JPH0146719B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a so-called rotating swash plate type drive device that converts rotational motion into linear motion or linear motion into rotational motion. be.

(Prior Art) In a rotating swash plate type drive device, it is required to reduce the friction between the swash plate and the piston. Conventionally, for example, in the device disclosed in Japanese Patent Publication No. 53-521, an intermediate plate is interposed between the piston and the swash plate, and the swash plate side contact end surface of the intermediate plate or the intermediate plate contact end surface of the swash plate is is formed into a conical shape with a large apex angle to eliminate relative slip between the piston and the intermediate plate where the surface pressure is high, and to allow relative slip between the intermediate plate and the swash plate where the surface pressure is low.

(Problems to be Solved by the Invention) In the conventional device described above, there is line contact between the piston and the intermediate plate and between the intermediate plate and the swash plate, and the contact end surface of the intermediate plate on the swash plate side or the middle of the swash plate The plate contact end surface is formed into a conical shape with a large apex angle, so that the surface pressure between the intermediate plate and the swash plate is smaller than that between the intermediate plate and the piston, and only between the intermediate plate and the swash plate where the surface pressure is small. I'm trying to slide it. Therefore, in the conventional device described above, the piston and the intermediate plate do not slide due to the large surface pressure, but slide only between the intermediate plate and the swash plate where the surface pressure is small, so the sliding between the piston and the swash plate does not occur. The dynamic speed is not divided by the intermediate plate,
The frictional resistance between the piston and the swash plate is large, and the frictional heat due to the frictional resistance is also high. As a result, seizure and abnormal wear of the sliding surface occur, resulting in a problem that the mechanical efficiency and durability of the rotating swash plate type drive device are reduced.

In addition, in the conventional device described above, there is line contact between the piston and the intermediate plate, and between the intermediate plate and the swash plate, so the surface pressure between both is large and the load acting on the piston is low. Even if it is possible to use this method, when it is used for a high-load object such as the drive section and output take-off section of a Stirling cycle, the surface pressure at the line contact portion becomes extremely large. As a result, the oil film cannot be maintained at the line contact portion, causing problems such as an increase in frictional resistance.

Therefore, the present invention has been developed so that the rotary swash plate type drive device can be used in devices where a large load acts between the piston and the rotary swash plate, such as a Stirling cycle drive unit and an output take-out unit. The technical objective is to reduce the frictional resistance between the swash plates while reducing the surface pressure between them.

〔Effect of the invention〕

(Means for solving the problem) The means taken to solve the above technical problem is that the shaft is integrally connected at a predetermined angle to a shaft rotatably supported within the case body. A rotary swash plate that rotates integrally with the compression piston is connected to a piston that can reciprocate within the case, and the piston is reciprocatably inserted into the compression cylinder to form a variable volume space on both sides of the compression piston. In a rotary swash plate type drive device connected via a drive rod, a sliding member is provided that is slidably engaged with the piston and causes the piston to reciprocate by the rotary swash plate, and the sliding member and the rotation A floating disk that can slide in surface contact between the swash plates and has a sliding surface area with the rotating swash plate that is larger than the sliding surface area of the sliding member, and further includes a floating disk that is slidable in surface contact with the rotating swash plate; An oil hole for supplying oil between the floating disk and the floating disk and between the floating disk and the sliding member is formed in the rotating swash plate and the shaft.

(Function) According to the above means, a floating disk is interposed between the sliding member and the rotating swash plate, and an oil hole is provided between the rotating swash plate and the floating disk and between the floating disk and the sliding member. By constantly forming a good lubricating film with the supplied oil, the coefficient of friction between the rotating swash plate and the floating disk and the coefficient of friction between the floating disk and the sliding member are almost the same, and the sliding The relative speed between the member and the rotating swash plate is approximately divided into two: the relative speed between the sliding member and the floating disk, and the relative speed between the rotating swash plate and the floating disk.
Therefore, the frictional heat, that is, the frictional resistance between the sliding member and the rotating swash plate can be reduced, seizure and abnormal wear of the sliding surface can be eliminated, and the mechanical efficiency and durability of the rotating swash plate type drive device can be improved.

At the same time, the floating disk interposed between the sliding member and the rotating swash plate is capable of sliding in surface contact with the sliding member and the rotating swash plate, and the sliding surface area with the rotating swash plate is larger than that of the sliding member. It is larger than the sliding surface area, and the rotating swash plate has an oil hole that supplies oil between the rotating swash plate and the floating disk, so the oil supplied from the oil hole always provides good performance. While maintaining a lubricating film to reduce frictional resistance, when the surface pressure between the sliding member and the floating disk is transmitted to the rotating swash plate, it is dispersed by the floating disk, reducing the surface pressure between the rotating swash plate and the sliding member. can be reduced. This results in a large load acting between the piston and the rotating swash plate (between the sliding member and the rotating swash plate), such as in the Stirling cycle (including when used as a prime mover and when used as a refrigerator). It can also be used for things.

(Example) Hereinafter, one example of the present invention will be described based on the accompanying drawings.

Inside the case body 1, a shaft 3 connected to the rotating swash plate 2 is rotatably supported by thrust bearings 4, 5 and radial bearings 6, 7. The piston 9 is provided with two opposing spherical recesses 9a, and a hemispherical sliding member 1 is disposed in each spherical recess 9a.
Further, between the sliding members 10, 11 and the rotating swash plate 2, annular floating disks 12, 13 are provided which can slide on the A side or the B side, respectively. Although not shown in the drawings, the floating disk 12,1
It is also possible to stack two or more pieces of 3. The oil hole 14 provided in the rotating swash plate 2 and the oil holes 17 and 18 provided perpendicularly to the shaft 3 are connected to the oil pump 8 through an oil hole 15 formed in the center of the shaft 3. It communicates with the discharge port 16.

Reference numeral 20 denotes a compression portion operated by the rotary swash plate mechanism of the present invention, in which a compression piston 22 sliding within a compression cylinder 21 is connected to the piston 9 by a drive rod 23. Suction valves 26 and 27 and discharge valves 28 and 29 are provided in variable volume spaces 24 and 25 surrounded by compression cylinder 21 and compression piston 22, respectively.

Another variant embodiment shown in FIG.
2, 13 and the rotating disk 2, roller bearings 19, 1
9' is provided.

Although each embodiment of the present invention has been described using a compressor, it is also possible to apply the present invention to a drive unit such as a pump, a Stirling heat engine, or a Stirling refrigerator.

Next, the operation of the rotating swash plate mechanism of the present invention will be explained based on FIG. By an electric motor (not shown),
When the shaft 3 and the rotating swash plate 2 connected to the shaft 3 rotate together, a sliding floating disk 12,1 is formed.
3 and sliding members 10 and 11, the piston 9
performs a reciprocating motion. In this case, between the rotating swash plate 2 and the floating disks 12 and 13 (side B), oil is sucked and pressurized and discharged by the oil pump 8, and is supplied through the discharge port 16 and oil holes 15 and 14. The floating discs 12, 13 and the sliding members 10, 1
1 (surface A), a fluid lubricant film is formed by the lubricating oil splashed and supplied by the thrust bearings 4 and 5 through the oil holes 17 and 18, thereby making it possible to slide.
The sliding on the A side and the B side will be more if the coefficient of friction is smaller, but in this example, a fluid lubricating film is formed by the lubricating oil on both the A side and the B side. Therefore, the coefficient of friction on both sides is approximately the same, and the sliding motion on the A side and the B side is approximately the same. Due to the reciprocating movement of the piston 9, the drive rod 2
Compression piston 2 connected to piston 9 via 3
2 reciprocates and acts as a compressor 20, but since the operation of the compressor 20 is well known, it will not be described in detail here.

In the modified embodiment shown in FIG.
9 and 19' ensure smooth sliding.

According to the present invention, by providing the floating disks 12 and 13 between the rotating swash plate 2 and the sliding members 10 and 11, there are four sliding surfaces on the piston 9 side (between the sliding member 10 and the floating disk 12). between the sliding member 11 and the floating disc 13, between the floating disc 12 and the rotating swash plate 2, and between the floating disc 13 and the rotating swash plate 2), and the rotating swash plate 2 and the sliding member 10, The relative velocity V between the rotating swash plate 2 and the floating discs 12 and 13 is divided into the relative velocity between the floating discs 12 and 13 and the sliding members 10 and 11, and the relative velocity V between the floating discs 12 and 13 is divided into approximately 1/2. becomes possible. It is known that the frictional heat generated on the sliding surface is proportional to the square of the circumferential speed, but by dividing the relative speed V according to the present invention, it is possible to reduce the frictional heat, that is, the frictional resistance. This eliminates seizure and abnormal wear on the sliding surface, and significantly improves the mechanical efficiency and durability of the rotating swash plate mechanism.

Further, according to the present invention, since the sliding surface area of the floating disks 12 and 13 is sufficiently larger than that of the sliding members 10 and 11, the floating disks 12 and 13 and the B surface of the rotating swash plate 2 The surface pressure P ₁ generated on the sliding member 10,
11 and the floating disks 12 and 13, which is smaller than the surface pressure _P2 acting on the A side, and therefore a fluid lubricant film is maintained on the B side, allowing smooth sliding on the B side. Here, the reason why the contact pressure P ₁ generated on the B side is smaller than the contact pressure P ₂ generated on the A side is shown mechanically.
It will look like this:

Letting the force F acting on the sliding member 11 and the diameter of the sliding member 11 be Da, the area Sa of the A surface is Sa=πDa ² /4. Therefore, the contact pressure P ₂ on the A side is P ₂ =F/Sa.

On the other hand, the inner diameter and outer diameter of the floating disk 12 are respectively Di
and Do, the area Sb of the B surface is Sb=π(Do ² −Di ² )/4. Therefore, the contact pressure P ₁ on the B side is P ₁ =F/Sb.

To know the magnitude of P ₁ and P ₂ , divide the former by the latter: P ₁ / P ₂ = F / Sa / F / Sb = Sb / Sa = π (Do ² − Di ² ) / 4/πDa ² /4.

Therefore, since Do ² − Di ² > Da ² , P ₁ > P ₂
becomes. In other words, the surface pressure P ₁ on surface B is the surface pressure P ₂ on surface A.
becomes smaller than

As described above, the rotating swash plate mechanism of the present invention makes it possible to significantly reduce the PV value of the substantially lubricated portion, resulting in improved mechanical efficiency and durability.

〔Effect of the invention〕

According to the present invention, a floating disk is interposed between the sliding member and the rotating swash plate, and oil is supplied from the oil hole between the rotating swash plate and the floating disk and between the floating disk and the sliding member. As a result, the coefficient of friction between the rotating swash plate and the floating disk and the friction coefficient between the floating disk and the sliding member are almost the same, and the friction coefficient between the sliding member and the rotating swash plate is approximately the same. The relative speed between the plates is divided into approximately 1/2 of the relative speed between the sliding member and the floating disk and the relative speed between the rotating swash plate and the floating disk. Therefore, it is possible to reduce the frictional heat, that is, the frictional resistance between the sliding member and the rotating swash plate, eliminating seizure and abnormal wear on the sliding surface, and significantly improving the mechanical efficiency and durability of the rotating swash plate type drive device. .

Further, according to the present invention, the floating disk interposed between the sliding member and the rotating swash plate is capable of sliding in surface contact with the sliding member and the rotating swash plate, and has a sliding surface area with the rotating swash plate. is larger than the sliding surface area of the sliding member, and the rotating swash plate has an oil hole that supplies oil between the rotating swash plate and the floating disk, so oil is supplied from the oil hole. Oil always maintains a good lubricating film to reduce frictional resistance, and when the surface pressure between the sliding member and the floating disk is transmitted to the rotating swash plate, it is dispersed by the floating disk, and the surface pressure between the rotating swash plate and the sliding member is dispersed. It can reduce the surface pressure between. This results in a large load acting between the piston and the rotating swash plate (between the sliding member and the rotating swash plate), such as in the Stirling cycle (including when used as a prime mover and when used as a refrigerator). It can also be used for things.
Furthermore, according to the present invention, by being able to reduce the frictional heat between the sliding member and the rotating swash plate, deterioration of the lubricating oil due to heat generation can be eliminated, and it is possible to reduce the size and weight of the lubricating oil radiator, etc. can.

[Brief explanation of drawings]

FIG. 1 is a central sectional view showing an embodiment of a rotary swash plate type drive device according to the present invention, FIG. 2 is a sectional view showing a modified embodiment of the main part, and FIG. It is a front view of a disc. 1...Case body, 2...Rotating swash plate, 3...
Shaft, 9... piston, 10, 11... sliding member,
12, 13...Floating disc, 14...Oil hole, 21...
...Compression cylinder, 22...Compression piston, 23...
...Drive rod.

Claims (1)

[Claims] 1. A rotating swash plate that is integrally connected at a predetermined angle to a shaft rotatably supported within the case body and rotates integrally with the shaft is connected to a piston that can reciprocate within the case, and the piston In a rotary swash plate type drive device, a rotary swash plate type drive device is connected via a drive rod to a compression piston that is reciprocatably inserted into a compression cylinder and forms a variable volume space on both sides of the compression cylinder, and is slidable on the piston. A sliding member is provided that is engaged to cause the piston to reciprocate by the rotating swash plate, and is slidable in surface contact between the sliding member and the rotating swash plate, and has a sliding surface area with the rotating swash plate. interposes a floating disk whose surface area is larger than the sliding surface area of the sliding member, and further supplies oil between the rotating swash plate and the floating disk and between the floating disk and the sliding member. A rotating swash plate type drive device, characterized in that oil holes are formed in the rotating swash plate and the shaft.