JPS6159845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear grinding device in which a gear grinding wheel that rotates at a constant speed can grind a gear to be ground that rotates synchronously with the grindstone.

Generally, in a gear grinding device, the gear grinding wheel is rotationally driven by an electric motor for rotating the grinding wheel, and the gear to be ground is rotationally driven by the electric motor for rotating the gear to be ground, but at this time, the grinding wheel and the gear to be ground are must be rotated synchronously in a mutually meshed state while maintaining consistent rotational phases. However, in the past, the work of aligning the rotational phases of the grinding wheel and the gear to be ground before starting grinding was
For example, as shown in Japanese Patent Publication No. 32-1899, grinding was performed with the grinding wheel stopped, so when grinding a large number of gears in sequence, it was necessary to repeatedly stop and start the grinding wheel, which has a large inertial mass. can be,
This has the disadvantage of increasing the burden on the rotation support shaft of the grindstone and the driving electric motor.

In order to solve this problem, a method has already been proposed in which the rotational phases of the grinding wheel and the gear to be ground are matched in the rotating state of the grinding wheel, as shown in, for example, Japanese Patent Laid-Open No. 54-61394. , the grinding wheel and the gear to be ground are rotated synchronously, detecting the rotational phase shift between the two, and depending on the detected amount, the grinding wheel or the gear to be ground is rotated in the axial direction of the grinding wheel (the tangent of the gear to be ground). direction) to correct the rotational phase shift, the correction changes the contact surface of the grinding wheel against the gear to be ground, which causes uneven wear on the grinding wheel. There is a risk of reducing the machining accuracy of the gear to be ground. That is, the machined surface of the grindstone cannot be freely selected in order to prevent uneven wear.

An object of the present invention is to provide a gear grinding device with a simple structure that can eliminate all the drawbacks of the conventional devices described above, and its features include: a grindstone rotation mechanism for rotating a gear grinding wheel at a constant speed; a synchronous rotating shaft whose speed is adjusted to rotate at a rotational speed equal to the synchronous rotational speed of the gear to be ground to be ground by the grindstone; a gear-to-be-ground shaft holding shaft for holding and rotating the gear to be ground in the grinding device; and; a first power transmission mechanism for transmitting the rotation of the synchronous rotating shaft to the gear holding shaft to be ground without changing speed;
a second power transmission mechanism in a parallel relationship with the first power transmission mechanism for changing the speed of the rotation of the synchronous rotating shaft and transmitting it to the ground gear holding shaft;
Before the start of grinding, the first power transmission mechanism is turned off and the second power transmission mechanism is turned into a power transmission state, and when the rotational phase of the gear to be ground matches the rotational phase of the grindstone, Immediately the first
to put the power transmission mechanism in the power transmission state and put the second power transmission mechanism in the cutoff state,
and a control device for controlling the operation of the first power transmission mechanism and the second power transmission mechanism.

An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1, a grindstone rotation mechanism A is mounted on a grindstone base 1, and the rotational driving force of a grindstone rotation electric motor 2 is transmitted to a horizontal grindstone support shaft 4 via a gear group 3. Ru. This grindstone support shaft 4
On top is a gear grinding wheel 5 having a screw-like outer shape.
is supported so as to be able to rotate integrally with the grindstone support shaft 4 around its center line, and a phase detection simulated grindstone 6 for detecting the rotational phase of the grindstone 5.
is also supported so as to be able to rotate integrally with the grindstone support shaft 4. A phase detector 7 is disposed near the simulated grindstone 6, and this phase detector 7
is moved in the direction of the grindstone support shaft 4 by the operation of the position adjustment electric motor 8, and can maintain an optimum position with respect to the simulated grindstone 6.

On the other hand, the base 9 for the gear to be ground includes an electric motor 10 for rotating the gear to be ground, a drive gear group 11 driven by this motor 10, and a rotation of the gear to be ground according to a change in the number of teeth of the gear to be ground. A gear group 12 for indexing the number of teeth necessary for adjusting the number of teeth, a differential gear group 13 necessary for processing a helical gear as a gear to be ground, and each of these known gear groups 11 and 12. ,13
, the grinding wheel 5 is adjusted according to the number of teeth of the gear to be ground.
A differential device 15 based on the present invention operates using a synchronous rotating shaft 14 that is synchronously driven as an input shaft.
It is equipped with.

The differential device 15 includes a first power transmission mechanism B for transmitting the rotation of the synchronous rotary shaft 14 to the ground gear holding shaft 16, which is an output shaft, without changing the speed, and a first power transmission mechanism B for transmitting the rotation of the synchronous rotary shaft 14 without changing the speed. The gear holding shaft 16 to be ground
A second power transmission mechanism C is provided in a parallel relationship with the first power transmission mechanism B for transmitting power to the gear to be ground. 17 is placed and held. A phase detector 18 for detecting the rotational phase of the gear to be ground 17 is provided near the gear to be ground 17 while being supported by the base 9.
is installed.

The base 1 can be moved in a horizontal direction perpendicular to the grindstone support shaft 4 by the operation of the position adjustment electric motor 19, thereby adjusting the depth of engagement of the grindstone 5 into the gear to be ground 17, and The base 9 is moved to the grindstone support shaft 4 by the operation of the position adjustment electric motor 19'.
The grinding wheel 17 can be moved in a direction parallel to the grinding wheel 5, thereby adjusting the axial position of the grinding wheel 5 relative to the grinding wheel 5 of the gear to be ground 17.

Next, an example of a specific structure of the differential device 15 will be described in detail. In FIG. 2, an input-side cylindrical portion 22 of an outer shell 21 of a differential device 15 is fixed to an opening 20 of a base 9 along its lower edge, and the input side cylindrical portion 22 extends vertically. The upper end of the shaft 14 passes through the opening 20 of the base 9 and the input-side cylindrical portion 22 of the outer shell 21 and projects into the center of the outer shell 21 . An output side cylindrical portion 23 of the outer shell 21 is formed above the input side cylindrical portion 22 , and the output side cylindrical portion 23 has a shaft 16 that does not support the gear to be ground.
The lower end portion of is fitted to be rotatable around the vertical axis.

The first power transmission mechanism B will be explained below. Inside the outer shell 21, an annular rotating body 24 is attached to an annular shoulder formed on the outer periphery of the synchronous rotating shaft 14.
The lower bottom of the annular rotating body 24 is fixed, and the upper surface of the lower bottom of the annular rotating body 24 is circumscribed by an annular partial spherical surface 25 formed on the outer peripheral surface of the lower end of the gear holding shaft 16 to be ground. An annular base 27 of the collection chuck 26 is fixed.

A bearing 28 is provided on the outer peripheral surface side of the cylindrical portion of the annular rotating body 24.
The annular lid 29 and the second power transmission mechanism C are rotatably held by the outer shell 21 via the annular rotating body 24.
The gear 30 is fixed. Between the inner peripheral surface of the cylindrical portion of the circular rotating body 24 and the outer peripheral surface of the cylindrical portion near the base 27 of the collector chuck 26, a circular chuck operating body 31 is inserted through the base 27 of the collector chuck 26. The annular rotating body 24 is fitted into the annular rotary body 24 so as to be slidably connected in the vertical direction while being constantly pressed upward by a resilient spring 32 interposed between the annular rotating body 24 and the upper surface of the lower bottom part. The outer circumferential surface of the annular tip 33 of the chuck operating body 31 is in sliding contact with the inner circumferential surface of the lid 29, and the inner circumferential surface of the tip 33 is formed of a tapered surface. , a partially spherical portion formed at the lower end of the gear holding shaft 16 to be ground by pressing the tip of the collecting chuck 26 radially inward in contact with the outer peripheral surface along the tapered surface of the tip of the collecting chuck 26. 25, so that it can be frictionally welded to 25.

Pressure fluid is fed into an annular fluid pressure chamber 34 surrounded by the inner circumferential surface of the annular rotating body 24, the lower surface of the lid body 29, and the outer circumferential surface of the chuck operating body 31. Chuck operating body 31
Normally, the correct chuck 26 moves upward under the elastic force of the elastic spring 32.
Although no rotational force is transmitted between the and the partial spherical portion 25, when pressure fluid is sent into the fluid pressure chamber 34, the chuck actuating body 31 moves downward against the elastic force of the elastic spring 32. By moving the collet chuck 26 and pressing the tip of the collet chuck 26 inward in the radial direction, the rotational force of the synchronous rotary shaft 14 is applied to the gear to be ground without changing speed via the collet chuck 26 and the partially spherical part 25. It is transmitted to the holding shaft 16.

Next, the second power transmission mechanism C will be explained.
Inside the outer shell 21 , a gear shaft is connected parallel to the center line of the synchronous rotation shaft 14 between a bearing 35 supported on the lower wall side of the outer shell 21 and a bearing 36 supported on the upper wall side. A gear 37 is rotatably supported on the outer shell 21, and a gear 39 that meshes with the gear 30 is supported on the lower part of the gear shaft 37 via a clutch 38. A gear 40 having a number of teeth that differs by one tooth from the number of teeth of the gear 39 is supported in the upper portion so as to be able to rotate integrally with the gear shaft 37 . And this gear 4
0 meshes with a gear 41 fixed to a portion above the partial spherical surface portion 25 of the gear holding shaft 16 to be ground, and normally, when the clutch 38 is in the disengaged state, the gear 39 is Rotating force is gear shaft 3
7, but when the clutch 38 is in contact, the rotational force of the synchronous rotating shaft 14 is transmitted to the gear shaft 37 via the annular rotating body 24, the lid 29, the gear 30, the gear 39, and the clutch 38. This is further transmitted via the gears 40 and 41 to the gear holding shaft 16 in a changed state.

A flange portion 42 is formed on the outer periphery of the gear holding shaft 16 to be ground at a position above the output side cylindrical portion 23 of the outer shell 21 . An annular ground gear mounting body 43 for mounting the gear 17 on the upper end surface
The lower edge of is fixed. An annular chuck actuation auxiliary body 45 is fitted into the narrow diameter portion 44 of the gear holding shaft 16 above the flange portion 42.
It is tightened and fixed by a tightening nut 46. The chuck operation auxiliary body 45 has a chuck tip pressing ring part 47, a chuck middle body guide ring part 48, and a chuck base guide ring part 49.
An annular base 51 of the collect chuck 50 interposed between the chuck operation auxiliary member 45 and the chuck base guide ring 49 is in sliding contact with the outer peripheral surface of the chuck base guide ring 49, and the middle body of the collect chuck 50 is , is guided and supported so as to be freely slidable in the axial direction between the outer circumferential surface of the chuck middle body guide ring portion 48 and an annular sliding surface formed on the inner circumferential surface of the gear mounting body 43 to be ground; The contact surface on the inner circumferential side along the tapered surface of the tip 52 of the collection chuck 50 is in contact with the outer circumferential surface having the tapered surface of the chuck tip pressing ring part 47 so as to receive a radially outward pressing force. It's getting old.

A resilient spring 53 is interposed between the base 51 and the flange 42 of the collect chuck 50, and is surrounded by the chuck middle body guide ring 48, the chuck base guide ring 49, and the collect chuck 50. Pressure fluid is fed into the annular fluid pressure chamber 54 formed by
Normally, the collection chuck 50 is moved upward by the elastic force of the resilient spring 53, so that the tip of the collection chuck 50 is not pushed outward in the radial direction by the chuck tip pressing ring 47. However, when pressure fluid is sent into the fluid pressure chamber 54, the collection chuck 50 is pressed downward against the elastic force of the resilient spring 53 and moves, and the tip of the collection chuck 50 accordingly moves. , is pressed radially outward by the chuck tip press ring 47 and presses the inner peripheral surface of the gear to be ground 17 placed on the gear to be ground mount 43, thereby fixing the gear to be ground 17. .

The illustrated gear grinding device operates as follows under the control operation of the control device according to the invention. First, when the gear to be ground 17 is placed on the gear to be ground mount 43 and pressure fluid is fed into the fluid pressure chamber 54, the collection chuck 50 is moved downward against the elastic force of the elastic spring 53. By moving to , the tip of the collect chuck 50 is pressed radially outward by the chuck tip pressing ring 47 , and accordingly presses the inner circumferential surface of the gear to be ground 17 . The gear holding shaft 16 to be ground
Fixed against. During this time, the collet chuck 26 in the first power transmission mechanism B and the clutch 38 in the second power transmission mechanism C are both in the disengaged state, and the rotation of the synchronous rotating shaft 14 does not affect the gear holding shaft 16 to be ground. Not communicated.

After operating the position adjustment electric motor 19' to move the base 9 and adjusting the position of the gear to be ground 17 relative to the grinding wheel 5 in the direction of the grinding wheel support shaft 4, the clutch 38
When placed in contact, the rotation of the synchronous rotating shaft 14 is caused by the rotation of the annular rotating body 24, the lid 29, the gear 30, and the clutch 3.
8. Via the gear shaft 37, gear 40, and gear 41,
The speed is changed according to the speed change rate according to the difference in the number of teeth between the pair of gears 39 and 40, for example, the difference in the number of teeth by one tooth, and is transmitted to the gear holding shaft 16 to be ground. A gear to be ground 17 rotates integrally with the gear 16. Therefore, at this time, the gear to be ground 1
7 does not rotate synchronously with the grinding wheel 5 which is rotating at a constant speed, and the rotational phase of the gear to be ground 17 periodically rotates with respect to the grinding wheel 5.
It is in a state where it can match the rotational phase of.

Therefore, when the rotational phase of the gear to be ground 17 detected by the phase detector 18 matches the rotational phase of the grinding wheel 5 detected by the phase detector 7, the clutch 38 is placed in the disengaged state, and at the same time, the fluid pressure Room 3
When pressure fluid is sent to the chuck actuating body 31
is pushed downward against the elastic force of the elastic spring 32 and moves, and the collection chuck 26 is moved accordingly.
The tip of the synchronous rotating shaft 14 is pressed radially inward and frictionally welded to the partial spherical surface part 25, so that the rotation of the synchronous rotating shaft 14 is carried out via the collect chuck 26 and the partial spherical surface part 25, and the gear to be ground is held without changing speed. is transmitted to the shaft 16. As a result, the gear to be ground 17 is cut by the grinding wheel 5.
Since it rotates synchronously with respect to the grinding wheel 5 under a rotational phase that matches the rotational phase of After adjusting the biting depth, grinding of the gear to be ground 17 can be started.

As described above, according to the present invention, there is provided a grindstone rotation mechanism for rotating a gear grinding wheel at a constant speed; a synchronous rotating shaft; a gear holding shaft for holding and rotating the gear to be ground in a grinding device;
a first power transmission mechanism for transmitting the rotation of the synchronous rotating shaft to the gear holding shaft to be ground without changing the speed; and transmitting the rotation of the synchronous rotating shaft to the gear holding shaft to be ground while changing the speed; a second power transmission mechanism that is in a parallel relationship with the first power transmission mechanism; before starting grinding, the first power transmission mechanism is cut off and the second power transmission mechanism is disconnected; When the power transmission state is set and the rotational phase of the gear to be ground matches the rotational phase of the grindstone, the first power transmission mechanism is immediately set to the power transmission state, and the second power transmission mechanism is set to the cutoff state. Since it includes at least a control device for controlling the operation of the first power transmission mechanism and the second power transmission mechanism, the grinding wheel and the gear to be ground can be connected to each other while the grindstone is being rotated. Therefore, even when grinding multiple gears in sequence, there is no need to repeatedly stop and start the grinding wheel, which reduces the durability of the grinding wheel support shaft and the electric motor for rotating the grinding wheel. It can contribute to sexual improvement.

In particular, by simply switching the operating states of both power transmission mechanisms as appropriate, the asynchronous rotation state of the grinding wheel and the gear to be ground can be easily obtained, and furthermore, the rotational phases of the grinding wheel and the gear to be ground can be matched during the asynchronous rotation. By simply switching the operating states of both power transmission mechanisms at an instant, the rotational phases can be immediately aligned and the grindstone and the gear to be ground can be returned to the synchronous rotational state. It is no longer necessary to specifically move the grinding wheel and the gear to be ground relative to each other in the direction of the grinding wheel axis. Therefore, the processing surface of the grinding wheel can be freely selected to prevent uneven wear, and the grinding accuracy of the device is improved. It is advantageous above.

[Brief explanation of the drawing]

FIG. 1 is a conceptual plan view of a gear grinding device according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a main part of the gear grinding device shown in FIG. 5... Grindstone, 14... Synchronous rotating shaft, 16... Gear holding shaft to be ground, 17... Gear to be ground, A... Grindstone rotation mechanism, B... First power transmission mechanism, C...
Second power transmission mechanism.

Claims (1)

[Claims] 1. A grindstone rotation mechanism A for rotating the gear grinding whetstone 5 at a constant speed; and a synchronous rotation shaft whose speed is adjusted so that it rotates at a rotation speed equal to the synchronous rotation speed of the gear to be ground 17 that is ground by the grindstone 5. 14
and; a gear holding shaft 16 for holding and rotating the gear to be ground 17 in the grinding position;
a first power transmission mechanism B for transmitting the rotation of the synchronous rotating shaft 14 to the gear holding shaft 16 without changing speed; a second power transmission mechanism C that is in a parallel relationship with the first power transmission mechanism B for transmitting power to the shaft 16; before starting grinding, the first power transmission mechanism B is cut off; putting the second power transmission mechanism C into a power transmission state;
When the rotational phase of the gear to be ground 17 matches the rotational phase of the grindstone 5, the first power transmission mechanism B is immediately put into the power transmission state, and the second power transmission mechanism C is put into the cutoff state. A gear grinding device comprising at least a control device for controlling the operation of the first power transmission mechanism B and the second power transmission mechanism C.