Electric tool

Abstract

The utility model discloses an electric tool which comprises an air cylinder, a piston, a punch hammer, an impact rod, an oil storage tank, a first transmission mechanism and a second transmission mechanism. A first containing cavity is formed in the air cylinder in the axial direction, the piston is installed in the first containing cavity in a sliding mode, a second containing cavity is formed in the piston in the axial direction, and the two ends of the second containing cavity are the open end and the closed end respectively. The punch hammer is slidably installed in the second containing cavity, a gap is formed between the punch hammer and the closed end of the second containing cavity, the impact rod is slidably installed in the first containing cavity and located on the side, away from the closed end of the second containing cavity, of the punch hammer, and the oil storage groove is formed in the circumferential outer surface of the piston and / or the punch hammer. The first transmission mechanism is used for driving the piston to reciprocate in the first containing cavity. The second transmission mechanism is used for driving the cylinder to rotate. The oil storage grooves are formed in the circumferential outer surfaces of the piston and the punch hammer, friction between the piston and the inner wall of the air cylinder and friction between the punch hammer and the inner wall of the piston are reduced, and the service life of the electric tool is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of tools, and in particular relates to an electric tool. Background Art

[0002] Electric hammer and electric pick are electric tools for drilling holes, slotting and chiseling on concrete. The output end of electric hammer and electric pick can generally output two kinds of motion, one of which is reciprocating linear motion and the other is rotational motion. The reciprocating linear motion is achieved by the piston making high-speed reciprocating linear motion in the cylinder to impact the hammer, and the hammer then impacts the impact rod, while the rotational motion is achieved by the rotation of the cylinder.

[0003] The internal parts of the electric hammer and electric pick are all in a state of high-speed motion, especially the piston and the hammer. During the high-speed reciprocating linear motion, they and their sealing rings often produce friction with the surrounding parts, resulting in a large degree of wear on the piston, the hammer and the sealing rings of the two sets, and frequent damage, which seriously affects the stability and service life of the electric hammer and the electric pick.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The utility model aims to provide an electric tool, which reduces the friction between the piston and the inner wall of the cylinder, the hammer and the inner wall of the piston, and prolongs the service life of the electric tool by arranging oil storage grooves on the circumferential outer surfaces of the piston and the hammer.

[0006] In order to achieve the above-mentioned purpose, a specific embodiment of the utility model provides an electric tool, including a cylinder, a piston, a hammer, an impact rod, an oil storage tank, a first transmission mechanism and a second transmission mechanism. The cylinder is axially provided with a first receiving chamber with two open ends, the piston is at least partially slidably installed in the first receiving chamber, and the piston is axially provided with a second receiving chamber, and the two ends of the second receiving chamber are an open end and a closed end respectively. The hammer is at least partially slidably installed in the second receiving chamber, and there is a gap between the hammer and the closed end of the second receiving chamber, the impact rod is slidably installed in the first receiving chamber, and is located on the side of the hammer away from the closed end of the second receiving chamber, the oil storage tank is provided on the circumferential outer surface of the piston and / or the hammer, and the oil storage tank is formed by honing. The first transmission mechanism is connected to the piston, and is used to drive the piston to reciprocate in the first receiving chamber. The second transmission mechanism is connected to the cylinder, and is used to drive the cylinder to rotate.

[0007] In one or more embodiments of the present invention, the oil storage tank includes a first oil storage tank and a second oil storage tank having different spiral directions and intersecting with each other.

[0008] In one or more embodiments of the present invention, the oil storage tank includes a plurality of first oil storage tanks arranged in parallel and a plurality of second oil storage tanks arranged in parallel, and each of the first oil storage tanks intersects with all of the second oil storage tanks.

[0009] In one or more embodiments of the present invention, the axial spacing of the first oil storage grooves is 1 to 6 mm.

[0010] In one or more embodiments of the present invention, the axial spacing of the second oil storage grooves is 1 to 6 mm.

[0011] In one or more embodiments of the present invention, the angle between the first oil storage tank and the second oil storage tank is 20-60°.

[0012] In one or more embodiments of the present invention, a plurality of oil storage grooves are provided on the circumferential outer surfaces of the piston and the hammer.

[0013] In one or more embodiments of the present invention, a plurality of oil storage grooves on the circumferential outer surface of the piston are arranged along the circumference of the piston.

[0014] In one or more embodiments of the present invention, a plurality of oil storage grooves on the circumferential outer surface of the hammer are arranged along the circumference of the hammer.

[0015] In one or more embodiments of the present invention, a plurality of oil storage grooves on the circumferential outer surface of the piston are arranged along the axial direction of the piston.

[0016] In one or more embodiments of the present invention, a plurality of oil storage grooves on the circumferential outer surface of the hammer are arranged along the axial direction of the hammer.

[0017] In one or more embodiments of the utility model, the first transmission mechanism includes a transmission shaft, a first clutch and a swing bearing. The first clutch is sleeved on the transmission shaft and rotates synchronously with the transmission shaft. One end of the swing bearing is sleeved on the transmission shaft, and the other end is rotationally connected to an end of the piston away from the impact rod. The first clutch can be detachably engaged with the swing bearing to drive the swing bearing to convert the rotational motion of the transmission shaft into linear reciprocating motion of the piston.

[0018] In one or more embodiments of the utility model, the second transmission mechanism includes a second clutch mounted on the transmission shaft, a first gear and a second gear mounted on the cylinder, a third clutch, an elastic member and a stop member, the second clutch is detachably meshed with the first gear and rotates synchronously with the transmission shaft, the first gear is meshed with the second gear and can rotate relative to the transmission shaft, the second gear can rotate relative to the cylinder, the third clutch rotates synchronously with the cylinder, one end of the elastic member abuts against the stop member, and the other end abuts against the third clutch, thereby driving the third clutch to detachably engage with the second gear.

[0019] Compared with the prior art, the electric tool of the utility model is provided with an oil storage groove on the circumferential outer surface of the piston and the hammer, so that a certain amount of lubricating oil can be stored on the circumferential outer surface of the piston and the hammer, thereby increasing the smoothness of the circumferential outer surface of the piston and the hammer, reducing the friction between the piston and the inner wall of the cylinder, and between the hammer and the inner wall of the piston, reducing the wear of the piston and the hammer, and extending the service life of the electric tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings described below are only some implementations recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a cross-sectional structural diagram of an electric tool in one embodiment of the utility model;

[0022] Figure 2 It is a partial cross-sectional structural diagram of an electric tool in one embodiment of the utility model;

[0023] Figure 3 This is an exploded structural diagram of a cylinder, a piston and a hammer in one embodiment of the utility model;

[0024] Figure 4 The exploded structure diagram of the piston and the hammer in one embodiment of the utility model.

[0025] Explanation of main figure marks: 1. cylinder, 2. piston, 3. hammer, 4. impact rod, 5. oil storage tank, 51. first oil storage tank, 52. second oil storage tank, 6. transmission shaft, 7. first clutch, 8. swing bearing, 9. second clutch, 10. first gear, 11. second gear, 12. third clutch, 13. elastic member, 14. stop member. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the implementation of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation of the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementations. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] Reference Figures 1 to 4As shown, the electric tool in one embodiment of the utility model includes a cylinder 1, a piston 2, a hammer 3, an impact rod 4, an oil storage tank 5, a first transmission mechanism and a second transmission mechanism. The cylinder 1 is axially provided with a first receiving chamber with two ends being open. The piston 2 is at least partially slidably installed in the first receiving chamber, and the piston 2 is axially provided with a second receiving chamber, one end of the second receiving chamber is an open end, and the other end is a closed end. The hammer 3 is at least partially slidably installed in the second receiving chamber, and there is a gap between the hammer 3 and the closed end of the second receiving chamber. The impact rod 4 is slidably installed in the first receiving chamber, and is located on the side of the hammer 3 away from the closed end of the second receiving chamber. The oil storage tank 5 is provided on the circumferential outer surface of the piston 2 and the hammer 3, and the oil storage tank 5 is formed by honing. The first transmission mechanism is connected to the piston 2, and is used to drive the piston 2 to reciprocate along the first receiving chamber. The second transmission mechanism is connected to the cylinder 1, and is used to drive the cylinder 1 to rotate.

[0028] It should be noted that the electric tool in the above embodiment can be an electric hammer, an electric pick or other electric tools with linear reciprocating output and rotation output. In addition, the end of the impact rod 4 away from the hammer 3 is also equipped with a coaxially arranged working accessory, such as a drill bit, which reciprocates along the axial direction of the cylinder 1 and rotates synchronously with the cylinder 1.

[0029] According to the above structural design, when the first transmission mechanism drives the piston 2 to move in the direction close to the impact rod 4, the space between the closed end of the second receiving chamber in the piston 2 and the hammer 3 tends to be compressed, causing the air pressure in the space to increase. After the air pressure increases, the hammer 3 is driven to move in the direction close to the impact rod 4, thereby causing the hammer 3 to hit the impact rod 4, and then hit the working accessory through the impact rod 4, driving the working accessory to move in the direction away from the impact rod 4. Conversely, when the first transmission mechanism drives the piston 2 to move in the direction away from the impact rod 4, the hammer 3 moves toward the closed end close to the second receiving chamber.

[0030] In the transmission process of the above structure, since the circumferential outer surface of the piston 2 and the hammer 3 is provided with the oil storage tank 5, a certain amount of lubricating oil can be stored on the circumferential outer surface of the piston 2 and the hammer 3, which can increase the smoothness of the circumferential outer surface of the piston 2 and the hammer 3, reduce the friction between the piston 2 and the inner wall of the cylinder 1, and between the hammer 3 and the inner wall of the piston 2, reduce the wear of the piston 2 and the hammer 3, reduce the consumption of grease caused by frictional heat, and extend the service life of the electric tool. At the same time, the oil storage tank 5 can also allow the lubricating oil to be recycled in the first receiving chamber and the second receiving chamber.

[0031] In addition, when sealing rings are sleeved on the piston 2 and the hammer 3, the above structure can also reduce the friction between the sealing ring and the inner wall of the cylinder 1 and the inner wall of the piston 2, and extend the service life of the sealing ring.

[0032] Those skilled in the art will appreciate that, in other embodiments, the oil storage tank 5 may also be provided only on the piston 2 or the hammer 3 , which can also reduce the friction between the piston 2 and the inner wall of the cylinder 1 or between the hammer 3 and the inner wall of the piston 2 .

[0033] In one embodiment, in order to increase the oil storage capacity of the oil storage tank 5 and its impact range, refer to Figure 4 As shown, the oil storage tank 5 is constructed as a cross-shaped structure. Specifically, the oil storage tank 5 includes a first oil storage tank 51 and a second oil storage tank 52 with different spiral directions, and the first oil storage tank 51 and the second oil storage tank 52 are crossed.

[0034] Reference Figure 4 As shown, the oil storage tank 5 includes a plurality of first oil storage tanks 51 arranged in parallel and a plurality of second oil storage tanks 52 arranged in parallel, and each first oil storage tank 51 intersects with all the second oil storage tanks 52 to form a reticular oil storage tank 5 .

[0035] Furthermore, in order to make the oil storage tank 5 have better oil storage performance, the spacing between the first oil storage tank 51 and the second oil storage tank 52 can be reasonably set. Specifically, the axial spacing of the first oil storage tank 51 can be set to 1-6 mm. Preferably, the above spacing can be 1 mm, 2 mm, 4 mm or 6 mm.

[0036] Similarly, the axial spacing of the second oil storage grooves 52 can be set to 1-6 mm. Preferably, the above spacing can be 1 mm, 3 mm or 6 mm.

[0037] In addition, in order to further improve the oil storage performance of the oil storage tank 5, the angle between the first oil storage tank 51 and the second oil storage tank 52 can be reasonably set. Specifically, the angle between the first oil storage tank 51 and the second oil storage tank 52 can be set to 20-60°. Preferably, the above angle can be 20°, 30°, 40°, 50° or 60°.

[0038] On the premise that the structure of the oil storage tank 5 has been reasonably set, in order to further improve the oil storage performance of the oil storage tank 5, the oil storage performance of the oil storage tank 5 can be improved by stacking the number of oil storage tanks 5. Figure 4 As shown, the circumferential outer surfaces of the piston 2 and the hammer 3 are provided with a plurality of oil storage grooves 5. The oil storage grooves 5 are distributed at various parts of the piston 2 and the hammer 3 as much as possible, so that the lubricating oil in the oil storage grooves 5 can flow to various parts of the piston 2 and the hammer 3.

[0039] Further, see Figure 4 As shown, the multiple oil storage grooves 5 on the circumferential outer surfaces of the piston 2 and the hammer 3 can be arranged along the circumference thereof, so that the oil storage grooves 5 are distributed at various positions of the piston 2 and the hammer 3 in the circumferential direction.

[0040] Similarly, the multiple oil storage grooves 5 on the circumferential outer surfaces of the piston 2 and the hammer 3 can also be arranged along the axial direction thereof, so that the oil storage grooves 5 are distributed at various positions of the piston 2 and the hammer 3 in the axial direction.

[0041] In one embodiment, reference Figure 2 As shown, the first transmission mechanism includes a transmission shaft 6, a first clutch 7 and a swing bearing 8. The first clutch 7 is sleeved on the transmission shaft 6 and rotates synchronously with the transmission shaft 6. One end of the swing bearing 8 is sleeved on the transmission shaft 6, and the other end is rotationally connected to the end of the piston 2 away from the impact rod 4. The first clutch 7 can be detachably engaged with the swing bearing 8 to drive the swing bearing 8 to convert the rotational motion of the transmission shaft 6 into a linear reciprocating movement of the piston 2.

[0042] The first clutch 7 cooperates with a switch button or a gear button of the electric tool so that the operator can control the on and off of the transmission path of the first transmission mechanism through the switch button or the gear button.

[0043] The meshing connection between the first clutch 7 and the swing bearing 8 can be achieved through a spline and a groove matched with the spline.

[0044] Further, see Figure 2 As shown, the second transmission mechanism includes a first gear 10 sleeved on the transmission shaft 6, a second clutch 9, a second gear 11 sleeved on the cylinder 1, a third clutch 12, an elastic member 13 and a stopper 14, the second clutch 9 is detachably meshed with the first gear 10 and rotates synchronously with the transmission shaft 6, the first gear 10 is meshed with the second gear 11 and can rotate relative to the transmission shaft 6, the second gear 11 can rotate relative to the cylinder 1, and the third clutch 12 rotates synchronously with the cylinder 1. The elastic member 13 includes but is not limited to a spring, and the stopper 14 includes but is not limited to a retaining spring. One end of the elastic member 13 abuts against the stopper 14, and the other end abuts against the third clutch 12, which is used to drive the third clutch 12 to detachably mesh with the second gear 11.

[0045] The second clutch 9 cooperates with a switch button or a gear button of the electric tool so that the operator can control the on and off of the transmission path of the second transmission mechanism through the switch button or the gear button.

[0046] The meshing connection between the second clutch 9 and the first gear 10 and the meshing connection between the third clutch 12 and the second gear 11 can be achieved through splines and grooves matched with the splines.

[0047] The third clutch 12 can be separated from the second gear 11 when the working accessory (such as a drill bit) is blocked. Specifically, a spline can be set on the third clutch 12, a groove matching the spline can be set on the second gear 11, and an inclined guide surface can be set on the spline along its rotation direction, so that when the working accessory is blocked (that is, the cylinder 1 and the third clutch 12 cannot rotate), the spline on the third clutch 12 can move out of the groove on the second gear 11 during the rotation of the second gear 11, thereby preventing the third clutch 12 from affecting the normal rotation of the second gear 11 and avoiding damage to the second transmission mechanism caused by the blocking of the working accessory.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric tool, characterized in that: include: The cylinder (1) is provided with a first receiving cavity with openings at both ends in the axial direction; A piston (2) is at least partially slidably mounted in the first receiving cavity, and a second receiving cavity is axially provided on the piston (2), wherein two ends of the second receiving cavity are respectively an open end and a closed end; A hammer (3) is at least partially slidably mounted in the second receiving cavity and has a gap between the hammer and the closed end of the second receiving cavity; An impact rod (4) is slidably mounted in the first receiving cavity and is located on a side of the impact hammer (3) away from the closed end of the second receiving cavity; An oil storage groove (5) is provided on the circumferential outer surface of the piston (2) and / or the hammer (3), and the oil storage groove (5) is formed by honing; a first transmission mechanism, connected to the piston (2) and used to drive the piston (2) to move back and forth in the first receiving chamber; as well as The second transmission mechanism is connected to the cylinder (1) and is used to drive the cylinder (1) to rotate.

2. The electric tool according to claim 1, characterized in that: The oil storage tank (5) comprises a first oil storage tank (51) and a second oil storage tank (52) having different spiral directions and intersecting with each other.

3. The electric tool according to claim 2, characterized in that: The oil storage tank (5) comprises a plurality of first oil storage tanks (51) arranged in parallel and a plurality of second oil storage tanks (52) arranged in parallel, and each of the first oil storage tanks (51) intersects with all of the second oil storage tanks (52).

4. The electric tool according to claim 3, characterized in that: The axial spacing of the first oil storage grooves (51) is 1 to 6 mm; and / or, The axial spacing of the second oil storage grooves (52) is 1 to 6 mm.

5. The electric tool according to claim 2, characterized in that: The included angle between the first oil storage tank (51) and the second oil storage tank (52) is 20 to 60 degrees.

6. The electric tool according to claim 1, characterized in that: The circumferential outer surfaces of the piston (2) and the hammer (3) are both provided with a plurality of oil storage grooves (5).

7. The electric tool according to claim 6, characterized in that: The plurality of oil storage grooves (5) on the circumferential outer surface of the piston (2) are arranged along the circumference of the piston (2); and / or, The plurality of oil storage grooves (5) on the circumferential outer surface of the hammer (3) are arranged along the circumference of the hammer (3).

8. The electric tool according to claim 6, characterized in that: The plurality of oil storage grooves (5) on the circumferential outer surface of the piston (2) are arranged along the axial direction of the piston (2); and / or, The plurality of oil storage grooves (5) on the circumferential outer surface of the hammer (3) are arranged along the axial direction of the hammer (3).

9. The electric tool according to claim 1, characterized in that: The first transmission mechanism comprises a transmission shaft (6), a first clutch (7) and a swing bearing (8); the first clutch (7) is sleeved on the transmission shaft and rotates synchronously with the transmission shaft (6); one end of the swing bearing (8) is sleeved on the transmission shaft (6), and the other end is rotationally connected to an end of the piston (2) away from the impact rod (4); the first clutch (7) is detachably engaged with the swing bearing (8) to drive the swing bearing (8) to convert the rotational motion of the transmission shaft (6) into a linear reciprocating motion of the piston (2).

10. The electric tool according to claim 9, characterized in that: The second transmission mechanism comprises a second clutch (9) sleeved on the transmission shaft (6), a first gear (10), a second gear (11) sleeved on the cylinder (1), a third clutch (12), an elastic member (13) and a stopper (14); the second clutch (9) is detachably meshed with the first gear (10) and rotates synchronously with the transmission shaft (6); the first gear (10) is meshed with the second gear (11) and can rotate relative to the transmission shaft (6); the second gear (11) can rotate relative to the cylinder (1); the third clutch (12) rotates synchronously with the cylinder (1); one end of the elastic member (13) abuts against the stopper (14), and the other end abuts against the third clutch (12), thereby driving the third clutch (12) to detachably mesh with the second gear (11).

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