CN102128240A - Chain tightener - Google Patents
Chain tightener Download PDFInfo
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- CN102128240A CN102128240A CN2011100250713A CN201110025071A CN102128240A CN 102128240 A CN102128240 A CN 102128240A CN 2011100250713 A CN2011100250713 A CN 2011100250713A CN 201110025071 A CN201110025071 A CN 201110025071A CN 102128240 A CN102128240 A CN 102128240A
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Abstract
The present invention provides a chain tightener in which an air discharging groove can be easily machined. A plunger is slidably inserted into a cylinder. An oil supply path for introducing operation oil into a pressure chamber is surrounded by the plunger and a cylinder. A step hole is provided at the cylinder. The step hole is composed of a small-diameter hole part which is communicated with the pressure chamber, and a large-diameter hole part that is connected with the small-diameter hole part. An oil outlet which is branched from the large-diameter hole part and is communicated with outside is provided. A safe valve is provided in the large-diameter hole part. The safety valve is composed of the following components: a sleeve, a valve body which opens and closes a valve hole formed on an end plate, and a valve spring which exerts a force on the valve body. In the chain tightener, a radial clearance is provided between an inner circumference of the large-diameter hole part and an outer circumference of the sleeve, and an outer surface of the end plate is provided with the air discharging groove which communicates the valve hole and the radial clearance.
Description
Technical field
The present invention relates to a kind of chain tensioning device, this chain tensioning device is used to keep the tension force of the synchronization chain that the camshaft to motor car engine drives.
Background technique
Motor car engine generally with the rotation of bent axle via synchronization chain (to call ' chain ' in the following text) to the camshaft transmission, carry out the switching of the valve of firing chamber by the rotation of this camshaft.Here, for the tension force that makes chain remains in the suitable scope, use mostly by being the chain guide portion of center swing and the tension adjusting device of pressing the chain tensioning device of chain to constitute with fulcrum shaft via this chain guide portion signature.
As being slidably inserted into plunger vertically in known open of the chain tensioning device that constitutes this tension adjusting device and the tubular cylinder that the other end is closed just like lower device: Xiang Yiduan, and be provided with to the return spring of the direction of giving prominence to this plunger application of force from cylinder, and the fuel feeding path that imports working oil in the pressure chamber that above-mentioned plunger and cylinder surround is set, be provided with in the end of the pressure chamber of this fuel feeding path side and only allow working oil from the one-way valve (Fig. 1 of patent documentation 1,2) of fuel feeding passage side to pressure chamber's side flow.
When the tension force of this chain tensioning device chain in the work of motor becomes big, utilize the tension force of this chain that the direction (to call ' be pressed into direction ') of plunger in being pressed into cylinder moved, to absorb the tensioning of chain.At this moment the working oil in the pressure chamber flows out by the leakage-gap between plunger and cylinder slip surface, makes plunger slowly move because the viscous resistance of this working oil produces damping function.
On the other hand, when the tension force of chain diminishes in the work of motor, utilize the active force of return spring to make plunger to moving, to absorb the lax of chain from the outstanding direction (to call ' projected direction ' in the following text) of cylinder.At this moment one-way valve is opened, owing in the pressure chamber, flow into working oil from the fuel feeding path, thus the plunger fast moving.
And this chain tensioning device is provided with safety valve in order to prevent chain from becoming the overtension state under the situation of the unexpected tensioning of chain, and the pressure of this safety valve in the pressure chamber is compared predefined pressure indoor pressure of drain pressure when also big.
Particularly, step hole is set in cylinder, this step hole by the path hole portion that is communicated with the pressure chamber with constitute with the big footpath hole portion that this path hole portion is connected via stepped part, and be provided with from this big footpath bore portion trouble and with the oil drainage hole of external communications, in the hole portion of above-mentioned big footpath, assembled safety valve, discharged working oil from path hole portion to oil drainage hole when also big to compare predetermined pressure at the pressure of pressure chamber.
In addition, the formation of this safety valve possesses: sleeve, and it possesses the end plate of the stepped part supporting of using step hole at the one end; Spherical valve body, its inboard from sleeve opens and closes the valve opening that is formed on the end plate; Valve spring, its to this valve body to closing the valve direction application of force; And access, it makes the working oil in the sleeve flow out to oil drainage hole.On the internal surface of end plate, be formed with the valve seat surface of taking a seat for the valve body of safety valve.
The pressure of this chain tensioning device in the pressure chamber is compared predetermined pressure when also big, and the valve body of safety valve P is left to open valve opening from valve seat surface, and working oil is discharged to oil drainage hole from path hole portion.When the pressure in the pressure chamber is compared predetermined pressure in the pressure chamber when also little, make the valve body of safety valve be seated at valve seat surface with the sealing valve opening based on the active force of valve spring.
But, this chain tensioning device can occur when engine start from the situation of oil pump entrained air to the working oil that the pressure chamber supplies with, under this situation when the tension force of chain becomes big, because by to the compression that is blended into the air in the pressure chamber and plunger moves, so the damping function of chain tensioning device reduces.
In order to prevent reducing of this damping function, known a kind of chain tensioning device (Fig. 5 of patent documentation 2,6) that is used for the indoor air of head pressure that is provided with.This chain tensioning device is on the valve seat surface of taking a seat for the valve body of safety valve, and formation is communicated with the air drain tank of getting up with valve opening and sleeve inboard, and via the indoor air of this drain tank head pressure.
Patent documentation 1: TOHKEMY 2004-176821 communique
Patent documentation 2: TOHKEMY 2005-180484 communique
Summary of the invention
But, be shown on the valve seat surface of taking a seat as patent documentation 2 and be provided with under the situation of air drain tank for the valve body of safety valve P, because the shape of valve seat surface is the shape to the valve opening depression, therefore be difficult in processing air drain tank on the valve seat surface.Especially the end plate at sleeve and safety valve forms under the situation of one, because valve seat surface is arranged in sleeve, therefore is difficult to sheet plane processing air drain tank.And, when the air drain tank is arranged, also have the possibility of the durability decline of valve seat surface on valve seat surface.
The problem that the present invention will solve provides a kind of chain tensioning device of easy processing air drain tank.
In order to solve above-mentioned problem, between the periphery of interior week of above-mentioned big footpath hole portion and above-mentioned sleeve, the radial clearance that is communicated with above-mentioned oil drainage hole is set, the air drain tank that above-mentioned valve opening and above-mentioned radial clearance is communicated with in the outer surface formation of above-mentioned end plate.So, because the air drain tank at the outer surface of end plate, is therefore compared the easier processing air of the situation drain tank that forms the air drain tank on valve seat surface.
Above-mentioned air drain tank preferably forms a plurality of.So under the situation that stopping up appears in any one air drain tank, also can pass through other air drain tank exhausting airs, so exhausting air steadily in the long term.
Above-mentioned air drain tank can form in the mode that vortex shape extends.So, because the flow path length of air drain tank is elongated, the flow path resistance of working oil in the air drain tank becomes big, can suppress owing to the increase that the oil consumption that the air drain tank causes is set.Above-mentioned air drain tank can be made as circular groove or V groove.
But the pressure of high engine speeds when rotation pressure chamber vibrates with high frequency, and valve body that might safety valve does not follow the tracks of its variation in pressure but safety valve directly becomes the state of opening.In this case, if become many by the working oil flow of safety valve, then the damping function of chain tensioning device descends, and the amplitude of plunger increases.Therefore in order to reduce the oil consumption in the chain tensioning device, above-mentioned safety valve can adopt following formation.
1) above-mentioned end plate and above-mentioned sleeve are formed with split, this end plate is pressed into and is fixed in above-mentioned sleeve, and shut and sleeve shape that the end with above-mentioned end plate opposition side of above-mentioned sleeve is sealed are become one, the integrally formed bar that the amount of movement of above-mentioned valve body is limited on this shut.
2) above-mentioned end plate and above-mentioned sleeve are formed with split, this end plate is pressed into and is fixed in above-mentioned sleeve, and shut and sleeve that the end with above-mentioned end plate opposition side of above-mentioned sleeve is sealed are formed with split, this shut be pressed into and be fixed in above-mentioned sleeve, and on this shut the integrally formed bar that the amount of movement of above-mentioned valve body is limited.
3) above-mentioned end plate and above-mentioned sleeve are formed with split, this end plate is pressed into and is fixed in above-mentioned sleeve, shut and sleeve shape that the end with above-mentioned end plate opposition side of above-mentioned sleeve is sealed are become one, on this shut, through hole is set, on this through hole, is pressed into and the fixing bar that the amount of movement of above-mentioned valve body is limited.
4) above-mentioned end plate and above-mentioned sleeve are formed with split, this end plate is pressed into and is fixed in above-mentioned sleeve, shut and sleeve shape that the end with above-mentioned end plate opposition side of above-mentioned sleeve is sealed are become one, the spring seat of above-mentioned valve spring is born in assembling in above-mentioned sleeve, and on this spring seat the integrally formed bar that the amount of movement of above-mentioned valve body is limited.
5) above-mentioned end plate and above-mentioned sleeve are formed with split, this end plate is pressed into and is fixed in above-mentioned sleeve, shut and sleeve shape that the end with above-mentioned end plate opposition side of above-mentioned sleeve is sealed are become one, the bar of the amount of movement of integrally formed and above-mentioned shut butt on above-mentioned valve body and limiting valve body.
6) above-mentioned end plate and above-mentioned sleeve shape are become one, cover cap and above-mentioned sleeve that the end with above-mentioned end plate opposition side of above-mentioned sleeve is sealed are formed with split, constituting of this cover cap: the screw section, its internal thread with the interior week that is formed on above-mentioned big footpath hole portion fastens with screw thread; Be pressed into portion, it is pressed into above-mentioned sleeve; And bar, it limits the amount of movement of above-mentioned valve body.
If adopt above-mentioned 1) to 6) formation, limited the amount of movement of the valve body of safety valve with bar, so also can suppress flow during the high engine speeds rotation by the working oil of safety valve, be difficult to take place the decline of damping function.
In addition, as existing chain tensioning device, be provided with under the situation of air drain tank at the valve seat surface of taking a seat for the valve body of safety valve, end plate and sleeve split are formed, but it is as shown in the present, form at the outer surface of end plate under the situation of air drain tank, as above-mentioned 6) shown in end plate and above-mentioned sleeve shape are become one, therefore can realize commonization of parts.
The length of bar can be set to the amount of movement of above-mentioned valve body is limited in below the 0.5mm.
The chain tensioning device of this invention is because the air drain tank is at the outer surface of end plate, so compare the easier air drain tank that processes of situation that forms the air drain tank on valve seat surface.And, compare that to form the durability of situation valve seat surface of air drain tank at valve seat surface higher.
Description of drawings
Fig. 1 is the plan view of chain transmission that the chain tensioning device of the 1st mode of execution of the present invention has been assembled in expression.
Fig. 2 is near the amplification view of safety valve of Fig. 1.
Fig. 3 is the sectional view along the III-III line of Fig. 2.
Fig. 4 is other routine sectional views of the air drain tank of presentation graphs 3.
Fig. 5 (a) is the sectional view along the V-V line of Fig. 3, (b) is other routine sectional views of air drain tank of expression (a), (c) is the sectional view of another one example of the air drain tank of expression (a).
Fig. 6 is other routine sectional views of expression safety valve shown in Figure 2.
Fig. 7 is the sectional view of the another one example of expression safety valve shown in Figure 2.
Fig. 8 is the sectional view of the another one example of expression safety valve shown in Figure 2.
Fig. 9 is the sectional view of the another one example of expression safety valve shown in Figure 2.
Figure 10 is the sectional view of the another one example of expression safety valve shown in Figure 2.
Figure 11 is the amplification view of the chain tensioning device of expression the 2nd mode of execution of the present invention.
Label declaration
1... chain tensioning device; 9... cylinder; 10... plunger; 12... pressure chamber; 13... fuel feeding path; 14... one-way valve; 16... step hole; 16A... path hole portion; 16B... big directly hole portion; 17... stepped part; 18... oil drainage hole; 19... safety valve; 21... internal thread; 22... end plate; 23... sleeve; 24... valve opening; 25... valve body; 26... valve spring; 27... access; 29... shut; 30... bar; 31... radial clearance; 32... air drain tank; 33... return spring; 39... through hole; 40... spring seat; 41... cover cap; 42... screw section; 43... be pressed into portion; 51... chain tensioning device.
Embodiment
Fig. 1 has represented to install the chain transmission of the chain tensioning device l of the 1st mode of execution of the present invention.In this chain transmission, the sprocket wheel 3 that is fixed on the bent axle 2 of motor is connected via chain 6 with sprocket wheel 5 on being fixed on camshaft 4, this chain 6 transmits the rotation of bent axle 2 to camshaft 4, carry out the switching of the valve (not shown) of firing chamber based on the rotation of this camshaft 4.
To have be the chain guide portion 8 that swingingly support at the center with fulcrum shaft 7 in contact on chain 6, and chain tensioning device 1 is given as security pressure chains 6 via this chain guide portion 8.
Plunger 10 form insertions to cylinder 9 in the insertion end opening bottom tube-like arranged.Be formed with fuel feeding path 13 on the closed end of cylinder 9, this fuel feeding path 13 is communicated with the pressure chamber 12 that is surrounded by cylinder 9 and plunger 10.Fuel feeding path 13 is connected with oil pump (not shown), and the working oil of sending from this oil pump is imported in pressure chamber 12.In the end of the pressure chamber of fuel feeding path 13 12 sides, be provided with and only allow the one-way valve 14 of working oil from fuel feeding path lateral pressure chambers 13 12 side flow.
Between the slip surface of plunger 10 and cylinder 9, be formed with leakage-gap 15, the working oil in the pressure chamber 12 flowed out by this leakage-gap 15.
As shown in Figure 2, on cylinder 9, be provided with the surperficial from it step hole 16 that extends to pressure chamber 12 downwards.Step hole 16 by the path hole 16A of portion that is communicated with pressure chamber 12 with constitute via the 16B of big footpath hole portion that stepped part 17 is connected with the path hole 16A of portion.Be formed with oil drainage hole 18 midway with external communications from diverging of the 16B of big footpath hole portion.
In the big footpath hole 16B of portion, assemble safety valve 19 and clamping bolt 20 successively.Clamping bolt 20 fastens with the internal thread 21 that is formed on week in the 16B of big footpath hole portion.Safety valve 19 is given as security and is pressed and be fixed on the stepped part 17 of step hole 16 based on the clamping of this clamping bolt 20.
Constituting of safety valve 19: sleeve 23, one end have the end plate 22 of stepped part 17 supportings that are subjected to step hole 16; Spherical valve body 25, its valve opening 24 that will be formed on the end plate 22 opens and closes from the inboard of sleeve 23; Valve spring 26, its to this valve body 25 to closing the valve direction application of force; With access 27, it makes the working oil in the sleeve 23 flow out to oil drainage hole 18.Access 27 forms from the inside Zhou Guantong of the periphery of sleeve 23.
Valve spring 26 is helical springs.One end of this valve spring 26 is by shut 29 supportings of sleeve 23, and the other end is given as security and pressed valve body 25.Press valve body 25 to closing the valve direction application of force based on this signature.Valve spring 26 and bar 30 are configured to same axis.
When the pressure of pressure chamber 12 is compared predetermined pressure when also big, this safety valve 9 leaves and open valve opening 24 from valve seat surface 28 based on the valve body 25 of its pressure relief valve 19, and working oil is discharged to oil drainage hole 18 by the inside and the access 27 of sleeve 23 successively from the path hole 16A of portion.At this moment, the front end of bar 30 stops valve body 25 and the amount of movement of limiting valve body 25, thereby restraint of labour oil is by the flow of valve opening 24.On the other hand, the pressure in the pressure chamber 12 are compared predetermined pressure when also little, and the valve body 25 of safety valve 19 is seated at valve seat surface 28 and seals valve opening 24 based on the active force of valve spring 26.
Between the periphery of the interior week of the big footpath hole 16B of portion and sleeve 23, be provided with the radial clearance 31 that is communicated with oil drainage hole 18.And, as shown in Figure 3,, be formed with a plurality of air drain tanks 32 that outside radial direction, extend to the periphery of end plate 22 from valve opening 24 at the outer surface of end plate 22, be communicated with via these air drain tank 32 man's cap used in ancient times holes 24 and radial clearance 31.Air drain tank 32 can be that the cross section shown in Fig. 5 (a) is tetragonal chamfered groove, also can be that the cross section shown in Fig. 5 (b) is the V groove of V-arrangement, can also be that the cross section shown in Fig. 5 (c) is semicircular circular groove.
As shown in Figure 1, with being installed in 33 pairs of plungers 10 of return spring in the pressure chamber 12 to from the outstanding direction application of force of cylinder 9.One end of return spring 33 is supported by one-way valve 14, and the other end is given as security and pressed plunger 10.Plunger 10 from cylinder 9 outstanding protruding terminus and chain guide portion 8 butts.
On the interior week of cylinder 9, be formed with the accommodating groove 34 of ring-type, in this accommodating groove 34 having taken in positioning ring 35 in axially movable mode.Positioning ring 35 annular shape, and resiliently deformable diametrically for a circumference part is cut.The periphery of 35 pairs of plungers 10 of this positioning ring is carried out elasticity and is clamped, and separates any one fastening in a plurality of circumferential grooves 36 that certain intervals forms vertically with periphery at plunger 10.
In each circumferential groove 36, be provided with: conical surface 37, it makes positioning ring 35 hole enlargements when being applied with the load of projected direction on plunger 10 and allows moving of plunger 10; With baffle-panels 38, when it is applied with the load that is pressed into direction on plunger 10 positioning ring 35 carried out fastening and limit moving of plunger 10.
The following describes the action example of this chain tensioning device 1.
When the tension force of chain 6 increases in motor action, based on the tension force of this chain 6 and plunger 10 moves to the direction that is pressed into, absorb the tensioning of chain 6.At this moment, because the 12 working oil viscous resistances that flow out produce damping force from the pressure chamber by leakage-gap 15, so plunger 10 slowly moves.
When the tension force of chain 6 reduces in motor action, based on the active force of return spring 33 and plunger 10 moves to projected direction, absorb the lax of chain 6.At this moment because one-way valve 14 is opened working oil in fuel feeding path feed pressure chambers 12 13, so plunger 10 fast moving.
Here, when plunger 10 moved forward and backward repeatedly owing to the vibration of chain 6, positioning ring 35 moved forward and backward in accommodating groove 34.And because chain 6 lax and plunger 10 be when the moving range on the projected direction surpasses the moving range of positioning ring 35 accommodating groove 34 in, the conical surface 37 of circumferential groove 36 makes positioning ring 35 draw together the footpath, to allow the mobile of plunger 10.At this moment, positioning ring 35 and adjacent circumferential groove 36 fasten.
And when motor resonance takes place and the tension force of chain 6 when sharply increasing, safety valve 19 is opened, and the pressure of head pressure chamber 12 is to prevent the overtension of chain 6.
During the high engine speeds rotation, because the vibration of the high frequency of the pressure of pressure chamber 12, the valve body 25 of safety valve 19 can't be followed the tracks of its variation in pressure, and exists safety valve 19 to become the possibility of the state of opening.In this case, many as if the flow of the working oil of passing through safety valve 19, then the damping function of chain tensioning device 1 descends, and the amplitude of plunger 10 increases.But,, be difficult to take place the decline of damping function because therefore the amount of movement of these chain tensioning device 1 usefulness bar 30 limiting valve bodies 25 has suppressed the flow by the working oil of safety valve 19.
When motor stops, occurring the big situation of tension force change of chain 6 sometimes owing to the stop position of camshaft 4,, prevent that plunger 10 from moving to being pressed into direction in this case based on the fastening of positioning ring 35 and circumferential groove 36.Therefore, when resetting motor, be difficult to the lax of chain 6 taken place, can successfully pilot engine.
And when shutting engine down, oil pump stops and the pasta of working oil in the fuel feeding path 13 descends.So, situation by fuel feeding path 13 entrained air in the working oil that pressure chamber 12 supplies with can appear when resetting motor, in this case, the air that are blended in the pressure chamber 12 are discharged to the outside by the path hole 16A of portion, air drain tank 32, radial clearance 31, oil drainage hole 18 successively.So, the decline of the damping function that caused by the air in the pressure chamber 12 be difficult to take place.
Because air drain tank 32 is positioned at the outer surface of end plate 22, so this chain tensioning device 1 is compared the easier air drain tank 32 that processes with the situation that forms air drain tank 32 on valve seat surface 28.And, to compare with the situation that on valve seat surface 28, forms air drain tank 32, the durability of valve seat surface 28 is higher.
And this chain tensioning device 1 is owing to have a plurality of air drain tanks 32, even therefore under the situation that any one air drain tank 32 stops up, also can pass through other air drain tank 32 exhausting airs.Therefore, exhausting air steadily in the long term.
In the above-described embodiment, formed air drain tank 32 in the mode of extending, but as shown in Figure 4, air drain tank 32 can form also with vortex shape to the radial direction outside.Therefore so, the flow path length of air drain tank 32 is elongated, and the flow path resistance of working oil becomes big in air drain tank 32, can suppress owing to the increase that the oil consumption in the chain tensioning device 1 that air drain tank 32 causes is set.In this case, air drain tank 32 also can adopt chamfered groove, circular groove, V groove etc.
And, sleeve 23 and shut 29 form one in the above-described embodiment, but also can be as shown in Figure 6 shut 29 and sleeve 23 splits be formed, this shut 29 is pressed into is fixed on the sleeve 23, and the bar 30 of the amount of movement of this shut 29 and limiting valve body 25 is formed one.So form bar 30 easily.At this moment, can use ferrous material as the material of bar 30, if then can utilize injection molded to form bar 30 with resin material, so cost is low.
And, as shown in Figure 7,, and on this through hole 39, be pressed into the fixing bar 30 that the amount of movement of valve body 25 is limited even through hole 39 is set forming on the shut 29 of one with sleeve 23, also can form bar 30 easily.In this case, as the material of bar 30, if then can utilize injection molded to form bar 30 with resin material, so cost is low.
And, as shown in Figure 8, also shut 29 and sleeve 23 can be formed one, assembling is used to bear the spring seat 40 of valve spring 26 in sleeve 23, and forms one at the bar 30 of the amount of movement that makes this spring seat 40 and limiting valve body 25.So, can directly utilize the sleeve 23 of safety valve in the past, so cost is low.
And, as shown in Figure 9, also can on valve body 25, form the bar 30 of the amount of movement of limiting valve body 25 with shut 29 butts in the one mode.Here, valve body 25 by the contact or leave the 25A of hemisphere portion of the valve seat surface 28 of end plate 22, the bar 30 that is connected with the 25A of this hemisphere portion constitutes.The diameter of the 25A of hemisphere portion is bigger than the diameter of bar 30, bears an end of valve spring 26 at the end face of bar 30 sides of the 25A of hemisphere portion.Even like this, also can directly utilize the sleeve 23 of safety valve in the past, so cost is low.
And, as shown in figure 10, also end plate 22 and sleeve 23 can be formed one, and will cover cap 41 and sleeve 23 splits that the end with end plate 22 opposition sides of sleeve 23 is sealed be formed.Here, the constituting of cover cap 41: screw section 42, it fastens with internal thread 21 screw threads on the interior week that is formed on the 16B of big footpath hole portion; Be pressed into portion 43, it is pressed into sleeve 23; With bar 30, the amount of movement of its limiting valve body 25.So do not need clamping bolt 20.And, when this safety valve 19 of assembling, determine based on the fastening of screw section 42 and internal thread 21 whether the center of sleeve 23 is positioned the center of the big footpath hole 16B of portion, therefore can stably form the radial clearance 31 between the periphery of the interior week of the 16B of big footpath hole portion and sleeve 23.And, owing to do not need clamping bolt 20, therefore can correspondingly reduce the parts number of packages, can improve the operability of assembling.
The chain tensioning device 51 of in Figure 11, having represented the 2nd mode of execution of this invention.The part corresponding with the 1st mode of execution marked identical label and omitted explanation.
In the pressure chamber that surrounds by cylinder 9 and plunger 10, be equipped with return spring 33.One end of return spring 33 is supported by screw rod 54, and the other end is given as security compression leg plug 10 via spring seat 68, gives as security based on this and presses plunger 10 to the direction application of force of giving prominence to from cylinder 9.
In cylinder 9, similarly be provided with from the upper surface to the pressure chamber 12 step hole 16 with the 1st mode of execution.In the 16B of hole portion of the big footpath of step hole 16, assembled the safety valve 19 same with the 1st mode of execution.Between the periphery of the interior week of the big footpath hole 16B of portion and sleeve 23, be provided with the radial clearance 31 that is communicated with oil drainage hole 18.And, be formed with air drain tank 32 at the outer surface of end plate 22.
The action example of this chain tensioning device 51 is described.
When the tension force of chain 6 increases in engine operation, based on the tension force of this chain 6 and plunger 10 moves to being pressed into direction, absorb the tensioning of chain 6.At this moment, move forward and backward repeatedly in the scope of screw rod 64 axial clearance between internal thread 62 and outside thread 63 owing to the vibration of chain 6, and with respect to plunger 10 rotations.And owing to produce damping force by the viscous resistance of leakage-gap 16 12 working oil that flow out from the pressure chamber, so plunger 10 slowly moves.
When the tension force of chain 6 reduces in engine operation, based on the active force of return spring 33 and plunger 10 moves to projected direction, absorb the lax of chain 6.At this moment, engine oil is from fuel feeding path feed pressure chambers 12 13 because one-way valve 14 is opened, so plunger 10 fast moving.
And resonance takes place and the tension force of chain 6 when sharply increasing in motor, and safety valve 11 is open, and the pressure of head pressure chamber 12 is to prevent the overtension of chain 6.
When motor stops, becoming big situation because the tension force of chain 6 can appear in the stop position of camshaft 4 sometimes, at this moment because chain 6 does not vibrate, the internal thread 52 of plunger 10 is prevented that by the outside thread combination of bar 54 plunger 10 from moving to being pressed into direction.Therefore, be difficult to when resetting motor the lax of chain 6 taken place, can pilot engine smoothly.
And when shutting engine down, oil pump stops and the pasta of working oil in the fuel feeding path 13 descends.Therefore, situation by fuel feeding path 13 entrained air in the working oil that pressure chamber 12 supplies with can appear when resetting motor, in this case, the air that are blended in the pressure chamber 12 are discharged to the outside by the path hole 16A of portion, air drain tank 32, radial clearance 31, oil drainage hole 18 successively.So, the decline of the damping function that caused by the air in the pressure chamber 12 be difficult to take place.
This chain tensioning device 61 and the 1st mode of execution are same, and air drain tank 32 is positioned at the outer surface of end plate 22, therefore process air drain tank 32 easily, and the durability of valve seat surface 28 is also high.Other effects are also identical with the 1st mode of execution.
Claims (11)
1. a chain tensioning device is characterized in that,
Insert plunger (10) in the mode that can slide vertically in the cylinder (9) of the tubular of the opening and the other end sealing at one end,
Be provided with the return spring (33) of this plunger (10) to the direction application of force of giving prominence to from cylinder (9),
The fuel feeding path (13) that imports working oil in the pressure chamber (12) that is surrounded by above-mentioned plunger (10) and cylinder (9) is set,
In the end of the pressure chamber (12) of this fuel feeding path (13) side, be provided with and only allow the one-way valve (14) of working oil from fuel feeding path (13) lateral pressure chamber (12) side flow,
Step hole (16) is set on above-mentioned cylinder (9), and this step hole (16) is by path hole portion (16A) that is communicated with above-mentioned pressure chamber (12) and big footpath hole portion (16B) formation that is connected with this path hole portion (16A) via stepped part (17),
Setting from this big footpath hole portion (16B) fork and with the oil drainage hole (18) of external communications,
Assembling safety valve (19) in above-mentioned big footpath hole portion (16B), this safety valve (19) makes working oil discharge to above-mentioned oil drainage hole (18) from above-mentioned path hole portion (16A) at the pressure of above-mentioned pressure chamber (12) during greater than predetermined pressure,
Constituting of this safety valve (19): sleeve (23), one end have the end plate (22) of stepped part (17) supporting that is subjected to above-mentioned step hole (16); Valve body (25), it opens and closes from the inboard of sleeve (23) the valve opening (24) that is formed on the above-mentioned end plate (22); Valve spring (26), its to this valve body (25) to closing the valve direction application of force; And access (27), it makes the working oil in the above-mentioned sleeve (23) flow out to above-mentioned oil drainage hole (18),
Between the periphery of interior week of above-mentioned big footpath hole portion (16B) and above-mentioned sleeve (23), the radial clearance (31) that is communicated with above-mentioned oil drainage hole (18) is set, and the outer surface in above-mentioned end plate (22), formation is communicated with the air drain tank (32) of getting up with above-mentioned valve opening (24) and above-mentioned radial clearance (31).
2. chain tensioning device according to claim 1 is characterized in that,
Above-mentioned air drain tank (32) is formed with a plurality of.
3. chain tensioning device according to claim 1 and 2 is characterized in that,
Above-mentioned air drain tank (32) forms with vortex shape and extends.
4. according to each described chain tensioning device in the claim 1 to 3, it is characterized in that,
Above-mentioned air drain tank (32) is circular groove or V groove.
5. according to each described chain tensioning device in the claim 1 to 4, it is characterized in that,
Above-mentioned end plate (22) and above-mentioned sleeve (23) form with split,
This end plate (22) is pressed into and is fixed in above-mentioned sleeve (23),
Shut (29) and sleeve (23) that the end with above-mentioned end plate (22) opposition side of above-mentioned sleeve (23) is sealed form as one,
At the last integrally formed bar (30) that the amount of movement of above-mentioned valve body (25) is limited of this shut (29).
6. according to each described chain tensioning device in the last claim 1 to 4, it is characterized in that,
Above-mentioned end plate (22) and above-mentioned sleeve (23) form with split,
This end plate (22) is pressed into and is fixed in above-mentioned sleeve (23),
Shut (29) and sleeve (23) that the end with above-mentioned end plate (22) opposition side of above-mentioned sleeve (23) is sealed form with split,
This shut (29) is pressed into and is fixed in above-mentioned sleeve (23),
At the last integrally formed bar (30) that the amount of movement of above-mentioned valve body (25) is limited of this shut (29).
7. according to each described chain tensioning device in the claim 1 to 4, it is characterized in that,
Above-mentioned end plate (22) and above-mentioned sleeve (23) form with split,
This end plate (22) is pressed into and is fixed in above-mentioned sleeve (23),
Shut (29) and sleeve (23) that the end with above-mentioned end plate (22) opposition side of above-mentioned sleeve (23) is sealed form as one,
Through hole (39) is set on this shut (29),
On this through hole (39), be pressed into and the fixing bar (30) that the amount of movement of above-mentioned valve body (25) is limited.
8. according to each described chain tensioning device in the claim 1 to 4, it is characterized in that,
Above-mentioned end plate (22) and above-mentioned sleeve (23) form with split,
This end plate (22) is pressed into and is fixed in above-mentioned sleeve (23),
Shut (29) and sleeve (23) that the end with above-mentioned end plate (22) opposition side of above-mentioned sleeve (23) is sealed form as one,
Assembling is used to bear the spring seat (40) of above-mentioned valve spring (26) in above-mentioned sleeve (23),
At the last integrally formed bar (30) that the amount of movement of above-mentioned valve body (25) is limited of this spring seat (40).
9. according to each described chain tensioning device in the claim 1 to 4, it is characterized in that,
Above-mentioned end plate (22) and above-mentioned sleeve (23) form with split,
This end plate (22) is pressed into and is fixed in above-mentioned sleeve (23),
Shut (29) and sleeve (23) that the end with above-mentioned end plate (22) opposition side of above-mentioned sleeve (23) is sealed form as one,
Go up integrally formed and above-mentioned shut (29) butt and the bar (30) of the amount of movement of limiting valve body (25) at above-mentioned valve body (25).
10. according to each described chain tensioning device in the claim 1 to 4, it is characterized in that,
Above-mentioned end plate (22) and above-mentioned sleeve (23) form as one,
Cover cap (41) and above-mentioned sleeve (23) that the end with above-mentioned end plate (22) opposition side of above-mentioned sleeve (23) is sealed form with split,
Constituting of this cover cap (41): screw section (42), it fastens with internal thread (21) screw thread that is formed on interior week of above-mentioned big footpath hole portion (16B); Be pressed into portion (43), it is pressed into above-mentioned sleeve (23); And bar (30), its amount of movement to above-mentioned valve body (25) limits.
11. according to each described chain tensioning device in the claim 5 to 10, it is characterized in that,
The length of above-mentioned bar (30) is set to the amount of movement of above-mentioned valve body (25) is limited in below the 0.5mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010010061A JP5561584B2 (en) | 2010-01-20 | 2010-01-20 | Chain tensioner |
| JP2010-010061 | 2010-01-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102128240A true CN102128240A (en) | 2011-07-20 |
Family
ID=44266453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100250713A Pending CN102128240A (en) | 2010-01-20 | 2011-01-18 | Chain tightener |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5561584B2 (en) |
| CN (1) | CN102128240A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105736657A (en) * | 2014-12-24 | 2016-07-06 | 株式会社椿本链条 | Chain tensioner |
| CN106439142A (en) * | 2016-10-31 | 2017-02-22 | 绵阳富临精工机械股份有限公司 | Constant pressure control valve |
| CN106481760A (en) * | 2015-08-25 | 2017-03-08 | 株式会社椿本链条 | Tensioning apparatus |
| CN107869558A (en) * | 2016-09-26 | 2018-04-03 | 株式会社椿本链条 | Tensioning apparatus |
| CN114761673A (en) * | 2019-11-29 | 2022-07-15 | 株式会社电装 | Valve timing adjusting device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7177345B2 (en) * | 2017-12-22 | 2022-11-24 | 株式会社椿本チエイン | tensioner |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001021013A (en) * | 1999-07-06 | 2001-01-26 | Borg Warner Automotive Kk | Hydraulic tensioner |
| JP4243793B2 (en) * | 2002-11-27 | 2009-03-25 | Ｎｔｎ株式会社 | Chain tensioner |
| JP4266803B2 (en) * | 2003-12-16 | 2009-05-20 | Ｎｔｎ株式会社 | Chain tensioner |
| JP3642527B1 (en) * | 2004-05-31 | 2005-04-27 | 株式会社椿本チエイン | Hydraulic tensioner |
| JP4451314B2 (en) * | 2005-01-04 | 2010-04-14 | 本田技研工業株式会社 | Hydraulic tensioner |
| JP4786364B2 (en) * | 2006-02-17 | 2011-10-05 | Ｎｔｎ株式会社 | Chain tensioner |
-
2010
- 2010-01-20 JP JP2010010061A patent/JP5561584B2/en active Active
-
2011
- 2011-01-18 CN CN2011100250713A patent/CN102128240A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105736657A (en) * | 2014-12-24 | 2016-07-06 | 株式会社椿本链条 | Chain tensioner |
| US10024401B2 (en) | 2014-12-24 | 2018-07-17 | Tsubakimoto Chain Co. | Chain tensioner |
| CN106481760A (en) * | 2015-08-25 | 2017-03-08 | 株式会社椿本链条 | Tensioning apparatus |
| CN107869558A (en) * | 2016-09-26 | 2018-04-03 | 株式会社椿本链条 | Tensioning apparatus |
| CN107869558B (en) * | 2016-09-26 | 2020-06-23 | 株式会社椿本链条 | Tension device |
| CN106439142A (en) * | 2016-10-31 | 2017-02-22 | 绵阳富临精工机械股份有限公司 | Constant pressure control valve |
| CN114761673A (en) * | 2019-11-29 | 2022-07-15 | 株式会社电装 | Valve timing adjusting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011149466A (en) | 2011-08-04 |
| JP5561584B2 (en) | 2014-07-30 |
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Application publication date: 20110720 |