JP2019199813A - Cylinder head and air compressor - Google Patents

Abstract

To provide a technique for keeping airtightness in a cylinder constant by precisely applying a non-solid packing by a fixed coating amount along a preset coating position.SOLUTION: According to an embodiment, a cylinder head 7 comprises: a head contact region 25 which faces a body end face extended continuously so as to surround a periphery of a cylinder opening part 8p exposed from a cylinder body, and comes into contact with the body end face in assembling; and a groove part 26 which is provided along the head contact region, and arranged so as to continuously surround the periphery of the cylinder opening part. A groove part is configured by making the head contact region be partly recessed, and is configured to pass, in a narrowest region 25p of the head contact region, through the center part thereof.SELECTED DRAWING: Figure 4

Description

  Embodiments described herein relate generally to a cylinder head and an air compressor including the cylinder head.

  An air compressor is a device that compresses air and sends out the compressed air (ie, compressed air) according to the application. For example, a nailing operation or a wheel nut removal operation is performed. It can be performed using the power of compressed air.

  In an air compressor, in order to maintain constant airtightness in a cylinder in which a piston reciprocates, a packing as a seal member is interposed between a cylinder body (also referred to as a case body) having the cylinder and the cylinder head. Yes. The packing is configured to have a certain shape formed by a mold, and is fitted between the cylinder body and the cylinder head during assembly.

Japanese Utility Model Publication No. 61-21886

  By the way, in recent years, instead of the above-described solid packing, packing other than solid (that is, non-solid packing) may be used. As the non-solid packing, a liquid or semi-solid (for example, paste or gel) packing is assumed. During assembly, the non-solid packing is applied so as to surround the cylinder opening exposed to the cylinder body along the surface of the cylinder head facing the cylinder body (in other words, the contact area with the cylinder body).

  However, when applying the non-solid packing, it is difficult to accurately apply the non-solid packing of a constant application amount along a preset application position. For this reason, the case where it shifts | deviates from an application position, for example, or the application quantity changes is assumed. In this case, depending on the degree of deviation from the application position, a part of the non-solid packing may protrude into the cylinder and enter during assembly.

  Furthermore, in the fluctuation | variation of application quantity, the case where a non-solid packing is applied excessively and the case where a non-solid packing is applied too little are assumed. In this case, depending on the degree of excessive application of the non-solid packing, there is a possibility that a part of the non-solid packing may protrude into and out of the cylinder. On the other hand, depending on the degree of undercoating of the non-solid packing, the non-solid packing is not applied so as to continuously surround the cylinder, and as a result, it becomes difficult to keep the airtightness in the cylinder constant. There is a risk that.

  An object of the present invention is to provide a technique for maintaining constant airtightness in a cylinder by accurately applying a non-solid packing having a constant application amount along a preset application position. .

  According to the embodiment, the cylinder head is opposed to the body end surface continuously extending so as to surround the cylinder opening exposed to the cylinder body, and in contact with the head end region in contact with the body end surface. And a groove portion provided along the head contact area and disposed so as to continuously surround the cylinder opening, and the groove section is configured by partially depressing the head contact area, and the head The narrowest region in the contact region is configured to pass through the central portion thereof.

The perspective view which shows the example of a specification of the air compressor which concerns on one Embodiment. Sectional drawing of the cylinder head which concerns on one Embodiment. Sectional drawing of the cylinder head which concerns on other embodiment. The top view which shows the structure of the groove part provided in the cylinder head along the application | coating position of a non-solid packing. Sectional drawing which follows the F5-F5 line | wire of FIG. The top view which shows the other structure of the groove part provided in the cylinder head along the application | coating position of a non-solid packing. Sectional drawing which follows the F7-F7 line | wire of FIG.

“Configuration of One Embodiment”
FIG. 1 is a perspective view showing the overall configuration of the air compressor 1 of the present embodiment, and FIG. 2 is a cross-sectional view of the compression mechanism 3 of the present embodiment provided in the air compressor 1.
As shown in FIGS. 1 to 2, the air compressor 1 of this embodiment includes a motor 2, a compression mechanism 3, and a pressure accumulation tank 4. The motor 2 and the compression mechanism 3 are connected by an endless belt 5, and the compression mechanism 3 and the pressure accumulation tank 4 are connected by a communication pipe 6. The compression mechanism 3 (cylinder head 7) is provided with an intake portion 7a and an exhaust portion 7b. The communication pipe 6 has one end connected to the exhaust part 7 b of the cylinder head 7 and the other end connected to the pressure accumulation tank 4. The pressure accumulation tank 4 is provided with a compressed air take-out part 4p. Further, the compression mechanism 3 includes a piston 9 that reciprocates along the inner wall of the cylinder 8 having a cylindrical shape, a crankshaft (not shown) connected to the endless belt 5, and a connecting rod that connects the piston 9 and the crankshaft. 10.

  1 to 2 show an air compressor 1 that is used for attaching / detaching a wheel nut 12 of a tire 11 as an application of the air compressor 1. In this case, a nut fastening pneumatic drill 14 is connected to the compressed air extraction portion 4p via a connection hose 13. Such use is merely an example, and is improved or changed according to the purpose of use of the air compressor 1 and other uses. For example, in the application shown in FIGS. 1 to 2, the short cylinder type compression mechanism 3 having one cylinder 8 is applied. Instead, a multi-cylinder type compression mechanism 3 having two or more cylinders 8 is used. You may apply.

  According to the above configuration, when the motor 2 is driven, the rotational motion of the motor 2 is transmitted to the compression mechanism 3 (that is, the crankshaft) by the endless belt 5 to rotate the crankshaft. At this time, the connecting rod 10 is swung following the rotation of the crankshaft, so that the piston 9 is reciprocated along the inner wall of the cylinder 8.

  Here, air is taken into the cylinder 8 from the intake portion 7 a of the cylinder head 7 by the forward movement of the piston 9. The air taken into the cylinder 8 is exhausted from the exhaust part 7 b of the cylinder head 7 while being compressed in the cylinder 8 by the backward operation of the piston 9, and is supplied to the pressure accumulation tank 4 through the communication pipe 6. By repeating such a reciprocating motion of the piston 9, the accumulator tank 4 stores compressed air corresponding to the application.

  In a state where compressed air is stored in the pressure accumulation tank 4, the operator sets the pneumatic drill 14 on the wheel nut 12 and turns on the pneumatic drill 14. At this time, for example, the wheel nut 12 is tightened by rotating the pneumatic drill 14 forward with compressed air, and as a result, the tire 11 can be attached to the vehicle body 15. On the other hand, by rotating the pneumatic drill 14 reversely with compressed air, the tightening of the wheel nut 12 is loosened. As a result, the tire 11 can be removed from the vehicle body 15.

"Compression mechanism 3"
FIG. 2 is a cross-sectional view showing the configuration of the compression mechanism 3. As shown in FIG. 2, the compression mechanism 3 is a so-called reciprocating type compression mechanism 3, and in addition to the cylinder 8, piston 9, crankshaft (not shown), and connecting rod 10, a cylinder body 16, And a cylinder head 7.

  The cylinder body 16 is formed of, for example, a material such as cast iron or aluminum alloy, and a hollow cylindrical cylinder 8 in which the piston 9 reciprocates is provided. On the other hand, on the outside of the cylinder body 16, a plurality of radiating fins 17 are arranged at equal intervals along the extending direction of the cylinder 8. A plurality of piston rings 9 a are fitted into the piston 9, thereby achieving air compressibility in the cylinder 8 and stability of reciprocating movement of the piston 9.

  Further, the cylinder body 16 has a circular cylinder opening 8 p that communicates with the cylindrical cylinder 8 and is exposed to the cylinder body 16. The cylinder body 16 is configured with a preset thickness so as to continuously surround the cylinder opening 8p and the cylinder 8. In this case, a hollow body end surface 16s is formed around the cylinder opening 8p, and the body end surface 16s extends continuously in the circumferential direction so as to surround the cylinder opening 8p. . The body end surface 16s is configured as a flat surface without unevenness.

  The body end face 16s is positioned to face a head contact area 25 of a cylinder head 7 to be described later during assembly. Then, in a state where the cylinder head 7 is attached to the cylinder body 16 by the fixing mechanism 20 described later, the head contact region 25 and the body end surface 16s are in close contact with each other without a gap.

  The entire cylinder head 7 is formed of a heat-resistant resin, including a head contact area 25 and a groove 26 described later. As the heat resistant resin, for example, a thermosetting resin such as a phenol resin or an epoxy resin, or a heat resistant composite resin such as a carbon fiber composite phenol resin can be applied.

  The cylinder head 7 is attached to the cylinder body 16 (specifically, the body end face 16s) so as to seal the cylinder 8 (specifically, the cylinder opening 8p). In order to realize such a mounting state, the cylinder head 7 has a head body 18, an intake / exhaust valve structure 19, and a fixing mechanism 20, and the intake / exhaust valve structure 19 has a head contact described later. A region 25 and a groove 26 are provided.

  The head main body 18 is configured to include the above-described intake portion 7a and exhaust portion 7b (see FIG. 1). The intake portion 7a is configured to penetrate the head main body 18, and can take air into the cylinder 8 from outside the machine. The exhaust part 7b is configured to penetrate the head main body 18, and can exhaust the compressed air compressed in the cylinder 8 to the outside of the machine. 2 to 3, as an example, a plurality of heat radiating fins 21 are provided on the surface of the cylinder head 7 (head body 18). However, the cylinder head 7 (head body 18) made of heat-resistant resin is difficult to transmit heat. Since it is difficult to warm, the heat radiating fins 21 are not necessarily required and may be omitted.

  FIG. 4 is a plan view showing the configuration of the groove 26 provided in the cylinder head 7. As shown in FIG. 4, the fixing mechanism 20 is configured by projecting four corners of the head main body 18 (that is, the cylinder head 7) including the intake / exhaust valve structure 19, and a fixing bolt (not shown) can be inserted therethrough. It has a fixing hole 20h. In this case, for example, in a state where the cylinder head 7 is placed on the cylinder body 16, the cylinder head 7 is sealed to the cylinder body 16 by sealing the cylinder 8 by fastening the fixing bolt to the cylinder body 16 through the fixing hole 20 h. 16 can be attached.

  The intake / exhaust valve structure 19 is interposed between the head body 18 and the cylinder body 16 in a state where the cylinder head 7 is attached to the cylinder body 16 by the fixing mechanism 20 described above. As an example in FIGS. 2 to 3, the head main body 18 and the intake / exhaust valve structure 19 are formed separately from each other and attached to each other. As a retrofit method, for example, the following two methods are assumed.

  In the first method, as shown in FIG. 2, a groove 22 (guide groove 22g) similar to a groove 26 (guide groove 26g) of an intake / exhaust valve structure 19 described later is provided in the head body 18. In this case, the groove portion 22 (guide groove 22g) for retrofitting is configured along the surface of the head body 18 that faces the intake / exhaust valve structure 19. Thus, the groove portion 22 (guide groove 22g) is provided along the region facing the body end surface 16s of the cylinder body 16 via the intake / exhaust valve structure 19, and continuously surrounds the cylinder 8. Be placed.

  In the second method, as shown in FIG. 3, a groove 22 (guide groove 22g) similar to a groove 26 (guide groove 26g) of an intake / exhaust valve structure 19 described later is provided in the intake / exhaust valve structure 19. In this case, the retrofit groove portion 22 (guide groove 22g) is formed on the opposite side of the groove portion 26 (guide groove 26g) of the intake / exhaust valve structure 19. Thus, like the groove portion 26 (guide groove 26g) of the intake / exhaust valve structure 19, the groove portion 22 (guide groove 22g) is provided along the region facing the body end surface 16s of the cylinder body 16 described above. 8 are arranged so as to surround continuously.

  Here, according to the first method and the second method described above, a liquid or semi-solid (for example, paste or gel) non-solid packing (not shown) is provided in the groove portion 22 (guide groove 22g) for retrofitting. Apply. Subsequently, the head body 18 and the intake / exhaust valve structure 19 are brought into contact with each other. At this time, the non-solid packing applied to the groove portion 22 (guide groove 22g) spreads across the gap between the head body 18 and the intake / exhaust valve structure 19. Thereby, the cylinder head 7 in which the head main body 18 and the intake / exhaust valve structure 19 are integrated with each other is realized.

  Further, as shown in FIG. 4, the intake / exhaust valve structure 19 includes an intake valve mechanism 23 and an exhaust valve mechanism 24, and the head contact region 25 and the groove 26 are provided in the intake / exhaust valve structure 19. It has been. As the intake valve mechanism 23 and the exhaust valve mechanism 24, although not particularly illustrated, for example, an open / close valve structure in which a valve body that can be opened only in one direction always closes the passage can be applied. In this case, at the time of intake, only the valve body of the intake valve mechanism 23 is opened by the air taken in from the intake portion 7a, so that the air is sent into the cylinder 8 through the passage from the opened valve body. It is. On the other hand, at the time of exhaust, only the valve body of the exhaust valve mechanism 24 is opened by the compressed air compressed in the cylinder 8, whereby the compressed air passes from the opened valve body through the passage to the exhaust part 7b. Sent out.

  The head contact region 25 and the groove 26 are disposed along the surface of the intake / exhaust valve structure 19 in the cylinder head 7 in which the head body 18 and the intake / exhaust valve structure 19 are integrated. The surface of the intake / exhaust valve structure 19 is a surface facing the body end surface 16s of the cylinder body 16 described above. Further, the head contact region 25 and the groove 26 are disposed along a portion of the intake / exhaust valve structure 19 that avoids the intake valve mechanism 23 and the exhaust valve mechanism 24.

  Here, the head contact region 25 is provided to face the body end surface 16s of the cylinder body 16, and contacts the body end surface 16s during assembly. In other words, the head contact region 25 extends continuously in the circumferential direction along the outside of the cylinder 8 in the cylinder head 7. In this case, the head contact area 25 has a rectangular outer contour that extends to the outer periphery of the cylinder 8 and is configured as a flat surface without irregularities.

  FIG. 4 is a plan view showing the arrangement of the grooves 26, and FIG. 5 is a cross-sectional view showing the configuration of the grooves 26. The groove portion 26 is provided along the head contact region 25 and is disposed so as to continuously surround the cylinder opening 8 p exposed to the cylinder body 16. The groove portion 26 is configured by partially denting the head contact region 25. As the depression method, for example, a specification for depression in an arc shape or a rectangular shape is assumed. In FIG. 5, as an example, the groove portion 26 is configured to be recessed in an arc shape.

  The amount of depression (depth) is, for example, the amount of liquid or semi-solid non-solid packing 27 applied to the groove 26, the size of the cylinder head 7 (the width of the head contact area 25), the cylinder Since it is set in accordance with the size of the body 16 (the width of the body end surface 16s), it is not particularly limited here. In short, when the non-solid packing 27 is applied along the groove 26, the depression amount (depth) of the groove 26 is set so that a part of the non-solid packing 27 protrudes from the head contact area 25. Good.

  Furthermore, the groove part 26 has at least one guide groove 26g. 4 to 5, as an example, one guide groove 26g is provided along the head contact region 25 so as to continuously surround the cylinder opening 8p. In this case, the groove portion 26 (guide groove 26g) is configured to pass through the central portion in the region 25p where the width of the head contact region 25 is the narrowest.

  Here, the narrowest region 25p is a region where the width of the portion extending outside the cylinder 8 is the smallest when viewed in the radial direction from the center of the circular cylinder 8 in a cross-sectional view, in other words, It can be defined as the region with the shortest length. In this case, the width and length of the portion extending outside the cylinder 8 when viewed in the radial direction from the center of the circular cylinder 8 in a cross-sectional view is constant in the head contact region 25 along the circumferential direction. A region 25p having the narrowest width is defined over the entire circumferential direction.

  4 to 5, as an example, four regions 25p having the narrowest width in the head contact region 25 are provided around the circular cylinder opening 8p at equal intervals along the circumferential direction. The groove 26 (guide groove 26g) is concentric with the center of the cylinder opening 8p along the head contact region 25. In this case, the center of the groove part 26 (guide groove 26g) is configured to pass through the center part of the four regions 25p having the narrowest width.

“Effects of one embodiment”
According to the present embodiment, when the groove portion 26 (guide groove 26g) is arranged along the application position set in advance in the head contact region 25, the groove portion passes through the central portion of the narrowest region 25p. 26 (guide groove 26g). In this case, in a state where the liquid or semi-solid non-solid packing 27 is applied along the groove 26 (guide groove 26g) (see FIG. 5), the non-solid packing 27 is guided by the groove 26 (guide groove 26g). Being held. Thereby, the non-solid packing 27 of a fixed application amount can be accurately applied along the preset application position (that is, the groove portion 26 (guide groove 26g)). In other words, the non-solid packing 27 is positioned so as to continuously surround the cylinder 8 along the head contact region 25 without being displaced from the application position or changing the application amount. Here, in a state where the cylinder head 7 is placed on the cylinder body 16, the cylinder head 7 is attached to the cylinder body 16 by the fixing mechanism 20. At this time, the non-solid packing 27 applied to the groove portion 26 (guide groove 26g) does not protrude into and out of the cylinder 8, and the cylinder head 7 (head contact region 25) and the cylinder body 16 (body end surface 16s) are mutually connected. It spreads all over the gap. Thus, in a state where the cylinder head 7 is attached to the cylinder body 16, the cylinder 8 is firmly sealed by the non-solid packing 27, so that the airtightness in the cylinder 8 is maintained constant.

  According to this embodiment, a heat resistant resin is applied as a molding material for the cylinder head 7. Thereby, the whole cylinder head 7 including the groove part 26 (guide groove 26g) can be manufactured with a metal mold | die. As a result, the precise groove 26 (guide groove 26g) can be formed in a short time and at a low cost as compared with the case where the cylinder head 7 is manufactured by casting, for example. Furthermore, the groove part 26 (guide groove 26g) can be formed in accordance with the optimum application amount when the non-solid packing 27 is applied.

"First modification"
In the above-described embodiment, in the configuration of the cylinder head 7, it is assumed that the head body 18 and the intake / exhaust valve structure 19 are separately formed and retrofitted to each other. In the molding process, the head body 18 and the intake / exhaust valve structure 19 may be integrally molded. In this case, it is only necessary to provide the groove portion 26 (guide groove 26g) in the head contact region 25.

"Second modification"
FIG. 6 is a plan view showing the arrangement of the groove portions 26 according to this modification, and FIG. 7 is a cross-sectional view showing the configuration of the groove portions 26 according to this modification. In the above-described embodiment, it is assumed that the groove portion 26 is configured by having one guide groove 26g. Instead, for example, as shown in FIGS. The groove portion 26 may be configured. In this case, both guide grooves 26g have the same shape and the amount of depression (depth), and are concentric with the center of the cylinder opening 8p along the head contact region 25. . In this case, the center between the two guide grooves 26g passes through the central portion of the four regions 25p having the narrowest width. According to this modification, the guide property and retention property of the liquid or semi-solid non-solid packing 27 can be improved by an amount corresponding to the increase in the guide groove 26g.

  As mentioned above, although one Embodiment and some modifications of this invention were demonstrated, these embodiment and modifications are shown as an example and are not intending limiting the range of invention. These embodiments and modifications can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Air compressor, 2 ... Motor, 3 ... Compression mechanism, 4 ... Accumulation tank, 5 ... Endless belt,
6 ... Communication pipe, 7 ... Cylinder head, 8 ... Cylinder, 16 ... Cylinder body,
18 ... Head body, 19 ... Intake / exhaust valve structure, 22 ... Groove, 22g ... Guide groove,
23 ... Intake valve mechanism, 24 ... Exhaust valve mechanism, 25 ... Head contact area, 26 ... Groove,
26 g: guide groove, 27: non-solid packing.

Claims (5)

A cylinder head having a cylinder in which a piston reciprocates, and a cylinder head that is connected to the cylinder and is attached so as to seal a cylinder opening exposed to the cylinder body,
The cylinder head is
A head contact region facing a body end surface continuously extending so as to surround the cylinder opening, and in contact with the body end surface during assembly;
A groove portion provided along the head contact area and disposed so as to continuously surround the cylinder opening,
The groove portion is configured by partially denting the head contact area, and in the narrowest area of the head contact area, the cylinder head is configured to pass through a central portion thereof. The cylinder head is
The head body,
An intake / exhaust valve structure interposed between the head body and the cylinder body,
The head body is
An intake section for taking air into the cylinder;
An exhaust part for exhausting the compressed air compressed in the cylinder,
The intake and exhaust valve structure is
An intake valve mechanism for sending air taken in from the intake section into the cylinder;
An exhaust valve mechanism for sending compressed air compressed in the cylinder toward the exhaust part,
The head contact area and the groove are disposed along a surface of the intake / exhaust valve structure that avoids the intake valve mechanism and the exhaust valve mechanism and that faces the end face of the body. The cylinder head according to claim 1. The groove includes at least one guide groove provided in the head contact region so as to continuously surround the cylinder opening.
The guide groove is coated with a liquid or semi-solid non-solid packing interposed between the head body and the cylinder body so as to seal the cylinder opening,
3. The cylinder according to claim 2, wherein the non-solid packing is positioned so as to continuously surround the cylinder opening along the head contact area in a state where the non-solid packing is applied to the guide groove. head.   The cylinder head according to any one of claims 1 to 3, wherein the cylinder head including the head contact area and the groove portion is entirely made of a heat resistant resin. A compression mechanism to which the cylinder head according to any one of claims 1 to 4 is applied;
A motor that reciprocates the piston along the cylinder by operating the compression mechanism;
A pressure accumulation tank for storing compressed air compressed by the compression mechanism;
An intake portion and an exhaust portion provided in the cylinder head,
The compression mechanism is
The piston;
The cylinder head;
The cylinder body with the body end face positioned opposite to the head contact area during assembly;
The cylinder body, the cylinder in which the piston reciprocates,
Air is taken into the cylinder from the intake portion of the cylinder head by the forward movement of the piston, and the air taken into the cylinder is compressed in the cylinder by the backward movement of the piston. An air compressor exhausted from the exhaust part of the head and stored in the pressure accumulating tank.

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