JPH0654205B2 - Device and method for measuring tooth thickness in gear machining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tooth thickness in gear machining for measuring a tooth thickness by a simple method at the time of gear gear cutting and setting a required depth of cut. The present invention relates to a measuring method and device.

[Conventional technology]

Generally, in gear cutting of a gear by a hobbing machine and a gear shaper, it is necessary to measure the tooth thickness at the time of exchanging a cutting tool and set a required cutting amount by a new cutting tool. Conventionally, as a method of measuring the tooth thickness, a method of measuring an overball diameter and a method of measuring a bristle tooth thickness have been adopted.

As shown in FIG. 4, the method of measuring the overball diameter is such that pins or balls 1 and 1 are inserted and abutted between two teeth facing the axis O of the gear, and the two are opposed to each other. after measuring the over ball diameter M _e between the pin or ball 1,1, it is to convert the tooth thickness T _a from the value of M _e.
Further, the method of measuring the straddle tooth thickness is such that the straddle tooth thickness T is crossed over a plurality of teeth in a direction perpendicular to the tooth axis by a micrometer.
After measuring the _b, it is to convert the tooth thickness T _a from the value of T _b.

[Problems to be solved by the invention]

Among the above-mentioned conventional measuring methods, in the method of measuring the overball diameter, holding of the ball or pin is unstable when the gear is fixed to the jig, and the micrometer is a cutting tool, a jig and an accessory device. Since it interferes with the measurement, there is a problem that the measurement is difficult and the measurement is impossible with a large gear having a large helix angle. In addition, in the method of measuring the stride tooth thickness, it is possible to measure when the teeth are parallel to the axial direction of the gear, but when the teeth are inclined with the axial direction of the gear like a helical gear. , Especially for relatively large gears with small tooth width and large twist angle,
Since the micrometer abuts the tooth surface at a right angle, it may not be possible to abut a plurality of teeth, which causes a problem that measurement becomes impossible. Furthermore, in any of the above conventional measuring methods, there is a problem that the measurement of the tooth thickness in a state where the gear is fixed to the jig cannot be measured due to the interference between the jig and the measuring device and the tooth width of the gear. It was happening.

An object of the present invention is to eliminate the above-mentioned problems, and it is possible to easily measure a tooth thickness in a state where a gear is fixed to a processing device, and a tooth width is small and a twist angle is large. The purpose of the present invention is to make it possible to measure the tooth thickness even in a large helical gear.

[Means for solving problems]

Therefore, the tooth thickness measuring device of the present invention is slidably disposed on the main body 2 having the fixed ball 5 that abuts between the adjacent teeth 9 of the gear, and on the tooth bottom side of the fixed ball 5 of the main body 2. The sliding ball 6 and the sliding ball 7 provided at the tip of the sliding shaft 6 and having a smaller diameter than the fixed ball 5, and the position where the fixed ball 5 abuts between the teeth 9, 9, The tooth | gear 9, and the detection mechanism which detects the distance to the position which contacted 9 are provided.

In addition, the tooth thickness measuring method of the present invention, the adjacent teeth 9 of the gear,
The large-diameter spherical surface is brought into contact with the tooth 9, and the small-diameter spherical surface having a diameter smaller than that of the large-diameter spherical surface is brought into contact with the teeth 9 and 9, and the large-diameter spherical surface between the teeth 9 and 9 is brought into contact. It is characterized in that the distance from the position to the position where the small-diameter spherical surface comes into contact is detected, and the change in the distance before machining of the gear and the distance after machining is converted into tooth thickness. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings in order to facilitate understanding of the present invention, and the configurations of the present invention are not limited thereby.

[Operation and effect of the invention]

In the present invention, by detecting the amount of movement of the sliding ball, the tooth thickness can be easily measured while the gear is fixed to the processing device, and the tooth width is small and the twist angle is relatively large. It is possible to measure the tooth thickness of a helical gear. Therefore, reprocessing can be performed immediately and the number of defective products can be reduced. Also, the pressure angle of the contact point between two balls with different diameters and teeth is different,
Since the difference in the overball diameter of each ball is detected by this difference, it is not necessary to directly measure the overball diameter, and the tooth thickness is measured with two balls, so the measurement accuracy can be increased.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 is a side view showing an embodiment of a tooth thickness measuring device according to the present invention, FIG. 2 is a diagram for explaining a measuring principle by the tooth thickness measuring device of FIG. 1, and FIG. 3 is a measured value and a notch. It is a figure which shows the relationship with quantity. In the figure, 1 is a tooth thickness measuring device, 2 is a main body,
3 is a dial gauge, 5 is a fixed ball that abuts between adjacent teeth 9 of the gear, 6 is a sliding shaft slidably arranged on the tooth bottom side of the fixed ball 5, and 7 is a sliding shaft 6. 3 shows a sliding ball provided at the tip of the slider and having a smaller diameter than the fixed ball 5.

In FIG. 1, the tooth thickness measuring device 1 has a 1
A dial gauge 3 having a scale of 100 mm is provided, a fixed ball 5 is provided at a lower portion of the main body 2, and a sliding shaft 6 is slidably arranged inside the main body 2 by a spring (not shown). Is urged in a direction projecting from 2, and
A sliding ball 7 is integrally provided at one end of the sliding shaft 6. When measuring the tooth thickness, the sliding ball 7 of the tooth thickness measuring device 1 is inserted between the teeth 9 and 9 of the gear, and the fixed ball 5 and the sliding ball 7 are brought into contact with the teeth 9 and 9 of the gear. When
The amount of movement of the sliding shaft 6 is magnified 10 times by a magnifying mechanism (not shown) in the main body 2, detected by the dial gauge 3, and the distance between the center of the fixed ball portion 5 and the center of the sliding ball 7 is detected. Is what is measured.

Next, the principle of measurement by the above-mentioned measuring device will be described with reference to FIGS. 4 and 2. The value of the overball diameter changes depending on the diameter of the ball used, and the difference in the pressure angle between the contact point of the ball and the tooth causes The degree of change of the overball diameter with respect to the change is different. In FIG. 6, the overball diameter is M
_e, diameter _{D b} of the base circle, the pressure angle of the ball center alpha, and the radius of the ball and _{d, M e = D b /} COS α + 2d _{However, Inv.α = T a / D b} + Inv.α a + d / _R b -π / N where, Inv.α = tan α-α, T a is the tooth thickness, _{D p} is the pitch circle diameter, pressure angle alpha _a is the direction perpendicular to the axis, _{R b} is the radius of the base circle , N indicates the number of teeth.

Therefore, as shown in FIG. 2B, different ball diameters d
_When a ball having a diameter of ₁ or d ₂ is used, the difference ΔM _e1 in overball diameter due to the difference in ball diameter is ΔM _e1 = M _e1 −M _e1 ′ = D _b / COS α ₁ −D _b / COS α
₂ becomes a _{+2 · (d 1 -d 2)} .

Is detected as alpha ₁ and alpha ₂ and d ₁ and d the difference between the ₂ .DELTA.M _e1 the above, .DELTA.M _e1 even without measuring the over ball diameter directly becomes measurable.

On the other hand, the difference .DELTA.M _e1 of the over ball diameter from the above equation, in order to change the tooth thickness T _a, by measuring the degree of change at the time of gear cutting, i.e. over balls was measured when the second view (b) The difference in diameter ΔM _e1 and the difference in overball diameter Δ measured in the state shown in FIG.
If the difference ΔM from M _e2 is measured, the value can be converted into the tooth thickness or the cutting depth. Specifically, as shown in FIG. 3, the relationship between ΔM = ΔM _e2 −ΔM _e1 and the cut amount is graphed in advance, and the cut amount is obtained from the measured ΔM. Therefore, if ΔM _e1 is measured first, the difference ΔM between overball diameters with different ball diameters
_The depth of cut by the hobbing machine can be set only by measuring _e2 .

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a tooth thickness measuring device according to the present invention, FIG. 2 is a diagram for explaining a measuring principle by the tooth thickness measuring device of FIG. 1, and FIG. 3 is a measured value and a notch. FIG. 4 is a diagram showing the relationship with the amount, and FIG. 4 is a diagram for explaining a conventional tooth thickness measuring method. 1 ... Tooth thickness measuring device, 2 ... Main body, 3 ... Dial gauge, 5 ... Fixed ball, 6 ... Sliding shaft, 7 ... Sliding ball, 9 ... Tooth

Claims (2)

[Claims] 1. A main body having a fixed ball that abuts between adjacent teeth of a gear, a sliding shaft slidably disposed on the tooth bottom side of the fixed ball of the main body, and a tip of the sliding shaft. And a detection mechanism for detecting a distance from a position where the fixed ball abuts between the teeth and a position where the sliding ball abuts between the teeth, and a sliding ball having a smaller diameter than the fixed ball. A tooth thickness measuring device in gear machining, comprising: 2. A large-diameter spherical surface is abutted between adjacent teeth of a gear, a small-diameter spherical surface having a smaller diameter than the large-diameter spherical surface is abutted between the teeth, and the large-diameter spherical surface between the teeth is formed. In gear machining, the distance from the position where the spherical surface abuts to the position where the small diameter spherical surface abuts is detected, and the change in the distance before and after the machining of the gear is converted to tooth thickness. Tooth thickness measurement method.