Gear inspection apparatus and gear inspection program

Abstract

To cancel an eccentricity amount of a master gear with a simple configuration.SOLUTION: A gear B being a measurement object is selected. Next, a gear A which is in a relationship of a prescribed ratio with the gear B is selected. The selected gear A and gear B are mounted on a support unit and meshed together while pressing both gears against each other. Rotation is performed by a necessary number of times according to the ratios of the gear A and the gear B. Since eccentricity of the gear A is canceled by the prescribed number of rotations, an eccentricity amount E of the gear B can be obtained from measurement data by measuring a center distance C measured during the rotation. The gear A exhibits different eccentricity depending on an attachment / detachment state. However, since the eccentricity of the gear A can be canceled by only a prescribed number of rotations, it is suitable for measuring the eccentricity amount E of multiple types of gears B for which attachment / detachment of the gear A becomes more frequent.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a gear inspection device and a gear inspection program for inspecting eccentricity of a product gear by using a master gear. [Background technology]

[0002] A gear inspection machine as described in Patent Document 1 is known as a conventional gear inspection machine. In this gear inspection machine, a reference gear is rotated together with the test gear while meshing the reference gear with the test gear, and the displacement of the center distance between the reference gear and the test gear and the runout of the rotation shaft of the test gear are detected using a displacement sensor for the test gear and a displacement sensor for the base of the reference gear. A calculation means calculates the displacement of the test gear by correcting the detection value of the displacement sensor for the base using the detection value of the displacement sensor for the test gear and a distortion of the reference gear calculated in advance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-314679 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above conventional gear inspection machine, a displacement sensor is provided to measure the distortion of the gear under test without being affected by distortion of the shaft hole of the gear under test. This results in a large number of parts, and the handling of the displacement sensor becomes complicated because it measures the shaft of the gear under test. The present invention has been made to solve these problems. [Means for solving the problem]

[0005] The gear inspection device of the present invention comprises gear rotating means for rotatably supporting a master gear and a product gear and rotating the master gear and the product gear in a meshed state, storage means for storing a predetermined ratio of the numbers of teeth of the master gear and the product gear as a:b, and calculation processing means for dividing the a period of the master gear having a sine curve by the b period of the product gear, overlapping them to cancel the phase and thereby cancel the amount of eccentricity of the master gear, and measuring the axis distance between the master gear and the product gear to calculate the amount of eccentricity of the product gear.

[0006] Furthermore, the gear inspection device of the present invention has a gear rotating means for rotatably supporting the master gear and the product gear and rotating the master gear and the product gear in a meshed state, a monitor gear which replaces the product gear and is machined with higher precision than the product gear, and a calculation processing means for rotating the master gear in meshed state with the monitor gear and obtaining the amount of eccentricity of the master gear by subtracting the eccentricity information of the monitor gear (including the case where the eccentricity is regarded as 0) from the obtained amount of eccentricity, and for rotating the master gear having obtained the amount of eccentricity in meshed state with the product gear, and calculating the amount of eccentricity of the product gear by subtracting the amount of eccentricity of the master gear from the obtained amount of eccentricity.

[0007] Furthermore, the gear inspection device of the present invention has gear rotating means for rotatably supporting the master gear and the product gear and rotating the master gear and the product gear in a meshed state, storage means for storing the amount of eccentricity of the master gear measured using the precisely machined product gear, and calculation processing means for rotating the product gear at least once to measure the centerline distance with the master gear, subtracting the amount of eccentricity of the master gear from this centerline distance, and calculating the amount of eccentricity of the product gear.

[0008] The gear inspection program according to the present invention includes a computer, a gear rotation control means for controlling rotation of a master gear and a product gear which are rotatably supported by a shaft, a storage means for storing a predetermined ratio of the numbers of teeth of the master gear and the product gear as a:b, and The period a of the master gear having a sine curve is divided by the period b of the product gear, and these are overlapped to cancel the phase, thereby canceling the eccentricity of the master gear, and the amount of eccentricity of the product gear is calculated by measuring the axis distance between the master gear and the product gear, thereby functioning as a calculation processing means.

[0009] Furthermore, the gear inspection program of the present invention causes the computer to function as a gear rotation control means for controlling the rotation of a master gear rotatably supported by a journal and a product gear, and a calculation processing means for rotating the master gear in mesh with a monitor gear which is machined to have higher precision than the product gear instead of the product gear, obtaining the amount of eccentricity of the master gear by subtracting the eccentricity information of the monitor gear (including the case where the eccentricity information is regarded as 0) from the obtained amount of eccentricity, and for rotating the master gear having obtained the amount of eccentricity in mesh with the product gear, and calculating the amount of eccentricity of the product gear by subtracting the amount of eccentricity of the master gear from the obtained amount of eccentricity.

[0010] Furthermore, the gear inspection program of the present invention causes a computer to function as a gear rotation control means for controlling the rotation of the master gear and the product gear, which are rotatably supported by a shaft; a storage means for storing the amount of eccentricity of the master gear measured using the precisely machined product gear; and a calculation processing means for rotating the product gear at least once to measure the centerline distance between the product gear and the master gear, subtracting the amount of eccentricity of the master gear from the centerline distance, and calculating the amount of eccentricity of the product gear. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a configuration diagram showing a gear inspection machine according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram of the gear correction device. [Diagram 3] 1 is a graph showing a method for canceling an eccentricity amount D of gear A due to rotation of gears A and B. FIG. [Figure 4] 1 is a graph showing a method for canceling an eccentricity amount E of gear B due to rotation of gears A and B. FIG. [Diagram 5] 4 is a flowchart showing a measurement procedure in the gear inspection device. [Figure 6] 4 is a flowchart showing a measurement procedure in the gear inspection device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] FIG. 1 is a configuration diagram showing a gear inspection machine according to a first embodiment of the present invention. FIG. 2 is a block diagram of the gear correction device. This gear inspection machine 100 has a main body 1 on which a master gear is attached, and a slider 2 for attaching a gear to be measured that is to be inspected. The main body 1 is provided with a rotating shaft 5 for attaching and detaching a gear A (gear A is the master gear; the same applies below) above a support part 4 provided on a bed 3. Gear A is attached by passing the rotating shaft 5 through a central hole. A rotation angle reference point A1 is provided on gear A to identify the meshing portion. The support part 4 is provided with a position sensor 10 for detecting the position of gear A, and an angle sensor 11 for detecting the rotation angle.

[0013] The slider 2 is provided with a support part 6 to which a gear B (gear B is a product gear to be measured; the same applies below) is attached, and a rotating shaft 6 for attaching and detaching the gear B. The support part 6 is biased in the direction of the support part 4 by an actuator (not shown). The rotating shafts 5 and 7 are driven and controlled by motors 5a and 6a.

[0014] The eccentricity of the rotating shafts 5, 7 includes the eccentricity that occurs when the gears A, B are rotated around the rotating shafts 5, 7 in both cases where the gears A, B have rotating shafts (holes in the support parts) and where the support parts 4, 6 have rotating shafts (holes in the gears).

[0015] In the present invention, the ratio a:b of the number of teeth of gear A to gear B is preferably 2:3, 3:5, 3:7, 5:7 or 3:2, 5:3, 7:3, 7:5 when a monitor gear described later is not used.

[0016] As shown in Figure 2, this gear inspection machine 100 is composed of a memory unit 21 that stores data related to gear A, a processing unit 22 that calculates the amount of eccentricity of gear B, an angle sensor 11 and a position sensor 10 connected to the processing unit 22, a control unit 23 that controls the operation of the entire device, a driver circuit 24 that drives each motor, an input unit 25, a display unit 26, and a distance sensor 27 that measures the axis distance C (constant value + amount of eccentricity) between gears A and B.

[0017] Next, the procedure for measuring the eccentricity of Gear B will be described. Gears A and B are mounted on the rotating shafts 5 and 7 of the supports 4 and 6. Gear A is paired with Gear B. Gear A's inspection accuracy varies because the eccentricity of the rotating shaft 5, eccentricity due to machining accuracy, and eccentricity of the mounting surface are added to the center distance C. Therefore, in order to obtain the center distance C, Gears A and B are rotated a predetermined number of times while meshed with each other to cancel the eccentricity of the rotating shaft 5 of Gear A and improve the inspection accuracy.

[0018] The ratio a:b of the teeth of gear A and gear B is, for example, 2:3. Gear A is biased and pressed against gear B by slider 2, and gear A is rotated in this state. When gear A rotates three times from a predetermined position, gear B rotates two times. Since the present invention targets the cancellation of eccentricity having a sine curve, the eccentricity to be cancelled is the eccentricity of rotating shaft 5. The amount of eccentricity of gear A is D. The amount of eccentricity E is the amount of eccentricity due to the rotating shaft of gear B that exhibits the characteristics of a sine curve.

[0019] Fig. 3 is a graph showing a method for canceling the eccentricity D of gear A due to the rotation of gear A and gear B. The vertical axis shows the eccentricity, and the horizontal axis shows the phase and period of the gear rotation. As shown in Fig. 3(a), gear A rotates three times, resulting in an eccentricity D that shows a sine curve of three wavelengths. On the other hand, as shown in Fig. 3(b), gear B rotates two times for every three rotations of gear A, resulting in an eccentricity E that shows a sine curve of two wavelengths.

[0020] The center distance C is the cumulative sum of the eccentricities D and E of gears A and B. The eccentricity D of gear A is divided by 2, the rotation speed of gear B, and the results are overlapped to cancel the phase (see Figure 1(a)). This cancels the eccentricity of gear A. On the other hand, the eccentricity E of gear B is calculated by dividing two periods by 2, the rotation speed of gear B, and then overlapping these. This doubles the eccentricity E, so by dividing this by 2, the eccentricity E of gear B is obtained.

[0021] This gear inspection device 100 uses a master gear with a predetermined ratio to the product gear, so that the amount of eccentricity can be easily cancelled and the amount of eccentricity E of the product gear can be measured.

[0022] Similarly, the eccentricity of gear A can also be measured. Figure 4 is a graph showing a method for canceling the eccentricity E of gear B due to the rotation of gears A and B. The vertical axis represents the eccentricity, and the horizontal axis represents the phase and period of the gear rotation. As shown in Figure 4(a), gear A rotates three times, resulting in an eccentricity D that shows a sine curve spanning three wavelengths. On the other hand, as shown in Figure 4(b), of these three wavelengths, gear B rotates two times, resulting in an eccentricity E of two wavelengths.

[0023] Center distance C is the cumulative amount of eccentricity of gear A and gear B, so the eccentricity E of gear B is divided by 3, the rotation speed of gear A, and the results are added together. This cancels out the eccentricity of gear B. On the other hand, the eccentricity D of gear A is calculated by dividing three periods by 3, the rotation speed of gear A, and then adding these results together. As a result, the eccentricity D becomes three times, so by dividing this by 3, the eccentricity D of center distance C is obtained.

[0024] Once the eccentricity D of gear A is obtained, it is necessary to identify the meshing portion of gear A, so a rotation angle reference point A1 is provided on gear A or the rotating shaft, a position sensor 10 and an angle sensor 11 are installed, and the absolute value of the meshing angle of gear A is obtained. Since the eccentricity D of gear A is identified by the rotation angle, the eccentricity E of gear B can be measured by subtracting the eccentricity D included in the actually measured center distance C. For this reason, gear B is rotated once, and then the eccentricity E of gear B can be measured by calculation processing.

[0025] The eccentricity D of the gear A may be measured using a monitor gear, which will be described later.

[0026] As described above, this gear inspection device 100 is capable of performing two types of eccentricity correction. First, as a method of correcting eccentricity after each measurement, when the production volume is large and the master gear, Gear A, is frequently attached and detached, the eccentricity of Gear A is cancelled by using the ratio of the number of teeth as described above. In this case, there is no need to detect the angle reference. Also, although a master gear with a specified ratio of the number of teeth is required, it is possible to measure the eccentricity E of Gear B, the product gear, without the need to prepare a high-precision monitor gear, which will be described later. The closer the ratio is to 2:3, the lower the number of rotations required for measurement, so it is preferable to prepare a master gear with a ratio close to that for each product gear.

[0027] Moreover, the memory unit 21 only needs to store data on the number of teeth of the gear A and the gear B. The user inputs information on the gear A to be used and the gear B to be measured to the processing unit 22. FIG. 5 is a flow chart showing the measurement procedure in the gear inspection device. The user selects the gear B to be measured (step S1). Next, the user selects the gear A that has a predetermined ratio to the gear B (step S2). The selected gear A and gear B are attached to the support units 4 and 6 (step S3), and the gears are pressed against each other while meshing, and rotated a required number of times according to the ratio of the gear A and the gear B (step S4). Since the eccentricity of the gear A is cancelled by a predetermined number of rotations (step S5), the axial distance C measured during the rotation is measured, and the eccentricity amount E of the gear B can be obtained from the measurement data (step S6). The gear A shows different eccentricity depending on the state of attachment and detachment, and since the eccentricity of the gear A can be cancelled by only a predetermined number of rotations, it is suitable for measuring the eccentricity amount E of many types of gear B in which the gear A is frequently attached and detached. When measuring the eccentricity D of gear A, the above-mentioned gears A and B can be reversed to obtain the measurement.

[0028] Secondly, the amount of eccentricity of Gear A is determined with high accuracy using Gear B as a monitor gear. The monitor gear is Gear B which has been machined with high accuracy, adjusted, and its amount of eccentricity determined separately. FIG. 6 is a flow chart showing the measurement procedure in the gear inspection device. The user first selects Gear A (Step S11). Next, the user selects the monitor gear (Step S12). Next, Gear B and Gear A are attached (Step S13), meshed, and rotated (Step S14). Since the amount of eccentricity of the monitor gear is known (or is not machined with high accuracy), the amount of eccentricity D of Gear A can be obtained (Step S15).

[0029] In this case, the memory unit 21 stores the amount of eccentricity D of gear A measured using gear B as the monitor gear. When there are multiple gears A, the amount of eccentricity D of each gear A is stored. Since the amount of eccentricity D is measured in detail according to the rotational position of gear A, the amount of eccentricity D is stored in predetermined rotational angle units based on the reference position of gear A. Furthermore, a mark A1 of the reference position is provided on gear A.

[0030] The obtained eccentricity amount D is more accurate than that obtained from the product gear B. Once the eccentricity amount D of gear A has been obtained, since the eccentricity amount D is known according to the rotation angle, the reference position and angle of gear A are detected using the position sensor 10 and angle sensor 11 (step S16), and the product gear B is measured to obtain the eccentricity amount E (step S17).

[0031] Specifically, with gear A attached, gear B is attached to support portion 6 and rotated, while the reference position of gear A is obtained by the position sensor 10, and measurement of gear B by gear A is started at that position. When gear A rotates a predetermined number of times, gear B rotates once, and the rotation is terminated at this point. Since gear B includes eccentricity D of gear A for the number of rotations, this eccentricity D is subtracted from the measured center distance C to obtain the eccentricity E of gear B. These calculations are performed by processing unit 22. This measurement method is suitable for the case where the eccentricity D of gear A is accurately obtained by a monitor gear, and the eccentricity E of many types of gears B is measured without removing gear A. Furthermore, since it does not depend on the ratio of the number of teeth of gear A and gear B, it is not necessary to prepare many gears A.

[0032] Thirdly, the gear inspection machine 100 may measure the amount of eccentricity due to the machining of the gear B by combining the above-mentioned two measurement methods. The amount of eccentricity due to the machining of the gear B is not sinusoidal, so phase cancellation is not possible. In contrast, the data obtained by measuring the amount of eccentricity of the gear A in degrees using a monitor gear includes both the eccentricity that shows a sinusoidal curve and the eccentricity due to the machining. For this reason, the gear B, which is the product, is rotated to cancel the eccentricity of the gear B that has a sinusoidal curve. In this state, the center distance C includes the amount of eccentricity of the gear A, but the amount of eccentricity of the gear A includes both the eccentricity of the sinusoidal curve and the eccentricity of the non-sinusoidal curve, so by subtracting the known amount of eccentricity of the gear A from the center distance C, the amount of eccentricity of the gear B that has a non-sinusoidal curve due to the machining can be obtained. These processes are performed by the processing unit 22. [Explanation of symbols]

[0033] 100 Gear inspection machine 1 Main unit 2 Slider 3 Beds 4,6 Support part 5,7 Rotation axis

Claims

1. a gear rotating means for rotatably supporting the master gear and the product gear and rotating the master gear and the product gear in a meshed state; a memory means for storing a predetermined ratio of the numbers of teeth of the master gear and the product gear as a:b; a calculation processing means for dividing a period a of a master gear having a sine curve by b of a period b of a product gear, overlapping the divided periods to cancel the phases of the divided periods, thereby canceling the amount of eccentricity of the master gear, and calculating the amount of eccentricity of the product gear by measuring the axis distance between the master gear and the product gear; A gear inspection device having the above structure.

2. a gear rotating means for rotatably supporting the master gear and the product gear and rotating the master gear and the product gear in a meshed state; A monitor gear that is machined with higher precision than the product gear is used instead of the product gear. a calculation processing means for rotating the master gear in mesh with the monitor gear, obtaining the amount of eccentricity of the master gear by subtracting the eccentricity information of the monitor gear (including the case where the eccentricity information is regarded as 0) from the obtained amount of eccentricity, and for rotating the master gear having the obtained amount of eccentricity obtained in mesh with a product gear, and calculating the amount of eccentricity of the product gear by subtracting the amount of eccentricity of the master gear from the obtained amount of eccentricity; A gear inspection device having the above structure.

3. a gear rotating means for rotatably supporting the master gear and the product gear and rotating the master gear and the product gear in a meshed state; a storage means for storing the amount of eccentricity of the master gear measured using the precisely machined product gear; a calculation processing means for measuring an axial distance between the product gear and a master gear by rotating the product gear at least once, subtracting an amount of eccentricity of the master gear from the axial distance, and calculating an amount of eccentricity of the product gear; A gear inspection device having the above structure.

4. Computer, a gear rotation control means for controlling the rotation of the master gear and the product gear which are rotatably supported; a memory means for storing a predetermined ratio of the numbers of teeth of the master gear and the product gear as a:b; a calculation processing means for dividing a period a of a master gear having a sine curve by b of a period b of a product gear, overlapping the divided periods to cancel the phases of the divided periods, thereby canceling the amount of eccentricity of the master gear, and calculating the amount of eccentricity of the product gear by measuring the axis distance between the master gear and the product gear; Gear inspection program to ensure proper functioning.

5. Computer, a gear rotation control means for controlling the rotation of the master gear and the product gear which are rotatably supported; a processing means for rotating the master gear in mesh with a monitor gear which is machined to have higher accuracy than the product gear, and obtaining the amount of eccentricity of the master gear by subtracting the eccentricity information of the monitor gear (including the case where the monitor gear is regarded as 0) from the obtained amount of eccentricity, and for rotating the master gear having the obtained amount of eccentricity in mesh with the product gear, and calculating the amount of eccentricity of the product gear by subtracting the amount of eccentricity of the master gear from the obtained amount of eccentricity; Gear inspection program to ensure proper functioning.

6. Computer, a gear rotation control means for controlling the rotation of the master gear and the product gear which are rotatably supported; a storage means for storing the amount of eccentricity of the master gear measured using the precisely machined product gear; a calculation processing means for measuring an axial distance between the product gear and a master gear by rotating the product gear at least once, subtracting an amount of eccentricity of the master gear from the axial distance, and calculating an amount of eccentricity of the product gear; Gear inspection program to ensure proper functioning.

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