CN203442010U - One-way clutch used for automobile hydraulic torque converter - Google Patents

Abstract

The utility model discloses a one-way clutch used for an automobile hydraulic torque converter. The one-way clutch comprises a wedge wheel, rollers, reeds and fixed shaft sleeves, wherein the wedge wheel is arranged outside the fixed shaft sleeves in a sleeved mode, a plurality of eccentric arcs are distributed on the inner surface of the wedge wheel, after the wedge wheel is matched with the fixed shaft sleeves, each eccentric arc and the outer surface of the corresponding fixed shaft sleeve form a wedge-shaped space which is used for containing the corresponding roller and has the width gradually narrowed, one end of each reed is arranged on the wider side inside the corresponding wedge-shaped space, and the other end of each reed abuts against the corresponding roller. Compared with an existing wedge type one-way clutch, the one-way clutch has the advantages of being simple in structure, easy to manufacture, low in cost, good in anti-abrasion performance and reliable in work.

Description

A kind of automobile torque converter overrunning clutch

Technical field

The utility model design vehicle converter coupling technical field, is specifically related to the overrunning clutch in automobile converter coupling guide wheel.

Background technique

Overrunning clutch in automobile torque converter, allows the guide wheel connecting with wedge wheel only in a direction, to rotate freely.When guide wheel stress direction is identical with motor, can rotate freely, fluid torque converter output torque equals motor input torque; When guide wheel stress direction is contrary with motor rotation direction, guide wheel is fixed, and fluid torque converter increases output torque, has improved the efficiency of converter coupling simultaneously.Existing product is free wheeling sprag clutch, and complex structure, cost is higher and not wear-resistant, and working life is short.

Model utility content

The purpose of this utility model is the deficiency existing for prior art, provide a kind of simple in structure, easy to manufacture, with low cost, abrasion resistance properties is good and the automobile torque converter overrunning clutch of reliable operation.

For realizing above-mentioned model utility object, the technical solution adopted in the utility model is a kind of automobile torque converter overrunning clutch, comprises wedge wheel, roller, reed and fixed axle sleeve; Described wedge wheel is sleeved on fixed axle sleeve outside, at wedge wheel internal surface several eccentric arcs that distribute, after wedge wheel and fixed axle sleeve assemble, each eccentric arc forms a width of placing roller by the wide wedge shape space narrowing down gradually with corresponding fixed axle sleeve outer surface, reed one end is arranged on a wider side in wedge shape space, and the other end withstands on roller.Its effect is roller to be pressed to the narrower part of wedge shape space between Internal and external cycle, control the Engage and disengage of Internal and external cycle, when guide wheel is rotated counterclockwise, roller under the effect of reed compressive force to roller space a narrow side roll, until clamp motionlessly, play transmission twisting force, when guide wheel turns clockwise, roller is by wedge wheel with the wide side shifting of trend wedge shape space, and wedge wheel and fixed axle sleeve are in separated state.

Described wedge wheel is cam structure, is convenient to powder metallurgy processing in enormous quantities.

Described eccentric arc has eight, is evenly distributed on wedge wheel internal surface, and described wedge shape space also has eight.

Described wedge wheel outer surface and fixed axle sleeve outer surface are concentric circle.

It is 250Nm and 350Nm that this overrunning clutch coordinates Engine torque.As shown in Fig. 1-6, R ₁for the radius of fixed axle sleeve, be 28.225mm, R ₂for the internal surface radius of wedge wheel, be 34.225mm, R ₃for the outer surface radius of wedge wheel, be 42.668mm, R ₄for the radius of roller, be 3.969mm, R ₅for coordinating moment of torsion with motor, be the outer surface radius of the guide wheel that matches of 250Nm, R ₆for coordinating moment of torsion with motor, be the internal surface radius of the guide wheel that matches of 250Nm, R ₇for coordinating moment of torsion with motor, be the outer surface radius of the guide wheel that matches of 350Nm, R ₈for coordinating moment of torsion with motor, it is the internal surface radius of the guide wheel that matches of 350Nm, α is each roller and the tangent line of the eccentric arc intersection point of the internal surface of wedge wheel and this roller angle with the tangent line of the outer surface intersection point of corresponding fixed axle sleeve, size is 16 °, l is the length of roller, for 9.65mm, t is under reed installment state, and the length of the reed after compression, is 2.29mm.

In design, need the factor of checking to comprise the angle of wedge, contact stress, moment of torsion, tension tension force, spring force.Locking angle is shown in Fig. 2, and the angle of wedge must meet

μ is the static friction coefficient between roller and fixed axle sleeve and wedge wheel, and α is also large as far as possible simultaneously, and to guarantee torque transmission capacity, α is 16 ° here; Allowable contact stress [the σ of overrunning clutch material _h]≤4000MPa; Torque transmission capacity formula is $T_{\max }=\frac{1}{{184}^2}{\[{\mathrm{\σ}}_H\]}^2\mathrm{l\ρ}{R}_{1}n\tan \frac{\mathrm{\α}}{2}=420N\·m,$ [σ wherein _h] be the allowable contact stress of material, the length that l is roller, ρ is composite curve radius

anchor ear stress between roller and fixed axle sleeve $\mathrm{\&sigma;}=F_N\frac{n\cos \frac{\mathrm{\&alpha;}}{2}}{2\mathrm{\&pi;}{R}_2\mathrm{<figure-callout\; id="3"\; label="l\; R"\; filenames="HDA0000370654160000011.png"\; state="\{\{state\}\}">l</figure-callout>}}\frac{R_{}^{}}{}\frac{{}_3^2+{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA0000370654160000011.png"\; state="\{\{state\}\}">R</figure-callout>}}_2^2}{{\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="HDA0000370654160000011.png"\; state="\{\{state\}\}">R</figure-callout>}}_3^2-{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA0000370654160000011.png"\; state="\{\{state\}\}">R</figure-callout>}}_2^2}=260.8\mathrm{MPa}\&le;400\mathrm{MPa},$ Wherein $F_N=\frac{T_{\max }}{R_{1}n\tan \frac{\mathrm{\&alpha;}}{2}}=15642.5N;$ Under installment state, spring force during point of contact A, B contact is 0.5N～5N, gets 3N in this patent, and the free length of former reed is 11.43mm, and the spring length after installment state lower compression is 2.29mm.

Beneficial effect: the utility model is compared with existing free wheeling sprag clutch, its have advantages of simple in structure, easy to manufacture, with low cost, abrasion resistance properties is good and reliable operation.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the local enlarged diagram of the A of Fig. 1;

Fig. 3 is the structural representation of the utility model wedge wheel;

Fig. 4 is the structural representation of the utility model fixed axle sleeve;

Fig. 5 is embodiment 1 explanatory drawing;

Fig. 6 is embodiment 2 explanatory drawing.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, the present embodiment is implemented take technical solutions of the utility model under prerequisite, should understand these embodiments and only for the utility model is described, be not used in restriction scope of the present utility model.

Embodiment one: as Figure 1-Figure 5, a kind of automobile torque converter overrunning clutch, comprises wedge wheel 1, roller 2, reed 3 and fixed axle sleeve 4; Wherein wedge wheel 1 is sleeved on fixed axle sleeve 4 outsides, at wedge, take turns 1 internal surface and be uniformly distributed eight eccentric arcs 5, after wedge wheel 1 and fixed axle sleeve 4 assemble, each eccentric arc 5 forms a width of placing roller 2 by the wide wedge shape space narrowing down gradually 6, so wedge shape space 6 also has eight with corresponding fixed axle sleeve 4 outer surfaces.Reed 3 one end are arranged on a wider side in wedge shape space 6, and the other end withstands on roller 2.Wherein wedge wheel 1 is cam structure, and wedge is taken turns 1 outer surface and fixed axle sleeve 4 outer surfaces are concentric circle.

The present embodiment is the hydraulic torque converter for automatic transmission in 250Nm vehicle for maximum engine torque, concrete installation position is the guide wheel in fluid torque converter, its external diameter is 159mm, means of fixation is that the internal spline by fixed axle sleeve is connected with transmission oil pump back shaft, this back shaft maintains static and provides the moment of reaction, and the external tooth of taking turns by wedge and the endoporus of guide wheel are realized interference fit, while affording from the anticlockwise liquid moment of momentum in fluid torque converter circulate circle on guide vane, this moment passes to 8 rollers and fixed axle sleeve by the interference fit of wedge hole and guide wheel, due to fixed axle sleeve and housing affixed, and roller cannot enter the wedge shape space jointly being formed by the eccentric arc on wedge wheel internal diameter and the cylndrical surface on fixed axle sleeve external diameter, so now guide wheel also maintains static, and then realized flow direction change, increased the starting torque of automobile, when secondary speed is increased to after certain value, guide wheel is subject to the effect of the clockwise liquid moment of momentum, at this moment because 8 rollers can be to the wide side shifting of wedge shape space, so guide wheel can turn clockwise, the effect of reed is to be subject to when fluid power impacts break-in in time roller being pushed to point of contact A at guide wheel, B place, and the amount of floating of roller while reducing the clockwise High Rotation Speed of guide wheel, in this embodiment, the converter torque ratio scope of fluid torque converter is 1.5～2.5.Torque range on overrunning clutch is 125Nm～375Nm, and the moment of torsion that each roller bears is 15.6Nm～46.9Nm.

Embodiment two: the present embodiment structure is identical with embodiment one.

As shown in Figure 6, the present embodiment is the hydraulic torque converter for automatic transmission in 350Nm vehicle for maximum engine torque, concrete installation position is the guide wheel in fluid torque converter, its external diameter is 175.2mm, means of fixation is that the internal spline by fixed axle sleeve is connected with transmission oil pump back shaft, this back shaft maintains static and provides the moment of reaction, and the external tooth of taking turns by wedge and the endoporus of guide wheel are realized interference fit, while affording from the anticlockwise liquid moment of momentum in fluid torque converter circulate circle on guide vane, this moment passes to 8 rollers and fixed axle sleeve by the interference fit of wedge hole and guide wheel, due to fixed axle sleeve and housing affixed, and roller cannot enter the wedge shape space jointly being formed by the eccentric arc on wedge wheel internal diameter and the cylndrical surface on fixed axle sleeve external diameter, so now guide wheel also maintains static, and then realized flow direction change, increased the starting torque of automobile, when secondary speed is increased to after certain value, guide wheel is subject to the effect of the clockwise liquid moment of momentum, at this moment because 8 rollers can be to the wide side shifting of wedge shape space, so guide wheel can turn clockwise, the effect of reed is to be subject to when fluid power impacts break-in in time roller being pushed to point of contact A at guide wheel, B place, and the amount of floating of roller while reducing the clockwise High Rotation Speed of guide wheel, in this embodiment, the converter torque ratio scope of fluid torque converter is 1.5～2.5.Torque range on overrunning clutch is 175Nm～525Nm, and the moment of torsion that each roller bears is 21.9Nm～65.6Nm.

Claims (4)

1. an automobile torque converter overrunning clutch, is characterized in that: comprise wedge wheel (1), roller (2), reed (3) and fixed axle sleeve (4); Described wedge wheel (1) is sleeved on fixed axle sleeve (4) outside, at wedge wheel (1) internal surface several eccentric arcs (5) that distribute, after wedge wheel (1) and fixed axle sleeve (4) assemble, each eccentric arc (5) forms a width of placing roller (2) by the wide wedge shape space narrowing down gradually (6) with corresponding fixed axle sleeve (4) outer surface, reed (3) one end is arranged on a wider side in wedge shape space (6), and the other end withstands on roller (2).

2. a kind of automobile torque converter overrunning clutch according to claim 1, is characterized in that: described wedge wheel (1) is cam structure.

3. a kind of automobile torque converter overrunning clutch according to claim 1, is characterized in that: described eccentric arc (5) has eight, is evenly distributed on wedge wheel (1) internal surface, and described wedge shape space (6) also has eight.

4. a kind of automobile torque converter overrunning clutch according to claim 1, is characterized in that: described wedge wheel (1) outer surface and fixed axle sleeve (4) outer surface are concentric circle.

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