JP2596762B2 - Mechanical element coupling mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial application field The present invention is intended to keep the state during processing and the state after manufacturing the same when manufacturing a mechanical element coupling mechanism, particularly a mechanical part. The present invention relates to a mechanism for coupling mechanical elements.

(2) Prior Art In order to manufacture a machine part, two or more machine elements constituting the machine part are separately processed, and then
At almost the final stage of the manufacturing process, it is often the case that the mechanical components are assembled and finished to produce the mechanical components. Then, when the completed machine part is operatively connected to another machine part, the machine part is disassembled into machine elements again and connected to the other machine parts for assembly.

An example of a mechanical component constituted by such a combination of mechanical elements is a connecting rod (connecting rod, hereinafter simply referred to as a connecting rod) used in an automobile engine, and a conventional example thereof is shown in FIG. This connecting rod 1 has a connecting hole 2 at one end connected to a piston of an engine, and a rod body 3 as a mechanical element having a part of a connecting hole 4 formed at the other end to be connected to an arm of a crankshaft. And a receiving member 5 as another mechanical element, in which the remaining portion of the connecting hole 4 is formed and is brought into contact with and connected to the other end of the rod body 3. The rod body 3 and the receiving member 5 are fastened by a coupling mechanism 6 provided between the two members 3,5. The coupling mechanism 6 includes, on both sides of the connecting hole 4, a screw through hole 7 formed through the rod body 3 toward the receiving member 5, a bolt 8 inserted into the screw through hole 7, A nut 9 screwed into the bolt 8, the bolt 8 is inserted into the screw hole 7,
The rod body 3 and the receiving member 5 are connected by screwing and tightening the nut 9 from the distal end side of the bolt 8.

(3) Problems to be Solved by the Invention By the way, as described above for the connecting rod 1, the rod body 3 and the receiving member 5 are once assembled to perform finishing, and then the connecting rod 1 as one mechanical part is disassembled. After that, when assembling the crankshaft arm, which is another mechanical part, without rattling or loosening, the shape of the connecting hole 4 is substantially the same at the time of the machining completion and at the time of arm attachment. Need to be kept. Then, in order to keep the shape of the connecting hole 4 the same, the tightening force between the bolt 8 and the nut 9 in the coupling mechanism 6 must be the same in the second assembly. In order to maintain the same tightening force of the coupling mechanism 6 in these two assemblings, the tightening state when the nut 9 is tightened to the bolt 8 must be the same. To reproduce this same tightening state When the rod body 3 and the receiving member 5 are assembled twice, the combination of the bolt 8 and the nut 9 must be the same.

However, in the conventional mechanical element coupling mechanism 6 as described above, the rod body 3 and the receiving member 5 are once assembled in the process of manufacturing the connecting rod 1, and the connecting hole 4 is subjected to finish processing, and then is again processed. When the rod body 3 and the receiving member 5 are disassembled, the bolt 8 and the nut 9 are both detached from the connecting rod 1, and the combination of the bolt 8 and the nut 9 when the two members 3, 5 are assembled first. Matching cannot be reproduced. That is, in general, the connecting rod 1 is mass-produced, and the rod body 3 and the receiving member 5 are joined by a flow operation, and after the connecting hole 4 is finished, the rod body 3 and the receiving member 5 are again formed. When the bolt 8 and the nut 9 are disengaged from the connecting rod 1 by this disassembly, the bolt 8 and the nut 9 are lost to the bolt 8 and the nut 9 of the other connecting rod 1. For this reason, regarding a certain bolt 8, the possibility that the nut 9 combined in the first assembling of the connecting rod 1 and the nut 9 combined in the second assembling of the connecting rod 1 are reduced.

Therefore, when the connecting rod 1 is attached to the arm of the crankshaft and the bolts 8 and the nuts 9 are tightened, the shape of the connecting hole 4 does not come out correctly, and rattling occurs between the connecting rod 1 and the crankshaft. Or there was a fear.

The occurrence of such a situation should be prevented by assigning identification numbers to all bolts and nuts and managing them so that the combination of bolts and nuts becomes the same in the assembly of the connecting rod 1 twice. Can be. However, for mass-produced products such as the connecting rod 1, it is not practical to manage the combination of bolts and nuts, and if this is to be performed, a large amount of money is required for management. There is a problem that the cost is increased.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a mechanical part which is disassembled into a plurality of mechanical elements from the time of manufacture to the time of installation, before and after disassembly. The purpose of the present invention is to provide a coupling mechanism for mechanical elements that can realize the same tightening force.

(4) Means for Solving the Problems In order to achieve the above object, the present invention provides a coupling mechanism for fastening first and second mechanical elements constituting a mechanical part by assembly. A through hole is formed in one of the holes, a female screw is formed in the part of the other machine element corresponding to this through hole, and a collar is attached between the head and the threaded part of the male screw so that it cannot fall off. The gist of the present invention is that the external thread is screwed into the internal thread while the collar is pressed into the through hole, and the mechanical element is connected.

(5) Operation In manufacturing a mechanical part, machining such as cutting is separately performed on each of the mechanical elements constituting the mechanical part. When the finishing process is started, the first mechanical element and the second mechanical element are combined, and a male screw member (for example, a bolt) equipped with a collar is inserted into the through hole. Since the bolt is provided at the tip of the through hole, it is screwed into the screw portion and tightened. When performing this tightening, the collar is press-fitted into the through hole and is fixedly connected in the through hole. Thus, the first assembly of the first and second mechanical elements is completed. After that, the connecting portion of the machine component is subjected to a drilling finish process and the like, and when the manufacturing process is completed, the machine component is then disassembled and attached to another machine component. When the mechanical parts are disassembled, the bolts are fixed to the through holes by press-fitting, so that the bolts do not come off from the mechanical elements having the through holes. And
When mounting (or connecting) to other mechanical parts, the first and second
When the above mechanical elements are assembled, the coupling mechanism is tightened with the same bolts as in the first assembly.
For this reason, in the coupling mechanism, the same axial force acts on the bolts at the time of the first and second assemblings, so that the finished processed shape becomes the same.

(6) Embodiment FIGS. 1 to 3 are views showing an embodiment of a coupling mechanism for mechanical elements according to the present invention.

In this embodiment, an example of application to a connecting rod 11 used as an engine component, that is, a connecting rod is shown. The connecting rod 11 includes a first mechanical element having a connecting hole 12 at one end and a portion 14a of a connecting hole 14 formed at the other end and connected to an arm of a crankshaft, that is, a rod body 13; Receiving portion 15 as a second mechanical element, the remaining portion 14b of which is formed and is abutted and connected to the other end of the rod body 13.
Consisting of

The rod body 13 and the receiving member 15 are fastened by a coupling mechanism 16 provided between the two members 13, 15. In this embodiment, as shown in FIG. 2, the coupling mechanism 16 is formed on both sides of the rod body 13 so as to extend in the direction toward the mounting side of the receiving member 15, and a female screw 20 and a female screw 20 are provided.
20 is formed on the part of the receiving member 15 corresponding to
A through hole 17 extending in a direction continuous with the bolt, a male screw or a bolt 18 inserted into the through hole 17 from the receiving member 15 side and screwed to the female screw 20, and mounted on a shaft portion of the bolt 18 and 18 and a collar 19 inserted into the through hole 17. A receiving member is provided at the entrance of the female thread 20 of the rod body 13.
A bolt receiving hole 21 which is continuous with the through hole 17 at the time of assembling 15 is formed. The inner diameter of the bolt receiving hole 21 (referred to as D) and the inner diameter of the through hole 17 (referred to as d)
Is not particularly limited, but is preferably set to satisfy, for example, d ≦ D. Also, comparing the inner diameter of each of the holes 17, 21 and the outer diameter of the collar 19, the collar 19 is fixedly connected to the through hole 17 by press fitting, while the collar 19 fits loosely into the bolt receiving hole 21. Dimensions are set. Also, color 19 to bolt 18
Attach the bolt 19 to the bolt material in advance when manufacturing the bolt 18.
After mounting, the threaded portion is rolled so that the collar 19 does not fall off the shaft portion of the bolt 18. At this time, the inner diameter of the collar is set larger than the bolt shaft diameter and smaller than the screw outer diameter.

In such a configuration, when the connecting rod 11 is manufactured, the rod body 13 and the receiving member 15 are joined together at the joint surface 22, and bolts are inserted into the through holes 17 formed in the receiving member 15 from below to above in FIG. While inserted, the collar 19 is then pressed in the same direction. When the threaded end of the bolt 18 reaches the female screw 20 on the rod body 13 side, the bolt 18 is screwed in. The screwing also pushes the collar 19 into the through hole 17 and further reaches the bolt receiving hole 21. Color 19
The outer diameter of the collar 19 and the inner diameters of the through hole 17 and the bolt receiving hole 21 are set in the above-described dimensional relationship, so that the collar 19 fits tightly into the through hole 17 and loosely fits into the bolt receiving hole 21.

After the rod body 13 and the receiving member 15 are once connected as described above, the connecting rod 11 is subjected to finishing processing of the connecting hole 14 by cutting or other operations. When this finishing is completed, the bolt 18 is loosened, and the connecting rod 11 is disassembled into the rod body 13 and the receiving member 15. During this disassembly, the collar 19 is loosely fitted in the bolt receiving hole 21, so if the bolt 18 comes off from the female screw 20, the collar 19 will also easily fall out of the bolt receiving hole 21 and the connecting rod 11 will be disassembled. However, looking at the receiving member 15, the collar 19
Is firmly fitted in the through hole 17 and does not fall out of the through hole 17, whereby the bolt 18 and the collar 19 remain attached to the receiving member 15.

Thereafter, in the engine assembly process, when the connecting rod 11 is attached to the arm of the crankshaft, the connecting portion of the arm is inserted into the connecting hole 14 so that the rod body 13 is connected.
When the first member 13 and the receiving member 15 are assembled, the two members 13 and 15 are connected by the same bolt 18 as in the first assembly. For this reason, the rod body 13 and the receiving member 15
When assembling, the tightening force (axial force) of the bolt 18 in the coupling mechanism 16 can be made the same, and the shape of the connecting hole 14 is kept constant.

In this embodiment, the connecting rod connected to the crankshaft has been described as an example. However, the present invention is also applicable to a mechanical component such as a bearing cap which is repeatedly processed, disassembled, and assembled.

(7) Effects of the Invention As described above, according to the present invention, a through hole is formed in one of the first and second mechanical elements assembled together, and the other mechanical element corresponding to the through hole is formed. A coupling mechanism that forms a female screw in the part, attaches a collar to the shaft of the male screw that is screwed into the female screw, and screws the male screw into the female screw while firmly fitting the collar into the through hole. Did
The assembly and disassembly of the machine element can be repeated using the same combination of a male screw and a female screw. For this reason, the fastening force by the coupling mechanism 6 at the time of assembling can be made substantially constant, thereby making it possible to maintain the same component shape at the production projection. As a result, it is possible to satisfactorily match the coupling portion between one mechanical component and another mechanical component, and to prevent rattling or movement disturbance.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a connecting rod to which a mechanism for coupling mechanical elements according to the present invention is applied, FIG. 2 is an exploded view of the connecting rod according to the embodiment, and FIG. Figure showing the combination of bolts and collars
FIG. 4 is a view showing an example of a connecting rod using a conventional mechanical element coupling mechanism. 11 Connecting rod (mechanical part) 13 Rod body (mechanical element), 14 Connecting hole 15 Receiver member (mechanical element), 16 Coupling mechanism 17 Through hole, 18 bolt 19) Collar, 20 Female thread 21 Bolt receiving hole

Claims (1)

(57) [Claims] 1. A mechanism for coupling a first mechanical element and a second mechanical element coupled to the first mechanical element to form a completed mechanical part, wherein the first and the second mechanical elements are coupled to each other. A through hole is formed in one of the second machine elements, a female screw is formed in a portion of the other machine element corresponding to the through hole, and a shaft of a male screw is formed in the through hole. The collar to be press-fitted and fixed is mounted so as not to fall off, a screw is inserted into the through-hole and the collar is press-fitted, and the male screw is screwed into the female screw while firmly fitting the collar into the through-hole. A mechanism for coupling mechanical elements, wherein the mechanical element and the second mechanical element are fastened.