JP3005947B2 - Gear inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the degree of runout of tooth flank and tooth groove of a work gear, which is a gear to be inspected.
The present invention relates to a gear inspection device capable of simultaneously measuring a BD (Over Ball Diameter) using a master gear serving as an inspection reference.

[0002]

2. Description of the Related Art Gears are machined by a gear cutting machine.
It is manufactured through shaving with a shaving cutter or the like. However, in these processing steps, an unexpected dent may be formed on the tooth surface, or a tooth gap may run out due to a processing error. In the inspection process, the size of the dents and runout of the tooth surface is measured in the inspection process, and products with dents or runout exceeding the specified values are removed from the line as defective products. ing.

[0003] As another inspection item of the gear, there is another OBD.
(Over Ball Diameter). This relates to the distance between the center of the gear and the tooth surface. For example, for a gear that has not been subjected to shaving, the OBD exceeds the reference value, and it is determined that the gear has not been subjected to shaving.

[0004] As a gear inspection device for measuring the degree of tooth dents and tooth groove runout, a device shown in Fig. 8 has been used conventionally. In this device, a substantially L-shaped rocking lever (4) is installed vertically on a fixed surface plate (14), and the rocking lever (4)
At the center of the bend (4b), place the bolt (3
It is swingably supported by the built-in bearing (30) fixed in 1).

A high-precision master gear (3) serving as an inspection reference is rotatably supported at the tip (4a) of a swing lever (4) extending upward from the bearing (30). The master gear (3) is resiliently meshed with a work gear (1), which is a test gear that is rotatably arranged at a fixed position, by a compression spring (33). The work gear (1) is exchangeably supported by a gear drive mechanism (2) installed on a surface plate (14). The gear drive mechanism (2) includes a loading / unloading mechanism (not shown) for the work gear (1).

At the rear end (4c) of the swing lever (4) extending laterally from the bearing (30), a differential transformer (7) as displacement detection means and a lever urging means (32) are installed. ing. The differential transformer (7) is fixed to the tip of a support arm (36) extending upward from the surface plate (14), and its tracing stylus (7 ') is connected to the rear end ( The vertical displacement of the rear end (4c) when the swing lever (4) swings about the center of the bearing (30) while constantly contacting the upper surface of 4c) is detected by a voltage value. It is configured as follows.

The lever urging means (32) controls the swing of the swing lever (4), and includes a compression spring (33) and an air cylinder (34). The compression spring (33) and the air cylinder (34) are mounted on a support bracket (38) fixed on the surface plate (14) with bolts (37), and the compression spring (33) is a swing lever (4). The rear end (4c) is always elastically pressed upward to engage the master gear (3) with the work gear (1). The air cylinder (34) is connected to the rear end (4) of the swing lever (4). 4c), the piston rod (35) pushes down the rear end (4c) of the swing lever (4) against the compression spring (33) when the air cylinder (34) is operated, and the master gear Separate (3) from the work gear (1). Air cylinder (34) is work gear (1)
When the inspection of the work gear (1) is completed, the piston rod (35) is held at a retracted position separated from the rear end (4c) of the swing lever (4).

[0008] The gear inspection device shown in FIG.
Is inspected as follows. The work gear (1) is set at a fixed position, and the master gear (3) is engaged with the work gear (3).
When the work gear (1) is rotated and the master gear (3) is rotated in a subordinate manner, the swing lever (4) is rotated according to the dents on the tooth surface of the work gear (1) and the degree of tooth groove runout. ) Is slightly displaced about the bearing (30), and the amount of this displacement is detected by the differential transformer (7).

The output of the differential transformer (7) is displayed as a waveform graph, for example, as shown in FIG. Work gear (1)
A portion where the center distance D between the gear and the master gear (3) is larger than the reference is displayed above the reference point, and a small portion is displayed below the reference point. The large swell w of the graph represents the fluctuation of the OBD. The minute wave dx is not abnormal and is caused by the involute surface of the tooth surface. When the master gear (3) meshes with the tooth dent of the work gear (1) and the runout of the tooth space, the swing lever (4) swings greatly, and a projecting wave dx 'appears.

[0010]

With the conventional gear inspection device shown in FIG. 8, it was practically impossible to measure the OBD.
This is because in the inspection of tooth dents and tooth groove runout of the work gear (1), the protruding wave dx 'clearly appears at an abnormal location, so that inspection is relatively easy even if the device is not high precision. On the other hand, in the OBD measurement, since the absolute value of the reference point and the vertical width of the gentle undulation w are measured, the lack of accuracy of the apparatus itself directly affects the error of the measured value. Therefore, in order to perform the OBD measurement of the work gear (1) with high accuracy, it is essential that the rigidity of the device itself is high and the measurement accuracy is stable even after repeated measurements.

However, in the conventional device, as shown in FIG. 8, since the swing lever (4) is supported by the bearing of the bearing (30), it is necessary to avoid relatively large backlash in the bearing (30). Is not possible, and the error is too large, so it is virtually OB
D measurement was not possible.

A bearing (30) mounted on a surface plate (14)
Also, the subtle deviation of the relative positional relationship between the differential transformer (7) and the lever urging means (32) has been a part of the error that makes the OBD measurement impossible.

For this reason, conventionally, the OBD measurement is performed by hand almost one by one in a process different from the inspection of tooth dents and tooth groove runout without using a gear inspection device as shown in FIG. Was.

An object of the present invention is to provide a tooth dent of a work gear,
It is an object of the present invention to provide a gear inspection device that can continuously and automatically inspect tooth groove runout and OBD simultaneously with high accuracy.

[0015]

SUMMARY OF THE INVENTION According to the present invention, a work gear rotatably mounted at a fixed position is rotatably supported at one end of a swinging lever rotatably supported at a substantially central portion by lever support means. The master gear, which is a supported inspection reference, is resiliently meshed with each other, and the work gear tooth surface is determined from the displacement amount of the swing lever that swings according to the displacement of the master gear when the work gear and the master gear are rotated. The above object is achieved by using a pair of pivot hinges which rotatably support two points on both sides of a substantially central portion of a swing lever as the lever support means. .

In order to achieve the above object more effectively, the present invention provides a lever supporting means for supporting a swing lever,
Assemble the gear inspection unit by assembling the components of the displacement detecting means for detecting the displacement amount of the swing lever and the lever urging means for elastically engaging the master gear with the work gear to the mounting bracket, and assembling the gear inspection unit. The bracket is fixed on a surface plate.

[0017]

A pair of pivot hinges rotatably supporting the swing lever supports the swing lever without rattling and accurately following the small swing angle of the swing lever.
Further, the pivot hinge maintains high rigidity and more stably supports the swing lever. As a result, the swing lever accurately swings following the change in the center distance between the work gear and the master gear, thereby enabling high-precision OBD measurement of the work gear together with tooth dents and tooth runout.

Further, a gear inspection unit is constituted by assembling a lever supporting means, a displacement detecting means, and a lever urging means of the swing lever to the mounting bracket, and the gear inspection unit is installed on a surface plate. It is easy to make the relative dimensional positional relationship of the lever support means, the displacement detection means, and the lever urging means highly accurate, so that the OBD measurement of the work gear can be performed with higher precision, and the work gear can be placed on the surface plate The workability of assembling the gear inspection device is improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same or corresponding parts of the gear inspection device shown in the embodiment of FIG. 8 as those of the inspection device of FIG. 8 are denoted by the same reference numerals.

The gear inspection apparatus shown in FIGS. 1 and 2 includes a pair of pivot hinges (5) provided on a lever supporting means (5) for rotatably supporting a bent portion (4b) of an L-shaped rocking lever (4). 6) is used.

As shown in FIG. 3, the gear inspection device includes a swing lever (4) and lever supporting means (5),
Each component of the differential transformer (7), which is the displacement detecting means of the swing lever (4), and the lever biasing means (8), which biases the swing lever (4) and engages the master gear with the work gear elastically And a gear inspection unit (13) assembled to one mounting bracket (12), and this gear inspection unit (1
The feature is that 3) is mounted on the surface plate (14).

More specifically, the mounting bracket (1
2) The horizontal seat plate (12a) fixed to the surface plate (14)
And a pair of vertical walls (12b) erected integrally on the seat plate (12a) and opposed to each other, and a top plate (12c) laid on the upper end of the vertical wall (12b). A mounting hole (16) is formed at an end of the vertical wall (12b), and a hinge fixing body (15) having a pivot hinge (6) protruding from the front surface is fitted into the mounting hole (16).

As shown in FIG. 4, corresponding to the pair of pivot hinges (6) of the lever supporting means (5), conical holes (17) are formed in the center of both side surfaces of the bent portion (4b) of the swing lever (4). ) Is formed. Insert the bent part (4b) of the swing lever (4) between the ends of the pair of vertical walls (12b) of the mounting bracket (12), and insert the hinge fixing body (16) into the mounting hole (16) of the vertical wall (12b). Insert the pivot hinge (6) into the conical hole (17) of the swing lever (4), and the pivot hinge (6) and the conical hole (17) are automatically aligned. The hinge (6) positions and supports the bent portion (4b) of the swing lever (4). In this state, the hinge fixing body (15) is fixed to the vertical wall (12b).

A differential transformer (7) of displacement detecting means is mounted on a part of the vertical wall (12b) of the mounting bracket (12),
The lever urging means (8) is attached to the top plate (12c). The differential transformer (7) is fixed to the vertical wall (12b) such that the tip of the probe (7 ') is always in contact with the upper surface of the rear end (4c) of the swing lever (4).

The lever urging means (8) may have the same configuration as that of the conventional device shown in FIG. 8, but as shown in FIG. 1, one air cylinder (9) and its piston rod (10) are swung. Floating joint (1) connecting lever (4)
With the configuration of 1), the rebound of the swing lever (4) at the time of detecting a tooth dent or the like is prevented, as will be described in detail later. The air cylinder (9) is attached to the mounting bracket (1
The lower end of the piston rod (10) fixed to the top plate (12c) of 2) and extending downward through the top plate (12c) and the rear end (4c) of the swing lever (4) float. They are connected by a joint (11).

The floating joint (11) is shown in FIG.
As shown in FIG. 5, the lower end of the piston rod (10) and the rear end (4c) of the swing lever (4) are connected by a spherical universal joint (18), and as shown in FIG. 4) Prevents excessive force from acting on the piston rod (10) due to the inclination of (4).

The air cylinder (9) exerts two opposing actions of the compression spring (33) and the air cylinder (34) on the swing lever (4) in the conventional device of FIG.

More specifically, a gear inspection unit (13) in which a swing lever (4), lever support means (5), lever urging means (8), and a differential transformer (7) are mounted on a mounting bracket (12). Then, the seat plate (12a) of the mounting bracket (12) is positioned and fixed on the surface plate (14) with bolts (20). The air pressure of the back pressure throttle is supplied to the air cylinder (9), and the rear end (4c) of the swing lever (4) is moved by the piston rod (10) via the floating joint (11).
Urges the upper resilience to the master gear (3)
Is engaged with the work gear (1) at a fixed position by elastic pressure. The elastic force at the time of the engagement corresponds to the elastic force by the compression spring (33) in the inspection device of FIG.

The work gear (1) meshed with the master gear (3) is rotated, and the displacement of the swing lever (4) caused by the displacement of the master gear (3) is detected by the differential transformer (7). When the gear (1) inspection is completed, the air cylinder (9)
Push the piston rod (10) with the swing lever (4)
Lower the rear end (4c). Swing lever (4)
Rotates counterclockwise in FIG. 1, and the master gear (3) moves away from the work gear (1).

The gear inspection device shown in FIG.
Dents on the tooth surface, presence or absence of tooth groove runout, large and small measurement,
OBD measurement can also be performed with high accuracy.

That is, the bending portion (4) of the swing lever (4)
By supporting two points on both sides of b) with the pivot hinge (6) at two points, the rotation center P of the master gear (3) shown in FIG. 2 and the two pivot hinges (6) are arranged in an isosceles triangle. , The rigidity of the rotation center P is maintained at a high level. In addition, since the pivot hinge (6) is pressed against the conical hole (17) of the swing lever (4), there is no play between the two.
The structure follows the small rotation angle of the swing lever (4) accurately. As a result, the mechanical accuracy and rigidity of the gear inspection device mainly including the support mechanism of the swing lever (4) can be increased, and the condition for performing the OBD measurement of the work gear (1) with high accuracy can be satisfied. it can.

Further, the gear inspection unit (13) is assembled by mounting a gear inspection unit (13) in which main components such as a swing lever (4) are attached to a mounting bracket (12) to a surface plate (14). Can be placed in a place away from the surface plate (14) without being disturbed by the surface plate (14), and thus can be performed with good workability. Each component of the lever support means (5), the differential transformer (7), and the lever biasing means (8) can be mounted on the mounting bracket (12) while maintaining their mutual positional accuracy at a high level. Becomes possible and the O of the work gear (1)
It was confirmed that the BD measurement accuracy could be improved.

The mounting of the gear inspection unit (13) manufactured on high precision on the surface plate (14) is described in FIGS.
As shown in (5), the position may be adjusted with a plurality of adjustment screws (21) installed on the surface plate (14). Multiple adjustment screws (2
1) is the seat plate (1) of the mounting bracket (12) on the surface plate (14).
2a) is installed around the platen (14), and the seat plate (12
When a) is placed, the adjustment screws (21) are tightened from all sides of the seat plate (12a) to position and fix the seat plate (12a) on the surface plate (14).

FIG. 6 shows a schematic configuration of the embodiment of FIG. 1 including the gear drive mechanism (2) of the work gear (1), and FIG. 7 shows a schematic diagram of the gear inspection circuit. Referring to FIG. The operation principle of will be described.

Air is supplied from an air source (22) to an air cylinder (9) via an electromagnetic valve (23) to elastically mesh the master gear (3) with the work gear (1). Solenoid valve (2
3) is controlled to open and close by a control signal from the control unit (26). A work gear (1) supported by a bearing (29) is rotated by a motor (27), and a sampling pulse is output to a measuring unit (25) by a rotary encoder (28) every rotation of the work gear (1). The control unit (26) outputs a measurement start command signal to the measurement unit (25), and the measurement unit (25) receives the input from the differential transformer (7) via the amplifier (24) in the center of FIG. The signal corresponding to the change waveform of the distance D is arithmetically processed.

The measuring section (25) includes a rotary encoder (2
With the sampling pulse from 8), the change (wave dx) of the center distance D per pitch rotation of the teeth of the work gear (1) is sampled, stored, compared with the reference level, and compared with the normal wave dx. In the case of an abnormally large protruding wave dx ', it is determined that the work gear (1) has tooth dents and tooth groove runout. At the same time, the measuring unit (25) measures the upper and lower limits of the undulation w with a large center distance D,
It is determined whether or not the BD is within the reference range of plus or minus, and whether the work gear (1) is good or bad is determined from all the inspection results of tooth dents and tooth groove runout.

At the time of the above inspection, at the moment when the tooth with a tooth dent of the work gear (1) meshes with the master gear (3), the swing lever (4) swings greatly, and the protruding wave d shown in FIG.
As shown by x ', the center distance D instantaneously increases. By detecting the magnitude of the projecting wave dx ', the presence or absence and magnitude of tooth dents on the work gear (1) are measured. The large swing of the swing lever (4) is absorbed by the shock absorber effect due to the resistance of the air cylinder (9), and the swing lever (4) returns to the normal swing.

By the way, the rear end (4) of the swing lever (4)
In the case where c) is held elastically only by the compression spring (33) in FIG. 8, since the swing of the swing lever (4) is small and instantaneous, the compression spring ( The shock absorber effect of 33) is thin, and the swing lever (4) may swing unnecessarily large due to inertia. Therefore, the swing of the protruding wave dx ′ indicating the large swing of the center distance D shown in FIG. 9 swings more than necessary, and the actual tooth dents of the teeth of the work gear (1) are minute and within the acceptable range. Even in this case, it may be erroneously determined that the tooth dent is of an unacceptable size.

However, the rear end (4) of the swing lever (4)
If c) is held elastically by the air cylinder (9) instead of the compression spring (33), the inertia of the swing lever (4) during a large swing is effectively absorbed by the air pressure resistance of the air cylinder (9), There is no need to worry about the swing lever (4) swinging unnecessarily large, and the reliability of the inspection is improved.

[0040]

According to the present invention, the pair of pivot hinges rotatably supporting the swing lever can accurately follow the small swing angle of the swing lever without rattling of the swing lever. In addition, in order to support while maintaining high rigidity, the swing lever swings accurately following the fluctuation of the center distance between the work gear and the master gear, and not only inspects the tooth surface dents and tooth groove runout of the work gear, but also , OBD measurement can be performed at the same time with high accuracy, and whether or not the work gear is finished to a predetermined size can be confirmed in the same inspection process.

Further, a gear inspection unit is constructed by assembling the lever supporting means, the displacement detecting means, and the lever urging means of the swinging lever to the mounting bracket, and the gear inspection unit is mounted on the surface plate. The workability of assembling the gear inspection device to the gear is improved, and the relative dimensional positional relationship of the lever support means, displacement detection means, and lever biasing means of the swing lever can be made with high accuracy, and the OBD measurement of the work gear can be performed more easily. It can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a front view including a partial cross section showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a side view of the gear inspection device of FIG. 1 at the time of assembly.

FIG. 4 is an enlarged cross-sectional view of the gear inspection device of FIG.

FIGS. 5A and 5B are partially enlarged front views of the swing lever and the lever urging means in the gear inspection device of FIG. 1, wherein FIG. 5A is a normal view of the swing lever and FIG.

FIG. 6 is a block diagram schematically showing the configuration of the gear inspection device of FIG. 1;

FIG. 7 is a block diagram schematically showing an inspection circuit of the gear inspection device of FIG. 1;

FIG. 8 is a front view of a conventional gear inspection device.

FIG. 9 is a waveform diagram of a change in the center distance between the work gear and the master gear for explaining the gear inspection principle by the gear inspection device of FIG. 8;

[Explanation of symbols]

 1 Work gear 3 Master gear 4 Swing lever 5 Lever support means 6 Pivot hinge 7 Displacement detection means (differential transformer) 8 Lever biasing means 12 Mounting bracket 13 Gear inspection unit 14 Surface plate

Claims (2)

(57) [Claims] A master serving as an inspection reference, which is rotatably supported at one end of a swinging lever rotatably supported by a lever support means at a substantially central portion on a work gear rotatably installed at a fixed position. A device for resiliently meshing gears and inspecting a tooth surface abnormality of a work gear from a displacement amount of a swing lever that swings according to a displacement of the master gear when the work gear and the master gear are rotated, The lever support means is attached to both sides of a substantially central portion of the swing lever.
A gear inspection device comprising a pair of pivot hinges that rotatably support points. 2. A master serving as an inspection reference, which is rotatably supported at one end of a swinging lever rotatably supported by a lever support means at a substantially central portion on a work gear rotatably installed at a fixed position. The amount of displacement of the oscillating lever that oscillates according to the displacement of the master gear when the work gear and the master gear are rotated when the gears are resiliently meshed via lever biasing means attached to the oscillating lever. Is detected by a displacement detecting means, and a tooth surface abnormality of the work gear is inspected from the detected value, a lever supporting means for supporting the swing lever, a displacement detecting means for detecting a displacement amount of the swing lever Each component of the lever urging means for elastically engaging the master gear with the work gear is assembled to a mounting bracket to form a gear inspection unit, and the gear inspection unit is mounted on a surface plate by the mounting bracket. Constant and gear inspection device comprising.