CN102092034A - Torque limiting impact mechanism for pneumatic impact wrench - Google Patents
Torque limiting impact mechanism for pneumatic impact wrench Download PDFInfo
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- CN102092034A CN102092034A CN2010106115528A CN201010611552A CN102092034A CN 102092034 A CN102092034 A CN 102092034A CN 2010106115528 A CN2010106115528 A CN 2010106115528A CN 201010611552 A CN201010611552 A CN 201010611552A CN 102092034 A CN102092034 A CN 102092034A
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Abstract
The invention relates to a torque limiting impact mechanism for a pneumatic impact wrench. The torque limiting impact mechanism comprises an impact cover, an impact hammer and an impact shaft, wherein the impact cover is driven by a pneumatic motor to rotate at high speed, the impact cover can throw the impact hammer by two impact pins to peen the impact shaft at high frequency, so that the impact shaft can output a continuous impact torque. The torque limiting impact mechanism is characterized in that the radial section of the impact shaft which corresponds to the impact hammer is composed of two circular arcs which are concentric with the axis of the impact shaft and have different radiuses, a smooth curve which connects the end points of the two circular arcs at one side and a straight segment which connects the end points of the two circular arcs at the other side and can pass through the center of the circular arc after being extended. When the pneumatic motor rotates anticlockwise, the impact face of the impact shaft is a plane formed by the straight segment, and the output torque is larger; when the pneumatic motor rotates clockwise, the impact hammer contacts with the impact shaft by ways of plane and line slide contact, the output torque is smaller, and thereby the output torque is limited. The torque limiting impact mechanism is suitable for occasions which need limiting a clockwise output torque and require a larger output torque.
Description
Technical field
The present invention relates to the Pneumatic immpacting spanner, relate to a kind of limited torque that is used for the Pneumatic immpacting spanner specifically and hit mechanism.
Background technology
In the prior art, two hammers that two hammers (single hammer) formula Pneumatic immpacting spanner adopts usually (single hammer) formula hit mechanism be by air motor drive hit cover, peening hammer is done high speed rotary motion together, make the peening hammer whipping, high-frequency knocking hit axle, by hitting the continuous impulsive torque of axle output.A peening hammer and a strike axle bump place are that the rigidity of face and face contacts, and the output torque that hits axle depends on the size of air motor power.For the air motor of impact wrench, the power output of rotating is close substantially, just makes that also the output torque of impact wrench rotating is also very approaching.
In the auto repair process, for tire can accurately be installed, tire attaching nut's moment of torsion needs to limit, and is defined as 76 as family-sized car tire attaching nut's screw-down torque
Ft-lbs, promptly 76 pounds/inch.This just needs to limit the forward output torque of impact wrench; If the forward output torque is excessive, when tightening the doughnut attaching nut, can damage screw bolt and nut, thus the potential safety hazard of bringing.And when unscrewing all tire attaching nuts, then need enough big moment of torsion, promptly the reverse output torque of impact wrench wants enough big.
Summary of the invention
At above-mentioned situation, the invention provides a kind of limited torque that is used for the Pneumatic immpacting spanner and hit mechanism, output torque with the rotating of solution prior art impact wrench is very close, and the forward output torque of impact wrench and reverse output torque can not satisfy the problem of need of work simultaneously.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of limited torque that is used for the Pneumatic immpacting spanner hits mechanism, comprises and hits cover, peening hammer and strike axle; Described strike cover mid portion is provided with a square through hole, makes the square through hole right side of hitting cover form right end cap, and the square through hole left side forms left end cap; Right end cap center and square through hole be adjacent to be provided with one and to be used for bearings mounted circular hole, and circular hole bottom to right end cap lateral surface is provided with a splined hole; The position corresponding with right end cap is provided with one and is used for bearings mounted shoulder hole on the left end cap; Position on the deflection of under the square through hole upper end deflection and lower end is provided with a pin-and-hole that runs through left end cap and right end cap respectively; Described peening hammer is arranged in the square through hole that hits cover, by be installed on hit cover up and down two of two groups of pin-and-holes hit pin and be connected with hitting to cover; Described strike axle is gone up two bearings is installed, and a bearing is installed in the circular hole that hits the cover right end cap, and another bearing is installed in the shoulder hole that hits the cover left end cap; It is characterized in that, with the radial section of the corresponding strike shaft portion of peening hammer by with hit that axis is concentric, the circular arc 1 and the circular arcs 2 of two different radiis, and smoothed curve that connects two circular arcs, one side two-end-point is connected the straightway composition of two circular arc opposite side two-end-points with one; The extended line of described straightway is by the center of circle of two circular arcs.
Further, the straight line of any 2 formation is all non-intersect with the axial line that hits axle on the smoothed curve of described connection two circular arcs one side two-end-point.
Further, the smoothed curve of described connection two circular arcs one side two-end-point is an involute.
Further, hit two positions that mid point overlaps that pin-and-hole and opposite side hit pin long lumbar hole two stomidium heart lines on axle axle center and the peening hammer described hit, the formed plane of straightway that connects two circular arc end points is corresponding with the plane of peening hammer endoporus setting.
Further, fillet is led in the angle of the straightway of described connection two circular arc opposite side two-end-points and two circular arcs formation.
The invention has the beneficial effects as follows that during reverse rotation, the face of overwhelming that hits axle is the plane, peening hammer is contacting of face or face with the way of contact of hitting axle, and the suffered hitting power of strike axle is big, and the output torque that hits axle is also big; When being rotated in the forward, the face of overwhelming that hits axle is shaped as smooth surface, the way of contact of peening hammer and strike axle is the sliding-contact of line and face, it is little to hit the suffered hitting power of axle, the output torque that hits axle is also less, be 1/10th of reverse output torque, thereby define the output torque that hits axle.
Description of drawings
Fig. 1 is used for the STRUCTURE DECOMPOSITION schematic diagram of the limited torque strike mechanism of Pneumatic immpacting spanner for the present invention is a kind of.
Fig. 2 is used for the structural representation of the strike mechanism of Pneumatic immpacting spanner for prior art.
Fig. 3 is used for the structural representation of the limited torque strike mechanism of Pneumatic immpacting spanner for the present invention is a kind of.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, a kind of limited torque that is used for the Pneumatic immpacting spanner hits mechanism, comprises hitting cover 100, peening hammer 200 and hitting axle 300; Described strike is covered 100 mid portions one square through hole is set, and makes the square through hole right side of hitting cover 100 form right end cap 110, and the square through hole left side forms left end cap 120; Right end cap 110 centers are adjacent with square through hole to be provided with one and to be used for bearings mounted circular hole 111, and circular hole 111 bottoms to right end cap lateral surface is provided with a splined hole 112; The position corresponding with right end cap 110 is provided with one and is used for bearings mounted shoulder hole 121 on the left end cap 120; Position on the deflection of under the square through hole upper end deflection and lower end is provided with a pin-and-hole 130 that runs through left end cap and right end cap respectively; Described peening hammer 200 is arranged in the square through hole that hits cover 100, by be installed on hit cover 100 about two of two groups of pin-and-holes 130 hit pin 400 and cover 100 with strike and be connected; On the described strike axle 300 two bearings is installed, a bearing 510 is installed in the circular hole 111 that hits the cover right end cap, and another bearing 520 is installed in the shoulder hole 121 that hits the cover left end cap.
Referring to Fig. 1, Fig. 2, the strike mechanism that prior art is used for the Pneumatic immpacting spanner and the radial section of peening hammer 200 corresponding strike shaft portions comprise with hit that axle 310 axis are concentric, the circular arc 3(number in the figure 311 of two different radiis) and circular arc 4(number in the figure 312), by the circular arc 3 of the minor diameter straightway 313 that is two symmetries to two lines of a large-diameter circular arc 4 transition.Two planes that described two straightways 313 form are corresponding with two planes that peening hammer 200 endoporus are provided with.Before the Pneumatic immpacting spanner used, the spline output shaft with a described splined hole 112 and an air motor was assembled together earlier.Drive strike cover 100 by air motor by its spline output shaft and do high speed rotary motion, hitting pin 400 rotates with hitting cover 100, hit pin 400 drive peening hammers 200 and do high speed rotary motion together, whipping peening hammer 200 high-frequency knocking are hit axle 310, make to hit the continuous impulsive torque of axle 310 outputs.When air motor forward and reverse rotation, the face of overwhelming that hits axle 310 is the plane, and peening hammer 200 is contacting of face or face with the way of contact of hitting axle 310, and strike axle 310 suffered hitting powers are big, and the output torque that hits axle 310 is also big; Be not suitable for the forward output torque and need the workplace that limits, require reverse output torque big.
Referring to Fig. 1, Fig. 3, a kind of limited torque that is used for the Pneumatic immpacting spanner of the present invention hits mechanism, with the radial section of peening hammer 200 corresponding strike shaft portions by with to hit axle 300 an axis circular arc 1(number in the figure concentric, two different radiis be 301) and circular arc 2(number in the figure be 302), and smoothed curve 303 that connects two circular arcs, one side two-end-point is connected two circular arc opposite side two-end-points with one straightway 304 forms, and the extended line of described straightway 304 passes through the center of circle " O " of circular arc 1 and circular arc 2.The straight line of any 2 formation is all non-intersect with the axial line that hits axle on the described smoothed curve 303, can be involute such as described smoothed curve 303; Described smoothed curve 303 forms smooth surface, one of them corresponding plane in two planes that the endoporus of described straightway 304 formation and peening hammer 200 is provided with, described straightway 304 is led fillet with the angle that circular arc 1, circular arc 2 form, and plane that promptly described straightway 304 forms and the little arc surface that hits axle and the angle between the great circle cambered surface are fillet.The present invention before use, earlier the spline output shaft with a described splined hole 112 and an air motor is assembled together.Drive strike cover 100 by air motor by its spline output shaft and do high speed rotary motion, hitting pin 400 rotates with hitting cover 100, hit pin 400 drive peening hammers 200 and do high speed rotary motion together, whipping peening hammer 200 high-frequency knocking are hit axle 300, make to hit the continuous impulsive torque of axle 300 outputs.During the air motor reverse rotation, the face of overwhelming that hits axle 300 is the plane, and peening hammer 200 is contacting of face or face with the way of contact of hitting axle 300, and strike axle 300 suffered hitting powers are big, and the output torque that hits axle 300 is also big; When air motor is rotated in the forward, the face of overwhelming that hits axle 300 is a smooth surface, the way of contact of peening hammer 200 and strike axle 300 is the sliding-contact of line and face, it is little to hit the suffered hitting power of axle 300, the output torque that hits axle 300 is also less, be 1/10th of reverse output torque, thereby define the output torque that hits axle 300.The present invention is applicable to that forward output torques such as doughnut installation need the workplace that limits, requires reverse output torque big.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (5)
1. a limited torque that is used for the Pneumatic immpacting spanner hits mechanism, comprises and hits cover, peening hammer and strike axle; Described strike cover mid portion is provided with a square through hole, makes the square through hole right side of hitting cover form right end cap, and the square through hole left side forms left end cap; Right end cap center and square through hole be adjacent to be provided with one and to be used for bearings mounted circular hole, and circular hole bottom to right end cap lateral surface is provided with a splined hole; The position corresponding with right end cap is provided with one and is used for bearings mounted shoulder hole on the left end cap; Position on the deflection of under the square through hole upper end deflection and lower end is provided with a pin-and-hole that runs through left end cap and right end cap respectively; Described peening hammer is arranged in the square through hole that hits cover, by be installed on hit cover up and down two of two groups of pin-and-holes hit pin and be connected with hitting to cover; Described strike axle is gone up two bearings is installed, and a bearing is installed in the circular hole that hits the cover right end cap, and another bearing is installed in the shoulder hole that hits the cover left end cap; It is characterized in that, with the radial section of the corresponding strike shaft portion of peening hammer by with hit that axis is concentric, the circular arc 1(301 of two different radiis) and circular arc 2(302), and the smoothed curve (303) of connection two circular arcs one a side two-end-point is connected straightway (304) composition of two circular arc opposite side two-end-points with one; The extended line of described straightway is by the center of circle of two circular arcs.
2. a kind of limited torque that is used for the Pneumatic immpacting spanner according to claim 1 hits mechanism, it is characterized in that the straight line of any 2 formation is all non-intersect with the axial line that hits axle on the smoothed curve of described connection two circular arcs one side two-end-point.
3. a kind of limited torque that is used for the Pneumatic immpacting spanner according to claim 2 hits mechanism, it is characterized in that the smoothed curve of described connection two circular arcs one side two-end-point is an involute.
4. a kind of limited torque that is used for the Pneumatic immpacting spanner according to claim 1 hits mechanism, it is characterized in that, hit two positions that mid point overlaps that pin-and-hole and opposite side hit pin long lumbar hole two stomidium heart lines on axle axle center and the peening hammer described hit, the formed plane of straightway that connects two circular arc end points is corresponding with the plane of peening hammer endoporus setting.
5. a kind of limited torque that is used for the Pneumatic immpacting spanner according to claim 1 hits mechanism, it is characterized in that fillet is led in the angle that the straightway of described connection two circular arc opposite side two-end-points and two circular arcs form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106115528A CN102092034A (en) | 2010-12-29 | 2010-12-29 | Torque limiting impact mechanism for pneumatic impact wrench |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106115528A CN102092034A (en) | 2010-12-29 | 2010-12-29 | Torque limiting impact mechanism for pneumatic impact wrench |
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| Publication Number | Publication Date |
|---|---|
| CN102092034A true CN102092034A (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106115528A Pending CN102092034A (en) | 2010-12-29 | 2010-12-29 | Torque limiting impact mechanism for pneumatic impact wrench |
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| CN (1) | CN102092034A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862442A (en) * | 2012-12-13 | 2014-06-18 | 苏州宝时得电动工具有限公司 | Power tool having impact wrench functions |
| CN109909938A (en) * | 2019-03-25 | 2019-06-21 | 北京弘益鼎视科技发展有限公司 | Impact wrench |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5346022A (en) * | 1993-01-29 | 1994-09-13 | Snap-On Incorporated | Torque limiting device for air impact tool |
| CN2700061Y (en) * | 2004-05-20 | 2005-05-18 | 峻億贸易股份有限公司 | Hammering device for pneumatic tool |
| CN2893258Y (en) * | 2006-04-11 | 2007-04-25 | 冠亿齿轮股份有限公司 | Air inlet device for pneumatic tool |
| US20070187125A1 (en) * | 2006-01-27 | 2007-08-16 | Sterling Robert E | Shock attenuating device for a rotary impact tool |
| CN201970252U (en) * | 2010-12-29 | 2011-09-14 | 上海英格索兰压缩机有限公司 | Torsion limit hitting mechanism of pneumatic impact wrench |
-
2010
- 2010-12-29 CN CN2010106115528A patent/CN102092034A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5346022A (en) * | 1993-01-29 | 1994-09-13 | Snap-On Incorporated | Torque limiting device for air impact tool |
| CN2700061Y (en) * | 2004-05-20 | 2005-05-18 | 峻億贸易股份有限公司 | Hammering device for pneumatic tool |
| US20070187125A1 (en) * | 2006-01-27 | 2007-08-16 | Sterling Robert E | Shock attenuating device for a rotary impact tool |
| CN2893258Y (en) * | 2006-04-11 | 2007-04-25 | 冠亿齿轮股份有限公司 | Air inlet device for pneumatic tool |
| CN201970252U (en) * | 2010-12-29 | 2011-09-14 | 上海英格索兰压缩机有限公司 | Torsion limit hitting mechanism of pneumatic impact wrench |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862442A (en) * | 2012-12-13 | 2014-06-18 | 苏州宝时得电动工具有限公司 | Power tool having impact wrench functions |
| CN103862442B (en) * | 2012-12-13 | 2016-08-03 | 苏州宝时得电动工具有限公司 | A kind of power tool with impact wrench function |
| CN109909938A (en) * | 2019-03-25 | 2019-06-21 | 北京弘益鼎视科技发展有限公司 | Impact wrench |
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Application publication date: 20110615 |