CN116619308A

CN116619308A - Fixed torsion module for power tool

Info

Publication number: CN116619308A
Application number: CN202310548491.2A
Authority: CN
Inventors: 何全政
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-08-22

Abstract

The invention relates to a fixed torsion module for a power tool, which comprises a drive ring, two buffer units, an inner shaft piece and an outer shaft piece; the transmission ring comprises a body, a coupling part, a mandrel, two chambers and two brake blocks; the two buffer units are respectively arranged on the parts of the two accommodating chambers, so that an accommodating space is reserved in the two accommodating chambers respectively; the inner shaft member comprises an inner disc body, two inner protruding blocks extending into the two accommodating spaces, a shaft groove for extending the mandrel, a shaft rod and a clamping part; the outer shaft member comprises an outer disc body, an outer protruding block, a shaft tube, a braking part, a shaft hole and a clamping groove for the clamping part of the inner shaft member to extend in. Therefore, the torque fixing module can provide torque output with different magnitudes during forward rotation and reverse rotation, has high rotating speed and good working efficiency, and can reduce the manufacturing cost.

Description

Fixed torsion module for power tool

Technical Field

The present invention relates to power tools, and more particularly, to a torque module for a power tool.

Background

Power tools include pneumatic tools, electric tools, or hydraulic tools, which are typically coupled to a tool head via a rotatable shaft to turn a bolt or nut. When the rotation shaft is reversed to unscrew the nut or bolt, the power tool is required to provide as much torque as possible to unscrew the nut or bolt smoothly, however, when the user locks the nut or bolt, the torque of the rotation shaft in the forward direction needs to be controlled within a proper range so as not to cause damage to the bolt or nut due to too tight locking or to cause difficulty in disassembly in the future, and in many applications such as tire frame installation, the torque of a plurality of nuts must be consistent, otherwise uneven stress may cause accidents that part of the nuts are easy to loosen after long-term vibration.

At present, there is a pneumatic tool for controlling the torque of an output shaft by utilizing an oil pressure principle or a planetary gear reduction mechanism, but the pneumatic tool has high structural machining precision requirement, high cost, low rotating speed and poor working efficiency, so how to control the output torque at a high rotating speed, and the machining is easy to reduce the manufacturing cost, which is a technical problem to be solved in the industry.

Disclosure of Invention

An object of the present invention is to provide a fixed torque module for a power tool that provides different amounts of torque output during both forward and reverse rotation. Another object of the present invention is to provide a torque module for a power tool, which has high rotation speed, high working efficiency, and reduced manufacturing cost.

In order to achieve the above object, the present invention provides a torsion determining module for a power tool, the power tool having an output portion, the torsion determining module including a driving ring, two buffer units, an inner shaft member and an outer shaft member; the transmission ring comprises a body, a coupling part extending from the body and used for being coupled with the output part, a mandrel extending from one side of the body opposite to the coupling part, two chambers arranged on the body and respectively positioned at two sides of the mandrel, and two brake blocks extending from the body and being far away from the mandrel compared with the two chambers; the two buffer units are respectively arranged on the parts of the two accommodating chambers, so that an accommodating space is reserved in the two accommodating chambers respectively; the inner shaft piece comprises an inner disc body, two inner protruding blocks extending from the inner disc body and extending into the two accommodating spaces, a shaft groove arranged on the inner disc body and used for extending in a spindle of the transmission ring, a shaft rod extending from one side of the inner disc body opposite to one side of the two inner protruding blocks, and a clamping part arranged at one end of the shaft rod; the outer shaft piece comprises an outer disc body, an outer protruding block, a shaft tube, a braking part and a clamping groove, wherein the outer protruding block extends from the outer disc body towards the body of the transmission ring and is positioned at the outer side of the inner disc body; when the transmission ring rotates in a second direction opposite to the first direction, the two buffer units impact the two inner lugs to transmit the rotating force to the inner shaft, and then the rotating force is transmitted to the outer shaft through the clamping part and the clamping groove.

Therefore, the torque fixing module can provide torque output with different magnitudes during forward rotation (second direction) and reverse rotation (first direction), and has high rotating speed, good working efficiency and low manufacturing cost.

Drawings

FIG. 1 is a perspective view of a power tool with a torque module according to a first preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1;

FIGS. 3-4 are exploded views of a torque module for a power tool according to a first preferred embodiment of the present invention;

FIG. 5 is a side view of the outer shaft member of the torque module of the first preferred embodiment of the present invention;

FIG. 6 is a perspective view of a torque module for a power tool according to a first preferred embodiment of the present invention;

FIGS. 7 a-b are schematic diagrams illustrating the torque module in a reverse state according to a first preferred embodiment of the present invention;

FIGS. 8 a-b are schematic diagrams illustrating a torsion determination module in a forward rotation state according to a first preferred embodiment of the present invention;

FIG. 9 is a perspective view of a torque module for a power tool according to a second preferred embodiment of the present invention;

fig. 10 is a perspective view of a torque module for a power tool according to a third preferred embodiment of the present invention.

[ symbolic description ]

1,1a,1b fixed torsion module

2 power tool 3 pneumatic motor 4 output part

5 front side B rear side of output shaft F

10,10a,10b drive ring 11 body 12,12a,12b coupling

121, 121a axle 122 impact block

13b mandrel with embedded holes 14

16 chamber 161 gap

17 accommodating space 18 brake block

D1 first direction D2 second direction

20 buffer unit 22 elastomer 221 convex side

222 concave side 24 spring plate

26 cushion block

Inner shaft member 31 inner disc 32 inner projection of 30

34 shaft groove 35 shaft lever

36 end 37 middle section

38 clamping part 39 is cut to be flat

Outer boss of outer disk 42 of outer shaft 41 of 40

44 end of shaft tube 45

46 detent 47 shaft hole

48 inner end 49 clamping groove

491 cutting plane

Detailed Description

The technical content and features of the present invention will be described in detail below by way of three preferred embodiments with reference to the accompanying drawings, as shown in fig. 1 to 4, which are a torque determination module 1 for a power tool according to a first preferred embodiment of the present invention, wherein the torque determination module 1 is disposed on a power tool 2 in a built-in manner, and the power source of the power tool 2 is not limited, and may be, for example, electric, pneumatic or hydraulic driving.

The power tool 2 is driven by an impact group by an air motor 3, and the rotational power of the air motor 3 is transmitted forward through the impact group, for convenience of explanation, the front direction is the arrow F direction in fig. 2, and the rear direction is the arrow B direction, and the impact group is the output part 4 of the power tool 2 for outputting the rotational power of the air motor 3. The structure of the power tool and its pneumatic motor and impact set is also not described in detail herein, but in other embodiments, the impact set may be omitted and the output shaft 5 of the pneumatic motor 3 or other components may be used as the output portion 4.

The torque module 1 comprises a driving ring 10, two buffer units 20, an inner shaft 30 and an outer shaft 40.

The driving ring 10 is made of metal material and comprises a body 11 with a short cylindrical shape, a coupling portion 12 extending from the body 11 backward for coupling with the output portion 4, a spindle 14 extending from one side of the body 11 opposite to the coupling portion 12 forward, two chambers 16 disposed on the body 11 and respectively located at two sides of the spindle 14, and two stopper blocks 18 extending from the body 11 forward and away from the spindle 14 compared with the two chambers 16. The coupling portion 12 has a shaft 121 and two impact blocks 122 extending from the shaft 121 for receiving the intermittent striking force of the impact set, and the structure of the coupling portion 12 can be changed with the output portion 4, so long as the cross section of the outer periphery of the shaft 121 is non-circular and can receive the rotation power of the output portion 4. The spindle 14 is located at the rotation center of the body 11. The two chambers 16 have the same shape and are symmetrical to the spindle 14, the detent block 18 is located at the periphery of the two chambers 16, and the detent block is symmetrical to the spindle 14 and has an arc shape, but the shapes of the chambers 16 and the detent block 18 can be changed as required.

The two buffer units 20 are respectively arranged at the parts of the two chambers 16, so that a containing space 17 is respectively reserved in the two chambers 16; each of the buffer units 20 includes an arc-shaped elastic body 22, two arc-shaped elastic pieces 24 and a cushion block 26, wherein the elastic body 22 is made of natural or artificial polymer materials, such as rubber or silica gel, and can elastically deform to have the effect of buffering and absorbing shock, the two elastic pieces 24 are made of metal materials, are arranged in parallel and are abutted against a convex side 221 of the elastic body 22, and a gap 161 is reserved between a concave side 222 of the elastic body 22 and the inner wall of the accommodating chamber 16, as shown in fig. 7b, the elastic body 22 can be greatly deformed to provide more buffering space, the two elastic pieces 24 are supported by the elastic body 22 and can also provide a better buffering effect, and the cushion block 26 is made of metal materials and has a certain thickness, so that the elastic pieces 24 are better in impact resistance to be protected from being damaged by continuous impact.

The inner shaft 30 includes a circular inner disc 31, two inner protrusions 32 extending from the inner disc 31 backward and extending into the two accommodating spaces 17, a shaft slot 34 disposed at the rear side of the inner disc 31 for the spindle 14 of the driving ring 10 to extend in, a shaft 35 extending from the inner disc 31 forward opposite to one side of the two inner protrusions 32, and a clamping portion 38 at one end 36 of the shaft 35. The two inner protrusions 32 are arc-shaped and adjacent to the two cushion blocks 26, so that the cushion blocks 26 are located between the elastic pieces 24 and the inner protrusions 32, but in other embodiments, if the two elastic pieces 24 are thicker, the cushion blocks 26 may be omitted, i.e. the two elastic pieces 24 are located between the inner protrusions 32 and the elastic body 22, and the elastic body 22 and the elastic pieces 24 are arc-shaped and protrude towards the inner protrusions 32. The shaft slot 34 is configured to allow the spindle 14 to extend into the shaft slot to ensure that the inner shaft member 30 and the driving ring 10 rotate concentrically, and the two ends of the shaft 35 are enlarged relative to the middle section 37, so that the thinner middle section 37 can be stressed and deformed in torsion to absorb part of the rotational torque, and at the same time, maintain sufficient structural strength to avoid breakage due to the lack of the rotational force, and the engaging portion 38 has a cutting plane 39, but can transmit the rotational force to the outer shaft member 40 as long as the outer circumference thereof has a non-circular cross section, as described in detail below.

The outer shaft member 40 includes a circular outer disc 41, an outer protrusion 42 extending from the outer disc 41 toward the main body 11 (i.e. backward) of the driving ring 10 and located outside the inner disc 31, a shaft tube 44 extending from the outer disc 41 opposite to one side of the outer protrusion 42, a detent 46 located at a distal end 45 of the shaft tube 44, a shaft hole 47 extending from the outer disc 41 to the inside of the shaft tube 44 for the shaft rod 35 of the inner shaft member 30 to extend into, and a locking slot 49 located at an inner end 48 of the shaft hole 47 for the locking portion 38 of the inner shaft member 30 to extend into, as shown in fig. 5. The outer protrusion 42 is arc-shaped and is located at the outer side of the inner disc 31 in a staggered manner with the two braking blocks 18, the shaft tube 44 is sleeved outside the shaft rod 35 of the inner shaft member 30 through the shaft hole 47, the braking portion 46 is square column-shaped, but other shapes can be changed, for example, the outer circumference cross section is non-circular or the inner circumference cross section is tubular, the rotation power can be transmitted, and in practical use, a user can sleeve a suitable tool head (not shown) such as a socket wrench on the braking portion 46, so as to drive a nut or a bolt. As shown in fig. 5, the inner peripheral edge of the engaging groove 49 is complementary to the engaging portion 38, and has a two-sided surface 491, so that the outer shaft member 40 can be driven by the inner shaft member 30, and in other embodiments, the engaging groove 49 has a non-circular cross-section at its inner peripheral edge for receiving the rotational force from the inner shaft member 30.

As shown in fig. 2 and 6, the inner disc 31 is located between the outer disc 41 and the body 11 of the driving ring 10. When the user tries to loosen the nut to rotate (reverse) the output portion 4 of the power tool 2 counterclockwise, the output portion 4 of the power tool 2 is driven by the output portion 10 to rotate in a first direction D1 (i.e. counterclockwise), and the two brake blocks 18 strike the outer protrusion 42 to transmit the rotation force from the transmission ring 10 to the outer shaft member 40, and the two brake blocks 18 and the outer protrusion 42 are far from the spindle 14, i.e. the moment arm is long, so that the moment is large, and a large rotation torque can be generated; as shown in fig. 7b, a gap is still left between the inner wall of the chamber 16 of the driving ring 10 and the two inner protrusions 32, so that the rotational force of the driving ring 10 is not transmitted to the inner shaft 30.

Conversely, when the user is about to screw the nut to rotate the output portion 4 of the power tool 2 clockwise (forward rotation), as shown in fig. 8a, the transmission ring 10 rotates in a second direction D2 (i.e. clockwise) opposite to the first direction D1, the two brake blocks 18 are far away from the outer bump 42 and do not transmit the rotation force from the transmission ring 10 to the outer shaft 40, and as shown in fig. 8b, the two buffer units 20 transmit the rotation force of the transmission ring 10 to the inner shaft 30 by the two pads 26 striking the two inner bump 32, and transmit the rotation force to the outer shaft 40 by the clamping portion 38 and the clamping groove 49, and the generated rotation torque is smaller because the two inner bump 32 is closer to the spindle 14, i.e. the moment arm is shorter, and the clamping portion 38 and the clamping groove 49 are also closer to the axis where the spindle 14 is located, so that the transmitted rotation torque is further reduced.

Through the design, the fixed torsion module 1 for the power tool can provide torque output with different magnitudes during forward rotation and reverse rotation, and the output rotating speed is not reduced because the outer shaft 40 and the output part 4 of the power tool 2 synchronously rotate, so that the rotating speed of the positive rotation or the reverse rotation can reach 8000-9000 revolutions per minute, the fixed torsion module has excellent working efficiency, the part machining precision is not as high as that of the known oil pressure mechanism, the manufacturing cost can be greatly reduced due to easier machining, and the fixed torsion module has market potential.

Based on the design spirit of the present invention, the structure of the fixed torsion module may be changed, as shown in fig. 9, which is a fixed torsion module 1a provided in the second preferred embodiment of the present invention, and the structure is substantially the same as that of the first embodiment, except that the coupling portion 12a of the driving ring 10a is a hexagonal shaft post 121a matched with the output portion of a different power tool; fig. 10 shows a torsion fixing module 1b according to a third preferred embodiment of the present invention, which has a structure substantially the same as that of the first embodiment, and only the difference is that the coupling portion 12b of the driving ring 10b is a hexagonal embedded hole 13b matched with the output portion of a different power tool, so that the torsion fixing module 1b can be externally connected to the square columnar output shaft of a commercially available power tool, thereby making the application of the present invention more extensive. In fact, the coupling portion of the driving ring may be a shaft with a non-circular cross-section at its outer periphery, or a hole with a non-circular cross-section at its inner periphery, and the buffer unit may be modified to have other structures for absorbing the force, such as springs, and these easily conceivable structural variations are intended to be covered by the claims of the present invention.

Claims

1. A torque module for a power tool, the power tool having an output, the torque module comprising:

the driving ring comprises a body, a coupling part extending out of the body and used for being coupled with the output part, a mandrel extending out of the body opposite to one side of the coupling part, two chambers arranged on the body and respectively positioned at two sides of the mandrel, and two brake blocks extending out of the body and far away from the mandrel compared with the two chambers;

the two buffer units are respectively arranged on parts of the two accommodating chambers, so that accommodating spaces are respectively reserved in the two accommodating chambers;

the inner shaft piece comprises an inner disc body, two inner protruding blocks, a shaft groove, a shaft rod and a clamping part, wherein the inner disc body extends out of the inner disc body and stretches into the two accommodating spaces; and

the outer shaft piece comprises an outer disc body, an outer protruding block, a shaft tube, a braking part and a clamping groove, wherein the outer protruding block extends from the outer disc body towards the body of the transmission ring and is positioned at the outer side of the inner disc body;

when the transmission ring rotates in a second direction opposite to the first direction, the two buffer units impact the two inner lugs to transmit the rotating force to the inner shaft, and then the rotating force is transmitted to the outer shaft through the clamping part and the clamping groove.

2. The torsion module for a power tool according to claim 1, wherein the buffer unit comprises an elastic body and at least one elastic sheet located between the inner bump and the elastic body.

3. The torque module for a power tool of claim 2, wherein the elastomer is a natural or artificial polymer material.

4. The torsion module for a power tool according to claim 2, wherein the buffer unit further comprises a spacer located between the spring and the inner bump.

5. The torsion module for a power tool according to claim 2, wherein the elastic body and the elastic piece are both in an arc shape protruding toward the inner protrusion.

6. The torque module for a power tool of claim 1, wherein the coupling portion of the drive ring is a post having an outer peripheral cross-section that is non-circular or a socket having an inner peripheral cross-section that is non-circular.

7. The torque module for a power tool of claim 1, wherein the shaft is enlarged at both ends thereof relative to the middle section.

8. The torque module for a power tool of claim 1, wherein the outer peripheral cross-section of the snap-in portion of the inner shaft member is non-circular and the inner peripheral cross-section of the snap-in groove of the outer shaft member is non-circular.

9. The torque module for a power tool of claim 1, wherein the detent portion has a non-circular outer peripheral cross-section or a non-circular inner peripheral cross-section.