JPH04171283A - Piston device for compressor - Google Patents

Abstract

PURPOSE:To reduce the number of parts and machining points by forming a recessed part in the end part of a piston pin through hole, and fixing the piston pin at a piston by a spring with the first tense fixing part which is tensed in the through hole of the piston pin and the second tense fixing part which is tensed in the recessed part of a piston provided integratedly. CONSTITUTION:A chamfered recessed part 15 is formed at the upper end of a through hole 7, and a through hole 16 is also formed in a piston pin 13. The piston pin 13 is fixed at a piston 2 by a coil spring 19 with the first tense fixing part 17 which is tensed so that it may be enlarged at an end in the through hole 16 of the piston pin and the second tensed fixing part 18 which is tensed so that it may be enlarged in the recessed part 15 of the piston 2 provided integratedly. The piston pin 13 is fixed at the piston 2 only by simple pressing-in work that the first tense fixing part 17 of the coil spring 19 is pressed in the end of the through hole 16 in the pin, and the second tense fixing part 18 is fitted in the recessed part 15 of the piston 2 after the piston pin 13 is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a piston device for a compressor used in refrigerators and freezer showcases.

(b) Conventional technology Conventionally, the piston device of a compressor was
As shown in the publication, a piston having a through hole in a direction perpendicular to the axial direction and having a hollow interior, a connecting rod having a small diameter part at one end and a large diameter part at the other end, and a rotating shaft are formed. The small diameter part of the connecting rod is inserted into the hollow part of the piston, the piston pin is inserted into the through hole and the hole of the small diameter part, and the large diameter part is inserted into the eccentric part. This connects the piston and the rotating shaft. The piston pin is fixed by a fixed pin inserted into the pin, and is prevented from coming off from the piston.

(c) Problems to be Solved by the Invention However, according to the above configuration, the piston pin is fixed by a separate fixing pin that is inserted into the pin from the orthogonal direction, which increases the number of parts and assembly man-hours. In addition, there was a problem in that a very long and narrow through hole had to be formed in the piston bottle, which required highly accurate micromachining.

The present invention was developed in view of these points, and it is possible to fix the piston pin with a simple structure, reduce the number of parts and processing man-hours, and eliminate micro-machining that requires skill, thereby increasing the productivity of the compressor. The purpose is to provide piston equipment.

(d) Means for Solving the Problems The present invention provides a piston having a through hole in a direction perpendicular to the axial direction and having a hollow interior, and a connecting rod having a small diameter portion at one end and a large diameter portion at the other end. and an eccentric part formed on the rotating shaft, and the small diameter part of the connecting rod is inserted into the hollow part of the piston,
The piston pin is inserted into the through hole and the hole in the small diameter part, and the piston and the rotating shaft are connected by fitting the large diameter part into the eccentric part, While forming a recess, a through hole is provided in the piston pin,
a first adhering portion adhering within the through hole of the piston pin;
The piston pin is fixed to the piston by a spring that integrally has a second tensioning part that is tensioned within the recess of the piston.

(e) Function The piston device for the compressor of the present invention has the above-described configuration, and after the piston pin is inserted into the through hole of the piston and the hole of the small diameter portion, the first tensioned portion of the spring is press-fitted into the through hole of the bottle. At the same time, the piston pin can be fixed to the piston by simply fitting the second adhesive part to the four parts of the piston, and the number of parts can be reduced by eliminating the fixing pin for the piston pin in the conventional configuration. It is possible to improve the productivity of the compressor by reducing the number of processing steps and the number of processing steps, and by eliminating fine processing that requires skill.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a piston device for a reciprocating compressor, and 1 is a motor case in which a cylinder 3 in which a piston 2 reciprocates, and a bearing 5 that pivotally supports a rotating shaft 4 are integrally formed.

The piston 2 has a hollow portion 6 and a through hole 7 in a direction perpendicular to the axial direction. 8 is a connecting rod having a small diameter section 9 at one end and a large diameter section 10 at the other end. 11 is the rotating shaft 4
It is an eccentric part formed in The piston device of such a compressor is constructed by inserting the small diameter portion 9 of the connecting rod 8 into the hollow portion 6 of the piston 2, and inserting the through hole 7 and the hole 12 of the small diameter portion 9 into the hollow portion 6 of the piston 2.
The piston 2 and the rotating shaft 4 are connected by inserting the piston pin 13 into the piston 2 and fitting the large diameter portion 10 into the eccentric portion 11 via the collar 14. Here, a chamfered recess I5 is formed at the upper edge of the through hole 7, while a through hole 16 is formed in the piston pin 13. The piston pin 13 has a first sticking part 17 that spreads at the end inside the through hole 16 of the piston pin, and a first sticking part 17 that spreads in the recess 15 of the piston 2. The piston 2 is fixed to the piston 2 by a coil spring 19 that integrally has a second tensioning portion 18 that is fixed to the piston 2.

In the compressor piston device configured in this way, the piston pin 1 is inserted into the through hole 7 of the piston 2 and the hole 12 of the small diameter portion 9.
3, the first tension part 17 of the coil spring 19 is press-fitted into the end of the through hole 16 of the pin, and the second tension part 18 is fitted into the fourth part I5 of the piston 2. The piston pin 13 can be fixed to the piston 2 with just work, eliminating the fixing bin for the piston pin in the conventional configuration, reducing the number of parts and processing man-hours, and micro-machining that requires skill for the piston pin. The productivity of the compressor can be improved by eliminating the

Further, FIGS. 4 and 5 show another embodiment in which the above-described coil spring 19 is replaced with a spring 20 having the shape shown in the figure. In this case as well, the through hole 1 of the piston pin 13 is
6, press fit the first tension part 21 of the spring 20 into the second tension part 6, and
The piston pin 13 can be fixed to the piston 2 by simply fitting and fitting the adhesive part 22 into the recess 15 of the piston 2, and the same effect can be obtained.

(G) Effects of the Invention As described above, the present invention provides the following advantages: After inserting the piston pin into the through hole of the piston and the hole of the small diameter portion, the first tensioned portion of the spring is press-fitted into the through hole of the bottle, and the The piston pin can be fixed to the piston with a simple press-fitting operation of fitting the two adhesive parts to the four parts of the piston, eliminating the conventional fixing pin for the piston pin, reducing the number of parts and machining man-hours. In addition, the productivity of the compressor can be improved by eliminating fine machining that requires skill.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a piston device of a reciprocating compressor of the present invention, Fig. 2 is a sectional view of main parts of the piston device, Fig. 3 is an exploded perspective view of the piston device, and Fig. 4 shows other embodiments. FIG. 5 is an exploded perspective view of the piston device showing another embodiment. 2... Piston, 4-... Rotating shaft, 7-... Through hole,
8... Connecting rod, 9... Small diameter portion, 13... Piston pin, 15... Recess, 16... Through hole, 17.21
...first adhesion part, 18.22...second adhesion part,
19.20...Spring. Figure 1 Figure 2 Back Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) A piston that has a through hole in a direction perpendicular to the axial direction and is hollow inside, a connecting rod that has a small diameter part at one end and a large diameter part at the other end, and an eccentric part formed on the rotating shaft. Consisting of
The small diameter part of the connecting rod is inserted into the hollow part of the piston, the piston pin is inserted into the through hole and the hole in the small diameter part, and the large diameter part is inserted into the eccentric part to connect the piston and the rotating shaft. A recess is formed at the edge of the through-hole, a through-hole is provided in the piston pin, and a first attachment part is attached within the through-hole of the piston pin; A piston device for a compressor, characterized in that the piston pin is fixed to the piston by a spring integrally having a second tensioning portion that is tensioned within the recess of the piston.