JPH0520593B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention connects a wobble plate swingably mounted on a drive shaft and a piston fitted into a cylinder bore so as to be movable forward and backward, using a connecting rod. A oscillating swash plate type compressor is installed to obtain compression by moving a piston forward and backward through the oscillation of the wobble plate, and a connecting rod is rotated in a universal direction relative to the wobble plate or piston. It relates to a method of movably connecting, more specifically between a wobble plate and a cooking rod,
Alternatively, the present invention relates to an improvement in a method of connecting a piston and a connecting rod by caulking to minimize rattling in the connecting portion.

[Conventional technology]

In general, in a wobble plate type compressor, a wobble plate is mounted on the drive shaft so that it can swing freely while its rotation is restricted, while a piston is installed in the cylinder bore bored in the cylinder block. is inserted so that it can move forward and backward. The wobble plate and the piston are rotatably connected in the universal direction by a connecting rod, and are provided so that the swinging motion of the wobble plate can be transmitted to the piston via the connecting rod. That is, it is provided so that a compression action is obtained by moving the piston forward and backward through the rocking of the wobble plate.

Conventionally, in the above-mentioned oscillating swash plate type compressor, as one method for connecting both ends of the connecting rod to the wobble plate and the piston so as to be rotatable in the universal direction, one method is shown in FIGS. 8 to 10. As shown in the figure, the wobble plate 21 and piston 1
On the 6th side, spherical recesses 28, 28 are formed corresponding to the spherical surfaces of the ball parts 22a, 22a formed at both ends of the connecting rod 22, respectively.
With the ball portions 22a, 22a engaged with the ball portions 28, the caulking cylinder portions 29, 29 rising from the opening edges of the spherical recesses 28, 28 are inserted along the spherical surfaces of the ball portions 22a, 22a. A method of connecting by bending and deforming the connecting rod 22 to the wobble plate 21 and the piston 16.
A method has been proposed in which the ball portions 22a, 22a are connected by caulking (Japanese Patent Laid-Open No. 57-33286, Japanese Patent Publication No. 58-53198).

[Problem that the invention seeks to solve]

However, in the conventional crimping method as described above, during crimping, the side of the wobble plate and the crimped cylinder of the piston that is in contact with the ball part of the conrod is contracted, and the side that does not come into contact with the ball part is contracted. There is a problem in that when the side is stretched, a spring back occurs in the caulking cylinder part, and the tip side of the caulking cylinder part opens. And as the tip side of the caulking cylinder part opens like this,
If the gripping force of the ball section by the caulking tube section becomes weak and looseness occurs, and force is applied to the wobble plate and piston in the direction of pulling the connecting rod (the direction in which the connecting rod comes out), the ball section will The ball portion will float above the bottom of the spherical recess and come into line contact with the caulking cylinder portion. As shown in Fig. 10, when a tensile force R is applied to the wobble plate and piston in the direction of pulling the conrod (the direction in which the conrod comes out), a reaction force is generated in the opposite direction to the tensile force R. When the reaction force R' is decomposed into a normal component N ₁ and a tangential component N ₂ , N ₁ = R'sinθ N ₂ = R'cosθ 0<θ<π/2. , the force with which the caulking cylinder presses down on the stove rod is represented by _N1 .

The present invention is an attempt to improve the problem in order to solve the above-mentioned problems.The present invention is an attempt to improve the above-mentioned problems. )
The problem to be solved lies in the ability to prevent the occurrence of rattling. The present invention achieves the above-mentioned θ by caulking the two surfaces of the tip side spherical surface and the base side spherical surface of the ball portion by bringing them into surface contact, that is, by caulking the base side of the ball portion with the caulking cylinder portion. increase the value
It is characterized by increasing N ₁ (the force with which the caulking cylinder part presses down the cooking stove), and the specific means thereof are as follows.

[Means for solving problems]

A spherical concave portion is bored in each or either one of the wobble plate, which is mounted on the drive shaft so that it can swing freely with rotation restricted, and the piston, which is inserted into the cylinder bore so that it can move forward and backward. A spherical surface on the tip end side of a ball portion integrally formed at the end of the connecting rod is fitted into the recess so as to be rotatable in a universal direction, and a caulking cylinder portion is integrally formed upright from the opening edge of the spherical recess, In a rocking swash plate type compressor in which the caulking cylinder part is deformed by caulking and is caulked to the ball part, the caulking cylinder part and the opening of the spherical recess are formed such that a step is formed between the opening part and the opening part. It is formed in an upright manner with a diameter slightly larger than the diameter of the

When deforming the caulking tube by caulking, the caulking tube forms a space between the rising base and the ball portion via the stepped portion, and gradually moves from the base toward the distal end. 〓It extends so as to approach the ball portion while narrowing the gap, and its tip portion makes surface contact with the spherical surface on the base side of the ball portion. That is, a space is provided between the ball part and the ball part to be supported by two surfaces, a spherical surface on the base side and a spherical surface on the distal end side.

〔Example〕

Specific embodiments of the present invention will be described below with reference to illustrative drawings.

Each of the drawings in FIGS. 1 to 4 shows a first embodiment, and numeral 1 indicates a housing forming the outer shell of the compressor. The housing 1 consists of a front housing 1F, a rear housing 1R, and a cylinder block 2, and is formed by fastening these parts together with a plurality of through bolts 3. That is, a plurality of through bolts 3 are inserted at a constant angle of deviation from the outer peripheral edge of the front housing 1F, and the threaded portion formed at the tip thereof is screwed into the rear housing 1R through the cylinder block 2. The through bolts 3 located at the bottom of the plurality of through bolts 3 are provided also as a guide for preventing rotation of the wobble plate 21, as will be described later. A crank chamber 17 is formed in the front housing 1F, and a drive shaft 4, which will be described later, is located in the center of the crank chamber 17.
The rear housing 1R is provided with a bearing portion 5A, and a suction chamber 6 and a discharge chamber 7.
are provided concentrically through an annular partition wall 8.
That is, the discharge chamber 7 is located at the center, and the suction chamber 6 is located near the outer periphery so as to surround the discharge chamber 7.
More specifically, both chambers 6 and 7 are provided so as to communicate with compression chambers 15 of a cylinder bore 14, which will be described later, via an inlet 9 and an outlet 10 opening in the valve plate 11. A suction valve 12 is provided at the suction port 9 so as to open and close during the suction stroke of the piston 16, which will be described later, and a discharge valve 13 is also provided at the discharge port 10 so as to open and close during the compression stroke of the piston 16. It will be done.

A bearing part 5B is provided in the center of the cylinder block 2, facing the bearing part 5A, and a plurality of cylinder bores 14 are provided at one end of the cylinder block 2 on its outer circumference with the bearing part 5B as the center. is bored in communication with the crank chamber 17. Each cylinder bore 14 has a compression chamber 15 on the rear side, into which a piston 16 is fitted so as to be able to move forward and backward. It is provided so that selective communication can be made between the two.

On the other hand, in the crank chamber 17, both the bearing portions 5 are provided.
A drive shaft 4 is supported horizontally between A and 5B. A lug plate 18 is mounted on one end of the front side of the drive shaft 4 so as to be rotatable together with the drive shaft 4, and a drive plate 20 formed in an annular shape so as to surround the drive shaft 4 is attached to the lug plate 18. It is swingably supported along the longitudinal direction of the drive shaft 4. The drive plate 20 is the lug plate 1
8, and a small diameter disc part 20B formed in the center of the large diameter disc part 20A to face the cylinder block 2. , a radial bearing 27 is interposed between the drive plate 20 and the small diameter disc part 20B, and also a large diameter disc part 20A.
A thrust bearing 26 is interposed between the wobble plate 21 and the wobble plate 21, and the wobble plate 21 is swingably supported through the through bolt 3 with its rotation being restricted. Like the drive plate 20, the wobble plate 21 is formed in an annular shape so as to surround the drive shaft 4, and the wobble plate 21 and each of the pistons 16 are connected by connecting rods 22. That is, ball portions 22a, 22a formed in a spherical shape are integrally formed at both ends of the connecting rod 22, while the wobble plate 21 and each piston 1 are integrally formed.
6 is formed with a pair of socket portions 28, 28 facing each other, and ball portions 22a, 22a are swaged to each socket portion 28, 28 so as to be rotatable in the universal direction.

Each socket portion 28 is composed of a spherical recess 28A bored on the bottom side, and a caulking tube portion 29 integrally rising from the opening of the spherical concave portion 28A with a cylindrical hole portion 28C. 29 is provided with a step 28B between it and the opening of the spherical recess 28A. That is, the caulking cylindrical portion 29 is formed upright and has a slightly larger diameter than the opening of the spherical recess 28A so that a distance s is formed between the opening and the opening of the spherical recess 28A. Moreover, the spherical concave portion 28A is the ball portion 2.
The spherical concave portion ₂ is formed into a spherical shape with a spherical radius r ₂ that is the same as the spherical radius r ₁ of 2a, and a depth that is the same as or shallower than the spherical radius r ₁ .
The above-mentioned step portion 28B is provided at the opening end of 8A with a constant width dimension s. That is, the stepped portion 28B is on the same line as the boundary line (width direction center line) O'-O' of both the front and rear hemispheres of the ball portion 22a, or is on the same line as the boundary line (width direction center line) O'-O'. They are provided biased toward the base side with an appropriate interval d (for example, d=1 mm) between them. And also, the caulking cylinder part 2
9 is formed by standing up in a cylindrical shape leaving a certain thickness t, and the cylindrical hole 28C formed on the inner circumferential surface of the caulked cylinder part 29 is formed by the ball part 22a.
An appropriate groove radius between the axial center line O″−O″ of
_R2 ( _R2 > _r1 , for example, ( _R2 - _r1 ) is within 0.1 mm). That is, the cylindrical hole portion 28C is located between the ball portion 22a (R ₂
−r ₁ ). Then, the caulking cylindrical portion 29 is bent and deformed by the punch 30 while the tip (spherical surface on the tip side) of the ball portion 22a is engaged in the spherical recess 28A. That is, caulking is performed. The punch 30 has an insertion hole for the connecting rod 22 at one end and is formed into a substantially umbrella shape, and its inner peripheral surface has a spherical radius r ₃ (r ₃ <(r ₁ +
t)), and is provided so that the tip portion of the caulking cylinder portion 29 (the c ₁ portion in Fig. 3) can be brought into uniform surface contact with the spherical surface on the base side of the ball portion 22a. It will be done. In addition, the caulking cylinder part 29
A relief (section c ₂ in Fig. 3) is provided on the base side of the cylindrical portion 2 with a space between it and the ball portion 22a.
9 spring back can be prevented. That is, it is possible to prevent the distal end of the caulking cylinder part 29 from floating with respect to the ball part 22a.

The other part 19 is a sleeve that is slidably and loosely fitted into the drive shaft 4.
is connected to the small diameter cylindrical portion 20B of the drive plate 20 via a pair of left and right connecting pins 25, 25. Further, 23 is a pressure guide path for the discharge pressure communicating between the discharge chamber 7 and the crank chamber 17, and 24 is a control valve installed in the pressure guide path 23 for the discharge pressure, which opens and closes the control valve 24. By making the crank chamber 1
7 pressure control can be performed.

5 and 6 are drawings showing a second embodiment, in which the socket portion 28 has a spherical concave portion on the bottom side with a spherical radius r ₂ larger than the spherical radius r ₁ of the ball portion 22a. 28A' is provided.

7 and 8 are drawings showing a third embodiment, in which a shoe 3 is provided on the base side of the ball portion 22a.
Caulking is performed with 1 covered. More specifically, the shoe 31 has an insertion hole for the connecting rod 22 at one end and is formed into a substantially umbrella shape, and its inner peripheral surface has a spherical radius r ₄ that is the same as the spherical radius r ₁ . It is curved and formed. The shoe 31 is provided so as to cover the caulked cylinder portion of the ball portion 22a.

Next, its effect will be explained.

In the first embodiment shown in FIGS. 1 to 4, the wobble plate 21 swings continuously and the piston 16 moves back and forth continuously, so that
At the connecting portion between the wobble plate 21 and the connecting rod 22, and at the connecting portion between the piston 16 and the connecting rod 22, ball portions 22a and 2 are formed, respectively.
2a will violently swing and rotate in the universal direction, but in this way, the ball parts 22a, 2
2a is violently swinging and rotating in the universal direction, the ball portions 22a, 22a caulk two surfaces, the spherical surface on the base side and the spherical surface on the tip side, to the cylindrical portion 29.
Since the cylinder is caulked with its surface in contact with the spherical concave portion 28A, there is no wobbling in the caulked cylinder portion. More specifically, as shown in FIG. 4, when a tensile force R is applied in the direction of pulling the connecting rod 22 against the piston 16 (the direction in which the connecting rod 22 is removed from the spherical recess 28), the tensile force R reaction force in the opposite direction
When the reaction force R' is decomposed into a normal component N ₁ and a tangential component N ₂ , N ₁ = R'sinφ N ₂ = R'cosφ 0<φθ<π/2. , the force with which the caulking cylinder part 29 presses down the ball part 22a is represented by _N1 ,
The ball groove 28 has a certain width dimension s, and the stepped portion 2
8B, φ is inevitably larger than θ compared to the conventional caulking shown in FIG. 10, and as a result, R'sinφ>R'sinθ. That is, the force _N1 with which the caulking cylinder part 29 presses down the ball part 22a is larger than that of the conventional one, and no wobbling occurs. Furthermore, the caulking cylinder part 29
is bent and deformed by the punch 30 to form the ball portion 2
By uniformly making surface contact with the base side spherical surface of 2a, a stronger connected state can be obtained.

In the second example shown in FIGS. 5 and 6, the socket portion 28 has a spherical radius r ₂ larger than the spherical radius r ₁ of the ball portion 22a on the bottom side, and a spherical recess 28A'. Due to the fact that
A state is obtained in which the ball portion 22a makes surface contact with the bottom surface of the spherical recess 28A' without contacting the open end of the spherical recess 28A', and swings and rotates. That is, line contact between the ball portion 22a and the open end of the spherical recess 28A' can be prevented.

In the third embodiment shown in FIGS. 7 and 8, caulking is performed with the shoe 31 being crowned on the base side of the ball portion 22a. Caulking cylinder part 29
Since the shoe 31 is provided in between, the shoe 31 can increase the contact area (wear area) with the ball portion 22a and prevent rapid wear of the ball portion 22a. I can do it.

In each of the first to third embodiments, the caulking cylinder part 29 is formed into a substantially cylindrical shape, but the caulking cylinder part 29 is provided with a plurality of slits along its axial direction. It is also possible to form the cylindrical portion 29 into a petal shape.

〔Effect of the invention〕

The present invention is constructed as described above, and includes:
As mentioned above, a spherical recess is drilled in the wobble plate, which is mounted on the drive shaft so that it can swing freely while its rotation is restricted, and the piston, which is inserted into the cylinder bore so that it can move forward and backward. Then, a ball part formed at the end of the conrod is fitted into the spherical recess so as to be rotatable in the universal direction, and a crimping cylinder part formed upright on the peripheral edge of the spherical recess is crimped into the ball part. In the oscillating swash plate type compressor, the caulking cylinder is formed upright with a slightly larger diameter than the opening of the spherical recess, and the caulking cylinder is formed between the opening of the spherical recess and the opening of the spherical recess. The crimping cylinder part is formed with a slightly larger diameter than the diameter of the opening so that a stepped part is formed in the rising part, and the crimping cylinder part is formed with a diameter slightly larger than the diameter of the opening part. A gap is formed between the base and the ball part, and the gap gradually narrows from the base toward the distal end while extending closer to the ball part,
The tip is placed in surface contact with the spherical surface on the base side of the ball, and the ball is supported by two surfaces, the spherical surface on the base side and the spherical surface on the tip side, thereby preventing the occurrence of spring back. It has now been possible to effectively prevent this. In other words, by forming the caulking cylinder part upright from a position outside the opening of the spherical recess, and by forming the caulking cylinder part into a curve with a larger arc than the ball part, The effect of preventing the occurrence of spring back is obtained, and as a result, when a tensile force (force in the direction of the ball part coming out of the spherical recess) is applied to the connecting rod, the ball part can be firmly held, and this This has made it possible to prevent looseness in the connecting parts. By preventing the occurrence of rattling in the connecting parts in this way, it is possible to prevent wear and reduce noise in the connecting parts, thereby increasing the durability of the oscillating swash plate compressor. And quietness has been significantly improved.

[Brief explanation of the drawing]

1 to 4 are drawings showing a first embodiment, in which FIG. 1 is a sectional view showing the entire swinging swash plate compressor according to the connection method of the present invention, and FIG. 2 is a piston 3 is a sectional view showing the state in which the ball part of the connecting rod is engaged with the spherical concave part of FIG. 3 is a cross-sectional view showing a state in which the caulked portion is caulked. 5 and 6 are drawings showing the second embodiment,
FIG. 5 is a sectional view showing a state in which the ball portion of the connecting rod is engaged with the spherical recessed portion of the piston, and FIG. 6 is a sectional view showing a state in which the caulking portion is crimped to the ball portion. FIG. 7 is a drawing showing the third embodiment, and is a sectional view showing a state in which the ball part of the connecting rod is covered with a shoe and the caulking part is crimped to the ball part.
8 to 10 are drawings showing the conventional connection method, in which FIG. 8 is a sectional view showing the whole of the oscillating swash plate compressor, and FIG. 9 is a sectional view showing the connecting rod in the spherical recess of the piston. FIG. 10 is a cross-sectional view showing a state in which the ball portion is engaged, and FIG. 10 is a cross-sectional view showing a state in which the caulking portion is caulked to the ball portion. 1...Housing, 1F...Front housing, 1R...Rear housing, 2...Cylinder block, 3...Through bolt, 4...Drive shaft, 5A, 5B...Bearing section, 6...Suction chamber, 7 ...discharge chamber, 8 ... partition wall,
9...Suction port, 10...Discharge port, 11...Valve plate, 12...Suction valve, 13...Discharge valve, 1
4...Cylinder bore, 15...Compression chamber, 16...
... Piston, 17 ... Crank chamber, 18 ... Lug plate, 19 ... Sleeve, 20 ... Drive plate, 20A ... Large diameter disk part, 20B ... Small diameter cylinder part, 21 ... Wobble plate, 22 ... …
Conn rod, 22a...ball part, 23...pressure guide path for discharge pressure, 24...control valve, 2
5... Connection pin, 26... Thrust bearing, 27
... Radial bearing, 28 ... Socket part, 28
A, 28A'... Spherical concave portion, 28B... Step portion, 2
8C...Cylindrical hole part, 29...Crimped cylinder part, 30...
...Punch, 31...Show.

Claims (1)

[Claims] 1. A spherical recess is bored in each or either one of a wobble plate that is pivotably mounted on the drive shaft so that it can swing freely in a state where rotation is restricted, and a piston that is inserted into the cylinder bore so that it can move forward and backward,
The spherical surface on the tip end side of the ball part formed at the end of the connecting rod is fitted into the spherical recess so as to be rotatable in the universal direction, and a caulked cylinder is formed rising from the opening edge of the spherical recess. In a rocking swash plate compressor in which a caulking cylinder is caulked to a ball part, the caulking cylinder is larger than the diameter of the opening of a spherical recess so that a step is formed between the opening and the opening of the spherical recess. In order to form a rising cylinder with a slightly larger diameter dimension, and to crimp and deform the crimped cylinder part,
The caulking cylindrical portion has a gap formed between it and the ball portion via the stepped portion at the rising base, and
It is characterized by extending from the base toward the tip while gradually narrowing the gap and approaching the ball, so that the tip comes into surface contact with the spherical surface on the base side of the ball. A method for connecting connecting rods in a oscillating swash plate compressor.