comprise an oil pump and use together with a plurality of petrolift drivers.In addition, these tensioner systems of the present invention also can be used together with belt driver.

Fig. 1 a to 1c shows the stretcher that carries out the first embodiment of tensioning under different chain conditions; Fig. 1 a is at new chain of tensioning; Fig. 1 b is wearing and tearing chain of tensioning without high capacity in the situation that; Fig. 1 c has wearing and tearing chain of tensioning in the situation of high capacity.

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has one with the inside of the first diameter parts D1 and Second bobbin diameter part D2, and wherein Second bobbin diameter part D2 is greater than the first diameter parts D1.

A displaceable sleeve 18 is received in the hole 2a of housing 2.This displaceable sleeve 18 be hollow and with the hole 2a of housing 2, the inner diameter part 17 of hollow displaceable sleeve 18 or hollow inside 3a inner and piston 3 has formed a pressure chamber 16 with pressure P 1.

A sleeve spring 5 is present in the 2a of hole and is received in the inner diameter part 17 of displaceable sleeve 18, wherein a bottom surface 24 of the first end 5a of this sleeve spring 5 and the inward flange 22 of this displaceable sleeve 18 contacts, and the second end 5b of this sleeve spring 5 contacts with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce that this displaceable sleeve 18 is remained on to the needed control force in desirable position with respect to piston 3.

This displaceable sleeve 18 has an excircle flange 20, this excircle flange increases to the diameter of displaceable sleeve 18 to be substantially equal to Second bobbin diameter part D2, but allows flange 20 in the Second bobbin diameter part D2 of hole 2a, slide and form Yi Ge fluid chamber 14 between the bottom surface 27 of this excircle flange 20 and the Second bobbin diameter part D2 of hole 2a.This fluid chamber 14 is communicated with in fluid by a supply line that comprises safety check 10 12 with an oil pressure supply source 7.Any leakage that this supply source 7 may occur with compensation to fluid chamber's 14 accommodating fluids.This safety check 10 prevents that any fluid of this fluid chamber 14 from returning and enters in this supply source 7.It should be noted, not to the top surface 29 of this excircle flange 20 and the region accommodating fluid pressure between the 2a of hole.

Within at least a portion before the circumferential flange outside 20 of this displaceable sleeve 18 is received in hollow piston 3 slidably.In hollow piston 3, also there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the inside 3a of hollow piston 3 and contacts with the top surface 26 of the inward flange 22 of displaceable sleeve 18.Thereby through hole 25 is present in and allows fluid to flow into the inside 3a of pistons 3 and flow to the top surface 26 of the inward flange 22 of displaceable sleeve 18 from entrance supply line 6 in inward flange 22.

At the bottom place of hole 2a, can exist an inlet non-return valve (not shown) and one for the entrance supply line 6 of oil pressure is provided to pressure chamber 16.To fluid chamber 14 provide fluid supply source 7 can with to entrance supply line 6, provide the supply source of fluid identical.Alternatively, this supply source 7 that provides the supply source of fluid can Yu Tong fluid chamber 14 to be communicated with in fluid to entrance supply line 6 is not identical.In addition, in hollow piston 3, can there is a relief opening or pressure relief valve (not shown).

Referring to Fig. 1 a, when this stretcher is during at a new chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.

Referring to Fig. 1 b, when this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve (not shown), be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Because the more substantial fluid of needs increases spring force so that piston 3 is outwards setovered from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in fluid chamber 14 and displaceable sleeve 18 is outwards moved from housing 2.It should be noted, this displaceable sleeve 18 is mainly due to the oil from supply source 7 rather than from the oil of hydraulic chamber 16 and outwards mobile.

Referring to Fig. 1 c, in the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power inwardly promotes (with dotted line indicate) from the piston position shown in Fig. 1 b towards housing 2 by piston 3.Fluid in the inside force and motion Shi You fluid chamber 14 of piston 3 blocks, and this is to leave fluid chamber 14 because the safety check 10 in supply line 12 has hindered fluid, thereby substantially by fluid chamber's 14 superchargings.The supercharging of fluid chamber 14 causes the inward flange 22 of displaceable sleeve 18 to piston 3, to apply an outside power contrary with inside power by piston spring 4.Thereby once remove this high capacity substantially by chamber 14 decompression from piston 3, supply source 7 is just by safety check 10 accommodating fluids and supply fluid to this fluid chamber 14 to fill this fluid chamber 14 and sleeve 18 is compensated and maintain sleeve 18 with respect to the position of piston 3 with respect to the movement of piston 3.

Thereby the movement of displaceable sleeve 18 is moved the second end 4b of piston spring 4 outwards setovers piston 3 from housing 2, and therefore to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

A plurality of Sealing (not shown) may reside between excircle flange 20 and displaceable sleeve 18 and the first diameter D1 in the Second bobbin diameter part D2 of hole 2a and hole between or any other the necessary place in this stretcher.

The hydraulic pressure rigidity of this stretcher is that the 16He fluid chamber of pressure chamber 14 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 18 moving inward towards housing 2 when this chain span.

Fig. 2 shows the stretcher of passive tensioner system that moves the second embodiment of a displaceable sleeve being received by hollow piston 3 33 with supply pressure.

A hollow displaceable sleeve 33 is received in the hole 2a of housing 2.At the interior fixed muffle 30 that receives a hollow of hollow displaceable sleeve 33.In the fixed muffle 30 of this hollow, there is sleeve spring 5.The first end 5a of this sleeve spring 5 contacts with the bottom surface 36 of an inward flange 34 of displaceable sleeve 33, and the bottom (the if there is no words of flange 31) of the second end 5b of this sleeve spring 5 and bottom surface 32 or the hole 29a of an inward flange 31 of the fixed muffle 30 of hollow contacts.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 33 remain on the needed control force in desirable position with respect to piston 3.In the inner diameter part 38 of fixed muffle 30, the inner diameter part 17 of the hollow inside of this hollow displaceable sleeve 33, and the inside 3a of piston 3 between form Liao Yige pressure chamber 16.

The diameter that displaceable sleeve 33 has is substantially equal to the diameter of this Second bobbin diameter part D2 but still allows displaceable sleeve 33 to slide in the 2a of hole.Between a bottom end surface 39 of the bottom of hole 2a 2c, this fixed muffle 30 and displaceable sleeve 33, form Liao Yige fluid chamber 37.This fluid chamber 37 is communicated with in fluid by a supply line that comprises safety check 10 12 with an oil pressure supply 7.Any leakage that this supply source 7 may occur with compensation to fluid chamber's 37 accommodating fluids.This safety check 10 prevents that any fluid of this fluid chamber 37 from returning and enters in this supply source 7.It should be noted, not to the region accommodating fluid pressure between the Second bobbin diameter part D2 of piston 3, this displaceable sleeve 33 and hole 2a.

Within at least a portion of this displaceable sleeve 33 is received in hollow piston 3 slidably.In hollow piston 3, also there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and contacts with the top surface 35 of the inward flange 34 of displaceable sleeve 33.Thereby through hole 25 is present in and allows fluid to flow into the inside 3a of these pistons and flow to the top surface 35 of the inward flange 34 of displaceable sleeve 33 from entrance supply line 6 in inward flange 34.

At the bottom place of hole 2a, can exist an inlet non-return valve (not shown) and one for the entrance supply line 6 of oil pressure is provided to pressure chamber 16.To fluid chamber 37 provide fluid supply source 7 can with to entrance supply line 6, provide the supply source of fluid identical.Alternatively, this supply source 7 that provides the supply source of fluid can Yu Tong fluid chamber 37 to be communicated with in fluid to entrance supply line 6 is not identical.In addition, in hollow piston 3, can there is a relief opening or pressure relief valve (not shown).

Be similar to Fig. 1 a, when this stretcher is during at a new chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve (not shown), be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.

When this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Be similar to Fig. 1 b, because the more substantial fluid of needs increases spring force so that piston 3 outwards biasing from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in the fluid chamber 37 between the hole 2a of displaceable sleeve 33, fixed muffle 30 and housing and displaceable sleeve 33 is outwards moved from housing 2.It should be noted, this displaceable sleeve is mainly due to the oil from supply source 7 rather than from the oil of hydraulic chamber 16 and outwards mobile.

In the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power makes piston 3 towards housing 2, inwardly promote (with dotted line, indicating) from the piston position shown in Fig. 1 c.Fluid in the inside force and motion Shi You fluid chamber 37 of piston 2 blocks, and this is to leave fluid chamber 37 because the safety check 10 in supply line 12 has hindered fluid, thereby substantially by chamber 37 superchargings.The supercharging of fluid chamber 37 causes the inward flange 34 of displaceable sleeve 33 to piston 3, to apply an outside power contrary with inside power by this piston spring.Thereby once remove this high capacity substantially by chamber 37 decompression from piston 3, supply source 7 is just by safety check 10 accommodating fluids and supply fluid to this fluid chamber 37 to fill this fluid chamber 37 and sleeve 33 is compensated and maintain sleeve 33 with respect to the position of piston 3 with respect to the movement of piston 3.

Thereby the movement of displaceable sleeve 33 is moved the second end 4b of piston spring 4 outwards setovers piston 3 from housing 2, and therefore to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

A plurality of Sealing (not shown) may reside between the Second bobbin diameter part D2 of displaceable sleeve 33 and hole 2a and between the first diameter D1 in Second bobbin diameter part D2 and hole or any other necessary place in this stretcher.

The hydraulic pressure rigidity of this stretcher is that the 16He fluid chamber of pressure chamber 37 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 33 moving inward towards housing 2 when this chain span.

Fig. 3 shows the stretcher of passive tensioner system that moves the 3rd embodiment of a displaceable sleeve 40 with supply pressure, and this displaceable sleeve has received a hollow piston 3.

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.A displaceable sleeve 40 is received in the hole 2a of housing 2.This displaceable sleeve 40 has a first opening 46a and a second opening 45a, this first opening is that a top inside diameter part 46 and the top surface 43 by central inward flange 41 limits, and this second opening is that a bottom inner diameter part 45 and a bottom surface 42 by central inward flange 41 limits.A through hole 47 of central authorities' inward flange 41 is connected to the second opening 45a by the first opening 46a of displaceable sleeve 40.A top surface 48 of displaceable sleeve 40 is exposed under atmospheric pressure.

A hollow piston 3 is received in the first opening 46a of displaceable sleeve 40, and this first opening is to be limited by the top inside diameter part 46 of central inward flange 41 and top surface 43.In hollow piston 3, there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and contacts with the top surface 43 of the central inward flange 41 of displaceable sleeve 40.

The fixed muffle 30 of a hollow is received in the second opening 45a of displaceable sleeve 40, and this second opening is that bottom inner diameter part 45 and the bottom surface 42 by central inward flange 41 limits.In the fixed muffle 30 of this hollow, there is sleeve spring 5.The first end 5a of this sleeve spring 5 contacts with the bottom surface 42 of the central inward flange 41 of displaceable sleeve 40, and the second end 5b of this sleeve spring 5 contacts with the bottom surface 32 of an inward flange 31 of the fixed muffle 30 of hollow.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 40 remain on the needed control force in desirable position with respect to piston 3.Between the inner diameter part 17 of the second opening 45a of an interior section 38 of fixed muffle 30 or the bottom in this hole (the if there is no words of flange 31), this displaceable sleeve 40 and the inside 3a of piston 3, form Liao Yige pressure chamber 16.Through hole 47 is present in central inward flange 41 and allows fluid to flow into the inside 3a of these pistons and flow to the top surface 43 of the central inward flange 41 of displaceable sleeve 40 from entrance supply line 6.

Between a bottom end surface 39 of bottom, this fixed muffle 30 and the displaceable sleeve 40 of hole 2a, form Liao Yige fluid chamber 37.This fluid chamber 37 is communicated with in fluid by a supply line that comprises safety check 10 12 with an oil pressure supply 7.This safety check 10 prevents that any fluid of this fluid chamber 37 from returning and enters in this supply source 7.

Be similar to Fig. 1 a, when this stretcher is during at a new chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.

When this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Be similar to Fig. 1 b, because the more substantial fluid of needs increases spring force so that piston 3 is outwards setovered from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in the fluid chamber 37 between displaceable sleeve 33 and fixed muffle 30 and displaceable sleeve 40 is outwards moved from housing 2.It should be noted, this displaceable sleeve is mainly due to the oil from supply source 7 rather than from the oil of hydraulic chamber 16 and outwards mobile.

In the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power inwardly promotes (with dotted line indicate) from the piston position shown in Fig. 1 c towards this housing by piston 3.Fluid in the inside force and motion Shi You fluid chamber 37 of this piston blocks, and this is to leave fluid chamber 37 because the safety check 10 in supply line 12 has hindered fluid, thereby substantially by fluid chamber's 37 superchargings.The supercharging of fluid chamber 37 causes the central inward flange 41 of displaceable sleeve 40 to piston 3, to apply an outside power contrary with inside power by piston spring 4.

Thereby once remove this high capacity substantially by chamber 37 decompression from piston 3, supply source 7 is just by safety check 10 accommodating fluids and supply fluid to this fluid chamber 37 to fill this fluid chamber 37 and sleeve 40 is compensated and maintain sleeve 40 with respect to the position of piston 3 with respect to the movement of piston 3.

Thereby the movement of displaceable sleeve 40 is moved the second end 4b of piston spring 4 outwards setovers piston 3 from housing 2, and therefore to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

A plurality of Sealing (not shown) may reside in any other the necessary place between hole 2a and this displaceable sleeve 40 or in this stretcher.

The hydraulic pressure rigidity of this stretcher is that the 16He fluid chamber of pressure chamber 37 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 40 moving inward towards housing 2 when this chain span.

Fig. 4 shows the stretcher of passive tensioner system that moves the 4th embodiment of a displaceable sleeve being received by hollow piston 3 with supply pressure.

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has one with the inside of the first diameter parts D1 and Second bobbin diameter part D2, and wherein Second bobbin diameter part D2 is greater than the first diameter parts D1.A hole flange 150 separates Second bobbin diameter part D2 hole 2a, that received piston 3 with another Second bobbin diameter part D2 of excircle flange 141 this hole, that received displaceable sleeve 140.

A displaceable sleeve 140 is received in the hole 2a of housing 2.This displaceable sleeve 140 be hollow and form Liao Yige pressure chamber 16 with the inside 3a of the hole 2a of housing 2, the inner diameter part 17 of hollow displaceable sleeve 140 and piston 3.A sleeve spring 5 is present in the 2a of hole and is received in the inner diameter part 17 of displaceable sleeve 140, wherein a bottom surface 147 of the first end 5a of this spring 5 and the inward flange 145 of this displaceable sleeve 140 contacts, and the second end 5b of this spring 5 contacts with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 140 remain on the needed control force in desirable position with respect to piston 3.

Displaceable sleeve 140 has an excircle flange 141, and this excircle flange has top surface 142 and a bottom surface 143 with area A 1 with area A 2.The area A 2 of top surface 142 is less than the area A 1 of bottom surface 143.Between the top surface 142 of this excircle flange 141 and the bottom surface 152 of this hole flange 150, formed a first fluid chamber 58, and formed a second fluid chamber 57 between the bottom surface 143 of this excircle flange 141 and another wall 73 of this Second bobbin diameter part D2.

This first fluid chamber 58 is connected on a supply source 7 by pipeline 55, and this pipeline preferably has a safety check 53, and this second fluid chamber 57 is connected on a supply source 7 by pipeline 56, and this pipeline equally preferably has a safety check

54.Safety check

53,54 prevents that any fluid in

fluid chamber

58,57 from returning and enters in this supply source 7.Any leakage that this supply source 7 may occur with compensation to fluid chamber's 58,57 accommodating fluids.

Within at least a portion before the excircle flange 141 of this displaceable sleeve 140 is received in hollow piston 3 slidably.In hollow piston 3, also there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and contacts with the top surface 146 of the inward flange 145 of displaceable sleeve 140.Thereby through hole 144 is present in and allows fluid to flow into the inside 3a of these pistons and flow to the top surface 146 of the inward flange 145 of displaceable sleeve 140 from entrance supply line 6 in inward flange 145.

At the bottom place of hole 2a, can exist an inlet non-return valve (not shown) and one for the entrance supply line 6 of oil pressure is provided to pressure chamber

16.To fluid chamber

57,58 provide fluid supply source 7 can with to entrance supply line 6, provide the supply source of fluid identical.Alternatively, this supply source 7 that provides the supply source of fluid can Yu

Tong fluid chamber

57,58 to be communicated with in fluid to entrance supply line 6 is not identical.In addition, in hollow piston 3, can there is a relief opening or pressure relief valve (not shown).

When this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Because the more substantial fluid of needs increases spring force with by piston 3 outwards biasing from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in the fluid chamber 57,58 between the hole 2a of displaceable sleeve 140 and this housing.It should be noted, this displaceable sleeve 140 is mainly due to the oil from supply source 7 rather than from the oil of hydraulic chamber 16 and outwards mobile.The area A 1 having due to the bottom surface 143 of this excircle flange 141 is greater than the area A 2 of the top surface 142 of this excircle flange 141, be similar to Fig. 1 b, make displaceable sleeve 140 mobile comparing in the opposite direction with chamber 58, chamber 57 needs less hydrodynamic pressure that displaceable sleeve 140 is outwards moved from housing.

In the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power inwardly promotes (with dotted line indicate) from the piston position shown in Fig. 1 c towards housing 2 by piston 3.Fluid in the inside force and motion Shi You fluid chamber 57 of this piston 3 blocks, and this is to leave fluid chamber 57 because the safety check 54 in supply line 56 has hindered fluid, thereby substantially by fluid chamber's 57 superchargings.In addition, in the situation that the area A 1 of the bottom surface 143 of this excircle flange 141 is greater than the area A 2 of the top surface 142 of this excircle flange 141, the supercharging of fluid chamber 57 causes the inward flange 145 of displaceable sleeve 33 by " pump ", to be risen or make displaceable sleeve 140 outwards move and to piston 3, applied the outside power that the power inside with this is contrary by piston spring 4 from housing 2.Thereby once remove this high capacity substantially by fluid chamber 57 decompression from piston 3, supply source 7 is just by safety check 54 accommodating fluids and supply fluid to this fluid chamber 57 to fill this fluid chamber 57 and sleeve 140 is compensated and maintain sleeve 140 with respect to the position of piston 3 with respect to the movement of piston 3.

Thereby the movement of displaceable sleeve 140 is moved the second end 4b of piston spring 4 outwards setovers piston 3 from housing 2, and therefore to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

It should be noted, when fluid chamber 57 is when reducing pressure, fluid chamber 58 is in supercharging.Be used for coming fill fluid chamber 57 that this displaceable sleeve 140 is moved from the fluid of supply source 7.This displaceable sleeve 140 moves and to exceed or to be greater than that piston 3 blocks with respect to the fluid in the position necessary stroke Shi You fluid chamber 58 of chain in order maintaining, this is to leave fluid chamber 58 because the safety check 53 in supply line 55 has hindered fluid, thereby substantially by chamber 58 superchargings.Once remove this load from this sleeve, chamber 58 with regard to decompression and supply source 7 just by safety check 53 accommodating fluids and supply fluid to this fluid chamber 58 to fill this fluid chamber 58 and sleeve 140 is compensated and maintain sleeve 140 with respect to the position of piston 3 with respect to the movement of piston 3, and regardless of how acting on other power on sleeve.

A plurality of Sealing (not shown) may reside in any other the necessary place between hole 2a and this displaceable sleeve 140 or in this stretcher.

The hydraulic pressure rigidity of this stretcher is that the 16He fluid chamber of

pressure chamber

57,58 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 140 moving inward towards housing 2 when this chain span.

Fig. 5 shows with supply pressure and moves one by the stretcher of the 5th embodiment's of the displaceable sleeve that piston received passive tensioner system.

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.A displaceable sleeve 163 is received in the hole 2a of housing 2.This displaceable sleeve 163 be hollow and form Liao Yige pressure chamber 16 with the inside 3a of the hole 2a of housing 2, the inner diameter part 169 of hollow displaceable sleeve 163 and piston 3.

A sleeve spring 5 is present in the 2a of hole and is received in the inner diameter part 169 of displaceable sleeve 163, wherein a bottom surface 166 of the first end 5a of this spring 5 and the inward flange 164 of this displaceable sleeve 163 contacts, and the second end 5b of this spring 5 contacts with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 163 remain on the needed control force in desirable position with respect to piston 3.

An excircle along displaceable sleeve 163 partly has a circumferential notch 168.The otch 168 of displaceable sleeve 163 receives a hole flange 160 slidably.This hole flange 160 has top surface 161 and a bottom surface 162 with area A 2 with area A 1.The area A 1 of the top surface 161 of hole flange 160 is greater than the area A 2 of the bottom surface 162 of hole flange 160.

Between the top surface 161 of this hole flange 160 and otch 168 surfaces of this displaceable sleeve 163, formed a first fluid chamber 58, and formed a second fluid chamber 57 between the bottom surface 162 of this hole flange 160 and another surface of the otch 168 of this displaceable sleeve 163.This first fluid chamber 58 is connected on a supply source 7 by pipeline 55, and this pipeline preferably has a safety check 53, and this second fluid chamber 57 is connected on a supply source 7 by pipeline 56, and this pipeline equally preferably has a safety check

54.Safety check

53,54 prevents that any fluid in

fluid chamber

58,57 from returning and enters in this supply source 7.Any leakage that supply source 7 occurs with compensation to fluid chamber's 57,58 accommodating fluids.

Within at least a portion before otch 168 of this displaceable sleeve 163 is received in hollow piston 3 slidably.In hollow piston 3, also there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the inside 3a of hollow piston 3 and contacts with the top surface 165 of the inward flange 164 of displaceable sleeve 163.Thereby through hole 144 is present in and allows fluid to flow into the inside 3a of these pistons and flow to the top surface 165 of the inward flange 164 of displaceable sleeve 163 from entrance supply line 6 in inward flange 164.

16.To fluid chamber

Tong fluid chamber

When this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Because the more substantial fluid of needs increases spring force with by piston 3 outwards biasing from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in the

fluid chamber

57,58 between the hole 2a of displaceable sleeve 163 and this housing.The area A 1 having due to the top surface 161 of this hole flange 160 is greater than the area A 2 of the bottom surface 162 of this hole flange 160, is similar to Fig. 1 b, compares with chamber 57, and chamber 58 needs less hydrodynamic pressure that displaceable sleeve 163 is outwards moved from housing.It should be noted, this displaceable sleeve 163 is mainly due to the oil from supply source 7 rather than from the oil of hydraulic chamber 16 and outwards mobile.

In the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power makes piston 3 towards housing 2, inwardly promote (with dotted line, indicating) from the piston position shown in Fig. 1 c.Fluid in the inside force and motion Shi You fluid chamber 58 of piston 3 blocks, and this is to leave fluid chamber 58 because the safety check 53 in supply line 55 has hindered fluid, thereby substantially by chamber 58 superchargings.In addition, in the situation that the area A 1 of the top surface 161 of hole flange 160 is greater than the area A 2 of the bottom surface 162 of this hole flange 160, the supercharging of fluid chamber 58 causes the inward flange 164 of displaceable sleeve 163 by " pump ", risen or outwards move and to piston 3, applied the outside power that the power inside with this is contrary by piston spring 4 from housing 2.Thereby once remove this high capacity substantially by chamber 58 decompression from piston 3, supply source 7 is just by safety check 53 accommodating fluids and supply fluid to this fluid chamber 58 to fill this fluid chamber 58 and sleeve 163 is compensated and maintain sleeve 163 with respect to the position of piston 3 with respect to the movement of piston 3.

Thereby the movement of displaceable sleeve 163 is moved the second end 4b of piston spring 4 outwards setovers piston 3 from housing 2, and therefore to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

It should be noted, when fluid chamber 58 is when reducing pressure, fluid chamber 57 is in supercharging.Be used for coming fill fluid chamber 58 that this displaceable sleeve 163 is moved from the fluid of supply source 7.This displaceable sleeve 163 moves and to exceed or to be greater than that piston 3 blocks with respect to the fluid in the position necessary stroke Shi You fluid chamber 57 of chain in order maintaining, this is to leave fluid chamber 57 because the safety check 54 in supply line 56 has hindered fluid, thereby substantially by chamber 57 superchargings.Once remove this load from this sleeve, fluid chamber 57 with regard to decompression and supply source 7 just by safety check 54 accommodating fluids and supply fluid to this fluid chamber 57 to fill this chamber 57 and sleeve 163 is compensated and maintain sleeve 163 with respect to the position of this piston with respect to the movement of piston 3, and regardless of how acting on other power on sleeve.

A plurality of Sealing (not shown) may reside in any other the necessary place between hole 2a and this displaceable sleeve 163 or in this stretcher.

The hydraulic pressure rigidity of this stretcher is that the chamber

16He fluid chamber

57,58 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 163 moving inward towards housing 2 when this chain span.

Fig. 6 shows with internal pressure region and flange pressure and moves one by the 6th embodiment's of the displaceable sleeve that piston received passive tensioner system.

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.A displaceable sleeve 80 is received in the hole 2a of housing 2.This displaceable sleeve 80 has a first opening 89a and a second opening 96a, this first opening is that a top inside diameter part 89 and the top surface 81 by central flange 82 limits, and this second opening is that a bottom inner diameter part 96 and a bottom surface 83 by central inward flange 82 limits.A through hole 97 of central authorities' inward flange 82 is connected to the second opening 96a by the first opening 89a of displaceable sleeve 80.A top surface 98 of displaceable sleeve 80 is exposed under the atmospheric pressure of this motor.

A hollow piston 3 is received in the first opening 89a of displaceable sleeve 80, and this first opening is to be limited by the top inside diameter part 89 of central inward flange 82 and top surface 81.In hollow piston 3, there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and contacts with the top surface 81 of the central inward flange 82 of displaceable sleeve 80.

A sleeve spring 5 is received in the second opening 96a of displaceable sleeve 80, and this second opening is that bottom inner diameter part 96 and the bottom surface 83 by central inward flange 82 limits.The first end 5a of this sleeve spring 5 contacts with the bottom surface 83 of the central flange 82 of displaceable sleeve 80, and the second end 5b of this sleeve spring 5 contacts with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 80 remain on the needed control force in desirable position with respect to piston 3.In the top inside diameter part 89 of sleeve 80, form Liao Yige pressure chamber 16 between the bottom inner diameter part 96 of sleeve 80, the hole 2a of housing and the inside 3a of this piston.Through hole 97 is present in central inward flange 81 and allows fluid flow out and flow to the first opening 89a from the second opening 96a from entrance supply line 6.

16.To fluid chamber

94,95 provide fluid supply source 7 can with to entrance supply line 6, provide the supply source of fluid identical.Alternatively, this supply source 7 that provides the supply source of fluid can Yu

Tong fluid chamber

94,95 to be communicated with in fluid to entrance supply line 6 is not identical.In addition, in hollow piston 3, can there is a relief opening or pressure relief valve (not shown).

Displaceable sleeve 80 has an excircle flange 84, this excircle flange is substantially equal to the width of Second bobbin diameter part D2, but allows flange 84 in the Second bobbin diameter part D2 of hole 2a, slide and form a first fluid chamber 95 and a second fluid chamber 94.This first fluid chamber 95 is connected on a supply source 7 by pipeline 93, and this pipeline preferably has a safety check 92, and this second fluid chamber 94 is connected on a supply source 7 by pipeline 91, and this pipeline equally preferably has a safety check

90.Safety check

92,90 prevents that any fluid in

fluid chamber

95,94 from returning and enters in this supply source 7.Supply source 7 where necessary to fluid chamber's 94,95 accommodating fluids to compensate leaking.Outer diameter under the circumferential flange outside 84 of displaceable sleeve 80 is received by a first diameter parts D1 of hole 2a, and this Second bobbin diameter part D2 is greater than this first diameter parts D1.

When this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Be similar to Fig. 1 a, because the more substantial fluid of needs increases spring force so that piston 3 is outwards setovered from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in the

fluid chamber

94,95 between the hole 2a of displaceable sleeve 80 and housing, and the hydrodynamic pressure in the chamber 16 on the bottom surface 83 on a bottom surface 99 of sleeve 80 and at central inward flange 82 makes sleeve 80 outwards move from this housing.It should be noted, this displaceable sleeve is mainly due to the oil from supply source rather than from the oil of hydraulic chamber 16 and outwards mobile.

In the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power inwardly promotes (with dotted line indicate) from the piston position shown in Fig. 1 c towards housing 2 by piston 3.Fluid in the inside force and motion Shi You fluid chamber 94 of this piston blocks, and this is to leave fluid chamber 94 because the safety check 90 in supply line 91 has hindered fluid, thereby substantially by chamber 94 superchargings.Pressure on the bottom surface 99 of displaceable sleeve 80, the supercharging of fluid chamber 94 also causes the central inward flange 82 of displaceable sleeve 80 to piston 3, to apply the outside power that the power inside with this is contrary by piston spring 4.Thereby once remove this high capacity substantially by chamber 94 decompression from piston 3, supply source 7 is just by safety check 10 accommodating fluids and supply fluid to this fluid chamber 94 to fill this fluid chamber 94 and sleeve 80 is compensated and maintain sleeve 80 with respect to the position of piston 3 with respect to the movement of piston 3.

Thereby the movement of displaceable sleeve 80 is moved the second end 4b of piston spring 4 outwards setovers piston 3 from housing 2, and therefore to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

It should be noted, when fluid chamber 94 is when reducing pressure, fluid chamber 95 is in supercharging.Be used for coming fill fluid chamber 94 that this displaceable sleeve 80 is moved from the fluid of supply source 7.This displaceable sleeve moves and to exceed or to be greater than that piston 3 blocks with respect to the fluid in the position necessary stroke Shi You fluid chamber 95 of chain in order maintaining, this is to leave fluid chamber 95 because the safety check 92 in supply line 93 has hindered fluid, thereby substantially by chamber 95 superchargings.Once remove this load from this sleeve 80, chamber 95 with regard to decompression and supply source 7 just by safety check 92 accommodating fluids and supply fluid to this fluid chamber 95 to fill this fluid chamber 95 and sleeve 80 is compensated and maintain sleeve 80 with respect to the position of piston 3 with respect to the movement of piston 3, and regardless of how acting on other power on sleeve.

A plurality of Sealing (not shown) may reside in any other the necessary place between hole 2a and this displaceable sleeve 80 or in this stretcher.

pressure chamber

94,95 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 80 moving inward towards housing 2 when this chain span.

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

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has one with the inside of the first diameter parts D1 and Second bobbin diameter part D2, and wherein Second bobbin diameter part D2 is greater than the first diameter parts D1.A hole flange 52 separates Second bobbin diameter part D2 hole 2a, that received piston 3 with another Second bobbin diameter part D2 of excircle flange 20 this hole, that received displaceable sleeve 18.

A displaceable sleeve 18 is received in the hole 2a of housing.This displaceable sleeve 18 be hollow and form Liao Yige pressure chamber 16 with the inside of the hole 2a of housing 2, the inner diameter part 17 of hollow displaceable sleeve 18 and piston 3.A sleeve spring 5 is present in the 2a of hole and is received in the inner diameter part 17 of displaceable sleeve 18, wherein a bottom surface 24 of the first end 5a of this spring 5 and the inward flange 22 of this displaceable sleeve 18 contacts, and the second end 5b of this spring 5 contacts with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 18 remain on the needed control force in desirable position with respect to 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 has been divided into the first and second

fluid chamber

58,57 by a Second bobbin diameter part D2 of housing 2.Between the top surface 20 of this excircle flange 29 and the bottom surface 51 of this hole flange 52, formed a first fluid chamber 58, and formed a second fluid chamber 57 between the bottom surface 27 of this excircle flange 20 and another wall 73 of this Second bobbin diameter part D2.

This first fluid chamber 58 is connected on a supply source 7 by pipeline 101 and a control valve 108.This second fluid chamber 57 is connected on a supply source 7 by pipeline 100 and control valve 108.Supply source 7 is only for the leakage of

convection cell chamber

57,58 is supplemented to these chamber accommodating fluids.Control valve 108 is preferably guiding valve, comprises a spool 109, and this spool has at least two

cylindrical boss

109a, 109b that are received in slidably in a hole 106.Hole 106 can be arranged in stretcher housing 2 or be positioned in motor away from stretcher housing.One end of this spool contacts with one the spring 110 that this spool is setovered in a first direction.

Within at least a portion before the circumferential flange outside 20 of this displaceable sleeve 18 is received in hollow piston 3 slidably.In hollow piston 3, also there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and contacts with the top surface 26 of the inward flange 22 of displaceable sleeve 18.Thereby through hole 47 is present in and allows fluid to flow into the inside 3a of these pistons and flow to the top surface 26 of the inward flange 22 of displaceable sleeve 18 from entrance supply line 6 in inward flange 22.

16.To fluid chamber

Tong fluid chamber

When this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Be similar to Fig. 1 b, because the more substantial fluid of needs increases spring force so that piston 3 outwards biasing from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in the

fluid chamber

57,58 between the hole 2a of displaceable sleeve 18 and this housing and displaceable sleeve 18 is outwards moved from this housing.

In the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power makes piston 3 towards this housing, inwardly promote (with dotted line, indicating) from the piston position shown in Fig. 1 c.Fluid in the inside force and motion Shi You fluid chamber 57 of piston 3 blocks, this is because the spring force from spring 110 on guiding valve 108 is positioned at boss 109a to have hindered fluid in a position with respect to pipeline 100 and leave fluid chamber 57, thereby substantially by chamber 57 superchargings.The supercharging of fluid chamber 57 causes the central inward flange 22 of displaceable sleeve 40 to piston 3, to apply an outside power contrary with inside power by piston spring 4.Thereby once remove this high capacity substantially by chamber 57 decompression from piston 3, supply source 7 just compensates and maintains sleeve 40 with respect to the position of piston 3 by guiding valve 108 accommodating fluid Dao Gai fluid chamber 57 and to sleeve 40 with respect to the movement of piston 3.

It should be noted, when fluid chamber 57 is when reducing pressure, fluid chamber 58 is in supercharging.Be used for coming fill fluid chamber 57 that this displaceable sleeve 18 is moved from the fluid of supply source 7.This displaceable sleeve 18 moves and to exceed or to be greater than that piston 3 blocks with respect to the fluid in the position necessary stroke Shi You fluid chamber 58 of chain in order maintaining, this is because guiding valve 108 has hindered fluid and left fluid chamber 58, thereby substantially by chamber 58 superchargings.Once remove this load from this sleeve, chamber 58 with regard to decompression and supply source 7 just by guiding valve 108 accommodating fluids and supply fluid to this fluid chamber 58 to fill this fluid chamber 58 and sleeve 18 is compensated and maintain sleeve 18 with respect to the position of piston 3 with respect to the movement of piston 3, and regardless of how acting on other power on sleeve.

A plurality of Sealing (not shown) may reside in any other the necessary place between hole 2a and this displaceable sleeve 18 or in this stretcher.

The hydraulic pressure rigidity of this stretcher is that the chamber

16He pressure chamber

57,58 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 40 moving inward towards housing 2 when this chain span.

Fig. 8 is an alternate embodiment of Fig. 7, and wherein control valve 108 is communicated with in fluid with a storage 114.This storage 114 is also communicated with in fluid by a safety check 125 with hole 2a, the inner diameter part 17 of hollow displaceable sleeve 18 and the formed pressure chamber 16 of the inside 3a of piston 3 by housing 2.This storage 114 stores or accumulates from the fluid of this pressure chamber 16 and under leak case, is supplied to

fluid chamber

57,58.

A displaceable sleeve 18 is received in the hole 2a of housing.This displaceable sleeve 18 be hollow and form Liao Yige pressure chamber 16 with the inner diameter part 17 of the hole 2a of housing 2, the inside of piston 3 and hollow displaceable sleeve 18.A sleeve spring 5 is present in the 2a of hole and is received in the inner diameter part 17 of displaceable sleeve 18, wherein a bottom surface 24 of the first end 5a of this spring 5 and the inward flange 22 of this displaceable sleeve 18 contacts, and the second end 5b of this spring 5 contacts with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 18 remain on the needed control force in desirable position with respect to piston 3.

fluid chamber

This first fluid chamber 58 is connected on a storage 114 by pipeline 101, control valve 108 and pipeline 112.This second fluid chamber 57 is connected on storage 114 by pipeline 100, control valve 108 and pipeline 112.Storage 114 is only for to leaking in addition supplementary object to

chamber

57,58 accommodating fluids.Control valve 108 is preferably guiding valve, comprises a spool 109, and this spool has at least two

cylindrical boss

109a, 109b that are received in slidably in a hole 106.Hole 106 can be arranged in stretcher housing 2 or be positioned in motor away from stretcher housing.One end of this spool contacts with one the spring 110 that this guiding valve is setovered in a first direction.

At the bottom place of hole 2a, can exist an inlet non-return valve (not shown) and one for the entrance supply line 6 of oil pressure is provided to pressure chamber 16.In addition, in hollow piston 3, can there is a relief opening or pressure relief valve (not shown).

When this stretcher is without high capacity in the situation that during a wearing and tearing chain of tensioning, in operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 to carry out supercharging and except the spring force from piston spring 4 also by piston 3 from housing 2 outwards biasing, thereby this closed loop chain span is setovered.Due to this chain wear, piston 3 must outwards be setovered farther so that this chain of sufficiently tensioning from housing 2.Be similar to Fig. 1 b, because the more substantial fluid of needs increases spring force with by piston 3 outwards biasing from housing 2, a part that is provided to the fluid of hydraulic chamber 16 leaks in the

fluid chamber

In the process of this stretcher in high chain load, during a wearing and tearing chain of tensioning, in operating process, this high power makes piston 3 towards this housing, inwardly promote (with dotted line, indicating) from the piston position shown in Fig. 1 c.Fluid in the inside force and motion Shi You fluid chamber 57 of this piston blocks, this is because the spring force from spring 110 on guiding valve 108 is positioned at boss 109a to have hindered fluid in a position with respect to pipeline 100 and leave fluid chamber 57, thereby substantially by chamber 57 superchargings.The supercharging of fluid chamber 57 causes the central inward flange 22 of displaceable sleeve 40 to piston 3, to apply an outside power contrary with inside power by piston spring 4.Thereby once remove this high capacity substantially by chamber 57 decompression from piston 3, storage 114 just supplies fluid to fluid chamber 57 to fill this fluid chamber 57 and the movement with respect to piston 3 compensates to sleeve 40 by guiding valve 108.

It should be noted, when fluid chamber 57 is when reducing pressure, fluid chamber 58 is in supercharging.Be used for coming fill fluid chamber 57 that this displaceable sleeve 40 is moved from the fluid of supply source 7.This displaceable sleeve 40 moves and to exceed or to be greater than that piston 3 blocks with respect to the fluid in the position necessary stroke Shi You fluid chamber 58 of chain in order maintaining, this is because guiding valve 108 has hindered fluid and left fluid chamber 58, thereby substantially by chamber 57 superchargings.Once remove this load from piston 3, just decompression and 57 superchargings of fluid chamber of fluid chamber 58.

The hydraulic pressure rigidity of this stretcher is that the chamber

16He pressure chamber

Fig. 9 shows the 9th embodiment's active stretcher control system.

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.This piston hole 2a has one with the inside of the first diameter parts D1 and Second bobbin diameter part D2, and wherein Second bobbin diameter part D2 is greater than the first diameter parts D1.A hole flange 52 separates with another Second bobbin diameter part D2 of excircle flange 20 this hole, that received displaceable sleeve 18 Second bobbin diameter part D2 hole 2a, that received piston 3 by a safety check 125.

A displaceable sleeve 18 is received in the hole 2a of housing 2.This displaceable sleeve 18 be hollow and form Liao Yige pressure chamber 16 with the inner diameter part 17 of the hole 2a of housing 2, the inside 3a of piston 3 and hollow displaceable sleeve 18.A sleeve spring 5 is present in the 2a of hole and is received in the inner diameter part 17 of displaceable sleeve 18, wherein a bottom surface 24 of the first end 5a of this spring 5 and the inward flange 22 of this displaceable sleeve 18 contacts, and the second end 5b of this spring 5 contacts with the bottom 2c of hole 2a.This sleeve spring 5 provides a bias force to reduce that this displaceable sleeve 18 is remained on to the needed control force in desirable position with respect to piston 3.

fluid chamber

58,57 by a Second bobbin diameter part D2 of housing 2.Between the top surface 20 of this excircle flange 29 and the bottom surface 51 of this hole flange 50, formed a first fluid chamber 58, and formed a second fluid chamber 57 between the bottom surface 27 of this excircle flange 20 and another wall 73 of this Second bobbin diameter part D2.

This first fluid chamber 58 is communicated with in fluid with a storage 114 by pipeline 101, control valve 108 and pipeline 112.This second fluid chamber 57 is communicated with in fluid with storage 114 by pipeline 100, control valve 108 and pipeline 112.This storage 114 is also preferably communicated with in fluid with hole 2a by housing 2 and the formed pressure chamber 16 of inner diameter part 17 of hollow displaceable sleeve 18.

Control valve 108 is preferably guiding valve, comprises a spool 109, and this spool has at least two

cylindrical boss

109a, 109b that are received in slidably in a hole 106, and these boss can hinder or allow flowing from storage 114Dao fluid chamber 57,58.Hole 106 can be arranged in stretcher housing 2 or be positioned in motor away from stretcher housing.One end of control valve 108 contacts with an actuator 116.In this embodiment, actuator 116 is a set positions actuator or linear actuators, and wherein this actuator is set a special position of this control valve 108.In an alternate embodiment, actuator 116 can be also a power actuator, wherein in a side of this control valve, exists strong.It should be noted, if actuator 116 is power actuators, will on the opposition side that affected by this actuator 116 of control valve, have a spring.

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

Within at least a portion before the circumferential flange outside 20 of this displaceable sleeve 18 is received in hollow piston 3 slidably.In hollow piston 3, also there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and contacts with the top surface 26 of the inward flange 22 of displaceable sleeve 18.Thereby a through hole 47 is present in permission fluid in inward flange 22 and from entrance supply line 6, flows to the interior section 3a of piston 3.

In operating process, fluid from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so as Dui Gai hydraulic chamber 16 and the chamber 9 that forms among the interior section 3a of piston to carry out supercharging and by the spring force from piston spring 4 by the outwards biasing from housing 2 of this piston, thereby this closed loop chain span is setovered.

A sensor (not shown) provides the position feedback 120 of displaceable sleeve 18 to this controller 118.This controller 118 compares the position feedback of this displaceable sleeve and the set point 122 from this set point algorithm or mapping collection of illustrative plates 124 based on different engine parameters 126.

If the position of this displaceable sleeve 18 equates with set point 122, control valve 108 is not moved or activates and these

boss

109a, 109b hinder fluid and flow to

fluid chamber

57,58 from storage 114.In addition,, owing to not having

convection cell chamber

57,58 to add or removing fluids, therefore maintained the position of displaceable sleeve 18 with respect to the hole 2a of piston 3 and housing.

If the position of this displaceable sleeve 18 and set point 122 are unequal, control valve 108 is actuated into a following position by actuator 116, thereby fluid flow to

fluid chamber

57,58 from storage 114 displaceable sleeve 18 is moved with respect to the hole 2a of piston 3 and housing in this position.The second end 4b that the movement of displaceable sleeve 18 contacts top surface 26 piston spring 4 and inward flange 22 displaceable sleeve 18 is moved, thereby piston 3 is outwards setovered from housing 2 and contact with a span of chain or belt (not shown).By piston 3 from housing 2 outwards the second end 4b of the piston spring 4 of biasing be movably in situation, to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

The hydraulic pressure rigidity of stretcher is that the chamber

16He fluid chamber

57,58 by this stretcher produces and in load lower time, has substantially prevented piston 3 and displaceable sleeve 18 moving inward towards housing 2 when this chain span.

Figure 10 shows the tenth embodiment's ACTIVE CONTROL tensioner system.

This stretcher comprises a housing 2, and this housing has an axially extended piston hole 2a.A displaceable sleeve 80 is received in the hole 2a of housing 2.This displaceable sleeve 80 has a first opening 89a and a second opening 96a, this first opening is that a top inside diameter part 89 and the top surface 82 by central inward flange 81 limits, and this second opening is that a bottom inner diameter part 96 and a bottom surface 83 by central inward flange 81 limits.A through hole 97 of central authorities' inward flange 81 is connected to the second opening 96a by the first opening 89a of displaceable sleeve 80.Displaceable sleeve 80 also has a top surface 98.

A hollow piston 3 is received in the first opening 89a of displaceable sleeve 80, and this first opening is to be limited by the top inside diameter part 89 of central inward flange 81 and top surface 82.In hollow piston 3, there is a piston spring 4 that piston 3 is outwards setovered from housing 2.The second end 4b that this piston spring 4 has first end 4a contacting with the interior section 3a of hollow piston 3 and contacts with the top surface 82 of the central inward flange 81 of displaceable sleeve 80.

A sleeve spring 5 is received in the second opening of displaceable sleeve 80, and this second opening is to be limited by the bottom interior surface 96 of central inward flange 81 and bottom surface 83.The first end 5a of this sleeve spring 5 contacts with the bottom surface 83 of the central inward flange 81 of displaceable sleeve 80, and the second end 5b of this sleeve spring 5 and the bottom connection of hole 2a touch.This sleeve spring 5 provides a bias force to reduce making this displaceable sleeve 80 remain on the needed control force in desirable position with respect to piston 3.Between the first and

second openings

89,96, hole 2a and the inside 3a of piston 3 of displaceable sleeve 80, form Liao Yige pressure chamber 16.Through hole 97 is present in central inward flange 81 and allows fluid to flow into the inside 3a of these pistons and flow to the top surface 82 of the central inward flange 81 of displaceable sleeve 80 from entrance supply line 6.

At 2c place, the bottom of hole 2a, can exist an inlet non-return valve (not shown) and one for the entrance supply line 6 of oil pressure is provided to pressure chamber 16.In addition, in hollow piston 3, can there is a relief opening or pressure relief valve (not shown).

Displaceable sleeve 80 has an excircle flange 84, this excircle flange is substantially equal to the width of Second bobbin diameter part D2, but allows flange 84 in the Second bobbin diameter part D2 of hole 2a, slide and form a first fluid chamber 95 and a second fluid chamber 94.This first fluid chamber 95 is connected on a storage 114 by pipeline 101, control valve 108 and pipeline 112.This second fluid chamber 94 is connected on storage 114 by pipeline 100, control valve 108 and pipeline 112.This storage 114 is also preferably communicated with in fluid by a safety check 125 with the formed pressure chamber 16 of bottom interior surface 96a of the second opening 96 of hole 2a by housing 2 and displaceable sleeve 80.

cylindrical boss

109a, 109b that are received in slidably in a hole 106, and these boss can hinder or allow flowing from storage 114Dao fluid chamber 94,95.Hole 106 can be arranged in stretcher housing 2 or be positioned in motor away from stretcher housing.One end of control valve 108 contacts with an actuator 116.In this embodiment, actuator 116 is a set positions actuator or linear actuators, and wherein this actuator is set a special position of this control valve.In an alternate embodiment, actuator 116 can be also a power actuator, wherein in a side of this control valve, exists strong.It should be noted, if actuator 116 is power actuators, will on the opposition side that affected by this actuator 116 of control valve, have a spring.

This actuator position is controlled by a controller 118, and this controller receives a set point input 122 from a set point logic OR mapping collection of illustrative plates 124.This controller 118 also receives the position feedback 120 of the displaceable sleeve 80 of this stretcher via a sensor (not shown).This set point logic OR mapping collection of illustrative plates 124 receives input from different engine parameter 126, and this parameter is such as but not limited to cam timing, engine speed, closure, temperature, working time and tensioner position.

In operating process, fluid is from entrance supply line 6 and optionally by an inlet non-return valve, be provided to this hydraulic chamber 16 so that Dui Gai hydraulic chamber 16 carries out supercharging and by the spring force from piston spring 4, this piston outwards setovered from housing 2, thereby this closed loop chain span is setovered.

A sensor (not shown) provides the position feedback 120 of displaceable sleeve 80 to this controller 118.This controller 118 compares the position feedback of this displaceable sleeve and the set point 122 from this set point algorithm or mapping collection of illustrative plates 124 based on different engine parameters 126.

If the position of this displaceable sleeve 80 equates with set point 122, control valve 108 is not moved or activates and these

boss

109a, 109b hinder fluid and flow to

fluid chamber

94,95 from storage 114.In addition,, owing to not having

convection cell chamber

94,95 to add or removing fluids, therefore maintained the position of displaceable sleeve 80 with respect to the hole 2a of piston 3 and housing.

If the position of this displaceable sleeve 80 and set point 122 are unequal, control valve 108 is actuated into a following position by actuator, thereby fluid flow to

fluid chamber

94,95 from storage 114 displaceable sleeve 80 is moved with respect to the hole 2a of piston 3 and housing in this position.The second end 4b that the movement of displaceable sleeve 80 contacts top surface 81 piston spring 4 and central inward flange 81 displaceable sleeve 80 is moved, thereby piston 3 is outwards setovered from housing 2 and contact with a span of chain or belt (not shown).By piston 3 from housing 2 outwards the second end 4b of the piston spring 4 of biasing be movably in situation, to act on spring force on piston 3 be variable and piston 3 constantly by this chain tension, even be also like this when this chain becomes wearing and tearing and elongation.

The hydraulic pressure rigidity of stretcher is that the chamber

16He fluid chamber

Therefore, be to be understood that these embodiments of the present invention described herein are only the explanations to the application of the principles of the present invention.Illustrated embodiment's details is not intended to limit the scope of claim referred in this, and these claims itself have been quoted from and have been considered to requisite those features for the present invention.

Claims

1. for one of tensioning, have a stretcher for the chain of chain span or the passive tensioner system of a belt, this stretcher comprises:

A housing, this housing has a cylindrical hole;

A hollow piston, this hollow piston comprises a body and a hollow inside, this body has an open end and a closed end, and this hollow inside has an inner diameter; < 0}

A hollow displaceable sleeve, this sleeve comprises a hollow body, this hollow body has the inside with inner diameter, have by the Yi Ge first portion that cylindrical hole received of this housing and second portion and at an inward flange of the tail end of this second portion, and this inward flange has a top surface and a bottom surface;

This hollow piston and this hollow displaceable sleeve are arranged in the cylindrical hole of this housing coaxially, make like this one in this hollow piston or this hollow displaceable sleeve be received in the hole of the another one in this hollow piston or this hollow displaceable sleeve;

A piston spring, second end that this piston spring is received within the hollow inside of this piston first end contacting with an internal surface of the closed end of this piston for this piston outwards being setovered from this sleeve, having and contacts with the top surface of a flange of this displaceable sleeve;

A bias spring, this bias spring is received within the hole of this housing and the hollow inside of this displaceable sleeve for a first end contacting with the bottom surface of the inward flange of this sleeve and second end are outwards setovered, had to this sleeve from this housing;

First hydraulic chamber, this first hydraulic chamber is that hollow inner by the hollow of the body of this displaceable sleeve, this piston hole inner and this housing forms and has a first fluid input end;

Second hydraulic chamber, this second hydraulic chamber is formed by the cylindrical hole of this housing and this displaceable sleeve, the inside power that individual piston is pushed in a housing that makes like this to work has produced a hydrodynamic pressure in this second hydraulic chamber, thereby makes this displaceable sleeve to this piston, apply the outside power that the power inside with this is contrary by this piston spring.

2. stretcher as claimed in claim 1, further comprises the fixed muffle of the hollow that the inner diameter by this hole and this displaceable sleeve receives.

3. stretcher as claimed in claim 1, wherein, this cylindrical hole comprises Yi Ge first portion and a second portion, the diameter that this first portion has is less than the diameter of this second portion.

4. stretcher as claimed in claim 1, wherein, this piston has received the first portion of this hollow sleeve.

5. stretcher as claimed in claim 1, wherein, the first portion of this hollow sleeve has received this piston.

6. stretcher as claimed in claim 1, wherein, this second hydraulic chamber is formed by an excircle flange of this displaceable sleeve and the cylindrical hole of this housing.

7. stretcher as claimed in claim 6, wherein, this second hydraulic chamber is communicated with in fluid by a safety check with a supply source.

8. stretcher as claimed in claim 6, wherein, this second hydraulic chamber is communicated with in fluid by a control valve with a supply source, and this control valve comprises guiding valve.

9. stretcher as claimed in claim 8, wherein, this supply source is a storage, this storage has an input end being communicated with in fluid by a safety check with this first hydraulic chamber.

10. stretcher as claimed in claim 6, wherein, this excircle flange is to be limited by first surface and a second surface with second area with the first area, this first area is greater than this second area.

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

12. stretchers as claimed in claim 11, wherein, this second hydraulic chamber is communicated with in fluid by a safety check with a supply source.

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

14. 1 kinds of stretchers for one of tensioning with the chain of chain span or the passive tensioner system of a belt, this stretcher comprises:

A housing, this housing has a cylindrical hole;

A piston, this piston comprises a body;

This piston and this hollow displaceable sleeve are arranged in the cylindrical hole of this housing coaxially, make like this this piston be received in the hole of this hollow displaceable sleeve;

A piston spring, second end of this piston spring for this piston is outwards setovered, had first end contacting with one end of this piston and contact with the top surface of a flange of this displaceable sleeve from this sleeve;

First hydraulic chamber, this first hydraulic chamber is that, this end of this piston inner by the hollow of the body of this displaceable sleeve and the hole of this housing form and has a first fluid input end;

15. 1 kinds of stretchers for one of tensioning with the chain of chain span or the active tensioner system of a belt, this stretcher comprises:

A housing, this housing has a cylindrical hole, and this cylindrical hole has Yi Ge first portion and a second portion, and the diameter that this first portion has is less than the diameter of this second portion;

A hollow piston, this hollow piston comprises a body and a hollow inside, this body has an open end and a closed end, and this hollow inside has an inner diameter;

A hollow displaceable sleeve, this hollow displaceable sleeve comprises a hollow body, this hollow body has one with the inside of inner diameter; There is one by the Yi Ge first portion that cylindrical hole received of this housing and a second portion; At a flange of the tail end of this second portion, this flange has a top surface and a bottom surface; And between Gai first portion and this second portion by the excircle flange that cylindrical hole received of this housing, this excircle flange has a top surface and a bottom surface;

A piston spring, second end that this piston spring is received within the hollow inside of this piston first end contacting with an internal surface of the closed end of this piston for this piston outwards being setovered from this sleeve, having and contacts with the top surface of the flange of this displaceable sleeve;

Yi Ge pressure chamber, this pressure chamber is that the hole of and this housing inner by the hollow of this piston forms and has a first fluid input end;

First hydraulic chamber, this first hydraulic chamber be that the top surface by the cylindrical hole of this housing and the excircle flange of this displaceable sleeve forms, be communicated with in fluid with a supply source;

Second hydraulic chamber, this second hydraulic chamber be that the bottom surface by the cylindrical hole of this housing and the excircle flange of this displaceable sleeve forms, be communicated with in fluid with a supply source;

A control valve, this control valve has the output terminal being attached in this first and second hydraulic chamber and is attached to an input end on this supply source;

An actuator, this actuator is subject to the control of a set point and a displaceable sleeve position feedback and activates this control valve;

Wherein this actuator moves this control valve to fluid is guided to this first hydraulic chamber or this second hydraulic chamber from supply source, thereby make this displaceable sleeve move to change by this piston spring, is applied to an outside power on this piston.

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 determined by a plurality of engine parameters and a set point algorithm.

19. stretchers as claimed in claim 15, wherein, this supply source is a storage, this storage has the input end being communicated with in fluid with this first hydraulic chamber.

20. 1 kinds of stretchers for one of tensioning with the chain of chain span or the active tensioner system of a belt, this stretcher comprises:

A housing, this housing has a cylindrical hole, and this cylindrical hole has Yi Ge first portion and a second portion, and this first portion has a diameter of the diameter that is less than this second portion;

A piston, this piston comprises a body;

A hollow displaceable sleeve, this hollow displaceable sleeve comprises a hollow body, this hollow body has the inside with inner diameter, has one by the Yi Ge first portion that cylindrical hole received of this housing and a second portion; At a flange of the tail end of this second portion, this flange has a top surface and a bottom surface; And between Gai first portion and this second portion by the excircle flange that cylindrical hole received of this housing, this excircle flange has a top surface and a bottom surface;

A piston spring, this piston spring is for outwards setovering this piston, have and first end of an end in contact of this piston and second end contacting with the top surface of the flange of this displaceable sleeve from this sleeve;

A bias spring, within this bias spring is received in the hole of this housing and the hollow inside of this displaceable sleeve, for a first end contacting with the bottom surface of the inward flange of this sleeve and second end are outwards setovered, had to this sleeve from this housing;

Yi Ge pressure chamber, this pressure chamber is that the hole by this piston and this housing forms and has a first fluid input end;