JPH0743499U - Linear guide mechanism - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a linear guide mechanism including a polishing shaft and a ball bearing having a guide groove on its outer periphery, which has improved durability against fatigue fracture due to metal contact. [Structure] In a linear guide mechanism composed of a ball bearing having an outer peripheral groove for guiding the polishing shaft in a tangential direction with the polishing shaft, a φ7 shaft is adopted for the polishing shaft, and a groove cross section of the outer periphery of the ball bearing for guiding the polishing shaft. Two R4 shapes
A linear guide mechanism characterized in that two points are contacted by combining arcs.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a linear guide mechanism including a polishing shaft and a ball bearing having a guide groove on its outer periphery.

[0002]

[Prior art]

 Conventionally, there was a linear guide in which the polishing shaft was φ6 or φ8 and the V-shaped groove was adopted as the ball bearing outer peripheral groove.

[0003]

[Problems to be solved by the device]

 When the polishing shaft is held by the V-shaped groove on the outer circumference of the ball bearing, the contact area is two points of contact in terms of geometry. In reality, elastic deformation causes a surface contact, but the contact area is small and the surface pressure is large. As a result, durability often became a problem. The present invention has been made to solve the above problems.

[0004]

[Means for Solving the Problems]

 The polishing shaft (2) is a φ7 axis, and the ball bearing (1) that guides the polishing shaft (2) has a guide groove formed by connecting two R4 circular arcs on the outer circumference so as to make two-point contact with the polishing shaft (2). There is. The present invention is a linear guide mechanism having the above configuration.

[0005]

[Action]

 The structure in which the φ7 polishing shaft is about to move linearly is guided by the polishing shaft by a bearing having a guide groove on the outer circumference, and a smooth linear movement is possible.

[0006]

【Example】

 An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. When the ball bearing (1) guides and holds the φ7 polishing shaft (2), the contact point is the φ7 shaft, that is, the R3.5 shaft and the R4 hole. Since the R4 hole is on a circumference having an axis perpendicular to the polishing axis direction, the contact is geometrically a point contact, but it is a surface contact due to elastic deformation. Since this contact is between the R3.5 axis and the R4 hole, a larger contact area can be obtained compared to when the R3.5 axis is placed on a flat surface. 3 shows the sectional contact width (a) of the present invention, and FIG. 4 (b) shows the sectional contact width of the ball bearing (3) having a V-shaped groove.

[0007]

[Effect of device]

 By increasing the contact area between the polishing shaft and the guide groove on the outer circumference of the ball bearing, the surface pressure of the metal contact portion is reduced and the durability as a linear guide is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a mechanism using the present invention.

FIG. 2 is a front view showing an example of a mechanism using the present invention.

FIG. 3 is a detailed view of a main part of the present invention.

FIG. 4 is a detailed view of a main part of a V-groove ball bearing specification.

[Explanation of symbols]

 1 Ball Bearing 2 Polishing Shaft 3 V Groove Ball Bearing a Contact width of this invention b Conventional mechanism contact width

Claims (1)

[Scope of utility model registration request] 1. A linear guide mechanism composed of a ball bearing having an outer peripheral groove for guiding the polishing shaft and an outer ring tangentially to the outer ring, wherein a φ7 axis is adopted as the polishing shaft and a ball bearing outer periphery for guiding the polishing shaft is provided. A linear guide mechanism in which two R4 circular arcs are combined in a groove cross-sectional shape to make two points of contact.