JPH039083A - Piston rod for swash plate type fluid equipment and manufacture thereof - Google Patents

Abstract

PURPOSE:To make both lightweight design and strength compatible by forming a hollow part respectively in a pair of spherical parts at both ends of a piston rod and a rod-shaped part for connecting each spherical part, and applying larger wall thickness to the rod-shaped part. CONSTITUTION:The piston rod 6 for the swash plate type fluid equipment of a compressor 24 is formed with a pair of spherical parts 16 and 17 so coupled respectively to spherical sockets 14 and 15 of a piston 4 and swash plate 5 as to be capable of free yawing, and a rod-shaped part 18 for connecting the spherical parts 16 and 17 to each other. In this case, a passage-like hollow part 19 is formed in the rod-shaped part 18 and spherical hollow parts 20 and 21 are respectively formed in the spherical parts 16 and 17. The wall thickness t1 of the rod-shaped part 18 is set to be larger than the wall thickness t2 of respective spherical parts 16 and 17. According to the aforesaid construction, the piston rod 6 can be made light, and durability against a compression load on the swash plate 5 of the rod-shaped part 18 and the piston 4 can be maintained at a good level.

Description

Detailed Description of the Invention A1 Objective of the Invention (1) Industrial Application Field The present invention is directed to a piston 0.7 The present invention relates to a piston rod [-1] comprising a pair of spherical parts that are swingably held on a plate and a piston, respectively, and a rod-shaped part that integrally connects the two spherical parts to each other, and a method for manufacturing the same.

(2) Prior Art Such a piston rod is disclosed in US Pat. No. 4,037, for example.
This is already known, as disclosed in No. 993.

(3) Problems to be Solved by the Invention Conventionally, such piston rods are generally processed by cutting or forging, and therefore are heavy.

Therefore, in order to reduce the weight of the piston, drilling is performed in the center of the piston, but the wall thickness of the spherical part is still thick and the weight reduction results cannot be said to be satisfactory. .

The present invention has been made in view of the above circumstances, and has a primary purpose of providing a piston rod that is lightweight and has high strength, and provides a manufacturing method that can efficiently manufacture such a piston rod. This is the second purpose.

B9 Structure of the invention (1) Means for solving the problem In order to achieve the first object, the present invention forms a spherical hollow part in each spherical part and a passage-like hollow part in a rod-shaped part. , the first feature is that the thickness of the rod-shaped portion is made thicker than the thickness of each spherical portion.

In addition, in order to achieve the second object, the present invention provides a pipe-shaped element +A having a plurality of adjacent piston rod forming areas, in which the wall thickness of the rod-shaped part forming area extending into each piston rod forming area is increased. a molding step of compressing in the radial direction to form a rod-shaped part, and compressing the spherical part molding area in each piston rod molding area in the radial direction with a compression ratio lower than that of the rod-shaped part to mold the spherical part; After the forming step, the second step includes a cutting step of cutting the material between adjacent spherical portions.
The characteristics of

(2) Effect According to the first feature, the weight of the piston rod can be effectively reduced by the passage-like hollow part of the rod-shaped part and the spherical hollow part of the spherical part. Moreover, since the rod-shaped portion is formed thicker than the spherical portion, it can sufficiently withstand the compressive load received between the swash plate and the piston.

According to the second feature, a plurality of piston rods as described in "2" can be obtained at once.

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

First, in FIG. 1 showing a first embodiment of the present invention, a compressor body 1 of a swash plate compressor for a car cooler is provided with a plurality of cylinders 2 arranged around the axis of a drive shaft 3. A piston 4 is housed in 2. These pistons 4 are connected to a swash plate 5 disposed on the back side thereof via a piston rod 6 of the present invention.

The swash plate 5 has a radial bearing 8 and a thrust bearing 9 mounted on a swash plate boulder 7 which is rotationally driven by a drive shaft 3.
．． 10. When the power of an engine (not shown) is transmitted to the drive shaft 3 via the pulley 11 and the swash plate holder 7 is thereby rotated, the swash plate 5 is rotated accordingly.
gives reciprocating motion to the piston 4 via the piston rod 6 while changing its inclination direction, the piston 4 sucks the refrigerant into the cylinder 2 from the flow path 12, and the refrigerant from the flow path 1
It can be discharged to 3.

Next, the piston 6 will be explained with reference to FIGS. 1 and 2.

The piston rod 6 includes a pair of spherical portions 16.17 that are fitted into the spherical sockets 14.15 of the piston 4 and the swash plate 5 so as to be able to swing freely, and a rod-shaped portion that integrally connects the circular spherical portions 16.17. It consists of 18 parts.

The rod-shaped part 18 is formed to have a smaller diameter than the spherical part 16.17. A passage-like hollow part 19 is formed in the rod-shaped part 18, and a spherical hollow part 20.21 is formed in each spherical part 16.17. At this time, the wall thickness t1 of the rod-shaped portion 18 is set to be larger than the wall thickness L2 of each spherical portion 16.17.

The spherical hollow parts 20 and 21 communicate with each other via the passage-like hollow part 19 and with through holes 22 and 23 opening in the outer end surface of each spherical part 1617, respectively. Then,
When the piston rod 6 is attached to the compressor 24, the through hole 2223 on the swash plate 5 side communicates with the oil passage 25 for lubricating the radial hair ring 8, thrust hair rings 9, 10, etc. It goes through.

In such a configuration, when the swash plate 5 changes its inclination direction, the piston rod 6 transmits the thrust from the swash plate 5 to the piston 4 while swinging in the sockets 14 and 15 of the swash plate 5 and the piston 4. .

During this time, lubricant oil supplied to the oil passage 25 from an oil pump (not shown) is supplied not only to the bearings 8, 9 and 10 but also to the sockets 1 and 15 of the swash plate 5.

Further, the oil flows from the through hole 23 to one spherical hollow part 21, then through the passage-like hollow part 19 to the other spherical hollow part 20, and then through the through hole 22 to the socket 1 of the piston 4.
Supplied within 4 days. The oil then seals each socket.
~14.15 Lubricate the circumferential surface of the spherical part 16.17,
Also, each spherical hollow part 20.21 cools the spherical part 16.17.

In particular, since the spherical hollow part 21.22 has a relatively large volume and can hold a large amount of oil, and the spherical part 16.17 has a relatively thin wall, the spherical part 16.17 can be effectively cooled by oil. It will be done. Moreover, since the spherical portions 16, 17 are resistant to compressive loads, even if they are relatively thin, they do not interfere with thrust transmission.

On the other hand, since the rod-shaped portion 18 is formed relatively thick,
It can withstand large compressive loads and reliably transmit thrust.

In this way, each part of the piston rod 6 is given a wall thickness that matches the required strength, so that it is possible to sufficiently reduce the weight while ensuring a predetermined strength.

Next, a method of manufacturing the piston rod 6 will be explained with reference to FIGS. 3 and 4.

First, as shown in FIG. 3, a pipe-shaped metal material 26 that can be plastically worked is prepared. This material 26 is made of the spherical portion 1
A diameter equal to or slightly larger than the outer diameter of 6.17 is selected, and a length corresponding to six piston rods is provided. In this way, the material 26 is provided with a plurality of adjacent piston rond forming areas 30 each consisting of a pair of spherical part forming areas 27 and 28 and one rod-shaped part forming area 29.

Next, the core mold 31 is inserted into the material 26 over its entire length. This core mold 31 has the same diameter as the inner diameter of the rod-shaped portion 18.

After that, the rod-shaped part forming area 2 of each piston rond forming area 30
9 is compressed in the radial direction so as to increase its wall thickness so that its inner surface is brought into close contact with the core mold 31, thereby forming the rod-shaped part 18, and also forming the piston rod forming area 300 and the spherical part forming area 27, 28. is compressed in the semi-radial direction with a compression ratio lower than that of the rod-shaped part 18 to form the spherical part 16.17.

A swaging method is used for such molding.

After the above molding, as shown in FIG.
1 and then cut along the line 32 between adjacent spherical parts 17, 16 to obtain a plurality of piston rods 6.

After cutting, the protrusion 33 remaining on the end face of each piston rod 6 is cut off.

In this way, a plurality of piston rods having different wall thicknesses for the spherical portions 16 and 17 and the rod portion I8 are manufactured at once.

FIG. 5 shows a second embodiment of the present invention, in which each spherical portion 1
The piston rod 6.17 has the same structure as the piston rod 6 of the previous embodiment except that its outer end is closed.
In the figure, parts corresponding to those in the previous embodiment are given the same reference numerals.

The piston rod 6 of this embodiment is used in equipment 6 that does not require lubricating oil to pass through the inside thereof, and the hollow parts 19, 20, 21 in this case are simply hollow parts, so the piston rod 6 is lightweight. can contribute the most to

In manufacturing this piston rod 6, instead of using the core mold 31 as in the previous embodiment, each spherical portion 1 is
6.17 are formed so that the inner surfaces of the material 26 are in close contact with each other at their outer ends, and the other points are the same as the manufacturing method of the previous embodiment.

C1 Effects of the Invention As described above, according to the first feature of the present invention, it is possible to provide a lightweight and strong piston rod, and by using this piston rod, the weight of the reciprocating part of a fluid device is reduced. can improve its performance and durability.

Furthermore, according to the second feature of the present invention, a plurality of the piston rods can be manufactured at once, which allows for excellent mass productivity and contributes to cost reduction.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a swash plate compressor equipped with screws 1 to 1 of the first embodiment of the present invention, Fig. 2 is an enlarged longitudinal cross-sectional view of the piston rod, and Figs. 3 and 4 are the above-mentioned piston rods. 3 is an explanatory diagram of the forming process, FIG. 4 is an explanatory diagram of the cutting process, and FIG. 5 is a longitudinal sectional view of a piston rod showing a second embodiment of the present invention. FIG. 6 is a diagram corresponding to FIG. 3 showing the manufacturing method thereof. 4... Piston, 5... Swash plate, 6... Piston rod, 16.17... Spherical part, 18... Rod-shaped part, 1
9...Hollow part, 20.21...Spherical hollow part, 24.
...Compressor, 26...Pipe-shaped metal material, 27.28
... Spherical part forming area, 29... Bar-shaped part forming area, 30.
...Piston rod forming area 3 JP-A-3 9083 (6) JP-A-3 9083 (7)

Claims (2)

[Claims] (1) In a piston rod for a swash plate type fluid device, which consists of a pair of spherical parts that swingably engage the swash plate and the piston, and a rod part that integrally connects the two spherical parts, each spherical part A piston rod for a swash plate type fluid device, characterized in that a spherical hollow part is formed and a passage-like hollow part is formed in the rod-shaped part, and the thickness of the rod-shaped part is made thicker than the thickness of each spherical part. (2) A method for manufacturing a piston rod for a swash plate type fluid device according to item (1), comprising: a rod-shaped part forming area in each piston rod forming area of a pipe-shaped material having a plurality of adjacent piston rod forming areas; is compressed in the radial direction to increase the wall thickness to form a rod-shaped part, and the spherical part molding area in each piston rod molding area is compressed in the radial direction with a compression ratio lower than that of the rod-shaped part to form a spherical part. 1. A method for manufacturing a piston rod for a swash plate type fluid device, the method comprising: a molding step of molding a piston rod; and a cutting step of cutting the material between adjacent spherical portions after the molding step.