JP2000117539A - Grinding wheel shaft driving device for internal gear type gear honing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve high speed rotation machining of an internal gear type gear honing machine and further machining precision of a gear to be machined, to lengthen a dress interval, to reduce the generation of noise, and to facilitate maintenance of a drive mechanism. SOLUTION: A power transmission means for a grinding wheel shaft comprises large pulleys 4 arranged on both sides of a grinding wheel shaft; a drive shaft 6 connected to a drive motor 5 to drive a grinding wheel shaft; small pulleys 7 arranged on both sides of the drive shaft; and a V-belt combination type belt 8 running around and between the large and small pulleys with the belt transmitting a power, and the transmission forming a double-sided belt drive. Further, the drive shaft is supported by a small bearing arranged between small pulleys. The support arm 18 of the small bearing is fixed on the grinding wheel head side through a space part 17 formed by the small pulley, the large pulley, and the belt and further, a balance barrel 12 is mounted along the inner periphery of the large pulley or the inner periphery of a grinding wheel press ring 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal gear type honing machine for finishing a tooth surface of a gear to be processed by meshing the internal gear with a gear to be processed and rotating and driving the internal gear. The present invention relates to a rotation driving device for a grinding wheel shaft that is mounted and held and rotationally driven.

[0002]

2. Description of the Related Art An internal gear type gear honing machine (hard gear honing machine) which has excellent productivity among heat-treated gear tooth surface finishing methods and which can finish tooth surfaces with high accuracy at a relatively low cost is available. It has become widely used. As shown in FIGS. 4 and 5, the processing gear 11 rotatably supported by the left and right headstocks 31 and the tailstock 32 at the center of the shaft is formed by intersecting the Z-axis parallel to the central axis 30 with the crossing angle. Rotation drive around the Y axis that forms θ (arrow C)
In addition to rotating the honing grindstone 1 in the form of an internal gear, the reciprocating motion is sometimes performed also in the Z-axis direction, and a honing process is performed by pouring a grinding fluid into the meshing portion.

Here, the structure of the portion for rotating and driving the internal gear type honing grindstone 1 is, for example, supported on a work table 33 so that a grindstone head 34 can be tilted in the direction of arrow A. As shown in FIG.
In a, an annular grindstone shaft 35 whose outer peripheral surface 35a is supported via a bearing 3 is provided. On the inner peripheral side of the grindstone shaft 35, an internal gear type honing grindstone 1 having a short cylindrical outer shape and having internal teeth 1a on the inner peripheral portion is inserted. 37. The grindstone holder 37 uses a bolt 38 to grind the grindstone shaft 3
Fixed to 5. A cover 40 provided with an oil seal 39 for fixing the bearing 3 and preventing leakage of bearing lubricating oil is attached to both sides of the grindstone head 34.

A drive motor 5 is provided at an end of the grindstone head 34, and a drive shaft 42 provided with a sprocket 41 on the outer periphery is connected to a tip of the drive motor shaft 5a. on the other hand,
A sprocket 43 is provided at the center of the outer periphery of the grinding wheel shaft 35, and power is transmitted to the drive shaft 42 via a chain 44, so that the grinding wheel shaft is driven to rotate. In another example, the sprockets 41 and 43 and the chain 44 are replaced by a gear train.

[0005]

However, in such driving with a chain sprocket or a gear train, meshing vibration is generated, which deteriorates the machining accuracy of the gear to be machined, and furthermore, the tooth surface of the internal tooth grindstone loses its tooth profile. The problem is that the dress interval is short and the noise is loud. In the method in which the chain 44 is driven around the outer periphery of the grinding wheel shaft 35, 35 m / sec.
At a rotation speed exceeding c, it could not be used, and the processing efficiency could not be increased. Further, when replacing the gears or the chain, there is a problem that the grindstone head 34 must be disassembled and the maintenance of the drive mechanism is difficult. An object of the present invention is to solve such a conventional problem.

[0006]

According to the present invention, an outer peripheral portion of an internal gear type honing grindstone having internal teeth on an inner peripheral portion is provided.
In an internal gear type gear honing machine having a grinding wheel shaft that is fitted and held on the inner peripheral surface thereof and rotationally driven, the power transmission means of the grinding wheel shaft is driven by a large pulley provided on both sides of the grinding wheel shaft and the grinding wheel shaft. The internal gear type is a belt drive composed of a drive shaft connected to a drive motor to be driven, small pulleys provided on both sides of the drive shaft, and belts each of which is capable of transmitting power between the large pulley and the small pulley. The problem has been solved by providing a grinding wheel shaft driving device for a gear honing machine.

Since pulleys are provided on both sides of the drive shaft and the grindstone shaft to drive the belt, meshing vibrations generated by the gear train and the chain sprocket do not occur. In addition, since the pulleys are arranged on both sides, the fit between the grindstone head, the bearing and the grindstone shaft is stabilized by the belt tension, and occurs randomly in the radial direction of the grindstone shaft due to the fitting gap generated in the case of conventional chain sprockets and the like. The whirling is small, the rotation of the rotating shaft is stable, the rotation accuracy is improved,
Vibration is also reduced. Furthermore, a large number of rotations can be obtained. On the other hand, if the belt is hung only on one of the outer periphery center (inside of the bearing) or the outside of the grindstone shaft as in the case of the conventional chain sprocket, the whirling effect is small.

By arranging the large pulley on both sides of the grinding wheel shaft, the belt can be removed from the large pulley without being disturbed by the bearing. On the side opposite to the drive motor, the belt can be easily removed without disassembling the main part of the drive section only by removing auxiliary parts such as the cover. On the other hand, it is necessary to remove the drive motor on the drive motor side depending on the method of supporting the drive shaft. Therefore, in claim 2, the drive shaft is supported by a small bearing provided between the small pulleys, and in providing the support arm for supporting the small bearing, the support arm is connected to the large pulley, the small pulley and the belt on the drive motor side. It was fixed to the grindstone head through the space surrounded by. Thus, even when the drive motor is removed, when the belt is removed, one of the belts passes between the support arm and the large pulley, and the other passes through the opposite side of the drive shaft from the support arm, so that the drive shaft passes through the belt. Let me
The belt can be easily removed from the large and small pulleys on the drive motor side.

The belt is a V-belt, a V-belt connection type,
A flat belt, a toothed belt (timing belt), or the like can be used. However, it is preferable to be suitable for a high peripheral speed and to be able to suppress vibration. Therefore, in claim 3, the belt is a V-belt connection type belt. The V-belt connection type is a type in which a plurality of V-belts are arranged in parallel, and the cross section on the pulley contact side is formed in a V-wave shape.

As the rotational speed increases, it is desired to adjust the rotational balance. In the conventional one, it is necessary to separately provide a balancing member on the outside in order to provide a balance mechanism. On the other hand, in the present invention, an inner peripheral surface of a grinding wheel shaft, a large pulley, or the like can be used. In view of this, in claim 4, a balance pin can be attached to a position that does not interfere with the internal gear attached to the grinding wheel shaft and the processed gear or dress gear meshing with the internal gear whetstone on the inner peripheral side of the grinding wheel shaft. , The balance can be adjusted. As a result, the field balance can be performed at any time.

Further, in order to facilitate the mounting and adjustment of the balance frame, in claim 5, the mounting portion of the balance frame is provided along the inner circumference of the large pulley or the inner circumference of the grindstone holding ring, and the outer circumference is enlarged. And a trapezoidal groove having a trapezoidal cross section. On the other hand, the balance frame is composed of two partial frames and a fixing screw. Each of the two partial frames is provided with a contact slope that comes into contact with the slope of the trapezoidal groove, a division surface opposite to the contact slope, and a wide side direction from the narrow side of the contact slope along the division surface. A partial screw hole is provided. In addition, 2
The two partial tops can be fitted into the trapezoidal groove individually or with the divided surfaces together. After the fitting, the divided surfaces of the two partial tops are aligned, and the divided surfaces are in contact with each other or with the divided surfaces expanded. The tangential slope approaches or abuts the trapezoidal groove slope so that the fixing screw can be screwed. Further, the tip of the fixing screw can be brought into contact with the bottom of the trapezoidal groove.

According to this, the partial top is fitted into the trapezoidal groove, and the position of the division surface is adjusted. Further, by screwing a fixing screw into a partial screw hole provided on the division surface, the two partial frames are substantially integrated into a trapezoidal groove to form a set of balance frames. In this state, there is a gap between the partial top and the trapezoidal groove, especially the slope of the trapezoidal groove and the contact surface between the partial tops. You can move. When the tip of the fixing screw is brought into contact with the bottom of the trapezoidal groove, the partial frame is lifted, and the slope of the trapezoidal groove and the contact surface of the partial frame approach each other. Furthermore, by projecting the tip of the fixing screw from the balance top toward the bottom of the trapezoidal groove, the slope of the trapezoidal groove and the contact surface of the partial top abut, and the balance top is securely fixed to the trapezoidal groove.

On the other hand, if the fixing screw is rotated and retracted in the direction opposite to the bottom of the trapezoidal groove, the fitting between the trapezoidal groove and the balance top is loosened, and the balance top can be easily moved along the trapezoidal groove. Therefore, since the balance frame can be fixed at an arbitrary position, field balancing can be easily performed by balancing the left and right surfaces using both sides of the grinding wheel shaft.

[0014]

Next, an embodiment of the present invention will be described. FIG. 1 is a side view showing an embodiment of a grindstone shaft driving device of the present invention, FIG. 2 is a partial cross-sectional view taken along line AA of FIG. 1, and FIG. ) Is a partial perspective view of the balance top provided on the inner peripheral surface of the large pulley,
(B) and (c) are partial cross-sectional views taken along the line BB of FIGS. 2 and (a), (b) is a cross-sectional view showing a free state of the balance top, and (c) is a cross-sectional view showing a fixed state of the balance top. . Figures 1 and 2
Numeral 21 denotes a grindstone head, which is rotatably mounted in a direction A on a work table 33 of a gear honing machine (see FIG. 4). The grindstone shaft 2 is supported on the inner peripheral side of the grindstone head 21 via a pair of bearings 3. The outer ring 3a of the bearing 3 is fitted into the large-diameter hole 21a of the grinding wheel head 21 from both ends, and is fixed between the cover 22 and the grinding wheel head inner peripheral center convex portion 21b by a bolt (not shown).

On the other hand, an inner race 3 b of the bearing 3 is provided on the outer peripheral surface 2 a of the grinding wheel shaft 2, and the grinding wheel shaft is rotatable with respect to the grinding wheel head 21. The internal tooth whetstone 1 is fitted into the inner circumference 2b of the whetstone shaft, and both sides thereof are sandwiched and fixed by a whetstone holding ring 13 via a whetstone collar 23 by bolts (not shown).
The grinding wheel collar 23 is used for adjusting the gap in the axial direction. Further, large pulleys 4 are fixed to both ends of the grinding wheel shaft 2 coaxially with the grinding wheel shaft with bolts (not shown). The bearing inner ring 3b is fixed in the axial direction between the large pulley 4 and the spacer 2c on the outer periphery of the grinding wheel shaft. A labyrinth seal 29 is provided near the inner periphery of the end of the cover 22 and at the outer periphery of the large pulley 4 to prevent intrusion of the grinding fluid. Labyrinth seal 29
Instead of the oil seal described in the conventional example, the labyrinth seal is more suitable for higher speed.

1 and 2, a bracket 25 extends above the grindstone head 21, and the drive motor 5
And a drive shaft housing 26 provided with the drive shaft 6. The drive shaft 6 is configured to be parallel to the grinding wheel shaft 2. One end 27a of the adjusting screw 27 is rotatably provided on the drive shaft housing 26 while being regulated in the axial direction, and the other end 27b is screwed to a screw 25a provided on the bracket 25. The rear surface 25b of the bracket 25 and the rear surface 26b of the drive shaft housing form a slip surface, and the drive shaft housing 26 is movable in the same direction as the line connecting the drive shaft 6 and the axis of the grinding wheel shaft 2. Bracket back 2
5b is provided with a fixing screw hole (not shown), and a long hole (not shown) that is long in the moving direction is formed in the rear surface 26b of the drive shaft housing, and a bolt 26c is screwed into the fixing screw hole through the long hole. ing. By loosening the bolt 26c and rotating the adjustment screw 27, the drive shaft housing moves in the direction of arrow D, and the distance between the grinding wheel shaft 2 and the drive shaft 6 can be adjusted.

As shown in FIG. 2, the drive shaft 6 is supported by a pair of small bearings 10, and small pulleys 7 are attached to both ends. A plurality of V-grooves 4b are formed on the outer circumference of the small pulley 7 and the large pulley 4, respectively, and a V-belt-coupled type belt 8 suitable for this groove is hung between the small pulley and the large pulley. The belt tension is adjusted by the adjusting screw 27. The drive shaft of the drive motor 5 is connected to one end of the drive shaft 6, and the pair of small bearings 10 are supported by support arms 18. The support arm 18 passes through the space 17 surrounded by the large pulley 4, the small pulley 7, and the belt on the drive motor 5 side, and the drive motor mounting portion 26 a of the drive housing 26, the drive housing rear surface 26 b, the bolt 26 c, the bracket 2
5 is fixed to the grindstone head 21.

As shown in FIG. 3, a trapezoidal groove 14 having a trapezoidal cross section is formed on the entire inner periphery 4a of both large pulleys 4. The trapezoidal groove 14 is wide on the outer peripheral side, and three sets of balance tops 12 each composed of two partial tops 15 and fixing screws 16 are assembled in total, that is, six sets in total.
The two partial frames 15 each have a trapezoidal groove slope 14a.
15a, a split surface 15b on the opposite side of the contact slope, and a partial screw hole 15c provided from the narrow side to the wide side of the contact slope along the divided surface. .

The width of the two partial tops 15 is
The width is set such that they can be fitted into the trapezoidal groove 14 together, and can be incorporated into the trapezoidal groove 14 without attaching the fixing screw 16. After that, the positions of the divided surfaces 15b of the two partial frames 15 are aligned, and the fixing screw 16 is screwed in a state where the divided surfaces are slightly widened, so that the balance frame 12 can be formed. This state is shown in FIG.
Shown in Also, as shown in FIG.
Can be screwed in with a slight gap between the contact slope 15a and the trapezoidal groove slope 14a.
a can contact the bottom 14b of the trapezoidal groove. By projecting the tip 16a of the fixing screw 16 from the balance top 15 to the bottom 14b of the trapezoidal groove, the slope 14a of the trapezoidal groove comes into contact with the contact surface 15a of the partial top as shown in FIG. 12 is securely fixed to the trapezoidal groove 14.

According to this embodiment, the driving motor 5
Is smoothly transmitted to the drive shaft 6, the small pulleys 7 on both sides, the belts 8 on both sides, the large pulleys 4 on both sides, and the grinding wheel shaft 2,
Dressing and honing without vibrations are performed by the internal tooth whetstone 1 with high accuracy. The tension of the belt 8 is adjusted by the adjusting screw 2.
7 can be set arbitrarily. Further, since the support arm 18 does not interfere with the belt 8, even the belt on the drive motor side can be easily removed from the pulleys 4, 10.
Further, the balance pulleys 12 are respectively attached to the large pulleys 4 on both sides.
Can be fixed at an arbitrary position, so that field balancing by the two-plane correction method when the large pulley, the grinding wheel shaft 2 and the like rotate integrally is easy.

In the embodiment, the support arm 18
Is attached to the drive housing, but it goes without saying that there are various forms such as fixing the support arm directly to the grindstone head by providing a belt tension adjusting screw etc. between the drive shaft and the support arm. Absent. Also, the partial frames 15 can be inserted into the trapezoidal grooves 14 one by one and then slid together to form a set of balanced frames by combining the divided surfaces 15b. In this case, the gap 1 between the divided surfaces when assembled
5d can be reduced, the effective screw portion of the partial screw hole 15c can be increased, and the processing of the partial top 15 is easy. Also,
Although illustration and description are omitted in the embodiment, it goes without saying that a cover and the like are provided around the belt and the like.

[0022]

According to the present invention, pulleys are provided on both sides of the drive shaft and the grindstone shaft to drive the belt, vibrations are remarkably reduced, and the pulleys are arranged on both sides to secure a rotating torque, and the belt is driven. The tension makes it possible to stabilize the fit between the grindstone head, bearings and grindstone shaft, reduce whirling, and achieve high-precision, stable rotation.
A high speed rotation of, for example, 45 m / sec at the pulley peripheral speed can be stably obtained. In addition, the noise during the rotation of the grindstone shaft was reduced by 10 dBA or more compared to the conventional art, and the effect of greatly contributing to work improvement was achieved.

As for the processing efficiency, the processing efficiency per unit time increased by 60 to 100% in the allowance. Conversely, for example, in the case of machining a conventional machining allowance, the actual machining time can be reduced by half, which contributes to shortening of the cycle time. In addition, since whirling is small, machining accuracy is improved. Furthermore, since the grinding wheel can be rotated at a high speed, the load on the tooth surface of the grinding wheel is reduced when machining is performed at the same cutting speed as before, so that the grinding wheel life is extended and the dress interval is long.

Further, the drive shaft is supported by bearings provided between the small pulleys, and the belt can be easily removed from the large and small pulleys without separating the drive shaft and the drive motor in the axial direction. The belt can be easily replaced without the necessity of disassembling the grindstone head as in the case of replacing the gears and chains, and the maintenance of the drive mechanism is facilitated.

Further, the use of a V-belt connection type belt further enhances the above effect.

The balance can be mounted on the inner peripheral side of the grinding wheel shaft, and the balance can be adjusted. Therefore, the balance at the time of high-speed rotation can be adjusted, so that stable rotation without vibration can be obtained, and higher speed can be obtained. Rotation is obtained, and machining efficiency is improved. In addition, it is now possible to easily adjust the whetstone and whetstone color as many times as necessary.

Further, the balance frame is fitted into the trapezoidal groove having a trapezoidal cross section provided along the inner periphery of the large pulley or the inner periphery of the grindstone holding ring and having a larger outer peripheral side, and is moved and fixed at an arbitrary position. The possible top shape has a simple structure and is easy to handle.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a grindstone shaft driving device of an internal gear type gear honing machine of the present invention.

FIG. 2 is a partial sectional view taken along the line AA of FIG. 1 showing one embodiment of a grindstone shaft driving device for the internal gear type gear honing machine of the present invention.

FIG. 3 shows an embodiment of a balance frame according to the present invention;
(A) is a partial perspective view of a balance top provided on the inner peripheral surface of the large pulley, (b) and (c) are B-
It is sectional drawing which shows the free state of a balance top, and (c) is a sectional view which shows the fixed state of a balance top.

FIG. 4 is a partial perspective view of a conventional internal gear type gear honing machine.

FIG. 5 is an explanatory diagram showing a relationship between a grinding wheel head and a gear to be processed of the internal gear type gear honing machine.

FIG. 6 is a partial sectional view of a conventional grindstone shaft driving device for an internal gear type gear honing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal gear type honing grindstone 1a Grinding stone inner teeth 1b Grinding stone outer peripheral part 2 Grinding stone shaft 2b Grinding stone shaft inner peripheral surface 4 Large pulley 4a Large pulley inner circumference 5 Drive motor 6 Drive shaft 7 Small pulley 8 Belt 9 Internal gear type gear honing machine Grinding stone shaft driving device 10 Small bearing 11 Work gear, dress gear, dress ring, etc. 12 Balance top 13 Grinding stone holding ring 13a Inner circumference of grinding stone holding ring 14 Trapezoidal groove 14a Slope of trapezoidal groove 14b Bottom of trapezoidal groove 15 Partial top 15a Contact slope 15b Dividing surface 15c Partial screw hole 16 Fixing screw 16a Tip of fixing screw 17 Space 18 Support arm 21 Grinding stone head

Claims (5)

[Claims] 1. An internal gear type gear honing machine having a grinding wheel shaft that is driven by rotating an outer peripheral portion of an internal gear type honing stone having internal teeth on an inner peripheral portion by fitting the outer peripheral portion to an inner peripheral surface thereof, Power transmission means of the grinding wheel shaft, a large pulley provided on both sides of the grinding wheel shaft, a drive shaft connected to a drive motor that drives the grinding wheel shaft, a small pulley provided on both sides of the drive shaft And a belt driven between the large pulley and the small pulley so as to be able to transmit power. 2. The drive shaft is supported by a small bearing provided between small pulleys, and a supporting arm for supporting the small bearing has a space surrounded by the large pulley, the small pulley, and a belt on the drive motor side. 2. The grinding wheel shaft driving device for an internal gear type honing machine according to claim 1, wherein the grinding wheel shaft is fixed to the grinding wheel head. 3. The grinding wheel shaft driving device for an internal gear type gear honing machine according to claim 1, wherein the belt is a V-belt coupling type. 4. A balance frame can be mounted on the inner peripheral side of the grinding wheel shaft at a position not interfering with an internal tooth wheel mounted on the wheel shaft, a processed gear meshing with the internal tooth wheel, a dress gear, or the like. 4. The grindstone shaft driving device for an internal gear type gear honing machine according to claim 1, 2 or 3. 5. The mounting portion of the balance top is a trapezoidal groove having a trapezoidal cross section provided along the inner periphery of the large pulley or the inner periphery of the grindstone holding ring and having a larger outer periphery side. It consists of two partial frames and a fixing screw, and the two partial frames are respectively in contact with the inclined surface of the trapezoidal groove, a divided surface on the opposite side of the inclined surface, and the contact surface along the divided surface. And a partial screw hole provided from the narrow side to the wide side of the sloping surface. Further, the two partial tops can be fitted into the trapezoidal groove with each or the divided surfaces together, and after the fitting, two The positions of the divided surfaces of the partial tops are aligned with each other, and the fixing screw can be screwed in such a manner that the contacting slope is close to or in contact with the trapezoidal groove slope in a state where the dividing surface is in contact or the divided surface is expanded, and The tip of the fixing screw is forward 5. The grindstone shaft driving device for an internal gear type gear honing machine according to claim 4, wherein the bottom portion of the trapezoidal groove is abuttable.