Impact tool

Abstract

The utility model discloses an impact tool. The impact tool includes a housing, a drive unit, and a ring. The shell is provided with a mounting cavity. The driving unit comprises a driving mechanism and an output mechanism, the driving mechanism is installed in the installation cavity, the output mechanism is connected to the driving mechanism in a driven mode, and one end of the output mechanism is connected with a screwdriver bit. The annular piece is installed on the periphery of the end, close to the output mechanism, of the driving mechanism, and the annular piece can move in the installation cavity in the direction in which the driving mechanism drives the output mechanism to move. In order to reduce the friction force between the parts in the mounting cavity and between the parts and the inner wall of the mounting cavity, the parts and the inner wall of the mounting cavity are coated with a lubricant, and the annular piece is driven by the driving mechanism to move so as to coat the lubricant between the inner wall of the mounting cavity and the parts. And the lubricant is prevented from accumulating in the mounting cavity.

Description

Technical Field

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

[0002] Impact tools, such as impact drivers and impact wrenches, can continuously output torque to fasteners or intermittently apply torque and impact force to fasteners to screw in and out fasteners on materials such as wood, metal, and plastic.

[0003] The mechanical parts of the impact tool are installed in the installation cavity formed by the shell of the impact tool. In order to prevent the hammer of the impact tool from shaking in the radial direction, the existing impact tool is provided with a bearing, and the hammer is installed on the bearing to limit the movement of the hammer in the radial direction.

[0004] In order to reduce the friction between mechanical parts and between mechanical parts and the inner wall of the installation cavity, the mechanical parts and the inner wall of the installation cavity are coated with lubricant. However, the bearing has no sealing function, so too much lubricant will flow out of the housing. In order to prevent the lubricant from flowing out of the housing, the amount of lubricant applied to the mechanical parts and the inner wall of the installation cavity is small, which requires users to disassemble the impact tool regularly and apply lubricating oil to the surface of the mechanical parts. However, the mechanical connection inside the impact tool is tight and stable, so the disassembly work is difficult, and the assembly work requires strict requirements. If the mechanical parts are not assembled tightly, it will not be able to be used normally later.

[0005] In addition, if the impact tool has not been used for a long time, the lubricant in the installation cavity will gather at the bottom of the installation cavity. Then, at the initial start-up of the impact tool, the mechanical parts will make abnormal noises and run unsmoothly due to excessive friction. In severe cases, the mechanical parts may be damaged. Utility Model Content

[0006] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides an impact tool, the impact tool comprising:

[0007] A housing having a mounting cavity;

[0008] A driving unit, the driving unit comprising a driving mechanism and an output mechanism, the driving mechanism being mounted in the mounting cavity, the output mechanism being drivingly connected to the driving mechanism, and one end of the output mechanism being connected to a screwdriver bit;

[0009] An annular member is installed on the outer periphery of one end of the driving mechanism close to the output mechanism, and the annular member is configured to be able to move in the installation cavity along the direction in which the driving mechanism drives the output mechanism to move.

[0010] According to an embodiment of the present invention, the housing includes a mounting portion and a gripping portion, the mounting portion forms the mounting cavity, and a portion of the bottom wall of the mounting portion extends downward by a preset length to form the gripping portion.

[0011] According to an embodiment of the utility model, the driving mechanism includes a power input component and a rotating hammer component, the rotating hammer component includes a main shaft, a hammer member and a clutch member, the main shaft is rotatably connected to the power input component, the end of the main shaft away from the power input component passes through the hammer member, the output mechanism is located at the end of the main shaft away from the power input component and opposite to the hammer member, the hammer member is configured to be able to approach the output mechanism along the axial direction of the main shaft and engage with the output mechanism and move away from the output mechanism and separate from the output mechanism, the clutch member is arranged between the main shaft and the hammer member in a manner that can drive the hammer member to engage with or separate from the output mechanism, the annular member is sleeved on the outer periphery of the hammer member, and the annular member is gap-matched with the inner wall of the mounting cavity.

[0012] According to an embodiment of the utility model, the power input component includes a driving component and a deceleration component, the driving component has an output shaft, the deceleration component includes a center wheel, planetary gears, a planetary carrier and an inner ring gear, the center wheel is mounted on the output shaft, the inner ring gear is fixedly mounted on the mounting cavity, the planetary gears are mounted on the planetary carrier, and the main shaft is connected to the planetary carrier, and the planetary gears remain engaged with the inner ring gear and the center wheel at the same time.

[0013] According to an embodiment of the utility model, the output mechanism includes an output portion and a connecting portion, one end of the output portion expands radially to form the connecting portion, the connecting portion is arranged opposite to the hammer, and the output portion is connected to the bit.

[0014] According to one embodiment of the utility model, the output mechanism forms at least one anvil protrusion at the connecting portion, and the output mechanism forms at least one notch between the connecting portion and the anvil protrusion, and the hammering member forms a hammering protrusion on one side of the connecting portion, and the hammering protrusion is configured to be able to extend into and out of the notch.

[0015] According to one embodiment of the utility model, the output mechanism forms a plug-in slot, the main shaft passes through the hammer member and is plugged into the plug-in slot, the main shaft can rotate in the plug-in slot, the hammer member forms a plug-in channel, and one end of the main shaft away from the power input component is plugged into the plug-in channel.

[0016] According to an embodiment of the utility model, the clutch component includes:

[0017] A guide structure, the guide structure comprising at least one pair of limit displacement grooves and a ball bearing, the limit displacement groove extending obliquely at the outer periphery of the main shaft, the limit displacement groove having a closed end and an open end, wherein the open end is closer to the output mechanism than the closed end, a pair of two limit displacement grooves are connected to each other through the open ends formed by each of them, the inner wall of a part of the plug-in channel is recessed radially outward to form a mounting groove, the ball bearing is mounted between the limit displacement groove and the mounting groove, and the ball bearing is configured to be able to move along the extension direction of the limit displacement groove and drive the hammer member to move along the axial direction of the main shaft;

[0018] An elastic member is in contact with an end face of the hammer member away from the output mechanism. When the hammer member moves in a direction away from the output mechanism, the elastic member undergoes elastic deformation and has a tendency to push the hammer member to return to its original position.

[0019] According to an embodiment of the present invention, the elastic member is sleeved on the main shaft.

[0020] According to an embodiment of the utility model, an annular groove is formed at one end of the hammer member close to the power input component, and part of the elastic member extends into the annular groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The schematic diagram of the structure of the impact tool of the utility model is shown.

[0022] Figure 2 A partial structural sectional view of the impact tool of the utility model is shown.

[0023] Figure 3 An exploded view of a portion of the structure of the impact tool of the utility model is shown. DETAILED DESCRIPTION

[0024] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0025] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0026] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0027] refer to Figures 1 to 3 An impact tool according to a preferred embodiment of the present invention will be described in detail below. The impact tool includes a housing 10, a driving unit 20 and a ring member 30.

[0028] The housing 10 has a mounting cavity 101, and the drive unit 20 includes a drive mechanism 21 and an output mechanism 22. The drive mechanism 21 is mounted in the mounting cavity 101. The output mechanism 22 is drivingly connected to the drive mechanism 21. One end of the output mechanism 22 is connected to a screwdriver, such as a wrench. The screwdriver acts on a fastener, such as a nut.

[0029] The annular member 30 is installed on the outer periphery of one end of the driving mechanism 21 close to the output mechanism 22 and seals the installation cavity 101. The annular member 30 is configured to be movable in the installation cavity 101 along the direction in which the driving mechanism 21 drives the output mechanism 22 to move.

[0030] In order to reduce the friction between the parts in the installation cavity 101 and between the parts and the inner wall of the installation cavity 101, lubricant is coated on the parts and the inner wall of the installation cavity 101, and the annular member 30 is driven by the driving mechanism 21 to move so that the gas in the installation cavity 101 flows, so that the lubricant in the installation cavity 101 flows in the installation cavity 101 under the action of the airflow to prevent the lubricant from accumulating in the installation cavity 101.

[0031] Preferably, the housing 10 includes a mounting portion 11 and a grip portion 12. The mounting portion 11 forms the mounting cavity 101, and a portion of the bottom wall of the mounting portion 11 extends downward by a preset length to form the grip portion 12, which provides a gripping portion for the staff.

[0032] Preferably, the driving mechanism 21 includes a power input component 211 and a rotary hammer component 212 .

[0033] The rotary hammer component 212 includes a main shaft 2121, a hammer 2122 and a clutch member 2123. The main shaft 2121 is rotatably connected to the power input component 211. One end of the main shaft 2121 away from the power input component 211 passes through the hammer 2122. The output mechanism 22 is located at one end of the main shaft 2121 away from the power input component 211 and opposite to the hammer 2122. The hammer 2122 is configured to be able to approach the output mechanism 22 along the axial direction of the main shaft 2121 to engage with the output mechanism 22 and to be away from the output mechanism 22 to be separated from the output mechanism 22. The clutch member 2123 is arranged between the main shaft 2121 and the hammer 2122 in a manner that can drive the hammer 2122 to engage with or separate from the output mechanism 22.

[0034] When the resistance encountered by the screwdriver bit is within a preset range, the clutch component 2123 drives the hammer 2122 to remain engaged with the output mechanism 22, and then the power input component 211 drives the output mechanism 22 to rotate through the rotating hammer component 212, so that the screwdriver bit drives the fastener to rotate.

[0035] When the resistance encountered by the screwdriver bit is greater than a preset range, the rotation of the output mechanism 22 and the screwdriver bit is blocked, so that the hammer piece 2122 moves along the axial direction of the main shaft 2121 in a direction away from the output mechanism 22 under the action of the clutch component 2123 to separate from the output mechanism 22. At this time, the output mechanism 22 remains stationary. Then, after the hammer piece 2122 moves a predetermined distance, the clutch component 2123 drives the hammer piece 2122 to rotate close to the output mechanism 22 to apply an impact force in the rotation direction to the output mechanism 22, so that the screwdriver bit can drive the fastener to overcome the resistance.

[0036] It is worth mentioning that the annular member 30 is sleeved on the outer periphery of the hammer member 2122, and when the hammer member 2122 moves along the axial direction of the main shaft 2121 and rotates around the axis of the main shaft 2121, the annular member 30 moves simultaneously with the hammer member 2122. The annular member 30 is in clearance fit with the inner wall of the installation cavity 101. In this way, the annular member 30 can also limit the hammer member 2122 in the radial direction to prevent the hammer member 2122 from moving in the radial direction.

[0037] When the annular member 30 moves along the axial direction of the main shaft 2121 with the hammer 2122 in a direction away from the output mechanism 22, the space between the hammer 2122 and the power input component 211 is compressed, and the gas between the hammer 2122 and the power input component 211 flows from the gap between the main shaft 2121 and the hammer 2122 to the space between the hammer 2122 and the output mechanism 22. When the annular member 30 moves along the axial direction of the main shaft 2121 with the hammer 2122 in a direction close to the output mechanism 22, the space between the hammer 2122 and the power input component 211 is expanded, and the gas between the hammer 2122 and the output mechanism 22 flows from the gap between the main shaft 2121 and the hammer 2122 to the space between the hammer 2122 and the power input component 211.

[0038] That is, when the annular member 30 reciprocates along the axial direction of the main shaft 2121 with the hammer member 2122, the hammer member 2122 and the annular member 30 can reciprocately suck the gas in the installation cavity 101, so that the lubricant on the parts in the installation cavity 101 flows in the installation cavity 101 under the action of the gas flow. Preferably, the annular member 30 is made of a flexible material, so that the annular member 30 can seal the installation cavity 101 to prevent the lubricant from flowing out of the installation cavity 101.

[0039] In one example, the ring 30 is implemented as a rubber ring.

[0040] Preferably, the power input component 211 comprises a driving member 2111. The driving member 2111 has an output shaft 21111.

[0041] In one embodiment, the output shaft 21111 is connected to an end of the main shaft 2121 away from the hammer 2122 .

[0042] In a preferred embodiment, the power input component 211 further includes a deceleration member 2112. The deceleration member 2112 is mounted on the output shaft 21111, and the driving force generated by the driving member 2111 is output to the deceleration member 2112 through the output shaft 21111. One end of the main shaft 2121 away from the hammer 2122 is connected to the deceleration member 2112. The driving force generated by the driving member 2111 is decelerated by the deceleration member 2112 and transmitted to the main shaft 2121.

[0043] In one example, the driving member 2111 is implemented to include a motor.

[0044] In one embodiment, the deceleration member 2112 includes a center wheel 21121, planetary gears 21122, a planetary carrier 21123, and an inner gear ring 21124. The center wheel 21121 is mounted on the output shaft 21111. The inner gear ring 21124 is fixedly mounted on the mounting cavity 101. The planetary gears 21122 are mounted on the planetary carrier 21123, and the main shaft 2121 is connected to the planetary carrier 21123. The planetary gears 21122 are kept in meshing with the inner gear ring 21124 and the center wheel 21121 at the same time. In this way, the driving component 2111 drives the center wheel 21121 to rotate via the output shaft 21111, the planetary gear 21122 meshing with the center wheel 21121 rotates, and the planetary gear 21122 drives the planetary carrier 21123 to rotate axially around the center wheel 21121 under the limiting action of the inner ring gear 21124, so that the main shaft 2121 can obtain a smaller rotation speed and a larger torque than the output shaft 21111.

[0045] Specifically, the output mechanism 22 includes an output portion 221 and a connecting portion 222. One end of the output portion 221 expands radially to form the connecting portion 222. The connecting portion 222 is disposed opposite to the hammer 2122, and the output portion 221 is connected to the screwdriver bit.

[0046] It is worth mentioning that the output mechanism 22 forms at least one anvil protrusion 223 at the connecting portion 222, and the output mechanism 22 forms at least one notch 2201 between the connecting portion 222 and the anvil protrusion 223. The hammering member 2122 forms a hammering protrusion 21221 on one side of the connecting portion 222. When the hammering protrusion 21221 extends into the notch 2201, the hammering member 2122 can rotate until the hammering protrusion 21221 abuts against the anvil protrusion 223, and at this time, the hammering member 2122 is engaged with the output mechanism 22; when the hammering protrusion 21221 is pulled out of the notch 2201, the hammering member 2122 is separated from the output mechanism 22.

[0047] Preferably, the output mechanism 22 forms a plug-in slot 2202, and the spindle 2121 penetrates the hammer member 2122 and is plugged into the plug-in slot 2202. The spindle 2121 can rotate in the plug-in slot 2202, so that the impact tool has a compact structure. Preferably, a bearing is installed between the plug-in slot 2202 and the spindle 2121, and the bearing can reduce the friction between the spindle 2121 and the output mechanism 22, so as to extend the service life of the spindle 2121 and the output mechanism 22.

[0048] It is understandable that the hammer member 2122 forms a plug-in channel 212201 . One end of the main shaft 2121 away from the power input component 211 is plugged into the plug-in channel 212201 .

[0049] Specifically, the clutch member 2123 includes a guide structure 21231 and an elastic member 21232. The guide structure 21231 includes at least a pair of limiting displacement grooves 212311 and a ball bearing 212312. The limiting displacement groove 212311 extends obliquely at the outer periphery of the main shaft 2121. The limiting displacement groove 212311 has a closed end 2123111 and an open end 2123112, wherein the open end 2123112 is closer to the output mechanism 22 than the closed end 2123111. A pair of the limiting displacement grooves 212311 are connected to each other through the open ends 2123112 formed respectively, so that the pair of limiting displacement grooves 212311 are V-shaped. The inner wall of a part of the insertion channel 212201 is recessed radially outward to form the mounting groove 212202. The ball 212312 is installed between the limiting displacement groove 212311 and the installation groove 212202, and the ball 212312 is configured to be able to move along the extension direction of the limiting displacement groove 212311 and drive the hammer 2122 to move along the axial direction of the main shaft 2121. The elastic member 21232 abuts against an end surface of the hammer 2122 away from the output mechanism 22. When the hammer 2122 moves in a direction away from the output mechanism 22, the elastic member 21232 undergoes elastic deformation and has a tendency to push the hammer 2122 to reset.

[0050] When the ball 212312 is located at the open end 2123112, the ball 212312 drives the hammer protrusion 21221 formed by the hammer member 2122 to extend into the notch 2201. At this time, if the resistance encountered by the screwdriver bit is within a preset range, the rotating hammer member 212 driven by the power input member 211 drives the output mechanism 22 to rotate, so that the screwdriver bit drives the fastener to rotate.

[0051] When the resistance encountered by the screwdriver bit is greater than a preset range, the output mechanism 22 and the screwdriver bit are blocked from rotating, and the output mechanism 22 prevents the hammer member 2122 from continuing to rotate with the spindle 2121 through the anvil protrusion 223, so that the ball 212312 rolls from the open end 2123112 toward the closed end 2123111, and then the ball 212312 drives the hammer member 2122 to move away from the output mechanism 22, so that the elastic member 21232 undergoes elastic deformation and the hammer member 2122 is separated from the output mechanism 22; When the ball 212312 moves to the closed end 2123111, the hammer member 2122 rotates close to the output mechanism 22 under the elastic action of the elastic member 21232 and the guiding action of the guide structure 21231. After the hammer protrusion 21221 extends into the notch 2201, the rotating hammer member 2122 applies an impact force in the rotation direction to the anvil protrusion 223. In this way, the hammer member 2122 repeatedly engages and separates with the output mechanism 22 under the action of the clutch member 2123, so that the screwdriver bit can drive the fastener to overcome resistance and be tightened or loosened.

[0052] Preferably, the elastic member 21232 is sleeved on the main shaft 2121 , so that the elastic member 21232 can be extended and retracted along the axial direction of the main shaft 2121 , and the main shaft 2121 can improve the stability of the elastic member 21232 when it is extended and retracted.

[0053] Preferably, an annular groove 212203 is formed at one end of the hammer member 2122 close to the power input component 211. Part of the elastic member 21232 extends into the annular groove 212203, so that each structure in the installation cavity 101 is compact.

[0054] In one example, the elastic member 21232 is implemented as a spring.

[0055] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. An impact tool, characterized in that The impact tool comprises: A housing having a mounting cavity; A driving unit, the driving unit comprising a driving mechanism and an output mechanism, the driving mechanism being mounted in the mounting cavity, the output mechanism being drivingly connected to the driving mechanism, and one end of the output mechanism being connected to a screwdriver bit; An annular member is installed on the outer periphery of one end of the driving mechanism close to the output mechanism, and the annular member is configured to be able to move in the installation cavity along the direction in which the driving mechanism drives the output mechanism to move.

2. The impact tool according to claim 1, characterized in that: The housing comprises a mounting portion and a gripping portion, wherein the mounting portion forms the mounting cavity, and a portion of a bottom wall of the mounting portion extends downward by a preset length to form the gripping portion.

3. The impact tool according to claim 1, characterized in that: The driving mechanism includes a power input component and a rotating hammer component, and the rotating hammer component includes a main shaft, a hammer member and a clutch member. The main shaft is rotatably connected to the power input component, and one end of the main shaft away from the power input component passes through the hammer member. The output mechanism is located at the end of the main shaft away from the power input component and opposite to the hammer member. The hammer member is configured to be able to approach the output mechanism along the axial direction of the main shaft to engage with the output mechanism and to be away from the output mechanism to separate from the output mechanism. The clutch member is arranged between the main shaft and the hammer member in a manner that can drive the hammer member to engage with or separate from the output mechanism. The annular member is sleeved on the outer periphery of the hammer member, and the annular member is gap-matched with the inner wall of the mounting cavity.

4. The impact tool according to claim 3, characterized in that: The power input component includes a driving component and a reduction component, the driving component has an output shaft, the reduction component includes a center wheel, planetary gears, a planetary carrier and an inner ring gear, the center wheel is mounted on the output shaft, the inner ring gear is fixedly mounted on the mounting cavity, the planetary gears are mounted on the planetary carrier, and the main shaft is connected to the planetary carrier, and the planetary gears remain engaged with the inner ring gear and the center wheel at the same time.

5. The impact tool according to claim 4, characterized in that: The output mechanism comprises an output portion and a connecting portion. One end of the output portion expands radially to form the connecting portion. The connecting portion is arranged opposite to the hammer member. The output portion is connected to the bit.

6. The impact tool according to claim 5, characterized in that: The output mechanism forms at least one anvil protrusion at the connecting portion, and at least one notch between the connecting portion and the anvil protrusion. The hammering member forms a hammering protrusion on one side of the connecting portion, and the hammering protrusion is configured to be able to extend into and out of the notch.

7. The impact tool according to claim 6, characterized in that: The output mechanism forms a plug-in slot, the main shaft passes through the hammer member and is plugged into the plug-in slot, the main shaft can rotate in the plug-in slot, the hammer member forms a plug-in channel, and one end of the main shaft away from the power input component is plugged into the plug-in channel.

8. The impact tool according to claim 7, characterized in that: The clutch component comprises: A guide structure, the guide structure comprising at least one pair of limit displacement grooves and a ball bearing, the limit displacement groove extending obliquely at the outer periphery of the main shaft, the limit displacement groove having a closed end and an open end, wherein the open end is closer to the output mechanism than the closed end, a pair of two limit displacement grooves are connected to each other through the open ends formed by each of them, the inner wall of a part of the plug-in channel is recessed radially outward to form a mounting groove, the ball bearing is mounted between the limit displacement groove and the mounting groove, and the ball bearing is configured to be able to move along the extension direction of the limit displacement groove and drive the hammer member to move along the axial direction of the main shaft; An elastic member is in contact with an end face of the hammer member away from the output mechanism. When the hammer member moves in a direction away from the output mechanism, the elastic member undergoes elastic deformation and has a tendency to push the hammer member to return to its original position.

9. The impact tool according to claim 8, characterized in that: The elastic member is sleeved on the main shaft.

10. The impact tool according to claim 9, characterized in that: An annular groove is formed at one end of the hammer member close to the power input component, and part of the elastic member extends into the annular groove.

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