CN217097625U - Nail gun - Google Patents

Abstract

The utility model discloses a nail gun, which comprises a shell, a firing component, a cartridge clip component and a cylinder, wherein at least part of the cylinder is arranged in the shell, and the cylinder is provided with a cylinder cavity for storing gas; the cylinder includes: a cylinder extending in a first axial direction; a cylinder head disposed at a first end of the cylinder block; the cylinder cover comprises an inflating nozzle and a sealing part, and the inflating nozzle is used for inflating the cylinder cavity; the sealing part is mounted on the cylinder body in a linear motion mode along the first axial direction; the sealing part is partially overlapped with the first end of the cylinder body along the first axial direction; at the overlapping portion of the cylinder body and the seal portion, a first surface of the seal portion is disposed opposite to a second surface of the cylinder body; at least one of the first surface of the sealing part and the second surface of the cylinder body is a non-threaded surface; and the first sealing element is arranged between the first surface of the sealing part and the second surface of the cylinder body so that the cylinder body and the sealing part form a sealing connection. The cylinder of the nail gun is stable in sealing and good in sealing effect.

Description

Nail gun

Technical Field

The utility model relates to an electric tool, concretely relates to nail rifle.

Background

The nail gun is used as a nailing tool, and the principle mode of the existing nail gun products on the market can be divided into two mechanical types and a cylinder type, wherein the mechanical type can be divided into structures such as a spring type, a flywheel type, a friction wheel type and the like according to the energy storage mode; the cylinder type nail gun can be divided into a single cylinder or a double-cylinder structure according to the number of cylinders, and can be divided into positive pressure energy storage or negative pressure energy storage according to an energy storage mode.

During installation and use of the cylinder type nail gun, the thickness of a sealing part for sealing the cylinder becomes uneven due to structural deformation, so that the problem of poor sealing or even direct failure easily occurs at the position of the thinned thickness due to the structural deformation. It can lead to the reduction of the striking force of the nail gun and the low working efficiency until the whole nail gun fails.

SUMMERY OF THE UTILITY MODEL

For solving the deficiencies of the prior art, an object of the utility model is to provide a better nail rifle of cylinder seal effect.

In order to realize the goal, the utility model adopts the following technical scheme:

a nail gun, comprising: a housing formed with an accommodating space; the cylinder is at least partially arranged in the shell and provided with a cylinder cavity for storing gas; a cartridge clip assembly for storing nails; a firing assembly for striking a nail and disposed at least partially within the cylinder; the cylinder includes: a cylinder extending in a first axial direction; a cylinder head disposed at a first end of the cylinder block; the cylinder cover comprises an inflating nozzle and a sealing part, and the inflating nozzle is used for inflating the cylinder cavity; the sealing part is arranged on the cylinder body along the first axial direction; the sealing part is partially overlapped with the first end of the cylinder body along the first axial direction; at the overlapping part of the cylinder body and the sealing part, a first surface arranged on the sealing part is opposite to a second surface arranged on the cylinder body; wherein at least one of the first surface of the sealing portion and the second surface of the cylinder body is a non-threaded surface; and the first sealing element is arranged between the first surface of the sealing part and the second surface of the cylinder body so that the cylinder body and the sealing part form a sealing connection.

In some embodiments, the cylinder further includes a limiting mechanism, the limiting mechanism includes a first limiting portion disposed on the cylinder head and a second limiting portion disposed on the cylinder body, and the first limiting portion and the second limiting portion are cooperatively disposed to limit the sealing portion from rotating relative to the first end.

In some embodiments, the cylinder further comprises a fastening mechanism connecting the cylinder block and the cylinder head.

In some embodiments, the seal portion comprises: the protruding portion that lid and outstanding lid lower surface set up, the protruding portion stretches into the first end of cylinder body, and the surface of protruding portion is provided with first annular along circumference, and first sealing member sets up in first annular.

In some embodiments, the seal portion comprises: the cover body and the surrounding part arranged around the edge of the cover body form a cover body accommodating cavity, the first end of the cylinder body is inserted into the cover body accommodating cavity, a first annular groove is arranged along the circumferential direction around one side in the cover body accommodating cavity, and a first sealing element is arranged in the first annular groove.

In some embodiments, the fastening mechanism comprises: the cylinder cover comprises a threaded column provided with an external thread and a fastening ring provided with an internal thread, wherein the threaded column is at least arranged on the outer peripheral surface of one of the cylinder cover and the cylinder body, and the fastening ring is sleeved on the outer sides of the cylinder cover and the cylinder body and is detachably arranged with the threaded column.

In some embodiments, a second seal is further disposed between the protrusion and the first end of the cylinder, the second seal being disposed on a side of the first seal away from the first end.

In some embodiments, the firing assembly comprises: a striker for striking a nail; the piston is fixedly connected to the firing pin and positioned in the cylinder body, and gas in the cylinder body can push the piston to drive the firing pin; the buffer piece is connected to the second end of the cylinder body, and the second end and the first end are arranged on two sides of the cylinder body oppositely.

In some embodiments, the piston, cylinder block, and cylinder head form a cylinder chamber, wherein the cylinder chamber has a uniform or decreasing inner diameter in a direction from the piston end to the cylinder head end.

A nail gun, comprising: a housing formed with an accommodating space; the cylinder is at least partially arranged in the shell and provided with a cylinder cavity for storing gas; a cartridge clip assembly for storing nails; a firing assembly for striking a nail and disposed at least partially within the cylinder; the cylinder includes: a cylinder extending in a first axial direction; a cylinder head disposed at a first end of the cylinder block; the cylinder cover comprises an inflating nozzle and a sealing part, and the inflating nozzle is used for inflating the cylinder cavity; the sealing part is arranged on the cylinder body along the first axial direction; the sealing part is partially overlapped with the first end of the cylinder body along the first axial direction; at the overlapping part of the cylinder body and the sealing part, a first surface arranged on the sealing part is opposite to a second surface arranged on the cylinder body; wherein at least one of the first surface of the sealing portion and the second surface of the cylinder is a non-threaded surface.

The utility model has the advantages that: the cylinder of the nail gun is stable in sealing and good in sealing effect, the working efficiency of the nail gun is improved, and the service life of the nail gun is prolonged.

Drawings

FIG. 1 is a perspective view of a nail gun;

FIG. 2 is a cross-sectional view of the staple gun of FIG. 1;

FIG. 3 is a perspective view of the cylinder and firing assembly;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a schematic perspective view of the partial explosion of FIG. 3;

FIG. 6 is a schematic front view of FIG. 5;

FIG. 7 is a cross-sectional view of FIG. 6;

FIG. 8 is a cross-sectional view of a second embodiment of a cylinder;

FIG. 9 is a perspective view of a third embodiment of a cylinder;

FIG. 10 is a perspective view of a fourth embodiment of a cylinder;

FIG. 11 is a cross-sectional view of a fourth embodiment of a cylinder;

FIG. 12 is a perspective view of a fifth embodiment of the cylinder;

fig. 13 is a sectional view of a sixth embodiment of the cylinder.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and 2, a nail gun 100 according to a first embodiment of the present invention includes: a housing 11, a power take-off 12, a cylinder 13 and a cartridge assembly 14. The housing 11 includes a first accommodating space 111 formed to extend in the first axis 101 direction and a second accommodating space 112 extending in the second axis 102 direction, and the power output portion 12 is disposed in the second accommodating space 112. The housing 11 is also formed with a grip portion 113 that can be gripped by a user. One end of the handle portion 113 is connected to a power interface for receiving a dc or ac power. The handle portion 113 is provided with a main switch 114, and the user controls the on/off of the nail gun 100 through the main switch 114. In the present embodiment, a battery pack is connected to the power source interface. The other end of the handle part 113 is connected with the cylinder 13; the cylinder 13 is disposed in the first receiving space 111, and a cylinder chamber 130 for storing gas is disposed in the cylinder 13. The cylinder 13 extends in the direction of the first axis 101. In the present embodiment, the second axis 102 is perpendicular to the first axis 101. The clip assembly 14 is disposed in a third axis 103 direction parallel to the second axis 102. The cartridge clip assembly 14 is adapted to receive a staple and is coupled to the firing assembly 15. The cylinder 13 is provided with a firing assembly 15, a user loads nails into the cartridge clip assembly 14, the pre-charging gas in the cylinder 13 is compressed by the firing assembly 15, the pre-charging gas does work, and the firing assembly 15 is pushed to move to eject the nails.

Referring to FIGS. 1-3, in the present embodiment, the firing assembly 15 includes a firing pin 151, a piston 152, and a bumper 153. The striker 151 and the piston 152 form a fixed connection, both of which move in the direction of the first axis 101 within the cylinder 13. The buffer 153 is sleeved on the striker 151 and installed at an outlet of the cylinder 13.

Referring to fig. 1-7, the cylinder 13 includes a block 131, a cylinder head 132, and a first seal 133. The cylinder 131 extends along the first axis 101; the cylinder 131 comprises a first end 1311 and a second end 1312, wherein the first end 1311 is an open end of the upper end of the cylinder; the second end 1312 is an open end of the underside of the cylinder. The cylinder head 132 is disposed on the first end 1311; the piston 152 extends into the cylinder 131 from the second end 1312 and performs a movement, in particular a piston movement, in the direction of the first axis 101 within the cylinder 131. The buffer 153 is mounted on the second end of the cylinder 131. The piston 152, the cylinder block 131 and the cylinder head 132 form a cylinder chamber 130, the volume of the cylinder chamber 130 changes along with the movement of the piston 152, and specifically, the piston 152 compresses the pre-charged gas in the cylinder chamber 130, so that the pre-charged gas performs work. The cylinder chamber 130 has a uniform or reduced inner diameter from the piston end to the cylinder head end, and in fact, when the cylinder head 132 and the cylinder block 131 are mounted, a spliced portion is formed, and due to manufacturing tolerance, seamless connection is difficult to form at the spliced portion, so that the spliced portion of the cylinder head 132 and the cylinder block 131 in the cylinder chamber 130 is in a retraction type fit in the cylinder chamber 130.

Among other things, the cylinder head 132 includes a plenum and a seal 1322. The inflating part is provided with an inflating nozzle 1321 for inflating pre-charging gas into the cylinder cavity 130, and the sealing part 1322 is used for connecting with the cylinder body 131. Specifically, the sealing portion 1322 is mounted at the first end 1311 of the cylinder block 131, and the sealing portion 1322 moves linearly in the direction of the first axis 101 until the sealing portion 1322 and the first end 1311 partially coincide with each other in the direction of the first axis 101, that is, at least one straight line perpendicular to the first axis 101 passes through both the sealing portion 1322 and the first end 1311, so that the sealing connection is stable, and the sealing between the cylinder block and the cylinder head is not easily lost even under a vibration use environment during use.

In the present embodiment, the sealing portion 1322 includes a cover 1323 and a projection 1324. The protrusion 1324 is provided to protrude from the lower surface of the cover 1323, the first end 1311 of the cylinder 131 is provided with the receiving groove 1313, the protrusion 1324 completely protrudes into the receiving groove 1313, the outer peripheral surface 1324a of the protrusion 1324 is set to be the first surface of the sealing portion, and the inner side surface 1313a of the receiving groove 1313 is set to be the second surface of the cylinder. The outer peripheral surface 1324a and the inner side surface 1313a are disposed opposite to each other, and at least one of the outer peripheral surface 1324a and the inner side surface 1313a is a non-threaded surface, in this embodiment, both the outer peripheral surface 1324a and the inner side surface 1313a are non-threaded surfaces, that is, a structure formed by continuous convex portions having a spiral shape and a specific cross section is not present on the first surface of the sealing part or the second surface of the cylinder, in this embodiment, the surfaces of the outer peripheral surface 1324a and the inner side surface 1313a, and preferably, the inner side surface 1313a is smooth.

And a first sealing member 133 disposed between the first surface of the sealing portion and the second surface of the cylinder body to constitute a sealing connection between the cylinder body 131 and the sealing portion 1322. In the present embodiment, the first sealing member 133 is made of a soft material, preferably, rubber or silicone. The first sealing member 133 is a sealing ring having a thickness, and the first sealing member 133 is fitted over the outer circumferential surface 1324a of the protrusion 1324 and inserted into the first-end 1311-provided accommodation groove 1313 together with the protrusion 1324. Since the fitting of the cylinder 131 and the protrusion 1324 has a tolerance, in order to allow the cylinder 131 and the protrusion 1324 to be assembled, a gap is provided between the cylinder 131 and the protrusion 1324, and the thickness of the first seal 133 is larger than the gap, that is, after the first seal 133 is fitted over the outer circumferential surface 1324a of the protrusion 1324, the outer circumferential diameter of the first seal 133 is larger than the inner diameter of the receiving groove 1313, so that the first seal 133 seals the cylinder 131 and the protrusion 1324.

To prevent the first seal member 133 from being displaced along the first axis during installation and use, the outer peripheral surface 1324a of the protrusion 1324 is circumferentially provided with a first ring groove 1325, and the first seal member 133 is disposed in the first ring groove 1325.

In the present embodiment, the outer peripheral surface 1324a of the protrusion 1324 is also provided with a second annular groove 1326 in the circumferential direction, and preferably, the second annular groove 1326 is opened below the first annular groove 1325. A second sealing member 137 is disposed in the second annular groove 1326, and preferably, the second sealing member 137 is made of a soft material, preferably, rubber or silicone. The second seal 137 is a seal ring having a thickness. The second seal 137 serves to reinforce the sealing effect of the first seal 133 against the cylinder block 131 and the cylinder head 132.

Referring to fig. 5-7, during the installation of the cylinder head 132 and the block 131, the first and second seals 133, 137 are first installed in the first and second annular grooves 1325, 1326; after the protrusion 1324 with the first and second seals 133 and 137 is initially inserted into the cylinder block 131, the cylinder head 132 is inserted into the receiving groove 1313 of the cylinder block 131 in a linearly pushing manner. The outer peripheral surface 1324a and the inner side surface 1313a are both non-threaded surfaces, preferably, the inner side surface 1313a is smooth, and therefore the situation that the first sealing piece 133 rotates along with the cylinder body 131 due to the fact that threads need to rotate in the installation process is avoided, the first sealing piece 133 is subjected to friction extrusion to generate torsional deformation, the thickness of the first sealing piece 133 arranged between the cylinder head 132 and the cylinder body 131 is uneven, and sealing performance is affected.

Referring to fig. 5-7, the cylinder further includes a limiting mechanism, which includes a first limiting portion disposed on the cylinder head 132 and a second limiting portion disposed on the cylinder body 131, specifically, the first limiting portion is a first notch 1341 on the outer surface of the cylinder head 132, and the second limiting portion is a second notch 1342 on the outer surface of the cylinder body 131. The first notch 1341 and the second notch 1342 are disposed along the direction of the first axis 101, and the center lines of the first notch 1341 and the second notch 1342 in the direction of the first axis 101 are collinear. During installation, the centerlines of first notch 1341 and second notch 1342 are always substantially collinear, either by the operator or using a mating tool, thereby limiting rotation of tab 1324 relative to first end 1311.

Referring to fig. 3-7, the cylinder further includes a fastening mechanism 135 that connects the cylinder block 131 and the cylinder head 132. Wherein, the outer circumferential surface of the first end of the cylinder body 131 is provided with an external thread 1351. The fastening ring 1352 is provided with a fastening portion 1352a and a boss portion 1352 b. The retainer 1352a extends in the direction of the first axis 101, the retainer 1352a surrounds an outer circumference of the first end 1311 of the cylinder 131, and the retainer 1352a is provided with a female thread to be fitted with the male thread 1351. Boss 1352b is above retainer portion 1352a, boss 1352b extends inwardly in a direction perpendicular to first axis 101, and boss 1352b engages with an upper surface portion of cover 1323 to stop cylinder head 132 from moving off of cylinder block 131 in the direction of first axis 101, preventing cylinder head 132 from moving off of cylinder block 131 in the direction of first axis 101.

As another alternative embodiment of the cylinder, as shown in fig. 8, the second seal 237 is provided at the root of the receiving groove 2313 of the cylinder block 231, the bottom of the protrusion 2324 of the cylinder head 232 is provided with a slope, and the second seal 237 is pressed against the root of the receiving groove 2313 by the slope of the bottom of the protrusion 2324, thereby forming a seal.

Referring to fig. 9, as a third alternative embodiment of the cylinder, the fastening mechanism includes a threaded post provided with an internal thread and a fastener provided with an external thread; in the present embodiment, the threaded columns include a first threaded column 3353a disposed on the outside of the cylinder head 332 and a second threaded column 3353b disposed on the outer periphery of the first end 3311 of the cylinder block 331, respectively; the first threaded column 3353a and the second threaded column 3353b are arranged in a matching manner, and the first threaded column 3353a and the second threaded column 3353b are provided with internal threaded holes communicated with each other. The fastener is a bolt 3354; the cylinder head 332 and the cylinder block 331 are coupled to each other by a bolt 3354 through a first threaded post 3353a and a second threaded post 3353b, and preferably, a plurality of bolts 3354, a plurality of first threaded posts 3353a, and a plurality of second threaded posts 3353b are provided to ensure stable coupling and prevent the cylinder head 332 and the cylinder block 331 from being rotated and separated from each other during use.

Referring to fig. 10-11, as a fourth alternative embodiment of the cylinder, the sealing portion includes a cover 4323 and a surrounding portion 4327, the surrounding portion 4327 is disposed around the edge of the cover 4323, and the surrounding portion 4327 and the cover 4323 are configured to form a cover receiving cavity 4328. The first end 4311 of the cylinder 431 is inserted into the cap receiving chamber 4328, the inner surface 4327a of the surrounding portion 4327 is a first surface of the sealing portion, the outer circumferential surface 4311a of a portion of the first end 4311 of the cylinder 431 inserted into the cap receiving chamber 4328 is a second surface of the cylinder, the inner surface 4327a and the outer circumferential surface 4311a are disposed opposite to each other, and both the inner surface 4327a and the outer circumferential surface 4311a are non-threaded surfaces, preferably, the outer circumferential surface 4311a is smooth. First seal 433 is disposed between inner side surface 4327a and outer peripheral surface 4311 a. The inner side surface 4327a is circumferentially provided with a first ring groove 4325, and the first seal 433 is disposed in the first ring groove 4325.

The fastening mechanism 435 includes a threaded post provided with internal threads and a fastener provided with external threads. In the present embodiment, the threaded columns include a first threaded column 4353a disposed on the outer side of the cylinder head 432 and a second threaded column 4353b disposed on the outer periphery of the first end 4311 of the cylinder block 431, respectively. The first threaded column 4353a and the second threaded column 4353b are arranged in a matching manner, and the first threaded column 4353a and the second threaded column 4353b are provided with internal threaded holes communicated with each other. The fastening member is a bolt 4354, the cylinder head 432 and the cylinder body 431 are connected by a bolt 4354 through a first threaded column 4353a and a second threaded column 4353b, preferably, the bolt 4354, the first threaded column 4353a and the second threaded column 4353b are correspondingly arranged in plurality, so that the connection stability is ensured, and the cylinder head 432 and the cylinder body 431 are prevented from rotating relatively and being separated in the using process.

Referring to fig. 12, as a fifth alternative embodiment of the cylinder, the fastening mechanism includes pin holes 5355, where the pin holes include a first pin hole and a second pin hole, which are respectively opened on the surrounding portion 5327 and the cylinder body 531, the first pin hole and the second pin hole are communicated with each other, the pin shafts are respectively inserted into the first pin hole and the second pin hole, and the pin shafts are in interference fit with the first pin hole and the second pin hole to prevent the cylinder head 532 from being separated from the cylinder body 531 along the first axis 101.

Referring to fig. 13, as a sixth alternative embodiment, the fastening mechanism includes a collar 6356, in this embodiment, the surrounding portion 6327 and the cover 6323 are configured as a cover receiving cavity. The first end 6311 of the cylinder 631 is inserted into the cover accommodating cavity, the collar 6356 is sleeved on the outer side wall of the first end 6311, the inner side surface of the surrounding portion 6327 is circumferentially provided with a clamping groove 6357, the clamping groove 6357 is matched with the collar 6356, and the clamping groove 6357 and the collar 6356 form an undetachable connection.

A first ring groove 6325 is provided circumferentially around the inner side surface of the portion 6327, and the first seal 633 is disposed in the first ring groove 6325. Preferably, a second ring groove 6326 is circumferentially provided around the inner side surface of the surrounding portion 6327, and preferably, the second ring groove 6326 opens below the first ring groove 6325. A second seal 637 is provided in the second annular groove 6326. The first ring groove 6325 and the second ring groove 6326 are both disposed above the locking groove 6357.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (10)

1. A nail gun, comprising:

a housing formed with an accommodating space;

the cylinder is at least partially arranged in the shell and provided with a cylinder cavity for storing gas;

a cartridge clip assembly for storing nails;

a firing assembly for striking a nail and disposed at least partially within the cylinder;

characterized in that the cylinder comprises:

a cylinder extending in a first axial direction;

a cylinder head disposed at a first end of the cylinder block; the cylinder cover comprises an inflating nozzle and a sealing part, and the inflating nozzle is used for inflating the cylinder cavity; the seal portion is attached to the cylinder block in the first axial direction; the sealing part is partially overlapped with the first end of the cylinder body along the first axial direction; at the overlapping part of the cylinder body and the sealing part, a first surface arranged on the sealing part is opposite to a second surface arranged on the cylinder body; wherein at least one of the first surface of the sealing portion and the second surface of the cylinder block is a non-threaded surface;

a first sealing member disposed between a first surface of the sealing portion and a second surface of the cylinder body to constitute a sealing connection between the cylinder body and the sealing portion.

2. The nailer of claim 1, wherein the cylinder further includes a stop mechanism including a first stop portion disposed on the cylinder head and a second stop portion disposed on the cylinder body, the first stop portion and the second stop portion cooperatively disposed to limit rotation of the seal portion relative to the first end.

3. The nailer of claim 1, wherein the cylinder further includes a fastening mechanism connecting the block and the cylinder head.

4. The nail gun of claim 1, wherein the sealing portion comprises: lid and salient the protruding portion that the lid lower surface set up, the protruding portion stretches into in the first end of cylinder body, the surface of protruding portion is provided with first annular along circumference, first sealing member sets up in the first annular.

5. The nail gun of claim 1, wherein the sealing portion comprises: the cover body and around the portion of enclosing that the lid edge set up, enclose the portion with the lid forms the lid and holds the chamber, the first end of cylinder body is inserted in the lid holds the chamber, it is located to enclose the position the lid holds one side in the chamber and is provided with first annular along circumference, first sealing member sets up in the first annular.

6. The nail gun of claim 3, wherein the fastening mechanism comprises: the cylinder cover comprises a threaded column provided with an external thread and a fastening ring provided with an internal thread, wherein the threaded column is at least arranged on the outer peripheral surface of one of the cylinder cover and the cylinder body, and the fastening ring is sleeved on the outer sides of the cylinder cover and the cylinder body and is detachably arranged with the threaded column.

7. The nailer of claim 4, further including a second seal disposed between the tab and the first end of the cylinder, the second seal being disposed on a side of the first seal remote from the first end.

8. The nail gun of claim 1, wherein the firing assembly comprises: a striker for striking a nail; a piston fixedly connected to the striker and positioned within the cylinder, wherein gas within the cylinder is capable of propelling the piston to drive the striker; the buffer piece is connected to the second end of the cylinder body, and the second end and the first end are arranged on two sides of the cylinder body oppositely.

9. The nailer of claim 8, wherein the piston, the cylinder block, and the cylinder head define the cylinder chamber, and wherein the cylinder chamber has a uniform or decreasing inner diameter in a direction from the piston end to the cylinder head end.

10. A nail gun, comprising:

a housing formed with an accommodating space;

the cylinder is at least partially arranged in the shell and provided with a cylinder cavity for storing gas;

a cartridge clip assembly for storing nails;

a firing assembly for striking a nail and disposed at least partially within the cylinder;

characterized in that the cylinder comprises:

a cylinder extending in a first axial direction;

a cylinder head disposed at a first end of the cylinder block; the cylinder cover comprises an inflating nozzle and a sealing part, and the inflating nozzle is used for inflating the cylinder cavity; the seal portion is attached to the cylinder block in the first axial direction; the sealing part is partially overlapped with the first end of the cylinder body along the first axial direction; at the overlapping part of the cylinder body and the sealing part, a first surface arranged on the sealing part is opposite to a second surface arranged on the cylinder body; wherein at least one of the first surface of the sealing portion and the second surface of the cylinder block is a non-threaded surface.

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