CN103438121A - One-way clutch for hydraulic torque converter of automobile - Google Patents

Abstract

The invention discloses a one-way clutch for a hydraulic torque converter of an automobile. The one-way clutch comprises a wedged wheel, rollers, leaf springs and a fixing shaft sleeve; the fixing shaft sleeve is sleeved with the wedged wheel, a plurality of eccentric circular arcs are distributed on the inner surface of the wedged wheel, after the wedged wheel is assembled with the fixing shaft sleeve, a wedged space used for containing one roller is formed by each eccentric circular arc and the corresponding portion of the outer surface of the fixing shaft sleeve, the width of each wedged space is gradually reduced, one end of each leaf spring is arranged at the wider side of one wedged space, and the other end of each leaf spring abuts against one roller. Compared with an existing wedge-type one-way clutch, the one-way clutch for the hydraulic torque converter of the automobile has the advantages of being simple in structure, easy to manufacture, low in cost, good in abrasion-resistant performance and reliable in operation.

Description

A kind of automobile torque converter overrunning clutch

Technical field

Design vehicle converter coupling technical field of the present invention, be specifically related to the overrunning clutch in automobile converter coupling guide wheel.

Background technique

Overrunning clutch in automobile torque converter, allow the guide wheel connected with the wedge wheel only to rotate freely in a direction.When the guide wheel stress direction is identical with motor, can rotate freely, the fluid torque converter output torque equals the motor input torque; When the guide wheel stress direction is contrary with the 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.

Summary of the invention

The objective of the invention is the deficiency existed 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 achieving the above object, the technical solution used in the present invention is a kind of automobile torque converter overrunning clutch, comprises wedge wheel, roller, reed and fixed axle sleeve; Described wedge wheel is sleeved on the 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 narrowed 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 the roller space a narrow side roll, until tighten motionlessly, play the transmission twisting force, when guide wheel turns clockwise, roller is by a wedge wheel side shifting wide with the 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 with motor, coordinating the outer surface radius that moment of torsion is the guide wheel that matches of 250Nm, R ₆for with motor, coordinating the internal surface radius that moment of torsion is the guide wheel that matches of 250Nm, R ₇for with motor, coordinating the outer surface radius that moment of torsion is the guide wheel that matches of 350Nm, R ₈for with motor, coordinating the internal surface radius that moment of torsion is 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 °, the length that l is roller, for 9.65mm, t is under the reed installment state, and the length of the reed after compression, be 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; The torque transmission capacity formula is $T_{\max }=\frac{1}{{184}^2}{\left[{\mathrm{\σ}}_H\right]}^2\mathrm{l\ρ}{R}_{1}n\tan \frac{\mathrm{\α}}{2}=420N\·m,$ [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 $\mathrm{\&sigma;}=F_N\frac{n\cos \frac{\mathrm{\&alpha;}}{2}}{2\mathrm{\&pi;}{R}_2\mathrm{<figure-callout\; id="3"\; label="l\; R"\; filenames="HDA0000370773700000011.png,HDA0000370773700000021.png"\; state="\{\{state\}\}">l</figure-callout>}}\frac{R_{}^{}}{}\frac{{}_3^2+{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA0000370773700000011.png"\; state="\{\{state\}\}">R</figure-callout>}}_2^2}{{\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="HDA0000370773700000011.png,HDA0000370773700000021.png"\; state="\{\{state\}\}">R</figure-callout>}}_3^2-{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA0000370773700000011.png"\; state="\{\{state\}\}">R</figure-callout>}}_2^2}=260.8\mathrm{MPa}\&le;400\mathrm{MPa},$ 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 the installment state lower compression is 2.29mm.

Beneficial effect: the present invention compares 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.

The accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

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

The structural representation that Fig. 3 is wedge wheel of the present invention;

The structural representation that Fig. 4 is fixed axle sleeve of the present invention;

The explanatory drawing that Fig. 5 is embodiment 1;

The explanatory drawing that Fig. 6 is embodiment 2.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, the present embodiment is implemented take technical solution of the present invention under prerequisite, should understand these embodiments and only for the present invention is described, is not used in and limits the scope of the invention.

Embodiment one: as Figure 1-Figure 5, a kind of automobile torque converter overrunning clutch, comprise wedge wheel 1, roller 2, reed 3 and fixed axle sleeve 4; Wherein wedge wheel 1 is sleeved on fixed axle sleeve 4 outsides, take turns 1 internal surface at wedge 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 narrowed down gradually 6, so wedge shape space 6 also has eight with corresponding fixed axle sleeve 4 outer surfaces.Reed 3 one ends 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 on the 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 the 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 the 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 can't enter the wedge shape space jointly formed by the eccentric arc on wedge wheel internal diameter and the cylndrical surface on the fixed axle sleeve external diameter, so now guide wheel also maintains static, and then realized the flow direction change, increased the starting torque of automobile, after secondary speed is increased to certain value, guide wheel is subject to the effect of the clockwise liquid moment of momentum, at this moment due to 8 rollers can be wide to wedge shape space a side shifting, so guide wheel can turn clockwise, the effect of reed is to be subject to when fluid power impacts break-in pushing point of contact A to roller in time at guide wheel, the 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 on the 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 the 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 the 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 can't enter the wedge shape space jointly formed by the eccentric arc on wedge wheel internal diameter and the cylndrical surface on the fixed axle sleeve external diameter, so now guide wheel also maintains static, and then realized the flow direction change, increased the starting torque of automobile, after secondary speed is increased to certain value, guide wheel is subject to the effect of the clockwise liquid moment of momentum, at this moment due to 8 rollers can be wide to wedge shape space a side shifting, so guide wheel can turn clockwise, the effect of reed is to be subject to when fluid power impacts break-in pushing point of contact A to roller in time at guide wheel, the 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 narrowed down gradually (6) with corresponding fixed axle sleeve (4) outer surface, reed (3) one ends are 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, it is characterized in that: described wedge wheel (1) is cam structure.

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

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