JPH031801Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to gear testing, and more particularly to gear meshing testing equipment.

Conventional technology As one of the tests to detect gear specifications such as overball diameter, tooth groove runout, and meshing error,
A meshing test is conventionally known in which a master gear and a gear to be inspected are meshed and rotated, and changes in the distance between the axes of the two gears are measured, and the above-mentioned specifications are obtained based on the measurement results.

Problems to be Solved by the Invention In such a gear meshing test, if the gear to be inspected is heated due to machining such as shaving or cleaning, the gear to be inspected is substantially at room temperature. A temperature difference occurs between the master gear and the master gear, which causes errors in the measurement of the gear's overball diameter and tooth space contact, among other things. In addition, in order to reduce such measurement errors, if the machined or cleaned gear to be inspected is cooled by a cooler or by leaving it in a work stocker, the gear meshing test becomes expensive and the gear production line becomes too expensive. This is complicated, and furthermore, the meshing test requires a long time because the test cannot be performed until the gear to be inspected has cooled to room temperature.

In view of the above-mentioned problems in conventional gear meshing tests, the present invention provides an improved gear meshing testing device that can accurately measure the overball diameter of gears even after processing or cleaning. is intended to provide.

Means for Solving the Problems According to the present invention, the above object is to provide a support device that rotatably supports a master gear and a gear to be inspected in a meshed state, and a support device for rotatably supporting a master gear and a gear to be inspected. an inter-axle distance measuring device that measures a change in the distance between the axes of both gears due to meshing; a rotation angle detection device that detects a rotation angle of the gear to be inspected; a temperature measuring device movable between a first position for measuring the temperature of the gear to be inspected and a second position for measuring room temperature away from the gear to be inspected;
The inter-axle distance signal generated by the inter-axle distance measuring device and the inspected gear temperature signal and room temperature signal generated by the temperature measuring device are inputted, and a temperature difference between the inspected gear temperature and the room temperature is calculated. This is achieved by a gear mesh testing apparatus having an arithmetic and control unit that corrects the inter-axle distance signal based on the temperature difference.

Effects and Effects of the Invention According to the invention, the change in the distance between the axes due to the rotation of the master gear and the gear to be inspected is measured by the inter-axle distance measuring device and the rotation angle detection device, and the change in the inter-axle distance The value of is modified by the temperature difference between the tested gear and the room temperature, and therefore between the tested gear and the master gear, so that the change in the true center distance, i.e., the master gear and the tested gear Since the change in the distance between the shafts is calculated when both are at the same temperature, even when there is a temperature difference between the master gear and the gear to be inspected,
It is possible to accurately measure gear overball diameter, tooth space runout, and meshing error based on changes in the true center distance.

Furthermore, according to the meshing test device of the present invention, one temperature measuring device measures both the temperature of the gear to be inspected and the room temperature, so only one temperature measuring device is required, and these temperatures can be measured separately. The temperature difference between the temperature of the gear to be inspected and the room temperature can be measured more accurately than when measuring with a device, and therefore the overball diameter of the gear can be measured accurately. Furthermore, since there is no need to cool down the gear to be inspected, which is hot due to machining and cleaning, and there is no need for a cooler or workpiece stocker to cool the gear, it is possible to use an in-line system in the gear production process. The size of gears, etc. can be measured in a short time at low cost.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

Embodiment FIGS. 1 and 2 are a plan view and a simplified front view showing one embodiment of the meshing test device according to the present invention, respectively, and FIG. 3 is a sectional view taken along the line - in FIG. 1. . In these figures, 1 indicates a base, on which support stands 2 to 5 are fixed. A support member 6 is fixed on the support base 2, and the support member 6 is connected to the center 8 by means of a bearing (not shown) at the center stock portion 7.
It is rotatably supported around. A support member 10 is mounted on the support base 3 so as to be able to reciprocate along the axis 9, and can be fixed at a predetermined position with respect to the support base 3 as required. The support member 10 supports a center 12 rotatably around an axis 9 at a center stock portion 11 via a bearing (not shown). The centers 8 and 12 cooperate with each other to form a gear shaft 14 having a gear 13 to be inspected.
is rotatably supported around an axis 9. The gear shaft 14 is rotatably driven around the axis 9 by a motor 15 fixed to the support base 3 via a drive gear 17 that meshes with another gear 16 on the gear shaft.

The support base 4 has an L-shaped pivoting lever member 18.
is pivotably supported about an axis 19 parallel to axis 9. One arm 2 of lever member 18
A master gear support member 21 is fixed to the tip of the gear 0. The master gear support member 21 is the gear to be inspected 1
Master gear 2 meshes with 3 in a seamless manner.
2 is rotatably supported around an axis 23 parallel to the axis 9. In this case, when the master gear 22 and the gear to be inspected 13 are in mesh with each other in a no-butt lock, as shown in FIG. The straight line 20a passing through is orthogonal to the straight line 20a.

Further, a rotary encoder 24 is attached to the master gear support member 21 to detect the rotation angle (rotation phase) of the master gear. The rotary encoder 24 photoelectrically detects the rotation angle of the master gear.
Arithmetic control device 4 which will be described later in response to electrical signals
It is designed to output to 0. Further, a compression coil spring 26 is interposed between the other arm 25 of the lever member 18 and the base 21, and biases the lever member 18 counterclockwise around the axis 19 when viewed in FIG. The lever member 18 is connected to the master gear 22.
The gear is supported between a first position shown in the figure where the master gear meshes with the gear 13 to be inspected in a no-butt lock, and a second position not shown in the figure where the master gear disengages from the gear to be inspected. The positioning device 27 provided on the base 3 selectively positions the base 3.

A displacement sensor 28 is attached to the support base 5. The displacement sensor 28 is a type of sensor such as a differential transformer that converts a linear displacement into an electrical quantity, and its probe 29 is arranged along an axis 30 perpendicular to a straight line 25b passing through the contact point 25a at the tip of the arm 25 and the axis 19. It extends along the axis 30 and comes into contact with the tip of the arm 25 to detect the amount of displacement of the tip of the arm 25 along the axis 30 as the lever member 18 pivots. The amount of displacement of the tip of the arm 25 is determined by the distance between the axes of the gear to be inspected 13 and the master gear 22, that is, the axis 19.
and the axis 23, the displacement sensor 28 essentially measures the amount of change in the distance between the axes. The electric signal generated by the displacement sensor 28 is output to the arithmetic and control unit 40 .

Furthermore, a temperature measuring unit 31 is provided on the support base 2 at a position close to the support member 7. The temperature measuring unit 31 includes a temperature sensor 32 and an actuator 33, and the temperature sensor is moved by the actuator to a first position shown in the figure where it contacts the gear to be inspected 13 to measure the temperature of the gear to be inspected, and a position away from the gear to be inspected. A second position, not shown, is adapted to be selectively positioned to measure the room temperature. The temperature sensor outputs a signal indicating the temperature of the gear to be inspected and the room temperature to the arithmetic and control unit 40. In particular, in the illustrated embodiment, the temperature sensor is designed to accurately measure the temperature of the gear to be inspected. is maintained at the first position by a command signal from the arithmetic and control unit for several seconds to 10 seconds until the probe reaches substantially the same temperature as the gear to be inspected, and is normally maintained at the second position. It's getting old. Further, a rotary encoder 34 is attached to the supporting member 6 on the side opposite to the center 8, and the rotary encoder photoelectrically detects the rotation angle of the center 8 and therefore the rotation angle of the gear 13 to be inspected. , and outputs a corresponding signal to the arithmetic and control unit 40.

FIG. 4 is a block diagram showing the electrical circuit of the device according to the invention. The arithmetic and control device 40 includes an AC amplification circuit 41, into which an output signal (AM signal) generated by the displacement sensor 28 is input. The output signal of the AC amplifier circuit 41 is output to a synchronous rectifier circuit 42, rectified by the circuit, and input to a DC amplifier circuit 43 and a bandpass filter 44. Further, the arithmetic and control device 40 includes an AC amplifier circuit 4
5, and receives the output signal generated by the temperature sensor 32 in the AC amplifier circuit. The output signals of the DC amplifier circuit 43, bandpass filter 44, and AC amplifier circuit 45 are input to different input terminals of the A/D converter 46, respectively. The converter 46 has an internal multiplexer, and the multiplexer controls switching of signals input to the converter. The output signal of the DC amplifier circuit 43 is used to evaluate the overball diameter of the gear, the runout of the tooth space, etc., and the output signal of the bandpass filter 44 is used to evaluate the meshing error of the gear.
The output signals of the AC amplifier circuit 45 are used for temperature correction of these output signals.

The output signal of the A/D converter 46 is connected to the common bus 47.
The signal is then input to a central processing unit (CPU) 48. The central processing unit 48 processes signals according to a program stored in a read-only memory 49, and transfers the signals from the A/D converter 46 to a random access memory (RAM) 50 as necessary.
It is now output to .

The arithmetic control device 40 has a digital input/output circuit 51
The output signals of the rotary encoders 24 and 34 are input to the digital input/output circuit. Digital input/output circuit 5
Rotary encoders 24 and 34 input to 1
The signals are input to the central processing unit 48 via the common bus 47. Further, the digital input/output circuit 51 is connected to a sequence control device 52. Signals generated by the sequence controller 52 are input from the digital input/output circuit 51 to the central processing unit 48 via the common bus 47. The sequence control device 52 generates a command force signal through a switch operation by an operator, and controls the operation of the program stored in the read-only memory 49 in response to the command force signal.

The read-only memory 49 is connected to the central processing unit 4.
The correction value for the output signal from the A/D converter 46 is stored using the temperature difference between the gear 13 to be inspected 13 calculated by 8 and the room temperature as an address. Furthermore, the random access memory 50 is connected to the rotary encoder 3.
4, in other words, the A/D converter 46 uses the code corresponding to the rotation angle of the gear 13 to be inspected as the address.
It is designed to memorize the output signal of

The central processing unit performs various calculations and signal processing according to the programs stored in the read-only memory 49, and controls the setting device 5 of the judgment display device 53.
4 and is input as a comparison reference signal from the digital input/output circuit 55 via the common bus 47 with the value of the calculation result, and a signal representing the comparison result is sent via the common bus 47 to the digital input/output circuit 55. The output signal is output to the display 56 of the judgment display device 53.

Next, the operation of the apparatus of the present invention will be explained with reference to the flowchart shown in FIG.

First, the gear shaft 14 is installed between the centers 8 and 12 so as to be rotatable around the axis 9 with the gear 16 meshing with the drive gear 17, and then the lever member 18 is moved to the first position by the positioning device 27. As a result, the gear to be inspected 13 and the master gear 22 are brought into mesh with each other with no backlash. Next, each step shown in FIG. 5 is sequentially executed in response to a command input signal from the sequence control device 52.

In the first step 1, the room temperature is measured by the temperature sensor 32 of the temperature measuring unit 31 located at the second position. In the next step 2, the temperature sensor 32 is driven to the first position shown, and the temperature of the gear 13 to be inspected is measured by the temperature sensor 32. In the next step 3, the motor 15 is energized so that the drive gear 1
7, the rotation of the gear shaft 14 and therefore the gear 13 to be inspected is started. In the next step 4, information on the rotation angle and the displacement amount of the tip of the arm 25 of the lever member 18 is read for each minute rotation angle of the gear 13 to be inspected, and each value is stored in the random access memory 50. be done. In the next step 5,
It is determined whether reading of the rotation angle of the gear 13 to be inspected and the amount of displacement of the tip of the arm 25 has been completed, that is, whether the gear 13 to be inspected has rotated 360 degrees. In this step, the gear 13 to be inspected is heated to 360°C.
If it is determined that the rotation is less than that, the process returns to step 4, and reading of the rotation angle of the gear to be inspected and the amount of displacement of the tip of the arm 25 is repeated. In step 5, the gear 13 to be inspected is heated to 360℃.
If it is determined that the rotation has occurred, the process advances to the next step 6.

In step 6, the power supply to the motor 15 is stopped, thereby stopping the rotation of the gear 13 to be inspected. In the next step 7, based on the data stored in the random access memory 50, the gear to be inspected is rotated for each minute rotation angle of the gear to be inspected.
3 and the master gear 22 is calculated. This calculation result is visually represented as shown in FIG. In the next step 8, the temperature difference between the tested gear temperature and room temperature data stored in the random access memory 50 is calculated, and a correction value based on the temperature difference is stored in the read-only memory 49. The correction value is subtracted from the result of the axle distance calculation read out and calculated in step 7, and as a result, as shown in FIG. 7, the gear to be inspected and the master gear are brought to the same temperature state. The amount of change in the distance between these axes in a certain case is determined. In the next step 9, based on the change in the true center distance obtained in step 8, the overball diameter Dw, tooth space runout Fw, and meshing error Ew are calculated as shown in Fig. 7. These values are compared with comparison reference values input from the setting device 14, and the result of pass/fail is displayed on the display 56, and a correction command signal is issued to the gear machining process as necessary.

Furthermore, in the meshing test device according to the present invention, as disclosed in Japanese Patent Application No. 55-99091 (Japanese Unexamined Patent Publication No. 57-23835) filed by the same applicant as the present applicant, it may be used instead as a master gear. A master gear may also be used. In addition, in the meshing test device according to the present invention, the increment amount of the temperature of the gear to be inspected from the temperature sensor 32 is calculated every minute time, and when the increment amount reaches a predetermined value of zero or close to zero, the temperature sensor 32 to its second position, and the temperature value measured at that time may be used as the temperature of the gear to be inspected for calculation.

Although the present invention has been described above in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and it is understood that various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art. For example, calculation of the temperature difference between the temperature of the gear to be inspected and the room temperature may be performed at any stage after step 2 and before step 8 of the flowchart of FIG.

[Brief explanation of the drawing]

1 and 2 are a plan view and a simplified front view showing one embodiment of the gear meshing test device according to the present invention, FIG. 3 is a sectional view taken along the line - of FIG. 1, and FIG. The figure is a block diagram showing the electrical circuit of the device according to the present invention, Figure 5 is a flowchart showing the routine of the control system of the device according to the present invention, and Figure 6 is the relationship between the gear to be inspected and the master gear before temperature correction. A graph showing the relationship between the value of the center distance and the rotation angle of the gear to be inspected. Figure 7 shows the value of the center distance between the gear to be inspected and the master gear after temperature correction and the rotation angle of the gear to be inspected. It is a graph showing the relationship between DESCRIPTION OF SYMBOLS 1... Base, 2-5... Support stand, 6... Support member, 7... Center stock part, 8... Center, 9
... Axis line, 10 ... Support member, 11 ... Center stock part, 12 ... Center, 13 ... Gear to be inspected, 14 ... Gear shaft, 15 ... Motor, 16 ...
Gear, 17... Drive gear, 18... Pivoting lever member, 19... Axis line, 20... Arm, 21... Master gear support member, 22... Master gear, 23...
...Axis line, 24...Rotary encoder, 25...
Arm, 26... Compression coil spring, 27... Positioning device, 28... Displacement sensor, 29... Measuring head, 30... Axis line, 31... Temperature measurement unit,
32... Temperature sensor, 33... Actuator,
34... Rotary encoder, 40... Arithmetic control unit, 41... AC amplifier circuit, 42... Synchronous rectifier circuit, 43... DC amplifier circuit, 44... Band pass filter, 45... AC amplifier circuit, 46... …
A/D converter, 47... Common bus, 48... Central processing unit (CPU), 49... Read only memory (ROM), 50... Random access memory (RAM), 51... Digital input/output circuit,
52... Sequence control device, 53... Judgment display device, 54... Setting device, 55... Digital input/output circuit, 56... Display device.

Claims (1)

[Scope of utility model registration request] A support device that rotatably supports a master gear and a gear to be inspected in a meshed state, and an interaxle for measuring a change in the distance between the axes of the master gear and the gear to be inspected as the master gear and the gear to be inspected mesh with each other. a distance measuring device, a rotation angle detection device for detecting the rotation angle of the gear to be inspected, a first position in contact with the gear to be inspected to measure the temperature of the gear to be inspected, and a position away from the gear to be inspected to maintain room temperature. a temperature measuring device that is movable to a second position for measurement; an inter-axle distance signal generated by the inter-axle distance measuring device; and a temperature signal of the gear to be inspected and a room temperature signal generated by the temperature measuring device; A gear meshing testing device comprising: an arithmetic and control device that calculates a temperature difference between a gear to be inspected and the room temperature and corrects the inter-axle distance signal based on the temperature difference.