CN102395818A

CN102395818A - Torque-sensing apparatus

Info

Publication number: CN102395818A
Application number: CN201080016676XA
Authority: CN
Inventors: R·施特尔
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2009-04-14
Filing date: 2010-03-18
Publication date: 2012-03-28
Anticipated expiration: 2030-03-18
Also published as: DE112010001625A5; CN102395818B; JP2012523534A; DE102010011822A1; WO2010118720A1

Abstract

The invention relates to a torque-sensing apparatus for a belt-driven conical pulley transmission, comprising a sensing piston (2; 32; 42; 52), which can be axially displaced relative to a shaft (4) that comprises at least one conducting opening (20), the effective conducting cross-section of which depends on the axial position of the sensing piston. The invention is characterized in that the sensing piston interacts with a seat valve device (38; 46; 60), which in a closed position closes the conducting opening without leakage.

Description

Torque sensing device

Technical field

The present invention relates to be used for the torque sensing device of awl dish-take-up strap speed changer; It has a sensingpiston; This sensingpiston can move relative to an axle, and this axle has at least one exhaust port, and the water cross section of this exhaust port is relevant with the axial position of sensingpiston.

Background technique

By the WO 2007/110026A1 of International Publication known a kind of torque sensing device that is used for awl dish-take-up strap speed changer of said type; Receive the restriction of structure must between axle and sensingpiston, reserve certain radial clearance, although be out of shape the soft motion that can guarantee sensingpiston and allow inevitable manufacturing tolerances on the other hand so that under working load, have on the one hand.This radial clearance between axle and sensingpiston will cause leaking, and its leakage rate depends on that viscosity increases when high temperature.

Summary of the invention

Task of the present invention is, on the torque sensing device according to the preamble of claim 1, reduces to leak, and can not make the gap amplitude limitation on the tolerance that can not realize.

This task has a sensingpiston at the torque sensing device that is used for awl dish-take-up strap speed changer-this torque sensing device; This sensingpiston can move relative to an axle in the axial direction; This axle has at least one exhaust port; The water cross section of this exhaust port is relevant with the axial position of sensingpiston-solves like this: and sensingpiston and a centre valve device cooperatively interact, and this centre valve device does not almost have the closed row outlet of the ground of leakage in a closed position.Wherein axial notion relates to the spin axis or the longitudinal axis of axle.Axially mean the direction of longitudinal axis or in parallel.On traditional torque sensing device, as known by the WO 2007/110026A1 of International Publication, sensingpiston and exhaust port show as a guiding valve that has leakage.Then can prevent in closed position, to derive leakage rate according to centre valve device of the present invention through exhaust port.Can reduce the leakage of torque sensing device thus significantly.

A preferred embodiment of this torque sensing device is characterised in that: the centre valve device comprises a closure body, and this closure body joins with the sensingpiston coupling in the axial direction.This coupling in the axial direction joins and will cause: closure body can be operated through sensingpiston.Join and to realize closure body taking in the axial direction through sensingpiston through this coupling.The coupling of closure body joins or for example takes and can or take projection and realize through the stage on the closure body.

Another preferred embodiment of this torque sensing device is characterised in that: closure body and sensingpiston coupling in this wise join, and promptly sensingpiston can irrespectively continue motion with closure body on the closing direction of closure body when closure body reaches its closed position.Can guarantee thus: when closure body reached its closed position, sensingpiston can be carried out its pumping function.This pumping function of sensingpiston especially allows pressure rising fast in the pressurized chamber of awl dish-take-up strap speed changer when the external dynamic torque peak occurring.Pumping function for sensingpiston is reserved best several millimeters pump stroke in an oblique mechanism of torque sensing device.

Another preferred embodiment of this torque sensing device is characterised in that: closure body is made to the closed loop with closure body sealing the margin or closure body sealing surface, and sealing edge or sealing surface form the sealing contact to corresponding sealing surface or corresponding sealing the margin in the closed position of closure body.The sealing surface of mutual formation contact and/or sealing the margin show as one and are sealed and matched, and in the closed position of closure body, can not have the ground of leakage closed row through it and export.Sealing surface preferably is made to taper.

Another preferred embodiment of this torque sensing device is characterised in that: closed loop has at least one and takes device, and this is taken device and can join with the sensingpiston coupling on axially at one.Take device and can be made to stage, projection or backstop on closed loop or the closure body.Taking device is preferably extended by closed loop or closure body radially outwardly.

Another preferred embodiment of this torque sensing device is characterised in that: corresponding sealing surface or corresponding sealing the margin are built on the axle.Corresponding sealing surface or corresponding sealing the margin preferably are built on the axle stage.Exhaust port preferably is set in the zone of a stage.

Another preferred embodiment of this torque sensing device is characterised in that: corresponding sealing surface or corresponding sealing the margin are built on the respective disc, and this respective disc is fixed on the axle.Respective disc preferably by another, especially wear-resisting than axle material constitutes.Respective disc preferably is made to annular respective disc, for example is fixed on the axle through press fit.

Another preferred embodiment of this torque sensing device is characterised in that: respective disc is made up of the material that is different from axle and/or is hardened.The material of respective disc is preferably selected in this wise, promptly can satisfy extra high requirement aspect the sealing function that is sealed and matched.

Another preferred embodiment of this torque sensing device is characterised in that: closure body is clamped in its closed position in advance.Can avoid hydraulic medium to pass through the undesirable discharge of exhaust port thus.

Another preferred embodiment of this torque sensing device is characterised in that: closure body is clamped in its closed position through a spring assembly in advance.This spring assembly for example can be made to helical compression spring or saucerspring.

Another preferred embodiment of this torque sensing device is characterised in that: closure body is clamped in its closed position through pressure in advance.Can clamp conversion ground to the spring of above-mentioned closure body in advance or the pressure-loaded of closure body additionally is set.

Another preferred embodiment of this torque sensing device is characterised in that: between closure body and sensingpiston, be provided with a Sealing.Sealing through jointing place between closure body and the sensingpiston can reduce to leak further.

Another preferred embodiment of this torque sensing device is characterised in that: between closure body and axle, be provided with a Sealing.Sealing through the jointing place between closure body and axle can reduce to leak further.

Another preferred embodiment of this torque sensing device is characterised in that: closure body has at least one control groove.Can make the closure at the place of being sealed and matched of embodying be designed to be softer thus by closure body.Can make characteristic according to centre valve of the present invention characteristic before reaching the closed position of closure body thus near a guiding valve.

Other advantage of the present invention, characteristic and details can be by below in conjunction with learning in the explanation of accompanying drawing to each embodiment's detailed description.

Description of drawings

Fig. 1: the longitudinal section of a section of a traditional torque sensing device with sensingpiston and an axle;

Fig. 2: according to the section of similar Fig. 1 of the first embodiment of the present invention;

Fig. 3: according to the section III among Fig. 2 of another embodiment's a amplification;

Fig. 4: according to the section of similar Fig. 1 of another embodiment;

Fig. 5: according to the section of similar Fig. 1 of another embodiment; And

Fig. 6: according to the section among Fig. 5 of another embodiment's a amplification.

Embodiment

Represent to have traditional torque sensing device 1 of a sensingpiston 2 and an axle 4 among Fig. 1 with the mode of longitudinal section and section.Axle 4 can be around a longitudinal axis or spin axis 5 rotations.Sensingpiston 2 comprises an axial section 8, and sensingpiston 2 can move by this axial section with on axle 4, axially being directed to.Extend a radial segment 9 radially outwardly by the axial section 8 of sensingpiston 2.By this radial segment 9 obliquely, relatively extend a piston body 10 outside the angle of longitudinal axis 5 with about 45 degree in other words.The axial section 8 of sensingpiston 2 integrally is connected with piston body 10 through radial segment 9.Represent through a double-head arrow 12: sensingpiston 2 at work can two axially on, be to reach to the right left among Fig. 1 to move.

Axle 4 comprises a vertical hole 14, and it is made to blind hole and is set out by a transverse holes 15.This outer shaft 4 comprises another vertical hole 17, and it also is made to blind hole and is set out by a transverse holes 18.The outlet of transverse holes 18 is called as exhaust port 20.The axial section 8 of sensingpiston 2 has been sealed exhaust port 20 in state shown in Figure 1.When sensingpiston 2 continue to move right, during like motion shown in by a dotted line, exhaust port 20 keeps shut.When sensingpiston 2 in Fig. 1 to left movement, promptly leave transverse holes 15 ground when motion, 20 of exhaust ports at first partly reach then and are fully discharged by the axial section 8 of sensingpiston 2.

Structure and function as shown in fig. 1 and above torque sensing device that describe, traditional are for example known by the WO 2007/110026A1 of International Publication, can be with reference to the document, in order to avoid repeat to this.The sensingpiston 2 that cooperatively interacts with exhaust port 20 shows as a guiding valve, still occurs leaking when exhaust port 20 is passed through exhaust port 20 by axial section 8 sealings of sensingpiston 2 even wherein depend on structure.Look form of implementation and fix on the leakage rate that occurs in the work can reach a pump quantity delivered percent 50, this pump is used as carries the operating fluid that is used to operate awl travelling expenses strip winding speed changer.

Expression each embodiment of the present invention wherein replaces known guiding valve through centre valve among Fig. 2 to 6, in case this centre valve cuts out, will not have leakage or does not almost have leakage.Because centre valve does not allow the stroke of continuation for the important at work pumping function of sensingpiston when reaching its closed position, another importance sensingpiston that divides according to the present invention and shut-off block couplet of decoupling is so that allow this pumping function.In the case according to torque sensing device of the present invention both can be made to two-stage, promptly have two pressure levels, also can be made to variable.The pressure side of sensingpiston is divided into two part faces in the form of implementation of two-stage.In variable torque sensing device winding band device, especially the impacting force of chain belt recently changes according to torque and/or speed change.

Identical part is provided with identical label in Fig. 1 to 6.Can be for fear of repetition with reference to above description to Fig. 1.Below the difference between each embodiment will be discussed mainly.

Axle 4 also comprises another transverse holes 28 except that transverse holes 18 in the embodiment shown in Figure 2, and this transverse holes is also set out by vertical hole 17.Sensingpiston 32 comprises a piston body 34, and axial section 35 of this piston body integrally connects.Radially inwardly bend a radial segment 36 by axial section 35.Piston body 34 outrigger shaft basically integrally is connected obliquely and with axial section 35 and radial segment 36.Sensingpiston 32 has a flange that extends radially inwardly 37 on the tie point between axial section 35 and the piston body 34.

Torque sensing device 1 shown in Fig. 2 comprises a centre valve device 38 with closure body 39, and this closure body is made to closed loop.Closure body 39 is clamped on the stage of axle 4 by a spring assembly 40 in advance, and this spring assembly is made to helical compression spring.Flange 37 comprises a circular groove, receives a Sealing 33 therein, and the sealing part for example is made to the jointing place between O RunddichtringO and sealing sensingpiston 32 and the closure body 39.This outward flange 37 in the axial direction, take device 41 and cooperatively interact with one left among Fig. 2 so that when the precompression of sensingpiston 32 closure body 39 antagonistic spring devices 40 during to left movement, when leaving the motion of transverse holes 15 ground with sensingpiston 32 to left movement.Spring assembly 40 is set in the spring housing 43, and spring housing 43 forms with vertical hole 17 through another transverse holes 28 and is connected.

Closure body 39 has a sealing the margin on it carries the end of spring assembly 40, the sealing edge contacts hermetically on the axle stage in the closed position shown in Fig. 2, in the zone of this stage, is provided with exhaust port 20.Shown in closed position in this exhaust port 20 do not have and be not closed body 39 closures with leaking.When closure body 39 by shown in its closed position, promptly leave transverse holes 15 ground when motion left, at first partly reach and fully discharge exhaust port 20 then.Closure body 39 both also was clamped in its closed position through the pressure in the spring housing 43 through the precompression of spring 40 in advance in the embodiment shown in Figure 2.Can see among this external Fig. 2: sensingpiston 32 irrespectively can be continued to the right by position shown in its Fig. 2, promptly move towards transverse holes 15 with closure body 39, and the stagnation pressure that causes in the time of making closure body 39 motions with simple methods through another transverse holes 28 reduces.

Amplify the ground expression among Fig. 3 according to the section III among Fig. 2 of another embodiment.In order to show sealing seat is provided with an annulus cast formula on the axle stage respective disc 30, this respective disc is made up of the material that is different from axle 4.Directly upwards be provided with a seal ring 31 in order to seal respective disc 30 and the jointing place of axle between 4 between the stage of axle 4 and the respective disc 30.Closure body 39 shown in closed position in contact hermetically on the sealing surface of respective disc 30 with its sealing the margin.Respective disc 30 is especially hardened in the zone of sealing surface.

Sensingpiston 42 comprises a piston body 44 in the embodiment shown in fig. 4, extends an axial section 45 by this piston body to inner radial.Axial section 45 is used to operate a centre valve device 46, and the latter comprises a closure body 47.Closure body 47 has a sealing the margin on an axial end portion, the sealing EDGE CONTACT is on a sealing surface, and the sealing face is arranged in the zone of exhaust port 20 on the stage.Closure body 47 is made to closes ring and being clamped in advance on the sealing surface of a stage through a spring assembly 48, and this spring assembly is made to helical spring.Spring assembly 48 is clamped between closure body 47 and the axial stop 49 in the axial direction.Axial stop can be made to the cyclization that is press-fitted with a rectangular cross section.

Closure body 47 has one at it on the end of spring assembly 48 and takes device 50, and it takes projection with one or a form of taking the rotating ring circle is extended radially outwardly.Taking device 50 through this will guarantee: when sensingpiston 42 depended on that this motion is carried out in its place of working, closure body 47, promptly left the motion of transverse holes 15 ground left with the precompression of antagonistic spring device 48 in Fig. 4.When sensingpiston 42 in the axial direction, promptly in Fig. 4 during to left movement, closure body 47 is also to left movement, so that 20 of exhaust ports at first partly reach then and fully are released.In addition sensingpiston 42 can with closure body 47 irrespectively to the right, promptly move towards transverse holes 15 ground.

Sensingpiston 52 comprises a piston body 54 in the embodiment shown in fig. 5, extends an axial section 55 by this piston body.Radially inwardly bend a radial segment 56 again by axial section 55.Extend an axial section 57 again by this radial segment 56, this axial section connect in the centre under the situation of a Sealing 58 can be on the excircle of axle 4 leading.

The axial section 55 of sensingpiston 52 and radial segment 56 define an annular receiving chamber that is used for centre valve device 60 with an axle stage 59, and this valve comprises a closure body 62.Closure body 62 has a sealing the margin at it on the axial end portion of transverse holes 15, the sealing edge abuts against on the sealing surface of a stage 59 in closed position shown in Figure 5.The radially outer of closure body 62 has at least one connecting passage 63, and this connecting passage makes first pressure chamber 64 be connected with second pressure chamber 65.Between closure body 62 and axle 4, be provided with a Sealing 66 in inner radial.

Sensingpiston 52 has a baffle ring 67 in order to operate closure body 62, and it for example is fastened on the sensingpiston 52 through press fit.Two

pressure chambers

64,65 are set at the annular receiving chamber that is used for centre valve device 60 in pairs.The spring assembly 68 of a helical compression spring form is clamped between the axial section 57 and closure body 62 of sensingpiston 52 in the axial direction in first pressure chamber 64.Second pressure chamber 65 is set at the radially outer of exhaust port 20, and second pressure chamber is connected with this exhaust port when closure body 62, promptly leaves the motion of transverse holes 15 ground left by the closed position shown in Fig. 5.

The opening of closure body 62 move through left motion of sensingpiston 52, promptly leave transverse holes 15 ground moves and causes.In case when baffle ring 67 was stopped in the zone of the connecting passage 63 on the closure body 62, the opening of sensingpiston 52 moved through baffle ring 67 and is delivered on the closure body 62.The closing motion of closure body 62 causes through the pressure difference between the return pressure in two

pressure chambers

64,65 and transverse holes 18 or the vertical hole 17.Spring assembly 68 selectively uses and assists and overcomes the frictional force that when closure body 62 is closed, is caused by seal ring 66 in the embodiment shown in fig. 5.

Amplify the section that has a stage 59 among ground expression Fig. 5 among Fig. 6 according to another embodiment.In order to embody on closure body 62 structure of being sealed and matched the sealing surface 71 of a taper is arranged in this embodiment, it abuts against on the sealing the margin 72 of a stage 59 hermetically.For the closing motion that makes closure body 62 designs softlyer in the zone that is sealed and matched; Closure body 62 is provided with the annular solid 74 of an additional band control groove 70, and it is indicated on Fig. 6 in the plan view of longitudinal section and this closure body 62 above figure of axle 4.Before reaching closed position, can realize the characteristic of a guiding valve through control groove 70.

Reference numerals list

Claims

1. be used for the torque sensing device of awl dish-take-up strap speed changer, have sensingpiston (2; 32; 42; 52), this sensingpiston can move relative to axle (4) in the axial direction, and this axle has at least one exhaust port (20), and the water cross section of this exhaust port is relevant with the axial position of sensingpiston, it is characterized in that: this sensingpiston (32; 42; 52) with centre valve device (38; 46; 60) cooperatively interact, this centre valve device does not have in closed position closes this exhaust port (20) with leaking.

2. according to the torque sensing device of claim 1, it is characterized in that: said centre valve device (38; 46; 60) comprise closure body (39; 47; 62), this closure body in the axial direction with said sensingpiston (2; 32; 42; 52) coupling joins.

3. according to the torque sensing device of claim 2, it is characterized in that: said closure body (39; 47; 62) with said sensingpiston (2; 32; 42; 52) coupling joins in this wise, makes when said closure body (39; 47; Said sensingpiston (2 when 62) reaching its closed position; 32; 42; 52) can with said closure body (39; 47; 62) continue motion irrespectively and on the closing direction of said closure body.

4. according to the torque sensing device of claim 2 or 3, it is characterized in that: said closure body (39; 47; 62) be made to the closed loop with closure body sealing the margin or closure body sealing surface, this closure body sealing the margin or closure body sealing surface recline with corresponding sealing surface or corresponding sealing the margin in the said closed position of said closure body hermetically.

5. according to the torque sensing device of claim 4, it is characterized in that: said closed loop has at least one and takes device (41; 50), this take device can said axially on said sensingpiston (42; 52) coupling joins.

6. according to the torque sensing device of claim 4 or 5, it is characterized in that: said corresponding sealing surface or corresponding sealing the margin are built on the said axle (4).

7. according to the torque sensing device of claim 4 or 5, it is characterized in that: said corresponding sealing surface or corresponding sealing the margin are built on the respective disc (30), and this respective disc is fixed on the said axle (4).

8. according to the torque sensing device of claim 7, it is characterized in that: said respective disc (30) is made up of the material that is different from said axle (4) and/or is hardened.

9. according to each torque sensing device in the claim 2 to 8, it is characterized in that: said closure body (39; 47; 62) be clamped in advance in its closed position.

10. according to the torque sensing device of claim 9, it is characterized in that: said closure body (39; 47; 62) through spring assembly (40; 48; 68) be clamped in advance in its closed position.

11. the torque sensing device according to claim 9 or 10 is characterized in that: said closure body (39; 62) be clamped in advance in its closed position through pressure.

12., it is characterized in that: between said closure body (39) and said sensingpiston (32), be provided with Sealing (33) according to each torque sensing device in the claim 2 to 11.

13., it is characterized in that: between said closure body (62) and said axle (4), be provided with Sealing (66) according to each torque sensing device in the claim 2 to 12.

14. according to each torque sensing device in the claim 2 to 13, it is characterized in that: closure body (62) has at least one control groove (70).