Piston assembly for nail gun, energy storage mechanism and nail gun

Abstract

The utility model provides a piston assembly for a nail gun, an energy storage mechanism and the nail gun, the piston assembly comprises a piston main body and a plurality of piston rings, the plurality of piston rings comprise an elastic sealing ring and one or more guide rings, and when the piston main body is not assembled in an air cylinder, the outer diameter of the elastic sealing ring is larger than the inner diameter of the air cylinder; therefore, when the elastic sealing ring is assembled in the air cylinder, the inner wall of the air cylinder extrudes the elastic sealing ring, the radial width of the elastic sealing ring is reduced, the overall outer diameter of the elastic sealing ring is reduced, and the axial width of the elastic sealing ring is increased, so that a plurality of piston rings mounted in the annular mounting groove can be tightly pressed by utilizing elastic deformation of the elastic sealing ring to form a stable overall structure. Compared with a piston with a plurality of separated mounting grooves, the piston assembly has the advantages that the axial length of the piston assembly is smaller, so that the utilization rate of the inner cavity of the air cylinder is higher, and the piston body is more convenient to manufacture and process and lower in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of nail gun components, and particularly relates to a piston assembly for a nail gun, an energy storage mechanism and a nail gun. Background Art

[0002] A nail gun is a commonly used fastening tool, which can be classified into multiple types according to its power mode. One type is a pneumatic nail gun, in which a cylinder and a piston assembly are provided, and the piston assembly drives a striker component to move to fire a nail.

[0003] Figure 15 The structure of the cylinder and the piston assembly in a prior art cylinder nail gun is shown. The piston 1 is generally in a cylindrical cap shape as a whole and is movably embedded in the cylinder 2. One end of the piston is fixed to the striker component 5 and is used to drive the striker component 5 to move. Multiple mutually spaced mounting grooves are provided on the outer periphery of the piston 1. A sealing ring 3 is embedded in the middle mounting groove, and the sealing ring 3 is in interference fit with the cylinder 2. Two guide rings 4 are respectively embedded in the mounting grooves on both sides. Among them, the effect of sealing gas is mainly achieved through the sealing ring 3. The guide rings 4 play a guiding role during the movement of the piston 1 and also play an auxiliary sealing effect. Such a piston assembly structure still has many deficiencies and needs to be improved urgently:

[0004] On the one hand, since multiple mounting grooves are spaced, the spaced distance causes an increase in the overall axial length of the piston 1 and a reduction in the utilization rate of the inner cavity of the cylinder 2.

[0005] On the other hand, during the reciprocating movement of the piston 1 and the process of the nail gun firing a nail, the front section of the striker component 5 is stressed, which will cause the axis of the striker component 5 to deviate from the axis of the cylinder 2 by 1° to 3°. Therefore, the guide rings 4 will be worn during this process. After a certain amount of wear, the periphery of the piston 1 will directly rub against the inner wall of the cylinder 2, causing it to be damaged (scratched). After the inner wall of the damaged cylinder and the sealing ring 3 cannot play a sealing role, the cylinder 2 leaks air, and finally the nail gun cannot be used. Summary of the Utility Model

[0006] The utility model is made to solve the above problems, and aims to provide a piston assembly and a corresponding nail gun with a more compact structure and a longer service life. The utility model adopts the following technical solutions:

[0007] The utility model provides a piston assembly for a nail gun, which is arranged in the cylinder of the nail gun and is used to drive the striker component to move to fire nails. The piston assembly for the nail gun has the following technical features. It includes: a piston body, with one axial end connected to the striker component and having an annular mounting groove; and a plurality of piston rings, which are respectively sleeved in the annular mounting groove and arranged in sequence along the axial direction of the piston body, and all are in contact with the inner wall of the cylinder. Among them, the plurality of piston rings include an elastic sealing ring and one or more guiding rings. When not assembled into the cylinder, the outer diameter of the elastic sealing ring is greater than the inner diameter of the cylinder. When assembled in the cylinder, all the piston rings are in contact with each other, and the outermost piston ring is in contact with the groove wall of the annular mounting groove.

[0008] The piston assembly for the nail gun provided by the utility model may also have the following technical feature. Among them, the elastic sealing ring is a rubber ring with a star-shaped cross-section, and the guiding ring is a Teflon ring with a truncated rectangular cross-section, and the size of its outer peripheral surface is smaller than that of its inner peripheral surface.

[0009] The piston assembly for the nail gun provided by the utility model may also have the following technical feature. Among them, there are two guiding rings, which are respectively arranged on both sides of the elastic sealing ring. The guiding ring has two axial side surfaces in a circular ring shape, and one of the axial side surfaces with a larger area faces the elastic sealing ring. When not assembled into the cylinder, the outer diameter of the elastic sealing ring is greater than the outer diameter of the guiding ring.

[0010] The piston assembly for the nail gun provided by the utility model may also have the following technical feature. Among them, the two guiding rings are respectively a first guiding ring and a second guiding ring. The circumferential cross-sectional dimension of the first guiding ring is smaller than that of the second guiding ring. One side of the bottom of the annular mounting groove has a protrusion. A first groove part is formed on one side of the protrusion, and a second groove part is formed above the protrusion. The first guiding ring is arranged in the second groove part, and the radial width of the first guiding ring is greater than the groove depth of the second groove part. The elastic sealing ring and the second guiding ring are arranged in the first groove part, and the elastic sealing ring is close to the protrusion. The radial widths of both the elastic sealing ring and the second guiding ring are greater than the groove depth of the first groove part.

[0011] The piston assembly for the nail gun provided by the utility model may also have the following technical feature. Among them, the annular mounting groove is arranged in the middle of the piston body in the axial direction, and the diameters of both ends of the piston body in the axial direction are smaller than the inner diameter of the cylinder.

[0012] The piston assembly for a nail gun provided by the present utility model may further have the following technical feature: the elastic sealing ring and the first guiding ring are closed rings, and the second guiding ring has an opening.

[0013] The piston assembly for a nail gun provided by the present utility model may further have the following technical feature: the tail end of the firing pin component has a cylindrical part and a conical protruding part, and the middle part of the piston body has a firing pin component fixing groove matching with the cylindrical part for fitting with the cylindrical part, so as to fixedly connect the piston body and the firing pin component.

[0014] The piston assembly for a nail gun provided by the present utility model may further have the following technical feature: the tail end of the firing pin component is plate-shaped and has a fixing hole, one axial end of the piston body has a firing pin component installation groove matching with the tail end and a pair of pin holes communicating with the firing pin component installation groove, the firing pin component installation groove is used for fitting with the tail end, and the pin holes are used for arranging fixing pins passing through the fixing hole, so as to fixedly connect the piston body and the firing pin component.

[0015] The present utility model provides an energy storage mechanism, which is arranged in a nail gun having a firing pin component. The energy storage mechanism has the following technical feature: it includes a cylinder; and the above-mentioned piston assembly, which is movably and airtightly fitted in the inner cavity of the cylinder for driving the firing pin component to move.

[0016] The present utility model provides a nail gun, which has the following technical feature: it includes a firing pin component; and the above-mentioned energy storage mechanism for energy storage and driving the firing pin component to move, so that the firing pin component strikes a nail.

[0017] Functions and effects of the utility model

[0018] The piston assembly, energy storage mechanism and nail gun according to the present utility model. The piston assembly includes a piston body and a plurality of piston rings. Among the plurality of piston rings, there is an elastic sealing ring and one or more guiding rings. Since the outer diameter of the elastic sealing ring is greater than the inner diameter of the cylinder when not assembled into the cylinder, when assembled into the cylinder, the inner wall of the cylinder squeezes the elastic sealing ring, causing the radial width of the elastic sealing ring to become smaller, the overall outer diameter to become smaller, and the axial width to become larger. Thus, the elastic deformation of the elastic sealing ring can be used to press the plurality of piston rings installed in the annular installation groove, forming a stable overall structure. In this way, the piston body only needs to be provided with one annular installation groove. Since the piston body only has one annular installation groove and all piston rings are installed in this annular installation groove, compared with a piston having a plurality of separated installation grooves, the axial length of this piston assembly is smaller, making the utilization rate of the inner cavity of the cylinder higher, and also making the manufacturing and processing of the piston body more convenient and the cost lower. Description of the Drawings

[0019] Figure 1 is a perspective view of a partial structure of the nail gun in Embodiment 1 of the present utility model;

[0020] Figure 2 is a cross-sectional view of a partial structure of the nail gun in Embodiment 1 of the present utility model;

[0021] Figure 3 is a perspective view of the striker component in Embodiment 1 of the present utility model;

[0022] Figure 4 is a perspective view of the piston assembly in Embodiment 1 of the present utility model;

[0023] Figure 5 is an exploded view of the structure of the piston assembly in Embodiment 1 of the present utility model;

[0024] Figure 6 is a cross-sectional view of the piston assembly in Embodiment 1 of the present utility model;

[0025] Figure 7 is a side view of the piston body in Embodiment 1 of the present utility model;

[0026] Figure 8 is a cross-sectional view of the piston body in Embodiment 1 of the present utility model;

[0027] Figure 9 is Figure 6 an enlarged view of the part inside the middle frame A;

[0028] Figure 10 is a cross-sectional view of the piston assembly and the striker component in Embodiment 1 of the present utility model;

[0029] Figure 11It is a three-dimensional view of the striker component in the second embodiment of the present utility model;

[0030] Figure 12 It is a three-dimensional view of the piston assembly in the second embodiment of the present utility model;

[0031] Figure 13 It is a cross-sectional view of the piston assembly in the second embodiment of the present utility model;

[0032] Figure 14 It is a cross-sectional view of the piston assembly and the striker component in the second embodiment of the present utility model;

[0033] Figure 15 It is a cross-sectional view of the cylinder and piston assembly of a nail gun in the prior art.

[0034] Reference numerals:

[0035] Nail gun 100; energy storage mechanism 10; housing 11; cylinder 12; inner cavity 121; piston assembly 13; piston body 131; cylinder mating portion 1311; support plate portion 13111; support ring portion 13112; flange portion 13113; annular mounting groove 13114; first groove portion 13114a; second groove portion 13114b; protrusion 13115; striker component fixing portion 1312; striker component fixing groove 1312a; front end portion 13121; rear end portion 13122; semi-cylindrical protrusion 13123; striker component mounting groove 13124; elastic sealing ring 132; first guide ring 133; second guide ring 134; opening 1341; nozzle 20; striker mechanism 30; striker rod 31; striker rod tail 311; cylindrical portion 3111; conical protruding portion 3112; fixing hole 311a; fixing pin 32. Detailed implementation manners

[0036] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the piston assembly, energy storage mechanism and nail gun of the present utility model will be specifically described below in conjunction with the embodiments and the accompanying drawings.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0038] <Embodiment 1>

[0039] This embodiment provides a piston assembly for a nail gun, which is arranged in the energy storage mechanism of the nail gun and is used to drive the firing pin assembly to fire nails. In this embodiment, the nail gun is a lithium-electric spring steel nail gun.

[0040] Figure 1 It is a perspective view of a partial structure of the nail gun in this embodiment. Figure 2 It is a cross-sectional view of a partial structure of the nail gun in this embodiment.

[0041] As Figure 1 and Figure 2 shown, the nail gun 100 includes an energy storage mechanism 10, a nozzle 20, and a firing pin mechanism 30. The nozzle 20 is used to receive nails from a nail storage mechanism (not shown in the figure) installed below the nozzle 20 and shoot out the nails. The firing pin mechanism 30 is used to strike the nails to fire them so that they are shot out from the nozzle 20. The energy storage mechanism 10 is used to provide kinetic energy for shooting out the nails and drive the firing pin mechanism 30 to move.

[0042] The firing pin mechanism 30 includes a firing pin rod 31 (firing pin component).

[0043] Figure 3 It is a perspective view of the firing pin component in this embodiment.

[0044] As Figure 3 shown, the tail 311 of the firing pin rod 31 (firing pin component) is generally in the shape of a rectangular plate and has a circular fixing hole 311a.

[0045] The energy storage mechanism 10 includes a housing 11, a cylinder 12, and a piston assembly 13. Among them, the cylinder 12 is fixed in the inner cavity of the housing 11 through corresponding fixing components. The cylinder 12 has a cylindrical inner cavity 121, that is, its inner side wall is a cylindrical surface, and the piston assembly 13 is movably and airtightly fitted in the inner cavity 121, dividing the inner cavity 121 into two parts. The nail gun 100 has a corresponding air intake mechanism, etc. Under its drive, the piston assembly 13 reciprocates in the inner cavity 121.

[0046] Figure 4 It is a perspective view of the piston assembly in this embodiment. Figure 5 It is an exploded view of the structure of the piston assembly in this embodiment. Figure 6 It is a cross-sectional view of the piston assembly in this embodiment.

[0047] As Figures 4 to 6 shown, the piston assembly 13 includes a piston body 131 and a plurality of piston rings. The piston rings include an elastic sealing ring 132, a first guide ring 133, and a second guide ring 134.

[0048] Figure 7 It is a side view of the piston body in this embodiment. Figure 8This is a cross-sectional view of the piston body in this embodiment.

[0049] As Figure 7 and Figure 8 shown, the piston body 131 includes an integrally formed cylinder mating portion 1311 and a striker member fixing portion 1312.

[0050] The cylinder mating portion 1311 is generally circular cap-shaped as a whole, having a circular plate-shaped support plate portion 13111, a circular support ring portion 13112, and a flange portion 13113. The surface direction of the support plate portion 13111 is perpendicular to the axial direction of the piston body 131. The support ring portion 13112 extends from the edge portion of the support plate portion 13111 substantially perpendicular to its surface direction, and the flange portion 13113 further extends radially outward along the piston body 131 from one end of the support ring portion 13112 away from the support plate portion 13111. The circumferential cross-section of the support ring portion 13112 is generally rectangular, and the circumferential cross-section of the flange portion 13113 is generally a rounded trapezoid, and the lower base (long side) of the trapezoid faces the support ring portion 13112. The maximum outer diameter of the support plate portion 13111 is smaller than the inner diameter of the inner cavity 121 of the cylinder, and the maximum outer diameter of the flange portion 13113 is also smaller than the inner diameter of the inner cavity 121 of the cylinder. A cylindrical cavity is formed between the support plate portion 13111 and the support ring portion 13112.

[0051] An annular mounting groove 13114 is formed between the edge portion of the support plate portion 13111, the outer circumference of the support ring portion 13112, and one side of the flange portion 13113 for mounting a piston ring. The bottom of the annular mounting groove 13114 has a ring of protrusions 13115 at a position close to one side wall of the groove, and the circumferential cross-section of the protrusions 13115 is rectangular. The annular mounting groove 13114 includes a first groove portion 13114a formed on one side (axial side) of the protrusions 13115 and a second groove portion 13114b formed outside (axial outside) of the protrusions 13115, and both are circular grooves.

[0052] Among them, the circumferential cross-section of the first groove portion 13114a is rectangular, its groove width is much larger than the groove width of the second groove portion 13114b, the bottom of the first groove portion 13114a is circular, the heights of both side walls are basically the same (i.e., the protrusion height of the protrusions 13115 in the radial direction), and both side walls are perpendicular to the bottom of the groove respectively.

[0053] The second groove portion 13114b is a semi-open groove body, its bottom (i.e., the surface of the protrusions 13115 perpendicular to the radial direction) is a circular ring, one side wall is perpendicular to the bottom of the groove, and the other side is open.

[0054] That is to say, compared with the piston 1 in the above-mentioned prior art, the piston body 131 in this embodiment cancels the partitioning of the mounting groove.

[0055] The striker component fixing part 1312 extends axially outward from the middle of the upper surface of the support plate part 13111 of the cylinder mating part 1311 along the axial direction of the piston body 131. The striker component fixing part 1312 includes two semi-cylindrical protrusions 13123. The side surface of the semi-cylindrical protrusion 13123 includes a cylindrical surface and a flat surface. The flat surfaces of the two semi-cylindrical protrusions 13123 face each other and are parallel to each other. A striker component installation groove 13124 that matches the tail part 311 of the striker rod is formed between the flat surfaces of the two semi-cylindrical protrusions 13123. The groove width of this groove is slightly smaller than the thickness of the tail part 311 of the striker rod. Each semi-cylindrical protrusion 13123 has a circular pin hole 13123a communicating with the striker component installation groove 13124. The connecting line direction of a pair of pin holes 13123a is perpendicular to the axial direction of the piston body 131.

[0056] Figure 9 Yes Figure 6 An enlarged view of the inner part of the middle frame A.

[0057] As Figure 5 And Figure 9 As shown, the elastic sealing ring 132 is a closed star-shaped ring, and its cross-section is roughly an X shape with rounded corners. Its axial width is smaller than the groove width of the first groove part 13114a, and its radial width is greater than the groove depth of the first groove part 13114a. In this embodiment, the groove depth of the first groove part 13114a is less than half of its radial width.

[0058] The first guide ring 133 is a closed ring, and its circumferential cross-section is a rectangular shape with a missing corner. The length of this rectangle is greater than the groove depth of the second groove part 13114b, and the width of the rectangle is roughly equal to the groove width of the second groove part 13114b. That is, both sides of the first guide ring 133 in the axial direction have a toroidal surface, and the area of one of the toroidal surfaces is relatively larger. The outer peripheral surface and the inner peripheral surface of the first guide ring 133 are both toroidal surfaces, and the width of the outer peripheral surface is smaller.

[0059] The second guide ring 134 is an open ring with an opening 1341. Its circumferential cross-section is also a rectangular shape with a missing corner. The width of this rectangle is smaller than the groove width of the first groove part 13114a, and the length of the rectangle is greater than the groove depth of the first groove part 13114a. And the size of the circumferential cross-section of the second guide ring 134 is larger than the size of the circumferential cross-section of the first guide ring 133. Both sides of the second guide ring 134 in the axial direction have a toroidal surface, and the area of one of the toroidal surfaces is relatively larger. The outer peripheral surface and the inner peripheral surface of the second guide ring 134 are both toroidal surfaces, and the width of the outer peripheral surface is smaller.

[0060] In this embodiment, the elastic sealing ring 132 is a rubber ring with relatively large elasticity. The first guide ring 133 and the second guide ring 134 are Teflon material rings with extremely low friction coefficients, which can reduce the overall resistance of the piston assembly.

[0061] The above three piston rings are all sleeved on the piston body 131 and embedded in the annular installation groove 13114, and the inner side surface of the piston ring fits with the groove bottom. Among them, the elastic sealing ring 132 is embedded in the first groove portion 13114a and is close to the side of the second groove portion 13114b. The first guide ring 133 is embedded in the second groove portion 13114b, and its larger circular ring surface faces the elastic sealing ring 132 (that is, from the cross-section view, the side without the missing corner of the rectangle faces the elastic sealing ring 132). The second guide ring 134 is embedded in the first groove portion 13114a and is close to the flange portion 13113, and its larger circular ring surface faces the elastic sealing ring 132.

[0062] When not assembled into the inner cavity 121 of the cylinder 12, the outer diameter of the elastic sealing ring 132 sleeved in the annular installation groove 13114 is slightly larger than the inner diameter of the inner cavity 121 of the cylinder, and is also larger than the outer diameters of the first guide ring 133 and the second guide ring 134. In addition, there are small gaps between the elastic sealing ring 132 and the first guide ring 133, and between the elastic sealing ring 132 and the second guide ring 134.

[0063] When assembled into the inner cavity 121 of the cylinder 12, the elastic sealing ring 132 is subjected to the extrusion of the inner side wall of the inner cavity 121. Its radial width (line width) becomes smaller, the outer diameter also becomes smaller, and the axial width becomes larger. The first guide ring 133 and the second guide ring 134 on both sides are respectively pressed against the two side walls of the annular installation groove 13114, that is, the multiple piston rings are in contact with each other, and the two outermost piston rings are also respectively in contact with the two side walls of the annular installation groove 13114, so that the piston body 131 and the multiple piston rings form a stable overall structure. At this time, the elastic sealing ring 132 is in interference fit with the inner side wall of the inner cavity 121 of the cylinder to achieve airtight sealing; the very small outer peripheral surfaces of the first guide ring 133 and the second guide ring 134 are in contact with the inner side wall of the inner cavity 121 of the cylinder, and both guide rings are made of Teflon material, so while playing a guiding role, very small friction can also be achieved.

[0064] Moreover, since the second guide ring 134 has an opening 1341, when assembling the piston assembly 13, the second guide ring 134 can be more conveniently installed into the annular installation groove 13114 by using the opening 1341.

[0065] Figure 10 It is a cross-sectional view of the piston assembly and the striker component in this embodiment, showing their assembly structure.

[0066] As Figure 10As shown in the figure, the tail 311 of the firing pin rod is inserted into the installation groove 13124 of the firing pin component. The tail 311 of the firing pin rod is clamped by two semi-cylindrical protrusions 13123. Then, the corresponding fixing pin 32 is installed so that it passes through a pair of pin holes 13123a and the fixing hole 311a on the tail 311 of the firing pin rod, and the firing pin rod 31 can be fixedly connected to the piston body 131.

[0067] Function and effect of Embodiment 1

[0068] According to the piston assembly for a nail gun, energy storage mechanism and nail gun provided in this embodiment, the piston assembly includes a piston body and a plurality of piston rings. The plurality of piston rings include an elastic sealing ring and one or more guiding rings. Since the outer diameter of the elastic sealing ring is greater than the inner diameter of the cylinder when not assembled into the cylinder, when assembled into the cylinder, the inner wall of the cylinder squeezes the elastic sealing ring, causing the radial width of the elastic sealing ring to become smaller, the overall outer diameter to become smaller, and the axial width to become larger. Thus, the elastic deformation of the elastic sealing ring can be used to press the plurality of piston rings installed in the annular installation groove to form a stable overall structure. In this way, the piston body only needs to be provided with one annular installation groove. Since the piston body only has one annular installation groove and all piston rings are installed in this annular installation groove, compared with a piston having a plurality of separated installation grooves, the axial length of this piston assembly is smaller, the utilization rate of the inner cavity of the cylinder is higher, and the manufacturing and processing of the piston body are more convenient and the cost is lower.

[0069] In the embodiment, the elastic sealing ring is a star-shaped rubber ring, and when being squeezed, it can stably press the guiding rings on both sides through its shape, making the overall stability of the piston assembly better.

[0070] Furthermore, both guiding rings are made of Teflon material with a very small coefficient of friction, and the outer peripheral surface area in contact with the inner wall of the cylinder is very small. Therefore, the frictional resistance suffered by the piston assembly during movement can be made smaller, and the movement of the piston assembly is smoother.

[0071] Furthermore, a step is formed in the annular installation groove. The cross-sectional dimension of the first guiding ring is smaller and it is installed in the second groove part on the step. The second guiding ring and the elastic sealing ring are installed in the first groove part on one side of the step. And the second guiding ring is provided with an opening. The first guiding ring with a small cross-sectional dimension is easier to expand and can be inserted from the rear end of the piston body. While the second guiding ring can be installed using the opening. Therefore, the assembly of the piston assembly is very convenient, and rapid disassembly and assembly can be achieved when the piston rings need to be replaced.

[0072] Furthermore, the maximum diameters of the support plate portion and the flange portion of the piston body are significantly smaller than the inner diameter of the cylinder. That is, the diameters at both axial ends of the piston body are set very small, and the two guide rings are correspondingly configured to have a shape with a truncated rectangular cross-section. In this way, on the premise of ensuring that multiple piston rings can be tightly pressed, even after long-term use, even if the guide rings are significantly worn, the piston body will not come into contact with the inner wall of the cylinder, and will not scratch the inner wall of the cylinder, thus ensuring the long-term reliability of the energy storage mechanism.

[0073] Furthermore, since the piston body has a striker component installation groove and a pin hole that match the tail of the striker component, the tail of the striker component can be inserted into this groove and then a fixing pin can be inserted to fixedly connect the striker component and the piston assembly. The assembly is very convenient, and the fixing pin can effectively ensure that there is no relative axial movement between the striker component and the piston assembly, making the nail gun more reliable.

[0074] <Example Two>

[0075] This embodiment provides a piston assembly, an energy storage mechanism, and a nail gun for a nail gun. In this embodiment, the same reference numerals are given to the same components as in Example One, and the corresponding descriptions are omitted.

[0076] Compared with Example One, in the nail gun 100 of this embodiment, the structure of the striker rod 31 is different, and correspondingly, the structure of the piston assembly 13 is different.

[0077] Figure 11 It is a perspective view of the striker component in this embodiment.

[0078] As Figure 11 shown, the tail 311 of the striker rod 31 (striker component) in this embodiment includes a cylindrical portion 3111 and a tapered protruding portion 3112. The diameter of the tapered protruding portion 3112 is larger than the diameter of the cylindrical portion 3111, and its large end is connected to the cylindrical portion 3111, forming a step between the two.

[0079] Figure 12 It is a perspective view of the piston assembly in this embodiment, Figure 13 It is a cross-sectional view of the piston assembly in this embodiment.

[0080] As Figure 12 and Figure 13 shown, in the piston assembly 13, the annular installation groove 13114 of the piston body 131, the elastic sealing ring 132, the first guide ring 133, and the second guide ring 134 have the same structures as in Example One. The difference lies in the structure for installing the striker rod 13 on the piston body 131.

[0081] The piston body 131 of this embodiment also includes a cylinder mating portion 1311 and a striker component fixing portion 1312 formed integrally. Among them, the striker component fixing portion 1312 is generally in the shape of a cylindrical tube with one end closed. A striker component fixing groove 1312a is formed in the middle thereof. It is a cylindrical groove, the bottom of the groove is conical, the inner diameter at the groove opening is slightly larger than the inner diameter in the middle of the groove, and a stepped shape is formed at the groove opening.

[0082] The cylinder mating portion 1311 extends outward from the outer periphery of the middle part of the striker component fixing portion 1312. The overall shape is similar to a circular cover shape. It also has a circular plate-shaped support plate portion 13111, a circular support ring portion 13112, and a flange portion 13113. The above-mentioned annular mounting groove 13114 is formed on the outer periphery.

[0083] The striker component fixing portion 1312 has a front end portion 13121 and a rear end portion 13122 that respectively protrude from two surfaces of the support plate portion 13111. Among them, the outer shape of the front end portion 13121 is in the shape of a frustum of a cone, and its small end is the outer end portion. The outer shape of the rear end portion 13122 is in the shape of a cylinder with rounded edges at the edge. Its protruding length is greater than the width of the support ring portion 13112. A circular cavity is formed between the support ring portion 13112 and the rear end portion 13122.

[0084] The length of the cylindrical portion 3111 of the striker rod tail 311 is slightly less than the groove depth of the striker component fixing groove 1312a. The diameter of the cylindrical portion 3111 is slightly larger than the inner diameter of the striker component fixing groove 1312a. The maximum diameter of the conical protruding portion 3112 is basically the same as the diameter of the front end of the striker component fixing portion 1312.

[0085] Figure 14 It is a cross-sectional view of the piston assembly and the striker component in this embodiment.

[0086] As Figure 14 shown, insert the cylindrical portion 3111 into the striker component fixing groove 1312a until the conical protruding portion 3112 abuts against the front end of the striker component fixing portion 1312, and the assembly can be completed. At this time, the cylindrical portion 3111 and the striker component fixing groove 1312a form an interference fit, so as to fixedly connect the striker rod 31 and the piston body 131, enabling the piston assembly 13 to drive the striker rod 31 to move along its axial direction.

[0087] In this embodiment, other structures are the same as those in the first embodiment, so they will not be repeated here.

[0088] Functions and effects of the second embodiment

[0089] According to the piston assembly, energy storage mechanism and nail gun provided in this embodiment, on the basis of the functions and effects of Embodiment 1, since the middle part of the piston body has a relatively long striker component fixing groove that matches the tail end structure of the striker component, the tail of the striker component can be inserted into this groove to fixedly connect the striker component and the piston assembly, and the assembly is very convenient. Through the interference fit between the two, the reliability is also very high. Moreover, such an assembly structure is also beneficial to keeping the striker component and the piston body coaxial, reducing the possibility and amount of axial inclination of the striker component relative to the cylinder and the piston body, and thus is also beneficial to reducing the wear of the piston ring in the piston assembly.

[0090] The above embodiments are only used to illustrate the specific implementation manners of the present invention, and the present invention is not limited to the description scope of the above embodiments. Those skilled in the art should understand that the present invention is not restricted by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A piston assembly for a nail gun, which is arranged in the cylinder of the nail gun and is used to drive the striker component to move to fire nails, and is characterized in that Comprising: A piston body, axially connected to the striker component at one end, having an annular mounting groove; And A plurality of piston rings, respectively sleeved in the annular mounting groove and arranged in sequence along the axial direction of the piston body, and all in contact with the inner wall of the cylinder, Wherein, the plurality of piston rings include an elastic sealing ring and one or more guiding rings, When not assembled into the cylinder, the outer diameter of the elastic sealing ring is greater than the inner diameter of the cylinder, When assembled in the cylinder, all the piston rings are in contact with each other, and the outermost piston ring is in contact with the wall of the annular mounting groove.

2. The piston assembly for a nail gun according to claim 1, wherein: Among them, The elastic sealing ring is a rubber ring with a star-shaped cross-section, The guiding ring is a Teflon ring with a truncated rectangular cross-section, and the size of its outer peripheral surface is smaller than that of its inner peripheral surface.

3. The piston assembly for a nail gun according to claim 2, wherein: Among them, There are two guiding rings, respectively arranged on both sides of the elastic sealing ring, The guiding ring has two axially side surfaces in a circular ring shape, and one of the axially side surfaces with a larger area faces the elastic sealing ring, When not assembled into the cylinder, the outer diameter of the elastic sealing ring is greater than the outer diameter of the guiding ring.

4. The piston assembly for a nail gun according to claim 3, wherein: Among them, The two guiding rings are respectively a first guiding ring and a second guiding ring, The circumferential cross-sectional dimension of the first guiding ring is smaller than that of the second guiding ring, One side of the bottom of the annular mounting groove has a protrusion, a first groove portion is formed on one side of the protrusion, and a second groove portion is formed above the protrusion, The first guiding ring is arranged in the second groove portion, and the radial width of the first guiding ring is greater than the groove depth of the second groove portion, The elastic sealing ring and the second guiding ring are arranged in the first groove portion, and the elastic sealing ring is close to the protrusion. The radial widths of the elastic sealing ring and the second guiding ring are both greater than the groove depth of the first groove portion.

5. The piston assembly for a nail gun according to claim 4, wherein: Among them, The annular mounting groove is arranged in the middle of the piston body in the axial direction, The diameters of both ends of the piston body in the axial direction are smaller than the inner diameter of the cylinder.

6. The piston assembly for a nail gun according to claim 4, wherein: Among them, The elastic sealing ring and the first guiding ring are closed rings, The second guiding ring has an opening.

7. The piston assembly for a nail gun according to claim 1, wherein: Among them, The tail end of the striker component has a cylindrical portion and a conical protruding portion, The middle part of the piston body has a striker component fixing groove matching with the cylindrical portion for being fitted with the cylindrical portion, so as to fixedly connect the piston body and the striker component.

8. The piston assembly for a nail gun according to claim 1, wherein: Among them, The tail end of the striker component is in a plate shape and has a fixing hole, One axial end of the piston body has a striker component mounting groove matching with the tail end and a pair of pin holes communicating with the striker component mounting groove. The striker component mounting groove is used for fitting with the tail end, and the pin holes are used for arranging fixing pins passing through the fixing holes, so as to fixedly connect the piston body with the striker component.

9. A energy storage mechanism is provided in a nail gun having a firing pin component, characterized in that, Comprising: A cylinder; And A piston assembly, movably and airtightly fitted in the inner cavity of the cylinder, for driving the striker component to move. Wherein, the piston assembly for the nail gun is the piston assembly for the nail gun according to any one of claims 1-8.

10. A nail gun, characterized in that, Comprising: A striker component; And An energy storage mechanism, for storing energy and driving the striker component to move, so that the striker component strikes a nail. Wherein, the energy storage mechanism is the energy storage mechanism according to claim 9.

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