JPH0135560Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cooling device on the flange side of a flange-type rotating electrical machine used for driving the main shaft of a machine tool.

[Conventional technology] Conventionally, in rotating electric machines that have a flange-shaped load-side bracket for attachment to a machine tool, the flange-side bracket is attached directly to the mounting surface of the machine tool, etc., and ventilation in the axial direction is not possible. . For this reason, a cooling ventilation window opened laterally is provided at the load side end of the frame that makes up the outer frame, and a fan attached to the rotating shaft allows cooling air passing through the rotating electric machine to circulate around the load side bearing. The heat of the load-side bearing is cooled and exhausted in the radial direction through the cooling ventilation window, thereby preventing the heat of the rotating electric machine from being transmitted to a machine tool or the like.

[Problems to be solved by this invention] However, in recent years, as machine tools have become faster and more precise, the effects of heat and vibration from rotating electrical machines such as those used to drive the spindle have become more important. As mentioned above, if a ventilation window is provided on the side of the outer frame and ventilation is provided by a cooling fan attached to the rotating shaft, the air volume during low speed rotation is insufficient, and it is not possible to prevent heat transfer to the machine tool. The ventilation windows reduced the mechanical strength of the outer frame, potentially causing vibrations.

[Means for Solving the Problems] In view of these points, the present invention includes a cooling medium passage formed by a concave groove and a cover surrounding the load side bearing in the flange side bracket, and a cooling medium integrated with the bracket in this cooling medium passage. The cooling area is increased by arranging the reinforcing ribs, which are structured in the same way, and the fins, which are integrated with the cover, in a zigzag pattern by arranging them alternately in the circumferential direction, thereby cooling the bearings and insulating heat from the machine tools. In addition to being effective, the strength of the bracket is made greater than that of conventional structures by the reinforcing ribs provided radially integrally with the bracket, thereby preventing vibration.

[Example] The embodiment shown in the figures will be described below.

1 is a frame, 2 is a cooling fin, and 3 is a bracket, which is provided with a bearing housing 4 and a flange 5, and between the bearing housing 4 and flange 5 is an annular groove that opens on one side (load side in the illustrated embodiment). It consists of 6. Reference numeral 7 denotes a cover that closes the opening of the groove 6, and is attached by mounting screws 8 or by welding. Reference numeral 9 denotes a plurality of reinforcing ribs formed radially within the groove and integrally with the bracket, and a gap 10 is provided between the reinforcing ribs and the cover 7 and the ribs are lower than the depth of the groove. Reference numerals 11 and 12 denote a supply port and a discharge port that penetrate the outer circumferential wall of the concave groove, to which refrigerant pipes (not shown) are connected. Reference numeral 13 denotes a plurality of fins attached radially to the inner surface of the cover 7, and the reinforcing ribs 9
A gap 14 is inserted between them and is lower than the depth of the groove and allows a cooling medium to pass between it and the bottom of the groove.

[Function] When a cooling medium, such as cutting oil for the machine tool, is supplied from a coolant pipe attached to the machine tool by the flange 5 of the bracket 3 and connected to the supply port 11, the cutting oil flows into the groove 6 and the reinforcing rib 9. The inside of the groove 6 is divided into both sides as shown by the arrow in FIG. 9 and fins 13, the liquid flows in a zigzag shape in the groove 6, and is discharged from the discharge port 12. During this time, the heat of the bearing housing 4 and the heat transmitted from the inside of the rotating electric machine to the bracket 3 are absorbed and cooled by the cooling medium over a wide contact surface via the inner surface of the groove and the surfaces of the reinforcing ribs and fins.

In addition, since the reinforcing ribs 9 connect the inner walls of the groove 6 and the bottom surface at multiple points radially,
A decrease in mechanical strength due to the provision of a large groove in the bracket 3 is prevented, and the strength is increased instead.

In the above embodiment, the cutting oil of the machine tool is used as the cooling medium, but other cooling mediums such as cooling air, water, lubricating oil, etc. can also be used. The inside of the concave groove is partitioned without providing a gap 10, and a supply port and a discharge port are provided on both sides with this reinforcing rib in between, so that the cooling medium is discharged after making approximately one revolution inside the concave groove. Good too.

In the illustrated embodiment, the groove 6 is opened on the load side of the bracket, but it is clear that the same effect can be obtained even if it is opened on the opposite side or in the direction of the outer circumference. If
A cover bent into a cylindrical shape is provided surrounding this opening,
This cover may be provided with a supply port and a discharge port.

[Effects of the present invention] As described above, the present invention provides a flange-type rotating electric machine that is attached to a machine tool, etc., which has a groove formed in an annular shape surrounding the bearing housing in the flange-side bracket, and which closes the opening of this groove. a cover is provided in the groove, the cover is integrally formed with the bracket and connects both sides of the groove and the bottom, and is provided with a plurality of reinforcing ribs radially lower than the depth of the groove; A plurality of fins are provided radially, the fins are inserted between the reinforcing ribs, a cooling medium passage bent in a zigzag shape is formed in the groove, and the cooling medium is circulated within the groove. be. For this reason, a heat absorption layer is formed to prevent the heat generated in the rotating electric machine by the cooling medium flowing in the groove from being transferred to the machine tool, and an effective cooling effect can be achieved even when the rotating electric machine is at low speed or stopped. As well as eliminating the influence of heat on machine tools,
The multiple reinforcing ribs installed in the groove, together with the fins of the cover, not only increase the cooling area within the groove and improve the cooling effect, but also increase the mechanical strength of the bracket and increase its rigidity. This has the effect of preventing vibrations to the machine tool.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional view of the upper half showing the main parts of the embodiment of the present invention, Fig. 2 is a cross-sectional view of the bracket taken along the line A-A, and Fig. 3 is a developed cross-sectional view taken along the line B-B. . 1 is a frame, 3 is a bracket, 4 is a bearing housing, 6 is a groove, 7 is a cover, 9 is a reinforcing rib,
10 is the space, 11 is the supply port, 12 is the discharge port, 13
is Finn, and 14 is Ma.

Claims (1)

[Scope of utility model registration request] A flange-side bracket of a flange-type rotating electrical machine has an annular groove surrounding a bearing housing, a cover for closing an opening of the groove, a supply port and a discharge port for circulating a cooling medium through the groove, and the groove. A plurality of reinforcing ribs are formed radially integrally with the bracket inside the cover, and a plurality of fins are formed radially integrally with the cover on the inner surface of the cover, and the fins are inserted between the reinforcing ribs to provide the reinforcement. 1. A cooling device for a flange-type rotating electric machine, characterized in that a cooling medium passage is formed in the groove by providing a gap between the rib and the cover and between the fin and the bottom of the groove.