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Ball Screw Nut

A ball screw nut, ball screw shaft technology, applied in transmission parts, belts/chains/gears, mechanical equipment, etc., can solve problems such as large end caps

Active Publication Date: 2017-09-08
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to install a lubricating member outside such an end cover, the mounting seat for attaching the lubricating member to the end cover needs to be installed so as not to interfere with existing functional parts, and the end cover may be enlarged

Method used

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  • Ball Screw Nut
  • Ball Screw Nut
  • Ball Screw Nut

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0036] Below, through Figure 1-19 An embodiment of the ball screw nut of the present invention will be described in detail. In this embodiment, an example of a case where the ball screw nut of the present invention is applied to a ball screw device of a single-axis robot will be described.

[0037] figure 1 The single-axis robot 1 shown makes the table 2 in figure 1 and figure 2 Reciprocating in the left and right directions. The table 2 is movably supported on the frame 3 of the single-axis robot 1 via the linear guide 4. This single-axis robot 1 includes a ball screw device 5 for driving a table 2.

[0038] The ball screw device 5 includes a motor 6 attached to one end of the frame 3, a ball screw shaft 7 driven and rotated by the motor 6, and a ball screw nut 8 screwed to the ball screw shaft 7.

[0039] One end of the ball screw shaft 7 is rotatably supported by the bearing 9 of the electric motor 6, and is connected to the output shaft 6a of the electric motor 6 via a coupli...

no. 2 approach

[0082] The housing of the lubricating member can be as Figure 20 Formed as shown. in Figure 20 In, for and through Figure 1~Figure 19 The same or equivalent members of the described structure are denoted by the same reference numerals, and detailed descriptions are appropriately omitted.

[0083] The housing 42 of this embodiment has a pressing portion 51 that presses the lubricating pad 44 from the radially outer side to the inner side of the ball screw shaft 7. The pressing portion 51 partially thickens the cylindrical portion between the two convex portions 46 of the housing main body 42a, and is provided on one and the other in the radial direction, respectively. In addition, the convex portion 46 of the housing 42 is formed in a shape that presses the bottom of the groove 45 from the radially outer side to the inner side of the ball screw shaft 7. In other words, the convex portion 46 of this embodiment essentially functions as the pressing portion 51.

[0084] In this w...

no. 3 approach

[0087] The lubrication pad can be as Figure 21 and Figure 22 Structured as shown. in Figure 21 and Figure 22 In, for and through Figure 1~Figure 19 The same or equivalent members of the described structure are denoted by the same reference numerals, and detailed descriptions are appropriately omitted.

[0088] Figure 21 and Figure 22 The lubricating pad 44 shown is formed to Figure 10 ~ Figure 13 The shown lubricating pad 44 has a shape divided in the radial direction of the ball screw shaft 7. The position of division is a position where one groove 45 is divided into two.

[0089] Two of the semicircular lubricating pads 44 are used as a set. That is, the two lubricating pads 44 are accommodated in the housing 42 in a state of being opposed to each other so that the ball screw shaft 7 is sandwiched at the center.

[0090] When lubricating with pad 44 such as Picture 11 When the ring shape is shown, it needs to be assembled to the ball screw shaft 7 in a so-called string-...

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PUM

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Abstract

The invention provides a ball screw nut for mounting lubrication components for lubricant supply outside end caps, thus preventing upsizing of the end caps. The ball screw nut comprises a nut body (21) with a ball rolling groove (28) and a ball return hole (31), a pair of end caps which are respectively arranged on two ends of the nut body (21) through mounting bolts (34, 35), and lubrication components (23) which are arranged the other end of at least one end cap among the pair of end caps (22), wherein the two end caps (22) have identical forms; the lubrication components (23) are provided with lubrication pads (44) which are made of porous resin impregnated lubricant, and housings (42) for containing the lubrication pads (44); and the housings (42) are arranged on the nut body (21) through fastening of the mounting bolts (34, 35) and the end caps (22).

Description

Technical field [0001] The present invention relates to a ball screw nut provided with a lubricating member that supplies lubricant to a ball screw shaft. Background technique [0002] Conventionally, in industrial robots, various manufacturing equipment, etc., a ball screw mechanism is often used when driving a reciprocating member. The ball screw mechanism includes a rotating ball screw shaft and a ball screw nut screwed to the ball screw shaft via a plurality of balls. [0003] The ball screw nut is attached to the reciprocating member in a state where the rotation is restricted. In recent ball screw mechanisms, in order to extend the maintenance interval as much as possible, a structure that can supply lubricant is sometimes adopted. [0004] As a conventional ball screw mechanism capable of supplying lubricant, for example, there is a structure disclosed in JP2005-42796A (Document 1). [0005] The ball screw mechanism described in Document 1 includes a ball screw nut capable of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H25/22
CPCF16H25/2204F16H57/0497
Inventor 深井文宪
Owner YAMAHA MOTOR CO LTD