JPH09201767A - Grindstone driving device - Google Patents

Abstract

(57) An object of the present invention is to provide a grindstone driving device which is small and has a desired rigidity. SOLUTION: A grinding wheel 1 in which a support shaft 12 is integrally provided.
4 and both sides of the grinding wheel 14 and the support shaft 1
First and second timing belts 1 for rotating 2
Transmission means 20 having 6, 18 and said first and second
First and second hydrostatic bearings 22 and 24 that rotatably support the support shaft 12 outside the timing belts 16 and 18 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a whetstone drive device for rotating a whetstone wheel by a transmission means.

[0002]

2. Description of the Related Art Generally, a grinding wheel is widely used for grinding a spline groove (inner groove) formed on the inner peripheral surface of a cylindrical work. As a grindstone drive device using this type of grindstone wheel, for example, Japanese Examined Patent Publication No. 5-2457 (hereinafter,
As disclosed in (Conventional Example 1), by inserting and holding a grindstone support member that supports a grindstone through a connection port of a holding member, a pulley provided at a base end of the grindstone support member contacts a drive belt. Devices that are configured to be articulated are known.

Further, as disclosed in Japanese Utility Model Publication No. 63-48375 (hereinafter referred to as Conventional Example 2), the supporting shaft of the grinding wheel is supported at both ends by ball bearings, and a pair is provided on both sides of the grinding wheel. A device provided with a belt is known.

[0004]

However, in the above-mentioned conventional example 1, although the grindstone replacement work is easily performed, the grindstone is supported by the cantilever structure via the rotating shaft. Therefore, it has been pointed out that a sufficient rigidity cannot be ensured for the support structure of the grindstone.

Further, in the above-mentioned conventional example 2, since a pair of belts are provided on both sides of the grinding wheel, it is possible to have a desired rigidity, but the supporting shaft of the grinding wheel is located outside the belt. Both ends are supported by ball bearings. As a result, the size of the entire apparatus is considerably increased, and there is a problem that it is not suitable for machining the inner groove of the cylindrical work. At that time, it is conceivable to reduce the shaft diameter of the support shaft of the grinding wheel, but there is a problem that the bearing rigidity is significantly reduced.

[0006] The present invention solves this kind of problem, and an object of the present invention is to provide a grindstone drive device which is small and has a desired rigidity.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a transmission means including a pair of timing belts is arranged on both sides of a grinding wheel integrally provided with a support shaft, Since the grindstone wheel is rotationally driven via the transmission means, the transmission power can be surely improved. Moreover, since the support shaft is rotatably supported by the hydrostatic bearing, the support shaft can be set to have a larger diameter than that using a ball bearing, and the bearing rigidity is effectively improved.

The hydrostatic bearing is supplied with filtered grinding fluid. As a result, it becomes possible to easily and surely supply clean grinding fluid to the grinding portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of a grindstone driving device 10 according to an embodiment of the present invention. This grindstone drive device 10 includes a grindstone wheel 14 integrally provided with a support shaft 12.
And the support shaft 12 disposed on both sides of the grinding wheel 14.
And second timing belt 1 for rotating and driving
Transmission means 20 having 6, 18 and said first and second
First and second hydrostatic bearings 22 and 24 that rotatably support the support shaft 12 outside the timing belts 16 and 18 are provided.

The transmission means 20 comprises a drive shaft 26 which is rotationally driven via a rotary drive source (not shown).
6 is rotatably supported in the apparatus main body 28 by a plurality of bearings 30. First and second drive side pulleys 32, 34 are fixed to the drive shaft 26.
One ends of the first and second timing belts 16 and 18 are engaged with the drive pulleys 32 and 34. The first and second timing belts 16 and 18 are arranged in the direction of arrow A from the device main body 28.
Is arranged along the arm portion 36 extending in the direction,
The other end sides of the first and second timing belts 16 and 18 engage with the grinding wheel 14 rotatably supported on the tip end side of the arm portion 36.

The arm portion 36 is provided with a grinding liquid supply passage 38, one end of the supply passage 38 is opened to the outside, and the other end of the supply passage 38 is branched to make first and second circumferences. It communicates with the grooves 40 and 42.

As shown in FIG. 2, the grinding wheel 14 is provided with a grinding portion 44 having a predetermined grinding range on a peripheral surface having a semicircular cross section, and one end side of the grinding portion 44 extends from the outer peripheral surface of the arm portion 36 in a diameter outward direction. Project to. The support shaft 12 is integrally formed on both sides of the grinding wheel 14 so as to project therefrom. The support shaft 12 is formed in a hollow shape having a through hole 46 in the axial direction.
The inner wall surface 46a constituting 6 is inclined so as to expand in diameter from both end sides toward the center side.

A plurality of holes 48 and 50 are provided in the diameter direction of the support shaft 12 so as to communicate with the small diameter side of the through hole 46. The grinding wheel 14 is provided with a plurality of supply holes 52 extending in the diametrical direction, opened to the outside at the top of the grinding portion 44, and communicating with the large diameter portion side of the through hole 46.

First and second driven pulleys 54 and 56 are fixed to the support shaft 12 in the vicinity of both side surfaces of the grinding wheel 14, and the first and second driven pulleys 54 and 56 are firstly attached to the pulleys 54 and 56.
And the other end sides of the second timing belts 16 and 18 are engaged.

The first hydrostatic bearing 22 has a radius bearing portion 60 which communicates with the first circumferential groove 40 via a passage 58, and the first hydrostatic bearing 22.
Thrust bearing portion 6 communicating with the circumferential groove 40 via the passage 62.
4 is provided. The radius bearing portion 60 has a circumferential groove formed around one axis of the support shaft 12, and the thrust bearing portion 6
4 has a peripheral groove formed around the side surface of the first driven pulley 54.

The second hydrostatic bearing 2 communicating with the second circumferential groove 42 side.
4 is configured similarly to the first hydrostatic bearing 22 described above,
The same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 3, the grinding liquid circulating circuit 70 which constitutes the grindstone driving device 10 is provided with a grinding liquid storage tank 72, and one end of a supply pipe line 74 is arranged in the grinding liquid storage tank 72. At the same time, the other end of the supply conduit 74 communicates with the supply conduit 38 of the arm portion 36. A pump 76 and a pressure reducing valve 78 are arranged along the supply line 74.

A grinding liquid collecting member 80 is provided below the arm portion 36, and a discharging liquid tank 84 is arranged at an end portion of a discharging pipe line 82 connected to a lower portion of the grinding liquid collecting member 80. One end of the delivery pipe line 86 is arranged in the discharge liquid tank 84, while the other end of the delivery pipe line 86 is arranged in the grinding liquid storage tank 72. A pump 88 and a filter 90 are provided along the delivery pipe 86.

The operation of the whetstone driving device 10 thus constructed will be described below.

First, when the drive shaft 26 is rotationally driven under the action of a rotary drive source (not shown), the first and second drive pulleys 32 and 34 fixed to the drive shaft 26 rotate,
The first and second driven pulleys 54 and 56 rotate integrally with the support shaft 12 via the first and second timing belts 16 and 18 that engage with the first and second drive pulleys 32 and 34. . The rotation of the support shaft 12 causes the grinding wheel 14 to rotate, and the grinding portion 44 of the grinding wheel 14 starts processing the inner groove Wa (see FIG. 2) of the workpiece W.

At this time, the grinding liquid circulating circuit 70 is driven to draw the grinding liquid from the tip of the grinding wheel 14. That is,
By driving the pump 76, the grinding fluid in the grinding fluid storage tank 72 passes through the supply pipeline 74, is decompressed by the decompression valve 78 on the way, and then is introduced into the supply pathway 38 of the arm portion 36. The grinding liquid introduced into the supply passage 38 is
The flow is divided and reaches the first and second circumferential grooves 40, 42.

The grinding fluid that has reached the first circumferential groove 40 passes through the passage 58.
To the radial bearing portion 60 of the first hydrostatic bearing 22 and the thrust bearing portion 64 from the passage 62. On the other hand, the grinding fluid reaching the second circumferential groove 42 is similarly filled in the radius bearing portion 60 and the thrust bearing portion 64 of the second hydrostatic bearing 24.

Therefore, when the grinding wheel 14 rotates, the grinding fluid leaking from the first and second hydrostatic bearings 22 and 24 passes through the holes 48 and 50 of the support shaft 12 to the small diameter side of the through hole 46. To be done. The inner wall surface 46a forming the through hole 46 is
Since the diameter is expanded from both end sides toward the center side, a part of the grinding fluid led to the through hole 46 is transferred to the center side of the through hole 46 on the negative pressure side (see arrow in FIG. 2). ).
Then, the grinding liquid reaches the top of the grinding portion 44 from the plurality of supply holes 52 communicating with the larger diameter side of the through hole 46, and is supplied from the top to the grinding portion (inner groove Wa) of the workpiece W.

The used grinding fluid discharged from the first and second hydrostatic bearings 22 and 24 is recovered by a grinding fluid recovery member 80, and a discharge conduit 82 connected to the lower portion of the grinding fluid recovery member 80. Is introduced into the discharged liquid tank 84. The grinding liquid in the discharge liquid tank 84 is returned to the grinding liquid storage tank 72 through the delivery pipe line 86 under the action of the pump 88, and the chips and the like in the grinding liquid are removed by the filter 90 along the way. To be done.

In this case, in this embodiment, the first and second timing belts 16 and 18 are arranged on the support shaft 12 which is integrally provided on both sides of the grinding wheel 14, and the first and second timing belts 16 and 18 are arranged. The grinding wheel 14 is rotationally driven via the timing belts 16 and 18. For this reason, it becomes possible to obtain a high transmitted power as compared with the case where a single timing belt is used.

Further, in this embodiment, the support shaft 12 is rotatably supported by the first and second hydrostatic bearings 22 and 24. As a result, the maintenance work can be simplified and the support shaft 12 can be set to a large diameter without increasing the overall size, as compared with the conventional ball bearing. Therefore, the effect of effectively improving the bearing rigidity can be obtained.

The first and second hydrostatic bearings 22 and 24 are also provided.
Is supplied with the grinding fluid filtered through the filter 90. As a result, it becomes possible to easily and reliably supply the grinding liquid to the grinding portion, and the drain circuit is not required, so that the space can be saved, and the chips and the like can be applied to the first and second static pressures. It is possible to reliably prevent the bearings 22 and 24 from being brought into the bearings.

In addition, the conventional ball bearing has a problem that its life is shortened by cutting fluid, chips, etc., but in this embodiment, the first and second hydrostatic bearings 22, 2 are used.
Since No. 4 is used, it can be effectively used for a long period of time without being affected by the cutting fluid or the like.

[0029]

In the grindstone drive device according to the present invention, the transmission means including the pair of timing belts are arranged on the support shafts integrally provided on both sides of the grinding wheel, and the grindstone is transmitted through the transmission means. Since the vehicle is driven to rotate, the transmission power can be surely improved. Moreover, since the support shaft is rotatably supported by the hydrostatic bearing, the support shaft can be set to have a larger diameter than that using a ball bearing, and the bearing rigidity is effectively improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a grindstone drive device according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an explanatory diagram of a grinding fluid circulation circuit of the grindstone driving device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Whetstone drive device 12 ... Support shaft 14 ... Whetstone wheel 16, 18 ... Timing belt 20 ... Transmission means 22, 24 ... Static pressure bearing 32, 34 ... Drive side pulley 36 ... Arm part 38 ... Supply paths 40, 42 ... Circumference Groove 44 ... Grinding portion 46 ... Through hole 48, 50 ... Hole portion 52 ... Supply hole 54, 56 ... Driven side pulley 58, 62 ... Passage 60 ... Radius bearing portion 64 ... Thrust bearing portion 70 ... Grinding fluid circulation circuit 72 ... Grinding Liquid storage tank 74 ... Supply lines 76, 88 ... Pump 84 ... Discharged liquid tank 90 ... Filter

Claims (2)

[Claims] 1. A grinding wheel integrally provided with a support shaft, a transmission means having a pair of timing belts arranged on both sides of the grinding wheel and rotationally driving the support shaft, and outside the timing belt. A grindstone drive device comprising: a hydrostatic bearing that rotatably supports the support shaft; 2. The grindstone driving device according to claim 1, wherein the hydrostatic bearing is supplied with filtered grinding fluid.