JP6986593B2 - Circulation member for ball screw - Google Patents

Description

The present invention relates to a ball screw, and particularly to a circulation member for a ball screw.

Patent Document 1 describes a screw shaft, a nut screwed on the screw shaft, two circulation members installed at both ends of the nut, the screw shaft, the nut, and the two circulation members. A ball screw comprising a plurality of rolling means, which are rotatably arranged between the two, is described.

Taiwan Registered Utility Model No. M580639

However, if the ball screw is used for a long period of time, internal wear occurs, which hinders the rotation and movement of the rolling means. Therefore, while the rolling means passes through the circulation member, the rolling means are pressed against each other due to the irregular rotation and circulate. The member may be pressed and the plastic circulation member may burst, causing the rolling means to fall off. As a result, the ball screw cannot operate normally, and the machine needs to be stopped and repaired. Further, the falling rolling means may collide with the ball screw or the equipment around it and break these equipments.

A ball screw has been developed that prevents the rolling means from falling off by attaching a metal lid to the outside of the circulation member. However, such a ball screw has a short stroke and requires many steps to replace the circulation member, which makes maintenance inconvenient. There is a drawback.

In view of the above problems, it is an object of the present invention to provide a circulation member for a ball screw that can safely protect the ball screw and the equipment around the ball screw in order to overcome the above-mentioned drawbacks.

In order to achieve the above object, the present invention has a screw shaft and
A nut screwed on the screw shaft so as to wrap the screw shaft from the surroundings,
A plurality of rolling means rotatably arranged between the screw shaft and the nut,
It comprises a moving path, which is composed of the screw shaft and the nut and is guided so that the rolling means can move while rotating.
In the moving path, a delivery stage sent out from the moving path for the rolling means to circulate and move,
A ball screw circulation member used for a ball screw having an approach stage in which the rolling means sent out from the delivery stage enters the movement path to circulate the rolling means.
A member body installed in the nut so as to communicate with the sending stage and the approaching stage.
A curved step that is formed in the member body and guides the rolling means so that it can move while rotating, and is curved while communicating with the sending step, and the approach step and the curved step. A guide groove having a lead-out stage that communicates with
In the member main body, an installation tank formed on the outer side opposite to the lead-out stage side with respect to the guide groove, and
Wherein optionally be installed in the installing vessel so that at least 1's and spacing far side walls from said side wall and said curved stepped close to the curvature stage of the installation vessel becomes empty, Ri by the pressure from the rolling means, on both sides against There senses the member body that is deformed so that the distance until the pressure by the two side walls are compressed, circulating ball screw, characterized in that it comprises a and a sensing module for emitting attention signal Provides a member.

In the ball screw circulation member of the present invention, the sensing module installed in the installation tank senses the deformation of the member body due to the pressing from the rolling means and issues a caution signal to warn the member body before it bursts. Therefore, the rupture of the circulation member and the damage caused by the rupture of the circulation member can be effectively prevented, and the effect of safety protection can be achieved.

It is a perspective perspective view which shows the 1st Embodiment of the circulation member for a ball screw of this invention, and the ball screw which uses it. It is a component exploded view which shows the 1st Embodiment of the said circulation member for a ball screw and the ball screw which uses it. It is a partial perspective view which shows the 1st Embodiment of the said circulation member for a ball screw, the screw shaft of a ball screw which uses it, and a plurality of rolling means. It is an upper view which shows the 1st Embodiment of the said circulation member for a ball screw. It is an upper view which shows the 2nd Embodiment of the circulation member for a ball screw of this invention. It is a perspective perspective view which shows the 3rd Embodiment of the circulation member for a ball screw of this invention, and the nut in which it is installed. It is a component exploded view which shows the 3rd Embodiment of the said circulation member for a ball screw, and the nut in which it is installed. It is a perspective view which shows the 3rd Embodiment of the said circulation member for a ball screw. It is a perspective perspective view which shows the 4th Embodiment of the circulation member for a ball screw of this invention, and the nut in which it is installed. It is a partial component exploded view which shows the 4th Embodiment of the said circulation member for a ball screw and the nut in which it is installed. It is a perspective view which shows the 4th Embodiment of the said circulation member for a ball screw.

Hereinafter, each embodiment of the present invention will be described in detail with reference to each drawing.

Before describing the invention in more detail, it should be noted that the same reference numerals are used repeatedly between drawings to indicate corresponding elements that may have similar properties, where appropriate. In addition, the data in the attached drawings is for explaining the outline and may not correspond to the actual scale.

FIG. 1 is a perspective perspective view showing a first embodiment of the ball screw circulation member of the present invention and a ball screw using the same. FIG. 2 is an exploded view of parts showing the above-mentioned ball screw circulation member and the ball screw using the same. FIG. 3 is a partial perspective view showing the above-mentioned ball screw circulation member, the screw shaft of the ball screw using the same, and a plurality of rolling means. FIG. 4 is an upper view showing the above-mentioned ball screw circulation member.

As shown in FIGS. 1 and 2, the ball screw circulation member of the present invention is used for the ball screw 9 to circulate the rolling means 93 in the ball screw 9.

The ball screw 9 includes a screw shaft 91 extending along the central axis L, a nut 92 screwed onto the screw shaft 91 so as to wrap the screw shaft 91 from the surroundings, and the screw shaft 91 and the nut 92. A plurality of rolling means 93 rotatably arranged between them, and a moving path 94 which is composed of a screw shaft 91 and a nut 92 and is guided so that the rolling means 93 can move while rotating. It is equipped with.

Further, in the moving path 94, as shown in FIGS. 1 and 2, a sending stage 941 sent out from the moving path 94 for the rolling means 93 to circulate and move, and a rolling means 93 sent out from the sending step 941. Has an approach stage 942 that enters the movement path 94.

In this embodiment, the plurality of rolling means 93 is not limited to a plurality of balls, but a device capable of exhibiting the same function such as a cylinder can also be used.

As shown in FIG. 2, the nut 92 has an end face 921 substantially orthogonal to the central axis L, and a ball screw circulation member (specifically, the member body 2) can be attached to the nut 92 and the delivery stage 941 and the entry stage 942. It has a mounting tank 922 that communicates with it.

In this embodiment, the delivery step 941 is a spiral groove defined between the screw shaft 91 and the nut 92, and the entry step 942 is inside the nut 92, as shown in FIG. It is a circulation path that extends so as to be substantially parallel to the central axis L and has both ends communicating with the spiral groove at the same time. Further, depending on the moving direction of the rolling means 93, the circulation path may become the delivery stage 941 and the spiral groove may become the approach stage 942.

The ball screw can form a plurality of moving paths 94 according to the number of threads, but for convenience of explanation, in the present specification, one moving path 94 and one corresponding circulation member for the ball screw. Will be described using.

As shown in FIGS. 2 to 4, the ball screw circulation member of the present invention includes a member main body 2, a guide groove 3, an installation tank 4, and a sensing module 5.

As shown in FIGS. 1 to 4, the member main body 2 is installed in the nut 92 so as to communicate the sending stage 941 and the approach stage 942. In this embodiment, the member body 2 is an end plug (end).
Since the end plug is a known technique, detailed description thereof will be omitted.

As shown in FIG. 4, the guide groove 3 is formed in the member main body 2 and guides the rolling means 93 so as to be able to move while rotating, and is a curved step 31 and a lead-out step 32. And an introduction stage 33.

The introduction stage 33 communicates with the transmission stage 941.

The curved stage 31 communicates with the lead-out stage 32 and the introduction stage 33, and communicates with the transmission stage 941 via the introduction stage 33.

The lead-out stage 32 communicates the approach stage 942 and the curved stage 31.

Further, the curved step 31 has an inner edge portion 311 on the inner side of the guide groove 3 on the side of the lead-out step 32 and an outer edge portion 312 on the outer side opposite to the inner side of the member main body 2. Moreover, the outer edge portion 312 is bent so as to form an arc with the reference point A as the center of the circle.

As shown in FIG. 4, the installation tank 4 is formed on the outer side of the member main body 2 which is opposite to the guide groove 3 on the side of the lead-out stage 32.

Further, as shown in FIG. 4, the inner reference arc S1 having the reference point A as the center of the circle and the radius R2 longer than the radius R1 of the outer edge portion 312 of the curved step 31 and the radius R3 from the radius R2 of the inner reference arc S1. A long outer reference arc S2 is set. The installation tank 4 is formed between the inner reference arc S1 and the outer reference arc S2.

The first difference, which is the difference between the radius R2 of the inner reference arc S1 and the radius R1 of the outer edge portion 312, is 1 mm or more.

The second difference, which is the difference between the radius R3 of the outer reference arc S2 and the radius R2 of the inner reference arc S1, is 1 mm or more.

As shown in FIG. 4, the opening of the installation tank 4 is opened along the length direction X substantially parallel to the plane substantially orthogonal to the central axis L, and is abbreviated as the length direction X. The length in the width direction Y of the orthogonal openings is 1 mm or more.

In this embodiment, the first difference is at 1 mm and the second difference is at 2 mm, which is more than half the average diameter of the plurality of balls. The length of the opening of the installation tank 4 in the width direction Y is 1 mm.

As shown in FIGS. 3 and 4, the sensing module 5 is installed in the installation tank 4, senses deformation of the member main body 2 due to pressing from the rolling means 93, and emits a caution signal. The force detector 51 is installed on the side of the installation tank 4 near the curved step 31 or far from the curved step 31, and has a thickness of 0.1 mm or more.

In this embodiment, as shown in FIG. 4, the sensing module 5 is a force sensor 51 installed on the side close to the curved stage 31 of the installation tank 4 and having a thickness of 0.1 mm. It is equipped with a force detection resistor (FSR, Force sensoring resistor).

Further, when used, the force sensor 51 is electrically connected to a control system (not shown), and when a force is applied to the force sensor 51, the force sensor 51 issues a caution signal to the control system. ..

When using the ball screw, the plurality of rolling means 93 enter the member main body 2 from the delivery step 941 which is a spiral groove, pass through the introduction step 33, the bending step 31, and the lead-out step 32 in order, and pass through the circulation path. By moving to the approach stage 942 and entering, the ball circulates in the movement path 94.

When the circulation movement is hindered by wear, the curved step 31 of the member main body 2 is easily pressed by the rolling means 93, and the installation tank 4 is deformed. At that time, the side of the installation tank 4 near the curved stage 31 approaches the side far from the curved stage 31, and the force detector 51 installed in the installation tank 4 near the curved stage 31 is on the side far from the curved stage 31. When deformed until it comes into contact with, the force sensor 51 sends a caution signal to the control system, and the control system that receives the caution signal stops the operation of the ball screw, and the operator is required to perform maintenance, replace parts, etc. Issue a warning. As a result, it is possible to prevent the member main body 2 from being damaged and the ball screw or the equipment around the ball screw from being damaged due to the damage, and it is possible to achieve an effect on safety protection.

Since the member main body 2 is a general injection-molded plastic product, the first difference is 1 mm or more and the second difference is 1 mm in order to have a strength that does not crack before issuing a caution signal. It is preferable to create as described above.

FIG. 5 is an upper view showing a second embodiment of the ball screw circulation member of the present invention.

Since the second embodiment of the present invention has many configurations in common with the first embodiment, detailed description thereof will be omitted here, and the differences thereof will be described.

In this embodiment, as shown in FIG. 5, the opening of the installation tank 4 is opened along the length direction X substantially parallel to the tangent line of the outer edge portion 312 of the curved step 31, and has a length. The length in the width direction Y of the opening that is substantially orthogonal to the vertical direction X is 1 mm. The first difference is at 1 mm and the second difference is at 2 mm, which is more than half the average diameter of the plurality of balls. The sensing module 5 is installed on the side far from the curved step 31 of the installation tank 4, and includes a force detector 51 having a thickness of 0.1 mm.

When the installation tank 4 is deformed until the side close to the curved step 31 comes into contact with the force sensor 51 installed on the side far from the curved step 31, the force sensor 51 issues a caution signal to the control system and first. The same effect as that of the embodiment can be achieved.

FIG. 6 is a perspective perspective view showing a third embodiment of the ball screw circulation member of the present invention and a nut in which the ball screw circulation member is installed. FIG. 7 is an exploded view of parts showing the above-mentioned ball screw circulation member and the nut on which the ball screw circulation member is installed. FIG. 8 is a perspective view showing the ball screw circulation member.

Since the third embodiment of the present invention has many configurations in common with the first embodiment, detailed description thereof will be omitted here, and the differences thereof will be described.

As shown in FIG. 7, the ball screw circulation member of this embodiment is used for a ball screw having an end face 921 penetrated through a delivery stage 941 and an entry stage 942.

As shown in FIGS. 6 to 8, the member main body 2 has an annular body 21 installed on the end face 921 and an extension portion 22 inserted into the approach step 942.

As shown in FIG. 8, the guide groove 3 is formed in the annular body 21 and the stretched portion 22.

As shown in FIG. 8, the curved step 31 is formed at a joint portion between the annular body 21 and the extended portion 22.

As shown in FIG. 8, the opening of the installation tank 4 is formed in an arc shape with the reference point A as the center of the circle. The side of the installation tank 4 near the curved step 31 is formed along the inner reference arc S1. The side of the installation tank 4 far from the curved step 31 is formed along the outer reference arc S2. That is, the width of the opening of the installation tank 4 is the same as the second difference.

As shown in FIG. 8, the sensing modules 5 are installed on the side closer to the curved step 31 and the side far from the curved step 31 of the installation tank 4, respectively, and have a thickness of 0.1 mm or more. It includes two metal plates 52. In this embodiment, the first difference is at 1 mm and the second difference is at 1 mm, which is more than half the average diameter of the plurality of balls (ie, the width of the opening of the installation tank is also at 1 mm). ). The thickness of the metal plate 52 is 0.1 mm, and one of the two metal plates 52 is electrically connected to the control system and the other is electrically connected to the power supply (not shown).

When the installation tank 4 is deformed until the metal plate 52 installed on the side closer to the curved stage 31 comes into contact with the metal plate 52 installed on the side far from the curved stage 31, the two metal plates 52 are short-circuited. Therefore, a caution signal (a current from the power source becomes a caution signal due to a short circuit) can be emitted to the control system to achieve the same effect as in the first embodiment.

FIG. 9 is a perspective perspective view showing a fourth embodiment of the ball screw circulation member of the present invention and a nut in which the ball screw circulation member is installed. FIG. 10 is an exploded view of a partial part showing the above-mentioned ball screw circulation member and the nut on which the ball screw circulation member is installed. FIG. 11 is a perspective view showing the ball screw circulation member.

Since the fourth embodiment of the present invention has many configurations in common with the first embodiment, detailed description thereof will be omitted here, and the differences thereof will be described.

As shown in FIGS. 9 and 10, the ball screw circulation member of this embodiment surrounds the central axis L and has an outer peripheral surface 923 through which the nut 92 is penetrated by the delivery step 941 and the entry step 942. Moreover, the sending stage 941 and the approach stage 942 are of the external circulation specification used for the ball screw which is a part of the spiral groove.

As shown in FIGS. 10 and 11, the member main body 2 is formed at both ends opposite to the central portion 23 installed outside the outer peripheral surface 923 and the central portion 23, and is formed of the sending stage 941 and the approach stage 942. It has two connecting portions 24, which are inserted into each.

The guide groove 3 is formed in the central portion 23 and the two connecting portions 24, and each of the sending stage 941 and the approach stage 942 is located at both ends of the guide groove 3.

The curved step 31 is formed at one of the connecting portions between the central portion 23 and each of the two connecting portions 24, and in this embodiment, both the two connecting portions are formed.

As shown in FIG. 11, the opening of the installation tank 4 is formed in an arc shape with the reference point A as the center of the circle. The side of the installation tank 4 near the curved step 31 is formed along the inner reference arc S1. The side of the installation tank 4 far from the curved step 31 is formed along the outer reference arc S2. That is, the width of the opening of the installation tank 4 is the same as the second difference.

As shown in FIG. 11, the sensing modules 5 are installed on the side closer to the curved step 31 and the side far from the curved step 31 of the installation tank 4, respectively, and have a thickness of 0.1 mm or more. It includes two metal plates 52. In this embodiment, the first difference is at 1 mm and the second difference is at 2.3 mm (ie, the width of the opening of the installation tank is at 2.3 mm). The thickness of the metal plate 52 is 0.1 mm, and one of the two metal plates 52 is electrically connected to the control system and the other is electrically connected to the power supply (not shown). Further, in this embodiment, two metal plates 52 are installed in each of the two installation tanks 4, but even if two metal plates 52 are installed in the installation tank 4 on one side, the effect of the present invention can be obtained. Have.

When the installation tank 4 is deformed until the metal plate 52 installed on the side closer to the curved stage 31 comes into contact with the metal plate 52 installed on the side far from the curved stage 31, the two metal plates 52 are short-circuited. Therefore, a caution signal (a current from the power source becomes a caution signal due to a short circuit) can be emitted to the control system to achieve the same effect as in the first embodiment.

In the above, for illustration purposes, many specific details have been presented to facilitate an overall understanding of the invention. However, it will be apparent to those skilled in the art that one or more other embodiments may be implemented without specific details.

Although the preferred embodiments and variations of the present invention have been described above, the present invention is not limited thereto, and all modifications and equivalents are made as various configurations included in the spirit and scope of the broadest interpretation. It shall include the composition.

The circulation member for a ball screw of the present invention can be used for a ball screw to prevent damage to the ball screw or the equipment around the ball screw.

2 Member body 21 Circular body 22 Extension part 23 Central part 24 Connecting part 3 Guide groove 31 Curved stage 311 Inner edge part 312 Outer edge part 32 Derivation stage 33 Introduction stage 4 Installation stage 5 Sensing module 51 Force detector 52 Metal plate 9 Ball screw 91 Screw shaft 92 Nut 921 End surface 922 Mounting tank 923 Outer peripheral surface 93 Rolling means 94 Moving path 941 Sending stage 942 Entry stage A Reference point L Center axis R1, R2, R3 Radius S1 Inner reference arc S2 Outer reference arc X Length direction Y Width direction

Claims (9)

With a screw shaft,
A nut screwed on the screw shaft so as to wrap the screw shaft from the surroundings,
A plurality of rolling means rotatably arranged between the screw shaft and the nut,
It comprises a moving path, which is composed of the screw shaft and the nut and is guided so that the rolling means can move while rotating.
In the moving path, a delivery stage sent out from the moving path for the rolling means to circulate and move,
A ball screw circulation member used for a ball screw having an approach stage in which the rolling means sent out from the delivery stage enters the movement path to circulate the rolling means.
A member body installed in the nut so as to communicate with the sending stage and the approaching stage.
A curved step that is formed in the member body and guides the rolling means so that it can move while rotating, and is curved while communicating with the sending step, and the approach step and the curved step. A guide groove having a lead-out stage that communicates with
In the member main body, an installation tank formed on the outer side opposite to the lead-out stage side with respect to the guide groove, and
Wherein optionally be installed in the installing vessel so that at least 1's and spacing far side walls from said side wall and said curved stepped close to the curvature stage of the installation vessel becomes empty, Ri by the pressure from the rolling means, on both sides against There senses the member body that is deformed so that the distance until the pressure by the two side walls are compressed, circulating ball screw, characterized in that it comprises a and a sensing module for emitting attention signal Element. The outer edge portion of the curved step on the outer side is formed so as to form an arc with the reference point as the center of the circle.
With the reference point as the center of a circle, an inner reference arc having a radius longer than the radius of the outer edge of the curved step and an outer reference arc having a radius longer than the radius of the inner reference arc are set.
The installation tank is formed between the inner reference arc and the outer reference arc.
The first difference, which is the difference between the radius of the inner reference arc and the radius of the outer edge portion, is 1 mm or more.
The circulation member for a ball screw according to claim 1, wherein the second difference, which is the difference between the radius of the outer reference arc and the radius of the inner reference arc, is 1 mm or more. The screw shaft extends along the central axis and
The nut has an end face that is substantially orthogonal to the central axis, and a mounting tank to which the member body is attached and communicates with the sending stage and the approach stage.
A ball screw circulation member used for a ball screw, wherein the plurality of rolling means is a plurality of balls.
The circulation member for a ball screw according to claim 2, wherein the second difference is at least half the average diameter of the plurality of balls. The screw shaft extends along the central axis and
A ball screw circulation member used for a ball screw, wherein the nut has an end face substantially orthogonal to the central axis, and a mounting tank to which the member body is attached and communicates with the sending stage and the approach stage. There,
The opening of the installation tank is opened along a length direction substantially parallel to a plane substantially orthogonal to the central axis, and is a length in the width direction of the opening substantially orthogonal to the length direction. The ball screw circulation member according to claim 2, wherein the ball screw has a length of 1 mm or more. The screw shaft extends along the central axis and
The nut is a ball screw circulation member used for a ball screw having an end face substantially orthogonal to the central axis, a mounting tank to which the member main body can be mounted, and a mounting tank communicating with the sending stage and the approach stage. hand,
The opening of the installation tank is opened along a length direction substantially parallel to the tangent line of the outer edge portion of the curved step, and is in the width direction of the opening substantially orthogonal to the length direction. The circulation member for a ball screw according to claim 2, wherein the length is 1 mm or more. The sensing module is characterized in that it is installed on the side of the installation tank near the curved step or on the side far from the curved step, and is provided with a force detector having a thickness of 0.1 mm or more. The ball screw circulation member according to any one of claims 2 to 5. The screw shaft extends along the central axis and
A ball screw circulation member used for a ball screw in which the nut is substantially orthogonal to the central axis and has an end face penetrated by the sending stage and the approach stage.
The member main body has an annular body installed on the end face and an extension portion inserted into the approach stage.
The guide groove is formed in the annular body and the stretched portion.
The ball screw circulation member according to claim 2, wherein the curved step is formed at a joint portion between the annular body and the stretched portion. The screw shaft extends along the central axis and
The nut is a ball screw circulation member used for a ball screw having an outer peripheral surface penetrated by the sending stage and the approach stage.
The member main body includes a central portion installed outside the outer peripheral surface, two connecting portions formed at both ends opposite the central portion and inserted into each of the sending stage and the approach stage. Have,
The guide groove is formed in the central portion and the two connecting portions.
The circulation member for a ball screw according to claim 2, wherein the curved step is formed at one of the connecting portions between the central portion and each of the two connecting portions. Each of the sensing modules is installed on the side of the installation tank near the curved stage and on the side far from the curved stage, and includes two metal plates having a thickness of 0.1 mm or more. The ball screw circulation member according to any one of claims 2, 7, and 8.

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