JPH08247784A - Backlash measuring apparatus for gear - Google Patents

Abstract

PURPOSE: To obtain a measuring apparatus having excellent general purposes by so aligning rotation detecting gears with the gear to be measured as not to cause the deviation of the rotation transmission of a backlash and a dead zone by the energizing force from an energizing mechanism. CONSTITUTION: Rotation detecting gears 4a are so aligned with the gear 1a to be measured as not to cause the deviation of the rotation transmission of a backlash and a dead zone by the pressure of an energizing mechanism 7 from the direction of arrow A. That is, they are solidly meshed in the state that there are no backlash on both sides of the gear. Thus, a rotary sensor 2a and the gear 1a to be measured are integrally rotated in the state there are no backlashes. When the gear 1a is forward or reversely rotated in this state, the gear 1a is idled by the backlash of the gear 1a, and then stopped by the gear 1b. The rotary angle until the rotation is stopped is measured by the rotary angle detection signal of the sensor 2a, thereby obtaining the backlash by multiplying it by the radial value of the gear 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear backlash measuring device.

[0002]

2. Description of the Related Art Adjustment of backlash in meshing of gears is an essential work in a device using gears.
In this work, when the gear diameter is large, adjustment and confirmation using a thickness gauge, etc. can be performed, but when the gear diameter is small, it is difficult to measure, and it is difficult to measure it. In some cases, it was not converted.

Therefore, there is a backlash measuring device as disclosed in JP-A-1-165929 or JP-A-5-52705.

The backlash measuring device disclosed in Japanese Unexamined Patent Publication No. 5-52705 discloses that when one of two meshed gears is fixed and the other gear is rotated in both forward and reverse directions, the meshing of the two causes The backlash is measured by measuring the rotation range of the left-right rotation in which the other gear stops.

The backlash measuring device disclosed in Japanese Unexamined Patent Publication No. 1-165929 rotates one of two meshed gears in both forward and reverse directions and measures the rotation delay until the other gear is driven. , To measure backlash.

FIG. 6 is a block diagram showing an outline of an apparatus for fixing 1b of two meshing gears 1a and 1b, rotating 1a left and right, and measuring the rotation of the gear 1a by a rotation sensor 2a. Since the gear 1a idles in the range of backlash with the gear 1b, the idling amount is measured as an angle by the rotation sensor 2a. Then, the backlash of the gears 1a and 1b is obtained by multiplying by the coefficient proportional to the diameter of the gear 1a.

This state is shown in FIG. For example, when the gear 1a is first rotated clockwise (clockwise), the rotation sensor 2a sends an output signal proportional to the rotation angle of the gear 1a. Eventually, the gear 1a hits the gear 1b and becomes immobile, so that the rotation angle does not rise. Next, when the gear 1a is rotated leftward (counterclockwise), the rotation angle decreases,
The rotation angle decreases until the gear 1a hits the gear 1b in the opposite direction. At this time, if the rotation angle is G and the radius of the gear 1a is R, the backlash of the gears 1a and 1b is “G (radian) × R”.

FIG. 8 is a block diagram showing the outline of an apparatus for rotating one of the two gears in both forward and reverse directions and measuring the rotation delay until the other gear is driven. The gear 1a has a rotation sensor 2a, The rotation sensor 2b is attached to the gear 1b. Then, when at least one of the gears 1a and 1b is rotated in the forward and reverse directions, the rotation angle difference between the two is detected.
It is measured by the output signals of a and 2b.

This state is shown in FIG. For example, when the gear 1a is rotated rightward, the gear 1b starts rotating from the point p1 in the middle due to the presence of backlash. Next, after the gear 1b is driven to rotate by the gear 1a, the gear 1a is rotated in the opposite direction. At this time, the gear 1b is stopped until it hits the gear 1a in the direction opposite to the backlash, and is rotated following the point p3. The backlash at this time is G for the dead zone size and R for the radius of the gear 1a.
Then, “G (radian) × R” is obtained.

[0010]

However, in the above-mentioned conventional backlash measuring device, since the rotation sensors 2a and 2b are mounted on the rotary shafts of the gears 1a and 1b, the mounting positions of the gears 1a and 1b are set. If the rotation sensors 2a, 2b cannot be attached to the rotation shafts of the gears 1a, 1b due to reasons such as the above, backlash cannot be measured, and the rotation shaft of the gear to be measured is limited to the structure exposed to the outside. There is a problem of poor sex.

An object of the present invention is to provide a gear backlash measuring device having excellent versatility.

[0012]

In order to achieve the above object, the present invention provides a rotation detecting gear that meshes with one gear of two gears that mesh with each other, and this rotation detecting gear with respect to the one gear. After providing a biasing mechanism that biases in a state without backlash, a rotation sensor is attached to the rotation shaft of the rotation detection gear, and one gear is rotated in the forward and reverse directions with the other gear fixed. The rotation angle until the rotation is stopped by the other gear is measured by a rotation sensor, and the backlash is obtained from the rotation angle.

Further, there are provided two rotation detecting gears respectively meshing with both gears of the two meshed gears, and an urging mechanism for urging the rotation detecting gears against the corresponding gears so that there is no backlash between them. After providing the rotation sensor, the rotation sensor is attached to the rotation shaft of each rotation detection gear, one gear is rotated in the forward and reverse directions, and the rotation delay angle when the other gear is driven to rotate by the rotation is detected by the two rotation sensors. It is characterized in that the backlash is calculated by the rotation angle detection signal and the rotation delay angle.

[0014]

According to the above-mentioned means, the rotation detecting gear is aligned with the gear to be measured so that the bias of the biasing mechanism does not cause a shift in rotation transmission such as backlash or a dead zone. As a result, the rotation sensor and the gear to be measured are in a state of rotating together without backlash. When the gear to be measured is rotated in the forward and reverse directions in this state, both gears are displaced by the amount of backlash. By detecting this with a rotation sensor, the backlash of both gears can be measured.

Therefore, even if the gear to be measured is in the mounted state or the assembled state such that the rotary shaft of the gear is not exposed, if the radial direction of the gear to be measured can be opened, the rotation detection gear is to be measured. The backlash can be measured by meshing with the gears of.

In this case, as the urging mechanism, a spring for urging the rotation detecting gear in the axial direction of the gear to be measured, a motor for giving a rotational torque in the rotating direction, or the like can be used. When the gear to be measured is urged in the axial direction, the rotation detection gear and the gear to be measured mesh with each other without backlash on both sides of the tooth.

Further, when a rotational torque in the rotational direction is applied, the rotation detection gear and the gear to be measured mesh with each other in the backlash on both sides of the tooth without any backlash. Even if the gear to be measured is rotated to the right or left, the rotation detection gear rotates without this backlash.

[0018]

The present invention will be described below based on illustrated embodiments.

FIG. 1 is a block diagram showing the first embodiment of the present invention.

The backlash measuring device of this embodiment is
A biasing mechanism including a rotation detection gear 4a that meshes with one gear 1a of the two gears 1a and 1b that mesh with each other, and a spring that biases the rotation detection gear 4a in the axial direction of the one gear 1a (direction of arrow A in the figure). 7 and the rotation sensor 2a is attached to the rotation shaft of the rotation detection gear 4a, and the gear 1b
With one fixed gear, one gear 1a is rotated in the forward and reverse directions, the rotation angle until the rotation is stopped by the other gear 1b is measured by the rotation sensor 2a, and the backlash is obtained by the rotation angle. It is the one.

The gear 1a is adapted to rotate by connecting the rotation shaft of the motor to the rotation shaft of the gear 1a.

According to this structure, the rotation detecting gear 4a is directed to the gear 1a to be measured from the urging mechanism 7 by the arrow A shown in the figure.
Due to the pressing force in the direction, the alignment is performed so that the rotation transmission shift such as backlash and the dead zone do not occur. That is, the teeth are firmly meshed with each other without backlash on both sides. As a result, the rotation sensor 2a and the gear 1a to be measured are in a state of integrally rotating without backlash.

When the gear 1a is rotated in the forward and reverse directions in this state, both gears 1a run idle by the amount of backlash with the gear 1b, and then the rotation is stopped by the gear 1b. The rotation sensor 2 measures the rotation angle until this rotation is stopped.
The backlash is obtained by measuring the rotation angle detection signal of a and multiplying it by the radius value of the rotation detection gear 4a.

Therefore, even if the gear 1a to be measured is in the mounted state or the assembled state in which the rotation shaft of the gear 1a is not exposed, if the radial direction of the gear to be measured can be opened, the rotation detection gear 4a is used. The backlash can be measured by meshing with the gear 1a to be measured.

FIG. 2 is a block diagram showing the first embodiment of the present invention.

The backlash measuring device of this embodiment is
Two rotation detection gears 4a and 4b that mesh with both gears 1a and 1b that mesh with each other, and these rotation detection gears 4a and 4b are attached in the axial direction of the corresponding gears 1a and 1b (arrows A and B in the drawing). A biasing mechanism 7a, 7b including a biasing spring is provided, and each rotation detection gear 4a,
The rotation sensors 2a and 2b are attached to the rotation shaft of 4b, respectively, one gear 1a is rotated in the forward and reverse directions, and the rotation delay angle when the other gear 1b is driven to rotate by the rotation is measured by the two rotation sensors 2a and 2b. Is measured by the rotation angle detection signal, and the backlash is obtained by multiplying the rotation delay angle by the radius value of the rotation detection gear 4a.

The gear 1a is adapted to rotate by connecting the rotation shaft of the motor to the rotation shaft of the gear 1a.

In this structure, the rotation detection gears 4a,
4b is a biasing mechanism 7 for the gears 1a and 1b to be measured.
Due to the pressing force from the a and 7b in the directions of the arrows A and B in the drawing, alignment is performed so as not to cause a shift in rotation transmission such as backlash and a dead zone. As a result, the rotation sensors 2a and 2b and the gears 1a and 1b to be measured are in a state in which they rotate together as a unit without backlash.

When the gear 1a is rotated in the forward and reverse directions in this state, the gear 1b rotates with a delay corresponding to the backlash with the gear 1a. The rotation delay angle at the time of this driven rotation is measured by the rotation angle detection signals of the two rotation sensors 2a and 2b, and the backlash is obtained by multiplying the rotation delay angle by the radius value of the rotation detection gear 4a.

As a result, the same effect as that of the embodiment shown in FIG. 1 can be obtained.

FIG. 3 is a block diagram showing a third embodiment of the present invention. In this embodiment, a rotational torque from a motor is used instead of a spring to apply a pressing force in the rotational direction to a rotation detecting gear. It is the one.

That is, a motor 3a which gives a torque in the direction of rotation is added to eliminate backlash between the gears 1a and 1b and the rotation detecting gear 4a, and the motor 3a is rotated via a gear 8a attached to the rotary shaft of the motor 3a. Directional torque is applied to the rotation detection gear 4a.

An auxiliary gear 5a is interposed between the rotation detecting gear 4a and the gears 1a and 1b in consideration of ease of mounting as a measuring device. By interposing this auxiliary gear 5a, there are advantages that the mounting ease as a measuring device is improved, and the gear shapes of the gears 1a and 1b and the rotation detection gear 4a can be set independently. In this case, the gear 1a,
When the tooth profile of the rotation detection gear 4a is different from that of the rotation detection gear 4a, the auxiliary gear 5a has two tooth profiles prepared so as to have a two-layered shape.

That is, the shape of the gears 1a and 1b is formed in the portion meshing with the gears 1a and 1b, and the two gears corresponding to the shape are stacked in the portion meshing with the rotation detecting gear 4a. Thereby, when the gears 1a and 1b having different shapes are measured, it is not necessary to change the gear shape of the entire backlash measuring device.

In this embodiment, by applying a torque in the rotation direction to the rotation detecting gear 4a, backlash on one side of the tooth is prevented between the rotation detecting gear 4a and the auxiliary gear 5a and between the auxiliary gear 5a and the gear 1a. It will be kept in a non-existent state.

Even with such a structure, the backlash of the gears 1a and 1b can be measured in the same manner as the embodiment of FIG.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention. As in the embodiment of FIG. 3, the rotational force from the motor is used instead of the spring to rotate the pressing force in the rotational direction to detect the rotation detection gear. It was designed to be given to.

That is, in order to eliminate backlash between the gears 1a, 1b and the rotation detection gears 4a, 4b, motors 3a, 3b which give torque in the rotational direction are added and attached to the rotary shafts of the motors 3a, 3b. Torque in the rotational direction is applied to the rotation detection gears 4a and 4b via the gears 8a and 8b.

Incidentally, auxiliary gears 5a and 5b are interposed between the rotation detecting gears 4a and 4b and the gears 1a and 1b in consideration of ease of mounting as a measuring device.

Even with such a structure, the backlash of the gears 1a and 1b can be measured in the same manner as the embodiment of FIG. Further, when the gears 1a and 1b having different shapes are measured, it is not necessary to change the gear shape of the entire backlash measuring device.

FIG. 5 is a block diagram showing the configuration of the entire apparatus including the portion for calculating and displaying the backlash in contrast to the configuration of FIG. 3, and the rotation sensor 2a and the rotation detection gear 4
a, the auxiliary gear 5a, and the motor 3a include a frame 9 and a gear 8
The a, 4a, and 5a are attached in a meshed state. In the frame 9, the auxiliary gear 5a has the gears 1a, 1
It is fixed by the mounting hole 10 so as to mesh with b.

On the electric circuit side of the backlash measuring device, a rotation detecting circuit 1 for detecting the rotation angle of the rotation sensor 2a.
1. An arithmetic control circuit 12 for calculating backlash from the output signal and displaying it on the display circuit 13, a motor drive circuit 14 for driving the motor 3a and a power supply 15 are provided, and the backlash is calculated from the output signal of the rotation sensor 2a. Is calculated and displayed on the display circuit 13 as a numerical value.

Here, as the rotation sensor 2a, for example, a rotary encoder or a potentiometer is used. The control circuit 12 is a one-chip CPU
And so on.

By making the part having such a structure (the part within the broken line in FIG. 5) into a unit, it becomes possible to easily use it as a backlash measuring device having excellent portability and versatility. .

When the backlash is measured with the mechanism structure shown in FIG. 4, two sets of frames 9 shown in FIG. 5 are prepared and these are meshed with the gears 1a and 1b to be measured.

[0046]

As described above, according to the present invention,
After providing a rotation detection gear that meshes with at least one of the measurement target gears and a biasing mechanism that biases the rotation detection gear to the measurement target gear in a state where there is no backlash between them, the measurement target gear Since the idling amount or the rotation angle delay is determined by the output signal of the rotation sensor attached to the rotation shaft of the rotation detecting gear, the gear backlash measuring device having excellent versatility can be obtained.

By interposing an auxiliary gear,
The gear shape as the measuring device and the gear shape of the system under measurement can be separated, and the handling as the measuring device is further improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing an example of a conventional device.

7 is a rotation sensor output waveform diagram for explaining the operation of the conventional apparatus of FIG.

FIG. 8 is a configuration diagram showing another example of a conventional device.

9 is a rotation sensor output waveform diagram for explaining the operation of the conventional apparatus of FIG.

[Explanation of symbols]

1a, 1b ... Gear to be measured, 2a, 2b ... Rotation sensor, 3a, 3b ... Motor, 4a, 4b ... Rotation detection gear,
5a, 5b ... Auxiliary gears, 7 ... Energizing mechanism, 11 ... Rotation detecting circuit, 12 ... Arithmetic control circuit, 14 ... Motor drive circuit, 1
3 ... Display circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadayuki Goto 1 Ikegami, Haruoka-cho, Owariasahi-shi, Aichi Hitachi Ltd. Office Systems Division

Claims (3)

[Claims] 1. A rotation detection gear that meshes with one of two meshed gears, an urging mechanism that urges the rotation detection gear against the one gear so that there is no backlash between the rotation detection gear and the rotation gear. A rotation sensor attached to the rotation shaft of the detection gear; and a drive source for rotating one gear in the forward and reverse directions with the other gear fixed among the two gears,
An arithmetic control means for detecting a rotation angle until the rotation of one gear is stopped by the other gear by an output signal of the rotation sensor, and calculating a backlash of two gears meshed with each other by the rotation angle. Characteristic gear backlash measuring device. 2. A rotation detecting gear that meshes with both gears of two meshed gears, and a biasing mechanism that biases the rotation detecting gear against a corresponding gear so that there is no backlash between the gears. A rotation sensor attached to each rotation shaft of each rotation detection gear, a drive source for rotating one of the two gears in the forward and reverse directions, and a rotation source of one gear when the other gear is driven to rotate. A backlash measuring device for a gear, comprising: a rotation delay angle detected by a rotation angle detection signal of two rotation sensors; and a calculation control means for obtaining a backlash based on the rotation delay angle. 3. The gear backlash measuring device according to claim 1, further comprising an auxiliary gear interposed between the two meshed gears and the rotation detection gear.