An electric hammer cylinder

Abstract

The present invention provides an electric hammer cylinder, belonging to the field of electric tools. It includes a cylinder body, one end of the cylinder body is provided with a cylinder hole, the other end is provided with two connecting ears, the two connecting ears are provided with coaxially arranged connecting holes, the tops of the two connecting ears are connected as a whole through a connecting plate, the roots of the two connecting ears are connected as a whole, and transition through a circular arc. The tops and roots of the two connecting ears of the present invention are connected as a whole, so that the structural strength is greatly enhanced; at the same time, the connection is an arc transition, so as to effectively avoid the lateral fracture of the roots of the connecting ears and the connecting holes; the service life of the electric hammer cylinder is far longer than the service life of other parts of the electric hammer, even if other parts of the electric hammer cylinder are damaged and replaced, the electric hammer cylinder will not be damaged and replaced.

Description

Technical Field

[0001] The invention relates to the field of electric tools, in particular to an electric hammer cylinder. Background Art

[0002] The electric hammer is a commonly used electric tool. The electric hammer cylinder is a key component of the electric hammer, which is usually made of aluminum. See the patent with announcement number CN202241182U, entitled a single-knob four-function electric hammer, in which the electric hammer includes an impact shaft, a cylinder, a motor shaft and a rocker bearing. The cylinder is arranged on the impact shaft and connected to the rocker bearing. The cylinder assembly realizes reciprocating motion in the inner hole of the rotating sleeve through the back and forth swing of the rocker in the rocker bearing.

[0003] Traditional electric hammer cylinder as attached Figure 1 As shown, it comprises a cylinder body 1, a cylinder hole 2 is arranged at one end of the cylinder body 1, two connecting ears 3 are arranged at the other end of the cylinder body 1, and coaxially arranged connecting holes 4 are arranged on the two connecting ears 3, wherein the roots of the two connecting ears 3 are right-angle transitions.

[0004] In the daily use of electric hammers, the electric hammer cylinder is a consumable part, and usually needs to be replaced several times before the overall service life of the electric hammer is reached. Figure 2 and 3 The conventional electric hammer cylinder is very prone to lateral fracture of the connecting hole 4 and root fracture of the connecting ear 3, which seriously affects the overall use of the electric hammer. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an electric hammer cylinder, the connecting ears of which are not easily broken and damaged, and the service life of the electric hammer cylinder far exceeds the service life of other parts of the electric hammer.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: an electric hammer cylinder, comprising a cylinder body, one end of the cylinder body is provided with a cylinder hole, the other end is provided with two connecting ears, the two connecting ears are provided with coaxially arranged connecting holes, and the tops of the two connecting ears are connected as a whole through a connecting plate.

[0007] Through the above technical solution, the two connecting ears are equivalent to becoming a whole, which effectively enhances the structural strength of the two connecting ears; when the rocker rod drives the rotating pin to move in the connecting hole, the stress on the two connecting ears is distributed to each connecting ear by the connecting plate, so that it is very strong and not easy to break.

[0008] Preferably, the middle portion of the lower surface of the connecting plate is flush with the top of the connecting hole, and first clearance notches that are externally inclined upward are provided on both sides of the connecting plate.

[0009] Through the above technical solution, the structure of the connecting hole of the connecting plate is also strengthened, effectively preventing the connecting hole from breaking; here, the first clearance gap leaves necessary space for the swing of the rocker arm, preventing the rocker arm from colliding or interfering with the connecting plate, thereby protecting the connecting ear and the connecting hole from another angle.

[0010] Preferably, the angle between the first clearance gap and the horizontal line is 15°~20°.

[0011] Through the above technical solution, the swing rod is effectively given way according to the swing amplitude, and the connection range between the connecting plate and the connecting ear is fully increased, so that the structures of the two are more solid.

[0012] Preferably, the bottoms of the connecting holes on the two connecting ears are connected as one.

[0013] Through the above technical solution, while the strength of the bottom of the connecting hole is enhanced, the structural strength of the base of the connecting ear is effectively enhanced, which greatly increases the service life of the cylinder.

[0014] Preferably, the two sides of the base of the two connecting ears are connected as a whole and transitioned through an arc, and the base of the two sides of the two connecting ears are provided with a second paving notch that is externally inclined downward.

[0015] Through the above technical scheme, the integrated range of the connecting ear root is increased, and at the same time the arc transition form reduces the stress concentration phenomenon at the connecting ear root, effectively enhancing the structural strength of the connecting ear root, making the root less likely to break, and greatly increasing the service life of the cylinder; here, the second clearance gap leaves the necessary space for the swing of the rocker arm.

[0016] Preferably, the angle between the second clearance gap and the horizontal line is 15°~20°.

[0017] Through the above technical solution, the swing rod is effectively given way according to the swing amplitude, and the integrated connection range of the ear base is fully increased, making the structure more solid.

[0018] Preferably, an oil storage tank is provided on the outer circumferential surface of the cylinder body.

[0019] Through the above technical solution, the oil storage tank can store grease or oil to provide lubrication for the cylinder body when the cylinder body moves.

[0020] Preferably, the length direction of the oil storage tank is arranged along the axial direction of the cylinder body, and the oil storage tank is evenly distributed circumferentially on the outer circle of the cylinder body.

[0021] Through the above technical solution, the circulation of grease or oil is more conducive to the movement direction of the cylinder body.

[0022] Preferably, the oil storage groove is a spiral groove extending axially around the cylinder body.

[0023] Through the above technical solution, the spiral groove surrounds the cylinder body, which can fully lubricate the cylinder body, and the grease or oil is consumed slowly.

[0024] The technical effects of the present invention are mainly reflected in the following aspects:

[0025] 1. The top and root of the two connecting ears are connected as one, which greatly enhances the structural strength and makes it difficult for the connecting ears to break at the root;

[0026] 2. By making way for the gap, the integral range of the top and root of the connecting ear and the connecting hole is fully increased according to the swing amplitude of the swing rod, which greatly enhances the structural strength of the connecting ear and the connecting hole, and effectively prevents the root of the connecting ear from breaking and the connecting hole from lateral rupture;

[0027] 3. The oil storage tank greatly enhances the smoothness of the cylinder movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the prior art;

[0029] Figure 2 It is a schematic diagram of the fracture form of the base of the cylinder connection ear in the prior art;

[0030] Figure 3 It is a schematic diagram of the transverse fracture form of the cylinder connection hole in the prior art;

[0031] Figure 4 It is a structural schematic diagram of embodiment 1;

[0032] Figure 5 for Figure 4 Middle AA section view;

[0033] Figure 6 It is a schematic diagram of the cross-sectional structure in the first embodiment, and is intended to show the three-dimensional structure viewed in the AA direction;

[0034] Figure 7 for Figure 4 Middle BB section view;

[0035] Figure 8 It is a structural schematic diagram of the second embodiment;

[0036] Fig. 9 This is a schematic diagram of the structure of the third embodiment.

[0037] Figure numerals: 1, cylinder body; 2, cylinder hole; 3, connecting ear; 4, connecting hole; 5, connecting plate; 6, first clearance gap; 7, second clearance gap; 8, oil storage tank. DETAILED DESCRIPTION

[0038] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0039] Embodiment 1, an electric hammer cylinder:

[0040] As attached Figures 4 to 7 The electric hammer cylinder shown in the figure comprises a cylinder body 1, a cylinder hole 2 is provided at one end of the cylinder body 1, two connecting ears 3 are provided at the other end, connecting holes 4 are coaxially arranged on the two connecting ears 3, and the tops of the two connecting ears 3 are connected as a whole through a connecting plate 5. Among them, the middle part of the lower surface of the connecting plate 5 is flush with the top of the connecting hole 4, and first clearance notches 6 are provided on both sides of the connecting plate 5 and are arranged externally and upwardly inclined. The first clearance notches 6 leave necessary space for the swing of the swing rod to prevent the swing rod from colliding with the connecting plate 5. Here, the connecting plate 5 and the cylinder body 1 are originally integrated, and the connecting plate 5 is formed during the cylinder processing process, so it is represented by the connecting plate 5. Therefore, the two connecting ears 3 are equivalent to becoming a whole, which effectively enhances the structural strength of the two connecting ears 3; when the swing rod drives the rotating pin to move in the connecting hole 4, the stress of the two connecting ears 3 is distributed to each connecting ear 3 by the connecting plate 5, so that it is very strong and not easy to break.

[0041] The bottoms of the connection holes 4 on the two connection ears 3 are connected as one, and the two sides of the roots of the two connection ears 3 are also connected as one and transitioned through an arc. The roots of the two sides of the two connection ears 3 are provided with second paving notches 7 that are tilted downward on the outside. Here, while the strength of the bottom of the connection hole 4 is enhanced, the structural strength of the roots of the connection ears 3 is effectively enhanced; in addition, the arc transition form reduces the stress concentration phenomenon at the roots of the connection ears 3, greatly increasing the service life of the cylinder.

[0042] In the above structure, the angle a between the first clearance gap 6 and the horizontal line can be 15°-20°, and the angle b between the second clearance gap 7 and the horizontal line can be 15°-20°. In this embodiment, both the angle a and the angle b are selected to be 20°.

[0043] The processing steps of the connecting ear part of the electric hammer cylinder in this embodiment are as follows:

[0044] 1. Clamp the workpiece with a specific tool. First, mill the two sides of the cylinder end with a milling process to form the sides of the two connecting ears.

[0045] 2. Then, a through hole is directly drilled at the connecting ear at the end of the cylinder by drilling technology, which is equivalent to the connecting holes at the two connecting ears;

[0046] 3. Then, the two side surfaces milled in step 1 are milled separately by a milling process. Here, a specific device is required to clamp and process the first clearance gap and the second clearance gap;

[0047] 4. Finally, the workpiece is polished and ground to remove burrs; thereby obtaining the structure of the connecting ear in this embodiment.

[0048] Embodiment 2, an electric hammer cylinder:

[0049] See attached Figure 8 The difference between the second embodiment and the first embodiment is that an oil storage tank 8 is provided on the outer circumferential surface of the cylinder body 1, the length direction of the oil storage tank 8 is provided along the axial direction of the cylinder body 1, and the oil storage tank 8 is evenly distributed circumferentially on the outer circumference of the cylinder body 1. The oil storage tank 8 can store grease or oil to provide lubrication to the cylinder body 1 when the cylinder body 1 moves.

[0050] Embodiment 3, an electric hammer cylinder:

[0051] See attached Fig. 9 The difference between the third embodiment and the second embodiment is that the oil storage groove 8 is a spiral groove extending axially around the cylinder body 1. The spiral groove surrounds the cylinder body 1, which can fully lubricate the cylinder body 1, and the grease or oil is consumed slowly.

[0052] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. An electric hammer cylinder, comprising a cylinder body (1), one end of the cylinder body (1) is provided with a cylinder hole (2), the other end is provided with two connecting ears (3), the two connecting ears (3) are provided with coaxially arranged connecting holes (4), wherein: The tops of the two connecting ears (3) are connected as a whole through a connecting plate (5), the middle of the lower surface of the connecting plate (5) is flush with the top of the connecting hole (4), both sides of the connecting plate (5) are provided with first clearance notches (6) externally arranged upwardly inclined, the bottoms of the connecting holes (4) on the two connecting ears (3) are connected as a whole, the two sides of the roots of the two connecting ears (3) are connected as a whole and transitioned through an arc, the roots of the two connecting ears (3) are provided with second clearance notches (7) externally arranged downwardly inclined, and the outer circumferential surface of the cylinder body (1) is provided with an oil storage groove (8).

2. The electric hammer cylinder according to claim 1, characterized in that: The angle between the first clearance gap (6) and the horizontal line is 15° to 20°.

3. The electric hammer cylinder according to claim 1 is characterized in that: The angle between the second clearance gap (7) and the horizontal line is 15° to 20°.

4. The electric hammer cylinder according to claim 1 is characterized in that: The length direction of the oil storage groove (8) is arranged along the axial direction of the cylinder body (1), and the oil storage groove (8) is evenly distributed circumferentially on the outer circle of the cylinder body (1).

5. The electric hammer cylinder according to claim 4 is characterized in that: The oil storage groove (8) is a spiral groove extending axially around the cylinder body (1).

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