JPH05106559A - Air compressor - Google Patents

Abstract

PURPOSE:To enhance the easiness in works by preventing a spring seat from being dislocated at the time of installing a discharge valve etc. CONSTITUTION:At a cylinder head 7 a plurality of guide pawls 20, 20,... are installed protruding from valve seat part 7A toward a head cover 19 to surround a discharge valve 17 and a valve spring 18. A valve seat 22 is provided with a lid part 22A, which bears the load of the valve spring 18, and detent pawls 22B which protrude downward from the periphery of the lid part 22A and are engaged by the guide pawls 20. The valve seat 22 is located in the radial and circumferential directions of the discharge valve 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air compressor, and more particularly to an air compressor in which a valve spring of a discharge valve is compressed when a head cover is attached.

[0002]

2. Description of the Related Art Generally, a cylinder in which a piston reciprocates, a cylinder head mounted on the cylinder and having a suction hole and a discharge hole communicating with the inside of the cylinder, and a cylinder head provided in the cylinder head, A suction valve that opens and closes a suction hole, a discharge valve that is provided in the cylinder head and that opens and closes the discharge hole, and a discharge valve that is located on the discharge valve and the suction valve and that is attached to the cylinder head. BACKGROUND ART An air compressor including a head cover that holds a valve spring of a valve in a compressed state is known.

In this type of conventional air compressor, while the piston reciprocates in the cylinder, outside air is sucked into the cylinder from the suction hole through the suction valve while compressed air is discharged from the discharge hole. It is designed to be discharged through. Further, the valve spring of the discharge valve is held in a compressed state by the head cover and constantly urges the discharge valve in the valve closing direction.

[0004]

By the way, in the above-mentioned prior art, when the valve spring of the discharge valve is brought into direct contact with the head cover, the end portion of the valve spring is attached to the head cover when the discharge valve is assembled, opened or closed. The inner surface of the head cover is strongly interfered with, and the inner surface of the head cover is peeled off or abraded to cause rust or the like.

Therefore, it is considered that a spring seat is provided between the valve spring of the discharge valve and the head cover, and the spring seat receives the spring load of the valve spring to protect the inner surface of the head cover. However, in this case, at the time of assembling the discharge valve, a seat-shaped spring seat is arranged on the valve spring of the discharge valve, and the head cover is attached to the cylinder head while being pressed by the head cover via the spring seat. At times, the spring seat may be displaced with respect to the valve spring, which makes it difficult to position the spring seat.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention enables a spring seat to be easily positioned between the valve spring of the discharge valve and the head cover, thus improving workability during assembly. The purpose is to provide a compressed air compressor.

[0007]

The features of the structure adopted by the present invention to solve the above-mentioned problems are that the cylinder head is circumferentially spaced outward in the radial direction of the discharge valve and protrudes toward the head cover side. A plurality of guide claws are provided, which are positioned between the valve spring of the discharge valve and the head cover in the radial direction of the discharge valve by engaging the guide claws and receiving the spring load of the valve spring. There is a spring seat.

[0008]

With the above construction, when the discharge valve is assembled in the cylinder head, the discharge valve is inserted between the guide claws together with the valve spring, and the spring seat is arranged from above the spring seat so that the spring seat is located at the upper end of each guide claw. By engaging with the side, it is possible to compress the valve spring while guiding the spring seat by each guide claw when mounting the head cover, and prevent the spring seat from being displaced with respect to the valve spring.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

First, FIGS. 1 to 3 show a first embodiment of the present invention.

In the drawing, reference numeral 1 denotes a crankcase defining a crank chamber A, which is integrally provided in a casing of an electric motor 2 and a crankshaft 3 is provided by a rotating shaft 2A of the electric motor 2. It is driven to rotate.
A balance weight 3A is integrally provided on the crank shaft 3 to balance the rotation of the crank shaft 3.

Reference numeral 4 denotes a cylinder mounted on the crankcase 1, 5 denotes a piston slidably fitted in the cylinder 4, and the piston 5 is connected to the crankshaft 3 via a connecting rod 6. , Reciprocates up and down in the cylinder 4.

7 is mounted on the cylinder 4, bolts 8,
A cylinder head fixedly attached to the cylinder 4 via 8, ... Is formed, and a suction hole 8 and a discharge hole 9 communicating with the inside of the cylinder 4 are formed in the valve seat portion 7A on the bottom side of the cylinder head 7. The suction hole 8 and the discharge hole 9 communicate with the suction passage 10 and the discharge passage 11 in the cylinder head 7. Further, a filter chamber 12 communicating with the suction passage 10 is integrally provided in the cylinder head 7, and a filter 13 that cleans the outside air from the intake port 12A and sucks it into the suction passage 10 is provided in the filter chamber 12. It is provided. Reference numeral 14 denotes a discharge port provided integrally with the cylinder head 7. The discharge port 14 communicates with the discharge passage 11, and the compressed air discharged from the discharge passage 11 is supplied to an external pneumatic device (either by an air dryer or the like). (Not shown).

Reference numeral 15 designates a suction valve which is provided inside the cylinder head 7 and is located on the suction passage 10 side of the cylinder head 7. The suction valve 15 is provided in the cylinder 4 while the piston 5 reciprocates. The valve is opened against the spring 16, and the suction hole 8
Is designed to open and close. Reference numeral 17 denotes a discharge valve provided in the cylinder head 7 located on the discharge passage 11 side, and the discharge valve 17 is a valve spring 18 in the discharge stroke of the piston 5.
The discharge hole 9 is opened and closed against the above.

Reference numeral 19 denotes a head cover which closes the upper end side of the cylinder head 7 after the suction valve 15 and the discharge valve 17 have been assembled. The head cover 19 is mounted on the cylinder head 7 via the respective bolts 8 and the discharge valve 17 is provided. Valve spring 1
8 is kept in a compressed state to apply an initial load to the valve spring 18.

Reference numerals 20, 20, ... Depict guide claws which are located on the discharge passage 11 side and are erected on the valve seat portion 7A of the cylinder head 7 so as to surround the circumference of the discharge valve 17, and each of the guide claws. As shown in FIGS. 2 and 3, the reference numeral 20 projects upward from the valve seat portion 7A toward the head cover 19 and is arranged in the circumferential direction of the discharge valve 17 at an angular interval of, for example, 90 degrees.
Each of the guide claws 20 is formed in an arc shape so as to form a concentric circle with the discharge valve 17, and a lower end side thereof serves as a thick discharge valve guide portion 20A that holds the discharge valve 17 in a liftable manner. Above the portion 20A is a thin-walled spring seat guide portion 20B for accommodating the valve spring 18 between the discharge valve 17 and a spring seat 22 described later so as to be vertically movable.

Further, each of the guide claws 20 is formed with an abutting step portion 20C located on the upper end side of the spring seat guide portion 20B and abutting on an outer peripheral side of a lid portion 22A of a spring seat 22 which will be described later. A taper portion 20D is formed between the valve guide portion 20A and the spring seat guide portion 20B. Then, between the guide claws 20, four space portions 2 forming a part of the discharge passage 11 are formed.
1, 2, ... Are formed, and when the discharge valve 17 is opened, compressed air is discharged toward the discharge port 14 side through the respective space portions 21.

Reference numeral 22 designates a spring seat disposed between the valve spring 18 of the discharge valve 17 and the head cover 19, and the spring seat 2
2 is formed by press-molding a metal plate having high wear resistance as shown in FIG. 2, and has a substantially disc-shaped lid portion 22A and a radially outwardly projecting outer peripheral side of the lid portion 22A, which is directed downward. Engaging claw portion 22 having a substantially L shape as an extended engaging portion
B, 22B, ... Further, each engaging claw portion 22B of the spring seat 22 is formed with a width dimension in the circumferential direction corresponding to the spacing dimension between the guide claws 20.
Even in the free length state of No. 8, it has a length (projection) dimension to be engaged between each guide claw 20. Although the spring seat 22 is movable in the axial direction (vertical direction) of the discharge valve 17 by engaging the engaging claw portions 22B between the guide claws 20, the radial direction and the circumferential direction of the discharge valve 17 are large. It is positioned in the direction. Further, the outer peripheral side of the lid portion 22A of the spring seat 22 is disposed in an engaged state on the contact step portion 20C of each guide claw 20,
The spring seat 22 is positioned between the guide claws 20 as shown in FIGS.

Further, 23 is an intake port 1 of the filter chamber 12.
2A shows a flexible hose connected to 2A. The hose 23 has a tip end side (not shown) arranged at a predetermined position to prevent water such as rainwater from entering the filter chamber 12, and the piston 5 At the time of reciprocal movement, the outside air is sucked into the cylinder 4 from the tip side through the filter chamber 12, the suction passage 10 and the like. The air compressor according to the present embodiment has the above-mentioned structure, and the basic operation thereof is not different from that of the prior art.

Therefore, the discharge valve 17 which is a feature of this embodiment
The assembling process will be described.

First, prior to the mounting of the head cover 19, the suction valve 15 is assembled on the suction hole 8 side of the cylinder head 7 together with the spring 16, etc., and the discharge valve 17 is provided on the discharge hole 9 between the guide claws 20 as a valve spring. Insert with 18. Then, in this state, the engaging claw portions 22 of the spring seat 22 are interposed between the guide claws 20.
Insert the spring seat 22 into each guide claw 20
It is arranged on the upper side, and the lid portion 22A of the spring seat 22 is brought into contact with the upper end side of the valve spring 18.

Next, in this state, the head cover 19 is arranged so as to be arranged on the upper end side of the cylinder head 7.
When the spring seat 22 is pushed downward against the valve spring 18 while abutting 9 on the lid portion 22A of the spring seat 22, each engaging claw portion 22B of the spring seat 22 causes each guide claw 20 to move. Is guided downward while being engaged between the spring seat guide portions 20B of
The outer peripheral side of the lid portion 22A of the spring seat 22 abuts on the abutting step portion 20C of each guide claw 20, and the head cover 19 abuts on the upper end of the guide claw 20 as shown in FIGS.
Then, in this state, if the head cover 19 is fixed onto the cylinder head 7 by the bolts 8, the valve spring 18 of the discharge valve 17 is given an initial load, and the guide claws 2 are provided.
Between 0, it is held in a compressed state via the spring seat 22.

Thus, according to the present embodiment, for example, four guide claws 20, 20, ... Are located around the discharge hole 9 and are respectively erected on the valve seat portion 7A of the cylinder head 7, and the discharge valve is provided. Each of the guide claws 20 surrounds the periphery of the valve spring 17 and the valve spring 18, and the lid 22A of the spring seat 22 is provided on the valve spring 18 such that the engaging claws 22B are engaged between the guide claws 20. Since the valve spring 18 is arranged and the valve spring 18 is compressed via the spring seat 22 when the head cover 19 is attached,
The spring seat 22 can be positioned on each guide claw 20 in the radial direction and the circumferential direction, and the spring seat 2 can be mounted when the head cover 19 or the like is attached.
It is possible to effectively prevent the position shift of 2 with respect to the valve spring 18.

Therefore, in this embodiment, the spring seat 22 can be easily positioned between the valve spring 18 of the discharge valve 17 and the head cover 19, and the workability during assembly can be greatly improved. Further, the spring load of the valve spring 18 is set to the spring seat 22.
Since it can be reliably received by the lid portion 22A of the head cover 1
The inner surface of 9 can be prevented from being peeled off, worn or damaged by the valve spring 18, and the head cover 19
It is possible to solve problems such as rust on the surface.

Next, FIG. 4 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. To do
The feature of the present embodiment is that the spring seat 32 is positioned by engaging the spring seat 32 from the outside with the outer periphery of the upper end side of each guide claw 31 provided on the cylinder head 7.

Here, the guide claws 31 have substantially the same structure except the guide claws 20 and the contact step portions 20C described in the first embodiment, and the thick discharge valve guide portion 31A and the thin discharge valve guide portion 31A. It has a spring seat guide portion 31B and a taper portion 31C. Each spring seat guide portion 31B is formed in a relatively short length so that its upper end is separated from the head cover 19.

The spring seat 32 has a structure similar to that of the spring seat 22 described in the first embodiment, but is formed in a cylindrical shape having a diameter larger than that of the spring seat 22. And
The spring seat 32 is provided with a lid portion 32A formed in a substantially disc shape so as to receive the spring load of the valve spring 18, and downwardly extending from the outer peripheral side of the lid portion 32A. It is composed of an engagement cylinder portion 32B as an engagement portion for positioning the entire spring seat 32 in the radial direction of the discharge valve 17 by slidably engaging the side surface. In addition, the engagement tubular portion 32B
Has a length (projection) dimension that engages with the outer surface of each guide claw 20 even when the valve spring 18 is in the free length state.

Thus, in this embodiment having such a structure, it is possible to obtain substantially the same operational effect as that of the first embodiment.

In the second embodiment, the spring seat 32
The cover 32A and the engaging cylinder 32B are described as being formed into a cylindrical shape with a cover. However, instead of this, the spring seat 32 is provided with a plurality of engaging members similar to the spring seat 22 described in the first embodiment. A mating claw portion may be provided, and in this case, each engaging claw portion may be engaged with the outer surface of each guide claw 31.

[0030]

As described above in detail, according to the present invention, a plurality of guide claws which are spaced apart from each other in the circumferential direction on the outer side in the radial direction of the discharge valve are provided on the cylinder head so as to protrude toward the head cover. Since a spring seat that engages with each guide claw and is positioned in the radial direction of the discharge valve is provided between the head cover and the head cover, the spring seat acts as a valve spring when the valve spring of the discharge valve is compressed when the head cover is attached. It is possible to surely prevent the position from being displaced, the workability at the time of installation can be greatly improved, and the spring load of the valve spring can be received by the spring seat.
Problems such as rust on the head cover can be solved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an air compressor according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing each guide claw and a spring seat in FIG. 1 in an enlarged manner.

3 is an enlarged cross-sectional view of a main part in FIG. 1 showing a discharge valve and the like.

FIG. 4 is an enlarged sectional view of an essential part similar to FIG. 3 showing a second embodiment.

[Explanation of symbols]

 4 Cylinder 5 Piston 7 Cylinder head 8 Suction hole 9 Discharge hole 15 Suction valve 17 Discharge valve 18 Valve spring 19 Head cover 20,31 Guide claw 22,32 Spring seat

Claims (1)

[Claims] 1. A cylinder in which a piston reciprocates, a cylinder head mounted on the cylinder and having a suction hole and a discharge hole communicating with the inside of the cylinder, and a suction hole provided in the cylinder head. A suction valve that opens and closes the discharge valve and a discharge valve that is provided in the cylinder head and that opens and closes the discharge hole; and a discharge valve that is located above the discharge valve and the suction valve and attached to the cylinder head. In an air compressor including a head cover that holds a valve spring in a compressed state, the cylinder head is provided with a plurality of guide claws that are circumferentially spaced apart from the discharge valve in the radial direction and project toward the head cover side. A spring which engages with each guide claw between the valve spring of the discharge valve and the head cover, is positioned in the radial direction of the discharge valve, and receives the spring load of the valve spring. An air compressor characterized by having a seat.