CN101614274A - Detachable gear wheel - Google Patents

Abstract

The invention provides a kind of detachable gear wheel, belong to technical field of transmission.Described detachable gear wheel is characterized in that comprising the wheel hub that is provided with installation axle hole, and the gear ring outside wheel hub spliced, and the end face junction of described wheel hub, gear ring is fixedly connected by the straight end-face key that is arranged at wheel hub.The present invention changes gear into inserted coil structures, gear ring connects with straight end-face key with wheel hub to be fixed, and straight end-face key is fixed in wheel hub, both solved that heat treatment cycle is long, the problem of gear ring hardness inequality, basic again solution the problem of the gear ring stressed back distortion that causes because of junction of the edges of two sheets of paper screw, have simple in structure, easy to process, not yielding, long service life, lower-cost advantage.

Description

Detachable gear wheel

Technical field

The present invention relates to technical field of transmission, be specifically related to a kind of detachable gear wheel.

Background technique

Gear is widely used in the transmission system of various machinery as a kind of transmission part of maturation.The gear structure of people's employing at present is generally integrated type, it has easy processing, characteristics that precision is high, but gear adopts high-quality low alloy steel to make, need obtain characteristics such as certain shock resistance, wear-resistant and toughness through the heat treatment carburizing and quenching, and according to the performance requirement of gear, having relatively high expectations of the gear ring and the flank of tooth only adopts overall structure not only to waste the high-quality steel, returns Gear Processing and heat treatment brings inconvenience.Therefore my company produces gear bigger in the retarder in the past, much all is to adopt inserted coil structures, and promptly gear is made gear ring 1 (Fig. 3), in wheel hub 2 and axle are arranged, adopt rivet 5 to fix between wheel hub 2 and the gear ring 1.But find that through practice use rivet 5 fixed gear rings 1 and wheel hub 2, gear ring 2 is before heat treatment; the cement protection layer will be smeared by 5 places at rivet; or after the carburizing, in the position of boring rivet 5 carburized case is machined away before quenching, in order to avoid can not process rivet 5 after quenching.Jia Gong technology like this, heat treatment cycle is long, man-hour many, expense height; And it is very big in the difference in hardness of the quenching hardness at rivet 5 places and gear ring 1 its elsewhere; Fix gear ring 5 with rivet 5, gear is when work, and rivet 5 can be given 1 one extruding forces that outwards rise of gear ring, easily makes gear ring 1 distortion.

Summary of the invention

At the above-mentioned problems in the prior art, the object of the invention is to provide a kind of simple in structure, easy to process, not yielding, long service life, lower-cost detachable gear wheel.

Described detachable gear wheel is characterized in that comprising the wheel hub that is provided with installation axle hole, and the gear ring outside wheel hub spliced, and the end face junction of described wheel hub, gear ring is fixedly connected by the straight end-face key that is arranged at wheel hub.

Described detachable gear wheel is characterized in that place, wheel hub both sides of the edge is provided with one group of circumference uniform distribution wheel hub keyway respectively, and described straight end-face key is fixedly connected in the wheel hub keyway by the fastening piece that is provided with, the inboard corresponding keyway recess that is equipped with of gear ring.

Described detachable gear wheel is characterized in that the interlaced uniform setting of wheel hub keyway that the wheel hub both sides are provided with respectively.

Described detachable gear wheel is characterized in that straight end-face key is fixed in the wheel hub keyway by the fastening screw trip bolt that is provided with.

Described detachable gear wheel is characterized in that the fixedly connected back of straight end-face key outer surface is concordant with the side of wheel hub, gear ring.

Described detachable gear wheel is characterized in that the wheel hub keyway that the wheel hub both sides are provided with respectively is 6.

The present invention changes gear into inserted coil structures, gear ring connects with straight end-face key with wheel hub to be fixed, and straight end-face key is fixed in wheel hub, has both solved that heat treatment cycle is long, the problem of gear ring hardness inequality, basic again solution the problem of the gear ring stressed back distortion that causes because of junction of the edges of two sheets of paper screw.

Description of drawings

Fig. 1 is the structural representation of this detachable gear wheel;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the structural representation of common detachable gear wheel.

Among the figure, 1, gear ring; 2, wheel hub; 2a, wheel hub keyway; 3, straight end-face key; 4, fastening screw trip bolt; 5, rivet.

Embodiment

The invention will be further described below in conjunction with Figure of description:

As shown in Figure 1 and Figure 2, this detachable gear wheel, comprise the wheel hub 2 that is provided with installation axle hole, and the gear ring 1 outside wheel hub 2 spliced, place, wheel hub 2 both sides of the edge is provided with one group of circumference uniform distribution wheel hub keyway 2a respectively, the gear ring 1 inboard corresponding keyway recess that is equipped with, the interior end face junction that straight end-face key 3 is fixedly connected on above-mentioned wheel hub 2, gear ring 1 by the fastening screw trip bolt 4 that is provided with of wheel hub keyway 2a.In this product, wheel hub, the wheel hub keyway 2a that 2 both sides are provided with respectively is 6, and the interlaced uniform setting of wheel hub keyway 2a of both sides.Straight end-face key 3 fixedly connected back outer surfaces are concordant with the side of wheel hub 2, gear ring 1.

Among the present invention, novelty is used straight end-face key 3 fixedly connected wheel hubs 2, gear ring 1, and straight end-face key 3 is fixed on the edge of wheel hub 2, and as Fig. 2, hexagonal fastening screw trip bolt 4 is fixed on straight end-face key 3 among the wheel hub keyway 2a firmly in adopting.Fastening screw trip bolt 4 has promptly played the fixedly effect of straight end-face key 3, has played again because the axial force that helical gear causes, prevents that straight end-face key 3 from go here and there the effect of moving vertically.

And prior art adopts rivet 5 to fix between wheel hub 2 and the gear ring 1, as Fig. 3.When gear ring 1 is heat-treated, also to do independent processing to rivet 5 places, processing time consuming, the expense height, and when working gear, 1 one extruding forces that outwards rise of gear ring are given in rivet meeting 5, easily make gear ring 1 distortion, cause the working life of gear lower.Among the present invention, use the connection of straight end-face key 3 fixed gear rings 1 and wheel hub 2, not only saved above-mentioned independent heat treatment step, reduce process time, reduce cost the joint; And straight end-face key 3 makes 1 stressed of the gear ring tangential position at the gear ring circle, do not have the component gear ring that rises, and effectively solved the problem of gear ring 1 distortion.Make detachable gear wheel of the present invention have easy to process, cost is lower, the advantage of not yielding, long service life.

Below, be example with my the polyhedron 16# of company speed reducer output gear, the stressed and intensity of using the fixing inserted circle of straight end-face key is calculated:

One. known conditions

1. import maximum motor power 396KW

2. motor input hypothesis rotating speed 1500r/min

3. the speed reducer velocity ratio is 50: 1

4. gear compound graduation circular diameter d2=687.6mm

5. inserted wheel rim internal diameter φ 590mm

6. gear helical angle β=13 °

Two. the output speed of retarder is:

$n=\frac{1500r/\min }{50}=30r/\min$

Three. the retarder output torque is:

$\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="A2009101013140010H1.png,A2009101013140011H1.png"\; state="\{\{state\}\}">T</figure-callout>}1=\frac{9550\&times;P}{n}=\frac{9550\&times;396}{30}N\&CenterDot;m=126060N\&CenterDot;m$

In the formula: P-input power (KW)

N-output speed (r/min)

Four. the tangential force that actuation gear rotates:

$\mathrm{<figure-callout\; id="1"\; label="F"\; filenames="A2009101013140010H1.png,A2009101013140011H1.png"\; state="\{\{state\}\}">F</figure-callout>}1=\frac{2000\&times;T_1}{{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="A2009101013140010H1.png,A2009101013140011H1.png"\; state="\{\{state\}\}">d</figure-callout>}}_2}=\frac{2000\&times;126060}{687.6}N=366666.6N$

In the formula: d2-gear compound graduation circular diameter (mm)

T1-retarder output torque (N.m)

Five. the axial force that produces because of gear helical angle:

Fx＝F1×tanβ＝366666.6×0.231N＝84651.6N

Six. the crushing strength of straight end-face key:

The inserted circle gear of 16# machine is designed to two end faces and amounts to 12 straight end-face keys, 6 straight end-face keys of each end face, and both ends of the surface are in staggered distribution.

1. key is wide by 45

2. thick 25

3. the contact height of key and wheel hub is 12mm

4. pushing working strength is σ pp=[180N] (key after heat treatment, hardness is 21～23HRC)

$\mathrm{\&sigma;p}=\frac{2T}{\mathrm{DKL}}\&le;\mathrm{\&sigma;pp}$

$=\frac{2\&times;126060\&times;1000}{590\&times;12\&times;25\&times;(12\&divide;2\&times;1.5)}N=158.26N\&le;\mathrm{\&sigma;pp}$

In the formula: the inserted wheel rim internal diameter of D-(mm)

The contact height of K-key and wheel hub (mm)

The active length of L-key (mm)

The extruding allowable stress (MPa) of σ pp-key

Seven. calculate the straight end-face key shearing strength:

Shearing strength allowable is τ p=[60N]

$\mathrm{\&tau;}=\frac{2T}{\mathrm{DbL}}\&le;\mathrm{\&tau;p}$

$=\frac{2\&times;126060\&times;1000}{590\&times;45\&times;25\&times;(12\&divide;2\&times;1.5)}N=42.2N\&le;\mathrm{\&tau;p}$

In the formula: the width of b-key (mm)

The shearing stress allowable (MPa) of τ p-key connecting

Eight. calculate the diameter d path of straight end-face key with screw

The gear two sides amounts to 12 straight end-face keys (6 of single faces)

1. calculate 6 total pulling forces that screw bore:

P∑＝(Ko+KC)P＝(2+0.25)×84651.6N＝190466.1N

In the formula: Ko-pretension coefficient, the 5-1-54 that tables look-up (" mechanical design handbook " Chemical Industry Press) gets Ko=2

KC-screw relative stiffness coefficient, 5-1-55 tables look-up; Get KC=0.25

2. calculate the allowable tensile stress σ lp (MPa) of screw:

$\mathrm{\&sigma;lp}=\frac{\mathrm{\&sigma;s}}{1.2~1.7}=\frac{580}{1.5}N=386.6N$

In the formula: the yield limit (MPa) of the σ s-material 5-1-63 that tables look-up, the assurance load (GB/T3098.1-2000) of screw is chosen 8.8 grades of screw M14 * 1.5, and Sp=72500/125=580 establishes Sp ≈ σ s

3. calculate screw diameter d path

In the formula: 6-numeral 6 is that 6 screws are subjected to pulling force simultaneously.

Getting screw is M14 * 1.5.

Nine. check screw tensile strength σ t

${\mathrm{\&sigma;}}_1=\frac{1.3\&times;P_{\mathrm{\&Sigma;}}}{6\&times;A_S}=\frac{1.3\&times;190466}{6\&times;\frac{3.14\&times;{\left(12.37\right)}^2}{4}}N=343.558N$

343N＜386.6N is that σ l＜σ lp check is qualified

Ten. calculate the shear strength τ of straight end-face key screw via hole step

It is locking that screw is used the heavy-duty spring packing ring, and the spring washer external diameter of M14 is d=23.8mm choosing [τ]=[50N/mm2]

1. calculate the axial force of a screw carrying:

2. check the shearing strength of screw via hole:

The safety coefficient that we use in above calculating all is very high and very reliable.For example Sp is the reliable load of regulation among the Sp ≈ σ s, and we calculate it in calculating as σ s.

Claims (6)

1. detachable gear wheel is characterized in that comprising the wheel hub (2) that is provided with installation axle hole, and the gear ring (1) outside wheel hub (2) spliced, and the end face junction of described wheel hub (2), gear ring (1) is fixedly connected by the straight end-face key (3) that is arranged at wheel hub (2).

2. as claims 1 described detachable gear wheel, it is characterized in that place, wheel hub (2) both sides of the edge is provided with one group of circumference uniform distribution wheel hub keyway (2a) respectively, described straight end-face key (3) is fixedly connected in the wheel hub keyway (2a) by the fastening piece that is provided with, the inboard corresponding keyway recess that is equipped with of gear ring (1).

3. as claims 2 described detachable gear wheels, it is characterized in that the interlaced uniform setting of wheel hub keyway (2a) that wheel hub (2) both sides are provided with respectively.

4. as claims 2 described detachable gear wheels, it is characterized in that straight end-face key (3) is fixed in the wheel hub keyway (2a) by the fastening screw trip bolt (4) that is provided with.

5. as claims 2 described detachable gear wheels, it is characterized in that the fixedly connected back of straight end-face key (3) outer surface is concordant with the side of wheel hub (2), gear ring (1).

6. as claims 3 described detachable gear wheels, it is characterized in that the wheel hub keyway (2a) that wheel hub (2) both sides are provided with respectively is 6.

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