JPH11303992A - Reciprocating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating machine having sealing performance not deteriorated even under low temperatures and capable of reducing damage of a lip ring caused by a fatigue failure as far as possible. SOLUTION: A reciprocating machine is provided with a cylinder 1 and a swing position 2 having a piston main body 3 having a connecting rod 6 connected to a crank shaft 9 and to be reciprocated in the cylinder so as to be slid and oscillated and a lip ring 7 provided on the piston main body and for sealing a part between the piston main body and the cylinder, and the lip ring of a swing piston contains magnetic materials, and the cylinder is formed of a magnetic substance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating machine used for an air compressor or the like, and more particularly to a machine having a swing piston in a cylinder.

[0002]

2. Description of the Related Art As a prior art of a reciprocating machine having a swing piston, there is a technique disclosed in Japanese Utility Model Laid-Open Publication No. 64-32577. The technology disclosed in the above publication includes a piston body integrally provided with a connecting rod connected to a crankshaft and reciprocating while swinging in a cylinder.
A reciprocating machine that includes a locking piston in a cylinder, which is provided on the piston body, seals between the piston body and the cylinder, and has a self-lubricating and flexible lip ring made of a resin material, is disclosed. .

[0003]

However, in the above technique, since the lip ring is formed of a resin material, the flexibility of the lip ring at room temperature and the followability of the lip ring with the inner peripheral side of the cylinder at normal temperature. Is secured,
At low temperatures, the lip ring is hardened, and the following performance of the lip ring with the inner peripheral surface of the cylinder is deteriorated, and the sealing performance may be deteriorated.

[0004] Therefore, an object of the present invention is to provide a reciprocating machine in which the sealing property of the lip ring is not impaired even at a low temperature in order to solve the above problems.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a cylinder, a connecting rod connected to a crankshaft, a piston body reciprocating while sliding and swinging in the cylinder. A swing piston having a lip ring provided on the piston body and sealing between the piston body and the cylinder, wherein the lip ring of the swing piston contains a magnetic material, and the cylinder is magnetic. It consists of a body.

According to the first aspect, since the cylinder is made of a magnetic material and the lip ring contains a magnetic material, even when the piston is swung when the lip ring is hardened at a low temperature, the lip ring can be rotated. The magnetic force is applied in a direction close to the inner peripheral surface of the cylinder, so that deterioration of the sealing property between the lip ring and the inner peripheral surface of the cylinder at low temperatures can be suppressed.

According to a second aspect of the present invention, there is provided a piston body provided with a cylinder, a connecting rod connected to a crankshaft and reciprocating while sliding and swinging in the cylinder, and a piston body provided on the piston body and the cylinder. A swing piston having a lip ring that seals between them, and a swing piston having a lip ring, wherein a contact portion of the lip ring with a cylinder inner peripheral surface is made of a resin material, and a bent portion bent by swinging of the piston is It is made of an elastic member that is more flexible than a resin material.

According to the second aspect, the contact portion of the lip ring is formed of a resin material, and the bent portion is formed of an elastic member having better flexibility than the resin material. The durability of the bent part which receives bending stress due to the piston swing can be suppressed without deteriorating the followability between the contact part sliding on the inner peripheral surface of the cylinder and the inner peripheral surface of the cylinder. It can be improved as compared with a resin material.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a reciprocating machine according to a first embodiment of the present invention. In the first embodiment, the reciprocating machine is used for a pneumatic vehicle height adjustment device for a vehicle.

The configuration will be described. The reciprocating machine comprises a cylinder 1 and a swing piston 2. The swing piston 2 is provided with a connecting rod 6 connected to a crankshaft 9, and a piston body 3 and a piston body 3 reciprocate while sliding and swinging in the cylinder 1. And a lip ring 7 for sealing between the piston body 3 and the cylinder 1.

The cylinder 1 is made of a magnetic material (for example, iron-based metal), and a valve seat member (not shown) having a suction valve and a discharge valve is provided above the cylinder 1 in the axial direction.

With respect to the swing piston 2, the piston main body 3 is composed of two members, a piston upper part 4 and a piston lower part 5, and the piston upper part 4 and the piston lower part 5 are fixed to each other by screwing. At the center of the lower surface of the piston lower part 5, a connecting rod 6 is integrally provided. The lower end side of the connecting rod 6 in the axial direction is connected to a crankshaft 9, and the crankshaft 9 is connected to an output shaft (not shown) of the motor and driven by the motor. A lip ring 7 for sealing between the piston body 3 and the inner peripheral surface of the cylinder 1 is made of a self-lubricating and flexible resin material (for example, Teflon resin) or a magnetic material (for example, magnet powder such as ferrite powder). The swing piston 2 is fixed to the piston main body 3 by being sandwiched between the lower portion 5a of the upper surface of the piston 4 and the lower portion 5a of the upper surface of the lower portion 5 of the piston.

The operation of the reciprocating machine according to the first embodiment will be briefly described. When the swing piston 2 slides in the cylinder 1 from the top dead center (upper side in the drawing) to the lower dead center (lower side in the drawing) in the cylinder 1 by driving of the motor, the upper part of the swing piston 2 and the cylinder 1 are moved from the suction valve. The atmosphere is sucked into the enclosed compression space. When the swing piston 2 slides in the cylinder 1 from the bottom dead center to the top dead center,
The atmosphere in the compression space is compressed, and the atmosphere is discharged from the discharge valve.

According to the reciprocating machine of the first embodiment,
When the swing piston 2 slides in the cylinder 1 at normal temperature, the contact portion 7b of the lip ring 7 with the inner peripheral surface of the cylinder 1 is caused by the suction and discharge pressure acting in the cylinder 1 and the magnetic force of the magnetic material. Since the inner peripheral surface of the cylinder 1 is urged, the inner peripheral surface of the cylinder 1 slides along the outer peripheral surface of the piston body 3 to seal the gap between the piston main body 3 and the inner peripheral surface of the cylinder 1.

Further, at a low temperature when the resin material is hardened, even if the lip ring 7 is hardened, the contact portion 7b of the lip ring 7 contains a magnetic material, so that the cylinder 1 made of a magnetic material can be used. It is energized toward it. Therefore, it is possible to suppress as much as possible the contact portion 7b from following the inner peripheral surface of the cylinder 1.

In this embodiment, a magnetic material is formed by kneading a material obtained by kneading a resin material and a magnet powder into a lip ring shape by compression molding or injection molding, and then magnetizing the material. Contained in

Next, a second embodiment of the present invention will be described. FIG. 2 is a sectional view of a reciprocating machine according to a second embodiment of the present invention. FIG. 3 is an enlarged view of a lip ring 17 which is a main part of FIG. In the second embodiment, the reciprocating machine is used for the pneumatic vehicle height adjustment device, similarly to the first embodiment.

The configuration will be described. The reciprocating machine is composed of a cylinder 11 and a swing piston 12. The swing piston 12 is provided with a connecting rod 16 connected to a crankshaft 19, and a piston body 13 and a piston which reciprocate while sliding and swinging inside the cylinder 11. A lip ring 17 is provided on the main body 13 to seal between the piston main body 13 and the cylinder 11. The contact portion 17b of the lip ring 17 with the inner peripheral surface of the cylinder 11 is made of a resin material, and the bent portion 17c that is bent by the swing of the swing piston 12 is made of an elastic member that is more flexible than the resin material. Is done.

The second embodiment differs from the first embodiment only in that the configuration of the lip ring 17 and the material of the cylinder 11 are not particularly limited, and the other configurations and operations are the same as those of the first embodiment. The description is omitted because it is the same as that of the embodiment.

The contact portion 17b of the lip ring 17 which contacts the inner peripheral surface of the cylinder 11 and the fixing portion 17a fixed to the piston body 13 are made of a self-lubricating and flexible resin material (for example, Teflon-based resin). The contact portion 17b
The bent portion 17c, which is bent between the swing portion 12 and the fixed portion 17a when the swing piston 12 swings, is made of an elastic member (for example, a fluoroethylene propylene resin, an elastomer, or rubber) that is more flexible than a resin material.

As shown in FIG. 3, the lip ring 17 has a contact portion 17b and a fixed portion 17a made of a resin material and a bent portion 17c made of an elastic member. The formed bent portion 17c has a contact portion 17b and a fixed portion. The lip ring 17 is secondarily formed in a form to give 17a. Here, if a seal between the bent portion 17c and the contact portion 17b or between the bent portion 17c and the fixed portion 17a is required, an adhesive may be applied between them.

With such a configuration, the followability of the contact portion 17b with the inner peripheral surface of the cylinder 11 does not decrease, and the durability of the bending portion 17c which receives bending stress due to the swing of the swing piston 12 is bent. It is improved as compared with the case where a resin material is used for the portion.

[0023]

According to the first aspect, since the cylinder is made of a magnetic material and the lip ring contains a magnetic material, even when the piston is swung when the lip ring is hardened at a low temperature. Since the lip ring is urged in a direction that comes into close contact with the inner peripheral surface of the cylinder, it is possible to minimize the deterioration of the lip ring's ability to follow the inner peripheral surface of the cylinder. Deterioration of the sealing performance with the surface can be suppressed.

According to the second aspect, the contact portion of the lip ring is formed of a resin material, and the bent portion is formed of an elastic member having higher flexibility than the resin material. Therefore, the seal between the lip ring and the inner peripheral surface of the cylinder at a low temperature is provided. The durability of the bent part which receives bending stress due to the piston swing can be suppressed without deteriorating the followability between the contact part sliding on the inner peripheral surface of the cylinder and the inner peripheral surface of the cylinder. It can be improved as compared with a resin material.

[Brief description of the drawings]

FIG. 1 is a sectional view of a swing piston according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a swing piston according to a second embodiment of the present invention.

FIG. 3 is a main enlarged view of FIG. 2;

[Explanation of symbols]

 1, 11 ... cylinder 2, 12 ... swing piston 3, 13 ... piston body 4, 14 ... piston upper part 5, 15 ... piston lower part 6, 16 ... connecting rod 7, 17 ... Rip rings 9, 19 ... Crank shaft

Claims (2)

[Claims] 1. A cylinder, a connecting rod connected to a crankshaft, a piston body reciprocating while sliding and swinging in the cylinder, and a piston body provided on the piston body and between the piston body and the cylinder. A swing piston having a lip ring for sealing
The lip ring of the swing piston contains a magnetic material, and the cylinder is made of a magnetic material. 2. A cylinder, a connecting rod connected to a crankshaft, a piston body reciprocating while sliding and swinging in the cylinder, and a piston body provided on the piston body and between the piston body and the cylinder. A swing piston having a lip ring for sealing
Wherein the contact portion of the lip ring with the cylinder inner peripheral surface is made of a resin material, and the bent portion bent by the swing of the piston is more flexible than the resin material. A reciprocating machine comprising an elastic member.