US 8,910,366 B2 · Press-fitting method of member and press-fitting apparatus

Abstract

The invention provides a press-fitting method of a member and a press-fitting apparatus in which press-fitting errors can be reduced, without using a dummy pin. The pressing jig 45 includes a main body 46 having a guide pin containing part 47 which is open downward, a compression coil spring (a resilient member) 48 which is contained in an upper part of the guide pin containing part 47, a guide pin 49 which is contained in a lower part of the guide pin containing part 47 with its lower end portion projected downward from a lower face of the main body 46 by an urging force of the compression coil spring 48, and a permanent magnet 50 in an annular shape which is fixed to the lower face of the main body 46, as attracting and holding unit for attracting and holding the press-fitting member 11.

Drawings

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Drawings

Claims17

Dependent claims

A press-fitting method comprising:

holding a lower end portion of a rod member to be press-fitted with a holding jig;
and
while holding a link member including an insertion hole with a pressing jig, moving the pressing jig downward to sequentially push the link member to a determined position of the rod member,
wherein the pressing jig includes:
a main body having a guide pin containing part which is open downward;
a resilient member which is contained in an upper part of the guide pin containing part;
a guide pin which is contained in a lower part of the guide pin containing part with a lower end portion thereof projected from the main body by an urging force of the resilient member;
and
an attracting and holding unit configured so as to attract and hold the link member so as to move in a direction perpendicular to an axis of the guide pin,
wherein the rod member includes a chamfered part at an end thereof,
wherein the link member is attracted and held by the pressing jig,
wherein the moving the pressing jig is performed after the insertion hole of the link member has been aligned with the chamfered part of the rod member,
wherein, in a process of the moving the pressing jig downward, the lower end portion of the guide pin is brought into contact with an upper end face of the rod member and then, the guide pin is pushed into the guide pin containing part by the upper end face of the rod member, and, when only a chamfered part of the guide pin and the chamfered part of the rod member are entered into the insertion hole of the link member, the link member can move in the direction perpendicular to the axis of the guide pin, and
wherein the holding the link member further includes holding the link member on, and in a direct contact with, a magnetized surface.

11 more elements

Dependencies are inferred from the claim text.

Description2,989 words

Summary1,457 words

#The present invention relates to a press-fitting method of a member and a press-fitting apparatus which are used when a link (a press-fitting member in a plate-like shape) is press-fitted onto a pin (a member in a rod-like shape to be press-fitted), in assembling, for example, a power transmission chain including the links and pins.

#As a power transmission chain, there has been known a structure including a plurality of links which are arranged in a lateral direction of the chain, and a plurality of pins for interconnecting the links which are respectively inserted into the links to be fixed thereto by press-fitting. As a manufacturing method for this power transmission chain, it has been known that a required number of the pins are uprightly arranged and held in a state of arrangement where they have been assembled as the chain, and thereafter, the links are sequentially press-fitted onto these pins, one by one, from a lower end side thereof.

#In this conventional press-fitting method, press-fitting errors sometimes occur due to a relative displacement between the pin and the link, and it has been a problem to reduce the press-fitting errors, by enhancing allowance of the relative displacement. In order to solve this problem, it has been proposed in Patent Document 1 to use a dummy pin.

Brief description of the drawings3 figures

#FIG. 1 is a vertical sectional view of a press-fitting apparatus according to the invention.

#FIG. 2 is a vertical sectional view of the press-fitting apparatus according to the invention, showing a state in the middle of press-fitting.

#FIG. 3 is a plan view showing a part of an embodiment of a power transmission chain, which is an example of a product manufactured by using the press-fitting method of a member and the press-fitting apparatus according to the invention.

Detailed description1,453 words

#Now, an embodiment of the invention will be described referring to the drawings. In the following description, “upside and downside” correspond to an upside and a downside in FIGS. 1 and 2.

#FIG. 3 is a plan view showing a part of a power transmission chain, which is an example of a product manufactured by using the press-fitting method and the press-fitting apparatus according to the invention. A power transmission chain 1 includes a plurality of links 11 each having through holes 12, 13 which are provided at a determined interval in a longitudinal direction of the chain, and a plurality of first pins 14 and second pins 15 for interconnecting the links 11 which are arranged in a lateral direction of the chain, in such a manner that the links can be flexed in the longitudinal direction of the chain. The second pin 15 is made shorter than the first pin 14. Both the pins are opposed to each other in such a manner that the second pin 15 is arranged at a front side and the first pin 14 is arranged at a back side.

#In order to manufacture this power transmission chain 1, it is necessary to sequentially press-fitting the links 11 (formed of magnetic substance) onto the pins 14, 15 up to a determined position in the lateral direction of the chain, after a required number of the pins 14, 15 have been arranged at a determined pitch and held in a state of arrangement where they have been assembled as the chain 1. For this purpose, a press-fitting apparatus 40 for holding the rod-like members to be press-fitted (that is, the pins 14, 15) by a holding jig 41, and at the same time, for sequentially press-fitting the press-fitting members (that is, the links 11) by a pressing jig 45 is used.

Facts

Application

12/735,210Filed 24 Dec 2008

Priority

JP P2007-33168925 Dec 2007

Published

US 2010/0275434 A14 Nov 2010

Granted

16 Dec 2014

Term ends

6 Aug 2029

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 225 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification12 codes

B25B 27/02
Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise…: for…
B21L 9/065
Sorting, feeding, assembling, riveting, or finishing parts of chains: assembling or disassembling
B23P 19/02
Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some…
Y10T 29/49945
Assembling or joining: by driven force fit

Timeline

25 Dec 2007Priority claimedJP P2007-331689
24 Dec 2008Application filedUS 12/735,210
22 Jun 2010Assigned to Jtekt Corporationassignment of assignor's interest
4 Nov 2010PublishedUS 2010/0275434 A1
16 Dec 2014GrantedUS 8,910,366 B2
12 Oct 2026TodayWithin its term
6 Aug 2029Term endsEstimated, includes 225 days of adjustment

Press-fitting method of member and press-fitting apparatus

Life of this patent

Press-fitting method of member and press-fitting apparatus

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims17

Description2,989 words

Drawings

Description2,989 words

Classification12 codes

Life of this patent