JP5029207B2 - Nut and rolling screw device having the same - Google Patents

Description

  The present invention relates to a nut in which a lubricant supply body for supplying a lubricant to an outer peripheral surface of a screw shaft is disposed on an end side, and an improvement of a rolling screw device including the nut.

Conventionally, a linear screw device such as a ball screw or a roller screw is used in the form of a conveying device combined with a linear guide device such as a linear guide.
FIG. 10 is a diagram illustrating a general configuration example of the linear motion device 54, FIG. 10A is a top view of the linear motion device 54, and FIG. 10B is a diagram of FIG. It is the figure seen from the axial direction.
As shown in FIG. 10, the linear motion device 54 includes a rolling screw device 1 composed of a ball screw, two linear guides 56 a and 56 b disposed on both sides of the rolling screw device 1, and a bracket 58. I have. The detailed configuration of the rolling screw device 1 will be described later. In FIG. 10, the guide rails 60 included in the linear guides 56a and 56b are indicated as guide rails 60a and 60b, respectively.
The bracket 58 is assembled to the nut 4 provided in the rolling screw device 1 and the sliders 62a and 62b provided in the linear guides 56a and 56b, respectively. When the screw shaft 2 rotates, the screw shaft together with the nut 4 and the sliders 62a and 62b. It moves along the axial direction of 2.

FIG. 11 is a cross-sectional view taken along the line AA in FIG. 10 and is a diagram illustrating a configuration of the rolling screw device 1.
As shown in FIG. 11, the rolling screw device 1 includes a screw shaft 2 having a spiral screw shaft side rolling groove 6 on the outer peripheral surface, an outer peripheral side of the screw shaft 2, and a screw A nut 4 having a nut-side rolling groove 8 facing the shaft-side rolling groove 6 on the inner peripheral surface, and a lubricant supplier 16 containing a lubricant are provided.
In a load rolling path 10 formed between the screw shaft side rolling groove 6 and the nut side rolling groove 8, a plurality of rolling elements 12, such as ceramic balls, are loaded in a freely rolling manner. These rolling elements 12 are configured to roll in the load rolling path 10 as the screw shaft 2 or the nut 4 rotates.

  The lubricant supply body 16 is formed in an annular shape, is disposed inside the nut-side cap 22 attached to the end surface of the nut 4, and the inner peripheral surface thereof is in sliding contact with the outer peripheral surface of the screw shaft 2. The contained lubricant is supplied to the outer peripheral surface of the screw shaft 2. Then, by supplying a lubricant between the load rolling path 10 and the rolling element 12 via the outer peripheral surface of the screw shaft 2, wear of the load rolling path 10 and the rolling element 12, and the load rolling path Heating due to friction between the rolling elements 10 and the rolling elements 12 is prevented.

The nut-side cap 22 is formed in a cylindrical shape and has a plurality of through holes 64 that penetrate the outer peripheral surface in the radial direction. The lubricant supply body 16 is disposed on the end side of the nut 4 by inserting mounting screws 66 from the outer peripheral side of the nut side cap 22 into the plurality of through holes 64 of the nut side cap 22.
Moreover, as a structure which arrange | positions a lubricant supply body to the end surface of a nut different from what was shown in FIG. 11, as described in patent document 1, for example, the attachment extended in the axial direction of a screw shaft There exists a thing of the structure which arrange | positions a lubricant supply body to the edge part side of a nut using a screw | thread.
Japanese Patent No. 3796972 (FIG. 1)

In general, the life of a ball screw is about 10 years. On the other hand, the lifetime of the lubricant supply body is about 5 years. For this reason, it is necessary to replace the lubricant supplier every certain period.
However, in the configuration in which the lubricant supply body is disposed on the end surface of the nut in the conventional ball screw including the configuration described in Patent Document 1, the mounting screw can be removed while the linear motion device is configured. It is difficult to remove the lubricant supply from the nut. For example, in the rolling screw device 1 included in the linear motion device 54 shown in FIG. 10, it is difficult to use a tool such as a screwdriver in the range surrounded by an ellipse C in the drawing and its surroundings. Is difficult.

Therefore, in the replacement work of the lubricant supply body, it is necessary to disassemble the linear motion device, so there is a possibility that the stop time of the linear motion device may be prolonged, and the operational efficiency of the linear motion device is reduced. There is a risk of problems.
The present invention has been made paying attention to the above problems, and provides a nut and a rolling screw device including the nut that can improve the working efficiency in replacing the lubricant supply body. Let it be an issue.

In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention is arranged on the outer peripheral side of a screw shaft having a spiral screw shaft side rolling groove on the outer peripheral surface, and on the screw shaft side. A nut having a spiral nut-side rolling groove facing the rolling groove on the inner peripheral surface,
Lubricant supply body that contains a lubricant and supplies the contained lubricant to the outer peripheral surface of the screw shaft, and a lubricant supply body attaching / detaching means for detachably attaching the lubricant supply body to the end side of the nut And comprising
The lubricant supply body attaching / detaching means includes a plurality of hooking portions extending along an end surface of the nut, and a plurality of hooking portions hooked on the plurality of hooking portions,
One of the hook part and the hook part is provided on the end side of the nut, and the other of the hook part and the hook part is provided on the lubricant supply body,
The hooked portion is hooked to the hooking portion by relative displacement in a predetermined hooking direction along an end surface of the nut with respect to the hooking portion,
The hooking portion protrudes in a direction along the axial direction of the screw shaft, extends in an arc shape along the circumferential direction of the screw shaft, and is hooked on the hooking portion. of, we have a relative displacement restricting means for restricting the relative displacement of the said latching direction with respect to the engaging portion,
By rotating the latched portion relative to the latching portion in the circumferential direction of the screw shaft, the latched portion is latched with the latched portion, or the latched portion is hooked from within the latched portion. Remove the stop
When the screw shaft moves from the inside of the nut toward the lubricant supply body side, the lubricant supply body rotates in the same direction as the rotation direction of the screw shaft when viewed from the axial direction of the screw shaft. When the latching portion is latched to the latching portion and the lubricant supply body rotates in a direction opposite to the rotation direction of the screw shaft as viewed from the axial direction of the screw shaft, the latched portion is moved to the latching portion. It is characterized by being removed from .

According to the present invention, the hooked portion can be hooked to the hooking portion by being relatively displaced in the predetermined hooking direction along the end surface of the nut with respect to the hooking portion. The lubricant supply body can be attached to the nut without using a member such as.
Further, according to the present invention, the latching portion has the relative displacement regulating means for regulating the relative displacement of the latched portion latched by the latching portion in the latching direction with respect to the latching portion. The state in which the hooked portion is hooked on the hooking portion is maintained, and it becomes easy to hold the state in which the lubricant supply body is attached to the nut.
In addition, according to the present invention, the latching portion is engaged with the latching portion by rotating the latching portion relative to the latching portion in the circumferential direction of the screw shaft. Since the stop portion can be removed, it is easy to attach and detach the lubricant supply body to the nut even in a narrow space around the lubricant supply body.
Further, according to the present invention, when the screw shaft moves from the inside of the nut toward the lubricant supply body, the lubricant supply body rotates in the same direction as the rotation direction of the screw shaft as viewed from the axial direction of the screw shaft. The hooked portion is hooked on the hooking portion.
For this reason, even if the screw shaft rotates and the lubricant supply body is pressed and urged away from the end face of the nut by the screw shaft, the state where the hooked portion is hooked on the hooking portion is maintained. Therefore, the state where the lubricant supply body is disposed on the end side of the nut is maintained.

According to the present invention, when the screw shaft moves from the inside of the nut toward the lubricant supply body, the lubricant supply body rotates in the same direction as the rotation direction of the screw shaft as viewed from the axial direction of the screw shaft. The latching part is latched on the latching part.
For this reason, even if the screw shaft rotates and the lubricant supply body is pressed and urged away from the end face of the nut by the screw shaft, the state where the hooked portion is hooked on the hooking portion is maintained. Therefore, the state where the lubricant supply body is disposed on the end side of the nut is maintained.

Further, according to the present invention, when the screw shaft moves from the inside of the nut toward the lubricant supply body, when the lubricant supply body rotates in a direction opposite to the rotation direction of the screw shaft as viewed from the axial direction of the screw shaft. The hooked portion is removed from the hooked portion.
For this reason, even if the screw shaft rotates and the hooked portion is removed from the hooked portion, the lubricant supply body is pressed and urged to the end surface of the nut by the screw shaft. The state of being arranged on the end side is maintained.

Next, of the present invention, the invention described in claim 2 is the invention described in claim 1 , comprising a nut-side cap attached to an end face of the nut,
The latching portion is provided on the nut-side cap,
The hooked portion is provided in the lubricant supply body.
According to the present invention, since the latching portion is provided on the nut-side cap attached to the end surface of the nut and the latching portion is provided on the lubricant supply body, the nut end side can be changed without changing the configuration of the nut. It is possible to dispose a lubricant supplier.

Next, of the present invention, the invention described in claim 3 is the invention described in claim 1 , comprising a nut-side cap attached to the end face of the nut,
The lubricant supply body includes a housing member that houses the lubricant supply body therein,
The latching portion is provided on the nut-side cap,
The said latching part is provided in the said accommodating member, It is characterized by the above-mentioned.
According to the present invention, the housing member that houses the lubricant supply body is disposed on the nut end portion side, the hook portion is provided on the nut of the housing member, and the nut side cap attached to the end surface of the nut is hooked. Since the stop portion is provided, it is possible to prevent the lubricant contained in the lubricant supply body from being scattered and exuded to the outside.

Next, among the present inventions, the invention described in claim 4 is the invention described in claim 3 , wherein the housing member is a light transmitting device that allows the lubricant supply body housed therein to be visually recognized from the outside. It is formed by the material which has property.
According to the present invention, since the housing member is formed of a material having optical transparency that allows the lubricant supply body housed inside to be visually recognized from the outside, the deterioration of the lubricant supply body housed inside the housing member. The state can be visually recognized from the outside.

Next, among the present inventions, the invention described in claim 5 is the invention described in claim 3 or 4 , wherein the rotation suppressing recess formed in the lubricant supply body and the housing member are formed. And an accommodating member side rotation suppressing convex portion that fits into the rotation suppressing concave portion,
The accommodating member-side rotation suppression recess includes a first rotation suppression recess that is continuous with a surface facing the end surface of the nut of the lubricant supply body and an outer peripheral surface of the lubricant supply body, and the lubricant supply body. And a second rotation-suppressing recess that is continuous with the surface opposite to the end surface of the nut and the outer peripheral surface of the lubricant supply body.

According to the present invention, since the housing member side rotation restraining convex portion that fits into the rotation restraining concave portion formed in the lubricant supply body is formed in the housing member, the housing with respect to the screw shaft of the lubricant supply body is accommodated. Rotation independent of the member is suppressed.
For this reason, rotation independent of the nut with respect to the screw shaft of the lubricant supply body is suppressed, and the lubricant supply body and the nut rotate together with respect to the screw shaft, so that deterioration of the lubricant supply body is suppressed.

Further, according to the present invention, the first rotation suppression recess is continuous with the surface facing the end surface of the nut of the lubricant supply and the outer peripheral surface of the lubricant supply, and the second rotation suppression recess is The surface opposite to the surface facing the end surface of the nut of the lubricant supply body and the outer peripheral surface of the lubricant supply body are continuous.
For this reason, it becomes possible to suppress rotation of the lubricant supply body inside the storage member regardless of the assembly direction of the lubricant supply body with respect to the storage member.

Next, among the present inventions, the invention described in claim 6 is the invention described in any one of claims 2 to 5 , wherein the rotation suppressing recess formed in the lubricant supply body and And a nut-side rotation-suppressing convex portion that is formed on the nut-side cap and engages with the rotation-suppressing concave portion.
According to the present invention, since the nut-side rotation suppression convex portion that fits into the rotation suppression concave portion formed in the lubricant supply body is formed in the nut-side cap, the nut with respect to the screw shaft of the lubricant supply body Rotation independent from the side cap is suppressed.

For this reason, rotation independent of the nut with respect to the screw shaft of the lubricant supply body is suppressed, and the lubricant supply body and the nut rotate together with respect to the screw shaft, so that deterioration of the lubricant supply body is suppressed.
According to the present invention, since the nut-side rotation suppressing convex portion is formed on the nut-side cap, the structure of the housing member can be simplified as compared with the invention described in claim 7. It becomes possible.

Next, among the present inventions, the invention described in claim 7 is the invention described in any one of claims 2 to 6 , and is a surface of the nut-side cap that faces the lubricant supply body. In addition, a deviation suppressing portion that suppresses a deviation from the hooking portion of the hooked portion that protrudes toward the lubricant supply body side by elastic force and is hooked on the hooking portion, is formed.
The deviation restraining portion is elastically deformed by a pressing force from the lubricant supply side toward the end surface of the nut, and the deviation of the latched portion latched by the latching portion from the latching portion. It is characterized by allowing.

According to the present invention, the surface of the nut-side cap that faces the lubricant supply body protrudes toward the lubricant supply body by elastic force, and the deviation of the hooked portion that is hooked on the hooking portion from the hooking portion is prevented. The deviation control part which controls is formed.
For this reason, even if the screw shaft and the nut rotate relative to each other, since the deviation of the hooked portion from the hooked portion is suppressed, the state where the hooked portion is hooked to the hooking portion is maintained, The state where the lubricant supply body is disposed on the end side of the nut is maintained.

Further, according to the present invention, the deviation suppression portion formed on the surface of the nut-side cap facing the lubricant supply body is elastically deformed by the pressing force from the lubricant supply side to the end surface side of the nut, and the latching portion The deviation of the to-be-latched part latched on the hook is allowed.
For this reason, by pressing and biasing the departure restraining part from the lubricant supply side to the end face side of the nut, the departure restraining part is deformed and the hooked part can be removed from the latching part. The operation of removing the agent supply body from the nut becomes easy.

Next, among the present inventions, the invention described in claim 8 is the invention described in any one of claims 2 to 7 , wherein the nut-side cap and the screw shaft are arranged between the screw shaft and the screw shaft. A dustproof member that suppresses entry of foreign matter into the load rolling path including the screw shaft side rolling groove and the nut side rolling groove is arranged.
According to the present invention, the dust-proof member is arranged between the nut-side cap and the screw shaft to prevent foreign matter from entering the load rolling path including the screw shaft-side rolling groove and the nut-side rolling groove. Therefore, it becomes possible to improve the operability of the rolling screw device provided with the nut.

Next, among the present inventions, the invention described in claim 9 is a rolling screw device comprising the nut described in any one of claims 1 to 8 .
According to the present invention, the attaching and detaching operations of the lubricant supply body to the nut are facilitated, so that it is possible to improve the work efficiency in replacing the lubricant supply body and to maintain the lubrication state of the rolling screw device. It becomes easy.

  According to the present invention, since it is possible to improve the work efficiency in replacing the lubricant supply body, it is possible to shorten the time for stopping the linear motion device in the replacement work of the lubricant supply body. It is possible to improve the operating efficiency of the moving device.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, the configuration of the present embodiment will be described with reference to FIGS.
FIG. 1 is a diagram illustrating a part of a ball screw that is an example of the present embodiment.
As shown in FIG. 1, a rolling screw device 1 according to this embodiment is provided in a linear motion device (not shown) such as a transport machine, and includes a ball screw provided with a screw shaft 2 and a nut 4. It is.

The screw shaft 2 has a spiral screw shaft side rolling groove 6 on the outer peripheral surface, and is connected to a rotational power source (not shown) such as a motor.
The nut 4 is disposed on the outer peripheral side of the screw shaft 2 and has a nut-side rolling groove 8 facing the screw shaft-side rolling groove 6 on the inner peripheral surface. In a load rolling path 10 formed between the screw shaft side rolling groove 6 and the nut side rolling groove 8, for example, a plurality of rolling elements 12 formed of ceramic balls can freely roll. Is loaded.

A return tube 14 is fixed to the outer peripheral surface of the nut 4. In this embodiment, the rolling screw device 1 in which two return tubes 14 are attached to one nut 4 will be described as an example.
That is, in the rolling screw device 1 of the present embodiment, a plurality of rolling elements 12 roll in the load rolling path 10 with the rotational movement of the screw shaft 2 (or nut 4), and the nut 4 (or screw shaft 2). ) Is configured to linearly move along the axial direction of the screw shaft 2 through the rolling of the rolling element 12.

  The plurality of rolling elements 12 that roll in the load rolling path 10 in accordance with the rotational movement of the screw shaft 2 (or the nut 4) are connected to the return tube 14 from one end of the return tube 14 attached to the nut 4. It is scooped in. The rolling element 12 scooped up into the return tube 14 passes through the return tube 14, and the rolling element 12 that has passed through the return tube 14 returns from the other end of the return tube 14 into the load rolling path 10. It is. That is, the infinite circulation passage of the rolling element 12 is formed by the load rolling path 10 and the return tube 14.

Moreover, the nut 4 is provided with the lubricant supply body 16, the accommodating member 18, the lubricant supply body attaching / detaching means 20, and the nut side cap 22 in the both end surfaces, respectively. In the following description, the lubricant supply body 16, the housing member 18, the lubricant supply body attaching / detaching means 20, and the nut-side cap 22 provided on one of the both end faces of the nut 4 will be described.
FIG. 2 is a perspective view of the lubricant supply body 16 as viewed from the axial direction of the screw shaft 2.
As shown in FIG. 2, the lubricant supply body 16 is formed by combining two supply body constituting members 16a and 16b formed in a semicircular shape, and has an annular shape as a whole.

The inner peripheral surface of the lubricant supply body 16 is in sliding contact with the outer peripheral surface of the screw shaft 2 (see FIG. 1).
Concave grooves 24 that are continuous over the entire circumference are formed on the outer peripheral surface of the lubricant supply body 16, specifically, on the outer peripheral surfaces of the supply member constituting members 16 a and 16 b. An annular garter spring 26 that couples the supply member constituting members 16a and 16b combined with each other by being pressed and biased to each other is disposed (see FIG. 1).

Further, the supply member constituting members 16a and 16b are formed with a first rotation suppression recess 28a and a second rotation suppression recess 28b. The first rotation suppression recess 28a and the second rotation suppression recess 28b. Are opposed to each other with the concave groove 24 therebetween.
The first rotation suppression recess 28a is continuous with the outer peripheral surface of the lubricant supply 16 and the surface of the lubricant supply 16 facing the end surface of the nut 4, and the second rotation suppression recess 28b is a lubricant. The outer peripheral surface of the supply body 16 and the surface opposite to the end surface of the nut 4 of the lubricant supply body 16 are continuous.

A synthetic resin containing a lubricant is used as a material for forming the lubricant supply body 16, and a polyolefin-based synthetic resin is used as the synthetic resin. Specifically, polyethylene, polypropylene, polymethylpentene, or the like can be used as the polyolefin-based synthetic resin.
Polyethylene is used by mixing a low to medium molecular weight having a number average molecular weight of 10,000 to less than 1,000,000 and an ultrahigh molecular weight having a number average molecular weight of 1,000 to 6,000,000. Among them, the ultra-high molecular weight polyethylene has poor fluidity when dissolved, so the content ratio of the ultra-high molecular weight polyethylene is suitably about 5 to 10% by weight in the total composition of the injection molding material. It becomes difficult. On the other hand, if it is less than 5% by weight, the mechanical strength is lowered and it is not practical.

Polypropylene having a number average molecular weight of 100,000 to 400,000 can be used. However, if the oil content is high as in the composition of the present invention, the mechanical strength becomes too low by itself, so that improvement is possible. For the purpose, ultra high molecular weight polyethylene may be added.
It is preferable to use polymethylpentene having a number average molecular weight of 600,000 to 2,000,000.

  As the lubricant contained in the lubricant supplier 16, for example, mineral oil, poly α-olefin oil, alkyl polyphenyl ether oil such as dialkyl diphenyl ether oil and octadecyl diphenyl ether oil, alkyl naphthalene oil such as eicosyl naphthalene and the like are suitable. is there. For the purpose of improving lubricity, an ester oil such as ethylhexyl sebacate may be used as an additive. However, the compatibility between a low-polarity polyolefin synthetic resin and a high-polarity ester oil is poor, so that the product can be retained. In order to lower the oiliness, the mixing amount is preferably 30% by weight or less based on the total oil amount. If ester oil in an amount exceeding 30% by weight is contained, the oil retention becomes worse. As a result, it becomes difficult to contain a large amount of lubricant, and at the same time, the leaching rate of the lubricant becomes too fast and depletes early. End up.

  In the present embodiment, the lubricant supply body 16 is formed by mixing the above-described resin material and the lubricant and heating and melting them, then injecting them into a predetermined mold and cooling and solidifying them while applying pressure. Various additives such as an antioxidant, a rust inhibitor, an antiwear agent, a foam eraser, and an extreme pressure agent are added. Moreover, in order to improve the mechanical strength of the lubricant supply body 16, the following thermoplastic resin and thermosetting resin may be added to the poly α-olefin polymer described above.

  As the thermoplastic resin, resins such as polyamide, polycarbonate, polybutylene terephthalate, polyphenylene sulfide, polyethersulfone, polyetheretherketone, polyamideimide, polystyrene, and ABS resin can be used. Moreover, as thermosetting resin, it is possible to use each resin, such as unsaturated polyester resin, urea resin, melamine resin, phenol resin, polyimide resin, epoxy resin.

FIG. 3 is a perspective view of the housing member 18 as seen from the axial direction of the screw shaft 2.
As shown in FIG. 3, the housing member 18 has a generally open surface facing the end surface of the nut 4, and an opening through which the screw shaft 2 can be inserted into a surface opposite to the surface facing the end surface of the nut 4. It is formed in a cylindrical shape having a portion, and the lubricant supply body 16 can be accommodated therein.
On the inner peripheral surface of the housing member 18, the rotation suppressing recess 28 formed in the lubricant supply body 16 in a state where the lubricant supply body 16 is housed in the housing member 18, specifically, the second rotation A housing member side rotation restraining convex portion 30 that fits into the restraining concave portion 28b is formed. Therefore, the rotation suppressing recess 28 and the housing member side rotation suppressing projection 30 prevent the lubricant supply body 16 from rotating independently of the housing member 18 with respect to the screw shaft 2. Rotation independently of the rotation is suppressed.

As a material for forming the housing member 18, a material having light permeability such as transparent or translucent plastic that allows the lubricant supply body 16 housed therein to be visually recognized from the outside is used.
The lubricant supply body attaching / detaching means 20 includes a plurality of hooked portions 32 and a plurality of hooking portions 34.
Each hooked portion 32 is provided on the surface of the housing member 18 that faces the end surface of the nut 4, and is formed in a shape that projects from the outer circumferential surface of the housing member 18 toward the outer circumferential side of the nut 4.

FIG. 4 is a perspective view of the end surface of the nut 4 shown in FIG. 1 as viewed from the axial direction of the screw shaft 2.
As shown in FIG. 4, the nut-side cap 22 is attached to the end surface of the nut 4, and each latching portion 34 is provided on the surface facing the latched portion 32.
When the nut-side cap 22 is attached to the end surface of the nut 4, a cap fixing screw (not shown) is inserted into the nut-side dust-proof member attachment hole 36 formed in the nut 4, and the tip of the nut-side cap 22 is attached to the nut side. The outer peripheral surface of the cap 22 is pressed and urged.

Each latching portion 34 has a relative displacement restricting means 38, protrudes in a direction along the axial direction of the screw shaft 2, extends in an arc shape along the circumferential direction of the screw shaft 2, and is covered. It is formed in a shape that fits with the latching portion 32.
The relative displacement restricting means 38 includes an entry / exit permission portion 40 that allows the latched portion 32 to enter and exit the latch portion 34, and an entry / exit permission portion 40 of the latched portion 32 fitted to the latch portion 34. A departure prevention unit 42 is provided to prevent departure from the opposite direction.

  When the screw shaft 2 moves from the inside of the nut 4 toward the lubricant supply body 16 side, the entrance / exit permission portion 40 rotates with the screw shaft 2 when the lubricant supply body 16 is viewed from the axial direction of the screw shaft 2. It is formed in the direction opposite to the direction to be performed. In the present embodiment, a case where the direction in which the entry / exit permission portion 40 is formed is a clockwise direction of the hook portion 34 when viewed from the axial direction of the screw shaft 2 will be described.

  When the screw shaft 2 moves from the inside of the nut 4 toward the lubricant supply body 16, the deviation prevention unit 42 rotates the lubricant supply body 16 together with the screw shaft 2 when viewed from the axial direction of the screw shaft 2. The latching portion 34 is closed when viewed from the circumferential direction of the screw shaft 2. In the present embodiment, a case where the direction in which the departure prevention part 42 is formed is a counterclockwise direction when viewed from the axial direction of the screw shaft 2 in the hooking part 34 will be described.

As described above, the relative displacement regulating means 38 is configured to allow relative displacement of the latched portion 32 latched by the latching portion 34 in only one direction along the end surface of the nut 4 with respect to the latching portion 34. The permissible direction is a predetermined hooking position where the hooked portion 32 is hooked on the hooking portion 34 when the hooked portion 32 is displaced relative to the hooking portion 34 along the end surface of the nut 4. Stopping direction.
Further, the deviation preventing portion 42 restricts relative displacement of the hooked portion 32 hooked to the hooking portion 34 in the hooking direction with respect to the hooking portion 34.

Therefore, the housing member 18 is rotated in the counterclockwise direction when viewed from the axial direction of the screw shaft 2, and the hooked portion 32 is rotated in the counterclockwise direction when viewed from the axial direction of the screw shaft 2. Thus, when the hooked portion 32 and the hooking portion 34 are fitted, the hooked portion 32 is hooked to the hooking portion 34. The housing member 18 is disposed on the end side of the nut 4, and the lubricant supply body 16 is disposed on the end surface of the nut 4.
Further, the housing member 18 is rotated in the clockwise direction when viewed from the axial direction of the screw shaft 2, and the hooked portion 32 is rotated in the clockwise direction when viewed from the axial direction of the screw shaft 2. When the latched portion 32 is removed from the latch portion 34, the housing member 18 is detached from the end surface of the nut 4, and the lubricant supply body 16 is detached from the end surface of the nut 4.

As described above, the lubricant supply body attaching / detaching means 20 rotates the hooked portion 32 relative to the hooking portion 34 in the circumferential direction of the screw shaft 2 so that the hooked portion 32 and the hooking portion 34 are fitted to each other. By doing so, the lubricant supply body 16 is detachably disposed on the end face of the nut 4.
Also, the lubricant supply body attaching / detaching means 20 removes the hooked portion 32 from the hooked portion 34 by rotating the hooked portion 32 relative to the hooked portion 34 in the circumferential direction of the screw shaft 2. The lubricant supply body 16 is removed from the end surface of the nut 4.

Next, operations and effects of the rolling screw device 1 having the above-described configuration will be described with reference to FIGS. 1 to 4 and FIG.
First, referring to FIG. 5, the old lubricant supply body in the work of replacing the old lubricant supply body 16 that has deteriorated due to wear or the like that occurs during the operation of the rolling screw device 1 or aged, with a new lubricant supply body. A procedure for removing 16 from the nut 4 will be described.

FIG. 5 is a diagram showing a procedure for removing the lubricant supplier 16 from the nut 4, and shows a state in which the removal operation proceeds in the order of FIG. 5 (a) to FIG. 5 (e).
In the operation of removing the lubricant supply body 16 from the nut 4, first, as shown in FIG. 5A, the housing member 18 is rotated in the clockwise direction when viewed from the axial direction of the screw shaft 2. The hooked portion 32 fitted in the stop portion 34 is rotated in the clockwise direction when viewed from the axial direction of the screw shaft 2. When the latching portion 32 rotates in the clockwise direction when viewed from the axial direction of the screw shaft 2, the latching portion 32 is removed from the latching portion 34.

Next, as shown in FIG. 5B, the housing member 18 and the lubricant supply body 16 are separated from the end face of the nut 4, the housing member 18 is removed from the end face of the nut 4, and the lubricant supply body 16 is removed. Remove from the end face of the nut 4.
Then, as shown in FIG. 5C, the lubricant is supplied from the inside of the housing member 18 by moving only the lubricant supplier 16 toward the end face side of the nut 4 with the housing member 18 fixed. The supply body 16 is extracted.

  After extracting the lubricant supply body 16 from the inside of the housing member 18, as shown in FIG. 5D, the garter spring 26 is taken out from the concave groove 24 formed on the outer peripheral surface of the lubricant supply body 16, The coupling state of the supply member constituting members 16a and 16b is released. At this time, the garter spring 26 is held on the outer peripheral side of the screw shaft 2 without being cut because it is used in an attaching operation described later.

After the garter spring 26 is taken out from the concave groove 24, as shown in FIG. 5 (e), the supply member constituting members 16a and 16b are separated and removed from the outer peripheral side of the screw shaft 2, and the old lubricant supply member 16 is removed. The operation of removing from the nut 4 is completed.
After the old lubricant supply body 16 is removed, a new lubricant supply body 16 is housed in the housing member 18, the housing member 18 is attached to the end face of the nut 4, and the replacement operation of the lubricant supply body 16 is completed. To do.
When the new lubricant supply body 16 is housed in the housing member 18, first, the body constituting members 16 a and 16 b are combined with each other so that the inner peripheral surface thereof is in contact with the outer peripheral surface of the screw shaft 2. By disposing the garter spring 26 in the groove 24, the supply member constituting members 16a and 16b are joined to form the lubricant supply member 16 (see FIGS. 1 and 2).

Next, the second rotation suppressing concave portion 28 b formed on the outer peripheral surface of the lubricant supply body 16 is fitted to the accommodating member side rotation suppressing convex portion 30 formed on the inner peripheral surface of the accommodating member 18. Then, the lubricant supply body 16 is housed in the housing member 18 (see FIGS. 1 to 3).
And the accommodating member 18 which accommodated the new lubricant supply body 16 is attached to the end surface of the nut 4, and the replacement | exchange operation | work of the lubricant supply body 16 is complete | finished.
The procedure for attaching the housing member 18 containing the new lubricant supply body 16 to the end face of the nut 4 is the same as the operation of removing the old lubricant supply body 16 in the order from FIG. 5 (d) to FIG. 5 (a). Proceed in reverse order.

Therefore, in the rolling screw device 1 of the present embodiment, the lubricant supply body attaching / detaching means 20 that detachably disposes the lubricant supply body 16 to the end face of the nut 4 extends along the end face of the nut 4. In addition, a hooked portion 32 and a hooking portion 34 that are fitted to each other are provided.
In addition, the relative displacement regulating means 38 of the latching portion 34 includes an entrance / exit allowing portion 40 that allows the latched portion 32 to enter and exit from the latching portion 34, and the latched portion fitted to the latching portion 34. 32 has a departure prevention part 42 for preventing a departure from the opposite direction to the 32 entry / exit permission part 40.

For this reason, the to-be-latched part 32 and the to-be-latched part 34 are fitted by moving the to-be-latched part 32 along the end surface of the nut 4 from the entrance / exit permission part 40 side to the deviation prevention part 42 side. Therefore, it becomes easy to attach the lubricant supply body 16 to the nut 4 without using a member such as a screw.
Further, the hooked portion 32 fitted to the hooking portion 34 is moved by moving the hooked portion 32 fitted to the hooking portion 34 along the end face of the nut 4 toward the entrance / exit allowing portion 40 side. Since it becomes possible to remove from the inside of the latch part 34, it becomes easy to remove the lubricant supply body 16 from the nut 4. FIG.

As a result, it is possible to replace the deteriorated old lubricant supply body 16 with a new lubricant supply body 16 without disassembling the linear motion device including the rolling screw device 1.
As described above, since it becomes possible to improve the efficiency in the operation of replacing the deteriorated old lubricant supply body 16 with the new lubricant supply body 16, the time for stopping the linear motion device provided with the rolling screw device 1 is reduced. It is possible to shorten the time, and it is possible to improve the operation efficiency of the linear motion device.

Further, in the rolling screw device 1 of the present embodiment, the lubricant supply body attaching / detaching means 20 rotates the hooked portion 32 relative to the hooking portion 34 in the circumferential direction of the screw shaft 2, thereby The part 32 and the latching part 34 can be fitted to each other, or the latched part 32 can be removed from the latching part 34.
For this reason, even if the periphery of the lubricant supply body 16 is a narrow space, the attaching and detaching work of the lubricant supply body 16 to the nut 4 is facilitated, and the deteriorated old lubricant supply body 16 is replaced with a new lubricant supply body 16. It is possible to improve the efficiency in the work of exchanging.

Furthermore, in the rolling screw device 1 according to the present embodiment, when the screw shaft 2 moves from the inside of the nut 4 toward the lubricant supply body 16 side, the access allowance portion 40 is moved from the axial direction of the screw shaft 2. As seen, the lubricant supply body 16 is formed in a direction opposite to the direction rotating with the screw shaft 2.
Further, when the screw shaft 2 moves from the inside of the nut 4 toward the lubricant supply body 16 side, the deviation prevention section 42 is configured so that the lubricant supply body 16 is not screwed into the screw shaft 2 as viewed from the axial direction of the screw shaft 2. It is formed in the direction of rotation together.

For this reason, even if the screw shaft 2 rotates and the hooked portion 32 deviates from the hook portion 34, the lubricant supply body 16 is pressed and urged by the screw shaft 2 toward the end surface of the nut 4. The state where the lubricant supply body 16 is disposed on the end side of the nut 4 is maintained.
Even if the screw shaft 2 rotates and the lubricant supply body 16 is pressed and urged away from the end face of the nut 4 by the screw shaft 2, the hooked portion 32 is fitted to the hooking portion 34. Therefore, the state in which the lubricant supply body 16 is disposed on the end side of the nut 4 is maintained.

As a result, it is prevented that the arrangement state of the lubricant supply body 16 with respect to the end face of the nut 4 is changed depending on the operation state of the rolling screw device 1, so that the lubricating state of the rolling screw device 1 is stabilized, and the rolling screw device 1. It becomes possible to stabilize the operability.
Further, in the rolling screw device 1 of the present embodiment, since the latching portion 34 is provided on the nut-side cap 22 attached to the end face of the nut 4, the configuration of the nut 4 is not changed from the conventional one. The lubricant supply body 16 can be disposed on the end surface of the nut 4.

Further, in the rolling screw device 1 of the present embodiment, the housing member 18 that houses the lubricant supply body 16 is disposed on the end side of the nut 4, and the hooked portion 32 provided on the housing member 18. And the latching part 34 provided in the nut side cap 22 is fitted, and the lubricant supply body 16 is disposed on the end face of the nut 4.
For this reason, it becomes possible to prevent the lubricant contained in the lubricant supply body 16 from scattering and exuding to the outside.

Further, in the rolling screw device 1 of the present embodiment, the rotation suppressing concave portion 28 formed in the lubricant supply body 16 and the accommodating member side rotation suppressing convex portion 30 formed on the inner peripheral surface of the accommodating member 18 are provided. Thus, the lubricant supply body 16 is prevented from rotating independently of the housing member 18 with respect to the screw shaft 2.
For this reason, during the operation of the rolling screw device 1, the rotation of the lubricant supply body 16 independent of the nut 4 with respect to the screw shaft 2 is suppressed, and the lubricant supply body 16 and the nut 4 rotate together with respect to the screw shaft 2. Therefore, deterioration of the lubricant supply body 16 can be suppressed, and the life of the lubricant supply body 16 can be extended.

  Further, in the rolling screw device 1 of the present embodiment, the outer peripheral surface of the lubricant supply body 16 and the surface facing the end surface of the nut 4 of the lubricant supply body 16 are continuously provided on the outer peripheral surface of the lubricant supply body 16. A first rotation suppression recess 28a, and a second rotation suppression recess 28b that is continuous with the outer surface of the lubricant supply 16 and the surface opposite to the surface of the lubricant supply 16 that faces the end surface of the nut 4. Is formed. Further, the first rotation suppression concave portion 28a and the second rotation suppression concave portion 28b are disposed to face each other with the concave groove 24 therebetween.

For this reason, regardless of the assembly direction of the lubricant supply body 16 with respect to the housing member 18, it is possible to suppress the rotation of the lubricant supply body 16 inside the housing member 18, and to suppress deterioration of the lubricant supply body 16. It becomes possible to do.
Further, in the rolling screw device 1 according to the present embodiment, as a material for forming the housing member 18, the lubricant supply body 16 housed inside such as transparent or translucent plastic has a light transmissibility that can be seen from the outside. The material which has is used.
For this reason, the deterioration state of the lubricant supply body 16 housed in the housing member 18 can be visually recognized from the outside, and the deterioration state of the lubricant supply body 16 can be easily confirmed visually.

  In the rolling screw device 1 according to this embodiment, the lubricant supply body attaching / detaching means 20 rotates the hooked portion 32 relative to the hooking portion 34 in the circumferential direction of the screw shaft 2, thereby holding the hooked portion 32. However, the present invention is not limited to this. However, the present invention is not limited to this. That is, the lubricant supply body attaching / detaching means 20 has, for example, a shape in which the hooked portion 32 and the hooked portion 34 extend in the radial direction of the screw shaft 2, and shapes of the lubricant supply body 16 and the housing member 18. Is formed in a substantially U shape when viewed from the axial direction of the screw shaft 2, and the hooked portion 32 is moved relative to the hooking portion 34 in the radial direction of the screw shaft 2, thereby It is good also as a structure which can fit 32 and the latching | locking part 34 mutually, or can remove the to-be-latched part 32 from the latching part 34 inside. In this case, for example, even if other members such as a linear guide are present below and on the side of the rolling screw device 1, if there is a space above the lubricant supply body without disassembling the linear motion device, It is possible to perform the attaching / detaching work to the 16 nuts 4. However, like the rolling screw device 1 of the present embodiment, the lubricant supply body attaching / detaching means 20 is rotated by rotating the hooked portion 32 relative to the hooking portion 34 in the circumferential direction of the screw shaft 2. The configuration in which the portion 32 and the latching portion 34 can be fitted to each other, or the latched portion 32 can be removed from the latching portion 34 is a space around the lubricant supply body 16. This is also preferable because it is easy to attach and detach the lubricant supply body 16 to / from the nut 4.

Moreover, in the rolling screw device 1 of the present embodiment, a synthetic resin containing a lubricant is used as a material for forming the lubricant supply body 16, but the material for forming the lubricant supply body 16 is limited to this. Is not to be done. That is, as a material for forming the lubricant supply body 16, a material capable of smoothly supplying the lubricant impregnated in the lubricant supply body 16 to the outer peripheral surface of the screw shaft 2, for example, wool mixed polyester felt or the like. It may be used.
Furthermore, in the rolling screw device 1 of the present embodiment, the rolling screw device 1 is a ball screw in which the rolling element 12 is a ball. However, the present invention is not limited to this, and the rolling screw device 1 is replaced by the rolling element 12. It is good also as a roller screw which is a roller.

  Further, in the rolling screw device 1 of the present embodiment, the lubricant supply body 16 rotates independently from the nut 4 with respect to the screw shaft 2 by the rotation suppressing concave portion 28 and the housing member side rotation suppressing convex portion 30. However, the present invention is not limited to this. That is, for example, the configuration may be such that the rotation suppressing concave portion 28 and the housing member side rotation suppressing convex portion 30 are not provided. However, like the rolling screw device 1 of the present embodiment, it is possible to suppress the deterioration of the lubricant supply body 16 by including the rotation suppressing concave portion 28 and the housing member side rotation suppressing convex portion 30. Therefore, the life of the lubricant supply body 16 can be extended, which is preferable.

  Further, in the rolling screw device 1 of the present embodiment, the first rotation suppression concave portion 28a and the second rotation suppression concave portion that are disposed opposite to each other on the outer peripheral surface of the lubricant supply body 16 with the concave groove 24 therebetween. Although 28b was formed, it is not limited to this. That is, only one of the first rotation suppression concave portion 28 a and the second rotation suppression concave portion 28 b may be formed on the outer peripheral surface of the lubricant supply body 16. However, as in the rolling screw device 1 of the present embodiment, forming the first rotation suppression concave portion 28a and the second rotation suppression concave portion 28b on the outer peripheral surface of the lubricant supply body 16 is possible. Regardless of the assembly direction of the housing member 18, the rotation of the lubricant supply body 16 inside the housing member 18 can be suppressed, which is preferable.

  Further, in the rolling screw device 1 of the present embodiment, as the material for forming the housing member 18, a material having optical transparency that allows the lubricant supply body 16 housed therein to be visually recognized from the outside is used. Is not to be done. That is, as the material for forming the housing member 18, a material that does not have light permeability that allows the lubricant supply body 16 housed inside to be visually recognized from the outside may be used. However, as in the rolling screw device 1 of the present embodiment, it is possible to easily confirm the deterioration state of the lubricant supplier 16 by using the above-described light-transmitting material as the material for forming the housing member 18. Is preferable.

(Second embodiment)
Next, a second embodiment of the present invention will be described.
First, the configuration of the present embodiment will be described with reference to FIG.
FIG. 6 is a diagram illustrating a part of a ball screw that is an example of the present embodiment.
As shown in FIG. 6, the configuration of the present embodiment is the same as that of the first embodiment described above, except for the configurations of the nut 4 and the lubricant supply body attaching / detaching means 20.

The nut 4 is provided with a lubricant supply body 16, a lubricant supply body attaching / detaching means 20, and a nut-side cap 22 on both end faces thereof. That is, the nut 4 of the present embodiment does not include a housing member, unlike the first embodiment described above. In FIG. 6, only the lubricant supply body 16, the lubricant supply body attaching / detaching means 20, and the nut-side cap 22 provided on one of the both end faces of the nut 4 are shown.
The lubricant supply body attaching / detaching means 20 includes a plurality of hooked portions 32 and a plurality of hooking portions 34.

Each hooked portion 32 is provided on a surface of the lubricant supply body 16 that faces the end surface of the nut 4, and extends along the end surface of the nut 4. Each hooked portion 32 has a shape protruding from the outer peripheral surface of the lubricant supply body 16 toward the outer peripheral side of the nut 4.
When the hooked portion 32 is formed on the lubricant supply body 16, the hooked portion depends on the material strength of the material forming the lubricant supply body 16 and the external force acting on the lubricant supply body 16. Set an intensity of 32. In the present embodiment, as an example, only the portion of the lubricant supplier 16 that constitutes the hooked portion 32 is molded with a resin having a lower oil content than the other portions, and then the other portions are hooked. The lubricant supply body 16 is formed by molding the resin having a higher oil content than the portion constituting the portion 32 and combining them. Thereby, it is possible to improve the strength of the portion constituting the hooked portion 32 of the lubricant supply body 16 as compared with the other portions.

Each latching portion 34 is provided on the nut-side cap 22 and has a shape that opens from the inner peripheral surface of the nut-side cap 22 to the central axis side of the nut 4. Further, the latching portion 34 protrudes in a direction along the axial direction of the screw shaft 2, extends in an arc shape along the circumferential direction of the screw shaft 2, and has a shape that fits with the latched portion 32. Is formed.
Other configurations are the same as those of the first embodiment described above.

Next, with reference to FIG. 6, an effect | action, effect, etc. of the rolling screw apparatus 1 provided with said structure are demonstrated. In the following description, since the configuration other than the nut 4 and the lubricant supply body attaching / detaching means 20 is the same as that of the first embodiment described above, different parts will be mainly described.
In the operation of replacing the old lubricant supply body 16 with a new lubricant supply body, first, the lubricant supply body 16 is rotated in the clockwise direction when viewed from the axial direction of the screw shaft 2, and the latching portion 34. The hooked portion 32 fitted inside is rotated in the clockwise direction when viewed from the axial direction of the screw shaft 2. When the latching portion 32 rotates in the clockwise direction when viewed from the axial direction of the screw shaft 2, the latching portion 32 is removed from the latching portion 34.

Next, the lubricant supply body 16 is separated from the end face of the nut 4, the lubricant supply body 16 is removed from the end face of the nut 4, and the garter spring 26 is formed in a concave groove formed on the outer peripheral face of the lubricant supply body 16. 24, the supply member constituting members 16a and 16b are disconnected from each other.
After the garter spring 26 is taken out from the concave groove 24, the supply member constituting members 16a and 16b are separated and removed from the outer peripheral side of the screw shaft 2, and the operation of removing the old lubricant supply member 16 from the nut 4 is completed.

After the old lubricant supply body 16 is removed, a new lubricant supply body 16 is attached to the end face of the nut 4 and arranged, and the replacement operation of the lubricant supply body 16 is completed.
Therefore, in the rolling screw device 1 of the present embodiment, the lubricant supply body attaching / detaching means 20 is formed by the hooked portion 32 provided on the lubricant supply body 16 and the hooking portion 34 provided on the nut-side cap 22. is doing.

For this reason, compared with the first embodiment described above, the lubricant supply body 16 can be detachably disposed on the end face of the nut 4 without requiring a housing member for housing the lubricant supply body 16 therein. It becomes possible.
As a result, the number of work steps in the replacement work of the lubricant supply body 16 can be reduced, and the efficiency of the replacement work can be improved.
Moreover, the deterioration state of the lubricant supply body 16 can be visually recognized from the outside, and the deterioration state of the lubricant supply body 16 can be easily confirmed.
Other actions and effects are the same as those of the first embodiment described above.

  In the rolling screw device 1 of the present embodiment, when the latching portion 32 is provided in the lubricant supply body 16, the material strength of the material forming the lubricant supply body 16 and the lubricant supply body 16 are affected. Depending on the external force or the like, the strength of the hooked portion 32 is set, and the strength of the portion constituting the hooked portion 32 of the lubricant supply body 16 is improved as compared with other portions. It is not limited. That is, for example, the lubricant supply body 16 may be formed by the same material and the same method to form the lubricant supply body 16. However, as in the rolling screw device 1 of the present embodiment, the lubricant supply body 16 can improve the strength of the portion constituting the hooked portion 32 of the lubricant supply body 16 more than other portions. Since the state arrange | positioned at the edge part side of the nut 4 is hold | maintained, it is suitable.

  Further, in the rolling screw device 1 of the present embodiment, only the portion constituting the hooked portion 32 of the lubricant supplier 16 is molded with a resin having a lower oil content than the other portions, and then the other portions are formed. The lubricant supply body 16 is formed by molding the resin having a higher oil content than the portion constituting the hooked portion 32 and combining the two, but the present invention is not limited to this. That is, for example, a reinforcing member such as a metal plate may be embedded in a portion of the lubricant supply body 16 constituting the hooked portion 32, and the lubricant supply body 16 may be formed by insert molding. Alternatively, the lubricant supplying body 16 may be formed by impregnating a portion of the lubricant supplying body 16 that constitutes the hooked portion 32 with an epoxy resin or the like and then curing it, and then impregnating the lubricant.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
First, the configuration of the present embodiment will be described with reference to FIG.
FIG. 7 is a perspective view of the end surface of the nut 4 as viewed from the axial direction of the screw shaft.
As shown in FIG. 7, the configuration of this embodiment is the same as that of the first embodiment described above, except for the configuration of the nut-side cap 22.
The nut side cap 22 includes a nut side rotation suppressing convex portion 44.
The nut-side rotation suppressing convex portion 44 is formed on the surface of the nut-side cap 22 facing the lubricant supply body, and is fitted to a rotation suppression concave portion (not shown) formed in the lubricant supply body. It is formed into a shape.

The rotation suppressing recess is formed only on the surface of the lubricant supply body facing the nut-side cap 22.
Although not particularly illustrated, in the present embodiment, unlike the first embodiment described above, the housing member, specifically, the housing member side rotation suppressing convex portion is not formed on the inner peripheral surface of the housing member.
Other configurations are the same as those of the first embodiment described above.

Next, operations and effects of the rolling screw device having the above-described configuration will be described with reference to FIG. In the following description, since the configuration other than the nut-side cap 22 is the same as that of the first embodiment described above, the description will focus on different parts.
In a state where the lubricant supply body is arranged on the end side of the nut 4, a rotation suppression concave portion formed in the lubricant supply body and a nut side rotation suppression convex portion formed in the nut side cap 22. 44 is fitted.

For this reason, during operation of the rolling screw device, rotation of the lubricant supply body independent of the nut-side cap 22 with respect to the screw shaft is suppressed, and rotation of the lubricant supply body independent of the nut 4 with respect to the screw shaft is suppressed. .
Therefore, in the rolling screw device of the present embodiment, the nut-side rotation suppression convex portion 44 that fits into the rotation suppression concave portion is formed on the surface of the nut-side cap 22 facing the lubricant supply body.

For this reason, when the rolling screw device is operated, rotation of the lubricant supply body independent of the nut 4 with respect to the screw shaft is suppressed, and the lubricant supply body and the nut 4 rotate together with respect to the screw shaft. The deterioration of the body can be suppressed, and the life of the lubricant supply body can be extended.
Other actions and effects are the same as those of the first embodiment described above.
In the rolling screw device of the present embodiment, the housing member-side rotation suppression convex portion is not formed on the inner peripheral surface of the housing member. However, the present invention is not limited to this. A convex member for suppressing rotation on the housing member side may be formed on the peripheral surface. In this case, the lubricant supply body is formed with the rotation-suppressing recess that fits with the accommodation-member-side rotation suppression protrusion as described above.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
First, the configuration of the present embodiment will be described with reference to FIG.
FIG. 8 is a perspective view of the end surface of the nut 4 as viewed from the axial direction of the screw shaft.
As shown in FIG. 8, the configuration of this embodiment is the same as that of the first embodiment described above except for the configuration of the nut 4.
A deviation suppressing portion 46 is formed on the surface of the nut-side cap 22 facing the lubricant supply body.

The deviation suppressing portion 46 is formed by cutting out a part of a flat portion that is in contact with the end face of the nut 4 of the nut-side cap 22, and extends along the circumferential direction of the screw shaft 2 when viewed from the axial direction of the nut 4. It is formed in a substantially rectangular shape.
The position where the deviation suppressing part 46 is formed is such that the distance from the central axis of the screw shaft 2 is at least a part of the deviation suppressing part 46 from the central axis of the screw shaft 2 at least a part of the access allowance part 40. The position is the same as the distance.

  Of the four sides of the deviation suppressing unit 46, one side that is close to the access allowance unit 40 and two sides that are continuous on both sides are separated from the nut-side cap 22, and elastic force toward the lubricant supply side Therefore, the nut-side cap 22 protrudes toward the lubricant supply side from the flat portion. In addition, of the four sides of the deviation suppressing unit 46, one side opposite to the one close to the access allowance unit 40 is continuous with the nut-side cap 22.

Therefore, since the deviation suppressing part 46 protrudes toward the lubricant supply body in the no-load state, the deviation suppressing part 46 suppresses the displacement of the hooked part fitted to the hooking part 34 toward the entrance / exit allowing part 40 side. On the other hand, when a pressing force is applied to the end face side of the nut 4 from the lubricant supply side, the deformation is caused by this pressing force, and the displacement of the latched portion fitted to the latching portion 34 toward the entrance / exit allowing portion 40 side is changed. Allow.
Other configurations are the same as those of the first embodiment described above.

Next, operations and effects of the rolling screw device having the above configuration will be described with reference to FIG. In the following description, the configuration other than the nut 4 is the same as that of the first embodiment described above, and therefore, different parts will be mainly described.
When the rolling screw device is in operation, the screw shaft and the nut 4 are rotated relative to each other in a direction in which the hooked portion is displaced toward the entrance / exit allowing portion 40 while the hooked portion 34 is engaged with the hooked portion. Since the latched portion comes into contact with the departure restraining portion 46, the displacement of the latched portion fitted to the latching portion 34 toward the entrance / exit allowing portion 40 is suppressed.

On the other hand, when the lubricant supply body is replaced, the lubricant supply body is pressed toward the end face side of the nut 4, thereby pressing the deviation suppressing portion 46 toward the end face side of the nut 4 from the lubricant supply body side. Therefore, the deviation suppressing portion 46 is deformed by this pressing force, and the hooked portion fitted to the hooking portion 34 is allowed to be displaced toward the entrance / exit allowing portion 40 side.
Therefore, in the rolling screw device of this embodiment, the nut-side cap 22 is restrained from being displaced toward the entrance / exit allowing portion 40 side of the hooked portion fitted to the hooking portion 34 in an unloaded state. When a pressing force from the agent supply side toward the end face side of the nut 4 is received, a deviation suppressing portion 46 that allows displacement of the hooked portion fitted to the hooking portion 34 toward the access permitting portion 40 side is formed. Yes.
For this reason, even when the screw shaft and the nut 4 rotate relative to each other when the rolling screw device is operated, the state in which the hooked portion is fitted to the hooking portion 34 is maintained. The state arrange | positioned at the edge part side of 4 is hold | maintained.

On the other hand, at the time of replacement work of the lubricant supply body, the departure suppression portion 46 is deformed and fitted to the latching portion 34 by pressing and urging the departure suppression portion 46 toward the end face side of the nut 4 by the lubricant supply body. Since the displacement of the hooked portion toward the entrance / exit allowing portion 40 is allowed, the operation of removing the lubricant supply body from the nut 4 is facilitated.
As a result, when the rolling screw device is operated, the state in which the lubricant supply body 16 is arranged on the end side of the nut 4 is maintained, and the operating state of the rolling screw device can be stabilized, and the lubricant supply It is possible to improve work efficiency during body replacement work.
Other actions and effects are the same as those of the first embodiment described above.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.
First, the configuration of the present embodiment will be described with reference to FIG.
FIG. 9 is a view showing a part of a ball screw that is an example of the present embodiment.
As shown in FIG. 9, the configuration of this embodiment is the same as that of the first embodiment described above except for the configuration of the nut 4.
The nut 4 includes a lubricant supply body 16, a storage member 18, a lubricant supply body attaching / detaching means 20, a nut-side cap 22, and a dustproof member 48 on both end surfaces thereof. That is, the nut 4 of this embodiment is provided with a dustproof member 48 in addition to the first embodiment described above.

The dust-proof member 48 is formed of, for example, a non-contact seal member such as a labyrinth seal, is attached to the inner peripheral side of the nut-side cap 22, and is disposed between the nut-side cap 22 and the screw shaft 2. Therefore, the structure is configured to suppress the entry of foreign matter into the load rolling path 10.
A dust-proof member mounting groove 52 is formed on the outer peripheral surface of the dust-proof member 48 and matches the cap-side dust-proof member mounting hole 50 formed in the nut-side cap 22 when viewed from the radial direction of the screw shaft 2. The cap-side dustproof member mounting hole 50 penetrates a part of the nut-side cap 22 arranged inside the nut 4 in the radial direction of the screw shaft 2.

When attaching the dustproof member 48 to the inner peripheral side of the nut side cap 22, the nut side dustproof member mounting hole 36, the cap side dustproof member mounting hole 50, and the dustproof member mounting groove 52 are viewed from the radial direction of the screw shaft 2. In this state, cap fixing screws (not shown) are inserted into these holes, and their tips are disposed in the dustproof member mounting grooves 52.
Other configurations are the same as those of the first embodiment described above.

Next, with reference to FIG. 9, an effect | action, effect, etc. of the rolling screw apparatus 1 provided with said structure are demonstrated. In the following description, the configuration other than the nut 4 is the same as that of the first embodiment described above, and therefore, different parts will be mainly described.
When the nut 4 and the screw shaft 2 rotate relative to each other during the operation of the rolling screw device 1, a portion of the screw shaft 2 outside the end surface of the nut 4 moves to the inside of the nut 4.

At this time, foreign matter enters the load rolling path 10 on the inner peripheral surface of the nut-side cap 22 attached to the end surface of the nut 4, between the nut-side cap 22 and the screw shaft 2. A dustproof member 48 that suppresses the above is attached.
For this reason, since the foreign material which infiltrated into the load rolling path 10 at the time of the operation of the rolling screw apparatus 1 is suppressed from entering between the load rolling path 10 and the rolling elements 12, the rolling screw apparatus 1 It is possible to prevent the operability from decreasing.

Further, since the dust-proof member 48 is attached to the inner peripheral surface of the nut-side cap 22, the lubricant supply can be performed without removing the dust-proof member 48 from the nut-side cap 22 when the lubricant supplier 16 is replaced. The body 16 can be exchanged.
Therefore, in the rolling screw device according to the present embodiment, the dust-proof member 48 that suppresses the entry of foreign matter into the load rolling path 10 is attached to the inner peripheral side of the nut-side cap 22, thereby It arrange | positions between the screw shafts 2.

For this reason, since the foreign material which infiltrated into the load rolling path 10 at the time of the operation of the rolling screw apparatus 1 is suppressed from entering between the load rolling path 10 and the rolling elements 12, the rolling screw apparatus 1 It becomes possible to prevent the operability from being lowered, and the operability of the rolling screw device 1 can be improved.
Further, in the rolling screw device of the present embodiment, the dustproof member 48 is attached to the inner peripheral surface of the nut side cap 22, and the dustproof member 48 is attached to the nut side cap when the lubricant supply body 16 is replaced. It is possible to replace the lubricant supply body 16 without removing it from 22.

For this reason, after the installation state of the dust-proof member 48 is set when the rolling screw device 1 is assembled, the positional relationship between the dust-proof member 48 and the screw shaft 2 changes even if the lubricant supply body 16 is replaced. This can be prevented.
Other actions and effects are the same as those of the first embodiment described above.
In the rolling screw device 1 of the present embodiment, the dust-proof member 48 is attached to the inner peripheral side of the nut-side cap 22 and disposed between the nut-side cap 22 and the screw shaft 2. However, the present invention is limited to this. It is not a thing. That is, for example, the dust-proof member 48 is arranged between the nut-side cap 22 and the screw shaft 2 by arranging the dust-proof member 48 between the surface of the nut-side cap 22 on the lubricant supply body 16 side and the lubricant supply body 16. May be.

It is a figure which fractures | ruptures and shows a part of ball screw which is an example of 1st embodiment of this invention. It is the perspective view which looked at the lubricant supply body from the axial direction of the screw shaft. It is the perspective view which looked at the accommodating member from the axial direction of the screw shaft. It is the perspective view which looked at the end surface of the nut shown in FIG. 1 from the axial direction of the screw shaft. It is a figure which shows the procedure of the operation | work which removes a lubricant supply body from a nut, and is a figure which shows the operation | work which removes a to-be-latched part from the inside of a latching part. It is a figure which shows the procedure of the operation | work which removes a lubricant supply body from a nut, and is a figure which shows the state which spaced apart the accommodating member and the lubricant supply body from the end surface of a nut. It is a figure which shows the procedure of the operation | work which removes a lubricant supply body from a nut, and is a figure which shows the state which moves only a lubricant supply body toward the end surface side of a nut in the state which fixed the accommodating member. It is a figure which shows the procedure of the operation | work which removes a lubricant supply body from a nut, and is a figure which shows the state which took out the garter spring from the inside of a concave groove. It is a figure which shows the procedure of the operation | work which removes a lubricant supply body from a nut, and is a figure which shows the state which removed the supply body structural member from the outer peripheral side of the screw shaft. It is a figure which fractures | ruptures and shows a part of ball screw which is an example of 2nd embodiment of this invention. It is the perspective view which looked at the end surface of the nut which is an example of 3rd embodiment of this invention from the axial direction of the screw shaft. It is the perspective view which looked at the end surface of the nut which is an example of 4th embodiment of this invention from the axial direction of the screw shaft. It is a figure which fractures | ruptures and shows a part of ball screw which is an example of 5th embodiment of this invention. It is a figure which shows the general structural example of a linear motion apparatus, (a) is the top view of a linear motion apparatus, (b) is the figure which looked at (a) from the axial direction of the screw shaft. It is the sectional view on the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling screw apparatus 2 Screw shaft 4 Nut 6 Screw shaft side rolling groove 8 Nut side rolling groove 10 Load rolling path 12 Rolling body 14 Return tube 16 Lubricant supply body 18 Housing member 20 Lubricant supply body attaching / detaching means 22 Nut side Cap 24 Concave groove 26 Garter spring 28 Rotation-suppressing recess 30 Housing member-side rotation-suppressing convex portion 32 Hook-up portion 34 Hook-up portion 36 Nut-side dustproof member mounting hole 38 Relative displacement restricting means 40 Access allowance portion 42 Deviation prevention portion 44 Nut-side rotation suppression convex portion 46 Deviation suppression portion 48 Dust-proof member 50 Cap-side dust-proof member mounting hole 52 Dust-proof member mounting groove 54 Linear motion device 56 Linear guide 58 Bracket 60 Guide rail 62 Slider 64 Through hole 66 Mounting screw

Claims (9)

A nut arranged on the outer peripheral side of a screw shaft having a spiral screw shaft side rolling groove on the outer peripheral surface and having a spiral nut side rolling groove facing the screw shaft side rolling groove on the inner peripheral surface. There,
Lubricant supply body that contains a lubricant and supplies the contained lubricant to the outer peripheral surface of the screw shaft, and a lubricant supply body attaching / detaching means for detachably attaching the lubricant supply body to the end side of the nut And comprising
The lubricant supply body attaching / detaching means includes a plurality of hooking portions extending along an end surface of the nut, and a plurality of hooking portions hooked on the plurality of hooking portions,
One of the hook part and the hook part is provided on the end side of the nut, and the other of the hook part and the hook part is provided on the lubricant supply body,
The hooked portion is hooked to the hooking portion by relative displacement in a predetermined hooking direction along an end surface of the nut with respect to the hooking portion,
The hooking portion protrudes in a direction along the axial direction of the screw shaft, extends in an arc shape along the circumferential direction of the screw shaft, and is hooked on the hooking portion. of, we have a relative displacement restricting means for restricting the relative displacement of the said latching direction with respect to the engaging portion,
By rotating the latched portion relative to the latching portion in the circumferential direction of the screw shaft, the latched portion is latched with the latched portion, or the latched portion is hooked from within the latched portion. Remove the stop
When the screw shaft moves from the inside of the nut toward the lubricant supply body side, the lubricant supply body rotates in the same direction as the rotation direction of the screw shaft when viewed from the axial direction of the screw shaft. When the latching portion is latched to the latching portion and the lubricant supply body rotates in a direction opposite to the rotation direction of the screw shaft as viewed from the axial direction of the screw shaft, the latched portion is moved to the latching portion. A nut characterized by being removed from the nut. A nut-side cap attached to the end face of the nut;
The latching portion is provided on the nut-side cap,
Wherein the hook portion has a nut as claimed in claim 1, characterized in that provided in the lubricant supply member. A nut-side cap attached to the end face of the nut;
The lubricant supply body includes a housing member that houses the lubricant supply body therein,
The latching portion is provided on the nut-side cap,
Wherein the hook portion has a nut as claimed in claim 1, characterized in that provided in the housing member. 4. The nut according to claim 3 , wherein the housing member is formed of a light-transmitting material that allows the lubricant supply body housed therein to be visually recognized from the outside. A rotation-suppressing recess formed in the lubricant supply body, and an accommodating-member-side rotation-suppressing projection that is formed in the housing member and fits with the rotation-suppressing recess.
The accommodating member-side rotation suppression recess includes a first rotation suppression recess that is continuous with a surface facing the end surface of the nut of the lubricant supply body and an outer peripheral surface of the lubricant supply body, and the lubricant supply body. nut according to claim 3 or 4, characterized in that and a second rotation inhibiting recess contiguous an outer peripheral surface opposite to the surface and lubricant supply member and an end face opposite to the face of the nut. A rotation suppression concave portion formed in the lubricant supply body, and a nut side rotation suppression convex portion formed in the nut side cap and fitted to the rotation suppression concave portion. Item 6. The nut according to any one of Items 2 to 5 . On the surface of the nut-side cap that faces the lubricant supply body, an elastic force projects to the lubricant supply body side to suppress deviation of the hooked portion that is hooked on the hooking portion from the hooking portion. Form a deviating suppression part,
The deviation restraining portion is elastically deformed by a pressing force from the lubricant supply side toward the end surface of the nut, and the deviation of the latched portion latched by the latching portion from the latching portion. The nut according to any one of claims 2 to 6 , wherein the nut is allowed. A dust-proof member is disposed between the nut-side cap and the screw shaft to prevent foreign matter from entering the load rolling path including the screw shaft-side rolling groove and the nut-side rolling groove. The nut according to any one of claims 2 to 7 . A rolling screw device comprising the nut according to any one of claims 1 to 8 .

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