Nsk Corporation

Nsk Precision Co., Ltd.

Ryoichi Sato

Hiroki Yamaguchi

Shinichi Kasuga

Soichiro Kato

Yoshinori Mizumura

Shiroji Yabe

Nobumitsu Takahashi

Nobuaki Fujimura

Kenji Kano

Jun Matsumoto

Yasuyuki Yamazaki

Masaru Hattori

Shizuo Kashiwagi

Kenta Nakano

A linear guide apparatus maintaining a high dust-proof performance over an extended period of time and includes side seal units attached to end parts of a slider in the axial direction. Each side seal unit is provided with: a first seal member, at the slider, arranged in the axial direction of the slider; a second seal member at the outside of the slider in the axial direction; and a lubricating member held between the first and second seal members. The first seal member has first lip parts sliding against the rolling element rolling grooves of the guide rail, while the second seal member has second lip parts sliding against the rolling element rolling grooves. The lubricating member has a first oil-containing member for supplying lubricant to the rolling element rolling grooves. The first and second lip parts are arranged not to come into contact with the first oil-containing member.

Linear guide apparatus

In a linear motion guide device suitably applicable to applications under high-temperature and vacuum environments where no plastic end cap is applicable, and having an end cap formed by injection molding using metal powders as a raw material, the degree of adhesion of the metal powders is improved at a thin and keen portion like the scooping portion of the end cap, thereby suppressing an abrasion and a deformation. The end cap () is formed by injection molding (MIM: Metal Injection Molding) using metal powders of equal to or less than 20 &#x3bc;m as a raw material, and has a scooping portion () having undergone an HIP (Hot-Isostatic-Pressing) process and a thermal process.

Linear motion guide device

A linear guiding device where noise characteristics are improved by reducing traveling noise and operability of a slider body is smoothed, and where movement braking can be improved by reducing rolling body passage vibration. Crowningwith a curved surface having a predetermined curvature radius R is provided on an end section of a rolling body raceway grooveof a bearing block. A crowning amount C of the crowningis set to a value C&#x3e;Hgreater that the value of a maximum elastic deformation amount Hof a rolling body B elastically deformed in a rolling body rolling pathby a preload or an external load. By this, even when a large load acts on a bearing blockA or a large installation error occurs by skewing etc., the rolling body B smoothly rolls without an elastic deformation amount of the rolling body B rolling on the end section side of the rolling body raceway groovebecoming greater than the crowning amount C. As a consequence, significant worsening of a noise level and impairment of operability can be prevented.

Linear motion guiding apparatus

In a linear guide bearing apparatus wherein a separator is interposed between adjacent balls K and K moving following a curved circulating path, and the ball K contacts concave faces W of the separator Tat both ends in an axial line direction and at the same time the ball K rolls as contacting a guide faceof an outside guiding memberand a guide faceof an inside guiding member, the separator has an outer diameter larger than a maximum outer diameter L&#xd8; under a condition where the ball rolls as simultaneously contacting both curved facesof the inside and the outside of the curved circulating path, and the radius of curvature of the guiding facein the curved circulating pathis reduced to a size not contacting the separator T.

Linear guide bearing apparatus

In a linear guide bearing apparatus wherein a separator is interposed between adjacent balls K and K moving following a curved circulating path, and the ball K contacts concave faces W of the separator T at both ends in an axial line direction and at the same time the ball K rolls as contacting a guide faceof an outside guiding memberand a guide faceof an inside guiding member, the separator has an outer diameter larger than a maximum outer diameter L&#x3c6; under a condition where the ball rolls as simultaneously contacting both curved facesof the inside and the outside of the curved circulating path, and the radius of curvature of the guiding facein the curved circulating pathis reduced to a size not contacting the separator T.

Disclosed is a linear guide device in which a rate of change expressed as 'Dmax&#x2212;Dmin', becomes extremely small where Dmax and Dmin are respectively a local maximum and a local minimum of D, expressed as (dxdx)/dx, which is produced when a steel ball B moves a distance corresponding to a rolling element-to-rolling element span, dxis a minute movement quantity of a steel ball B when it moves from one space defined between rolling element rolling groovesandof an element endless circulating racewayto one of curved element circulating R partsand dxis a minute movement quantity of another steel ball B when it moves from the other curved element circulating R partto the space while the former steel ball is moved by the minute movement quantity dx

Linear guide device

In a retaining piece interposed between the adjacent rolling balls, a concave surface of each of both side surfaces of the retaining piece where it contacts with the spherical surfaces of the balls is configured to partly contact with the spherical surface of the ball. The concave surface includes a linear contact portion to be in contact with the ball and an approximate curved surface having the radius of curvature approximate to that of the ball, which is located on the inner side of the linear contact portion. In addition, recesses which are joined to the gate portion and the ejector pin in a molding process are formed in the concave surfaces. A recess is formed at the joining portion or near a parting line. Fins formed in the molding process are capable to be put into the recess.

Retaining piece structure

To provide a dustproof device for a linear guide rail capable of protecting bolt holes in the linear guide rail from foreign matters such as cutting dust or the like without many tap holes formed in an end face of the linear guide rail. A tension applying means for applying a tension to a band-like cover body includes a tension applying block arranged at an end of a linear guide rail a plurality of pressing plates for pressing the band-like cover body on an upper face of the tension applying block and a pressing plate fixing bolt for fixing the pressing plates on the tension applying block A pair of right and left arm portions each having an engagement convex portion engaging with a rolling element rolling groove in the linear guide rail are provided on the tension applying block

Dustproof device for linear guide rail

In the present linear guide bearing, the center of curvature O&prime; of a ball reversing passage is shifted to a return side ball passage side by a given amount m when compared with the center of curvature O&prime; of a conventional guide bearing. Due to this, not only the radius of curvature of a concave-arc-shaped groove formed in each end cap is reduced by a given amount m but also the concave-arc-shaped groove is shifted to the return side ball passage side by a given amount m, when compared with the conventional guide bearing. Thus, an angle &agr; formed between a line connecting the leading end of a tongue portion to the center of curvature O&prime; of a ball reversing passage and the moving-direction end face of a bearing main body can be reduced significantly when compared with the conventional bearing.

Linear guide bearing

In a linear guide bearing apparatus wherein a separator is interposed between adjacent balls K and K moving following a curved circulating path , and the ball K contacts concave faces W of the separator T at both ends in an axial line direction and at the same time the ball K rolls as contacting a guide face of an outside guiding member and a guide face of an inside guiding member , the separator has an outer diameter larger than a maximum outer diameter L&phgr; under a condition where the ball rolls as simultaneously contacting both curved faces of the inside and the outside of the curved circulating path , and the radius of curvature of the guiding face in the curved circulating path is reduced to a size not contacting the separator T.

A linear guide device in which a rate of change expressed as &ldquo;Dmax&minus;Dmin&rdquo;, becomes extremely small where Dmax and Dmin are respectively a local maximum and a local minimum of D, expressed as (dx2&minus;dx1)/dx, which is produced when a steel ball B moves a distance corresponding to a rolling element-to-rolling element span, dx1 is a minute movement quantity of a steel ball B when it moves from one space defined between rolling element rolling grooves and of an element endless circulating raceway to one of curved element circulating R parts and dx2 is a minute movement quantity of another steel ball B when it moves from the other curved element circulating R part to the space while the former steel ball is moved by the minute movement quantity dx1.

Growing community of inventors

Gunma, Japan

Ryoichi Sato