Power tool

Abstract

The application provides an electric tool. The electric tool comprises a housing, a first stopper radially protruding from an inner wall of the housing, an impact pin arranged in the housing, a middle section of the impact pin having a radially protruding shoulder, a buffer ring sleeved on the impact pin and arranged between the first stopper of the housing and the shoulder of the impact pin, a hammer arranged in the housing and abutting against the impact pin, a hammer tube for accommodating the hammer, the hammer tube having an unloading hole communicating an inner wall and an outer wall of the hammer tube, the hammer reciprocating in the hammer tube under driving, a sliding sleeve sleeved on the outer wall of the hammer tube and reciprocating along the outer wall of the hammer tube under control, the sliding sleeve having a first state of exposing the unloading hole and a second state of closing the unloading hole, and a transmission assembly for transmitting displacement of the impact pin to the sliding sleeve. According to the technical scheme of the application, while transmitting the displacement change of the impact pin to the sliding sleeve, transmission of high-frequency vibration of the impact pin is avoided, thereby improving reliability of the electric tool.

Description

Technical Field

[0001] This application relates to the field of power tools, and more specifically, to a power tool having a reciprocating transmission mechanism. Background Technology

[0002] In existing technologies, systems with vibration mechanisms, such as electric hammers and impact hammers, typically employ a piston and cylinder configuration to provide power. To avoid providing power unintended, an unloading hole is usually provided on the hammer tube of such power tools. However, when this unloading hole is closed, the hammer tube can function as a cylinder; when the unloading hole is open, air pressure cannot be generated within the hammer tube. Currently, a sliding sleeve located outside the hammer tube is typically used to control the opening and closing of the unloading hole, and this sliding sleeve is controlled by the displacement of an impact pin. When the power tool is brought close to the workpiece, the impact pin moves towards the hammer tube within the power tool, thereby directly or via a transmission assembly actuating the sliding sleeve, ultimately linking the tool's working state with the opening and closing state of the unloading hole. During this transmission process, the displacement change of the impact pin is often accompanied by high-frequency vibration. This high-frequency vibration, along with the displacement change, is transmitted to the transmission assembly and the sliding sleeve, making these components prone to damage, affecting their lifespan and the operational reliability of the power tool. Summary of the Invention

[0003] In view of this, the present invention provides an improved power tool that effectively solves or alleviates one or more of the above-mentioned problems and other issues existing in the prior art.

[0004] To address one of the aforementioned technical problems, according to one aspect of this application, a power tool is provided, comprising: a housing having a radially protruding first stop portion on its inner wall; an impact pin disposed within the housing, wherein the intermediate section of the impact pin has a radially protruding shoulder; a buffer ring sleeved on the impact pin and disposed between the first stop portion and the shoulder of the impact pin within the housing; a hammer disposed within the housing and abutting against the impact pin; a hammer tube for accommodating the hammer and having an unloading hole communicating between the inner and outer walls of the hammer tube, wherein the hammer reciprocates within the hammer tube under drive; a sliding sleeve sleeved on the outer wall of the hammer tube and reciprocating controllably along the outer wall of the hammer tube, the sliding sleeve having a first state exposing the unloading hole and a second state closing the unloading hole; and a transmission assembly for transmitting the displacement of the impact pin to the sliding sleeve.

[0005] According to the technical solution of this application, by setting a buffer ring and an impact pin with a shoulder, the linear movement of the impact pin toward the hammer tube is buffered, so that the displacement of the impact pin can be smoothly transmitted to the sliding sleeve through the transmission component, thereby controlling the opening and closing of the unloading hole on the hammer tube, and avoiding the high-frequency vibration of the impact pin from affecting the sliding sleeve, transmission component and other related motion mechanisms. Attached Figure Description

[0006] This application will be more fully understood by referring to the following detailed description of specific embodiments in conjunction with the accompanying drawings, in which the same reference numerals refer to the same elements in the views. Wherein:

[0007] Figure 1 This is a cross-sectional schematic diagram of an embodiment of a power tool, wherein the upper half of the diagram, with the axis as the boundary, shows the compressed position of the impact pin and the transmission assembly, and the lower half shows the uncompressed position of the impact pin and the transmission assembly.

[0008] Figure 2 This is a perspective view of one embodiment of the impact pin of a power tool;

[0009] Figure 3 This is a perspective view of one embodiment of the drive ring of a power tool; and

[0010] Figure 4 This is a cross-sectional view of another embodiment of the power tool, wherein the upper half of the diagram, with the axis as the boundary, shows the compressed position of the impact pin and the transmission assembly, and the lower half shows the uncompressed position of the impact pin and the transmission assembly. Detailed Implementation

[0011] The present application will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of the present application more complete and similar, and to fully convey the concept of the present application to those skilled in the art.

[0012] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, this application still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, thereby obtaining more other embodiments of this application that may not be directly mentioned herein.

[0013] See also Figure 1-3The illustration shows an embodiment of a power tool. The power tool generally includes a housing 100 and a plurality of components disposed within the housing. Specifically, it includes a drill bit 191, an impact pin 120, a buffer ring 130, a hammer 140, a hammer tube 150, a piston rod 192, and a transmission assembly 200 that has a kinematic relationship with the plurality of components, arranged generally in left-to-right order as shown in the illustration within the housing 100. The connections or assembly relationships therebetween will be further described below.

[0014] See also Figure 1-3 A radially protruding first stop 111 is provided on the inner wall of the housing 100, and a radially protruding shoulder 121 is provided in the middle section of the impact pin 120. A buffer ring 130 is fitted onto the impact pin 120 and positioned between the first stop 111 and the shoulder 121 of the impact pin 120 within the housing 100. When the power tool is brought close to the workpiece, the drill bit 191 retracts into the housing 100 from left to right as shown in the diagram, simultaneously pressing the impact pin 120 back until its tip 121 abuts against the first stop 111 of the housing. This is considered the endpoint of the retraction of the drill bit 191 and the impact pin 120. During this retraction process, the impact pin 120 first contacts the buffer ring 130, and only after being buffered by the buffer ring does it abut against the first stop 111, thus effectively eliminating the high-frequency vibration of the impact pin 120.

[0015] The hammer 140 abuts against the impact pin 120 on the side opposite to the drill bit 191. The hammer tube 150 is configured as a hollow tubular structure to house the hammer 140. As shown, the hammer 140 is slidably fitted to the left side of the hammer tube 150, and the piston rod 192 is slidably fitted to the right side of the hammer tube 150. Under drive, the piston rod 192 reciprocates within the hammer tube 150, thereby controllably forming a high-pressure gas chamber within the hollow tube of the hammer tube 150. The pressure generated by the gas within the chamber drives the hammer 140 to reciprocate within the hammer tube 150.

[0016] The hammer tube 150 shown in the figure has an unloading hole 151 on its right side, connecting the inner and outer walls of the hammer tube 150, forming part of the control component for the aforementioned high-pressure gas chamber. A sliding sleeve 160 is fitted onto the outer wall of the hammer tube 150, forming another part of the control component for the aforementioned high-pressure gas chamber. When driven, the sliding sleeve 160 reciprocates along the outer wall of the hammer tube 150, resulting in a first state where the unloading hole 151 is exposed, in which case a high-pressure gas chamber cannot be formed; and a second state where the unloading hole 151 is closed, in which case a high-pressure gas chamber can be formed.

[0017] In addition, the transmission assembly 200 serves as a motion transmission relay for the aforementioned components, used to transmit the displacement of the impact pin 120 to the sliding sleeve 160, thereby enabling control over the formation of the high-pressure gas chamber.

[0018] In this arrangement, the power tool of this application achieves buffering of the linear motion of the impact pin toward the hammer tube by setting a buffer ring and an impact pin with a shoulder. This allows the displacement of the impact pin to be smoothly transmitted to the sliding sleeve through the transmission component, thereby controlling the opening and closing of the unloading hole on the hammer tube. This avoids the high-frequency vibration of the impact pin from affecting the sliding sleeve, transmission component and other related moving mechanisms, effectively improving the life of parts and enhancing the reliability of the tool.

[0019] The following will continue to describe the structure and connection relationships of the various components in this power tool. Furthermore, for further improvements in reliability, usability, economy, or other aspects, additional components may be added, as illustrated below.

[0020] First, the transmission assembly in the foregoing embodiments will be described in detail. This transmission assembly 200 may include a transmission ring 210, the diameter of which is smaller than the diameter of the impact pin 120; and the end of the impact pin 120 has a boss 122 that mates with the inner hole 211 of the transmission ring 210. This arrangement provides a simple and reliable connection and transmission method between the impact pin and the transmission assembly. Through the engagement of the boss 122 at the end of the impact pin 120 with the inner hole 211 of the transmission ring 210, axial assembly and radial limiting are achieved, allowing for accurate and stable transmission of the impact pin's displacement changes to the rear end of the power tool.

[0021] Based on this, the hammer tube 150 shown in the figure may also have at least two openings 152 on its left side, and the transmission ring 210 includes at least two radially protruding tabs 212 on its outer periphery. In this arrangement, the tabs 212 will extend out of the hammer tube 150 through the openings 152 and are used to transmit the displacement of the transmission ring 210 to the sliding sleeve 160. Optionally, the openings on the hammer tube 150 can be directly set as notches opening from the leftmost side of the hammer tube 150, which makes it easier to assemble the tabs into the openings from their ends.

[0022] To achieve a good seal for the unloading hole 151, the sliding sleeve 160 is typically made of metal and has a tight fit with the hammer tube. In this case, for cost and other considerations, it is not advisable to set it to have an excessively long axial length. Therefore, the transmission assembly 200 may also include a lighter and more cost-effective transmission sleeve 220 as a transmission transfer part. A radially protruding second stop 161 may also be provided on the outer wall of the sliding sleeve 160. The transmission sleeve 220 is sleeved on the sliding sleeve 160 and axially limited to the first side of the second stop 161. In this arrangement, the transmission sleeve 220 can transmit the displacement of the tab 212 to the sliding sleeve 160.

[0023] Meanwhile, an elastic element 170 that is axially limited to the second side of the second stop portion 161 may also be provided, which serves as a reset element for the sliding sleeve 160 and can push the sliding sleeve 160 to a first state with the unloading hole 151 exposed when no pressure is applied.

[0024] In a cost-effectiveness context, the transmission sleeve 220 is typically made of plastic. Since the transmission portion of the transmission ring 210 towards the rear of the tool mainly consists of its tab 212, it has a small contact area and relatively high pressure with the subsequent transmission components. To prevent damage to the plastic transmission sleeve 220, the transmission assembly 200 may also include a metal transmission ring 231, disposed between the transmission sleeve 220 and the transmission ring 210. This metal transmission ring 231 can withstand the greater pressure on the tab 212 side and, with a larger contact area, more smoothly transmit the pressure to the sliding sleeve 160, thereby also transmitting the displacement of the tab 212 to the sliding sleeve 160.

[0025] See Figure 4 As another embodiment, a plastic transmission ring 232 can be directly provided on the outer periphery of the transmission ring 210 via a protrusion 212. The plastic transmission ring 232 protrudes axially from the protrusion 212 toward the sliding sleeve 160. This plastic transmission ring 232 directly achieves a larger contact area to transmit pressure more smoothly to the sliding sleeve 160, and thus also transmits the displacement of the protrusion 212 to the sliding sleeve 160. In addition, since it forms an integral part with the protrusion, it does not need to withstand impact, so it is not required to be made of metal, which can effectively reduce costs. On this basis, a buffer ring can also be added between the plastic transmission ring 232 and the sliding sleeve 160 to further mitigate the impact.

[0026] The following also combines Figure 1-3 The description then expands to include modifications to other components in power tools.

[0027] For example, considering that the buffering scheme, in which the buffer ring 130 directly receives the impact and compression of the impact pin 120 and the first stop 111 of the housing, requires high material quality for the buffer ring 130 and has a short service life, it is also possible to set a first metal plate 180a between the buffer ring 130 and the shoulder 121 of the impact pin 120, and a second metal plate 180b between the buffer ring 130 and the first stop 111 in the housing 100, so as to achieve partial pressure bearing and vibration reduction.

[0028] For example, to improve the fitting accuracy between the first stop 111 and the shoulder 121, the first stop 111 can be arranged circumferentially around the inner wall of the housing 100, and the shoulder 121 can be arranged circumferentially around the middle section of the impact pin 120. In this case, the probability of misfitting will be greatly reduced. For similar considerations, the second stop 161 can also be arranged circumferentially around the outer wall of the sliding sleeve 160.

[0029] The above specific embodiments are for illustrative purposes only and are not intended to limit the scope of this application. To illustrate relative positional relationships, relative directional terms such as left-right and up-down are used in this application, and are not intended to limit absolute positions. Those skilled in the art can make various changes and modifications to the technical solutions of this application without departing from the scope of this application; therefore, all equivalent technical solutions also fall within the scope of this application, and the patent protection scope of this application should be defined by the claims.

Claims

1. A power tool, characterized in that, include: The housing (100) has a radially protruding first stop (111) on its inner wall. An impact pin (120) is disposed within the housing (100), and the middle section of the impact pin (120) has a radially protruding shoulder (121). A buffer ring (130) is sleeved on the impact pin (120) and disposed between the first stop (111) inside the housing (100) and the shoulder (121) of the impact pin (120); A hammer (140) is disposed within the housing (100) and abuts against the impact pin (120). Hammer tube (150) is used to accommodate the hammer (140) and has an unloading hole (151) that connects the inner wall and the outer wall of the hammer tube (150). The hammer (140) is driven to reciprocate within the hammer tube (150). A sliding sleeve (160) is fitted onto the outer wall of the hammer tube (150) and reciprocates in a controlled manner along the outer wall of the hammer tube (150). The sliding sleeve (160) has a first state in which the unloading hole (151) is exposed, and a second state in which the unloading hole (151) is closed; and A transmission assembly (200) for transmitting the displacement of the impact pin (120) to the sliding sleeve (160).

2. The power tool according to claim 1, characterized in that, The transmission assembly (200) includes a transmission ring (210) whose inner hole (211) has a diameter smaller than that of the impact pin (120); the end of the impact pin (120) has a boss (122) that engages with the inner hole (211) of the transmission ring (210).

3. The power tool according to claim 2, characterized in that, The hammer tube (150) has at least two openings (152) on its first end (150a), and the transmission ring (210) has at least two radially protruding tabs (212) on its outer periphery. The tabs (212) extend out of the hammer tube (150) through the openings (152) and are used to transmit the displacement of the transmission ring (210) to the sliding sleeve (160).

4. The power tool according to claim 3, characterized in that, The transmission assembly (200) further includes a transmission sleeve (220); the outer wall of the sliding sleeve (160) has a second stop portion (161) that protrudes radially; wherein the transmission sleeve (220) is sleeved on the sliding sleeve (160) and is axially limited to the first side of the second stop portion (161), and the transmission sleeve (220) transmits the displacement of the tab (212) to the sliding sleeve (160).

5. The power tool according to claim 4, characterized in that, It also includes an elastic element (170) which is axially limited to the second side of the second stop (161) and pushes the sliding sleeve (160) to a first state with the unloading hole (151) exposed when no pressure is applied.

6. The power tool according to claim 4, characterized in that, The transmission sleeve (220) is made of plastic, and the transmission assembly (200) further includes a metal transmission ring (231) disposed between the transmission sleeve (220) and the transmission ring (210); wherein the metal transmission ring (231) transmits the displacement of the tab (212) to the sliding sleeve (160).

7. The power tool according to claim 4, characterized in that, It also includes a transmission ring (232) sleeved on the outer periphery of the transmission ring (210) via the tab (212), the transmission ring (232) protruding axially from the tab (212) toward the sliding sleeve (160); wherein the transmission ring (232) transmits the displacement of the tab (212) to the sliding sleeve (160).

8. The power tool according to any one of claims 1 to 7, characterized in that, Also includes: A first metal plate (180a) is disposed between the buffer ring (130) and the shoulder (121) of the impact pin (120); and / or a second metal plate (180b) is disposed between the buffer ring (130) and the first stop (111) inside the housing (100).

9. The power tool according to any one of claims 1 to 7, characterized in that, The first stop (111) is disposed circumferentially around the inner wall of the housing (100), and / or the shoulder (121) is disposed circumferentially around the middle section of the impact pin (120).

10. The power tool according to any one of claims 4 to 7, characterized in that, The second stop (161) is provided circumferentially around the outer wall of the sliding sleeve (160).

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