CN105370932A - A hydraulic tensioning device - Google Patents
A hydraulic tensioning device Download PDFInfo
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- CN105370932A CN105370932A CN201410319206.0A CN201410319206A CN105370932A CN 105370932 A CN105370932 A CN 105370932A CN 201410319206 A CN201410319206 A CN 201410319206A CN 105370932 A CN105370932 A CN 105370932A
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- spool
- way valve
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Abstract
The invention provides a hydraulic tensioning device comprising an outer shell, a hollow piston and a one-way valve. The outer shell comprises an accommodating cavity and a hydraulic oil channel close to the bottom of the accommodating cavity; the hollow piston can be movably accommodated in the accommodating cavity; the outer shell and the piston form a hydraulic cavity; the one-way valve located at the bottom of the accommodating cavity is used for making hydraulic oil flow to the hydraulic cavity from the hydraulic oil channel uni-directionally. The one-way valve comprises a valve element and a valve seat; the valve element can move relative to the valve seat in the direction of the central axis thereof to control the opening and closing of the one-way valve; the valve element comprises a sealing surface; when the sealing surface comes into contact with the valve seat, the one-way valve is closed; when the sealing surface is separated from the valve seat, the one-way valve is opened; the valve element also comprises a rotation drive part located on the sealing surface. When the one-way valve is opened, the hydraulic oil flowing to the hydraulic cavity from the hydraulic oil channel applies working force on the rotation drive part to drive the valve element to rotate around the central axis thereof. The problem that the sealing performance of a one-way valve of a conventional hydraulic tensioning device is not good after long-time work is solved.
Description
Technical field
The present invention relates to a kind of Hydranlic tensioner, for the tension force of the Chain conveyer or belt drive system that keep internal-combustion engine.
Background technique
Hydranlic tensioner is a kind of control gear being widely used in car combustion engine Chain conveyer or belt drive system, its role is to: for the tension force of the Chain conveyer or belt drive system that keep internal-combustion engine, to reduce the vibration of chain or belt, ensure that it normally works.
As shown in Figure 1, a kind of Hydranlic tensioner being the U.S. Patent Publication of US5819794A in the patent No. announced on October 13rd, 1998 comprises: shell 20, has receiving cavity 23 and the hydraulic oil channel 24 bottom receiving cavity 23; The piston 40 of hollow, is contained in receiving cavity 23 movably, and has hollow hole 42, and shell 20 and piston 40 surround hydraulic pressure cavity 22; One-way valve 100, is positioned at hydraulic pressure cavity 22, and for uni-directionally making hydraulic oil self-hydraulic oil passage 24 flow to hydraulic pressure cavity 22.
Shown in composition graphs 2, one-way valve 100 comprises: spool 1 and valve seat 2.When one-way valve 100 is converted to closed condition (shown in figure) by open mode (not shown), spool 1 moves along the direction A gradually near valve seat 2 until contact with valve seat 2; When one-way valve 100 is converted to open mode by closed condition, spool 1 along the opposite direction movement of direction A to be separated with valve seat 2.Spool 1 is in hollow hemispherical, and the position that valve seat 2 contacts with spool 1 is provided with taper chamfering, makes the contact between one-way valve 100 closed condition lower valve core 1 and valve seat 2 be linear contact lay.
The key factor affecting Hydranlic tensioner performance is: the sealability of one-way valve 100, that is, stop the hydraulic oil in hydraulic pressure cavity 22 to flow to the ability of hydraulic oil channel 24 under one-way valve 100 closed condition.But, due to existing Hydranlic tensioner one-way valve 100 in off position lower valve core 1 and valve seat 2 fail to fit tightly, cause its sealability not good.
The reason causing spool 1 and valve seat 2 to fail to fit tightly comprises: 1) contact with the moment of closing one-way valve 100 at spool 1 with valve seat 2, spool 1 and the valve seat 2 of linear contact lay can be subject to larger contact, and long work can cause both contact positions easily to occur spot corrosion; 2) spool 1 is not high with the surface processing accuracy of valve seat 2; 3) impurity in hydraulic oil is mixed between the contact position of spool 1 and valve seat 2.
In addition, also there is following problem in existing Hydranlic tensioner: first, reduce the working life of one-way valve 100, reason is: when spool 1 moves along the direction A gradually near valve seat 2 with closing one-way valve 100, the travelling speed (claiming the travelling speed under this state of spool to be seating velocity) of spool 1 is larger, speed when causing spool 1 to contact with valve seat 2 is comparatively large, and the contact be subject to when spool 1 is contacted with valve seat 2 is larger;
The second, spool 1 contacts produced noise with valve seat 2 comparatively large and there is the problem that hydraulic oil flows backwards, and reason comprises: the seating velocity of spool 1 is larger; It is linear contact lay between spool 1 and valve seat 2, make contact damping between the two less, these two reasons produce larger noise when not only causing spool 1 to contact with valve seat 2, the back valve core 1 that spool 1 also can be caused to contact with valve seat 2 can along rebounding away from the direction of valve seat 2 gradually, the back valve core 1 of bounce-back finally can fall back valve seat 2 to contact with valve seat 2, in the moment of bounce-back, hydraulic oil can occur and flow backwards.
Summary of the invention
The problem to be solved in the present invention is: when the one-way valve in existing Hydranlic tensioner works long hours, sealability is not good.
For solving the problem, the invention provides a kind of Hydranlic tensioner, comprising: shell, there is receiving cavity and the hydraulic oil channel bottom described receiving cavity; The piston of hollow, be contained in described receiving cavity movably, described shell and piston surround hydraulic pressure cavity; Being positioned at the one-way valve bottom described receiving cavity, flowing to described hydraulic pressure cavity for uni-directionally making hydraulic oil from described hydraulic oil channel; Described one-way valve comprises: spool and valve seat, and described spool can move relative to described valve seat the open and close controlling one-way valve along the direction of its medial axis; Described spool has: sealing surface, when described sealing surface contacts with described valve seat, and described closed check valve, when described sealing surface and described valve seat separate, described one-way valve opens; Described spool also has: portion is ordered about in the rotation be positioned on described sealing surface; Under described one-way valve opens state, the hydraulic oil flowing to described hydraulic pressure cavity from described hydraulic oil channel applies active force to the described rotation portion of ordering about, and rotates around its medial axis to make described spool.
Optionally, the described rotation portion of ordering about has: hydraulic oil force side surface, tilts arranged in a crossed manner with described medial axis; Under described one-way valve opens state, described hydraulic oil force side surface can be subject to the active force making described Spool rotating applied by hydraulic oil.
Optionally, the described rotation portion of ordering about is the groove from the projection of described sealing surface outside projection formation and/or the formation that caves inward from described sealing surface, and described projection does not contact with described valve seat under closed check valve state.
Optionally, described projection is cuboid block, described cuboid block has: the first bottom surface contacted with described sealing surface and be positioned at the bi-side of described first bottom surface along described spool circumference both sides, and one of them side flowed to towards hydraulic oil when described one-way valve opens is described hydraulic oil force side surface.
Optionally, described groove is rectangular slot, described rectangular slot has: the second bottom surface and be positioned at the bi-side of described second bottom surface along described spool circumference both sides, and one of them side flowed to towards hydraulic oil when described one-way valve opens is described hydraulic oil force side surface.
Optionally, the contact between described sealing surface and valve seat is that face contacts.
Optionally, described spool is round table-like, and the position that described valve seat contacts with spool is provided with taper chamfering.
Optionally, the density of described spool is less than steel; Or the material of described spool is plastics that are wear-resistant, resistance to deformation under the high temperature conditions.
Optionally, described one-way valve also comprises: valve gap, the same side of described valve seat is positioned at described spool, described valve gap has: the top cover relative with described spool and the annular sidewall be connected with described top cover, described top cover and annular sidewall surround inner chamber, and described annular sidewall is fixedly arranged on described valve seat away from the end of described top cover; Be positioned at the helical spring of described inner chamber, described helical spring is compressed between described top cover and spool.
Optionally, described top cover is provided with through hole; Described one-way valve also comprises: directional post, extends along towards described top cover side from described spool, and through described through hole, described helical spring is sheathed on outside described directional post.
Optionally, the position of the corresponding described through hole of described top cover is provided with flange, and described flange is positioned at the side of top cover spool dorsad, and during described one-way valve opens, described directional post can move along described flange.
Compared with prior art, technological scheme of the present invention has the following advantages:
Order about portion by arranging rotation in the spool of one-way valve, the hydraulic oil making self-hydraulic oil passage under one-way valve opens state flow to hydraulic pressure cavity orders about Spool rotating.When valve seat contacts with the spool of rotation with closing one-way valve, spool can continue to rotate under the effect of inertia, automatically the sealing surface of valve seat and spool can not only be repaired, the impurity be mixed between valve seat and spool contact position can also be weeded out, valve seat and spool are fit together closely, improves the sealability of one-way valve.
Further, the contact between valve core sealed cover and valve seat be face contact, contact damping between the two can be increased, make spool contact with valve seat after be not easy rebound, can reduce or avoid the generation of hydraulic oil backward flow problem.
Further, the density of spool is less than steel, decreases the inertial force of closed check valve moment spool, and then reduces the noise produced when spool contacts with valve seat.
Further, one-way valve also comprises directional post, makes spool can opposite valve seat moved in coaxial, avoids spool and valve seat bias to contact.Meanwhile, between directional post and top cover through hole, certain frictional damping can be produced, and then the speed realized when spool contacts with valve seat reduces.The noise that the hydraulic oil caused flows backwards, reduction spool produces when contacting with valve seat that rebounds can also be avoided or reduce to the contact that so not only can reduce to be subject to when spool contacts with valve seat, to improve the working life of one-way valve.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of existing a kind of Hydranlic tensioner;
Fig. 2 is the cross-sectional view of one-way valve in Hydranlic tensioner shown in Fig. 1;
Fig. 3 is the cross-sectional view of Hydranlic tensioner in the first embodiment of the present invention;
Fig. 4 is the cross-sectional view of one-way valve in Hydranlic tensioner shown in Fig. 3;
Fig. 5 is the three-dimensional structure diagram of spool in one-way valve shown in Fig. 4;
Fig. 6 is the cross-sectional view of the one-way valve of Hydranlic tensioner in the second embodiment of the present invention;
Fig. 7 is the three-dimensional structure diagram of spool in one-way valve shown in Fig. 6;
Fig. 8 is the cross-sectional view of the one-way valve of Hydranlic tensioner in the third embodiment of the present invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
First embodiment
As shown in Figure 3, the Hydranlic tensioner of the present embodiment comprises: the piston 2 of shell 1, hollow, one-way valve 3, elastic component 4 and spring seat 5.
Shell 1 has receiving cavity 10 and the hydraulic oil channel 11 bottom receiving cavity 10.Piston 2 is contained in receiving cavity 10 movably, and shell 1 and piston 2 surround hydraulic pressure cavity 12.
Elastic component 4 is for being positioned at the helical spring of hydraulic pressure cavity 12, and elastic component 4 is sheathed on outside spring seat 5.Elastic component 4 in compressive state between one-way valve 3 and piston crown 20, and along making piston 2 stretch out the head of the direction A extrusion spring seat 5 outside receiving cavity 10, make the head of spring seat 5 against piston crown 20.In the alternative of the present embodiment, can there is no spring seat 5 yet.In this case, elastic component 4 is directly against piston crown 20.
One-way valve 3 is positioned at the bottom of receiving cavity 10, flows to hydraulic pressure cavity 12 for uni-directionally making hydraulic oil self-hydraulic oil passage 11.Shown in composition graphs 4, one-way valve 3 comprises: spool 31, and in round table-like, spool 31 has sealing surface S, and sealing surface S is the side of round platform; Valve seat 32, the position that valve seat 32 contacts with spool 31 is provided with rounded corners, and contact when one-way valve 3 is closed between spool 31 and valve seat 32 is linear contact lay; Valve gap 33, the same side of valve seat 32 is positioned at spool 31, valve gap 33 has: the top cover 331 relative with spool 31 and the annular sidewall 332 be connected with top cover 331, top cover 331 and annular sidewall 332 surround inner chamber 330, annular sidewall 332 is provided with the through hole 333 be communicated with hydraulic pressure cavity 12 (shown in Fig. 3), and annular sidewall 332 is fixedly arranged on valve seat 32 away from the end of top cover 331; Be positioned at the helical spring 34 of inner chamber 330, helical spring 34 is compressed between top cover 331 and spool 31.
Shown in composition graphs 4 and Fig. 5, spool 31 can move along the direction opposite valve seat 32 of wherein axes O, to control the open and close of one-way valve 3.When sealing surface S contacts (valve seat only contacts with the local location of sealing surface) with valve seat 32, one-way valve 3 is closed; When sealing surface S and valve seat 32 separate, one-way valve 3 is opened.
In addition, spool 31 also has: portion 310 is ordered about in the rotation be positioned on sealing surface S, rotates and orders about the projection that portion 310 is the outside projection formation of selfsealings face S.Under one-way valve 3 closed condition, rotation is ordered about portion 310 and is not contacted with valve seat 32.As shown in Figure 5, rotate and order about portion 310 and have: to exert a force side surface 311 with the medial axis O of spool 31 hydraulic oil arranged in a crossed manner that tilts.
Hydraulic oil force side surface 311 and the medial axis O of spool 31 tilt arranged in a crossed manner referring to: hydraulic oil exerts a force side surface 311 and medial axis O not at grade, define a projection plane, the medial axis O of spool 31 is positioned on described projection plane, hydraulic oil is exerted a force side surface 311 along the direction projection perpendicular to described projection plane, the angle between the upper axes O of projection and described projection plane of hydraulic oil force side surface 311 on described projection plane is acute angle.
Under one-way valve 3 open mode, hydraulic oil force side surface 311 can be subject to the active force applied by hydraulic oil, rotates to make spool 31.The reason will described one-way valve 3 open mode lower valve core 31 in detail and can rotate below.
Shown in composition graphs 3 to Fig. 5, when moving to realize chain or belt (not shown) tensioning function along the direction A stretching out receiving cavity 10 under the squeezing action of piston 2 at elastic component 4 and spring seat 5, the pressure in hydraulic pressure cavity 12 reduces gradually.Once the pressure difference between hydraulic pressure cavity 12 and hydraulic oil channel 11 meets the unlocking condition of one-way valve 3, the pressure that then spool 31 can overcome elastic component 34 moves to be separated with valve seat 32 along direction A, and the hydraulic oil that one-way valve 3 is in open mode, hydraulic oil channel 11 successively flows to hydraulic pressure cavity 12 via the through hole 333 on the gap between spool 31 and valve seat 32, valve gap 33.While hydraulic oil flows through one-way valve 3, the hydraulic oil force side surface 311 that meeting orders about portion 310 to rotation applies active force, and under the effect of this active force, spool 31 can around wherein axes O rotation.
When the tension force of chain or belt is larger, piston 2 can move along the opposite direction in the direction and direction A of stretching into receiving cavity 10, and the pressure in hydraulic pressure cavity 12 is increased gradually.Once the pressure difference between hydraulic pressure cavity 12 and hydraulic oil channel 11 meets the closedown condition of one-way valve 3, then elastic component 34 can extrude spool 31 and make spool 31 along the opposite direction movement of direction A to contact with valve seat 32, makes one-way valve 3 be in closed condition.
When valve seat 32 contacts with the spool 31 rotated, spool 31 can continue to rotate a period of time under the effect of inertia, make: on the one hand, even if the surface processing accuracy of spool 31, valve seat 32 is not high, or spool 31 occurs spot corrosion with the contact position of valve seat 32, under the mutual rubbing action of valve seat 32 with the spool 31 rotated, valve seat 32 also can be polished to realize automatic reparation with the sealing surface of spool 31, and valve seat 32 and spool 31 are fit together more closely; On the other hand, though the impurity in hydraulic oil have be mixed in spool 31 and valve seat 32 contact position between, impurity also can weed out by the spool 31 of rotation, valve seat 32 and spool 31 is fit together closely, and then improves the sealability of one-way valve 3.
Shown in composition graphs 4, Fig. 5, be cuboid block as rotating the projection ordering about portion 310.Described cuboid block has: the first bottom surface (mark) contacted with sealing surface S and be positioned at the bi-side of described first bottom surface along the circumferential both sides of spool 31, and one of them side flowed to towards hydraulic oil when one-way valve 3 is opened is hydraulic oil force side surface 311.The circumference of spool 31 refers to: around the direction of spool 31 medial axis O.
Further, portion 310 is ordered about in rotation, and to be positioned at sealing surface S away from the fringe region of hydraulic oil channel 11 (shown in composition graphs 3), quantity be multiple, multiple projection along the circumferential uniform intervals arrangement of spool 31, and all rotations to order about portion 310 identical relative to the angle of inclination of spool medial axis O.
In existing Hydranlic tensioner, the spool of one-way valve adopts spherical valve core mostly, and the material of spool is steel.Under in valve seat, the present embodiment identical with existing valve seat, spool density is not more than the condition of existing spherical valve core density in the present embodiment, due to the present embodiment adopt the volume of round table-like spool to be less than the volume of existing spherical valve core, and the present embodiment adopt the density of spool to be not more than the density of existing spherical valve core, make the present embodiment adopt the quality of round table-like spool to be less than the quality of existing spherical valve core, reduce the inertial force of closed check valve moment spool 31, and then the noise that produces when spool 31 contacts with valve seat 32 can be reduced.
In addition, the moment opened by one-way valve 3, and the spool 31 gradually away from valve seat 32 likely contacts with top cover 331 and produces noise.Due to the present embodiment adopt the quality of round table-like spool to be less than the quality of existing spherical valve core, therefore, it is possible to reduce the inertial force of one-way valve opens moment spool 31, and then the noise that produces when spool 31 contacts with valve seat 32 can be reduced.
In the present embodiment, the material of valve seat 32 is steel, and the material of spool 31 is plastics that are wear-resistant, resistance to deformation under high temperature (hydraulic oil oil temperature when referring to that Hydranlic tensioner works in hydraulic pressure cavity, this oil temperature is not higher than 120 degree) condition.When spool 31 is made up of this plastics, both the wear extent of spool 31 when one-way valve works long hours can have been reduced, when can prevent again Hydranlic tensioner from working can there is larger distortion in spool 31, and then when avoiding closed check valve, spool 31 and valve seat 32 fail to fit tightly, and ensure that the sealability of one-way valve.The plastics meeting this requirement have multiple, such as PEEK (polyetheretherketone, polyether-ether-ketone) serial plastic, PA66 (also known as nylon66 fiber) serial plastic etc.Certainly, the material manufacture that spool 31 also can be less than steel by color density forms.
In the alternative of the present embodiment, spool 31 also can adopt spherical valve core.In this case, still can be made by the material adopting density to be less than steel spool 31 reach to reduce when spool 31 contacts with valve seat 32 produce the object of noise.
As shown in Figure 4, in the present embodiment, one end that helical spring 34 contacts with spool 31 is fixedly arranged on spool 31, and one end that helical spring 34 contacts with valve gap 33 can be rotated relative to valve gap 33.When spool 31 rotates, can rotate relative to valve gap 33 together with helical spring 34.
In other embodiments, also can be that one end that helical spring 34 contacts with valve gap 33 is fixedly arranged on valve gap 33, one end that helical spring 34 contacts with spool 31 can spool 31 be relative relatively.Can opposed helical spring 34 and valve gap 33 rotate when spool 31 rotates.
Second embodiment
Difference between second embodiment and the first embodiment is: in a second embodiment, shown in composition graphs 6 and Fig. 7, rotate order about portion 310 be selfsealings face S cave inward formation groove; Valve seat 32 is provided with taper chamfering with the contact position of spool 31, makes the contact between spool 31 and valve seat 32 be that face contacts.
Further, as rotating the described groove ordering about portion 310 be: rectangular slot, described groove has the hydraulic oil be obliquely installed with the medial axis O of spool 31 and to exert a force side surface 311, under making one-way valve 3 open mode, the hydraulic oil flowing through one-way valve 3 can apply active force to described groove, to make spool 31 around wherein axes O rotation.
Particularly, described rectangular slot has: the second bottom surface and be positioned at the bi-side of described second bottom surface along the circumferential both sides of spool 31, and one of them side flowed to towards hydraulic oil when one-way valve 3 is opened is hydraulic oil force side surface 311.
As rotating the described groove ordering about portion 310, to be positioned at sealing surface S away from the fringe region of hydraulic oil channel 11 (shown in composition graphs 3), quantity be multiple, multiple groove along the circumferential uniform intervals arrangement of spool 31, and the fluted angle of inclination relative to spool medial axis O identical.
In the present embodiment, when one-way valve 3 is closed, contact with valve seat 32 as rotating a part of ordering about the described groove in portion 310.
Compared with the technological scheme of the first embodiment, the technological scheme of the present embodiment can bring following further beneficial effect: the contact between spool 31 and valve seat 32 is that face contacts, contact damping between the two can be increased, and then following beneficial effect can be brought: on the one hand, spool 31 is not easy to rebound after contacting with valve seat 32, can reduce or avoid the generation of hydraulic oil backward flow problem; Reduce the noise produced when spool 31 contacts with valve seat 32.
3rd embodiment
Difference between 3rd embodiment and the second embodiment is: in the present embodiment, as shown in Figure 8, and it is the projection that selfsealings are formed towards outer projection that portion 310 is ordered about in rotation; The top cover 331 of valve gap 33 is provided with through hole 334; One-way valve 3 also comprises: from spool 31 along extending towards top cover 331 side and passing the directional post 35 of through hole 334, helical spring 34 is sheathed on outside directional post 35.
Compared with the technological scheme of the first embodiment, the technological scheme of the present embodiment can bring following further beneficial effect: at spool 31 along when moving near the direction of valve seat 32 to contact with valve seat 32 gradually, directional post 35 likely contacts with the hole wall of through hole 334, directional post 35 is made to produce certain frictional damping in moving process and between the hole wall of through hole 334, this frictional damping can reduce the travelling speed (claiming the travelling speed under this state of spool to be seating velocity) of spool 31, and speed when spool 31 is contacted with valve seat 32 reduces.The contact that so not only can reduce to be subject to when spool 31 contacts with valve seat 32 is to improve the working life of one-way valve 3, the possibility rebounded after spool 31 contacts with valve seat 32 can also be reduced, the hydraulic oil that avoid or reducing rebounds causes flows backwards, and, the noise produced when spool 31 contacts with valve seat 32 can also be reduced.
In addition, the directional post 35 through through hole 334 can also make spool 31 to move by opposite valve seat 32 coaxial (namely the medial axis of spool 31 is identical with the medial axis of taper chamfering in valve seat 32), avoids spool 31 to contact with valve seat 32 bias.
In addition, directional post 35 also play the guiding role to helical spring 34, is less likely to occur to bend when making helical spring 34 that dilatation occur, and then ensures the stiffness characteristics of helical spring 34.
In order to reduce the seating velocity of spool 31 greatly, the time that directional post 35 contacts with top cover 331 can be extended.Realize these object means and comprise two kinds, the first: the thickness of top cover 331 is arranged thicker; The second, arranges a flange (not shown) in the position of the corresponding through hole of top cover 331 334, and this flange is positioned at the side of top cover 331 spool 31 dorsad, and when one-way valve 3 is opened, directional post 35 can move along described flange.
In the alternative of above-mentioned the first to three embodiment, also above-mentioned projection and groove can be set simultaneously on the sealing surface of spool, the active force that the hydraulic oil flowing through one-way valve under making one-way valve opens state applies to the rotation portion of ordering about is larger, and then makes that spool is easier to be rotated around its medial axis.
It should be noted that, in the inventive solutions, order about the projection in portion, the shape of groove and the position on sealing surface as rotation in spool and should only not be confined to given embodiment.
In the present invention, each embodiment adopts laddering literary style, and emphasis describes the difference with previous embodiment, and the same section in each embodiment can with reference to previous embodiment.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (11)
1. a Hydranlic tensioner, comprising:
Shell, has receiving cavity and the hydraulic oil channel bottom described receiving cavity;
The piston of hollow, be contained in described receiving cavity movably, described shell and piston surround hydraulic pressure cavity;
Being positioned at the one-way valve bottom described receiving cavity, flowing to described hydraulic pressure cavity for uni-directionally making hydraulic oil from described hydraulic oil channel;
Described one-way valve comprises: spool and valve seat, and described spool can move relative to described valve seat the open and close controlling one-way valve along the direction of its medial axis;
Described spool has: sealing surface, when described sealing surface contacts with described valve seat, and described closed check valve, when described sealing surface and described valve seat separate, described one-way valve opens;
It is characterized in that, described spool also has: portion is ordered about in the rotation be positioned on described sealing surface;
Under described one-way valve opens state, the hydraulic oil flowing to described hydraulic pressure cavity from described hydraulic oil channel applies active force to the described rotation portion of ordering about, and rotates around its medial axis to make described spool.
2. Hydranlic tensioner as claimed in claim 1, it is characterized in that, the described rotation portion of ordering about has: hydraulic oil force side surface, tilts arranged in a crossed manner with described medial axis;
Under described one-way valve opens state, described hydraulic oil force side surface can be subject to the active force making described Spool rotating applied by hydraulic oil.
3. Hydranlic tensioner as claimed in claim 2, it is characterized in that, the described rotation portion of ordering about is the groove from the projection of described sealing surface outside projection formation and/or the formation that caves inward from described sealing surface, and described projection does not contact with described valve seat under closed check valve state.
4. Hydranlic tensioner as claimed in claim 3, it is characterized in that, described projection is cuboid block, described cuboid block has: the first bottom surface contacted with described sealing surface and be positioned at the bi-side of described first bottom surface along described spool circumference both sides, and one of them side flowed to towards hydraulic oil when described one-way valve opens is described hydraulic oil force side surface.
5. Hydranlic tensioner as claimed in claim 3, it is characterized in that, described groove is rectangular slot, described rectangular slot has: the second bottom surface and be positioned at the bi-side of described second bottom surface along described spool circumference both sides, and one of them side flowed to towards hydraulic oil when described one-way valve opens is described hydraulic oil force side surface.
6. Hydranlic tensioner as claimed in claim 1, it is characterized in that, the contact between described sealing surface and valve seat is that face contacts.
7. Hydranlic tensioner as claimed in claim 6, it is characterized in that, described spool is round table-like, and the position that described valve seat contacts with spool is provided with taper chamfering.
8. Hydranlic tensioner as claimed in claim 1, it is characterized in that, the density of described spool is less than steel; Or the material of described spool is plastics that are wear-resistant, resistance to deformation under the high temperature conditions.
9. the Hydranlic tensioner as described in any one of claim 1 to 8, is characterized in that, described one-way valve also comprises:
Valve gap, the same side of described valve seat is positioned at described spool, described valve gap has: the top cover relative with described spool and the annular sidewall be connected with described top cover, and described top cover and annular sidewall surround inner chamber, and described annular sidewall is fixedly arranged on described valve seat away from the end of described top cover;
Be positioned at the helical spring of described inner chamber, described helical spring is compressed between described top cover and spool.
10. Hydranlic tensioner as claimed in claim 9, it is characterized in that, described top cover is provided with through hole;
Described one-way valve also comprises: directional post, extends along towards described top cover side from described spool, and through described through hole, described helical spring is sheathed on outside described directional post.
11. Hydranlic tensioners as claimed in claim 10, is characterized in that, the position of the corresponding described through hole of described top cover is provided with flange, and described flange is positioned at the side of top cover spool dorsad, and during described one-way valve opens, described directional post can move along described flange.
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|---|---|---|---|
| CN201410319206.0A CN105370932A (en) | 2014-07-04 | 2014-07-04 | A hydraulic tensioning device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410319206.0A CN105370932A (en) | 2014-07-04 | 2014-07-04 | A hydraulic tensioning device |
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| CN105370932A true CN105370932A (en) | 2016-03-02 |
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| DE102012218893A1 (en) * | 2012-10-17 | 2014-04-17 | Bayerische Motoren Werke Aktiengesellschaft | Hydraulic chain tensioner for tensioning open-loop system of control drive for combustion engine, has piston that is accommodated in leakage gap in inner space of housing in which hydraulic fluid is flowed through non return valve |
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2014
- 2014-07-04 CN CN201410319206.0A patent/CN105370932A/en active Pending
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|---|---|---|---|---|
| US5819794A (en) * | 1996-10-03 | 1998-10-13 | Borg-Warner Automotive, Inc. | Hydraulic tensioner with a contoured disc check valve |
| CN2690695Y (en) * | 2004-04-16 | 2005-04-06 | 程任翔 | Self working check valve |
| CN101479501A (en) * | 2006-06-21 | 2009-07-08 | 博格华纳公司 | Check valve with spring retained ball |
| US20100292036A1 (en) * | 2008-01-24 | 2010-11-18 | Schaeffler Technologies Gmbh & Co. Kg | Tensioning device for the traction mechanism drive in a timing system on a motor vehicle |
| DE102012218893A1 (en) * | 2012-10-17 | 2014-04-17 | Bayerische Motoren Werke Aktiengesellschaft | Hydraulic chain tensioner for tensioning open-loop system of control drive for combustion engine, has piston that is accommodated in leakage gap in inner space of housing in which hydraulic fluid is flowed through non return valve |
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