JP6096267B1 - Dust-proof unit used for ball screws - Google Patents

Abstract

A dustproof unit is provided. A dustproof unit is used for a ball screw. Ball screws are composed of screws and nuts. The nut covers the screw. The dustproof unit includes an annular main body and a piece-like elastic valve body. The annular body is disposed at one end of the nut. The screw passes through the annular body. The annular body has a shavings outlet on the outer annular surface. One end of the shaving discharge port communicates with a spiral passage formed between the screw and the nut. The piece-like elastic valve body is disposed at another end of the chip discharge port of the annular main body. When the fluid pushes out the piece-like elastic valve body, the piece-like elastic valve body is pushed out and opens the shavings discharge port, so that the shavings smoothly flow out from the shavings discharge port together with the fluid. With the structure described above, the service life of the ball screw can be increased. [Selection] Figure 1

Description

  The present invention relates to a ball screw, and more particularly to a dustproof unit used for a ball screw.

  When the ball screw is actuated, the screw, nut and ball come into contact with each other by the rolling of the ball, while at the same time they are worn away to produce shavings. If the shavings remaining inside are not removed, the precision of the transmission of the ball screw and the smoothness of the operation will be affected, and the shortening of the life of the ball screw will be accelerated.

  On the other hand, Patent Document 1 posted that the swarf generated inside is sucked by a suction force device. However, the suction force device complicates the overall structure and increases the mounting cost. On the other hand, Patent Document 2 posted that the adhesion force between the dustproof unit lip and the screw is enhanced by a magnet. However, the shavings are sucked into the screw groove and accumulated. Thus, the magnet improves the sealing effect, but on the other hand indirectly increases the resistance force when the entire structure is activated.

US Pat. No. 5,231,888 JP4967809 Publication

  The present invention provides a dust-proof unit that is used for a ball screw and that not only has a simple structure and a good sealing effect, but also effectively removes internal shavings and increases the service life of the ball screw. The main purpose is to provide.

  In order to solve the above-described problems, a dustproof unit according to the present invention includes an annular main body and a piece-like elastic valve body. The annular body is disposed at one end of the nut. The screw passes through the annular body. The annular body has a lip portion formed on the inner annular surface, and at least one shaving discharge port formed on the outer annular surface. The lip portion contacts the outer peripheral surface of the screw. One end of the shaving discharge port communicates with a spiral passage formed between the nut and the screw. The piece-like elastic valve body is connected to the annular main body and disposed at another end of the chip discharge port of the annular main body.

  When the piece-like elastic valve body receives the pressure of the fluid and opens the shavings discharge port, the shavings flow out from the shavings discharge port together with the fluid. When the pressure of the fluid is released, the piece-like elastic valve body closes the shavings discharge port by an elastic restoring force.

  In order to solve the above-described problem, another dustproof unit according to the present invention has a shavings discharge port on a side face away from a nut. The shavings outlet communicates with the helical passage through at least one pore. When the fluid reaches the dustproof unit along the spiral path, the pores are enlarged by the pressure of the fluid, so that the shavings flow out of the shavings discharge port through the pores together with the fluid. When the pressure of the fluid is released, the pore diameter is restored to the original size.

  The detailed structure, features, assembling or using method of the dustproof unit of the ball screw according to the present invention will be clarified through the following detailed description of the embodiments. Further, the following detailed description and the embodiments presented by the present invention are only examples for explaining the present invention, and it is not common to limit the scope of the present invention. If so, it should be understood.

1 is a perspective view showing a dustproof unit according to a first embodiment of the present invention. 1 is a perspective view showing a ball screw to which a dustproof unit according to a first embodiment of the present invention is attached. FIG. 2 is a cross-sectional view showing a state in which a shavings discharge port is closed in a ball screw to which a dustproof unit according to the first embodiment of the present invention is attached. FIG. 2 is a cross-sectional view showing a state in which a shavings discharge port is opened in a ball screw to which a dustproof unit according to the first embodiment of the present invention is attached. It is a perspective view which shows the dustproof unit by 2nd Embodiment of this invention. It is a perspective view which shows the ball screw with which the dustproof unit by 2nd Embodiment of this invention is mounted | worn. It is sectional drawing which shows the state by which the shavings discharge port was closed in the ball screw with which the dustproof unit by 2nd Embodiment of this invention is mounted | worn. It is sectional drawing which shows the state by which the shavings discharge port was open | released in the ball screw with which the dustproof unit by 2nd Embodiment of this invention is mounted | worn. It is a perspective view which shows the dustproof unit by 3rd Embodiment of this invention. It is a front view which shows the dustproof unit by 3rd Embodiment of this invention. It is sectional drawing which shows the ball screw with which the dustproof unit by 3rd Embodiment of this invention is mounted | worn. It is a perspective view which shows the dustproof unit by 4th Embodiment of this invention. It is a front view which shows the dustproof unit by 4th Embodiment of this invention. It is sectional drawing which shows the ball screw with which the dustproof unit by 4th Embodiment of this invention is mounted | worn.

(First embodiment)
As shown in FIGS. 2 and 3, the ball screw 10 includes a screw 12, a nut 14 that covers the screw 12, and a plurality of balls (not shown in the drawing) disposed between the screw 12 and the nut 14. . The screw 12 has a thread groove 122 on the outer peripheral surface. The nut 14 has a thread groove 142 on the inner peripheral surface. The screw groove 122 of the screw 12 and the screw groove 142 of the nut 14 correspond to each other and constitute the spiral passage 16. The ball rolls along the spiral passage 16 and circulates. As shown in FIG. 1, the dustproof unit 18 according to the first embodiment of the present invention includes an annular main body 20 and three piece-like elastic valve bodies 30.

  The annular main body 20 has two opposing convex positioning parts 21, two opposing lip parts 22, and three shavings discharge ports 23. The convex positioning portion 21 is disposed on the outer annular surface of the annular body 20. The lip portion 22 is disposed on the inner annular surface of the annular body 20. The chip discharge ports 23 are arranged on the outer annular surface of the annular body 20 so as to be spaced apart from each other, and communicate with the spiral passage 16 toward one end of the nut 14. When the assembly operation is performed, the screw 12 is inserted into the annular main body 20, and the convex positioning portion 21 and the concave positioning groove 144 on the inner peripheral surface of the nut 14 are engaged with each other. After the assembly operation is completed, the lip portion 22 of the annular main body 20 abuts on the outer peripheral surface of the screw 12, so that foreign matter is prevented from entering the nut 14 and a sealing effect is produced.

  The piece-like elastic valve body 30 is arranged at one end where the shavings discharge port 23 of the annular main body 20 is back from the nut 14. In this embodiment, the nut 14 has a valve body groove 146 adjacent to the three concave positioning grooves 144 on the inner peripheral surface. The piece-like elastic valve body 30 is disposed in the valve body groove 146 of the nut 14, and one end is connected to the outer annular surface of the annular body 20 to close the shavings discharge port.

  When fluid (for example, fats and oils) is injected into the nut 14 to flow the shavings along the spiral passage 16 to the shaving discharge port 23, the fluid generates a force for pushing out the piece-like elastic valve body 30. As shown in FIG. 4, the piece-like elastic valve element 30 receives the fluid pressure and opens the shavings discharge port 23. At this time, the shavings flow out from the shavings discharge outlet 23 together with the fluid. When the injection of the fluid is stopped, the force that pushes the piece-like elastic valve body 30 by the fluid is released, so that the piece-like elastic valve body 30 closes the chip discharge port 23 by the elastic restoring force as shown in FIG. To do.

(Second Embodiment)
As shown in FIG. 5, in the dustproof unit 40 according to the second embodiment of the present invention, one end of the piece-like elastic valve body 44 is connected to the inner annular surface of the annular body 42 and the other end is in the direction opposite to the lip portion 46. And contacts the end face of the nut 14. As shown in FIGS. 7 and 8, when the piece-like elastic valve body 44 receives the pressure of the fluid and opens the shavings discharge port 48, the shavings flow out from the shavings discharge port 48 together with the fluid. When the pressure of the fluid is released, the piece-like elastic valve body 44 closes the shavings discharge port 48 by an elastic restoring force.

(Third embodiment)
In the above-described embodiment, the dustproof unit has a piece-like elastic valve body, but is not limited thereto. As shown in FIGS. 9 and 10, the dust-proof unit 50 according to the third embodiment of the present invention is made of an elastic material (for example, rubber), and has three swarf discharge ports distributed at equal angles on the side facing away from the nut 14. 52. Each chip discharge port 52 has a circular pore 54 communicating with the four spiral passages 16. As shown in FIG. 11, when the fluid reaches the dustproof unit 50 along the spiral passage 16, all the circular pores 54 are enlarged by the pressure of the fluid, so that the shavings are enlarged along with the fluid. It flows out from the shavings discharge port 52 through the hole 54. When the pressure of the fluid is released, the dustproof unit 50 is made of an elastic material, so that the hole diameters of all the circular pores 54 are restored to their original sizes. In the present embodiment, the pore 54 of the dustproof unit 50 is composed of a plurality of circular holes, but is not limited thereto.

(Fourth embodiment)
As shown in FIGS. 12 to 14, in the dustproof unit 60 according to the fourth embodiment of the present invention, the pores 64 have a cross shape. When the dustproof unit 60 receives the pressure of the fluid, the cross-shaped pore 64 is enlarged, so that the shavings flow out from the shaving discharge port 62 together with the fluid. When the pressure of the fluid is released, the pore diameter of the cross-shaped pore 64 is restored to the original size.

  As described above, the dustproof unit according to the present invention not only has a simple structure and a good sealing effect, but also effectively removes internal shavings and extends the service life of the ball screw. Can do.

10: Ball screw,
12: Screw,
122: thread groove,
14: nut,
142: thread groove,
144: concave positioning groove,
146: valve body groove,
16: Spiral passage,
18: Dust-proof unit,
20: annular body,
21: convex positioning part,
22: Lip part,
23: shavings outlet,
30: A piece-like elastic valve body,
40: dustproof unit,
42: annular body,
44: A piece-like elastic valve body,
46: Lip part,
48: Shavings discharge port,
50: dustproof unit,
52: Shavings discharge port,
54: pores,
60: dustproof unit,
62: Shavings discharge port,
64: Pore

Claims (4)

A ball screw including a screw and a nut covering the screw, and includes an annular main body and at least one piece-like elastic valve body;
The screw has a screw groove on the outer peripheral surface, the nut has a screw groove on the inner peripheral surface, and the screw groove of the screw and the screw groove of the nut correspond to each other to form a spiral path. ,
The annular body is disposed at one end of the nut, the screw passes through the annular body, the annular body has a lip portion formed on the inner annular surface, and at least one shavings formed on the outer annular surface. A discharge port, the lip portion abuts on the outer peripheral surface of the screw, the shaving discharge port communicates with the spiral passage,
The piece-like elastic valve body is connected to the annular main body and disposed at the shaving discharge port of the annular main body, one end is connected to the inner annular surface of the annular main body, and the other end is connected to the lip portion. A dustproof unit used for a ball screw, which extends in the opposite direction, abuts against an end face of the nut, and opens and closes the shavings discharge port according to the pressure in the spiral passage . A ball screw including a screw and a nut covering the screw, and includes an annular main body and at least one piece-like elastic valve body;
The screw has a screw groove on the outer peripheral surface, the nut has a screw groove on the inner peripheral surface, and the screw groove of the screw and the screw groove of the nut correspond to each other to form a spiral path. ,
The annular body is disposed at one end of the nut, the screw passes through the annular body, the annular body has a lip portion formed on the inner annular surface, and at least one shavings formed on the outer annular surface. A discharge port, the lip portion abuts on the outer peripheral surface of the screw, the shaving discharge port communicates with the spiral passage,
The nut has a valve body groove on the inner peripheral surface,
The piece-like elastic valve body is disposed in the valve body groove of the nut, one end is connected to the outer annular surface of the annular body, and the shaving discharge port is opened and closed according to the pressure in the spiral passage dust-proof unit for use in a ball screw it said to Rukoto. A dust-proof unit used for a ball screw including a screw and a nut covering the screw,
The screw has a screw groove on the outer peripheral surface, the nut has a screw groove on the inner peripheral surface, and the screw groove of the screw and the screw groove of the nut correspond to each other to form a spiral path. ,
The dustproof unit is disposed at one end of the nut, and the screw penetrates the dustproof unit,
The dust-proof unit has a lip portion formed on the inner annular surface, and a shavings discharge port formed on a side surface back from the nut,
The lip portion contacts the outer peripheral surface of the screw,
The scraper outlet communicates with the helical passage through at least one pore ;
A dustproof unit for use in a ball screw, wherein the pore diameter of the pores increases in accordance with the pressure in the spiral passage . The dustproof unit used for a ball screw according to claim 3 , wherein a cross section of the pore is a cross shape.

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