JPH01247708A - Lubricating oil feeding structure for variable displacement type reciprocating piston device - Google Patents

Abstract

PURPOSE:To improve lubricating efficiency by making an oil hole of a main shaft and an oil hole of an intermediate section member communicate with each other via an oil groove which is provided on a slider, in a device which has the intermediate section member that has a pin part for connecting a connecting rod and the main shafts that are connected to both end sides of the intermediate section member via sliders. CONSTITUTION:An intermediate section member 1, which corresponds to an intermediate section of an Oldam's coupling, is composed of a pin part 2 with which a big end part of a connecting rod 8 is connected and a pair of disk parts 3, 4 that are formed to both end surfaces of the pin part 2. Guiding grooves 5, 6 which extend in the direction of rectangularly crossing with each other are formed on surfaces of the respective disk parts 3, 4. The first and the second main shafts 11, 26 are provided on the disk parts 3, 4 sides of the intermediate section member 1. The respective main shafts 11, 26 are composed of disk parts 12, 17, which slidingly touch the respective disk parts 3, 4 via sliders 16, 31 that are slidably engaged with the respective guiding grooves 5, 6, and shaft parts 13, 28. And oil holes 15, 9, which are formed to the first main shaft 11 and the intermediate section member 1, are communicated with each other by an oil groove 18 that is formed on the slider 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a variable displacement reciprocating piston device used as a reciprocating internal combustion engine or a reciprocating compressor, and particularly to its lubricating oil supply structure.

Conventional technology In a reciprocating piston device using a general rank shaft, the reciprocating stroke of the piston is fixedly determined only by the amount of eccentricity of the crank pin in the crankshaft, and the capacity of the piston device, that is, the internal combustion engine. It is not possible to change the displacement amount or the discharge amount as a compressor.

Therefore, the present applicant has previously proposed a variable displacement type 1 reciprocating piston device in which the displacement can be arbitrarily changed by changing the reciprocating stroke of the piston (Japanese Patent Application No. 1982-234026).

This includes an intermediate node member corresponding to the intermediate node of a so-called Oldham joint, a first main shaft corresponding to one node of the Oldham joint and having a fixed rotation center, and a rotating member corresponding to the other node; The second main shaft C is movable in a direction perpendicular to the axis, and a piston is connected to the pin portion of the intermediate joint member via a connecting rod. In this configuration, the pin portion is the first. Since it moves along a revolution circle whose diameter is the distance between the rotation centers of the second principal axes, by moving the rotation centers of the second principal axes,
This allows the reciprocating stroke of the piston and thus the capacity to be changed.

Problems to be Solved by the Invention By the way, in reciprocating piston devices such as internal combustion engines that use a general crankshaft, lubricating oil is supplied to the crank bottle through an oil hole formed in the crankshaft, and the connecting rod The space between the large end and the large end is lubricated.

However, as mentioned above, the first. In a variable displacement reciprocating piston device that is divided into a second main shaft and an intermediate joint member, the first main shaft and the intermediate joint member always move relative to each other, so even if an oil hole is simply formed, the first Lubricating oil cannot be supplied from the main shaft side to the pin part. In particular, if a large amount of lubricating oil leaks from joint surfaces that move relative to each other, the pressure drop will be significant, making it impossible to provide sufficient lubrication.

Therefore, an object of the present invention is to provide a lubricating oil supply structure suitable for the above-mentioned variable displacement reciprocating piston device.

Means for Solving the Problems A lubricating oil supply structure for a variable displacement reciprocating piston device according to the present invention includes: an intermediate node member having a pin portion connected to a reciprocating piston via a connecting rod; and the intermediate node member. a first main shaft that is in close contact with one end surface of the intermediate section member and whose center of rotation is fixed; a second main shaft that is in close contact with the other end surface of the intermediate section member and whose center of rotation is movable;
A first slider and a first guide groove that fit into each other are provided on the joint surface of the intermediate section member and the first main shaft, and a first slider and a first guide groove that are provided on the joint surface of the intermediate section member and the second main shaft along a direction perpendicular to these. In the variable displacement heavy reciprocating piston device, the first slider is formed separately from the first main shaft or the intermediate section member, and the first slider is formed separately from the first main shaft or the intermediate section member, and the second slider and the second guide groove are fitted into each other. The top surface is brought into pressure contact with the bottom surface of the first guide groove by a spring disposed in the slider, and an oil groove is formed along the longitudinal direction on the top surface of the first slider, so that the center portion of the first spindle and the center portion of the intermediate section member are connected to each other. It is characterized in that the respective formed oil holes are communicated with each other through the oil groove.

A first slider is provided on one side of the joint surface between the first main shaft, which has a fixed center of rotation, and the intermediate node member, and a first guide groove is provided on the other side. It is formed separately from the first main shaft or the intermediate node member.

The first slider is biased by a spring so that its top surface is always in close contact with the bottom surface of the first guide groove. The oil groove formed in the first slider always communicates with the oil hole opened at the bottom of the guide groove.
The oil hole on the main shaft side and the oil hole on the intermediate joint member side communicate with each other to supply lubrication to the pin portion.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 show the main parts of a variable displacement reciprocating piston device according to the present invention, and show only the configuration of the -cylinder section.

In the figure, ■ is an intermediate joint member corresponding to the intermediate joint in a so-called Oldham joint, and this intermediate joint member l consists of a short cylindrical pin part 2 and a pair of disks formed on both end surfaces of this pin part 2. It consists of Section 3.4. Said disk part 3
．． 4 has a first guide groove 5.4 along the radial direction. Second
Guide grooves 6 are respectively recessed. These first guide grooves 5 and second guide grooves 6 have a rectangular cross section and are provided along directions perpendicular to each other. The pin portion 2 corresponds to a crank pin in a general crankshaft, and is connected to a large end portion of a connecting rod 8 having a piston 7 at one end. Further, an oil hole 9 is formed through the pin portion 2 along its center line, and an oil hole 10 is formed in the radial direction branching from the oil hole 9. Both ends 9a and 9b of the oil hole 9 are connected to the first guide groove 5° and the second guide groove, respectively.
It opens at the center of the bottom surface of the guide WIt6.

Next, reference numeral 11 indicates a first main axis corresponding to one node of the Oldham joint. This first main shaft 11 has a disk portion 12 that is in close contact with the surface of the disk portion 3 of the intermediate node member l, and this disk portion! 2, and a slider mounting 4 along the radial direction on the surface of the disc part 12.
14 is recessed. An oil hole 15 is formed to penetrate along the center of the first main shaft 11, and one end 1.5a of the oil hole 15 opens at the center of the slider mounting WIt14. Reference numeral 16 denotes a first slider that is fitted into and attached to the slider attachment groove 14, and this first slider 16 has stopper portions 17 bent at both ends. Movement of the disk portion 12 in the radial direction is prevented. In other words, the first slider 16
is slightly movable only in the axial direction of the first main shaft If. The first slider I6 is the intermediate section member! The first guide groove 5 of the first guide groove 5 is fitted to restrict the relative movement between the two in one direction.

Further, an oil groove 18 is recessed in the center of the top surface 16a of the first slider t6 along its longitudinal direction. This oil groove 18 can communicate with the oil hole 15 of the first main shaft 11 via an oil hole 19 formed through the center. A pair of coil springs 20 are disposed on the back surface of the first slider 16, and are biased so that the top surface 16a of the first slider 16 comes into pressure contact with the bottom surface of the first guide groove 5. It has become. Also, on the back side of the first slider 16, there are an oil hole 19 of the first slider 16 and a first main shaft I! An annular seal member 21 made of an elastic body is provided to seal between the oil hole 15 and the oil hole 15 .

The shaft portion 13 of the first main shaft 11 is connected to the cylinder block 22
It is rotatably supported by a fixed bearing 23 provided in the. That is, the rotation center of the first main shaft 2 is fixed. Also, facing the end of the shaft portion 13,
A lubricating oil chamber 25 separated by an oil seal 24 is provided in a part of the cylinder block 22. This lubricating oil chamber 25 communicates with an oil pump discharge side (not shown).

Therefore, from this lubricating oil chamber 25 to the oil hole 15 of the first main shaft 11.
Pressurized lubricating oil is supplied to the

Further, 26 indicates a second main shaft corresponding to the other node of the Oldham joint. This second main shaft 26 has substantially the same configuration as the first main shaft 11 described above, and is composed of a disk portion 27 that is in close contact with the disk portion 4 of the intermediate node member l, and a shaft portion 28 formed on the back surface of the disk portion 27. , and a slider mounting groove 29 is recessed in the surface of the disk portion 27 along the radial direction. The slider mounting groove 29 includes a second slider 3 having stopper portions 32 at both ends! are fitted and installed. The second slider 31 fits into the second guide groove 6 of the intermediate node member l, and also restricts the direction of relative movement between the two to one direction. Further, the second slider 31 has an oil groove 33 formed in its top surface along the longitudinal direction, and an oil hole 33 in the center.
4 is formed through the hole. A pair of coil springs 35 and a seal member 36 are disposed on the back surface of the second slider 31, similar to the first slider I6 described above, and the top surface of the second slider 31 is connected to the second guide groove. 6
It is pressed against the bottom of the

An oil hole 37 is formed along the center line of the second main shaft 26, and a pair of oil holes 38 and 39 are formed in the radial direction branching from this. Above oil hole 37
One end 37a is open at the center of the slider mounting groove 29, and the other end 37b is closed.

The shaft portion 28 of the second main shaft 26 is rotatably supported by a movable bearing 40 . The movable bearing 40 is configured to be movable in the vertical direction by a guide mechanism (not shown). That is, the rotation center of the second main shaft 26 is movable along the direction perpendicular to the axis. In addition, the second main shaft 26
The rotation center is located below the fixed rotation center of the first main shaft 11, and as the movable bearing 40 moves upward, the inner rotation center approaches.

Therefore, in the above configuration, the first main shaft 11, the second main shaft 26, and the intermediate joint member l rotate in exactly the same phase, and the pin portion 2 of the intermediate joint member l rotates in the first main shaft 11, the second main shaft 26, and the intermediate joint member l. 2nd spindle 1
It revolves along a revolution circle whose diameter is the line segment connecting the rotation centers of 1.26. Then, the second
If the center of rotation of the main shaft 26 is moved closer to or further away from the center of rotation of the first main shaft It, the diameter of the above-mentioned revolution circle will change, and the reciprocating stroke of the piston 7 and the volume of the piston device will change. be.

Here, the lubricating oil that has been pressure-fed to the lubricating oil chamber 25 first enters the oil hole 15 of the first main shaft 11 and the first slider! The oil flows into the oil groove 18 through the oil hole 19 of No.6.

The oil groove 18 always communicates with the end 9a of the oil hole 9 of the intermediate joint member l regardless of the relative position between the first slider 16 and the first guide groove 5, so the lubricating oil flows from here. It flows into the oil hole 9. A portion of the lubricating oil that has flowed into the oil hole 9 is supplied to the outer circumferential surface of the bottle portion 2 through the oil hole 10 and lubricates the space between the bottle portion 2 and the connecting rod 8 . A part of the lubricating oil passes through the oil hole 9, flows into the oil groove 33 on the top surface of the second slider 31, and from there passes through the oil hole 34 into the second slider 31.
The oil flows into the oil hole 37 of the main shaft 26. The lubricating oil that has flowed into the oil hole 37 further flows in the radial direction through the oil holes 38 and 39 and is supplied between the shaft portion 28 and the movable bearing 40. still,
In the illustrated example, the fixed bearing 23 of the first main shaft 11 is lubricated via a lubricating oil passage 41 formed in the cylinder block 22, but an oil hole is formed branching from the oil hole 15 in the radial direction. Alternatively, the lubricating oil can be supplied from the inner peripheral side.

Thus, according to the above configuration, the first. Second spindle 11.2
6 and the intermediate joint member 1, the lubricating oil is applied from the first main shaft 11 side, where the rotation center is fixed, to the pin part 2 and the second main shaft 11.
It can be supplied to the main shaft 26. Therefore, the large end of the connecting rod 8 and the movable bearing 40 can be reliably lubricated from the inner peripheral side. In particular, in the above configuration, the top surfaces of the first slider 16 and the second slider 31 are the same as the first slider 16 and the second slider 31. Since the lubricating oil is kept in close contact with the bottom surface of the second guide groove 5.6, the amount of lubricating oil leaking is extremely small, and it is possible to supply the lubricating oil to each part while maintaining sufficient oil pressure. Moreover, the seal member 21.3
6 is arranged, there is no sliding at all,
Since it is only subjected to a slight displacement in the axial direction, problems such as wear will not occur.

In the above embodiment, lubricating oil is further supplied from the pin part 2 to the second main shaft 26 side to lubricate the movable bearing 40. It may also be configured to lubricate from the outside.

Further, in the above embodiment, the lubricating oil chamber 25 is provided opposite to the end of the first main shaft ti, but as shown in FIG. It may be configured to introduce lubricating oil into the hole 15. That is,
In this embodiment, an oil hole 42 is formed in the shaft portion 13 of the first main shaft 11 in the radial direction, and the lubricating oil supplied through the fixed bearing 23 is passed through the oil hole 42 to the oil in the center. Hole 1
5.

Furthermore, in the above embodiment, the first and second
The guide groove 5.6 is recessed, and the first main shaft 11° and the second main shaft 26
to the first slider 16. Although the second slider 31 is provided, this relationship can be changed as appropriate.

Effects of the Invention As is clear from the above explanation, according to the lubricating oil supply structure of the variable displacement reciprocating piston device according to the present invention, the inside of the first main shaft and the intermediate joint member is Lubricating oil can be supplied to the pin portion through the oil hole, and the space between the pin portion and the connecting rod big end portion can be reliably lubricated from the inner peripheral side. In particular, the amount of lubricating oil leaking at the sliding contact between the first main shaft and the intermediate joint member can be reduced, and the number of times the lubricating oil is supplied to the pin portion while maintaining a high oil pressure can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the main parts of a variable displacement reciprocating piston device equipped with a lubricating oil supply structure according to the present invention, Fig. 2 is a sectional view thereof, and Fig. 3 shows lubricating oil introduced from the fixed bearing part. FIG. l... Intermediate joint member, 2... Bin part, 5... First guide groove, 6... Second guide groove, 7... Piston, 8
...Connecting rod, 9...Oil hole, 11...
・First main shaft, 15... Oil hole, 16... First slider, I8... Oil groove, 20... Coil spring, 26
...Second main axis, 31...Second slider. Figure 3

Claims (1)

[Claims] (1) an intermediate section member having a pin portion connected to a reciprocating piston via a connecting rod; a first main shaft that is in close contact with one end surface of the intermediate section member and whose center of rotation is fixed; a second main shaft that is in close contact with the other end surface of the intermediate section member and whose center of rotation is movable; a first slider that fits together and that is provided on the joint surface of the intermediate section member and the first main shaft; A variable displacement reciprocating piston comprising a guide groove, and a second slider and a second guide groove that fit into each other and are provided on a joint surface between an intermediate node member and a second main shaft along a direction perpendicular to these. In the apparatus, the first slider is formed separately from the first main shaft or the intermediate section member, and the top surface is brought into pressure contact with the bottom surface of the first guide groove by a spring disposed on the back surface, and the first slider is
A variable capacity variable capacity characterized in that an oil groove is formed along the longitudinal direction on the top surface of the slider, and oil holes formed at the center of the first main shaft and the center of the intermediate section member are communicated with each other through the oil groove. Lubricating oil supply structure for type reciprocating piston device.