KR102395553B1 - Circulation member for ball screw - Google Patents

Abstract

Provided is a circulation member for a ball screw that can safely protect a ball screw and equipment around it. It has a screw shaft, a nut 92 screwed to the screw shaft, a plurality of rolling means between the screw shaft and the nut, a sending end and an entry end, and guiding the rolling means so that it can rotate In the circulation member for a ball screw used for a ball screw having a movement path, the member body (2) communicating with the sending end and the entering end, and guiding the rolling means so as to be rotationally movable, the sending end and A guide groove 3 having a curved end 31 that is curved while communicating, and an exit end 32 that communicates with the entry end and the curved end 31, and an installation formed on the outside of the guide groove 3 The tank 4 and the detection module 5 installed in the installation tank 4, sense the deformation|transformation of the member main body 2, and emit a warning signal are provided.

Description

CIRCULATION MEMBER FOR BALL SCREW

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

Patent Document 1 discloses a screw shaft, a nut screwed to the screw shaft, two circulation members provided at both ends of the nut, and rotatable between the screw shaft and the nut and the two circulation members A ball screw having a plurality of rolling means arranged in such a manner is disclosed.

Taiwan Registered Utility Model Publication No. M580639

However, when the ball screw is used for a long period of time, wear occurs on the inside, which interferes with the rotation and movement of the rolling means, so that while the rolling means passes through the circulation member, the rolling means press against each other due to rotational impurity, and the circulation The member may be pressed, the plastic circulation member may rupture, and the rolling means may fall off. Thereby, the ball screw cannot operate normally, and it is necessary to stop the machine and repair it. In addition, the dropped rolling means may collide with the ball screw or the facilities in its vicinity, and these facilities may be damaged.

A ball screw for preventing the rolling means from falling off by attaching a metal cover to the outside of the circulation member has been developed. However, such a ball screw has a drawback in that the stroke is short and maintenance is inconvenient because there are many steps for replacing the circulation member.

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

In order to achieve the above object, the present invention is a screw shaft,

a nut screwed to the screw shaft to surround the screw shaft from around;

a plurality of rolling means rotatably disposed between the screw shaft and the nut;

It is constituted by the screw shaft and the nut, and has a movement path guided so that the rolling means can move while rotating,

In the moving path, a sending end sent out from the moving path so that the rolling means circulates;

In the circulation member for a ball screw that the rolling means sent out from the sending end is used for a ball screw having an entry end entering the movement path to circulate the rolling means,

a member body installed on the nut to communicate with the sending end and the entering end;

A guide groove formed in the member body and guiding to move while rotating the rolling means, the curved end being curved while communicating with the sending end, and a guide groove having a lead-out end communicating with the entering end and the curved end;

In the member main body, with respect to the guide groove, an installation trough formed on the outer side opposite to the derivation end side;

Provided is a circulation member for a ball screw, which is installed in the installation tank, and includes a detection module that detects deformation of the member body due to pressure from the rolling means and emits a caution signal.

The circulation member for a ball screw of the present invention senses the deformation of the member body due to pressure from the rolling means by a detection module installed in the installation tank, and issues a caution signal, so that the member body is warned before rupture, so that the circulation Damage caused by rupture of the member and rupture of the circulation member can also be effectively prevented, so that the effect of safety protection can be achieved.

1 is a perspective perspective view showing a first embodiment of a circulation member for a ball screw of the present invention and a ball screw using the same.
Fig. 2 is an exploded view of parts showing the first embodiment of the circulation member for a ball screw and a ball screw using the same.
Fig. 3 is a partial perspective view showing the first embodiment of the circulation member for a ball screw and a screw shaft and a plurality of rolling means of the ball screw using the same.
It is a top view which shows 1st Embodiment of the said circulation member for ball screws.
It is a top view which shows 2nd Embodiment of the circulation member for ball screws of this invention.
Fig. 6 is a perspective perspective view showing a third embodiment of the circulation member for a ball screw of the present invention and a nut to which it is installed.
Fig. 7 is an exploded view of parts showing a third embodiment of the circulation member for a ball screw and a nut to which it is installed.
It is a perspective top view which shows 3rd Embodiment of the said circulation member for ball screws.
Fig. 9 is a perspective perspective view showing a fourth embodiment of the circulation member for a ball screw of the present invention and a nut to which it is installed.
Fig. 10 is a partially exploded view showing the fourth embodiment of the circulation member for a ball screw and a nut to which it is installed.
It is a perspective side view which shows 4th Embodiment of the said circulation member for ball screws.

EMBODIMENT OF THE INVENTION Hereinafter, each embodiment of this invention is described in detail, referring each drawing.

Before describing the present invention in more detail, it should be noted that, where deemed appropriate, the same reference numerals are used repeatedly between the drawings to indicate corresponding elements that may have the same characteristics. In addition, the data in an accompanying drawing is for explaining an outline|summary, and may not correspond to the real scale.

1 is a perspective perspective view showing a first embodiment of a circulation member for a ball screw of the present invention and a ball screw using the same. Fig. 2 is an exploded view of parts showing the circulation member for the ball screw and the ball screw using the same. 3 is a partial perspective view showing the above circulation member for a ball screw, a screw shaft of a ball screw using the same, and a plurality of rolling means. It is a top view which shows the said circulation member for ball screws.

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

The ball screw 9 includes a screw shaft 91 extending along the central axis L, and a nut 92 screwed to the screw shaft 91 so as to surround the screw shaft 91 from the periphery; It is constituted by a plurality of rolling means 93 rotatably arranged between the screw shaft 91 and the nut 92 , and the screw shaft 91 and the nut 92 , and the rolling means 93 rotates. It is provided with a movement path 94 that is guided so that it can be moved.

In addition, in the moving path 94, as shown in FIGS. 1 and 2 , a sending end 941 sent out from the moving path 94 in order for the rolling means 93 to circulately move, and a sending end 941 . The rolling means 93 sent from the has an entry end 942 that enters the movement path 94 .

In this embodiment, although the some rolling means 93 is a some ball, it is not limited to this, A device which can exhibit the same function, such as a cylinder, can also be used.

As shown in FIG. 2, the nut 92 can be equipped with an end face 921 substantially perpendicular to the central axis L, and a circulation member for a ball screw (specifically, the member body 2), , it has a mounting tank 922 in communication with the sending end 941 and the entering end 942.

In the present embodiment, the sending end 941 is a spiral groove defined between the screw shaft 91 and the nut 92 as shown in FIG. 1 , and the entering end 942 is the nut 92 . ) is a circulation path that is extended to be substantially parallel to the central axis (L) in the interior, and both ends are in communication with the spiral groove at the same time. In addition, depending on the moving direction of the rolling means 93, the circulation path becomes the sending end 941, and the spiral groove becomes the entering end 942 in some cases.

In addition, the ball screw may form a plurality of travel paths 94 depending on the tide, but for convenience of explanation, in this specification, one travel path 94 and one ball screw corresponding thereto It demonstrates using a circulation member.

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

The member body 2 is provided on the nut 92 so that the sending end 941 and the entry end 942 communicate with each other, as shown in FIGS. 1 to 4 . In this embodiment, the member main body 2 is an end plug, and since this end plug is a well-known technique, detailed description is abbreviate|omitted.

As shown in FIG. 4 , the guide groove 3 is formed in the member body 2 to guide the rolling means 93 while rotating, and the curved end 31 and the lead-out end 32 . and an introduction end (33).

The introduction end 33 communicates with the transmission end 941 .

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

The exit end 32 communicates with the entry end 942 and the curved end 31 .

Further, in the member body 2, the curved end 31 has an inner edge 311 on the inner side that is on the lead-out end 32 side with respect to the guide groove 3, and an outer edge portion on the opposite side to the inner side ( 312), and the outer edge part 312 is curved so that it may become a circular arc which makes the reference point A as a centrifugal (圓心).

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

In addition, as shown in Fig. 4, the reference point (A) is centrifugal, and the radius (R2) is longer than the radius (R1) of the outer edge (312) of the curved end (31) the inner reference arc (S1) and , the radius R3 sets the outer reference arc S2 longer than the radius R2 of the inner reference arc S1. The installation tank 4 is formed between the inner reference arc S1 and the outer reference arc S2.

The first difference that is the difference between the radius R2 of the inner reference arc S1 and the radius R1 of the outer edge 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 open along the longitudinal direction X substantially parallel to the plane substantially perpendicular to the central axis L, and the longitudinal direction X and approximately The length in the width direction Y of the orthogonal opening is 1 mm or more.

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

As shown in Figs. 3 and 4, the detection module 5 is provided in the installation tank 4, detects the deformation of the member body 2 due to pressure from the rolling means 93, and sends a warning signal. As what emits, it is provided on the side near the curved end 31 of the installation tank 4, or the side far from the curved end 31, and is equipped with the force sensor 51 whose thickness is 0.1 mm or more.

In this embodiment, the detection module 5 is provided on the side close to the curved end 31 of the installation tank 4, as shown in Fig. 4, and a force sensor having a thickness of 0.1 mm ( 51), a force detection resistor (FSR, Force Sensing resistor) is provided.

Also, in use, 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 warning signal to the control system.

When using the ball screw, the plurality of rolling means 93 enters the member body 2 from the sending end 941 which is a spiral groove, and the introduction end 33, the curved end 31, and the outgoing end 32 are sequentially arranged. By passing through the main road and moving to the entry end 942 which is a circulation path, it circulates in the movement path 94 by entering.

When the circulation movement is disturbed due to wear, the curved end 31 of the member body 2 is easily pressed by the rolling means 93 , and the installation tank 4 is deformed. At that time, the side close to the curved end 31 of the installation jaw 4 approaches the side farther from the curved end 31 , and the installation jaw 4 is a force sensor provided on the side close to the curved end 31 . When the 51 deforms until it contacts the side farther from the curved end 31, the force sensor 51 issues a caution signal to the control system, and the control system receiving the caution signal stops the operation of the ball screw and , to warn the operator of maintenance or replacement of parts. Thereby, the damage of the member main body 2 and the damage of the ball screw by the said breakage, or the equipment in its periphery can be prevented, and the effect by safety protection can be achieved.

Since the member body 2 is a general injection-molded plastic product, the first difference is 1 mm or more, and the second difference is 1 mm or more in order to have a strength to the extent that it does not break before issuing a caution signal. It is preferable to write a catalog.

It is a top view which shows 2nd Embodiment of the circulation member for ball screws of this invention.

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

In the present embodiment, as shown in FIG. 5 , the opening of the installation tank 4 is opened along the longitudinal direction X substantially parallel to the tangent line of the outer edge 312 of the curved end 31 . , the length in the width direction Y of the opening substantially orthogonal to the longitudinal direction X is 1 mm. The first difference is 1 mm, and the second difference is 2 mm, which is at least half the average diameter of the plurality of balls. The detection module 5 is provided on the side far from the curved end 31 of the installation tank 4, and is provided with a force sensor 51 having a thickness of 0.1 mm.

When the installation jaw 4 deforms until the side close to the curved end 31 comes into contact with the force sensor 51 provided on the side farther from the curved end 31, the force sensor 51 is sent to the control system. By issuing an attention signal, the same effect as that of the first embodiment can be achieved.

Fig. 6 is a perspective perspective view showing a third embodiment of the circulation member for a ball screw of the present invention and a nut to which it is installed. Fig. 7 is an exploded view of parts showing the circulation member for the ball screw and a nut to which it is installed. It is a perspective top view which shows the said circulation member for ball screws.

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

The circulation member for a ball screw of this embodiment is used for the ball screw which has the end surface 921 penetrated by the sending end 941 and the entry end 942, as shown in FIG.

The member body 2 has, as shown in FIGS. 6 to 8 , an annular body 21 provided on an end face 921 , and an extension portion 22 inserted into an entry end 942 .

The guide groove 3 is formed in the annular body 21 and the extending part 22, as shown in FIG.

The curved end 31 is formed at the junction of the annular body 21 and the extending|stretching part 22, as shown in FIG.

As shown in FIG. 8, the opening of the installation tank 4 is formed in the circular arc shape with the reference point A being centrifuged. The side close to the curved end 31 of the installation tank 4 is formed along the inside reference|standard arc S1. The side farther from the curved end 31 of the installation tank 4 is formed along the outer side reference arc S2. That is, the width of the opening of the installation tank 4 is equal to the second difference.

As shown in FIG. 8 , the detection modules 5 are respectively provided on the side closer to the curved end 31 and the side far from the curved end 31 of the installation tank 4 , and have a thickness of 0.1 Two metal plates 52 of mm or larger are provided. In the present embodiment, the first difference is 1 mm, and the second difference is 1 mm or more of half the average diameter of the plurality of balls (that is, the width of the opening of the installation tank is also 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 a power source (not shown).

When the installation tank 4 deforms until the metal plate 52 provided on the side close to the curved end 31 comes into contact with the metal plate 52 provided on the side farther from the curved end 31, two The metal plate 52 is short-circuited to issue a warning signal to the control system (the current from the power supply becomes a warning signal due to the short circuit), thereby achieving the same effect as in the first embodiment.

Fig. 9 is a perspective perspective view showing a fourth embodiment of the circulation member for a ball screw of the present invention and a nut to which it is installed. Fig. 10 is an exploded view of partial parts showing the circulation member for the ball screw and a nut to which it is installed. It is a perspective side view which shows the said circulation member for ball screws.

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

As shown in FIGS. 9 and 10, the circulation member for a ball screw of this embodiment surrounds the central axis L, and the nut 92 is attached to the sending end 941 and the entering end 942. It is of an external circulation specification used for a ball screw having a penetrating outer circumferential surface 923, and in which the outgoing end 941 and the entering end 942 are part of the spiral groove.

As shown in FIGS. 10 and 11, the member body 2 is formed at opposite ends of the central portion 23 provided outside the outer peripheral surface 923 and the central portion 23, and the sending end 941 and It has two junctions 24 inserted into each of the entry ends 942 .

The guide groove 3 is formed in the central portion 23 and the two connecting portions 24 , and the sending end 941 and the entry end 942 are at both ends of the guide groove 3 , respectively.

The curved end 31 is formed in any one of the junctions of the center part 23 and each of the two junctions 24, and in this embodiment, it is formed in both of the two junctions.

As shown in Fig. 11, the opening of the installation tank 4 is formed in a circular arc shape with the reference point A being centrifugal. The side close to the curved end 31 of the installation tank 4 is formed along the inside reference|standard arc S1. The side farther from the curved end 31 of the installation tank 4 is formed along the outer side reference arc S2. That is, the width of the opening of the installation tank 4 is equal to the second difference.

As shown in FIG. 11 , the sensing modules 5 are respectively provided on the side closer to the curved end 31 and the side far from the curved end 31 of the installation tank 4 , and have a thickness of 0.1 Two metal plates 52 of mm or larger are provided. In the present embodiment, the first difference is 1 mm, and the second difference is 2.3 mm (that is, the width of the opening of the installation tank is 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 a power source (not shown). In addition, in this embodiment, although the two metal plates 52 are provided in each of the two installation tanks 4, even if it provides the two metal plates 52 in the one installation tank 4, of this invention have an effect

When the installation tank 4 deforms until the metal plate 52 provided on the side close to the curved end 31 comes into contact with the metal plate 52 provided on the side farther from the curved end 31, two The metal plate 52 is short-circuited to issue a warning signal to the control system (the current from the power supply becomes a warning signal due to the short circuit), thereby achieving the same effect as in the first embodiment.

In the foregoing, for purposes of explanation, numerous specific details have been set forth in order to prompt a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that one or more other embodiments may be practiced without specific details.

As mentioned above, although preferred embodiment and change example of this invention were described, this invention is not limited to these, It is various structures included within the spirit and scope of the widest interpretation, It is to include all modifications and equivalent structures. do.

The circulation member for a ball screw of the present invention can be applied to a ball screw to prevent damage to the ball screw or equipment in the vicinity thereof.

2: member body 21: annular body
22: stretching part 23: central part
24: connection part 3: guide groove
31: curved end 311: inner edge
312: outer edge 32: leading end
33: introduction stage 4: installation group
5: detection module 51: force sensor
52: metal plate 9: ball screw
91: screw shaft 92: nut
921: cross section 922: mounting jaw
923: outer peripheral surface 93: rolling means
94: Idong-ro 941: transmission group
942: entry end A: reference point
L: central axis R1, R2, R3: radius
S1 : Inner reference arc S2 : Outer reference arc
X : Length direction Y : Width direction

Claims (9)

screw shaft,
a nut screwed to the screw shaft to surround the screw shaft from around;
a plurality of rolling means rotatably disposed between the screw shaft and the nut;
It is constituted by the screw shaft and the nut, and has a movement path that is guided so that the rolling means can move while rotating,
In the moving path, a sending end sent out from the moving path in order for the rolling means to circulate;
In the circulation member for a ball screw that the rolling means sent out from the sending end is used for a ball screw having an entry end entering the movement path to circulate the rolling means,
a member body installed on the nut to communicate with the sending end and the entering end;
A guide groove formed in the member body and guiding to move while rotating the rolling means, the curved end being curved while communicating with the sending end, and a guide groove having a lead-out end communicating with the entering end and the curved end;
In the member main body, with respect to the guide groove, an installation trough formed on the outer side opposite to the derivation end side;
It is installed in the installation tank so as to be spaced apart from at least one of a side wall close to the curved end and a side wall far from the curved end of the installation tank, and by pressing from the rolling means, opposite sides are on the two side walls and a sensing module that detects that the member body is deformed so that the gap is compressed until it receives pressure by
The outer edge of the curved end is formed to be a circular arc with a reference point as centrifugal,
The opening of the installation tank is open along a longitudinal direction parallel to the tangent of the outer edge of the curved end, and the length in the width direction of the opening orthogonal to the longitudinal direction is 1 mm or more, characterized in that
Circulation member for ball screws. The method of claim 1,
Using the reference point as a centrifugal point, if an inner reference arc having a radius longer than the radius of the outer edge of the curved end 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, is 1 mm or more,
A second difference, which is a difference between the radius of the outer reference arc and the radius of the inner reference arc, is 1 mm or more
Circulation member for ball screws. 3. The method of claim 2,
the screw shaft extends along a central axis;
The nut has an end face orthogonal to the central axis, and a mounting jaw to which the member body is mounted and communicated with the sending end and the entering end;
A circulation member for a ball screw used in a ball screw, wherein the plurality of rolling means are a plurality of balls,
wherein the second difference is equal to or greater than half the average diameter of the plurality of balls.
Circulation member for ball screws. delete delete 4. The method of claim 2 or 3,
The sensing module is provided on a side near the curved end of the installation tank or on a side far from the curved end, and a force sensor having a thickness of 0.1 mm or more is provided.
Circulation member for ball screws. 3. The method of claim 2,
the screw shaft extends along a central axis;
A circulation member for a ball screw used in a ball screw, wherein the nut is orthogonal to the central axis and has end faces penetrated at the outgoing end and the entering end,
The member body has an annular body installed on the end surface, and an extension part inserted into the entry end,
The guide groove is formed in the annular body and the stretching portion,
The curved end is characterized in that the annular body is formed at a connecting portion of the stretching portion.
Circulation member for ball screws. 3. The method of claim 2,
the screw shaft extends along a central axis;
A circulation member for a ball screw used in a ball screw, wherein the nut has an outer circumferential surface penetrating through the sending end and the entering end,
The member body has a central portion provided on the outside of the outer circumferential surface, and two connecting portions formed at opposite ends of the central portion and inserted into each of the sending end and the entry end,
The guide groove is formed in the central portion and the two connecting portions,
The curved end is formed in any one of the junction of each of the central portion and the two junctions.
Circulation member for ball screws. 9. The method of any one of claims 2, 7 and 8,
The sensing module is provided with two metal plates each having a side closer to the curved end and a side far from the curved end of the installation tank, and having a thickness of 0.1 mm or more.
Circulation member for ball screws.

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