ASSEMBLY JIG FOR PINS FOR POWER TRANSMISSION CHAIN

• US 20120146278A1
• Filed: 12/07/2011
• Published: 06/14/2012
• Est. Priority Date: 12/10/2010
• Status: Active Grant

• Current Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Original Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Inventors: FUSAYASU, Kouji, KANEMOTO, Akihito
• Granted Patent: US 9,199,302 B2
• Time in Patent Office: Days
• US Class Current: 269/287
• CPC Class Codes: B21L 19/00 Appurtenances for chain-making not restricted to any particular process
• CPC Class Codes: B21L 9/065 Assembling or disassembling

Abstract

An assembly jig for pins includes a jig body in which pin insertion recesses, into which respective pairs of pins and interpieces are inserted, are aligned at predetermined intervals, and urging devices that urge lower end portions of both the pins and the interpieces, which are fitted in the pin insertion recesses, in the direction perpendicular to the axial direction of the pins and the interpieces. In the jig body, urging device installation recesses are formed so as to be contiguous with the consecutive pin insertion recesses. Each urging device is arranged in the corresponding urging device installation recess, and includes a helical compression spring of which the urging direction is the radially outward direction, and a pressing member urged by the helical compression spring. The pressing member has a first pressing face that contacts the pin, and a second pressing face that contacts the interpiece.

Claims

1. An assembly jig for pins, which is used to manufacture a power transmission chain that includes a plurality of links each having front and rear insertion portions through which pins are passed, and a plurality of first pins and a plurality of second pins, wherein each first pin and a corresponding one of the second pins are aligned next to each other in a longitudinal direction of the links, and the first pins and the second pins connect the links, aligned in a chain width direction, to each other such that the front insertion portion of one link corresponds to the rear insertion portion of another link, wherein the first pins and the second pins move while being in rolling contact with respect to each other, so that the links are flexural with respect to each other in a chain length direction, and wherein one of the first pin and the second pin is fixed to the front insertion portion of the one link through press-fitting and is movably fitted in the rear insertion portion of the other link, and the other of the first pin and the second pin is movably fitted in the front insertion portion of the one link and is fixed to the rear insertion portion of the other link through press-fitting,

the assembly jig comprising

a jig body in which pin insertion recesses, into which respective pairs of pins are inserted, are aligned at predetermined intervals,

the assembly jig characterized in that:

the jig body has urging device installation recesses formed so as to be contiguous with the respective pin insertion recesses; and

in each urging device installation recess, there is arranged an urging device that urges a lower end portion of the pin fitted in the pin insertion recess in a direction perpendicular to an axial direction of the pins.

2. The assembly jig for pins for a power transmission chain according to claim 1:

wherein the urging device installation recesses are formed so as to be contiguous with the respective pin insertion recesses in a direction in which the pin insertion recesses are aligned; and

wherein each urging device is a leaf spring of which an urging direction coincides with the direction in which the pin insertion recesses are aligned.

3. The assembly jig for pins for a power transmission chain according to claim 1:

wherein each urging device installation recess is formed between the consecutive pin insertion recesses so as to be contiguous with the consecutive pin insertion recesses;

wherein each urging device includes a coil spring of which an urging direction is perpendicular to the direction in which the pin insertion recesses are aligned, and a pressing member that is urged by the coil spring; and

wherein the pressing member has a first pressing face that contacts the pin which is located in one of the consecutive pin insertion recesses, on a side close to the other pin insertion recess, at a predetermined angle with respect to the direction in which the pin insertion recesses are aligned, and a second pressing face that contacts the pin which is located in the other pin insertion recess, on a side close to the one of the consecutive pin insertion recesses, at a predetermined angle with respect to the direction in which the pin insertion recesses are aligned.