JP2001208057A - Rolling guide unit for finite motion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling guide unit for a finite motion which can realize a maintenance free concerning a lubricating oil delivery for a long period of time providing a solid lubricant on a roller assembly which is mounted between the track groove arranged at a pair of track tables. SOLUTION: The cylindrical roller assembly 3 arranged between the first track table 1 and the second track table 2 contains a roller 8 and a plurality of rollers 9 sustained with free rotation by the retainer 8 which is covered with a solid lubricant 31 and it is characterized that a part of the cylindrical surface 9a of the rollers 9 is protruded from an aperture 32 of the solid lubricant 31 and the track surfaces 5a, 7b are lubricated by the lubricant which exudates from the solid lubricant 31 progressively when the rollers 9 runs the track surface 5a, 7b with rotation. Furthermore, the roller assembly 3 forms approximate cross shaped section blocking the gaps 14 to oppose to the both track tables 1, 2 and to be the seals to prevent the entry of the foreign particles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding member for holding a rolling element and a rolling element rotatably, such as a fixed body and a movable body, between a pair of rails that move relative to each other within a predetermined finite range. TECHNICAL FIELD The present invention relates to a rolling guide unit for finite motion that rolls and guides a way through a rolling element assembly including a rolling element.

[0002]

2. Description of the Related Art Conventionally, a pair of rails, such as a fixed body (bed) and a movable body (table), move relative to each other over a predetermined distance range. A groove (track surface) is formed, and a rolling element rotatably held by a retainer is disposed between the track grooves, and the rolling element rolls and guides the track groove, so that relative movement of the pair of track bases is controlled. A rolling guide unit for finite motion has been proposed. FIG. 9 shows an example of a rolling guide unit for finite motion having a pair of rails and a rolling element held by a retainer.

FIG. 9 is a perspective view showing a part of an example of a conventional rolling guide unit for finite motion. The rolling guide unit U for finite motion shown in FIG. 9 includes two raceway members, a first raceway 1, a second raceway 2, and a cylindrical roller assembly 40 in which cylindrical rollers are incorporated in a retainer. ing.
An upper raceway surface 5 is provided on the longitudinal side wall surface 4 of the first raceway 1.
a, a substantially V-shaped track groove 5 in which a lower track surface 5b and a grinding relief groove 5c are formed. A substantially V-shaped raceway groove 7 in which an upper raceway surface 7a, a lower raceway surface 7b and a grinding relief groove 7c are formed is formed on the longitudinal side wall surface 6 of the second raceway 2. That is, in the track grooves 5 and 7,
Upper track surfaces 5a, 7a facing obliquely downward above the longitudinal side wall surfaces 4, 6 and lower track surfaces 5b, 7b facing obliquely upward below the longitudinal side wall surfaces 4, 6 are formed. The grinding relief grooves 5c, 7c are
It is formed in the depth direction of the longitudinal side walls 4, 6 between the lower raceway surface 7b and the lower raceway surfaces 5b, 7b.

Between the longitudinal side wall surface 4 of the first way 1 and the longitudinal side wall surface 6 of the second way 2, a plurality of cylindrical rollers 9 are mounted on a plate-like cage 8 as a rolling element assembly. Is rotatably held by a cylindrical roller assembly 40.
A track path R between the track grooves 5 and 7 of the first track 1 and the second track 2, that is, an upper track surface 5 a and a lower track surface 7 b opposed to the upper track surface 5 a are formed. Orbital path, lower raceway surface 5b, and upper raceway surface 7a facing lower raceway surface 5b
The cylindrical roller 9 can roll on the orbital path formed by. Further, screw holes 16 are formed in both end surfaces 15 in the longitudinal direction of the first way 1 and the second way 2, and end screws 17 screwed into the screw holes 16 are connected to the first way 1. When the second way 2 moves relative to each other, the retainer 8 moves between the first way 1 and the second way.
Departure from the raceway grooves 5, 7 of the raceway 2 is prevented. The second way 2 of FIG. 9 is shown with the end screw 17 removed from the screw hole 16. 1st way 1 and 2nd
Each of the rails 2 is formed with a screw hole 18 into which a fixing bolt for fixing to a relatively moving device is screwed. One side of the screw hole 18 is formed in an enlarged hole 19 for receiving a bolt head of a fixing bolt. The adjacent cylindrical rollers 9, 9 are arranged in a state where the rotation axes intersect.

The cylindrical roller assembly 40 used in the rolling guide unit U for finite motion is shown in FIGS.
It is shown in FIG. FIG. 10 is a front view showing the cylindrical roller assembly 40, and FIG. 11 is a cylindrical roller assembly 4 shown in FIG.
0 is a side view. In the cylindrical roller assembly 40 shown in FIGS. 10 and 11, the retainer 8 is made of an elastic thin plate material such as a plastic or a metal material, and the retainer 8 is fitted with a plurality of cylindrical rollers 9. Are formed at regular intervals. The cylindrical roller 9 is locked by the locking claw 11 formed by cutting and raising the end face 13 at the upper and lower edges of the holding hole 10, so that the cylindrical roller 9 is brought into contact with the locking claw 11 and the holding hole It is held at 10. In FIG. 10, reference numerals for the cylindrical rollers 9 are shown only for both ends and a part near the center. As shown in FIG. 11, the cylindrical rollers 9 are arranged obliquely in the holding holes 10 of the retainer 8, and the adjacent cylindrical rollers 9, 9
Corresponds to the direction in which the rotation axes 12 alternately intersect.
The cross roller is fitted and held in the cross roller.

In the examples shown in FIGS. 9 to 11, the rolling guide unit U for finite motion using the cylindrical rollers 9 as the rolling elements is shown. However, the present invention is not limited to this, and needle rollers may be used as the rolling elements. Good. FIGS. 12 and 13 show an example of a needle roller assembly in which needle rollers are incorporated in a retainer as rolling element assemblies.
Is shown in FIG. 12 is a front view showing an example of the needle roller assembly, and FIG. 13 is a side view of the needle roller assembly shown in FIG. As shown in FIGS. 12 and 13, the needle roller assembly 43 has holding holes 30 formed at equal intervals in the holder 28.
The needle roller 29 is rotatably held at the same time. The retainer 28 is formed so as to be able to retain a plate-like member such as a steel plate by bending the plate-like member into an M-shaped cross section.

As an example of a rolling bearing for finite linear motion capable of reliably controlling the movement of a track member, there is one disclosed in Japanese Patent Application Laid-Open No. 7-91445. In this rolling bearing for finite linear motion, the raceway grooves formed in the raceway member are arranged to face each other, the rack is arranged in a grinding relief groove formed in the raceway groove, and the raceway groove is formed between the raceway grooves. A cage incorporating a cylindrical roller rolling on an orbital path and a pinion meshing with a rack is mounted. When the track member relatively moves, the pinion and the rack move while engaging with each other, so that the track member can reliably control the relative movement without slipping with the retainer.

The present applicant has already described a planar roller bearing for a finite linear motion in which rollers are arranged in parallel with each other so that two opposing planes are used as raceway surfaces and are orthogonal to the longitudinal direction between the raceway surfaces. A cage having a plurality of pockets formed in parallel in the longitudinal direction of the plate-like member and having a substantially rectangular shape, and rollers fitted in the pockets of the cage, and both ends of the cage in the longitudinal direction thereof. By fixing the sliding jib with a thickness slightly smaller than the diameter of the roller, which protrudes from the upper and lower surfaces of the cage, to the two or more pockets, the cage does not contact the raceway surface,
A flat roller bearing has been proposed in which rollers are guided at the center thereof to minimize roller skew.
No. 41772).

Further, the present applicant has already developed a precision slide device for reciprocating a slider at a high speed in a tool rest device for lead machining or the like by using a V-shaped groove of a fixed-side track and a V-shaped groove of a floating-side track. In the meantime, the slider is slidably supported via a bearing having a roller, and the track surface of the slider is configured to be inclined by a predetermined angle with respect to the required straight traveling accuracy direction, absorbing mounting errors, and Japanese Patent Laid-Open Publication No. 5-253775 proposes a precision slide device that increases support rigidity, improves damping of vibration generated during reciprocating motion, and obtains high running accuracy.

No burrs are generated, no need for post-processing,
As a method of manufacturing a rolling bearing filled with a solid lubricant that can be filled at a low pressure, there is a technique disclosed in Japanese Patent Application Laid-Open No. 9-94893. A lubricating grease or lubricating oil and thermoplastic resin powder mixed and dispersed at room temperature are injected into the gap between the inner ring and outer ring of the rolling bearing at room temperature, and a mold consisting of a lower mold and an upper mold that fits into this gap is removed. Heat to the sintering temperature of the thermoplastic resin powder, fit into this gap, solidify the mold contact surface of the lubricant, remove the mold and set the rolling bearing to the gel point of the thermoplastic resin and below the drop point And then cooled to solidify the entire lubricant and produce a rolling bearing filled with a solid lubricant. The solid lubricant is filled into a rotating bearing and solidified for each bearing unit.

[0011]

The rolling guide unit for finite motion described above has a simple structure, can perform high-precision machining on the raceway surface of the raceway groove, and has a super-precision whose length is strictly controlled. Since the rolling elements made of cylindrical rollers and needle rollers are incorporated in the cage, extremely smooth linear motion with small frictional resistance can be obtained. Therefore, precision measuring instruments,
It is widely used for equipment such as precision processing machines. However, in the rolling guide unit for finite motion, stopping the device for refueling reduces the operation rate of the device and increases maintenance costs. Freeness is strongly demanded, and it is desired to lubricate the lubricant with a solid lubricant that can be lubricated for a long period of time. Regarding the rolling element assembly interposed between the track grooves arranged opposite to each other in a pair of way, lubrication is applied to the track path on which the rolling elements roll over a long period of time without supplying oil from outside. There are issues to be solved in terms of self-fuelling.

[0012]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and comprises a retainer and a plurality of rolling elements rotatably held by the retainer. By providing a solid lubricant on the rolling element assembly interposed between the raceways arranged opposite to the way, it is possible to lubricate without stopping the operation of the equipment, and it is necessary to refuel for a long time. The object of the present invention is to provide a rolling guide unit for finite motion that can realize maintenance-free operation.

According to the present invention, there is provided a pair of rails having a track path formed between opposed longitudinal wall surfaces, and the track is disposed between the longitudinal wall surfaces of the two rail stands for relatively moving the both rail tracks. A rolling element assembly comprising a rolling element capable of rolling on a road and a plate-shaped retainer having a holding hole for rotatably holding the rolling element, wherein the rolling element assembly includes:
The present invention relates to a rolling guide unit for finite motion, wherein the rolling element is covered with a solid lubricant so that a part of the surface of the rolling element is exposed so as to roll on the track.

As described above, the rolling guide unit for finite motion constituted by the pair of way and the rolling element assembly is arranged such that the rolling element assembly is brought into a state in which a part of the surface of the rolling element is exposed by the solid lubricant. Since the rolling elements rotate on the track while rotating, the rolling elements move relative to the two tracks when the rolling elements move relative to each other by the rolling elements. At the same time, the rolling element contacts the raceway while rotating, so that the lubricant oozes out from the solid lubricant to the rolling element and the raceway to lubricate the rolling element and the raceway for a long time. Since the supply of the lubricant from the solid lubricant is continued until the solid lubricant is substantially consumed, the rolling elements and the raceway are lubricated for a long time.

[0015] The track path comprises opposing track surfaces formed on the longitudinal wall surface of each of the track bases, the retainer is formed of a flat plate, and the rolling elements are axial centers of the adjacent rolling elements. Are cylindrical rollers arranged so as to intersect alternately. The raceway is constituted by a raceway surface formed so as to face the wall in the longitudinal direction, and the rolling elements can be so-called cross rollers arranged so that their axes intersect alternately. At this time, the raceway surface is an upper raceway surface formed obliquely downward above the longitudinal wall surface, and a lower raceway surface formed obliquely upward below the longitudinal wall surface. It is formed in a V-shaped cross section composed of a raceway surface. Since the cross roller is guided on the raceway surface formed obliquely with respect to the longitudinal wall surface, the raceway is guided straight and accurately without traversing the track path. In order to improve the grinding of the upper raceway surface and the lower raceway surface, a grinding relief groove is formed on the longitudinal wall surface between the upper raceway surface and the lower raceway surface.

[0016] The track path comprises opposing track surfaces formed on the longitudinal wall surfaces of the respective track bases, the retainer comprises a plate material formed into an M-shaped cross section, and the rolling elements are parallel to each other. The needle rollers are arranged.

The solid lubricant is formed in a shape to close a gap formed by the raceway surface of the raceway. With such a configuration, the rolling element assembly closes a gap at a portion where the rolling element rolls on the track path, and also serves as a seal for preventing foreign substances from entering dirt and the like and a certain amount of moisture.

A stopper for preventing the rolling element assembly from jumping out is provided at an end of the track base. When the rolling elements roll on the track, the rolling element assemblies also move relative to the two ways, so that the rolling element assemblies do not protrude from the ends of the way when the two ways are relatively moved. A stopper is provided at the end of the way as described above. Considering the length of the way and the length of the rolling element assembly, the relative amount of movement of the way is considered as the rolling element assembly when the relative amount of movement of the way exceeds the moving limit. Abuts against the stop to prevent further relative movement of the way and further protrusion of the rolling element assembly.

The solid lubricant is formed by heating ultra-high molecular weight polyethylene powder mixed with lubricating oil to solidify it. The rolling element assembly is immersed in the flowing solid lubricant in a state where the intermediate assembly including the rolling element and the retainer that rotatably holds the rolling element is held between jigs, It is manufactured by heating and solidifying the solid lubricant attached to the rolling elements and the retainer of the intermediate assembly. Further, the rolling element assembly may be configured such that the plurality of intermediate assemblies are sandwiched in parallel between a pair of jigs or alternately stacked with the jigs, and the solid lubrication in a flowing state is performed. It is immersed in an agent and is manufactured in multiple pieces.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a rolling guide unit for finite motion according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a part of an embodiment of a rolling guide unit for finite motion according to the present invention. FIG. 2 is a cylindrical roller assembly which is a rolling element assembly used in the rolling guide unit for finite motion shown in FIG. And FIG. 3 is a cross-sectional view of the cylindrical roller assembly shown in FIG.
In each of FIGS. 1 to 3, parts or parts having the same functions as those of the parts and parts constituting the conventional finite motion rolling guide unit shown in FIGS. By assigning the same reference numerals, a detailed description will be omitted.

A rolling guide unit U1 for finite motion according to the present invention shown in FIG. 1 is a first track (fixed body) which linearly moves (moves linearly) relative to each other within a predetermined range extending in the longitudinal direction X. A first and second way (movable body) 2 and a cylindrical roller assembly 3 as a rolling element assembly having a predetermined length disposed between the two ways 1 and 2 and rollingly guiding the two ways. Consists of The first and second ways 1 and 2 have the same structure as each way of the rolling guide unit for finite motion U shown in FIG. 9, and have the same structure as the cage 8 of the cylindrical roller assembly 3. The cylindrical roller 9 as a moving body also has the same arrangement and structure as the retainer 8 and the cylindrical roller 9 of the conventional cylindrical roller assembly 40. The longitudinal side wall surfaces 4 and 6 constitute a longitudinal wall surface of the rolling guide unit for finite motion of the present invention.

The rolling element assembly 3 including the cage 8 and the plurality of rolling elements 9 rotatably held by the cage 8 is covered with a solid lubricant 31. Since the solid lubricant 31 of the cylindrical roller assembly 3 has the lateral protrusion 35 extending toward the grinding relief grooves 5c and 7c, the cross section of the cylindrical roller assembly 3 is increased by the solid lubricant 31 covering the outside. As a whole,
It is formed in a substantially cross shape. The cylindrical roller assembly 3 covered with the solid lubricant 31 is formed in a shape that closes the gap 14 (see FIG. 3) between the first and second ways 1 and 2. In addition, the seal serves as a seal for preventing foreign substances such as dust and the like from entering the gap 14 and a certain amount of moisture.

The solid lubricant 31 covers substantially the entire cage 8, but the cylindrical rollers 9 form the raceway surface 5 forming the raceway R.
In order to enable rolling on a, 5b, 7a, and 7b, the solid lubricant 31 is such that a part of the cylindrical surface 9a, which is the surface of the cylindrical roller 9, projects from the solid lubricant 31 from the beginning. In addition, the cylindrical roller 9 is covered with the opening 32 formed. That is, the cylindrical roller 9 is provided with the solid lubricant 31 in the cage 8.
The solid lubricant 31
A portion 9a of the cylindrical surface of the cylindrical roller 9 slightly appears from the surface of the cylindrical roller 9 and the emerging cylindrical surface 9a is the raceway surface 5a, 5b, 7a,
Roll 7b. At this time, since the lubricant is supplied to the surface of the cylindrical roller 9 by oozing out of the solid lubricant 31 one after another, the cylindrical roller 9 rolls on the raceway surfaces 5a, 5b, 7a, 7b, and thereby the raceway surfaces 5a, 5b. , 7a, 7b can be lubricated for a long period of time.

In the embodiment shown in FIG. 1, the stopper 17 provided at the end 15 of the second way 2 is omitted from illustration, but when the rolling guide unit U1 for finite motion is used, the stopper 17 is not used. The cylindrical roller assembly 3 is screwed into screw holes 16 formed at a total of four end portions 15 of the first and second way 1. The cylindrical roller assembly 3 has upper and lower peripheral surfaces 33 and side peripheral surfaces. It is preferable to prevent the surfaces other than 34 from being exposed to the outside.

FIGS. 4 to 6 show another embodiment of the rolling guide unit for finite motion according to the present invention. FIG. 4 is a side view showing another embodiment of the rolling guide unit for finite motion according to the present invention, and FIG. 5 is a needle roller assembly which is a rolling element assembly used in the rolling guide unit for finite motion shown in FIG. FIG. 6 is a cross-sectional view of the needle roller assembly shown in FIG. The embodiment shown in FIGS. 4 to 6 is directed to a needle roller assembly in which the needle roller assembly shown in FIGS. 12 and 13 is covered with a solid lubricant, and a finite motion using the needle roller assembly. It is a rolling guide unit. Rolling guide unit U2 for finite motion shown in FIG.
Has longitudinal upper and lower wall surfaces facing up and down as the longitudinal wall surfaces, like the longitudinal wall surfaces of the rolling guide unit U1 for finite motion, although the facing directions are different,
The first way 21, the second way 22, and both way 21,
A needle roller assembly 23 is provided as a rolling element assembly having needle rollers 29 capable of rolling on raceway surfaces 24 and 25 formed on both track bases 21 and 22 to relatively move 22. ing. Assuming that the length of the needle roller assembly 23 is L and the length of the second way 22 is L1 longer than the length L by S / 2, the stroke of the first way 21 is represented by S. .

The needle roller assembly 23 shown in FIGS. 5 and 6
The conventional needle roller assembly 43 used for flat rolling guide as shown in FIG. 12 and FIG.
It is configured as covered by. Needle roller assembly 2
3, a plurality of needle rollers 29 are rotatably held in a retainer 28 made of a steel plate formed into an M-shape as viewed from the end surface, similarly to the needle roller assembly 43. Solid lubricant 5
Reference numeral 1 denotes a first way 1 and a second way 2 as shown in FIG.
Is formed in a shape that closes the gap 44 facing each other, so that each needle roller 29 can roll on the raceway surfaces 24 and 25 of the first and second raceways 21 and 22.
Of the cylindrical surface, which is the rolling surface of each needle roller 29, slightly appears on the surface of the needle roller 29 from the beginning.
A slit-shaped opening 52 extending in the axial direction is formed. The lubricant is leached one after another from the solid lubricant 51 onto the surface of the needle rollers 29, and the needle rollers 29 are
Rolling the bearing surfaces 4, 25 lubricates the raceway surfaces 24, 25 for a long period of time.

In each of the embodiments described above, the first and second ways are shown as being relatively linear.
The first way and the second way may be curved. In each of the above embodiments, the rolling element is a cylindrical roller,
Although the rollers are like needle rollers, the rolling elements may be balls. Further, in each of the embodiments described above, the linear motion guide is used, but the linear motion guide may be used. In this case, both the way and the rolling element assembly are formed in an arc shape as a whole. In addition, it goes without saying that appropriate changes can be made in the shape, structure, composition, and the like of each part or part.

The rolling element assembly used in the present invention can be manufactured from a multi-cavity mold as shown in FIGS. First, materials for producing the solid lubricants 31 and 51 are powdered resin as ultra high molecular weight polyethylene powder (for example, Miperon (registered trademark) XM-220 manufactured by Mitsui Petrochemical Co., Ltd.) and FBK as lubricating oil. Oil (turbine oil) (RO # 100) is prepared.

As shown in FIG. 7A, a plurality of cylindrical roller assemblies 40 of the related art (FIGS. 9 to 11) are interposed and sandwiched between two jigs 60 as an intermediate assembly.
[Step 1] Fixing with fixing means such as bolts 61 and nuts 62 (FIG. 7 (a) shows only one intermediate assembly for simplicity, but in the case shown, three intermediate assemblies are used between jigs 60, 60). May be taken in large numbers). Next, the powdery resin and the turbine oil as a lubricating oil were mixed at a weight ratio of 30:70, and the liquid mixture 64 obtained by mixing was mixed in a container 6.
3 [Step 2]. Both jigs 60 and 6 in [Step 1]
The intermediate assembly (cylindrical roller assembly 40) sandwiched between 0 is put into the container 63 as it is [Step 3, FIG. 7 (b)]. The liquid mixture 64 covers the outside of the intermediate assembly sandwiched between the jigs 60 and 60 and enters the internal gap. The entire jig is placed in an airtight box, the internal pressure is reduced, and the bubbles inside the box are expanded to float on the liquid surface and defoam [Step 4].
Put the entire jig in a furnace and heat it at 150 ° C for 10 minutes or more.
The mixture is solidified [Step 5]. After taking out from the furnace and releasing heat, the intermediate assembly covered with the solid lubricant is taken out (FIG. 7 (c)), and unnecessary parts are cut off and finished. As shown in FIG. 2 and FIG. The embedded cylindrical roller assembly 3 is completed [Step 6].

FIG. 8 is a view for explaining the manufacture of the needle roller assembly 23 used in the rolling guide unit for finite motion for planar rolling guide shown in FIGS. Conventional FIG.
And an intermediate assembly having a structure equivalent to that of the needle roller assembly 43 shown in FIG.
5 is alternately sandwiched and immersed in a plate jig 66 as a separator / holding plate, so that the liquid mixture 64 covers the outside of the needle roller assembly 43 and enters the internal space. Subsequent processing is the same as in the case of the above-described method of manufacturing the cylindrical roller assembly 3. However, as shown in FIG. 8, the entire jig configuration is such that the intermediate assembly (the conventional needle roller assembly 43) is alternately interposed and sandwiched in the container jig 65 and fixed by the clamp 67. It has become. As the solid lubricant, in addition to the above-described materials, other materials, processing temperatures, processing methods, and the like, for example, those described in JP-A-9-94893 can be applied.

[0031]

The rolling guide unit for finite motion according to the present invention is configured as described above and has the following effects. That is, the rolling guide unit for finite motion composed of a pair of way and a rolling element assembly is configured by covering the rolling element assembly with a solid lubricant so that a part of the surface of the rolling element is exposed. Therefore, when a pair of raceways move relative to each other by the rolling element assembly and the rolling elements rotate and roll on the track path, the lubricant oozes out from the solid lubricant into the rolling elements and the track path extends for a long time. Refuel and lubricate. Since the supply of the lubricant from the solid lubricant is continued until the solid lubricant is substantially consumed, the track is lubricated for a long period of time. Therefore, according to the rolling guide unit for finite motion, in the lubrication of the track path of the track base, it is possible to realize a maintenance-free operation in which it is not necessary to supply lubricating oil from the outside for a long time without stopping the operation of the equipment. be able to. As described above, the rolling guide unit for finite motion can lubricate the raceway easily and at low cost for a long time without impairing the function of the existing rolling guide unit for finite motion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of an embodiment of a rolling guide unit for finite motion according to the present invention.

FIG. 2 is a front view showing a cylindrical roller assembly used in the rolling guide unit for finite motion of FIG. 1;

FIG. 3 is a sectional view of the cylindrical roller assembly shown in FIG.

FIG. 4 is a side view showing another embodiment of the rolling guide unit for finite motion according to the present invention.

FIG. 5 is a plan view showing a needle roller assembly used in the rolling guide unit for finite motion shown in FIG. 4;

6 is a sectional view of the needle roller assembly shown in FIG.

FIG. 7 is an explanatory view showing an example of a method of manufacturing the cylindrical roller assembly shown in FIGS. 2 and 3.

FIG. 8 is an explanatory view showing an example of a method of manufacturing the needle roller assembly shown in FIGS. 5 and 6.

FIG. 9 is a perspective view showing an example of a conventional rolling guide unit for finite motion.

FIG. 10 is a front view showing a cylindrical roller assembly used in the rolling guide unit for finite motion shown in FIG. 9;

11 is a side view of the cylindrical roller assembly shown in FIG.

FIG. 12 is a front view showing an example of a needle roller assembly used in the rolling guide unit for finite motion.

FIG. 13 is a side view of the needle roller assembly shown in FIG.

[Explanation of symbols]

 U1, U2 Rolling guide unit for finite motion 1 First track 2 Second track 3 Cylindrical roller assembly 4, 6 Longitudinal side wall (longitudinal wall) 5, 7 Track surface 5a, 7a Upper track surface 5b, 7b Lower raceway surface 5c, 7c Grinding relief groove 8 Cage 9 Cylindrical roller (rolling element) 9a Part of the surface of cylindrical roller 10 Holding hole 12 Rolling element shaft center 14, 44 Gap 15 End of track base 17 Stopper 21 1st way 22 22 2nd way 23 Needle roller assembly 28 Cage 29 Needle roller (rolling element) 29a Part of the surface of needle roller 30 Holding hole 31, 51 Solid lubricant 40, 43 Intermediate assembly (Conventional rolling element assembly) 60, 65, 66 Jig R orbital path

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3J101 AA13 AA32 AA42 CA01 FA32 FA48 3J104 AA13 AA19 AA23 AA24 AA25 AA33 AA65 AA69 AA76 AA78 BA70 CA22 DA05

Claims (10)

[Claims] 1. A pair of rails forming a track between opposing longitudinal walls, and a pair of rails disposed between the longitudinal walls of the both rails for relatively moving the rails, and the track is formed by the rails. A rolling element assembly comprising a rolling element capable of rolling and a plate-shaped retainer formed with a holding hole for rotatably holding the rolling element, wherein the rolling element assembly includes the rolling element; A rolling guide unit for finite motion, wherein a part of the surface of the rolling element is covered with a solid lubricant so as to roll on an orbital path. 2. The track path comprises opposing track surfaces formed on the longitudinal wall surface of each of the track bases, the retainer is formed from a flat plate, and the rolling elements are formed of adjacent rolling elements. The rolling guide unit for finite motion according to claim 1, comprising cylindrical rollers arranged so that their axes intersect alternately. 3. The upper raceway surface, formed on the upper side of the longitudinal wall surface and facing obliquely downward,
3. The rolling guide unit for finite motion according to claim 2, wherein the rolling guide unit has a V-shaped cross section including a lower raceway surface formed obliquely upward on a lower side of the longitudinal wall surface. . 4. The rolling guide unit for finite motion according to claim 3, wherein a grinding relief groove is formed on the longitudinal wall surface between the upper raceway surface and the lower raceway surface. 5. The track path comprises opposing track surfaces formed on the longitudinal wall surface of each of the track bases, the retainer includes a plate material formed into an M-shaped cross section, and the rolling elements are connected to each other. The rolling guide unit for finite motion according to claim 1, comprising needle rollers arranged in parallel. 6. The finite motion as claimed in claim 1, wherein the solid lubricant is formed in a shape to close a gap formed by the raceway surface of the raceway. Rolling guide unit. 7. A rolling guide unit for finite motion according to claim 1, wherein a stopper for preventing the rolling element assembly from jumping out is provided at an end of the track base. . 8. The solid lubricant according to claim 1, wherein the solid lubricant is formed by heating and solidifying ultra-high molecular weight polyethylene powder mixed with lubricating oil. Rolling guide unit for finite motion. 9. The solid lubricant in a flowing state in a state where an intermediate assembly including the rolling element and the retainer rotatably holding the rolling element is sandwiched between jigs. 9. The rolling for finite motion according to claim 8, which is manufactured by immersing the solid lubricant in the intermediate assembly and heating and solidifying the solid lubricant attached to the rolling element and the retainer of the intermediate assembly. Information unit. 10. The rolling element assembly according to claim 1, wherein the plurality of intermediate assemblies are in a flowing state in a state of being sandwiched in parallel between a pair of jigs or in a state of being alternately stacked with the jigs. 10. The rolling guide unit for finite motion according to claim 9, wherein the rolling guide unit is immersed in the solid lubricant and manufactured in multiple pieces.