CN201970252U

CN201970252U - Torsion limit hitting mechanism of pneumatic impact wrench

Info

Publication number: CN201970252U
Application number: CN201020686601XU
Authority: CN
Inventors: 路易斯·吉; 周洪杰; 虞云忠; 林丽华
Original assignee: Shanghai Ingersoll Rand Compressor Ltd
Current assignee: Shanghai Ingersoll Rand Compressor Ltd
Priority date: 2010-12-29
Filing date: 2010-12-29
Publication date: 2011-09-14
Anticipated expiration: 2020-12-29

Abstract

The utility model provides a torsion limit hitting mechanism of a pneumatic impact wrench, which comprises a hitting cover, a hitting hammer and a hitting shaft, wherein the hitting cover is driven by a pneumatic motor to make high-speed rotating movement, and the hitting hammer is whipped by the hitting cover through two hitting pins to knock the hitting shaft at a high frequency, so that impact torsion is continuously output by the hitting shaft. The torsion limit hitting mechanism is characterized in that the radial cross section of the hitting shaft part corresponding to the hitting hammer consists of two arcs with different radiuses, a smooth curve and a straight line section, the two arcs are concentric with the axis of the hitting shaft, end points on one sides of the arcs are connected by the smooth curve, end points on the other sides of the arcs are connected by the straight line section, and the extension line of the straight line section penetrates through the circle centers of the arcs. When the pneumatic motor rotates anticlockwise, the hit surface of the hitting shaft is a plane formed by the straight line section, and the output torsion is large. When the pneumatic motor rotates clockwise, the contact mode of the hitting hammer with the hitting shaft is a linear and facial sliding contact, and the output torsion is small, so that the output torsion is limited. The torsion limit hitting mechanism is suitable for work places which need large anticlockwise output torsion but need to limit clockwise output torsion.

Description

Pneumatic immpacting spanner limited torque hits mechanism

Technical field

The utility model relates to the Pneumatic immpacting spanner, relates to a kind of Pneumatic immpacting spanner limited torque specifically and hits 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 utility model provides a kind of Pneumatic immpacting spanner limited torque to 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, the technical solution of the utility model is as follows:

Pneumatic immpacting spanner limited torque hits mechanism, comprises hitting 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 beneficial effects of the utility model are, during reverse rotation, the face of overwhelming that hits axle is the plane, and the peening hammer and the way of contact of hitting axle are contacting of face or face, and it is big to hit the suffered hitting power of axle, and an output torque that hits spool 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 the STRUCTURE DECOMPOSITION schematic diagram that the utility model Pneumatic immpacting spanner limited torque hits mechanism.

Fig. 2 is the structural representation of the strike mechanism of prior art Pneumatic immpacting spanner.

Fig. 3 is the structural representation that the utility model Pneumatic immpacting spanner limited torque hits mechanism.

The specific embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Referring to Fig. 1, Pneumatic immpacting spanner limited torque 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, in the strike mechanism of prior art Pneumatic immpacting spanner with 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, the utility model Pneumatic immpacting spanner limited torque 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 utility model 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 utility model 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 utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. Pneumatic immpacting spanner limited torque hits mechanism, comprises hitting 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. Pneumatic immpacting spanner limited torque 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. Pneumatic immpacting spanner limited torque 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. Pneumatic immpacting spanner limited torque 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. Pneumatic immpacting spanner limited torque 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.