CN215240534U - Anvil and rotary tool having surface-to-surface contact with sleeve - Google Patents

Anvil and rotary tool having surface-to-surface contact with sleeve Download PDF

Info

Publication number
CN215240534U
CN215240534U CN202121686205.1U CN202121686205U CN215240534U CN 215240534 U CN215240534 U CN 215240534U CN 202121686205 U CN202121686205 U CN 202121686205U CN 215240534 U CN215240534 U CN 215240534U
Authority
CN
China
Prior art keywords
anvil
square
impact
rotary tool
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202121686205.1U
Other languages
Chinese (zh)
Inventor
梁瑞
麻立国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Techtronic Cordless GP
Original Assignee
Techtronic Cordless GP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Techtronic Cordless GP filed Critical Techtronic Cordless GP
Priority to CN202121686205.1U priority Critical patent/CN215240534U/en
Application granted granted Critical
Publication of CN215240534U publication Critical patent/CN215240534U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model relates to an anvil and rotary tool that have face-to-face contact with sleeve. The anvil includes: a main body; and a square portion formed at one end of the anvil, the square portion including four sides, each side including an inclined surface at an outer side thereof. The utility model discloses still relate to the rotation type instrument, the rotation type instrument includes: a drive motor; an anvil driven by the driving motor, the anvil including a body and a square portion formed at one end of the anvil, the square portion including four sides, each side including an inclined surface at an outer side thereof; and an impact socket including a square opening configured to receive a square portion of the anvil.

Description

Anvil and rotary tool having surface-to-surface contact with sleeve
Technical Field
The present invention relates to an anvil for transmitting impact torque to an outer sleeve in a rotary tool and a rotary tool comprising such an anvil.
Specifically, the utility model discloses have the dispersed contact force than traditional anvil, eliminate stress concentration and prolong the anvil life-span, can resist the advantage of higher impact torque.
Background
Conventional designs of anvils used in rotary tools such as impact socket wrenches include a circular portion that transitions into a square portion. The circular portion is received within the impact socket wrench and acts as a bearing journal. The square portion is received within the impingement sleeve.
The square portion of the anvil engages into the impact socket and acts as a torque transfer. Initially, when parts such as the anvil and the impact socket are new, the gap between the square portion and the impact socket is still small, the contact theoretically being a line contact along the axial inner surfaces of the driving face of the anvil and the driven face of the impact socket.
When the anvil is swung through a large angle or after a certain amount of wear between the anvil and the impact socket, point contacts are easily created, which may result in large contact stresses and large wear and even rejection of the driving and driven surfaces. After a long period of use, the impact socket may be "damaged", resulting in a loose fit with the square portion of the anvil, and this point contact may result in increased local stresses on the anvil and the impact socket, and when the stresses build up, the anvil may break at the sharp corners of the square portion. This can lead to premature failure of the anvil.
Fig. 4A is a cross-sectional view of an anvil 2 according to prior art, showing a cross-sectional view of a square shaped portion 20 of the anvil 2 for comparison with an anvil according to the present invention, fig. 4B shows a cross-sectional view of the cooperation of the square shaped portion 20 of the anvil 2 according to prior art with a square shaped opening 61 of the impact sleeve 6, and fig. 4C shows an enlarged view of the encircled portion of fig. 4B.
Fig. 4A shows a cross-sectional view of a conventional anvil 2, and fig. 4A and 4B show the square part 20 of the anvil 2 in contact with the square opening 61 of the impact socket 6, the square part 20 of the anvil 2 comprising four sides 21. As shown, the square portion 20 of the anvil 2 as the driving head is slightly smaller in size than the square opening 61 of the impact socket 6 as the driven body, with a certain clearance between the square portion 20 and the square opening 61. When transmitting torque, the anvil 2 needs to be rotated a certain angle relative to the impact socket 6 in order to contact and transmit the torque. As clearly shown in fig. 4C, the contact area of the square portion 20 with the square opening 61 is mainly concentrated at the sharp corner 22, the contact is in the form of line contact or even point contact, the contact stress is large, and plastic deformation of the contact area and peeling of the heat-treated surface are easily formed. Thereby resulting in failure of the anvil 2 and/or the impact sleeve 6.
One solution to reduce this contact stress is to increase the overall strength of the anvil, for example by heat treating the surface during the manufacturing process to increase the strength of the surface, with higher strength resulting in higher heat treatment costs. For example, the anvil may be subjected to a thermal cryogenic process during manufacture. However, this process step adds to the overall cost of manufacturing the anvil and does not directly address the issues related to stress concentration leading to failure.
Accordingly, there remains a need in the art to provide an improved anvil that eliminates stress concentration zones and extends the useful life of the anvil while reducing its manufacturing related costs.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a modified anvil block, the anvil block sets up in the output of rotation type instrument to be connected with outside square head changes a hexagonal head cover section of thick bamboo, the anvil block has the inclined plane of small angle in the square head outside, when the anvil block driving surface is contacted by the driving surface with the sleeve, the inclined plane carries out the face contact with being driven surface, plays the effect that reduces contact stress.
According to a first aspect of the present invention, there is provided an anvil for a rotary tool, the anvil comprising:
a main body; and
a square portion formed at one end of the anvil, the square portion including four sides, each side including an inclined surface at an outer side thereof.
In a preferred aspect of the first aspect of the present invention, the inclined surface is a completely flat surface or an arc surface having a large radius of curvature.
In a preferred version of the first aspect of the present invention, the inclined surface has an inclination angle which is related to the gap between the anvil and the impact sleeve to which the anvil is mated.
In a preferred aspect of the first aspect of the present invention, the inclined surface is included in both outer sides of each side surface.
In a preferred aspect of the first aspect of the present invention, the inclined surface is completely symmetrical with respect to a symmetry axis of the square portion.
In a preferred version of the first aspect of the present invention, each inclined surface occupies one third of the length of the side surface.
In a preferred version of the first aspect of the present invention, the body is a cylindrical body and includes two locking wings at one end thereof extending radially outwardly from the cylindrical body.
In a preferred version of the first aspect of the present invention, the square portion of the anvil is a square portion subjected to surface heat treatment.
According to a second aspect of the present invention, there is provided a rotary tool, comprising:
a drive motor;
a rotary impact mechanism driven by the drive motor; and
an anvil comprising a main body which is a cylindrical body and includes two locking wings extending radially outward from the cylindrical body at one end thereof, the locking wings being locked within the rotary impact mechanism, and a square portion formed at one end of the anvil, the square portion including four sides, each side including an inclined surface at an outer side thereof.
In a preferred version of the second aspect of the present invention, the rotary tool is an impact wrench.
Drawings
The objects and features of the present invention will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention.
Fig. 1 is a schematic side view of a portion of a rotary tool according to an embodiment of the present invention, showing an anvil according to the present invention;
FIG. 2 is a schematic exploded perspective view of an anvil and an impact sleeve mated therewith according to an embodiment of the present invention;
fig. 3A is a cross-sectional view of an anvil according to an embodiment of the present invention, showing a cross-sectional view of a square portion of the anvil, fig. 3B shows a cross-sectional view of the mating of the square portion of the anvil with the square opening of the impact sleeve according to an embodiment of the present invention, and fig. 3C shows an enlarged view of the circled portion of fig. 3B, showing details of the mating of the square portion of the anvil with the square opening of the impact sleeve according to an embodiment of the present invention; and
fig. 4A is a cross-sectional view of an anvil according to the prior art, showing a cross-sectional view of a square-shaped portion of the anvil for comparison with an anvil according to the present invention, fig. 4B shows a cross-sectional view of the mating of a square-shaped portion of the anvil according to the prior art with a square-shaped opening of the impact sleeve, and fig. 4C shows an enlarged view of the circled portion of fig. 4B.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" or the like is to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. It will be further understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
To facilitate understanding of the technical solutions of the present invention by those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings, wherein the same reference numerals refer to the same or similar elements in the drawings.
Fig. 1 shows a schematic side view of a part of a rotary tool 1 according to an embodiment of the invention, showing an anvil 2 according to the invention. The rotary tool 1 is preferably an impact wrench. The rotary tool 1 comprises an input 5, which input 5 is connected to an output shaft of a drive motor for transmitting a torque of the drive motor. The rotary tool 1 further comprises a reduction gearbox housing 4 and a rotary impact mechanism housing 3. A reduction gearbox is mounted in the reduction gearbox housing 4, which reduces the speed of the input end and increases the rotational torque. A rotary impact mechanism (not shown in the drawings) is installed in the rotary impact mechanism housing 3, and one end of the anvil 2 is connected to the inside of the rotary impact mechanism through a locking wing 24 described later, so that the rotary impact mechanism transmits an impact torque to the anvil 2.
Fig. 2 is a schematic exploded perspective view of an anvil 2 and an impact sleeve 6 mated therewith according to an embodiment of the present invention. The anvil 2 comprises a body 23 and a square portion 20. The body is preferably a cylindrical body. The circular body 23 is substantially cylindrical and comprises at one end thereof two locking wings 24 extending radially outwards from the cylindrical body, said locking wings being adapted to be received and locked inside the rotary impact mechanism. The other end of the anvil 2 has a square portion 20 as a driving head, the square portion 20 being substantially square in cross-section for insertion into a square opening 61 of an impact socket 6 for transmitting the torque of the anvil 2 to the impact socket 6. The impact socket 6 is preferably a square to hexagonal impact socket.
Fig. 3A is a cross-sectional view of an anvil 2 according to an embodiment of the present invention, showing a cross-sectional view of a square portion 20 of the anvil 2. Fig. 3B shows a cross-sectional view of the cooperation of the square portion 20 of the anvil 2 with the square opening 61 of the impact sleeve 6 according to an embodiment of the invention, and fig. 3C shows an enlarged view of the circled part of fig. 3B, wherein the details of the cooperation of the square portion 20 of the anvil 2 with the square opening 61 of the impact sleeve 6 according to an embodiment of the invention are shown.
As shown in fig. 3A, the square portion 20 of the anvil 2 comprises four sides 21. Each side surface comprises an inclined surface 22, said inclined surface 22 being located outside said side surface 21. The inclined surface 22 has an inclination angle a with respect to the symmetry axis Y of the square portion. According to the preferred embodiment of the present invention, the size of the inclination angle α can take various factors into consideration, such as the size of the gap between the square portion 20 and the square opening 61, the size of the ratio of the inclined surface 22 to the side surface 21 in the direction of the symmetry axis Y, and the like. As shown in fig. 3B and 3C, after the anvil 2 is rotated by a certain angle (for example, an inclination angle α) with respect to the impact sleeve 6, the inclined surface 22 comes into contact with the square opening 61 as a driven surface, so that torque can be transmitted from the anvil 2 to the impact sleeve 6 in surface contact. In the improved anvil of the present invention, the contact stress is reduced by the contact method of the surface-to-surface contact of the anvil block 2 and the impact sleeve 6, and the stress concentration is reduced, thereby greatly improving the service life of the anvil block 2 and the impact sleeve 6.
In a preferred embodiment of the invention, said inclined surface 22 may be completely planar, or may be curved with a large radius of curvature, or even have other surface shapes which serve to increase the contact surface between the anvil 2 and the impact sleeve 6. In the preferred embodiment of the present invention, the inclined surfaces 22 are designed on two outer sides of the side surface 21. In a preferred embodiment, the two inclined faces 22 are perfectly symmetrical with respect to the axis of symmetry X of said square portion 20. In the preferred embodiment of the invention, each inclined surface 22 occupies one third of the length of said side 21, in the horizontal symmetry axis Y direction. Due to the inclusion of the inclined surfaces 22 on both outer sides of said side surfaces 21, the anvil 2 and the impact sleeve 6 are brought into surface-to-surface contact both during clockwise rotation (as seen in fig. 3B and 3C) and during counter-clockwise rotation (not shown) of the anvil 2 and the impact sleeve 6. That is, both during clockwise and counterclockwise rotation of the rotary tool (e.g., impact wrench), the anvil 2 and the impact socket 6 can be brought into surface-to-surface contact, better transmitting torque. At the same time, the contact stress of the anvil 2 and the impact socket 6 is reduced, reducing the stress concentration and thus greatly increasing the service life of the anvil 2 and the impact socket 6.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. Accordingly, the above-described embodiments should be regarded as illustrative rather than restrictive.

Claims (10)

1. An anvil for a rotary tool, the anvil comprising:
a main body; and
a square portion formed at one end of the anvil, the square portion including four sides, each side including an inclined surface at an outer side thereof.
2. The anvil of claim 1, wherein said inclined surface is in the shape of a perfect plane or in the shape of an arc having a large bending radius.
3. An anvil according to claim 1 or 2, wherein said inclined surface has an inclination angle which is related to the gap between the anvil and the impact sleeve to which the anvil is mated.
4. An anvil according to claim 1 or 2, wherein said inclined surfaces are included on both outer sides of each side surface.
5. The anvil of claim 4, wherein said inclined surface is fully symmetrical with respect to an axis of symmetry of said square portion.
6. An anvil according to claim 5, wherein each inclined face occupies one third of the length of the side face in a direction perpendicular to the symmetry axis of the square portion.
7. An anvil according to claim 1 or 2, wherein said body is a cylindrical body and comprises at one end thereof two locking wings extending radially outwards from the cylindrical body.
8. An anvil according to claim 1 or 2, wherein the square portion of the anvil is a square portion subjected to a surface heat treatment.
9. A rotary tool, characterized in that the rotary tool comprises:
a drive motor;
a rotary impact mechanism driven by the drive motor; and
an anvil comprising a main body which is a cylindrical body and includes two locking wings extending radially outward from the cylindrical body at one end thereof, the locking wings being locked within the rotary impact mechanism, and a square portion formed at one end of the anvil, the square portion including four sides, each side including an inclined surface at an outer side thereof.
10. The rotary tool of claim 9, wherein the rotary tool is an impact wrench.
CN202121686205.1U 2021-07-23 2021-07-23 Anvil and rotary tool having surface-to-surface contact with sleeve Active CN215240534U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121686205.1U CN215240534U (en) 2021-07-23 2021-07-23 Anvil and rotary tool having surface-to-surface contact with sleeve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121686205.1U CN215240534U (en) 2021-07-23 2021-07-23 Anvil and rotary tool having surface-to-surface contact with sleeve

Publications (1)

Publication Number Publication Date
CN215240534U true CN215240534U (en) 2021-12-21

Family

ID=79494174

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121686205.1U Active CN215240534U (en) 2021-07-23 2021-07-23 Anvil and rotary tool having surface-to-surface contact with sleeve

Country Status (1)

Country Link
CN (1) CN215240534U (en)

Similar Documents

Publication Publication Date Title
JP6170521B2 (en) Fastening system with stable engagement and stick fit
JP4568479B2 (en) Connecting device for connecting each module constituting the tool holding arm
CN110421457B (en) Tool device
US8444322B2 (en) Face spline for a driven wheel hub
US6890139B2 (en) Fastener having recess useable with multiple drivers and method of manufacture
TWI627356B (en) Tapered lobular driver and fastener
EP1512879B1 (en) Fixed type constant velocity universal joint
CN102486196A (en) Fastening piece as well as driving piece matched with fastening piece and punch for forming fastening piece
US20100129176A1 (en) Screw head recess drive and corresponding driver tool and recess punch
TWI700152B (en) Screwing tool and corresponding screw
KR20180041669A (en) A tapered lobe driver and fastener
JP2008151182A (en) Constant velocity universal joint
CN215240534U (en) Anvil and rotary tool having surface-to-surface contact with sleeve
JP2004332754A (en) Shaft member, rotary member, and rotation transmitting member
US9302375B2 (en) Driving feature
US20020045487A1 (en) Flange yoke for a universal joint and a universally jointed shaft
WO2003100272A1 (en) Screw tightening construction, and screw and screw tightening tool
CN210025095U (en) Driving assembly for generating impact force in rotary tool
CN215861394U (en) Sleeve part with inner hole provided with convex rectangular key
JP4262863B2 (en) Fixed type constant velocity universal joint
CA1166048A (en) Hexagon socket head bolt
CN201475188U (en) Connecting axle structure of cross-axle universal joint
JP2017032128A (en) screw
CN209145956U (en) A kind of connection drive mechanism of miniature impeller of pump and shaft
CN211992760U (en) Device for positioning and assembling mechanical locking mechanism in double holes

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant