JPH0337701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention measures the fluctuation of the center position of the gear to be measured and the master gear with respect to rotation by meshing two toothed gears, compares this with the fixed position, and then determines the quality of the gear to be measured. The present invention relates to an automatic gear sorting machine that makes instantaneous judgments, and in particular to one that can completely inspect dents.

Conventionally, gears, especially gears used in automobile transmissions, have been required to have durability and noise prevention. It is effective to control pitch mesh error and (4) over ball dia (backlash), and for this purpose, we improved the two-tooth surface mesh tester and compared the measured values and set values. An automatic gear sorting machine was used to determine the quality of the gear to be measured. In other words, the one shown in Fig. 1 is a conventional gear automatic sorting machine, in which a gear to be measured B is fitted onto a shaft fixed on a movable support C, and a master gear A and a separated gear are separated with high precision. When the master gear A is rotated, the measured gear B is placed on the support base C, which moves without resistance on the line connecting the centers of both gears A and B with respect to the master gear A. Since it is attached to the shaft,
The above error of the gear to be measured B can be detected by the measurement unit D as a change in the distance between the centers of both gears. Every time the timer mechanism generates sampling pulses at regular intervals and one timing pulse is generated for each tooth of the master gear, the electric micrometer value indicating the amount of fluctuation is input into the measuring device, and the value of the electric micrometer indicating the amount of variation is input into the measuring device. After measuring the maximum and minimum values and performing the necessary calculations on them through a low-pass filter and a high-pass filter, the results are compared with the set values to detect gear dents, tooth groove runout, 1-pitch meshing error, bumps, etc. It is used to judge whether the quality is good or bad.
E in FIG. 1 is a recording section, and F is a judgment section which organizes the signals, compares them with a set value (tolerable value), and issues a judgment, both of which are well known.
In this case, the torsion angles of the gear to be measured and the master gear are the same.

However, the conventional gear automatic sorting machine described above has the disadvantage that it cannot detect dents in the non-contact parts when the master gear and the gear to be measured mesh. Because carburizing and quenching or carbonitriding is performed as a heat treatment, sag (the pressure angle tends to increase) occurs at both ends in the lead direction (tooth width direction of the tooth profile) after the heat treatment, resulting in non-contact areas during meshing. However, dents are likely to occur in this area, that is, the tip and both ends (particularly the sharp edge), and therefore, the detection of dents is also insufficient. The dents in this part cannot be detected even by a gear speeder (a device that meshes gears at a designed distance between the shafts and judges the meshing sound by hearing), so they are assembled as a transmission, and torque is applied. Since it is something that can be detected for the first time, detection of dents is necessary at the time of sorting.

The purpose of this invention is to improve the drawbacks of the conventional automatic gear sorting machine described above.
In order to make contact even when tooth flanks engage, the torsion angle of the master gear is set to be slightly smaller than the torsion angle of the gear to be measured, and the master gear is set at a slightly smaller angle than the torsion angle of the gear to be measured. This is a gear with a larger tooth root pressure angle.

To explain this with reference to the embodiments shown in the figures, Fig. 2 shows an automatic gear sorting machine that implements the invention, Fig. 3 shows the tooth profile portions of the master gear and gear to be measured that implement the invention, and Fig. , among the master gears shown in FIG. 2, master gear A has a torsion angle α that is smaller by γ than the torsion angle β of gear B to be measured.
Here, what is indicated by a chain double-dashed line is the tooth profile B of the gear to be measured. When installing master gear A with a slightly smaller helix angle α in the conventional automatic gear sorting machine shown in Fig. 1,
Even if a dent exists on the tooth tip or both ends of the gear to be measured, the tooth surface of the master gear comes into contact with that part during meshing, and fluctuations due to the dent are sensed. In comparison, it is possible to more accurately select dents that exceed the allowable amount.
Furthermore, B shows a gear to be measured whose helix angle is β and the tooth width is L.

Additionally, if the master gear meshes with the tooth tip lowered (increasing the tooth root pressure angle of the master gear relative to the tooth root pressure angle of the measured gear), the contact with the tooth tip can be made even more effective. It is.

Furthermore, as shown in FIG. 2, if the master gear is separated into one for detecting dents and one for detecting other elements, the selection can be carried out more effectively. Now, to explain the outline of the device shown in Figure 2,
A ₁ and A ₂ are both master gears finished with high precision, of which A ₁ is for dents, A ₂ is for eccentricity, size (tooth groove deviation, 1 pitch meshing error,
This is the master gear for Those master gears A ₁ and A ₂ are both fixed to shafts 2 and 3, and these shafts 2 and 3 are connected to drive motors 6 and 7 via universal joints 4 and 5, respectively, and their rotation causes Master gears A ₁ and A ₂ rotate. The shafts 2 and 3 are rotatably attached to support stands 12 and 13, respectively, and the support stands 12 and 13 are
They are fixed to measurement parts C ₁ and C ₂ that are supported by rollers, for example, and can reciprocate without resistance on lines connecting the centers of master gears A ₁ and A ₂ and the center of gear B to be measured, respectively. On the other hand, the gear to be measured B is rotatably mounted on a support base 11 fixed on the machine base, and rotates according to the rotation of the master gears A ₁ and A ₂ . Note that the master gears A ₁ and A ₂ can be meshed with the gear to be measured B separately or simultaneously, and when they are meshed simultaneously, they can be operated by driving one drive motor. Reference numeral 8 denotes an adjustment spring for making the meshing pressure of the gear to be measured constant. Reference numeral 9 denotes a measuring pressure spacer, which is adjusted by adjusting the thickness of the spacer to make the meshing angle between the master gear and the gear to be measured constant. 10 is an air-hydro cylinder.

In the case of the embodiment shown in Fig. 2, in order to measure the dents, as shown in Fig. 3A, the dent master gear A is
In this case, the torsion angle а is the angle β of the gear to be measured.
1'30'' to 2'30'', that is, reduce γ in Fig. 3 A to increase the contact between the tooth tip and both ends, to make their selection effective, and to In the case of master gear A, the tooth width N is 20% longer than the tooth width of the gear to be measured, and the tooth surface of master gear A for dents is set at the tooth tip where the most dents occur. , both ends can be touched to enable sensing.

In Fig. 3A, N is the master gear A for dents.
The tooth width L indicates the tooth width of the gear to be measured.

As an example of this invention, what is shown in FIG.
Since the configuration is as described above, the drive motors 6 and 7
When the master gears A ₁ and A ₂ rotate, the measured gear B that meshes with them rotates, and the variation between their central axes (changes due to various requirements of the measured gear)
is transmitted to master gears A ₁ and A ₂ , but since both master gears A ₁ and A ₂ can move on the machine without resistance, they will move even with slight fluctuations, and the fluctuation value will be detected by an electric micro. This electrical signal is read and transmitted to the calculation unit, which is compared with the set value in the same way as a conventional automatic sorting machine, and the quality of each is displayed. If all conditions are satisfied, that gear is adopted. This is how the selection is performed.

As described above, the present invention can perfectly detect dents as described above, not only in conventional gear automatic sorting machines, but also in those that are provided with separate master gears for dents and other elements. This has remarkable effects such as allowing automobiles to be equipped with transmissions that produce less noise.

[Brief explanation of drawings]

Fig. 1 shows a conventional gear automatic sorting machine, Fig. 2 shows a gear automatic sorting machine equipped with a plurality of master gears for each element, and Fig. 3 shows an image master gear and a rotor in Fig. 2. , each tooth profile of the gear to be measured is shown. A, A ₁ , A ₂ ... Master gear, B ... Gear to be measured, C ... Support section, C ₁ , C ₂ , D ... Measurement section,
1, 2, 3... shaft, 4, 5... universal joint, 6, 7
...Drive motor, 8...Measuring spring, 9...
...Measuring pressure spacer, 11, 12, 13... Support stand.

Claims (1)

[Claims] 1. In an automatic gear sorting machine that measures the rotational variation of the center position of the gear to be measured and the master gear by meshing two tooth flanks, and compares this with a set value, the gear to be measured is automatically judged to be good or bad. An automatic gear sorting machine in which the torsion angle of the master gear is slightly smaller than the torsion angle of the measuring gear, and the root pressure angle of the master gear is larger than the root pressure angle of the gear to be measured.