JPH09184481A - Single head piston type swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent seizure and galling of a single head piston by restraining inclination of the single head piston in a single head piston type swash plate type compressor on which a swash plate and the single head piston are connected to each other by a shoe. SOLUTION: A plural number of single head pistons 5 respectively have their posture maintenance parts 53, these posture maintenance parts 53 constitute a ring by connecting with each other, these posture maintenance parts 53 are engaged with a bolt 25 integrating a housing so as not to speed the ring, and a sliding surface 53b of the posture maintenance parts 53 is inclined against a line L connecting a central point O of the ring and a side end edge S of the position maintenance parts 53 to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a swash plate compressor used for an air conditioner of an automobile, and more specifically, a so-called single-head piston type in which a piston is provided only on one surface side of the swash plate. Belongs to the swash plate compressor.

[0002]

2. Description of the Related Art A conventional single-head piston type swash plate compressor is
A housing having a plurality of cylinder bores, a drive shaft rotatably arranged in the center of the housing, a swash plate that is attached to the drive shaft at an inclination, and rotates together with the drive shaft, and a plurality of cylinder bores in the cylinder bores. A plurality of single-headed pistons, which are slidably inserted, respectively, are slidably held by the respective single-headed pistons so as to sandwich the swash plate, and convert the swinging motion of the swash plate into a linear reciprocating motion. And a shoe for transmitting to each of the single-headed pistons, and the plurality of single-headed pistons each have a posture maintaining portion, and these posture maintaining portions are configured to be continuous with each other to form a wheel (for example, See Japanese Utility Model Publication No. 7-4877).

[0003]

In the conventional single-head piston type swash plate compressor, an attitude maintaining section is provided near a portion of the single-head piston that holds the shoe, and the single-head pistons are connected to each other on the side surface of the attitude maintaining section. Since they are in sliding contact with each other, the side component force of the compressive load can be received by all single-headed pistons. However, in reality, the single-headed piston of the above-described single-headed piston type swash plate compressor includes the rotation direction of the single-headed piston (rotation about the axis of the single-headed piston as a rotation axis), the left-right direction (the axis of the single-headed piston and the drive shaft). Forces act in a direction orthogonal to a plane passing through the axis) and in a front-rear direction (direction orthogonal to the axis of the single-headed piston and the axis of the drive shaft).

Therefore, it is difficult to prevent all tilting of the single-headed piston in the above-described structure for maintaining the posture of the single-headed piston of the single-headed piston type swash plate compressor, and the single-headed piston causes tilting, which causes There was a risk of seizure or galling between the cylinders.

Therefore, an object of the present invention is to provide a single-head piston type swash plate compressor capable of accurately suppressing the inclination of the single-head piston to prevent seizure and galling of the single-head piston.

[0006]

According to the invention as set forth in claim 1, a housing having a plurality of cylinder bores, a drive shaft rotatably arranged at the center of the housing, and an inclination with respect to the drive shaft. A swash plate that is mounted and rotates together with the drive shaft, a plurality of single-headed pistons that are slidably inserted into the plurality of cylinder bores, and slides on the single-headed pistons so as to sandwich the swash plate. And a shoe that is freely held and that converts the swinging motion of the swash plate into a linear reciprocating motion and transmits it to each of the single-headed pistons, wherein the plurality of single-headed pistons each have a posture maintaining portion,
In the single-head piston type swash plate compressor, which is configured so that these posture maintaining sections are connected to each other to form a wheel,
The housing is integrated by a bolt that extends parallel to the center line of the cylinder bore and that passes between the adjacent cylinder bores, and the posture maintaining unit is provided with the bolt so that the ring does not spread. A single-headed piston that is engaged with each other, and that a sliding contact surface between the posture maintaining portions is inclined with respect to a line connecting a center point of the ring and a side end edge of the posture maintaining portion. A swash plate type compressor is obtained.

According to a second aspect of the present invention, the single-head piston type swash plate compressor according to the first aspect is characterized in that the posture maintaining section has an insertion hole through which the bolt is inserted. To be

According to a third aspect of the present invention, the sliding contact surface between the posture maintaining portions is subjected to a surface treatment excellent in sliding contact property and wear resistance. The single-headed piston type swash plate compressor according to claim 2 is obtained.

According to the invention described in claim 4, a lubricating groove is formed on a sliding contact surface between the posture maintaining portions, and the single head according to any one of claims 1 to 3. A piston type swash plate compressor is obtained.

[0010]

In the case of the single-headed piston type swash plate compressor of the present invention,
Each of the plurality of single-headed pistons has a posture maintaining unit. These posture maintaining sections are configured to be connected to each other to form a wheel, and the engagement of these posture maintaining sections causes the posture maintaining section to drive within the rotation of the single-headed piston and the inclination of the single-headed piston in the front-back direction. Tilt towards the axis is prevented. Further, since the single-headed piston engages with the bolt so that the ring formed by these does not spread, this engagement causes the attitude maintaining part to move away from the drive shaft within the inclination of the single-headed piston in the front-rear direction. Is prevented from tilting. Further, the engagement between the bolt and the single-headed piston prevents the single-headed piston from tilting in the left-right direction. Further, in the case of the single-head piston type swash plate compressor of the present invention, the sliding contact surface between the posture maintaining portions is inclined with respect to the line connecting the center point of the ring and the side edge of the posture maintaining portion. Therefore, as compared with the above-mentioned one in which the sliding contact surfaces of the posture maintaining portions are parallel to the radial direction of the ring, the area is wider, and therefore, the force applied per unit area of this sliding contact surface is smaller. Sliding contact is performed smoothly.

[0011]

1 is a longitudinal sectional view of a single-head piston type swash plate compressor according to a first embodiment of the present invention, and FIG. 2 is a perspective view of a single-head piston of the single-head piston type swash plate compressor shown in FIG. 3 and 4 are bottom views of the piston of the single-headed piston type swash plate compressor shown in FIG.

Referring to FIGS. 1 to 3, a single-head piston type swash plate compressor 1 according to the present embodiment includes a housing 2, a drive shaft 3, a swash plate 4, a single-head piston 5, and a shoe 6. Have

The housing 2 includes a front housing 20
, A housing body 21 and a cylinder head 22.

The front housing 20 has a substantially funnel shape. The front housing 20 has a radial needle bearing 200 and a thrust needle bearing 20.
1 and a shaft seal member 202 are provided.

The housing body 21 has a substantially cylindrical shape,
On one side thereof, a cylinder block 23 is integrally provided.
The housing main body 21 has one open end closed by the front housing 20 and the other open end closed by the cylinder head 22 with the valve plate device 24 interposed therebetween. The cylinder block 23 has a center hole 230 and a cylinder bore 231. The center hole 230 is formed at the center of the cylinder block 23, and the radial needle bearing 232 is disposed therein. The cylinder bore 231 is provided on the outer peripheral portion of the cylinder block 23.
They are formed at equal intervals so as to surround the center hole 230.

The cylinder head 22 has a suction chamber 220,
And a discharge chamber 221 is formed.

The front housing 20 is fixed to the housing body 21 by the first bolts 25, and the cylinder head 22 is fixed to the housing body 21 by the second bolts 26 with the valve plate device 24 interposed therebetween. The front housing 20 and the housing body 2
1 and the cylinder head 22 are integrated into a housing 2. The first bolt 25 extends parallel to the center line of the cylinder bore 231 near the inner peripheral wall surface of the housing body 21 and passes between adjacent cylinder bores 231.

The drive shaft 3 is rotatably supported by the front housing 20 and the cylinder block 23 via radial needle bearings 200 and 232, and is located at the center of the housing 2. The tip portion of the drive shaft 3 projects from the tip of the front housing 20 to the outside of the compressor, and at this portion via an electromagnetic clutch (not shown),
For example, the force from an engine (not shown) is transmitted.

The swash plate 4 has a spherical bush 8 mounted on the drive shaft 3 so as to be movable in the axial direction thereof.
Is mounted on the drive shaft 3 so that the inclination angle with respect to the drive shaft 3 is variable.
The swash plate 4 is flexibly connected to a rotor 9 fixed to the drive shaft 3, whereby the swash plate 4 rotates together with the drive shaft 3. Further, a coil spring 10 mounted on the drive shaft 3 is interposed between the swash plate 4 and the rotor 9, and the coil spring in 10
The swash plate 4 is urged in such a manner that its inclination angle becomes smaller.

Each single-headed piston 5 has a piston portion 50, a rod portion 51, a shoe receiving portion 52, and a posture maintaining portion 53. The piston part 50 is slidably inserted into the cylinder bore 231. The rod portion 51 connects the piston portion 50 and the shoe receiving portion 52. The shoe receiving portion 52 has a recessed shoe receiving surface 52a, and here slidably holds a pair of shoes 6 with the swash plate 4 interposed therebetween. The posture maintaining portion 53 is a curved, substantially plate-shaped member, and has an insertion hole 53a formed in one side thereof and extending parallel to the axial direction of the piston portion 50.
The posture maintaining portions 53 of the adjacent single-headed pistons 5 face each other on their side surfaces, and the posture maintaining portions 53 of all the single-headed pistons 5 are connected in a substantially ring shape to form a ring as shown in FIG. I am configuring. A clearance is provided between the adjacent posture maintaining units 53, and the posture maintaining units 5
It is designed so that the three can slide together. As is apparent from FIG. 3, the sliding contact surface 53b between the posture maintaining portions 53 has a center point O of the wheel and a side edge (a side edge in the circumferential direction of the wheel) S of the posture maintaining section 53. Is inclined with respect to the straight line L connecting the lines. With this configuration, the area becomes wider and the force applied per unit area of the sliding contact surface 53b becomes smaller than that in the case where the sliding contact surface 53b is parallel to the radial direction of the ring. There is. As a result, the posture maintaining portions 53 can be smoothly brought into sliding contact with each other. This sliding surface 5
As is clear from FIG. 3, the relationship between the inclination direction of 3b and the rotation direction of the drive shaft is that in the rotation direction R of the drive shaft 3, the inner edge of the sliding contact surface 53b is located at the front and the outer edge is located at the rear. Is made to do. Although it is desirable to incline the sliding contact surface 53b in this manner, the sliding contact surface 53b may be inclined in the opposite direction. Therefore, the direction of the sliding contact surface 53b is not particularly limited. Posture maintaining unit 53
The sliding contact surface 53b is subjected to surface treatment excellent in sliding contact property and wear resistance.

As described above, since the posture maintaining portions 53 of the single-headed piston 5 form a ring, the engagement of the posture maintaining portions 53 causes the single-headed piston 5 to rotate and the single-headed piston 5 to rotate. Of the inclination in the front-back direction, the inclination of the posture maintaining portion 53 toward the drive shaft 3 is prevented, and the first bolt 25 inserted into the insertion hole 53a engages with the insertion hole 53a. The above-mentioned ring is prevented from expanding, and therefore, of the tilts of the single-headed piston 5 in the front-rear direction, the tilt in the direction in which the posture maintaining portion 53 moves away from the drive shaft 3 is prevented. Further, the engagement between the first bolt 25 and the posture maintaining portion 53 prevents the single-headed piston 5 from tilting in the left-right direction.

The shoes 6 are slidably arranged on the shoe receiving portions 52 of the single-headed piston 5, respectively, and slidably sandwich the swash plate 4. As a result, the shoe 6 transmits only the reciprocating linear motion to the shoe receiving portion 52 out of the swinging motion performed by the swash plate 4 rotating with the drive shaft 3, and the single-headed piston 5 reciprocating linearly within the cylinder bore 231. Made to exercise.

The single-head piston type swash plate type compressor of this embodiment is a variable displacement type compressor.
It can also be applied to a constant-capacity single-head piston type swash plate compressor.

FIG. 4 is a perspective view of a single-head piston in a single-head piston type swash plate compressor according to the second embodiment of the present invention. With reference to FIG. 4, in the single-head piston type swash plate compressor of the present embodiment, only the single-head piston 5 is different from that of the first embodiment, and therefore only this portion is illustrated. The single-headed piston 5 in the present embodiment has the same configuration as that shown in FIG. 2 except for the posture maintaining portion 53, and therefore, portions common to those shown in FIG. 2 are denoted by the same reference numerals and description thereof is omitted. To do. In the single-headed piston 53 shown in FIG. 2, the posture maintaining unit 5
Although the three sliding contact surfaces 53b are surface-treated with excellent sliding contact property and wear resistance, in the present embodiment, instead of this surface treatment, the sliding contact surface 53b of the posture maintaining portion 53 has a lubricating groove. 5
3c is formed. By passing the lubricating oil contained in the blow-by gas into the lubricating groove 53c, the sliding contact surface and the wear resistance are ensured. Of course, also in this embodiment, the sliding contact surface 53b may be subjected to a surface treatment excellent in sliding contact property and wear resistance.

[0025]

EXAMPLE Teflon (registered trademark) coating is suitable for the surface treatment that is performed on the sliding contact surfaces 53b of the posture maintaining portions 53 and has excellent sliding contact resistance and wear resistance.

[0026]

The single-head piston type swash plate compressor according to the present invention can prevent not only the rotation of the single-head piston but also the inclination of the single-head piston in the left-right direction and the front-back direction. As a result, seizure of the single-head piston, It is possible to prevent galling. Further, in the single-head piston type swash plate compressor of the present invention, the sliding surface between the posture maintaining portions is inclined with respect to the radial direction of the ring formed by the posture maintaining portions, and thus the area of this sliding contact surface is Therefore, since the force applied per unit area of the sliding contact surface is small, the sliding contact can be carried out smoothly, and long-term use can be endured.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a single-head piston type swash plate compressor according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a single-head piston of the single-head piston type swash plate compressor shown in FIG.

FIG. 3 is a bottom view of a piston of the single-headed piston type swash plate compressor shown in FIG. 1.

FIG. 4 is a perspective view of a single-head piston in a single-head piston type swash plate compressor according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Variable capacity type swash plate compressor 2 Housing 3 Drive shaft 4 Swash plate 5 Single-headed piston 6 Shoe 25 First bolt 26 Second bolt 50 Piston part 51 Rod part 52 Shoe receiving part 53 Posture maintaining part 53b Sliding contact surface

Claims (4)

[Claims] 1. A housing having a plurality of cylinder bores, a drive shaft rotatably disposed in the center of the housing, a swash plate mounted at an inclination to the drive shaft, and rotating together with the drive shaft, A plurality of single-headed pistons slidably inserted into a plurality of cylinder bores and slidable plates are sandwiched between the single-headed pistons so as to be slidably held by the respective single-headed pistons, and the swinging motion of the swash plate is linear. A plurality of single-headed pistons, each of which has a posture maintaining portion, and these posture maintaining portions are connected to each other to form a wheel. In the single-headed piston type swash plate compressor, the housing is integrally formed by a bolt extending parallel to the center line of the cylinder bore and passing between the adjacent cylinder bores. The posture maintaining portion is engaged with the bolt so that the wheel does not spread, and the sliding contact surface between the posture maintaining portions is the center point of the wheel and the posture. A single-headed piston type swash plate compressor characterized by being inclined with respect to a line connecting a side end edge of a retaining portion. 2. The single-head piston type swash plate compressor according to claim 1, wherein the posture maintaining portion has an insertion hole through which the bolt is inserted. 3. The single-headed piston type according to claim 1, wherein the sliding contact surface between the posture maintaining portions is subjected to a surface treatment having excellent sliding contact property and wear resistance. Swash plate type compressor. 4. The single-headed piston type swash plate compressor according to claim 1, wherein a lubricating groove is formed on a sliding contact surface between the posture maintaining portions.