JP2000321172A - Gear inspection equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily judge the operating defect of a subgear. SOLUTION: In this apparatus as an inspection apparatus for a gear, a subgear 4 which is overlapped in the circumferential direction of a main gear 2 by keeping a phase difference is provided, and the operation of the subgear 4 is inspected with reference to a gear 1, to be inspected, which is provided with a spring 8 used to urge the subgear 4 to a direction in which the tooth groove of the main gear 2 is narrowed. At this time, a holding means 15 which is provided with a positioning means 17 used to position the main gear 2 and which holds the subgear 4 so as to be freely rotatable is installed. An inspection gear 35 which is shaft-supported by a freely movable pedestal so as to be freely rotatable is installed. A rotation means 36 which turns the inspection gear 35 at a prescribed torque when the inspection gear 35 is engaged with the subgear 4 is installed. A subgear-angle-of-rotation detection means 37 which detects the angle of rotation of the subgear 4 to be turned at a prescribed torque is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear inspection apparatus, and more particularly, to a gear inspection apparatus for inspecting the operation of a sub gear, which is provided with a sub gear for eliminating backlash of a main gear. About.

[0002]

2. Description of the Related Art For example, in a cam gear or the like provided for transmitting rotation of a crankshaft of an engine to a camshaft, a so-called no gear is constructed so as to eliminate play between tooth surfaces when a pair of gears are engaged. It is known that a backlash gear is employed. Generally, in this type of no backlash gear, a main gear and a sub gear having substantially the same shape as the main gear are superimposed on each other, and the sub gear is rotatably mounted on the main gear with a phase difference with respect to the main gear. ing. A spring that urges the sub gear in a direction to narrow the tooth groove of the main gear is housed between the main gear and the sub gear. When this type of no-backlash gear meshes with another gear, the tooth surface of the auxiliary gear is provided with the spring corresponding to the backlash between the tooth surface of the main gear and the tooth surface of the other gear. Since the gears resiliently come into contact with the tooth surfaces of the other gears, meshing with no backlash is possible.

[0003] In this kind of no-backlash gear, the main gear, the sub-gear, the spring, and other components have processing defects, and foreign matter is inadvertently interposed between the main and sub-gears. In such a case, smooth operation of the auxiliary gear cannot be obtained, and smooth meshing with other gears and transmission of power may be hindered. Further, when the spring is not properly assembled, a sufficient urging force cannot be applied to the auxiliary gear, and the contact of the tooth surface of the auxiliary gear with the tooth surface of another gear can be maintained. There is a possibility that the backlash cannot be eliminated without using it.

[0004] Therefore, there has been a demand for an inspection apparatus which can easily inspect the normal operation of the auxiliary gear with respect to this kind of no-backlash gear.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention makes it possible to easily inspect the normal operation of the sub-gear, and to comprehensively check the processing failure and assembly failure of the gear components. An object of the present invention is to provide a gear inspection device capable of determining the gear.

[0006]

In order to achieve the above object, the present invention is directed to a main gear, which is pivotally supported by a boss of the main gear and has a phase difference in the circumferential direction of the main gear. A gear inspection device for inspecting the operation of the sub gear, for a test gear including a superimposed sub gear and a spring for urging the sub gear in a direction to narrow the tooth space of the main gear, Holding means for positioning the main gear of the gear to be inspected, the holding means rotatably holding the auxiliary gear of the gear to be inspected, and a pedestal movable toward the gear to be inspected held by the holding means The inspection gear is rotatably supported on the inspection gear and meshes with the auxiliary gear when the pedestal moves toward the inspection gear. The inspection gear is moved to the inspection gear by moving the pedestal. Transfer means for meshing, Rotating means for rotating the inspection gear meshed with the spring with a predetermined torque in a direction opposite to the bias of the spring, and a sub-detector for detecting a rotation angle of the auxiliary gear via the inspection gear rotated by the rotating means. Gear rotation angle detecting means.

When inspecting a gear to be inspected according to the present invention, first, the gear to be inspected is held by the holding means. The main gear of the inspected gear held by the holding means is positioned by positioning means provided on the holding means.

Next, the pedestal is moved by the transfer means in a direction toward the gear to be inspected, and the inspection gear is meshed with the auxiliary gear of the gear to be inspected. Subsequently, the inspection gear is rotated at a predetermined torque by the rotating means. This allows
The auxiliary gear meshed with the inspection gear is rotated in a direction opposing the bias of the spring, and the rotation angle of the auxiliary gear is detected by the auxiliary gear rotation angle detecting means. Since the inspection gear is rotated at a predetermined torque by the rotation means,
The torque value at this time can be used as the operating torque of the auxiliary gear, and the rotation angle of the auxiliary gear according to the operating torque can be confirmed. Thus, if the rotation angle of the auxiliary gear at the operating torque falls within a predetermined range (permissible range), it can be determined that the operation of the auxiliary gear is normal.

That is, when the rotation gear rotates the auxiliary gear via the inspection gear and the rotation angle of the auxiliary gear is larger than a predetermined range, the spring is sufficiently energized. Since it is in a state where it is not set, there may be a case where the spring is improperly assembled, a case where the spring is cracked or cut, etc., and it is possible to reliably determine a malfunction of the auxiliary gear. . If the rotation angle of the auxiliary gear is smaller than the predetermined range, the rotation of the auxiliary gear with respect to the main gear cannot be performed smoothly. It is conceivable that the vehicle is intervened, and the malfunction of the auxiliary gear can be reliably determined.

In the present invention, a main gear rotation angle detecting means for detecting a rotation angle of the main gear positioned by the holding means is provided prior to the engagement between the inspection gear and the auxiliary gear. The sub-gear rotation angle detection means corrects and detects the rotation angle of the sub-gear according to the rotation angle of the main gear detected by the main gear rotation angle detection means.

For example, when rattling occurs between the positioning means and the main gear when the inspection gear is held by the holding means, the main gear can be rotated even at a slight angle. Is done. In this state, when the inspection gear is rotated by the rotating means, the main gear also rotates following the auxiliary gear meshing with the inspection gear. This is because the test gear has the main gear and the sub gear connected via a spring.

On the other hand, the auxiliary gear rotation angle detecting means detects the rotation angle of the auxiliary gear via the inspection gear. However, when detecting the rotation angle of the sub gear, if the main gear is rotated due to the above-mentioned rattling, the rotation angle detected by the sub gear rotation angle detecting means is changed to the rotation angle of the main gear (the rattling angle). And the rotation angle of only the auxiliary gear may not be detected.

Therefore, in the present invention, the rotation angle of the main gear is detected in advance by the main gear rotation angle detecting means. When the rotation angle of the auxiliary gear is detected by the auxiliary gear rotation angle detecting means, a correction is made according to the rotation angle of the main gear detected by the main gear rotation angle detecting means. That is, the rotation angle of the main gear detected by the main gear rotation angle detection means is removed from the rotation angle of the inspection gear detected by the auxiliary gear rotation angle detection means. By doing so, even if the positioned main gear is rattled, the rotation angle of only the sub gear can be accurately detected, and the inspection of the inspected gear can be performed with high accuracy.

[0014]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory side view showing a main part of the inspection apparatus of the present embodiment in cross section, FIG. 2 is an explanatory plan view showing an essential part of the inspection apparatus of the present embodiment in an exposed manner, and FIG. FIG. 4 is an exploded perspective view showing a configuration of a gear to be inspected in this embodiment, and FIG. 5 is an explanatory diagram showing a gear to be inspected with a part cut away. FIG. 6 is a diagram showing inspection contents by the inspection device of the present embodiment.

First, the gear 1 to be inspected in the present embodiment will be described with reference to FIGS. The gear 1 to be inspected in the present embodiment is a so-called no backlash gear employed for a cam gear or the like provided when transmitting the rotation of the crankshaft of the engine to the camshaft.

As shown in FIGS. 4 and 5, the gear 1 to be inspected includes a main gear 2 and a sub gear 4 rotatably supported by a boss 3 of the main gear 2. The auxiliary gear 4 is supported by the boss 3 of the main gear 2 via a circlip 5 so as not to come off. A disc spring 6 is provided between the circlip 5 and the sub gear 4, whereby the sub gear 4 is supported by the main gear 2 in a state where friction is applied. The auxiliary gear 4 has the same shape as the main gear 2 and has a smaller thickness (tooth width) than the main gear 2, and is superimposed on the main gear 2 with a phase difference in the circumferential direction of the main gear 2. Have been.

An annular concave portion 7 is formed in the main gear 2, and a substantially C-shaped spring 8 is housed inside the concave portion 7. One end 8a of the spring 8 is connected and supported by a first pin 9 projecting into the recess 7 of the main gear 2, and the other end 8b is connected and supported by a second pin 10 provided on the auxiliary gear 4. Have been. The first pin 9 is movably inserted into a long guide hole 11 formed in the sub gear 4, and the second pin 10 is a long guide guide formed in the main gear 2. It is movably inserted into the hole 12. The biasing force of the spring 8 acts in a direction in which the one end 8a and the other end 8b approach each other. The auxiliary gear 4 is urged by the spring 8 in a direction to narrow the tooth groove 13 (shown in FIG. 5) of the main gear 2.

Next, the inspection apparatus 14 of the present embodiment will be described with reference to FIGS. As shown in FIGS. 1 and 2, the inspection device 14 of the present embodiment includes a holding unit 15 for holding the inspection target gear 1 and an operation of the auxiliary gear 4 of the inspection target gear 1 held by the holding unit 15. And a device main body 16 for inspecting the device.

The holding means 15 comprises a positioning means 17 for positioning the main gear 2 of the gear 1 to be inspected, and a clamping means 18 for clamping and fixing the main gear 2 positioned by the positioning means 17. I have.
As shown in FIGS. 1 and 3, the positioning means 17 includes a fixed shaft 20 provided at an upper end portion of a column 19 and a pair of built-in columns 19 provided on both sides of the fixed shaft 20 so as to be freely protruded and retracted. And a positioning pin 21. Fixed shaft 2
Numeral 0 denotes the gear to be inspected 1 inserted into the shaft hole 22 of the main gear 2 to support the main gear 2. The positioning pin 21 is urged in a protruding direction by a spring 23 built in the column 19, and is inserted into a positioning hole 24 formed in the main gear 2 supported on the fixed shaft 20. The positioning pin 21
Engages with the positioning holes 24 formed in the main gear 2, the main gear 2 is stopped and positioned.

The clamp means 18 includes an arm 26 which is swung by a tilting operation of a lever 25,
And a pressing member 27 provided at the distal end of the main body. The pressing member 27 presses the boss 3 of the main gear 2 by the tilting operation of the lever 26, and fixes only the main gear 2 on the support 19 of the positioning means 17 without preventing the rotation of the sub gear 4.

As shown in FIG. 1, the apparatus main body 16 includes a rail 28 extending toward the positioning means 17,
A pedestal 29 slidably provided along the rail 28
And a transfer means 30 for transferring the pedestal 29 along the rail 28. The pedestal 29 is mounted on the bearing frame 31.
A rotating shaft 33 rotatably supported via a bearing 32, an inspection gear 35 fixed to a rotating disk 34 provided integrally with the rotating shaft 33, and And a rotating means 36 for rotating the inspection gear 35 via the rotating shaft 33. The pedestal 29 further includes a rotation restricting rotation of the auxiliary gear rotation angle detecting means 37 and the inspection gear 35, as shown in FIG. A regulation frame 38 is provided.

The transfer means 30 is, as shown in FIG.
Ball screw 40 screwed and supported by support frame 39
And the tip of the ball screw 40 is connected to the bearing frame 3
The ball screw 40 is rotatably connected to a knob 41 at the rear end thereof. Further, the support frame 39 is provided with a biasing rod 42 extending parallel to the ball screw 40. The urging rod 42
Is connected at its front end to the bearing frame 31 and is provided with a spring member 43 provided at its rear end.
The pedestal 29 is urged in the direction of the positioning means 17 via. The transfer means 30 can transfer the pedestal 29 via the bearing frame 31 by rotating the knob 41 to rotate the ball screw 40 in a desired direction. As will be described later in detail, when the pedestal 29 is moved in a direction approaching the positioning means 17 by the operation of the transfer means 30, the inspection gear 3 is moved.
5 meshes with the auxiliary gear 4 of the inspection gear 1. In the present embodiment, the ball screw 40 for transferring the pedestal 29 by a rotating operation is employed. However, the present invention is not limited to this. Etc. may be provided.

The rotating means 36, as shown in FIG.
It comprises a support frame 44 erected on the pedestal 29, a motor 45 supported by the support frame 44, and a torque meter 47 provided on a rotating shaft 46 of the motor 45. The torque of the rotational character of the inspection gear 35 can be confirmed by the torque meter 47, and the inspection gear 35 can be rotated with a predetermined torque. The inspection gear 35 can be rotated only within a predetermined angle range by the rotation regulating piece 38 shown in FIG.

The sub-gear rotation angle detecting means 37 is provided as shown in FIG.
As shown in FIG. 7, a rotation angle detection rod 48 is provided, and the rotation angle of the inspection gear 35 is detected based on the amount of movement of the rotation angle detection rod 48 in the forward and backward directions. That is, the tip of the rotation angle detection rod 48 abuts on a detection pad 49 fixed to the inspection gear 35, and the detection pad 49 presses the rotation angle detection rod 48 in accordance with the rotation of the inspection gear 35. As a result, the rotation angle detection rod 48 is retracted. The rotation angle of the inspection gear 35 is detected from the amount of retreat of the rotation angle detection rod 48 at this time.

As shown in FIG. 2, a main gear rotation angle detecting means 50 is provided at a position lateral to the clamp means 18. The main gear rotation angle detection means 50 detects, as a rotation angle, the phase of the teeth of the main gear 2 positioned by the positioning means 17 due to rattling.

When inspecting the operation of the sub gear 4 of the gear 1 to be inspected by the inspection device 14 having the above configuration, first, as shown in FIG. 2 and the main gear 2 is fixed by the clamping means 18. At this time, as shown by a virtual line in FIG. 1, the pedestal 29 is at the rear end position of the rail 28, and the inspection gear 35 is separated from the inspection gear 1 positioned by the positioning means 17. .

Next, as shown in FIG. 2, the rotation angle of the main gear 2 positioned by the positioning means 17 is detected by the main gear rotation angle detecting means 50.

Subsequently, as shown in FIG. 1, the inspection gear 35 is meshed with the auxiliary gear 4 of the inspected gear 1 by operating the ball screw 40 of the transfer means 30. Then, the inspection gear 35 is rotated by the rotation means 36 at a predetermined torque. At this time, the rotation direction of the inspection gear 35 is set to a direction opposite to the biasing direction of the sub gear 4 by the spring 8. The auxiliary gear 4 rotates following the rotation of the inspection gear 35,
At the same time, the rotation angle of the inspection gear 35 is detected by the auxiliary gear rotation angle detecting means 37 shown in FIG. Since the inspection gear 35 and the auxiliary gear 4 are in mesh with each other, the rotation angle of the inspection gear 35 is the rotation angle of the auxiliary gear 4. At this time, the rotation angle of the main gear due to rattling detected by the main gear rotation angle detection means 50 is excluded from the rotation angle of the sub gear 4 detected by the sub gear rotation angle detection means 37, An accurate rotation angle of only the sub gear 4 when rotating at a predetermined torque can be obtained.

Then, by confirming the torque and the rotation angle of the sub gear 4, as shown in FIG.
If the rotation angle is within a predetermined range (allowable range) indicated by hatching in the figure, it can be determined that the operation of the auxiliary gear 4 is normal. That is, as shown in FIG.
The maximum allowable value H and the minimum allowable value L of the urging force are determined in advance,
The torque of the sub gear 4 is increased to check the displacement of the rotation angle of the sub gear 4. In FIG. 6, the displacement angle a is an angle from which errors (variations in the guide holes 11 and 12, the distance between the shafts and the diameter) are eliminated, and the displacement angle b is a phase difference 0 between the main gear 2 and the sub gear 4.
(When the main gear 2 and the sub gear 4 overlap),
The displacement angle c is the upper limit of the allowable rotation angle. The median value of the torque (kgfm) at the displacement angle b is 2 kgfm. If the rotation angle of the sub gear 4 is not within the predetermined range, for example, the connection (assembly) of the spring 8 with the first pin 9 or the second pin 10 shown in FIG. Guide hole 12 for main gear 2 and guide hole 11 for sub gear 4
Since it is conceivable that foreign matter is clogged, the malfunction of the auxiliary gear 4 can be easily confirmed.

[Brief description of the drawings]

FIG. 1 is an explanatory side view in which a main part of an inspection apparatus according to an embodiment of the present invention is viewed in cross section.

FIG. 2 is an explanatory plan view showing a main part of the inspection apparatus according to the embodiment in an exposed manner.

FIG. 3 is a partially cutaway view of the positioning means, as indicated by the arrow III in FIG. 1;

FIG. 4 is an explanatory perspective view showing an exploded configuration of a gear to be inspected in the embodiment.

FIG. 5 is an explanatory view showing a gear to be inspected in the embodiment with a part cut away.

FIG. 6 is a diagram showing inspection contents by the inspection device of the embodiment.

[Explanation of symbols]

1 ... gear to be inspected, 2 ... main gear, 3 ... boss, 4 ... auxiliary gear,
8 spring, 14 gear inspection device, 15 holding means, 17 positioning means, 29 pedestal, 30 transfer means, 35 inspection gear, 36 rotation means, 37 auxiliary gear rotation angle detection means, 50 ... Main gear rotation angle detecting means.

Claims (2)

[Claims] 1. A main gear, which is pivotally supported by a boss of the main gear,
For a gear to be inspected including a sub gear superimposed on the main gear with a phase difference in a circumferential direction of the main gear, and a spring for urging the sub gear in a direction to narrow the tooth space of the main gear,
A gear inspection device for inspecting the operation of the auxiliary gear, comprising: positioning means for positioning a main gear of the gear to be inspected, and holding means for rotatably holding the auxiliary gear of the gear to be inspected; An inspection gear rotatably supported by a pedestal movable toward the inspected gear held by the means, and meshing with the auxiliary gear when the pedestal moves toward the inspected gear; and moving the pedestal. Transport means for meshing the inspection gear with the auxiliary gear of the gear to be inspected, and rotating means for rotating the inspection gear meshed with the auxiliary gear with a predetermined torque in a direction opposing the bias of the spring. And a sub-gear rotation angle detection unit for detecting a rotation angle of the sub-gear via the inspection gear rotated by the rotation unit. 2. A main gear rotation angle detecting means for detecting a rotation angle of the main gear positioned by the holding means, prior to the engagement between the inspection gear and the sub gear, 2. The gear inspection according to claim 1, wherein the angle detection means corrects and detects the rotation angle of the sub gear according to the rotation angle of the main gear detected by the main gear rotation angle detection means. apparatus.