Sleeve for fastening workpieces

Abstract

A sleeve for fastening a workpiece, the sleeve comprising a body extending along a working axis, the body comprising a working end having a workpiece bore adapted to receive a workpiece head and an opposite drive end having a shaft retaining bore adapted to receive an output shaft of an impact tool, a damping part which can elastically deform along the working axis in the axial direction is arranged in the workpiece hole, and the axial distance from the front end surface, close to the workpiece head, of the damping part to the front end edge of the working end is smaller than the axial length of the workpiece head. In this manner, when the impact tool performs a fastening application operation, the damping member may buffer hard contact between the working end of the sleeve and the application substrate to suppress vibration of the sleeve caused thereby.

Description

Technical Field

[0001] This invention relates to an accessory for an impact tool, and more particularly to a sleeve that transmits the output torque of the impact tool to a workpiece to secure the workpiece. Background Technology

[0002] A sleeve typically takes the form of engaging a workpiece and then applying torque to it (e.g., a bolt, nut, screw, or other fastener). A sleeve is typically an elongated cylindrical member that engages the workpiece head at a working end and connects to an impact tool with an output shaft at a drive end opposite the working end. The torque applied by the impact tool is transmitted to the workpiece through the sleeve, allowing the workpiece to be inserted into or removed from the application substrate.

[0003] The tangential impact mechanism of the impact tool, along with the transmission gears and electric motor, generates vibrational excitation during operation. Most of the excitation occurs on the rotating shaft of the tangential impact mechanism, and the excitation force is transmitted to a sleeve connected to the output shaft of the impact tool. (Reference) Figure 1 The drive end of the sleeve adjacent to the output shaft is in undamped hard contact with the front end of the impact tool, and the working end of the sleeve is in unbuffered hard contact with the application substrate (typically a rigid body, i.e., steel) on which the operation is performed. Therefore, the excitation transmitted to the sleeve is reflected back to the impact tool and the user, resulting in a high arm vibration (HAV) value. Summary of the Invention

[0004] The purpose of this invention is to provide a sleeve for fastening workpieces that can buffer undamped hard contact between the sleeve, the impact tool, and the application substrate to suppress the reaction force of sleeve vibration on the impact tool and the user, making the impact tool less prone to damage and meeting the user's HAV value requirements.

[0005] According to an embodiment of the present invention, a sleeve for fastening a workpiece is provided. The sleeve includes a body extending along a working axis, the body including a working end and an opposite driving end. The working end has a workpiece bore adapted to receive a workpiece head, and the driving end has a shaft retaining bore adapted to receive an output shaft of an impact tool. A damping member, elastically deformable axially along the working axis, is provided in the workpiece bore, wherein the axial distance from the front end surface of the damping member adjacent to the workpiece head to the front edge of the working end is less than the axial length of the workpiece head. In this way, when the impact tool performs a tensioning operation, the damping member can buffer the hard contact between the working end of the sleeve and the application substrate to suppress vibration of the sleeve caused by the hard contact.

[0006] The damping component includes a first elastic element, which is fixed to the workpiece hole by means of radial extension and / or axial adhesion. Here, the first elastic element is directly and fixedly mounted in the workpiece hole, and the hard contact between the sleeve and the application substrate is buffered by means of the axial elastic deformation of the first elastic element.

[0007] Optionally, the damping component further includes a clamping ring and a protective cap, wherein the clamping ring is axially fixed in the workpiece hole along its outer peripheral edge, the first elastic element is configured as a cylindrical shape with a central hole, and the protective cap includes an end cap and a shaft portion. The end cap at least partially covers the radial cross-sectional profile of the workpiece head, and the shaft portion extends axially through the central hole of the first elastic element, with one end of the shaft portion opposite to the end cap axially flexibly connected to the clamping ring. Therefore, the elastic element is indirectly fixed axially in the workpiece hole by means of the clamping ring and the protective cap, resulting in an extended service life for the damping component, which can be a component independent of the sleeve.

[0008] According to a preferred embodiment of the invention, the clamping ring is radially elastically deformable, and the profile of the outer peripheral edge of the clamping ring is slightly larger than the inner circumference of the workpiece hole, such that the clamping ring is radially elastically clamped in the workpiece hole. In this way, a fixed connection between the damping component and the workpiece hole is achieved by means of the radial elastic deformation of the clamping ring, making the damping component replaceable.

[0009] Alternatively, the clamping ring is rigid and press-fitted into the workpiece bore. Here, the damping component is pre-installed in the workpiece bore and forms an integral part with the sleeve, thereby avoiding the risk of the damping component disengaging from the sleeve.

[0010] According to another preferred embodiment of the invention, the damping member further includes a spacer disposed between the clamping ring and the bottom surface of the workpiece hole, and configured to define the axial position of the damping member in the workpiece hole. The spacer abuts against the clamping ring on the side of the clamping ring facing the bottom surface of the workpiece hole to define the axial position of the clamping ring in the workpiece hole. In this way, a suitable damping member can be selected according to different applications and workpieces.

[0011] According to another preferred embodiment of the invention, the clamping ring further includes an axially extending spacer portion, and one end of the spacer portion opposite to the clamping ring abuts against the bottom surface of the workpiece hole. Here, the clamping ring itself includes the spacer portion, which defines the axial position of the damping member in the workpiece hole, so that the damping member can be easily and conveniently positioned and installed in the workpiece hole.

[0012] According to another embodiment of the invention, a sleeve for fastening a workpiece is provided. The sleeve includes a body extending along a working axis, the body having a working end and an opposite driving end. The working end has a workpiece hole adapted to receive a workpiece head, and the driving end has a shaft retaining hole adapted to receive an output shaft of an impact tool. A second elastic element is axially fixedly disposed in the shaft retaining hole, and the second elastic element abuts against the front end of the output shaft. In this way, during operation of the impact tool, the second elastic element can buffer the hard contact between the front end of the impact tool and the sleeve to reduce axial vibration transmitted from the sleeve to the impact tool.

[0013] The second elastic element is secured to the axial recess of the shaft retaining hole by means of radial support and / or adhesive and / or elastic element. The second elastic element is axially secured to the shaft retaining hole such that the hard contact between the sleeve and the impact tool is cushioned by means of the axial deformation of the second elastic element.

[0014] According to another embodiment of the present invention, a sleeve for fastening a workpiece is provided. The sleeve includes a body extending along a working axis, the body having a working end and an opposite driving end. The working end has a workpiece bore adapted to receive a workpiece head, and the driving end has a shaft retaining bore adapted to receive an output shaft of an impact tool. A damping member elastically deformable along the working axis is provided in the workpiece bore, wherein the axial distance from the front end surface of the damping member adjacent to the workpiece head to the front edge of the working end is less than the axial length of the workpiece head. A second elastic element is axially fixed in the shaft retaining bore and abuts against the front end of the output shaft. In this embodiment, the sleeve has elastic damping members on both the working end and the driving end to buffer hard contact between the working end of the sleeve and the application substrate, and hard contact between the driving end of the sleeve and the impact tool, respectively, thereby minimizing vibrations transmitted from the sleeve to the impact tool.

[0015] The first elastic element and / or the second elastic element are formed of an elastic material (e.g., plastic, rubber, foam, or elastomer), an elastic geometry (e.g., a coil spring, disc spring, or honeycomb structure), an elastic component (e.g., a hydraulic device or air spring), or a combination thereof. Therefore, the stiffness of the first elastic element and / or the second elastic element can be adjusted by means of material selection and / or geometry. Attached Figure Description

[0016] The above embodiments can be better understood through the following detailed description with reference to the accompanying drawings. It should be emphasized that the various components are not necessarily drawn to scale. In fact, dimensions can be increased or decreased arbitrarily for clarity. In the drawings, the same reference numerals refer to the same elements.

[0017] Figure 1 This is a schematic diagram of a sleeve in operation in the prior art;

[0018] Figure 2 This is a schematic cross-sectional view of a sleeve for fastening a workpiece according to a first embodiment of the present invention;

[0019] Figure 3 yes Figure 2 A schematic cross-sectional view of a variant of the sleeve shown;

[0020] Figure 4 yes Figure 3 A schematic exploded view of a variant of the sleeve shown;

[0021] Figure 5 yes Figure 2 A schematic exploded view of another variant of the sleeve shown;

[0022] Figure 6 yes Figure 2 A schematic cross-sectional view of another variant of the sleeve shown;

[0023] Figure 7 This is a schematic cross-sectional view of the sleeve according to a second embodiment of the present invention;

[0024] Figure 8 It is based on Figure 7 A schematic cross-sectional view showing enlarged details of the sleeve in the illustrated embodiment; and

[0025] Figure 9 This is a schematic cross-sectional view of the sleeve according to a third embodiment of the present invention. Detailed Implementation

[0026] The following will refer to Figures 2 to 9 A sleeve for use in the impact tool of the present invention is described. The following description is merely exemplary and does not limit the disclosure of this application or the application or use of the invention. In the description of the invention, it should be understood that the orientations or positional relationships indicated by terms such as “center,” “longitudinal,” “transverse,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings. These orientations or positional relationships are used only to facilitate and simplify the description of the invention and are not intended to indicate or imply that the mentioned devices or elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

[0027] refer to Figures 2 to 9The sleeve 1 includes a body 8 extending along a working axis, and the body 8 is generally in the shape of a hollow elongated cylinder. The body 8 includes a working end 3 and an opposite driving end 4. The driving end 4 is adapted to be releasably coupled to a torque-applying tool, such as an electric drill, ratchet, torque or impact wrench, screwdriver, or grooving machine. In an embodiment of the invention, the torque-applying tool is an impact tool. The output shaft 9 of the impact tool extends from the front of the impact tool housing and generally has a square cross-sectional profile. The driving end 4 has a shaft retaining hole 6 adapted to engage the output shaft 9 of the impact tool, such as a square drill hole, which is adapted to be releasably coupled to the front end of the output shaft 9 of the impact tool. The shaft retaining hole 6 may further include an engagement portion disposed on its inner surface, and the engagement portion is adapted to engage in a retaining manner with an outwardly offset retaining ring or retaining ball disposed on the output shaft 9 of the tool.

[0028] The working end 3 has a workpiece hole 5 extending axially from the front end edge 31 along the working axis 10, and the workpiece hole 5 is adapted to receive a workpiece head 7 for fastening a workpiece to transmit torque from a torque applying tool to the workpiece. The workpiece hole 5 may have different radial cross-sectional profiles and / or dimensions; for example, the workpiece hole 5 may have a radial profile and dimensions near the front end edge 31 that depend on the profile and dimensions of the workpiece head 7 to which the workpiece hole is adapted, and may have a smaller inner diameter profile or dimension near the shaft retaining hole 6. Although the workpiece hole 5 and the shaft retaining hole 6 of the sleeve 1 have different shapes and dimensions, the workpiece hole 5 is generally in communication with (preferably coaxial with) the shaft retaining hole 6, and therefore the portion of the workpiece hole 5 that connects to the shaft retaining hole 6 includes a transition portion in which the bottom surface 50 of the workpiece hole 5 tapers toward the shaft retaining hole 6.

[0029] The sleeve 1 of this invention is applicable to threaded fasteners with a workpiece head 7, such as bolts with heads or threaded studs and nuts. Threaded fasteners are the most commonly used standard components in various mechanical equipment and should be selected according to the application and function of the fastener. The sleeve for threaded fasteners is also a standard component. The specifications and dimensions of the sleeve depend on the specifications and dimensions of the fastener it fits. For example, the profile of the workpiece hole at the working end of the sleeve is approximately the same as the profile of the workpiece head (most commonly hexagonal). In addition to commonly used standard sleeves, there are many special sleeves, such as hexagonal long sleeves, hexagonal or dodecagonal spline sleeves, and screwdriver sleeves. If the head is made of a bolt or nut with a special shape, a special sleeve must be used for installation or removal. The radial dimension of the workpiece hole is approximately equal to or slightly larger than the radial dimension of the workpiece head it fits. The axial length of the workpiece hole generally depends on the length of the shank of the bolt or stud protruding from the substrate. That is, the axial length of the workpiece hole is at least longer than the longest distance the shank of the bolt or stud can extend into the sleeve.

[0030] According to a first embodiment of the present invention, reference is made to Figure 2 A buffer mechanism 2, elastically deformable along the working axis 10, is provided in the workpiece hole 5. The buffer mechanism 2 includes a first elastic element 20. The first elastic element 20 may be formed of an elastic material (such as plastic, rubber, foam (e.g., polyurethane) or elastomer (e.g., NBR, HNBR, EPDM, or AEM)), or an elastic geometry (e.g., a coil spring, disc spring, or honeycomb structure), or an elastic component (e.g., a hydraulic device or air spring), or a combination thereof. Figure 2 In the embodiment shown, the first elastic element 20 is an elastic body formed of elastic material and is in the shape of a hollow cylinder extending axially along the working axis 10, and the outer peripheral surface of the first elastic element has a profile that is substantially the same as that of the workpiece hole 5, such as a hexagonal shape.

[0031] The first elastic element 20 is fixed to the workpiece hole 5 by means of an axial fixed connection (e.g., axial bonding). Alternatively, the first elastic element 20 is fixed to the workpiece hole 5 by means of radial extension. For example, the outer diameter of the first elastic element 20 is larger than the inner diameter of the workpiece hole. During the installation of the elastic element, the first elastic element 20 is compressed radially and then placed in the workpiece hole 5. Since the first elastic element 20 is an elastic body formed of elastic material, the first elastic element 20 naturally and elastically extends radially after the radial pressure is released and then abuts against the inner wall of the workpiece hole 5.

[0032] Optionally, a positioning mechanism may be provided on the inner wall of the workpiece hole 5, so that the first elastic element 20 can be axially fixed in the workpiece hole 5 without the risk of axial displacement or disengagement. For example, the workpiece hole 5 has a positioning surface 51 that extends at least partially radially inward and substantially perpendicular to the working axis. The positioning surface 51 is not completely closed, but is an annular surface that slightly protrudes from the inner wall of the workpiece hole 5. The rear end of the first elastic element 20 abuts against the positioning surface 51, so that the bottom surface can define the axial position of the elastic element 20 in the workpiece hole.

[0033] The axial distance from the front surface 21 of the workpiece head 7 adjacent to the first elastic element 20 to the front edge 31 of the working end 3 should be less than the axial length of the workpiece head 7. For example... Figure 2As shown, in this manner, when the fastening operation begins, the workpiece head 7 is received in the workpiece hole 5, with the front edge 31 of the first elastic element 20 adjacent to the end surface of the workpiece head 7. Since the axial distance from the front surface 21 of the first elastic element 20 to the front edge 31 of the working end 3 should be less than the axial length of the workpiece head 7, the workpiece head 7 is not completely contained within the workpiece hole 5. That is, the front edge 31 of the working end does not contact the surface of the substrate but is slightly separated from it. During the fastening operation, as the workpiece head 7 gradually approaches the substrate until it can no longer approach, the first elastic element 20 begins to elastically deform in the axial direction. This avoids hard contact between the front edge 31 of the sleeve and the surface of the substrate, reducing vibration caused by the reaction force transmitted from the fastened workpiece to the sleeve.

[0034] Figure 3 and Figure 6 It shows Figure 2 The sleeve shown is a variant embodiment. With Figure 2 Unlike the embodiment shown, the buffer mechanism 2 includes not only the first elastic element 20, but also a clamping ring 23 and a protective cover 22. Here, the first elastic element 20 is indirectly fixed axially to the workpiece hole 5 by means of the clamping ring 23 and the protective cover 22, thereby extending the service life of the damping component 2, and the damping component 2 can be a part independent of the sleeve 1.

[0035] The first elastic element 20 can still be formed of an elastic material (e.g., plastic, rubber, foam, or elastomer), or an elastic geometry (e.g., a coil spring, disc spring, or honeycomb structure), or an elastic component (e.g., a hydraulic device or air spring), or a combination thereof. The shape and material of the first elastic element 20 can be selected or combined according to the differences in the elasticity and stiffness required by the damping components of different sleeves. Figures 3 to 5 In the illustrated embodiment, the first elastic element 20 can be an elastic body formed of an elastic material, shaped like a cylinder having a central hole 25 and extending axially along the working axis 10, and the outer peripheral surface of the first elastic element has a profile substantially the same as that of the workpiece hole 5, for example, a hexagonal shape. Figure 6 In the embodiment shown, the first elastic element 20 is a helical spring, and the spring wire is helically wound in the circumferential direction along the working axis to form a cylinder with a central hole 25.

[0036] Specifically, the protective cover 22 includes an end cap 220 and a shaft portion 221. The end cap at least partially covers the radial cross-sectional profile of the workpiece head 7. The shaft portion extends axially through the central hole 25 of the first elastic element 20, and one end of the shaft portion opposite to the end cap is flexibly connected axially to the clamping ring 23. Therefore, the side of the end cap 220 of the protective cover 22 facing the workpiece head serves as the front end surface 21 of the buffer mechanism 2 adjacent to the workpiece head, and at least partially covers the radial cross-sectional profile of the workpiece head 7. The axial distance from the front end surface 21 to the front edge 31 of the working end 3 is less than the axial length of the workpiece head 7. The other side of the end cap 220 is configured to support the first elastic element 20 to protect it, thereby reducing wear or damage to the first elastic element 20.

[0037] The clamping ring 23 is axially fixed in the workpiece hole 5 along its outer peripheral edge. For example... Figure 3 and Figure 4 As shown, the clamping ring 23 is formed of POM plastic and is slightly deformable in the radial direction. The outer peripheral edge of the clamping ring 23 has a profile dimension slightly larger than the inner circumference of the workpiece hole 5, and the clamping ring 23 is elastically clamped in the workpiece hole in the radial direction. In this way, the fixed connection between the damping component and the workpiece hole is achieved by means of the radial elastic deformation of the clamping ring, making the damping component replaceable. Optionally, the outer peripheral edge of the clamping ring 23 is provided with a number of positioning structures (e.g., protrusions), and correspondingly, the inner peripheral surface of the workpiece hole 5 is provided with a number of corresponding recesses. The protrusions of the clamping ring can engage in the recesses of the workpiece hole, so that the clamping ring 23 is more stably positioned in the workpiece hole 5 in the axial direction.

[0038] Alternatively, such as Figure 5 As shown, the clamping ring 23 is rigid, for example, made of metal. The rigid clamping ring 23 is press-fitted into the workpiece hole 5. Here, the damping member 2 is pre-installed in the workpiece hole and forms an integral part with the sleeve 1, thereby avoiding the risk of the damping member 2 disengaging from the sleeve. It is understood that the rigid clamping ring 23 may also include an axial positioning structure to achieve a better axial fixation positioning effect, which will not be described further herein.

[0039] The damping component 2 includes a first elastic element 20, a protective cap 22, and a clamping ring 23. Vibrations caused by hard contact between the front edge 31 and the surface of the substrate are buffered by the damping component 2 through the axial elastic deformation of the first elastic element 20. The first elastic element 20 has a front end abutting the end cap 220 and a rear end abutting the clamping ring 23, and the clamping ring 23 is axially fixed in the workpiece hole 5. The end of the shaft portion 221 of the protective cap 22, away from the end cap, is axially flexibly connected to the clamping ring 23. When the front surface 21 of the protective cap 22 is under pressure, the first elastic element 20 can elastically deform, thereby achieving the buffering function. Preferably, the end of the shaft portion 221 of the protective cap 22, away from the end cap, is connected to the clamping ring 23 by means of an annular snap-fit ​​fastener.

[0040] refer to Figures 3 to 5 Preferably, the damping component 2 further includes a spacer 26 disposed between the clamping ring 23 and the bottom surface 50 of the workpiece hole 5, and configured to adjust the initial axial position of the damping component 2 in the workpiece hole 5. As shown, the spacer 26 may be cylindrical in shape, extending axially along the working axis, and its front end abuts against the clamping ring on the side of the clamping ring 23 facing the bottom surface 50 of the workpiece hole to define the axial position of the clamping ring in the workpiece hole. Preferably, the spacer 26 is in the shape of a hollow ring, and the axial length of the spacer 26 can be selected according to different sleeves and the axial length of the damping component 2. This allows for the selection of a suitable sleeve based on different applications and workpieces, without affecting the performance of the sleeve due to the addition of the damping component.

[0041] Further reference Figure 6 In this embodiment, the clamping ring 23 further includes an axially extending spacer portion 24, with one end of the spacer portion 24 facing away from the clamping ring abutting the bottom surface 50 of the workpiece hole. Here, a separate spacer 26 is not required; instead, the spacer portion 24 is integrated into the clamping ring 23, and the clamping ring 23 includes the spacer portion configured to define the axial position of the damping member in the workpiece hole. In this way, the clamping ring 23 does not require an additional axial positioning structure, making it simple and convenient to position and install the damping member 2 in the workpiece hole 5.

[0042] Next, refer to Figure 7 and Figure 8 According to a second embodiment of the present invention, the second elastic element 40 is axially fixed in the shaft retaining hole 6, and the second elastic element 40 abuts against the front end of the output shaft 9. As described in the background art, during the tightening operation, the vibration of the sleeve 1 mainly comes from the undamped hard contact between the drive end of the sleeve and the front end of the impact tool, and the working end of the sleeve is in unbuffered hard contact with the application substrate (typically a rigid body, i.e., steel) on which the operation is performed. Figures 2 to 6 In the aforementioned embodiments shown, the primary objective is to achieve hard contact between the working end of the buffer sleeve and the surface of the application substrate. Figure 7 and Figure 8 In the illustrated embodiment, the sleeve is primarily used to cushion the hard contact between the tip of the impact tool and the sleeve during operation of the impact tool, thereby reducing axial vibration transmitted from the sleeve to the impact tool.

[0043] Similarly, the stiffness of the second elastic element 40 can be adjusted by means of material selection and / or geometry. For example, the second elastic element 40 may be formed of an elastic material (e.g., plastic, rubber, foam, or elastomer), or an elastic geometry (e.g., a coil spring, disc spring, or honeycomb structure), or an elastic component (e.g., a hydraulic device or air spring), or a combination thereof. Figure 7 and Figure 8 As shown, as an example, the second elastic element 40 is an elastic plug formed of an elastic material.

[0044] The second elastic element 40 is axially fixed to the shaft retaining hole 6. (Reference) Figure 8 The second elastic element 40 includes an end surface 41 and an axially extending shaft portion 42. The end surface abuts against the front end of the output shaft 9. The shaft portion has one end adjacent to the end surface 41 and the opposite end provided with a hook 43. The shaft portion has a profile slightly smaller than the end surface. A radially inwardly extending protrusion 60 is provided in the shaft retaining hole 6. When the second elastic element 40 is installed into the shaft retaining hole 6, the end surface 41 and the hook 43 abut against the front and rear ends of the protrusion 60, respectively, so that the second elastic element 40 is axially fixedly installed into the shaft retaining hole 6. It is understood that the manner in which the second elastic element 40 is axially fixed into the shaft retaining hole 6 is not limited to this. For example, the second elastic element 40 may be installed into the shaft retaining hole 6 by means of radial support and / or adhesion and / or press fit.

[0045] It should be noted that for sleeves adapted to different impact tools, the profile and dimensions of the shaft retaining hole are determined according to the output shaft of the impact tool to which the shaft retaining hole is adapted, wherein the distance by which the output shaft extends into the shaft retaining hole is also specific. Therefore, the axial length of the second elastic element 40 is selected according to the output shaft to which the sleeve is adapted, such that after the sleeve is attached to the output shaft, the second elastic element 40 abuts against the front end of the output shaft 9, allowing the second elastic element 40 to elastically deform to absorb the vibration caused by axial movement between the sleeve and the output shaft.

[0046] Figure 9A sleeve for fastening a workpiece according to a third embodiment of the invention is shown, wherein elastic damping components are respectively disposed on the drive end and the working end to buffer the hard contact between the working end of the sleeve and the application substrate and the hard contact between the drive end of the sleeve and the impact tool, thereby minimizing the vibration transmitted from the sleeve to the impact tool. Figure 9 As shown, the sleeve 1 includes: a body 8 extending along the working axis 10, the body 8 having a working end 3 and an opposite driving end 4, the working end 3 having a workpiece hole 5 adapted to receive a workpiece head 7, the driving end 4 having a shaft retaining hole 6 adapted to engage the output shaft 9 of the impact tool; and a damping member 2 disposed in the workpiece hole 5, the damping member being elastically deformable axially along the working axis 10, wherein the axial distance from the front end surface 21 of the damping member 2 adjacent to the workpiece head to the front end edge 31 of the working end 3 is less than the axial length of the workpiece head 7, and a second elastic element 40 is axially disposed at the end of the shaft retaining hole 6 opposite to the output shaft, and the second elastic element 40 is adjacent to the front end of the output shaft 9.

[0047] It should be understood that the quantity, structure and other technical features of the damping components and / or elastic elements disclosed in the first embodiment and its variants disclosed above, as well as in the second embodiment, can be combined and configured according to the requirements of different sleeves and applied to the embodiment to achieve the corresponding effects. These effects will not be described further in this document.

[0048] Those skilled in the art who benefit from the teachings set forth in the foregoing description and associated drawings will readily conceive of many variations and other embodiments of the invention described herein. Therefore, it should be understood that the invention is not limited to the specific embodiments disclosed, and that modifications and other embodiments are intended to be included within the scope of the appended claims. Furthermore, while the foregoing description and associated drawings describe exemplary embodiments of certain exemplary combinations of elements and / or functions, it should be understood that different combinations of elements and / or functions may be provided by alternative embodiments without departing from the scope of the appended claims.

Claims

1. A sleeve (1) for fastening a workpiece, the sleeve comprising a body (8) extending along a working axis (10), the body (8) having a working end (3) and an opposite driving end (4), the working end (3) having a workpiece hole (5) adapted to receive a workpiece head (7), and the driving end (4) having a shaft retaining hole (6) adapted to receive an output shaft (9) of an impact tool, characterized in that, The workpiece hole (5) is provided with a damping member (2) that can elastically deform along the working axis (10) in the axial direction, and the axial distance from the front end surface (21) of the damping member (2) adjacent to the workpiece head (7) to the front end edge (31) of the working end (3) is less than the axial length of the workpiece head (7).

2. The sleeve (1) according to claim 1, characterized in that, The damping component (2) includes a first elastic element (20) which is fixed to the workpiece hole (5) by means of radial extension and / or axial adhesion.

3. The sleeve (1) according to claim 1, characterized in that, The damping component (2) further includes a clamping ring (23) and a protective cover (22), wherein the clamping ring (23) is axially fixed in the workpiece hole (5) along the outer peripheral edge of the clamping ring, the first elastic element (20) is configured in a cylindrical shape having a central hole (25), the protective cover (22) includes an end cap (220) and a shaft portion (221), the end cap at least partially covering the radial cross-sectional profile of the workpiece head (7), the shaft portion extending axially through the central hole (25) of the first elastic element, and one end of the shaft portion (221) opposite to the end cap being axially flexibly connected to the clamping ring (23).

4. The sleeve (1) according to claim 3, characterized in that, The clamping ring (23) is radially elastically deformable, and the profile of the outer peripheral edge of the clamping ring (23) is slightly larger than the inner peripheral surface of the workpiece hole (5), so that the clamping ring is radially elastically clamped in the workpiece hole (5).

5. The sleeve (1) according to claim 3, characterized in that, The clamping ring (23) is rigid and is press-fitted into the workpiece hole (5).

6. The sleeve (1) according to claim 3, 4 or 5, characterized in that, The damping member (2) further includes a spacer (26) disposed between the clamping ring (23) and the bottom surface (50) of the workpiece hole (5), and configured to define the axial position of the damping member in the workpiece hole (5).

7. The sleeve (1) according to claim 3, 4 or 5, characterized in that, The clamping ring (23) further includes an axially extending spacer portion (24), and one end of the spacer portion (24) opposite to the clamping ring (23) abuts against the bottom surface (50) of the workpiece hole (5).

8. The sleeve (1) according to any one of claims 2 to 7, characterized in that, The first elastic element (20) is formed of plastic, rubber, foam, elastomer or other elastic material, or a helical spring, disc spring, honeycomb structure or other elastic geometry, or a hydraulic device, air spring or other elastic component, or a combination thereof.

9. A sleeve (1) for fastening a workpiece, the sleeve comprising a body (8) extending along a working axis (10), the body (8) having a working end (3) and an opposite driving end (4), the working end (3) having a workpiece hole (5) adapted to receive a workpiece head (7), and the driving end (4) having a shaft retaining hole (6) adapted to receive an output shaft (9) of an impact tool, characterized in that, The second elastic element (40) is fixedly disposed in the shaft retaining hole (6) in the axial direction, and the second elastic element (40) abuts against the front end of the output shaft (9).

10. The sleeve (1) according to claim 9, characterized in that, The second elastic element (40) is formed of plastic, rubber, foam, elastomer or other elastic material, or a helical spring, disc spring, honeycomb structure or other elastic geometry, or a hydraulic device, air spring or other elastic component, or a combination thereof.

11. The sleeve (1) according to claim 10, characterized in that, The second elastic element (40) is fixed to the axial recess of the shaft retaining hole (6) by means of radial support and / or adhesive and / or elastic element.

12. A sleeve (1) for fastening a workpiece, the sleeve comprising a body (8) extending along a working axis (10), the body (8) having a working end (3) and an opposite driving end (4), the working end (3) having a workpiece hole (5) adapted to receive a workpiece head (7), and the driving end (4) having a shaft retaining hole (6) adapted to receive an output shaft (9) of an impact tool, characterized in that, The workpiece hole (5) is provided with a damping member (2) that can elastically deform along the working axis (10) in the axial direction. The axial distance from the front end surface (21) of the damping member (2) adjacent to the workpiece head (7) to the front end edge (31) of the working end (3) is less than the axial length of the workpiece head (7). The second elastic element (40) is fixedly disposed in the shaft holding hole (6) in the axial direction, and the second elastic element (40) abuts against the front end of the output shaft (9).

13. The sleeve (1) according to claim 12, characterized in that, The damping component includes a first elastic element (20), wherein the first elastic element (20) is fixed to the workpiece hole (5) by means of radial extension and / or axial adhesion, and the second elastic element (40) is fixed to the axial recess of the shaft holding hole (6) by means of radial support and / or adhesion and / or elastic element.

14. The sleeve (1) according to claim 12, characterized in that, The damping component (2) further includes a clamping ring (23) and a protective cover (22), wherein the clamping ring (23) is axially fixed in the workpiece hole (5) along the outer peripheral edge of the clamping ring, the first elastic element (20) is configured in a cylindrical shape having a central hole (25), the protective cover (22) includes an end cap (220) and a shaft portion (221), the end cap at least partially covering the radial cross-sectional profile of the workpiece head (7), the shaft portion extending axially through the central hole (25) of the first elastic element, and one end of the shaft portion (221) opposite to the end cap being axially flexibly connected to the clamping ring (23), and the second elastic element (40) is fixed to the axial recess of the shaft retaining hole (6) by means of radial support and / or adhesion and / or elastic element.

15. The sleeve (1) according to claim 13 or 14, characterized in that, The first elastic element (20) and the second elastic element (40) are each formed of plastic, rubber, foam, elastomer or other elastic material, or a helical spring, disc spring, honeycomb structure or other elastic geometry, or a hydraulic device, air spring or other elastic component, or a combination thereof.

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