JPH08247154A - Lubricating cooling device for spindle - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a lubrication cooling device capable of simply controlling the amount of lubricating oil in the bearing and the amount of cooling oil in the main shaft. [Structure] In an annular space 1D between a drawing bar 2 inserted in a spindle hole and a spindle hole wall 1E, a separator cylinder 5 for separately bearing a bearing support region BS and a support shaft region SS of a spindle is installed. . Through holes 5C and 5D for feeding the fluid C for lubrication and cooling are opened in the respective cylinder walls of the separator cylinder 5 facing the bearing support region and the support shaft region, and the main shaft 1 is extended from the through holes in the bearing support region. The communicating hole 1F formed in the main shaft is connected to the formed through hole 5C, and the through holes 3A, 4A formed in the inner rings of the bearings 3, 4
And a lubrication cooling device for the main shaft, which is connected to the inner peripheral surface of the main shaft from the through hole 5D in the support shaft region SS.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to underrace lubrication of a main shaft bearing of a machine tool and cooling of the main shaft, and more particularly, to simplify control of the amount of lubricating oil in the bearing and the amount of cooling oil in the main shaft. Related to the lubrication cooling device for the spindle.

[0002]

2. Description of the Related Art Conventionally, underrace lubrication of a main shaft bearing of a machine tool has a hollow portion inside a rotary shaft with respect to a bearing mounted on the outer peripheral side of the rotary shaft, as seen in JP-A-4-228922. The one that supplies lubricating oil has been proposed. This under-race lubrication sends a large amount of lubricating oil from the outside to the hollow shaft of the rotating shaft, penetrating radially from the hollow part of the rotating shaft to the bearing, and excess lubricating oil from the gap of the sending part. It was designed to be collected. Therefore, the hollow part of the rotating shaft is always filled with lubricating oil, so for all bearings that support this rotating shaft,
The lubricating oil can be supplied uniformly and sufficiently regardless of the axial position.

[0003]

However, according to the underlace lubrication disclosed in the above-mentioned JP-A-4-60281,
Since the lubricating oil supply pipe is arranged with a gap at the tail end of the hollow part of the rotating shaft, it is easy for crossing to occur in this gap, and core runout is generated at this crossing, and it adapts to the main shaft of high-speed rotation. There is a problem that you cannot do it. This phenomenon adversely affects the feeding accuracy of the lubricating oil and cannot evenly supply the lubricating oil. Further, the cooling effect of the bearing portion of the main shaft is not sufficiently exerted.

In view of the problems of the above-mentioned conventional underlace lubrication device, the present invention provides a lubrication cooling device which can simply control the amount of lubricating oil in the bearing and the amount of cooling oil in the main shaft. With the goal.

[0005]

In order to achieve the above object, the present invention provides a bearing support region for a spindle in an annular space defined by a drawing bar inserted into a spindle hole and a wall of the spindle hole. And a support cylinder region and a separator cylinder for separately supporting them are internally provided, and through holes for feeding a fluid for lubrication and cooling are formed in each cylinder wall of the separator cylinder facing the bearing support region and the support shaft region. The through hole in the bearing support region is connected to the through hole formed in the main shaft, the through hole formed in the main shaft is connected to the through hole formed in the inner ring of the bearing, and the through hole in the support shaft region is connected to the main shaft. The spindle cooling and cooling device is characterized in that it is connected to the inner peripheral surface and connected to the tail end side of the spindle.

In the lubrication cooling device for a spindle according to claim 1, the bearing lubricating oil amount and the spindle cooling oil amount are determined by the total sectional area of the through holes in the bearing support region and the total sectional area of the through holes in the support shaft region. A lubrication cooling device for a main shaft, characterized in that a supply amount is set.

In the lubrication cooling device for a spindle according to claim 1, at least the positional relationship between the through hole formed in the main shaft and the through hole formed in the inner ring of the bearing is circumferentially displaced and communicated. It is a characteristic spindle cooling and cooling device.

In the annular space between the drawing bar inserted in the spindle hole and the wall of the spindle hole, a support cylinder for supporting the bearing support area of the spindle is provided, and the cylinder of the support cylinder facing the bearing support area. A through hole for feeding the fluid for lubrication and cooling is opened in the wall to connect the through hole in the bearing support area to the through hole formed in the main shaft, and at least the through hole formed in the main shaft and the inner ring of the bearing. The lubrication cooling device for the main shaft is characterized in that the positional relationship with the through hole is displaced in the circumferential direction to communicate with each other.

[0009]

According to the present invention, a through hole is formed in each cylinder wall of the separator cylinder facing the bearing support area of the main shaft and the support shaft area, and a fluid for lubrication and cooling is provided in the through hole of the separator cylinder. When fed, this lubricating and cooling fluid will
From the through hole of the separator cylinder, the through hole of the bearing support region and the through hole of the main shaft are communicated with the through hole of the inner ring of the bearing. Then, the inner ring and balls of this bearing are lubricated and cooled. The cooling fluid sent from the through hole in the support shaft region into the inner peripheral surface of the main shaft is discharged from the tail end of the main shaft after cooling the main shaft from its inner peripheral wall.

Further, the setting of the supply amount of the bearing lubricating oil amount and the spindle cooling oil amount is determined by the total cross-sectional area of the through hole in the bearing support region and the total cross-sectional area of the through hole in the support shaft region. Cooling and lubrication flow rate control can be implemented simply.

Since the positional relationship between the through hole formed in the main shaft and the through hole formed in the inner ring of the bearing is circumferentially displaced, the moving path of the fluid for lubrication and cooling becomes long, By this amount, the cooling time and cooling action for the main shaft and the inner ring of the bearing are effectively exerted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described below. FIG. 1 is a vertical cross-sectional view showing an entire underrace lubrication cooling device for a main shaft bearing of a machine tool according to the present invention.
[Fig. 3] is a cross-sectional view of a main part according to the present invention.

First, in FIG. 1, the main shaft 1 is supported at its tip end side by two bearings 2 and 3, and although not shown, the rear end side is also supported by the bearings. Furthermore,
Although not shown, the main shaft 1 has a rotor of a built-in motor fitted in the middle abdomen thereof, and a multi-layer disc spring and a drawing bar 2 are installed in the inner peripheral hole 1A opened at the shaft center position, and the main shaft tip The tool inserted in the taper hole 1B is strongly pulled in and fitted. An unclamping device is provided at the rear end of the drawing bar 2, and when the drawing bar 2 is advanced to the drawing bar side, the drawing bar is strongly pushed out to perform the unclamping operation.

The tail end hole portion 1C of the main shaft 1 is supplied with a cooling lubricating liquid C for cooling the shaft core of the main shaft 1 and underrace lubrication of the bearings 2 and 3. Then, in the annular space 1D between the drawing bar 2 inserted through the tail end hole portion 1C and the hole wall 1E of the main shaft, a separator cylinder for separately bearing the bearing support region BS and the support shaft region SS of the main shaft 1. It has 5 interiors. The bearing support area BS
Further, through holes 5C and 5D for feeding the cooling lubricating liquid C for lubricating and cooling are provided in the respective cylinder walls 5A and 5B of the separator cylinder 5 facing the support shaft region SS. The through holes 5C of the bearing support area BS are connected to the through holes 1F formed in the main shaft 1, and the through holes 1F are connected to the through holes 3A, 4A formed in the inner rings of the bearings 3, 4.

On the other hand, the through holes 5D ...
Is connected to the hole wall 1E, which is the inner peripheral surface of the main shaft 1,
A circulation path is formed such that the cooling lubricating liquid C is sent from the inner peripheral surface 1E to the tail end side of the spindle.

The lubricating and cooling device for a main shaft according to the present invention is constructed as described above and operates as follows. First, a part of the cooling lubricating liquid C that has flowed into the annular space 1D of the main shaft 1 is subjected to underrace lubrication of the bearings 2 and 3 arranged in the bearing support region BS so that the through hole 5 of the separator cylinder 5 can be used.
From C, 5D to the inner peripheral surface 1E of the spindle. Here, the cooling lubricant C reaches the through holes 3A, 4A formed in the inner rings of the bearings 3, 4 from the front and rear through holes 1F while cooling the main shaft of the bearing support region BS. As a result, a part of the cooling lubricating liquid C is subjected to underlace lubrication, and the cooled lubricating liquid C is discharged from the drain passage 12A on the main shaft stationary machine frame 12 side.

On the other hand, the cooling lubricating liquid C is also supplied to the through hole 5D in the support shaft region SS. From here, the cooling lubricant C whose flow rate is controlled by the cross-sectional area of the through hole 5D is supplied to the hole wall 1E which is the inner peripheral surface of the main shaft 1, and the main shaft is cooled while being sent from the inner peripheral surface 1E to the tail end side of the main shaft. This relationship is shown in FIG. That is, the cooling lubricating liquid C is limited to the flow rate CB in the hole wall 1E of the main shaft 1 by the cross-sectional area of the through hole 5D, and cools the main shaft 1 in the bearing support region BS from the front and rear through holes 1F to the bearings 3 and 4. The flow rate CA is limited by the cross-sectional area of the through holes 3A and 4A formed in the inner ring and reaches the flow rate CA.

Next, a second embodiment of the present invention will be described with reference to FIGS. The bearing 3 (4) that supports the main shaft 1 in the bearing support region BS has a plurality of through holes 3A on the inner ring side.
Are drilled at 90 degree intervals. Bearing 3 (4) above
A plurality of through holes 1F are formed at 90-degree intervals on the outer periphery of the main shaft 1 that fits together with, and a connecting groove 1R is formed in a ring shape. As shown in FIG. 4, the through holes 3A and 1F are displaced by 45 degrees in the circumferential direction from the phase θ1 of the positional relationship.

According to the lubricating and cooling device for a main shaft of the second embodiment, however, the positional relationship between the through holes 1F formed in the main shaft 1 and the through holes 3A, 4A formed in the inner rings of the bearings 3, 4 is shown. Is displaced by the phase angle θ1 in the circumferential direction, the moving path of the fluid C for lubrication and cooling becomes long, and the cooling time and the cooling action for the main shaft 1 and the inner rings of the bearings 3 and 4 become effective. The action of working is performed.

The present invention is not limited to the above-mentioned embodiment, but the design of the essential structure can be changed. For example, the through hole 5 of the separator tube 5
C, 5D and through hole 1F opened in the main shaft 1 and bearing 3,
Change the number of the through holes 3A and 4A of 4 and the cross-sectional area thereof appropriately. Further, a support cylinder for supporting a bearing support area of the main shaft is provided in an annular space between the drawing bar inserted in the main spindle hole and the main shaft hole wall, and a cylinder wall of the support cylinder facing the bearing support area. Alternatively, a structure may be adopted in which a through hole for feeding a fluid for lubrication and cooling is opened and the through hole formed in the bearing support region BS is connected to the through hole formed in the main shaft.

[0021]

According to the present invention, a through hole formed in each cylinder wall of the separator cylinder facing the bearing support area and the support shaft area of the main shaft is provided, and a fluid for lubrication and cooling is fed into the through hole of the separator cylinder. The effect of lubricating and cooling the inner ring and balls of the bearing is achieved by communicating with the through hole formed in the bearing support region and the through hole formed in the main shaft from the through hole of the separator cylinder to the through hole formed in the inner ring of the bearing. There is. Further, the cooling fluid sent from the through hole in the support shaft region into the inner peripheral surface of the main shaft cools the main shaft from the inner peripheral wall thereof.
It also has the effect of exerting one function at a time.

Furthermore, the setting of the supply amounts of the bearing lubricating oil amount and the spindle cooling oil amount is determined by the total cross-sectional area of the through holes in the bearing support region and the total cross-sectional area of the through holes in the support shaft region. There is an effect that the cooling and the lubrication flow rate can be simply controlled.

Since the positional relationship between the through hole formed in the main shaft and the through hole formed in the inner ring of the bearing is displaced in the radial direction, the moving path of the fluid for lubricating and cooling becomes long,
The cooling time and the cooling action for the main shaft and the inner ring of the bearing are effectively exerted by this amount.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view showing an underrace lubrication method for a main shaft bearing and the like according to the present invention.

FIG. 2 is an enlarged sectional view of the first embodiment according to the present invention.

FIG. 3 is a sectional view of an essential part of a second embodiment according to the present invention.

FIG. 4 is an enlarged cross-sectional view of a second embodiment according to the present invention.

FIG. 5 is an explanatory diagram showing a flow of a cooling lubricating liquid according to the present invention.

[Explanation of symbols]

1 Spindle 1E Spindle tail end hole 3,4 Bearing 3A, 4A Inner ring 2 Drawing bar 1F, 3A, 4A, 5C, 5D Through hole 5 Separator cylinder BS Bearing support area SS Support shaft area C Cooling lubricant θ1 Phase angle

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Haruo Yamashita Inventor Haruo Yamashita 4888 Takatsukacho, Hamamatsu City, Shizuoka Enshu Corporation

Claims (4)

[Claims] 1. A separator cylinder for separately supporting a bearing support region of a main shaft and a support shaft region is provided in an annular space between a drawing bar inserted through the main shaft hole and a wall of the main shaft hole, and the bearing support is provided. A through hole for feeding a fluid for lubrication and cooling is opened in each cylinder wall of the separator cylinder facing the area and the support shaft area, and is communicated with the through hole formed in the main shaft from the through hole of the bearing support area, The through hole formed in the main shaft is communicated with the through hole formed in the inner ring of the bearing, and the through hole in the support shaft region is communicated with the inner peripheral surface of the main shaft to be connected to the tail end side of the main shaft. Lubricating cooling device for the spindle. 2. The lubrication cooling device for a spindle according to claim 1, wherein the bearing lubricating oil amount and the spindle cooling oil are determined by the total sectional area of the through holes in the bearing support region and the total sectional area of the through holes in the support shaft region. Lubricating cooling device for a spindle, characterized by setting the amount of supply. 3. The spindle cooling and cooling device according to claim 1, wherein at least the through hole formed in the main shaft and the through hole formed in the inner ring of the bearing are displaced in the circumferential direction to communicate with each other. Lubricating and cooling device for a spindle, which is characterized in that 4. A support cylinder for supporting a bearing support area of the main shaft is housed in an annular space between a drawing bar inserted through the main shaft hole and the wall of the main spindle hole, and the support cylinder facing the bearing support area. A through hole for feeding a fluid for lubrication and cooling is opened in the cylindrical wall of the above, and the through hole formed in the bearing supporting area is connected to the through hole formed in the main shaft, and at least the through hole formed in the main shaft and the inner ring of the bearing. A lubricating and cooling device for a spindle, characterized in that a positional relationship with a through hole drilled in the main shaft is communicated by displacing in a circumferential direction.