Browse Prior Art Database

Unit Structure Trolley

IP.com Disclosure Number: IPCOM000047147D
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Aviles, HE: AUTHOR [+3]

Abstract

Bearing systems used in the linear axes of industrial robots are subject to many design constraints. The table below compares three different trolley bearing systems using common design objectives. It can be seen from the table that the tandem bearing trolley is superior to the other two types. The unit structure trolley is an embodiment of the tandem bearing design. (Image Omitted) The unit structure trolley shown in Fig. 1 has the following features: 1. The stiffness of this trolley design can be changed to suit system requirements by varying the wall thickness (J) or the distance between adjacent bearings (K). 2. Each bearing 10 is supported by the walls of the trolley frame 12 which act as miniature cantilever springs.

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Unit Structure Trolley

Bearing systems used in the linear axes of industrial robots are subject to many design constraints. The table below compares three different trolley bearing systems using common design objectives. It can be seen from the table that the tandem bearing trolley is superior to the other two types. The unit structure trolley is an embodiment of the tandem bearing design.

(Image Omitted)

The unit structure trolley shown in Fig. 1 has the following features: 1. The stiffness of this trolley design can be changed to suit system requirements by varying the wall thickness

(J) or the distance between adjacent bearings (K). 2. Each bearing 10 is supported by the walls of the trolley frame 12 which act as miniature cantilever springs.

This feature allows each bearing to ride over minute

surface contaminants or irregularities. 3. The thin webs 14 have sufficient rigidity to maintain good bearing tracking, but are flexible in bending and

torsion to allow the two trolley ends to track surface

irregularities independent of each other. 4. The use of four bearings instead of two reduces the hertzian stress on the rolling surface 16. 5. The low mass and low rotating inertia of this design reduce the wear in bearings 10 during frequent starts and

stops. 6. The counter bores 18 on the frame 12 serve two

purposes. They act as bearing support points and also

maintain alignment of the trolley frame to the bearing

carrier (Fig. 2). 7. The unit structure trolley fra...