Linear motion guide apparatus

Patent metadata

Field	Value
Publication number	US-12410834-B2
Application number	US-202118263298-A
Country	US
Kind code	B2
Filing date	Nov 5, 2021
Priority date	Jan 29, 2021
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A linear motion guide apparatus in which a guide rail can be readily provided with a meshing portion that meshes with a gear is provided. The linear motion guide apparatus includes: two guide rails that are movable relative to each other in a longitudinal direction thereof via at least one rolling element; and a cage configured to hold the rolling element and rotatably hold a gear engaging with a meshing portion provided to at least one of the two guide rails. The meshing portion includes a plurality of circular holes arranged in the longitudinal direction on the guide rail. Each of the circular holes has a wall surface formed in a cylindrical shape.

First claim

The invention claimed is:

1. A linear motion guide apparatus comprising:
two guide rails that are movable relative to each other in a longitudinal direction thereof via at least one rolling element; and
a cage configured to hold the rolling element and rotatably hold a gear engaging with a meshing portion provided to at least one of the two guide rails, wherein
the meshing portion includes a plurality of circular holes arranged in the longitudinal direction on the guide rail,
each of the circular holes has a wall surface formed in a cylindrical shape, and
a gap (g 1 ) in a rotational direction of the gear between a tooth tip portion of each tooth of the gear and the wall surface of the circular hole is smaller than a gap (g 2 ) in a rotation axis direction of the gear.

2. The linear motion guide apparatus according to claim 1 , wherein the circular holes are formed directly in the guide rail.

3. The linear motion guide apparatus according to claim 1 , wherein bottom surfaces of the circular holes are formed flat.

4. The linear motion guide apparatus according to claim 2 , wherein bottom surfaces of the circular holes are formed flat.

5. A linear motion guide apparatus comprising:
two guide rails that are movable relative to each other in a longitudinal direction thereof via at least one rolling element; and
a cage configured to hold the rolling element and rotatably hold a gear engaging with a meshing portion provided to at least one of the two guide rails, wherein
the meshing portion includes a plurality of circular holes arranged in the longitudinal direction on the guide rail,
each of the circular holes has a wall surface formed in a cylindrical shape, and

a length, in a rotational direction, of a tooth tip portion of each tooth of the gear is greater than a face width of the tooth tip portion.

6. The linear motion guide apparatus according to claim 5 , wherein the circular holes are formed directly in the guide rail.

7. The linear motion guide apparatus according to claim 6 , wherein bottom surfaces of the circular holes are formed flat.

8. The linear motion guide apparatus according to claim 5 , wherein bottom surfaces of the circular holes are formed flat.

9. A linear motion guide apparatus comprising:
two guide rails that are movable relative to each other in a longitudinal direction thereof via at least one rolling element; and
a cage configured to hold the rolling element and rotatably hold a gear engaging with a meshing portion provided to at least one of the two guide rails, wherein
the meshing portion includes a plurality of circular holes arranged in the longitudinal direction on the guide rail,
each of the circular holes has a wall surface formed in a cylindrical shape, and

a dedendum portion of each tooth of the gear is constricted as viewed in a rotation axis direction of the gear.

10. The linear motion guide apparatus according to claim 9 , wherein the circular holes are formed directly in the guide rail.

11. The linear motion guide apparatus according to claim 10 , wherein bottom surfaces of the circular holes are formed flat.

12. The linear motion guide apparatus according to claim 9 , wherein bottom surfaces of the circular holes are formed flat.

Assignees

• Thk Co Ltd

Inventors

• Zhao Bin
• Ikegami nobuyuki

Classifications

• F16C29/005

  Guide rails or tracks for a linear bearing, i.e. adapted for movement of a carriage or bearing body there along · CPC title

• F16C29/041 Primary

  having rollers crossed within a row · CPC title

• F16C33/46

  Cages for rollers or needles · CPC title

• F16H55/08

  Profiling · CPC title

• F16C19/36

  with a single row of rollers · CPC title