JPS6213140B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal grinding machine, and more particularly to an internal grinding machine in which the amount of protrusion of a grindstone along the radial direction of a spindle is adjusted.

An internal grinding machine has already been proposed in which the amount of protrusion of the grinding wheel along the radial direction of the spindle can be adjusted while the spindle is rotating, that is, while the grinding machine is operating (Japanese Patent Application No. 56-054659, No. 56-56). 054660
issue). With these internal grinding machines, the amount of protrusion of the grinding wheel was adjusted while it was still tightened, so not only did it require a large amount of force to adjust the amount of protrusion, but it was also difficult to use too much force. If it is tightened, adjustment becomes impossible, so there have been cases where it has not always been possible to tighten the grinding wheel with a force sufficient for high-precision grinding. As a result, vibration of the grindstone occurs during grinding, which may be undesirable in terms of grinding accuracy and life of the grindstone.

SUMMARY OF THE INVENTION An object of the present invention is to provide an internal grinding machine in which the amount of protrusion of the grinding wheel can be adjusted easily during operation, and the grinding wheel is firmly fixed at one end of the spindle except when adjusting the amount of protrusion of the grinding wheel. be.

The present invention provides a spindle that is rotatably supported by a fixed part and connected to a rotation drive shaft, a plurality of grindstones arranged at one end of the spindle and movable along the radial direction of the spindle, and the plurality of grindstones. A protrusion is formed in which a feed portion is engaged directly or indirectly, and the protrusion amount of the grindstone can be adjusted by rotating with respect to the spindle, and the protrusion is movable along the direction of the center line of the spindle. an amount adjusting member; a driving gear fixed to a predetermined position of the spindle;
a plurality of planetary shafts rotatably supported around the spindle and arranged on a virtual circumference around the spindle; a first planetary gear meshed with the drive gear and rotatably supported by each planetary shaft; A differential internal gear meshed with the first planetary gear and rotatably supported by the fixed part, a grindstone feeding mechanism capable of rotating the differential internal gear, and a fixed internal gear fixed to the fixed part. A gear, a second planetary gear meshed with the fixed internal gear and rotatably supported on each planetary shaft, a transmission gear meshed with the second planetary gear and rotatably supported around the spindle, and transmission. The gear is inserted into the gear so as to be movable only in the direction along the center line of the spindle, and has a protrusion integrally provided with the protrusion amount adjusting member;
a transmission differential mechanism that rotates the protrusion amount adjusting member in synchronization with the spindle and moves the protrusion amount adjusting member relative to the spindle by rotating a differential internal gear using a grindstone feeding mechanism; a third planetary gear meshed with the lifting gear and rotatably supported by each of the planetary shafts; , has a tightening internal gear meshed with the third planetary gear and rotatably supported by the fixed part, and by rotating the tightening internal gear, the protrusion amount adjusting member is adjusted to the center of the spindle. An elevating and lowering tightening mechanism is provided that moves the grinding wheel along the line direction and tightens or loosens the grinding wheel toward one end of the spindle.Usually, the tightening mechanism is operated and the protrusion adjustment member tightens the grinding wheel toward one end of the spindle to tighten it. When adjusting the amount of protrusion of the whetstone, the lifting tension mechanism is operated to release the tightening of the whetstone by the protrusion amount adjustment member, and then the transmission differential mechanism is operated to adjust the amount of protrusion adjustment member. The amount of protrusion of the grinding wheel is adjusted by rotating it relative to the spindle, and when the adjustment is completed, operate the elevating and lowering tightening mechanism again to tighten the grinding wheel to one end of the spindle using the protrusion amount adjustment member to firmly hold the grinding wheel. The purpose is to achieve the above objective by making it possible.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show an embodiment of an internal grinding machine according to the present invention.

In these figures, one end of a rotary drive shaft 1 connected to an output shaft of a drive motor (not shown),
It is connected to the upper end of the spindle 3 via an Oldham coupling 2.

The spindle 3 is rotatably inserted through the center of a substantially inverted flower pot-shaped case body 4 as a fixed part fixed to the spindle 3, and a grindstone head 5 is attached to the lower end. Further, a substantially cross-shaped rotating arm 6 is rotatably supported at a predetermined position in the case body 4 of the spindle 3, and a planetary shaft 7 is pivotally supported on each side of the rotating arm 6. .

A total of four planetary shafts 7 are provided around the spindle 3, and these planetary shafts 7 are rotatably arranged on a virtual circumference centered on the spindle 3 via the rotating arm 6 at equal intervals from each other. First to third planetary gears 8 to 10 are rotatably supported on the planetary shaft 7, respectively.

A driving gear 11 is fixed at a predetermined position on the side of the grinding wheel head 5 from the mounting position of the rotary arm 6 in the case body 4 of the spindle 3, and the first planetary gear 8 is meshed with this driving gear 11. At the same time, it is meshed with the differential internal gear 12.

The differential internal gear 12 is rotatable along the inner peripheral surface of the case body 4, and a rack portion 13 is carved on the outer peripheral edge of the differential internal gear 12. The worm gear 14 is meshed with the worm gear 14.
The rotation axis of the worm gear 14 is provided along the tangential direction at a predetermined position on the outer periphery of the case body 4, and a grip part 15 and a scale part 16 are provided at one end of the worm gear 14. The differential internal gear 12 is rotated by manipulating the worm gear 14 by holding the grip 15 while looking at it.

The second planetary gear 9 is meshed with a transmission gear 21 located below the drive gear 11 in the figure and a fixed internal gear 22 fixed to the inner circumference of the case body 4. A cylindrical portion 23 is formed integrally with the transmission gear 21 on the grindstone head 5 side of the transmission gear 21.
A spindle 3 is connected to the inside of the transmission gear 21 and the cylindrical portion 23 via a cylindrical shank 24.
is inserted.

The third planetary gear 10 is located below the transmission gear 21 in the drawing, and includes an elevating gear 31 externally fitted on the cylindrical portion 23 and a tightening mechanism rotatably provided on the inner periphery of the case body 4. It is meshed with the internal gear 32. A spiral groove 33 is formed on the inner peripheral edge of the lifting gear 31, and a protrusion 34 fixed at a predetermined position of the shank 24 is slidably fitted into the spiral groove 33, so that the lifting gear 31 is connected to the shank 2.
4, the shank 24
is configured to be raised and lowered relative to the lifting gear 31.

The protrusion 34 is inserted into the spiral groove 33 after being loosely inserted into the insertion window 35 bored at a predetermined position of the cylindrical part 23, but the insertion window 35 is inserted in the circumferential direction of the cylindrical part 23 The protrusion 34 is formed to have a predetermined length and a width that does not hinder the elevation and descent of the protrusion 34 . Further, when the cylindrical portion 23 is rotated, the insertion window 35
The protrusion 34 comes into contact with one end, and even if the inner peripheral surfaces of the transmission gear 21 and the cylindrical portion 23 and the outer peripheral surface of the shank 24 are not pressed together, the rotation of the transmission gear 21 is caused by the rotation of the shank 24. The information is now being reliably communicated to the public.

A handle 36 is protruded from a predetermined position of the tightening internal gear 32 (see FIG. 1), and the tightening internal gear 32 is rotated from the outside of the case body 4 by the handle 36. Be manipulated.

A lid part 37 is attached to the lower opening of the case body 4, and the spindle 3 and the shank 24 protrude downward in the figure from a central hole 38 of the lid part 37. A sealing 39 is provided around the housing 24 to prevent the lubricating oil inside the case body 4 from leaking.

The spindle 3 is inserted into the shank 24,
The spindle 3 projects downward by a predetermined length from the lower end of the shank 24, and its central axis is positioned with respect to the shank 24 at both ends of the shank 24.

A threaded portion is carved on the outer periphery of the lower end of the shank 24, and the protrusion amount adjusting member 41 of the grindstone head 5 is firmly fixed to this threaded portion by a tightening ring 42.
1 and is always rotated and raised and lowered together. The outer circumferential surface of the shank 24 and the inner circumferential surfaces of the transmission gear 21 and the cylindrical portion 23 are in slidable surface contact, and the protrusion amount adjusting member 41 is rotatable relative to the spindle 3 and within a predetermined range. It is possible to move along the center line direction of the spindle 3. Further, this protrusion amount adjusting member 41 is formed in a substantially cylindrical shape, and has an insertion hole 43 bored in the center thereof, and a feed groove 44 as a feed portion in the lower end surface.
is formed.

On the other hand, a portion of the outer circumferential surface of the lower end of the spindle 3 that protrudes from the lower end of the shank 24 is formed into a tapered shape that gradually becomes narrower toward the lower end.
A tapered portion 46 of the inner peripheral surface on the upper end side of the cylindrical body 45 is removably fitted into the tapered outer peripheral surface.

A flange 48 integrally formed with a cylindrically protruding threaded portion 47 is fixed to the lower end of the cylindrical body 45 , and a stop bolt 50 is attached to the center of the flange 48 so that it is aligned with the center line of the spindle 3 . The tapered portion 46 and the tapered outer circumferential surface of the spindle 3 are inserted into the screw hole 49 drilled in the lower end surface of the spindle 3, and when the set bolt 50 is tightened, the tapered portion 46 and the tapered outer circumferential surface of the spindle 3 are screwed together. are pressed together, and the rotation of the spindle 3 is transmitted to the cylinder 45.

The collar portion 48 is fitted into a circular groove 52 carved in the lower end surface of the substantially cylindrical whetstone holding member 51, and has three grooves arranged at 120 degree intervals on an imaginary circumference centered on the spindle 3. It is fixed to the grindstone holding member 51 with fixing screws 53 (see FIG. 3).

A center hole 54 through which the cylindrical body 45 is inserted is bored in the center of the grindstone holding member 51, and a radial guide groove 5 is formed in the upper end side as shown in FIG.
5 is provided.

The radial guide grooves 55 are open on the upper end surface side of the grindstone holding member 51, and three grooves are provided at intervals of 120 degrees along the longitudinal direction centering on the center hole 54.

Into the radial guide grooves 55, substantially rectangular parallelepiped-shaped grindstones 56 are slidably fitted.
A pin 57 is provided at a predetermined location on the grindstone 56 so as to protrude from the upper end surface of the grindstone 56 . Whetstone 5
When 6 is fitted into the radial guide groove 55, it can be pressed toward the grindstone holding member 51 by the lower end surface of the protrusion amount adjusting member 41, and in the pressed state, the whetstone 56 is the protrusion amount adjusting member. 41 and the grindstone holding member 51.

Further, the pin 57 of the grindstone 56 is connected to the protrusion amount adjusting member 4.
It is slidably fitted into the feed groove 44 of No. 1,
When the protrusion amount adjusting member 41 and the grindstone holding member 51 are rotated relative to each other, the amount of protrusion of the grindstone 56 in the longitudinal direction is adjusted. That is, the feed groove 44 is formed in an Archimedean spiral shape, a circular arc shape, etc.
When the insertion position of the pin 57 in 4 is moved,
Accordingly, the position of the grindstone 56 within the radial guide groove 55 is moved.

Note that the first and second planetary gears 8 and 9, the differential internal gear 12, the fixed internal gear 22, and the transmission gear 2
1. A transmission differential mechanism 6 that rotates the protrusion amount adjusting member 41 in synchronization with the spindle 3 using the protruding portion 34 of the shank 24 and the insertion window 35 of the cylindrical portion 23 and rotates the adjusting member 41 relative to the spindle 3.
0 is configured, and the rack portion 1 of the differential internal gear 12
3 and the worm gear 14 constitute a grindstone feeding mechanism 70 that operates the transmission differential mechanism 60 while the spindle 3 is rotating, and includes a spiral groove 33 of the lifting gear 31, a protrusion 34 of the shank 24, and a third planetary gear 10. , an elevating and lowering tightening mechanism 90 that moves the protrusion amount adjusting member 41 along the center line direction of the spindle 3 using the tightening internal gear 32 and the handle 36 and raises and lowers the adjusting member 41 relative to the grindstone 56 to tighten the grindstone 56. It is configured.

Next, the operation of this embodiment will be explained.

The rotation of the rotary drive shaft 1 is controlled by the Oldham coupling 2.
The signal is transmitted to the spindle 3 via the motor, and the driving gear 11 is rotated. Since any rotational runout of the rotary drive shaft 1 is absorbed by the Oldham coupling 2, the rotational runout is not transmitted to the spindle 3 and the driving gear 11.

During normal operation, the protrusion 34 is connected to the spiral groove 33.
The grindstone 56 of the grindstone head 5 is firmly held between the grindstone holding member 51 by the protrusion amount adjusting member 41, and the inner surface of the workpiece is ground in this state. During grinding, the grindstone 56 is firmly held by the grindstone head 5, which is one end of the spindle 3, so that no vibration occurs in the grindstone 56.

When the driving gear 11 rotates, the rotation arm 6 of the planetary gear mechanism configured around the driving gear 11 rotates, and the rotation of the driving gear 11, that is, the spindle 3, is integrally transferred to the transmission gear 21 by the transmission differential mechanism 60. The transmission is transmitted to the formed cylindrical portion 23, and further transmitted to the shank 24 by the protrusion 34 and the insertion window 35.
As a result, the protrusion amount adjusting member 41 fixed to the lower end side of the shank 24 rotates in synchronization with the spindle 3.

When adjusting the amount of protrusion of the grindstone 56, first the handle 36 of the elevating and lowering tightening mechanism 90 is operated to rotate the tightening internal gear 32 within the case body 4. Third planetary gear 1 on which the tightening internal gear 32 is rotated
0, the lifting gear 31 is rotated relative to the shank 24, and the fitting position of the protrusion 34 in the spiral groove 33 is forcibly moved. Projection 3
When the insertion position of No. 4 is moved to a predetermined position,
The shank 24 is moved upward in the figure, and the protrusion amount adjusting member 41 is accordingly raised relative to the grindstone 56.
The whetstone 56 is connected to the protrusion amount adjusting member 41 and the whetstone holding member 5
1, and is released from the state of being tightly held by the grinding wheel head 5.

In this manner, in a state where the grindstone 56 is untightened and relaxed in the grindstone head 5, the grip part 15 is operated while looking at the scale part 16 to rotate the worm gear of the grindstone feed mechanism 70, and the transmission differential mechanism A 60A differential internal gear 12 is rotated within the case body 4. When the differential internal gear 12 is rotated, the rotational speed of the rotary arm 6 changes, and accordingly the rotational speed of the transmission gear 21 is also changed. On the other hand, since the grindstone 56 is relatively rotated, the fitting position of the grindstone 56 in the radial guide groove 55 is changed, and the amount of protrusion of the grindstone 56 is adjusted.

After adjusting the amount of protrusion of the grindstone 56, press the handle 3 again.
6, the tightening mechanism 90 is operated to lower the protrusion amount adjusting member 41 toward the grindstone 56 to press the grindstone 56, so that the grindstone 56 is firmly tightened in the grindstone head 5.

This embodiment has the following effects.

Since the rotary drive shaft 1 is connected to the spindle 3 via the Oldham coupling 2, the rotational runout on the rotary drive shaft 1 side is not transmitted to the spindle 3 side, improving grinding accuracy.

During normal operation, the grinding wheel 56 is firmly tightened in the grinding wheel head 5, but when the amount of protrusion of the grinding wheel 56 is being adjusted, the tightening of the grinding wheel 56 is released, so that fine adjustment of the amount of protrusion is possible. This has the effect of being extremely smooth. Moreover, since the grinding wheel 56 is firmly fixed during normal operation other than when adjusting the protrusion amount, there is no risk of vibration occurring in the grinding wheel 56 during grinding, and the grinding accuracy is improved. Lifespan is extended.

Further, since the protrusion amount of the grindstone 56 can be adjusted while the spindle 3 is rotating, that is, while the grinding machine is operating, the workability is excellent.

Further, the differential internal gear 12 is connected to the grindstone feeding mechanism 7.
Since it is rotated by the zero rack part 13 and the worm gear 14, it is easy to operate and make fine adjustments.

In addition, in the above-mentioned embodiment, the rotary drive shaft 1 and the spindle 3 are connected via the Oldham coupling 2, but not only the Oldham coupling but also a universal coupling or vibration-proof rubber can be used. or may be directly connected.

In addition, in the above embodiment, the tightening ring 4
2 and remove the fixing bolt 50, the entire grinding wheel head 5 can be attached to the spindle 3 and the shank 24.
It was structured so that it could be removed from the
The grindstone head 5 does not necessarily have to be removable. However, if the grindstone head 5 can be removed, it becomes possible to replace and use various grindstone heads depending on the purpose of grinding, such as the size of the workpiece.

Furthermore, in the above-described embodiment, the grindstone 56 is directly tightened or released from the one end side of the spindle 3 by raising and lowering the shank 24 based on the locking position of the protrusion 34 in the spiral groove 33. A spring or the like as a biasing means may be provided at any part of the lifting and tightening mechanism 90, and the biasing force of the spring or the like may be utilized when tightening the grindstone 56.

As described above, according to the present invention, there is provided an internal grinding machine in which the amount of protrusion of the grinding wheel can be adjusted easily during operation, and the grinding wheel is firmly fixed at one end of the spindle except when adjusting the amount of protrusion of the grinding wheel. can be provided.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the configuration of an embodiment of an internal grinding machine according to the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, and Fig. 3 is a main part of the grindstone head of the embodiment. FIG. 4 is an exploded perspective view showing the shape of the grindstone holding member in the embodiment. 1...Rotation drive shaft, 2...Oldham coupling,
3...Spindle, 4...Case body as a fixed part,
6... Rotating arm, 7... Planetary shaft, 8, 9, 10... First, second, third planetary gears, 11... Drive gear, 1
2... Differential internal gear, 13... Rack, 14... Worm gear, 21... Transmission gear, 22... Fixed internal gear, 24... Shank, 32... Tightening internal gear, 36
...Handle, 41...Protrusion amount adjustment member, 44...Feed groove as a feed section, 51...Wheelstone holding member, 56...Wheelstone, 60...Transmission differential mechanism, 70...Wheelstone feed mechanism,
90...Elevating and lowering tightening mechanism.

Claims (1)

[Scope of Claims] 1. A spindle rotatably supported by a fixed part and connected to a rotational drive shaft; a plurality of grindstones arranged at one end of the spindle and movable along the radial direction of the spindle; A feeding portion is formed in which a plurality of grinding wheels are engaged directly or indirectly, and the amount of protrusion of the grinding wheels can be adjusted by rotating with respect to the spindle, and the feeding portion moves along the centerline direction of the spindle. a possible protrusion amount adjustment member, a driving gear fixed to a predetermined position of the spindle, a plurality of planetary shafts and driving gears that are rotatably supported around the spindle and arranged on a virtual circumference around the spindle. a first planetary gear meshed with and rotatably supported on each planetary shaft; a differential internal gear meshed with the first planetary gear and rotatably supported on the fixed part; A grindstone feeding mechanism capable of rotating a gear, a fixed internal gear fixed to a fixed part, a second planetary gear meshed with the fixed internal gear and rotatably supported by each planetary shaft, and a second planet. A transmission gear meshed with the gear and rotatably supported around the spindle, and a transmission gear inserted through the transmission gear so as to be movable only in a direction along the centerline of the spindle and integrally provided with the protrusion amount adjusting member. A transmission differential mechanism that has a protrusion and rotates the protrusion adjustment member in synchronization with the spindle, and moves the protrusion adjustment member relative to the spindle by rotating a differential internal gear using a grindstone feeding mechanism. and an elevating gear rotatably supported around the spindle and having a spiral groove in which the tips of the protrusions are fitted into the inner surface, meshed with the elevating gear and rotatably supported on each of the planetary shafts. a third planetary gear, a tightening internal gear meshed with the third planetary gear and rotatably supported by the fixed part; and by rotating the tightening internal gear, the protrusion amount can be adjusted. Move the adjustment member along the center line direction of the spindle,
The grinding wheel is equipped with an elevating and tightening mechanism that tightens or loosens the grinding wheel toward one end of the spindle, and is configured so that the grinding wheel can be tightened and loosened while the spindle is rotating, and the amount of protrusion can be adjusted without mutual interference. Features: Internal grinding machine. 2. The internal grinding machine according to claim 1, wherein the spindle is connected to a rotational drive mechanism via an Oldham coupling.