JP4589149B2 - Ball screw device with lubricating oil supply device - Google Patents

Description

  The present invention relates to a ball screw device with a lubricating oil supply device having a function capable of continuously supplying lubricating oil to a transfer path of a screw shaft for a long period of time.

  The ball screw device is used for a high load part such as a drive shaft of an injection molding machine, for example. In order to suppress damage to the rolling elements, grease as a lubricant is periodically supplied or electric grease is used. The automatic grease lubrication device using a pump supplies grease into the nut of the ball screw device. However, when supplying grease from a specific place, it is necessary to supply a large amount of grease so that the grease rotates around the entire nut. As a result, there has been a problem that the surroundings are soiled by the scattering of grease when the screw shaft rotates. There is also a problem that the cost of the automatic grease lubrication device is very expensive.

Therefore, a ball screw device incorporating a grease supply device has been provided (Japanese Patent Laid-Open No. 2003-232427). In this apparatus, a grease supply unit is incorporated directly into the nut, and the grease is supplied from the grease supply unit to the rolling path of the rolling element. As a result, the grease can be supplied in the immediate vicinity of the rolling path that requires the grease, so that the excessive supply of the grease becomes unnecessary and the above-mentioned problems are eliminated. However, when the grease in the grease supply unit is consumed and needs to be replaced, it is necessary to remove the nut together with the return pipe incorporated in the nut because the grease supply unit is directly incorporated in the nut. There was a problem that the exchange of was very troublesome.
JP2003-232427

  It is an object of the present invention to develop a ball screw device with a lubricating oil supply device having a structure capable of easily replacing such a grease supply unit.

The invention described in claim 1
(a) a screw shaft (3) formed on the outer periphery with a spiral transfer groove (2) on which the rolling element (1) rolls;
(b) a nut (6) formed with a spiral guide groove (5) that forms a transfer path (4) that is paired with the transfer groove (2) and forms a path of the rolling element (1);
(c) a plurality of the rolling elements (1) that roll in the transfer path (4) and carry a load;
(d) provided on the nut (6), one end opened to the transfer path (4) and the other end opened to another position in the transfer path (4) so that the rolling elements (1) can circulate A parallel return pipe (7),
(e) an oil supply section (9) attached to the outer peripheral surface of the nut (6) and having lubricating oil (8) stored therein;
(f) Supply the lubricating oil (8) of the oil supply section (9) to the transfer path (4) through the through hole (10) provided in the nut (6) between the adjacent return pipes (7). Formed with the lubricating oil supply section (11) ,
(g) The lubricating oil supply part (11) has one end inserted into the oil supply part (9) so that the allowance from the oil supply part (9) can be adjusted, and the other end is screw shaft (3 ) In contact with the rolling groove (2) of the ball screw device with a lubricating oil supply device.

  According to a second aspect of the present invention, the oil supply section (9) can be attached and detached together with the lubricating oil supply section (11) from the outer peripheral surface of the nut (6).

  The oil supply section (9) of the present invention is attached to the outer peripheral surface of the nut (6) so that the lubricating oil (8) stored inside is supplied to the transfer path (4) by the lubricating oil supply section (11). However, since the lubricating oil supply part (11) is inserted into the through hole (10) provided in the nut (6), the oil supply part (9) can be removed from the nut (6) at the time of replacement. The lubricating oil supply section (11) can also be removed, and the oil supply section (9) can be replaced very easily.

  Hereinafter, the present invention will be described in detail according to illustrated embodiments. In FIG. 1, the ball screw device includes a screw shaft (3), a nut (6), a return pipe (7), a rolling element (1), and an oil supply part (9) having a lubricating oil supply part (11). . A bearing (20) is mounted in a cantilever manner on the journal portion (3a) of the screw shaft (3), and a pulley (21) is mounted on the protruding end portion (3b). On the other hand, a spiral transfer groove (2) formed with a constant lead is formed on the outer periphery of the operating portion (3c) of the screw shaft (3) so that the rolling element (1) rolls. It has become.

  The nut (6) has a substantially cylindrical shape, and a flange (12) for mounting a ball screw device machine (in this embodiment, an injection molding machine) is provided on an end surface of the nut (6). The diameter and the axial length of the nut (6) are determined according to the load to be received. A spiral guide groove (5) that forms a transfer path (4) that is paired with the transfer groove (2) of the screw shaft (3) and serves as a path of the rolling element (1) is provided in the nut (6). It is formed on the peripheral surface.

  A part of the top surface of the nut (6) is cut off to form a flat surface portion (13), and a rectangular return pipe mounting portion (13a) is further attached in the axial direction. Then, the return pipe mounting portion (13a) is horizontally inserted so that the central portion of the gate-shaped return pipe (7) is inclined with respect to the screw shaft (3), and the opening is further opened to the screw shaft (3). Open to the transfer groove (2). One end of the return pipe (7) is opened to one transfer path (4) so that the rolling element (1) can circulate in the transfer path (4), and the other end is transferred to other lines separated by multiple lines. The rolling element (1) smoothly flows through the return pipe (7) and flows into the other transfer path (4). The return pipe (7) is made of resin, and its opening is particularly easily damaged. The return pipe (7) is arranged in parallel at a plurality of locations according to the nut (6).

  A large number of rolling elements (1) are inserted in the transfer path (4) formed between the nut (6) and the screw shaft (3), and the circulation path (transfer path ( 4) from the return pipe (7) opened at the end of the rolling element (1) between a part and a part away from the several strips), the return pipe (7) ) Through the outlet of the circulation path [the other transfer path (4) where the opening of the return pipe (7) is open], and is composed of the transfer path (4) and the return pipe (7). The rolling element (1) circulates in the path in accordance with the rotation of the screw shaft (3). The return pipe mounting portion (13a) of the nut (6) has a through hole (10) that penetrates the nut (6) between the adjacent return pipes (7).

  A gate-type oil supply section (9) is disposed so as to straddle the return pipe mounting section (13a). The oil supply section (9) includes a casing body (9b), lids (9a) (9c) disposed on both sides of the casing body (9b), and mounting members (9d) provided on the bottom surface of the casing body (9b). ) And a lubricating oil supply part (11) attached through. The allowance of the lubricating oil supply section (11) from the mounting member (9d) can be adjusted. The casing body (9b) is filled with a lubricating oil occlusion body (15) impregnated with a lubricating oil (8). The property of the lubricating oil occlusion body (15) may be anything as long as it occludes the lubricating oil (8) sufficiently and releases it using capillary action, and a porous body such as felt or sponge is used. . At both lower ends of the oil supply section (9), the lubricating oil supply section (11) and the oil supply section (9) can be attached to and detached from the outer peripheral surface of the nut (6) (16) (16) Is provided.

  The insertion end of the lubricating oil supply section (11) is in contact with the lubricating oil occlusion body (15), and the lubricating oil (8) is gradually supplied from this contact portion to the lubricating oil supply section (11). It has come to be. The lubricating oil supply section (11) is made of a hard felt or a porous material such as sponge similar to the lubricating oil occlusion body (15).

  As shown in FIG. 2, the oil supply section (9) is mounted so as to straddle the return pipe mounting section (13a) provided on the upper surface of the nut (6), and the lubricating oil supply section (11) is connected to the nut. Without overloading the rolling element (1) passing through the transfer path (4) through the through hole (10) provided in (6) and contacting the rolling groove (2) of the screw shaft (3). Supply lubricating oil (8). The oil supply section (9) is appropriately selected according to the length of the nut (6). In the case of FIG. 1, four oil supply portions (9) are arranged in parallel, and are screwed to the side surface of the nut (6) by an attachment portion (16).

  When the ball screw device is driven in this state, the screw shaft (3) moves relative to the nut (6) in accordance with the rotation of the screw shaft (3) (in this embodiment, the screw shaft (3) moves). In accordance with this, the rolling element (1) rolls in the transfer path (4), and the lubricating oil (8) passes through the lubricating oil supply part (11) from the lubricating part (9) to the rolling groove (2 ) And the lubricating oil (8) is applied to the rolling elements (1) passing through the transfer path (4) without overload.

  When the lubricating oil (8) in the oil supply section (9) is consumed, it is replaced with a new oil supply section (9). First, when the screw of the mounting portion (16) is removed, the lubricating oil supply portion (11) comes out from the through hole (10) of the nut (6), and comes off from the nut (6) together with the oil supply portion (9). And it replaces | exchanges for a new oil supply part (9). In this way, the oil supply section (9) can be replaced simply by attaching and detaching the screw of the mounting section (16).

  Since the present invention has a structure that allows the grease supply unit to be easily replaced, the use of the ball screw device is further simplified, and the maintainability of the machine using the ball screw device is greatly improved.

It is a top view of one example of the present invention. It is sectional drawing of FIG. It is a disassembled perspective view of the oil supply part of FIG.

Explanation of symbols

(1) Rolling element
(2)… Transfer groove
(3)… Screw shaft
(4)… Transfer path
(5)… Guide groove
(6)… Nut
(7)… Return pipe
(8)… Lubricant
(9)… Refueling part
(10) ... Through hole
(11)… Lubrication oil supply part

Claims (2)

A screw shaft formed on the outer periphery with a spiral transfer groove on which the rolling element rolls ;
It before Symbol transfer groove pair, the nut helical guide groove is formed to form a transfer path for passage of the rolling elements,
A plurality of rolling elements carrying the load by rolling before Symbol transfer path,
Provided in the nuts, a return pipe having one end as the rolling element is capable circulation is opened to the transfer path, the other end is open to another position in said transfer path, which is more parallel,
Attached to the outer peripheral surface of the front Symbol nuts, and oil supply unit which lubricating oil is the oil storage therein,
The lubricating oil of the oil supply portion through a hole provided in the nut in between adjacent contact the return pipe is formed with a lubricating oil supply section for supplying to said transfer path,
One end of the lubricating oil supply unit is inserted into the oil supply unit so that the allowance from the oil supply unit can be adjusted, and the other end is in contact with the rolling groove of the screw shaft. A ball screw device with a lubricating oil supply device.
Lubricating oil supply device with a ball screw device according to claim 1, characterized in that the oil supply portion is adapted to detachably with said lubricating oil supply portion from the outer peripheral surface of the nut.

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