Impact tool

Abstract

The utility model discloses an impact tool. An output shaft and an impact assembly are coaxially arranged. The transmission shaft comprises a first shaft body connected with the impact assembly and a second shaft body connected with the output shaft, the second shaft body is inserted into the first shaft body, the first shaft body is provided with a first abutting surface, and the second shaft body is provided with a second abutting surface; the planetary gear train sleeves the transmission shaft and is in linkage installation with the transmission shaft and the output shaft; the lock shaft assembly is arranged in the planetary gear train and arranged outside the transmission shaft in a sleeving mode. In the first state, the first abutting face abuts against the second abutting face, and the second shaft body and the lock shaft assembly are unlocked. And in the second state, the first abutting surface is separated from the second abutting surface, and the second shaft body is locked with the lock shaft assembly. Through the arrangement of the lock shaft assembly, the springback amount of the transmission shaft can be reduced, the striking effect is ensured, and the loss of the output torque of the output shaft is reduced.

Description

Technical Field

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

[0002] The impact tools currently on the market, such as impact screwdrivers, impact wrenches, impact drills, etc., all exert high-energy impact through their internal impact components to quickly complete the fastening or disassembly work. Among them, the transmission shaft is an important structure that transmits the impact force of the impact component to the output shaft. If the impact component and the transmission shaft are not properly matched, or the tightening force is too large, the transmission shaft may rebound or change position, thereby affecting the impact effect of the impact tool and reducing the torque output by the output shaft.

[0003] 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

[0004] The utility model aims to provide an impact tool, which can reduce the rebound amount of the transmission shaft, ensure the striking effect, and reduce the loss of the output torque of the output shaft.

[0005] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0006] An impact tool, comprising:

[0007] Impact components;

[0008] An output shaft, coaxially arranged with the impact assembly;

[0009] A transmission shaft, the transmission shaft comprising a first shaft body connected to the impact assembly and a second shaft body connected to the output shaft, the second shaft body being inserted into the first shaft body, the first shaft body being provided with a first abutting surface, and the second shaft body being provided with a second abutting surface;

[0010] A planetary gear train, sleeved on the outside of the transmission shaft and installed in linkage with the transmission shaft and the output shaft;

[0011] A shaft lock assembly is disposed in the planetary gear train and sleeved on the outside of the transmission shaft;

[0012] In the first state, the first abutting surface and the second abutting surface abut against each other, and the second shaft body and the shaft locking assembly are unlocked;

[0013] In the second state, the first abutting surface and the second abutting surface are separated, and the second shaft body is locked with the shaft locking assembly.

[0014] In one or more embodiments of the present utility model, a first limit block is provided on the first shaft body, and the shaft locking assembly includes:

[0015] A limiting ring, sleeved on the outside of the first shaft and partially located outside the second shaft;

[0016] A locking ring is sleeved on the outside of the second shaft body and located inside the limiting ring. The first shaft body, the locking ring and the limiting ring together form a receiving cavity. The locking ring is provided with a second limiting block along the circumferential direction. The first limiting block and the second limiting block are both arranged along the axial direction.

[0017] A limiting column, movably installed in the receiving cavity and arranged between the first limiting block and the second limiting block;

[0018] In the first state, the limiting post is separated from the limiting ring and / or the locking ring;

[0019] In the second state, the limiting post is in contact with the limiting ring and the locking ring.

[0020] In one or more embodiments of the present invention, the side wall of the locking ring is provided with a guide surface, and the guide surface is used to convert the circumferential rotation of the locking ring into the movement of the limiting column toward the limiting ring, so that the limiting column abuts against the limiting ring and the locking ring.

[0021] In one or more embodiments of the present invention, the second shaft body includes a first body inserted in the first shaft body, a second body installed in linkage with the planetary gear train, and a third body inserted in the output shaft, and the locking ring is sleeved on the first body.

[0022] In one or more embodiments of the present invention, the cross-section of the first body is non-circular, the locking ring is provided with a first mounting hole matched with the first body, and the inner wall of the first mounting hole is aligned with the outer wall of the first body.

[0023] In one or more embodiments of the present invention, the planetary gear train includes an inner ring gear, a sun gear disposed on the second body, and planetary gears disposed between the inner ring gear and the sun gear, and the planetary gears are mounted on the output shaft.

[0024] In one or more embodiments of the present invention, the sun gear and the second body are separately or integrally provided.

[0025] In one or more embodiments of the present invention, a second mounting hole and a third mounting hole are provided on the first shaft body, the impact assembly is inserted in the second mounting hole, the second shaft body is inserted in the third mounting hole, the first abutment surface is arranged in the third mounting hole, and the second abutment surface is arranged on the first body.

[0026] In one or more embodiments of the present invention, the limiting ring includes a first ring body sleeved on the first shaft body, a second ring body located outside the second shaft body, and an extension portion extending toward the second shaft body, and the first shaft body, the second ring body, the extension portion, and the locking ring enclose a receiving cavity.

[0027] In one or more embodiments of the present invention, the impact assembly includes an impact rod and a striking block sleeved on the outside of the impact rod, the striking block is provided with a receiving groove, the impact rod is inserted into the first shaft body, and the first shaft body is partially received in the receiving groove.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] The utility model provides an impact tool, which can reduce the rebound amount of the transmission shaft through the arrangement of a shaft locking component, ensure the striking effect, and reduce the loss of the output torque of the output shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic cross-sectional view of an impact tool in one embodiment of the utility model;

[0032] Figure 2 It is a cross-sectional structural schematic diagram of a transmission shaft and a locking shaft assembly in one embodiment of the utility model;

[0033] Figure 3 for Figure 2 The cross-sectional structural diagram of AA in the first state;

[0034] Figure 4 for Figure 3 A magnified view of the local structure at point A in the middle;

[0035] Figure 5 for Figure 2 A schematic cross-sectional view of the BB in the first state;

[0036] Figure 6 for Figure 2 The cross-sectional structural diagram of AA in the second state;

[0037] Figure 7 for Figure 6 A magnified view of the local structure at B in the middle;

[0038] Figure 8 for Figure 2 A schematic cross-sectional view of the structure of the middle BB in the second state;

[0039] Fig. 9 for Figure 1 Schematic diagram of the cross-sectional structure at CC in the middle. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0043] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.

[0044] Reference Figure 1 Combined with Figure 3 to Figure 8 As shown, the impact tool in this embodiment includes: an impact assembly 1, an output shaft 2, a transmission shaft 3, a planetary gear train 4, and a locking shaft assembly 5.

[0045] Among them, the output shaft 2 is coaxially arranged with the impact assembly 1; the transmission shaft 3 includes a first shaft body 31 connected to the impact assembly 1 and a second shaft body 32 connected to the output shaft 2, the second shaft body 32 is inserted into the first shaft body 31, the first shaft body 31 is provided with a first abutting surface 310, and the second shaft body 32 is provided with a second abutting surface 320; the planetary gear train 4 is sleeved on the outside of the transmission shaft 3 and is installed in linkage with the transmission shaft 3 and the output shaft 2; the locking shaft assembly 5 is arranged in the planetary gear train 4 and sleeved on the outside of the transmission shaft 3; in the first state, the first abutting surface 310 and the second abutting surface 320 abut against each other, and the second shaft body 32 is unlocked from the locking shaft assembly 5; in the second state, the first abutting surface 310 and the second abutting surface 320 are separated, and the second shaft body 32 is locked with the locking shaft assembly 5.

[0046] In the first state, the transmission shaft 3 is unlocked from the shaft locking assembly 5, and the transmission shaft 3 can rotate freely around the axis in the planetary gear train 4 without restriction, so the impact assembly 1 can transmit the impact force to the first shaft body 31, then to the second shaft body 32, and then to the output shaft 2. When the transmission shaft 3 rebounds, the rebound force is transmitted to the second shaft body 32. Since the second shaft body 32 is locked with the shaft locking assembly 5, that is, the transmission shaft 3 is locked with the shaft locking assembly 5, the transmission shaft 3 can no longer rotate freely around the axis in the planetary gear train 4, and excessive rebound of the transmission shaft 3 can be avoided. Therefore, by setting the shaft locking assembly 5, the rebound amount of the transmission shaft 3 can be reduced, the striking effect can be ensured, and the loss of the output torque of the output shaft 2 can be reduced.

[0047] Reference Figure 1 Combined with Fig. 9 As shown, the impact assembly 1 in this embodiment includes an impact rod 11 and a striking block 12 sleeved on the outside of the impact rod 11, and a receiving groove 121 is provided on the striking block 12. The impact rod 11 is inserted into the first shaft body 31, and the first shaft body 31 is partially received in the receiving groove 121. When it is necessary to transmit the impact force of the impact assembly 1 to the transmission shaft 3, the first shaft body 31 abuts against the side wall of the receiving groove 121, and the striking block 12 drives the first shaft body 31 to rotate around the axis. When the first abutting surface 310 and the second abutting surface 320 abut against each other, the first shaft body 31 can drive the second shaft body 32 to rotate, thereby transmitting the impact force of the impact assembly 1 to the transmission shaft 3.

[0048] Specifically, refer to Figure 1 Combined with Figure 5 , Figure 8As shown, in this embodiment, a first limit block 511 is provided on the first shaft body 31, and the shaft lock assembly 5 includes: a limit ring 51, a lock ring 52, and a limit column 53. Among them, the limit ring 51 is sleeved on the outside of the first shaft body 31 and is partially located outside the second shaft body 32; the lock ring 52 is sleeved on the outside of the second shaft body 32 and is located inside the limit ring 51, the first shaft body 31, the lock ring 52 and the limit ring 51 are enclosed to form a receiving cavity 50, the lock ring 52 is provided with a second limit block 521 along the circumferential direction, and the first limit block 511 and the second limit block 521 are both arranged along the axial direction; the limit column 53 is movably installed in the receiving cavity 50 and is arranged between the first limit block 511 and the second limit block 521; in the first state, the limit column 53 is separated from the limit ring 51 and / or the lock ring 52; in the second state, the limit column 53 is in contact with the limit ring 51 and the lock ring 52.

[0049] Since the limiting column 53 is separated from the limiting ring 51 and / or the locking ring 52, the locking shaft assembly 5 does not limit the rotation of the second shaft body 32, and the striking force of the impact assembly 1 can be transmitted to the first shaft body 31 and then to the second shaft body 32. Since the limiting column 53 is in contact with the limiting ring 51 and the locking ring 52, the locking ring 52 can no longer rotate in the original direction. When the locking ring 52 is restricted from rotating, the second shaft body 32 is also restricted from rotating. At this time, the first abutting surface 310 is separated from the second abutting surface 320, so the rotation of the second shaft body 32 cannot be transmitted to the first shaft body 31, thereby limiting the rebound amount of the transmission shaft 3.

[0050] The lock ring 52 may be fixedly mounted on the second shaft 32, and the lock ring 52 and the second shaft 32 may be integrally or separately arranged. When the lock ring 52 and the second shaft 32 are separately arranged, the lock ring 52 may be fixedly mounted on the second shaft 32; or, the lock ring 52 may be movably mounted on the second shaft 32 but may rotate in coordination with the second shaft 32.

[0051] Further, in order to make the second shaft 32 and the lock ring 52 rotate in coordination, refer to Figure 5 , Figure 8 As shown, the cross section of the end of the second shaft body 32 (i.e., the first body 321 described later) on which the locking ring 52 is installed in this embodiment is non-circular, and the locking ring 52 is provided with a first mounting hole 523 that matches the first body 321, and the inner wall of the first mounting hole 523 is aligned with the outer wall of the first body 321. Exemplarily, the cross section of the first body 321 can be a triangle, a quadrilateral, or a special shape, and the first mounting hole 523 can be a triangle, a quadrilateral, or a special shape. The size of the first mounting hole 523 needs to be slightly larger than the cross-sectional size of the first body 321.

[0052] In order to prevent the limiting column 53 from being separated from the receiving cavity 50, refer to Figure 1 Combined with Figure 5 , Figure 8 As shown, the limiting ring 51 in this embodiment includes a first ring body 511 sleeved on the first shaft body 31, a second ring body 512 located outside the second shaft body 32, and an extension portion 513 extending toward the second shaft body 32. The first shaft body 31, the second ring body 512, the extension portion 513, and the lock ring 52 enclose a receiving cavity 50. Specifically, the size of the inner wall of the extension portion 513 in this embodiment is larger than the size of the outer wall of the second body 322 and smaller than the size of the outer wall of the lock ring 52. According to this design, when the limiting column 53 moves in the receiving cavity 50, the length of the limiting column 53 is smaller than the distance between the end face of the first shaft body 31 facing the extension portion 513 and the end face of the extension portion 513 facing the first shaft body 31. Therefore, the limiting column 53 can be always limited in the receiving cavity 50 by the first shaft body 31 and the extension portion 513.

[0053] Reference Figure 5 , Figure 8 As shown, the side wall of the lock ring 52 in this embodiment is provided with a guide surface 522, and the guide surface 522 is used to convert the circumferential rotation of the lock ring 52 into the movement of the limit column 53 toward the limit ring 51, so that the limit column 53 is in contact with the limit ring 51 and the lock ring 52. According to this design, when the second shaft body 32 drives the lock ring 52 to rotate in the first direction, the limit ring 51 is in contact with the guide surface 522. Under the action of the guide surface 522, the limit column 53 gradually moves toward the limit ring 51 until the limit column 53 is in contact with the guide surface 522 and the limit ring 51 respectively, so that the lock ring 52 is restricted from rotating, and the second shaft body 32 is also restricted from rotating. When the first shaft body 31 drives the second shaft body 32 to rotate in the second direction, the first limit block 511 drives the limit column 53 to move until the limit column 53 is separated from the limit ring 51 and / or the lock ring 52, so as to release the restriction of the lock shaft assembly 5 on the second shaft body 32.

[0054] Reference Figure 1 , Figure 2 As shown, the second shaft body 32 in this embodiment includes a first body 321 inserted in the first shaft body 31, a second body 322 installed in linkage with the planetary gear train 4, and a third body 323 inserted in the output shaft 2, and the lock ring 52 is sleeved on the first body 321. According to this design, the two ends of the second shaft body 32 can be connected to the first shaft body 31 and the output shaft 2 respectively.

[0055] In order to connect the impact assembly 1 and the second shaft body 32, refer to Figure 1 , Figure 2As shown, in this embodiment, the first shaft body 31 is provided with a second mounting hole 311 and a third mounting hole 312, and the impact assembly 1 is inserted into the second mounting hole 311, that is, the impact rod 11 is inserted into the second mounting hole 311. The second shaft body 32 is inserted into the third mounting hole 312, the first abutting surface 310 is provided in the third mounting hole 312, and the second abutting surface 320 is provided on the first body 321.

[0056] In order to transmit the rotation of the transmission shaft 3 to the output shaft 2, refer to Figure 1 As shown, the planetary gear train 4 in this embodiment includes an inner ring gear 41 , a sun gear 42 disposed on the second body 322 , and planetary gears 43 disposed between the inner ring gear 41 and the sun gear 42 , and the planetary gears 43 are mounted on the output shaft 2 .

[0057] Further, in order to better transmit the rotation of the transmission shaft 3 to the output shaft 2, refer to Figure 2 As shown, the sun gear 42 in this embodiment is integrally arranged with the second body 322. According to this design, the sun gear 42 can rotate in coordination with the second shaft body 32, so as to better transmit the rotation of the second shaft body 32 to the planetary gear train 4. Of course, the present application is not limited to this, and the sun gear 42 and the second body 322 in this embodiment can also be separately arranged.

[0058] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0059] The utility model provides an impact tool, which can reduce the rebound amount of the transmission shaft through the arrangement of a shaft locking component, ensure the striking effect, and reduce the loss of the output torque of the output shaft.

[0060] 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 regarded as 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 regarded as limiting the claim to which it relates.

[0061] 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 description 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 embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An impact tool, characterized in that: The impact tool comprises: Impact components; An output shaft, coaxially arranged with the impact assembly; A transmission shaft, the transmission shaft comprising a first shaft body connected to the impact assembly and a second shaft body connected to the output shaft, the second shaft body being inserted into the first shaft body, the first shaft body being provided with a first abutting surface, and the second shaft body being provided with a second abutting surface; A planetary gear train, sleeved on the outside of the transmission shaft and installed in linkage with the transmission shaft and the output shaft; A shaft lock assembly is disposed in the planetary gear train and sleeved on the outside of the transmission shaft; In the first state, the first abutting surface and the second abutting surface abut against each other, and the second shaft body and the shaft locking assembly are unlocked; In the second state, the first abutting surface and the second abutting surface are separated, and the second shaft body is locked with the shaft locking assembly.

2. The impact tool according to claim 1, characterized in that The first shaft body is provided with a first limit block, and the shaft locking assembly comprises: A limiting ring, sleeved on the outside of the first shaft and partially located outside the second shaft; A locking ring is sleeved on the outside of the second shaft body and located inside the limiting ring. The first shaft body, the locking ring and the limiting ring together form a receiving cavity. The locking ring is provided with a second limiting block along the circumferential direction. The first limiting block and the second limiting block are both arranged along the axial direction. A limiting column, movably installed in the receiving cavity and arranged between the first limiting block and the second limiting block; In the first state, the limiting post is separated from the limiting ring and / or the locking ring; In the second state, the limiting post is in contact with the limiting ring and the locking ring.

3. The impact tool according to claim 2, characterized in that A guide surface is provided on the side wall of the locking ring, and the guide surface is used to convert the circumferential rotation of the locking ring into the movement of the limiting post toward the limiting ring, so that the limiting post abuts against the limiting ring and the locking ring.

4. The impact tool according to claim 2, characterized in that The second shaft body includes a first main body inserted in the first shaft body, a second main body installed in linkage with the planetary gear train, and a third main body inserted in the output shaft, and the locking ring is sleeved on the first main body.

5. The impact tool according to claim 4, characterized in that The cross section of the first body is non-circular, the locking ring is provided with a first mounting hole matched with the first body, and the inner wall of the first mounting hole is aligned with the outer wall of the first body.

6. The impact tool according to claim 4, characterized in that The planetary gear train includes an inner gear ring, a sun gear arranged on the second body, and planetary gears arranged between the inner gear ring and the sun gear, and the planetary gears are installed on the output shaft.

7. The impact tool according to claim 6, characterized in that The sun gear and the second body are arranged separately or integrally.

8. The impact tool according to claim 4, characterized in that A second mounting hole and a third mounting hole are provided on the first shaft body, the impact assembly is inserted in the second mounting hole, the second shaft body is inserted in the third mounting hole, the first abutting surface is arranged in the third mounting hole, and the second abutting surface is arranged on the first main body.

9. The impact tool according to claim 2, characterized in that: The limiting ring includes a first ring body sleeved on the first shaft body, a second ring body located outside the second shaft body, and an extension portion extending toward the second shaft body. The first shaft body, the second ring body, the extension portion, and the locking ring enclose a receiving cavity.

10. The impact tool according to claim 1, characterized in that The impact assembly comprises an impact rod and a striking block sleeved on the outside of the impact rod, the striking block is provided with a receiving groove, the impact rod is inserted in the first shaft body, and the first shaft body is partially received in the receiving groove.

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