JPH10205523A - Manufacture of connecting rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacture of a connecting rod which can improve an accuracy in grinding a joined part of a rod and a ball and productivity in mass production. SOLUTION: A rod 11b and two balls 11a are prepared and the balls 11a are welded to both ends of the rod 11b with a burner 90. After welding, joined parts 60, 60 of the rod 11b and the ball 11a are ground by a grindstone 70 in a state in which the balls on both ends of the rod 11b are rotatably supported by a jig having a V-shaped groove. After ground, the rod 11b is removed from the jig and is cut into two parts at the center thereof to make two connecting rods 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a connecting rod, and more particularly to a method for manufacturing a mass-producing connecting rod which does not require centering.

[0002]

2. Description of the Related Art FIG. 3 is a view for explaining a conventional method for manufacturing a connecting rod.

A conventional method for manufacturing a connecting rod will be described with reference to FIG.

First, one rod 111b and one ball 111a are prepared (see FIG. 3A).
The ball 111a is welded to one end of 1b by a burner 190 (see FIG. 3B).

After welding, the other end of the rod 111b is connected to the jig 15
0 (chuck etc.), and the rod 11
1b is rotated, and the bead of the connection portion 160 between the rod 111b and the ball 111a is polished by the grindstone 170 (see FIG. 3C).

Finally, the rod 111b is removed from the jig 150, and one connecting rod 111 is completed (see FIG. 3D).

[0007]

However, in the above-described manufacturing method, since the rod 111b is rotated in a cantilever state, the rod 111b swings and it is difficult to set the core. It is troublesome to accurately set the rod 111b with respect to the grindstone 170, and there is a problem that the centering is not easy in practice.

In addition, during the polishing process, the position of the connecting portion 160 in contact with the grindstone 170 is far from the supporting position of the rod 111b. Therefore, when the grindstone 170 is brought into contact with the connecting portion 160, the rod 111b of FIG. There is a problem in that the material escapes downward, and processing accuracy cannot be obtained.

Furthermore, since only one connecting rod 111 can be manufactured in one manufacturing process, and since measurement for centering must be performed using a dial gauge during manufacturing, there is a problem that mass productivity is low. there were.

The present invention has been made in view of such circumstances, and an object of the present invention is to manufacture a connecting rod capable of improving the accuracy of finishing processing of a connecting portion between a rod and a ball and improving mass productivity. Is to provide a way.

[0011]

In order to solve the above-mentioned problems, a method for manufacturing a connecting rod according to the present invention comprises a first step of welding balls to both ends of a rod, and after the first step, the two balls are connected to each other by the method. A second step of finishing a connecting portion between the rod and the ball in a state of being supported rotatably about the axis of the rod, and a third step of cutting the rod after the second step. Features.

As described above, the ball is welded to both ends of the rod, and the balls at both ends of the rod are rotatably supported by a jig. Since processing is performed, centering is not required, and the position of the connection portion is close to the fulcrum, and the rod is not bent, so that the accuracy of the finishing processing is improved.

Further, two connecting rods can be manufactured at one time.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a longitudinal sectional view showing a variable displacement type swash plate type compressor having a connecting rod manufactured by a manufacturing method according to an embodiment of the present invention.

The variable displacement type swash plate compressor has a thrust flange 40 which rotates integrally with the shaft 5 and a swash plate 10 which rotates integrally with the rotation of the thrust flange 40.
A piston 7 slidably accommodated in a plurality of cylinder bores 6, and a swash plate 1 as the shaft 5 rotates.
A plurality of shoes 5 relatively rotating on the sliding surface 10a
0, a retainer 53 attached to the swash plate 10 so as to be relatively rotatable and supporting a plurality of shoes 50, and a plurality of shoes 5
A connecting rod 11 is provided for connecting the swash plate 10 and the plurality of pistons 7 via the respective swash plates 10.

The thrust flange 40 is fixed to the shaft 5.

The swash plate 10 has a hinge ball 9 on the shaft 5.
And is connected to the thrust flange 40 via a link mechanism 41.

The connecting rod 11 is a rod 11
b and a ball 11a welded to one end of the rod 11b. The rod 11b is fixed to the piston 7 using a retaining pin 80, and the shoe 50 is swaged to the ball 11a so as to swing.

FIG. 1 is a diagram for explaining a method of manufacturing a connecting rod according to this embodiment.

First, as shown in FIGS. 1A and 1B, one rod 11b and two balls 11a, 11a
And a ball 11 is provided at each end of the rod 11b.
a and 11a are welded by a burner 90 (first step).

After welding, as shown in FIG. 1 (c), the balls 11a, 11a at both ends of the rod 11b are rotatably supported by a jig (not shown) having a V-shaped groove. The grindstone 70 is applied to the connection portions 60, 60 with the balls 11a, 11a, and is polished (finished) (second step).

At this time, the rod 11b and the ball 11a,
11a rotates in the opposite direction to the grindstone 70.

Since the position where the whetstone 70 hits is close to the fulcrum,
Since the rod 11b does not bend, processing accuracy is obtained.

The grindstone 70 has a cylindrical shape, and is provided with convex portions 70a, 70a along the circumferential direction on the outer peripheral surfaces of both ends of the grindstone 70. The connecting portions 60 are polished by the convex portions 70a.

After polishing, as shown in FIG. 1D, the rod 11b is removed from the jig, the center of the rod 11b is cut, and the rod 11b is divided into two parts (third step). As a result, two connecting rods 11 are completed.

When the rotational power of a vehicle-mounted engine (not shown) is transmitted to the shaft 5, the rotational force of the shaft 5 is transmitted from the thrust flange 40 to the swash plate 10 via the link mechanism 41, and the swash plate 10 rotates.

The rotation of the swash plate 10 causes the shoe 50 to move the swash plate 1
The rotation force from the swash plate 10 is converted into a linear reciprocating motion of the piston 7. When the piston 7 reciprocates in the cylinder bore 6, the volume of the compression chamber in the cylinder bore 6 changes, and the suction, compression, and discharge of the refrigerant gas are sequentially performed by the change in the volume. Swash plate 11
Since the inclination angle of the swash plate 10 changes according to the change in the pressure of the crank chamber 8 in which 0 is stored, high-pressure refrigerant gas having a capacity corresponding to the inclination angle of the swash plate 10 is discharged.

According to this embodiment, the balls 11a, 11a are welded to both ends of the rod 11b, and the balls 11a, 11a at both ends of the rod 11b are rotatably supported by a jig having a V-shaped groove. 11b and ball 11a,
Since the grindstone 70 is applied to the connecting portions 60 and 60 to be polished, the centering becomes unnecessary, and the position of the connecting portion 60 becomes closer to the fulcrum, the rod 11b does not bend and the polishing process is performed. The accuracy is improved.

Further, since two connecting rods 11 are manufactured at a time, mass productivity is improved as compared with the conventional example.

In this embodiment, the case where the present invention is applied to the connecting rod 11 of a variable displacement swash plate type compressor has been described. However, the present invention is also applicable to connecting rods of other types of refrigerant compressors. It is.

[0032]

As described above, according to the method of manufacturing the connecting rod of the present invention, the centering is not required, and the position of the connecting portion is close to the fulcrum, so that the rod is not bent. The accuracy is improved and the manufacturing operation is facilitated.

Further, since two connecting rods can be manufactured at one time, mass productivity is improved.

[Brief description of the drawings]

FIG. 1 is a view for explaining a method for manufacturing a connecting rod according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a variable displacement swash plate type compressor having a connecting rod manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 3 is a view for explaining a conventional method for manufacturing a connecting rod.

[Explanation of symbols]

 11 connecting rod 11a ball 11b rod 60 connecting part 70 whetstone

Claims (1)

[Claims] A first step of welding balls to both ends of a rod; and after the first step, a connection between the rod and the ball in a state where the two balls are rotatably supported around an axis of the rod. A method for manufacturing a connecting rod, comprising: a second step of finishing a portion; and a third step of cutting the rod after the second step.