CN2224396Y

CN2224396Y - Involute cylindrical-gear divided-arc thooth thick measuring device

Info

Publication number: CN2224396Y
Application number: CN 94238087
Authority: CN
Inventors: 刘曙军
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-26
Filing date: 1994-08-26
Publication date: 1996-04-10
Anticipated expiration: 2004-08-26

Abstract

The utility model discloses a measuring device for involute cylinder gear indexing arc tooth thickness. A measuring head (6) which can freely rotate is arranged in a jacket (2) and is propped up by a compression spring (5) by using a screw (4), the middle part of the jacket (2) is provided with a notch (7), a notch (8) is opened through the other side of the jacket (2), the jacket (2) is fastened on the end of the selected measuring instrument measuring rod (3) by a screw (1), and the end face of the end is tightly pasted with the end face of the measuring head (6). The measuring device can be arranged on the measuring rods of the measuring instruments which have two parallel coaxial measuring surfaces and can also be arranged on the measuring rods of single-shaft moving measuring instruments. The utility model can also be arranged on gear processing machine tools to realize the automatic measurement of processing.

Description

Involute urve garden stud wheel graduated arc transverse tooth thickness measurement mechanism

The utility model is a kind of involute cylindrical gear graduated arc transverse tooth thickness measurement mechanism.

Usually the direct measurement of involute cylindrical gear graduated arc transverse tooth thickness is difficult realizes.In current measuring methods, generally all be to measure the measurement that substitutes the graduated arc transverse tooth thickness with reference circle chordal thickness, chordal thickness, base tangent length and garden rod.Because reference circle chordal thickness, constant chordal tooth thickness measurement need can bring positioning error with the point circle location; Common normal length measurement is actually the normal direction of having striden n tooth and measures, and wherein can bring the influence of accumulative pitch error into, can not accurately measure, and be subjected to the restriction of helix angle, the facewidth; The pole measuring accuracy is higher, but since the reduction formula complexity, each modulus, and even Tong modification coefficient does not all need the pole of respective diameters, applies so limited it.

It is simple that the purpose of this utility model provides a kind of measuring method, the measuring accuracy height, and versatility is good, is convenient to the graduated arc transverse tooth thickness measurement mechanism of operating and applying.

The utility model is that a gauge head that can rotate freely 6 (" V " structure) is installed in the chuck 2, stage clip 5 is fixed on a side of chuck 2 with screw 4, make stage clip 5 produce an axial force and withstand gauge head 6, play the block effect simultaneously, gauge head 6 can not be deviate from from chuck 2.The locking position of the opposite side by chuck 2 has notch 8 again, with screw 1 chuck 2 is locked on the termination of selected measuring appliance measuring staff 3, and the end face of its measuring staff termination and the end face of gauge head 6 are adjacent to.Above-mentioned notch 8 is the locking surpluses that are used for increasing screw 1.

The utility model is also at the middle part of chuck 2, perpendicular to the trepanning axis direction slightly angle of tilt axis vertical plane open a

notch

7,2 of chucks are locked on the selected measuring appliance measuring staff 3, and do not lock gauge head 6, thereby gauge head 6 is rotated freely.

Below in conjunction with accompanying drawing the utility model is elaborated:

Fig. 1 has the front elevational schematic of flute profile gauge head for this usefulness is novel.

Fig. 2 is the sectional view of Fig. 1 along the I-I line.

Fig. 3 is the instrumentation plan that the utlity model has the flute profile gauge head.

Fig. 4 is the instrumentation plan that the utlity model has piece shape gauge head.

Referring to Fig. 1, described selected measuring appliance measuring staff 3, divide chi or horizontal metroscope etc. to have two horizontal survey faces and coaxial measuring staff as light face stalk, only need be the chuck 2 that stage clip 5 and flute profile gauge head 6 are housed, be locked at by screw 1 on the termination of above-mentioned measuring staff 3, make its measuring staff end face be adjacent to the end face of gauge head 6, just constitute the utility model.

Now according to Fig. 3, brief description measuring principle of the present utility model.Be easy analysis, the situation the when state in the time of can contacting flute profile gauge head 6 with tested gear 9 is regarded the engagement of wheel and rack groove as.Know " no matter how many tooth bars is with respect to moving radially of gear; engaging angle equals pressure angle of graduated circle forever " by wheel and rack engagement characteristics, no matter whether displacement of gear just, the intersection point one of left and right two action line of gear fixes on the gear compound graduation circle, engaging angle equals pressure angle, equals tooth bar thread form half-angle.In addition, because the gear of a pair of tight engagement, the two-wheeled pitch of teeth necessarily equates, so the thickness on pitch circle of a gear must equal another pitch circle groove facewidth, and wheel and rack is when meshing, and the pitch circle of gear is exactly a reference circle.So in Fig. 3, the tooth bar groove width ab of node place equals gear compound graduation circular thickness cd.

Aeo can get ae=oetg α by Fig. 1 intermediate cam shape,

And 2ae=ab=cd=s,

So gear compound graduation circular thickness S=2oetg α.(A)

During measurement, be that the diameter direction at tested gear 9 disposes a pair of gauge head unit, i.e. two " V " shape flute profile gauge heads 6, so the measured value between the two flute profile gauge head end faces:

M＝df+2oe+Lc1+Lc2，

2oe+M-df-Lc1-Lc2 substitution (A)

S＝(M-df-Lc1-Lc2)tgα。(B)

Following formula (B) is the utility model groove---when the groove structure is measured the even number tooth, and the measure equation of graduated arc transverse tooth thickness S.

M-measured value in the formula, the distance between two " V " shape gauge head, 6 end faces;

Tested gear 7 reference diameters of df-;

α-pressure angle of graduated circle, " V " shape gauge head thread form half-angle;

Lc1, Lc2-flute profile gauge head 6 " V " shape hand-deliver point arrive the distance of end face.

If when measuring the odd number tooth, above-mentioned two flute profile gauge heads 6 one of them, change a piece shape gauge head 10 into.

In Fig. 4, in the time of in like manner can drawing groove-block structure gauge head and measure the odd number tooth, the measure equation of graduated arc transverse tooth thickness:

Sa＝(M-df-Lc-Lk)tgα+πm/2 (C)

M, df in the formula, α, Lc are identical with (B);

Sk-piece shape gauge head 10 " V " shape hand-deliver point is to the distance of end face;

The modulus of the tested gear 11 of m-.

In like manner, also can change gauge head of the present utility model into piece-block structure, the measure equation of its graduated arc transverse tooth thickness:

Sb＝(M-df-Lk1-Lk2)tgα+πm (D)

Symbol is the same in the formula.

Because wheel and rack meshes general overlap coefficient 〉=1,, also can survey the odd number tooth, and formula is constant so under the situation of not considering tooth error, above-mentionedly arbitraryly can survey the even number tooth to the gauge head structure.

In measuring process, better for making gauge head with contacting of tested gear, also can do " V " block structure shape gauge head coning, also can constitute the utility model.

The utility model can also Gear axis be a benchmark, is contained on the measuring appliance measuring staff that single shaft moves with single gauge head (flute profile or piece shape), as is contained on gear cutting machine, the gear detecting instrument, promptly constitutes the transverse tooth thickness pick-up unit.

When adopting the utility model to measure, only need read the M value, just the numerical value that can calculate corresponding graduated arc transverse tooth thickness according to aforementioned calculation formula (A), (B), (C), (D).

The utlity model has following advantage:

1. computing formula is simple, and irrelevant with modification coefficient, as long as measure the M value, just can calculate The actual graduated arc transverse tooth thickness consistent with standard.

2. versatility is good. Formula is used for straight-tooth and helical teeth, is not considering what profile error affected In the situation, any two gauge heads of double-measuring head structure same specification had both been surveyed the odd number tooth, also surveyed the even number tooth, Formula is constant. Simultaneously, a kind of gauge head of specification can also be surveyed multiple modulus, multiple modification coefficient Gear.

3. the utility model clamping is convenient, need not independent check and correction, after gauge head is pulled down, and also shadow not Ring former measuring appliance performance.

4. gauge head is configured in the automatic measurement that can realize processing on the gear cutting machine, and its measurement state is consistent with machining state, can instruct the processing feed intuitively, and measures the restriction that is not subjected to the facewidth, helix angle.

5. the measuring accuracy height does not need with point circle location, no positioning error.Owing to substitute tangential transverse tooth thickness measurement with radial measurement, its graduated arc transverse tooth thickness deviate is less than tangential transverse tooth thickness deviate again.The advantages such as accumulative pitch error that also have or not common normal length measurement to bring.

Claims

1. involute cylindrical gear graduated arc transverse tooth thickness measurement mechanism, it is characterized in that a gauge head (6) that can rotate " V " structure freely is installed in the chuck (2), stage clip (5) is fixed on a side of chuck (2) with screw (4), make stage clip (5) withstand gauge head (6), have a notch (7) at the middle part of chuck (2), the locking position of the opposite side by chuck (2) has notch (8) again, with screw (1) chuck (2) is locked on the termination of selected measuring appliance measuring staff (3), and the end face of its termination and the end face of gauge head (6) are adjacent to.

2. measurement mechanism as claimed in claim 1 is characterized in that described gauge head (6) can make flute profile, piece shape or taper shape.