CN218419963U - Reciprocating deflection mechanism - Google Patents

Abstract

The utility model discloses a reciprocating deflection mechanism, which is used for converting the rotation motion of an output shaft of a driving motor into the reciprocating swing motion of a swing shaft, the reciprocating deflection mechanism comprises an eccentric input component and a swing rod, the eccentric input component comprises an eccentric shaft, the eccentric shaft comprises an eccentric shaft main body, an input interface arranged at the rear end of the eccentric shaft main body and a driving part connected with the front end of the eccentric shaft main body; the front end part of the swing rod is connected with the swing shaft, the rear end part of the swing rod is provided with a driven part, the driven part is matched with the driving part through a spherical pair, the output shaft drives the eccentric shaft main body to rotate around the first axis, and the rotating motion of the eccentric shaft main body is converted into the reciprocating swinging motion of the swing shaft through the driving part and the driven part. The utility model discloses a reciprocal beat mechanism, through the slip of spherical pair and the luffing motion of second pendulum rod, all the other each direction's except that the horizontal oscillation unnecessary resultant force of eccentric shaft transmission is all dissolved to reduce unnecessary vibration and noise, reduced calorific capacity simultaneously.

Description

Reciprocating deflection mechanism

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a reciprocal beat mechanism.

Background

In an orthopedic surgery, a medical oscillating saw is a common tool for sawing bones, and generally comprises a main machine, a machine head and a sheath protecting saw blade, wherein a driving motor is arranged in the main machine. The machine head is internally provided with a swing shaft and a reciprocating swing mechanism, the reciprocating swing mechanism comprises an eccentric shaft and a shifting fork, one end of the eccentric shaft is connected with an output shaft of a driving motor, the other end of the eccentric shaft is provided with a driving part eccentrically arranged with a rotation axis of the driving part, one end of the shifting fork is connected with the swing shaft, the other end of the shifting fork is provided with a forked driven part, the driving part is clamped in the driven part, the outer side surface of the driving part is movably contacted with the inner side surface of the driven part, and the rotating motion is converted into the reciprocating swing motion through the eccentric shaft and the shifting fork. This kind of reciprocal beat mechanism, because the rigidity cooperation between the initiative portion of eccentric shaft and the driven part of shift fork, at the high-speed operation in-process of eccentric shaft, the vibration is big, the operation is noisy, it is violent to generate heat, is not convenient for last work for a long time, and saw cuts and shake the momentum big, if the sheath saw bit is protected in the adaptation, its accurate advantage of saw cutting can not effective performance.

SUMMERY OF THE UTILITY MODEL

To above-mentioned prior art current situation, the utility model aims to solve the technical problem that a reciprocal beat mechanism is provided, reduce the aircraft nose vibration under high-speed operation, noise and the interference of unfavorable factors such as generating heat, more steady, the noise is littleer, calorific capacity is still less when making the doctor use the aircraft nose, promotes the experience of doctor to the product and feels.

In order to solve the technical problem, the utility model provides a reciprocating deflection mechanism for convert the rotary motion of driving motor output shaft into the reciprocating swing motion of balance staff, include: the eccentric input assembly comprises an eccentric shaft, and the eccentric shaft comprises an eccentric shaft main body, an input interface which is arranged at the rear end of the eccentric shaft main body and is used for being connected with the output shaft, and a driving part which is connected with the front end of the eccentric shaft main body and is eccentrically arranged with the first axis; the front end part of the swing rod is connected with the swing shaft, the rear end part of the swing rod is provided with a driven part, the driven part is matched with the driving part through a spherical pair, the output shaft drives the eccentric shaft main body to rotate around a first axis, and the rotating motion of the eccentric shaft main body is converted into the reciprocating swinging motion of the swing shaft through the driving part and the driven part.

The utility model discloses a reciprocal beat mechanism because pendulum rod passes through spherical pair with the drive division to be connected, and this spherical pair is connected and can be made both under the effect of eccentric shaft, and relative slip keeps reliable stable connection under arbitrary angle, and stable sphere contact promptly can make the eccentric shaft when the motion, keeps abundant degree of freedom promptly, does not make both produce relative impact, can guarantee its both relative steady slip again.

In one embodiment, the driven part is provided with a spherical groove, the outer side wall of the driving part is spherical, and the inner side wall of the spherical groove and the outer side wall of the driving part together form the spherical pair.

In one embodiment, a heat dissipation groove is arranged on the inner side wall of the spherical groove.

In one embodiment, the heat dissipation grooves comprise axial heat dissipation grooves extending along the axial direction and radial heat dissipation grooves extending along the circumferential direction, and the axial heat dissipation grooves and the radial heat dissipation grooves are communicated with each other.

In one embodiment, the driven part is provided with a heat dissipation hole communicated with the heat dissipation groove.

In one embodiment, the driving portion includes a mandrel and a spherical bearing sleeved on the mandrel, a central axis of the mandrel is eccentrically disposed with respect to the first axis, and an outer side wall of an outer ring of the spherical bearing is spherical.

In one embodiment, the swing link comprises a first swing link and a second swing link; the front end of the first swing rod is coaxially and fixedly connected with the swing shaft, the front end of the second swing rod is connected with the rear end of the first swing rod, the second swing rod has a rotational degree of freedom around a second axis, the second axis is located in a swing plane of the first swing rod and perpendicular to the axis of the first swing rod, and the driven portion is arranged at the rear end of the second swing rod.

In one embodiment, the rear end portion of the first swing link and the front end portion of the second swing link are connected by a rotating shaft extending along the second axis.

In one embodiment, one of the rear end portion of the first swing link and the front end portion of the second swing link is provided with a U-shaped slot, the other of the rear end portion of the first swing link and the front end portion of the second swing link is provided with a clamp, the clamp is located in the slot, and the rotating shaft penetrates through the rear end portions of the clamps and is fixed on two slot walls of the U-shaped slot respectively.

In one embodiment, a sliding sleeve is sleeved in the shaft hole of the clamping head, and the rotating shaft penetrates through the sliding sleeve and is in clearance fit with the sliding sleeve.

The advantageous effects of the additional features of the present invention will be explained in the detailed description of the preferred embodiments of the present description.

Drawings

Fig. 1 is a sectional view of a medical pendulum saw according to an embodiment of the present invention;

FIG. 2 is a perspective view of the handpiece of the medical oscillating saw shown in FIG. 1;

FIG. 3 is a top view of the handpiece of the medical oscillating saw shown in FIG. 1;

FIG. 4 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a front view of the handpiece of the medical oscillating saw shown in FIG. 1;

FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5;

FIG. 7 is an enlarged partial view of FIG. 6 at B;

FIG. 8 is an enlarged view of a portion of FIG. 7 at B1;

FIG. 9 is a front view of the eccentric input assembly of the handpiece of the medical oscillating saw shown in FIG. 1;

FIG. 10 is a cross-sectional view of the eccentric input assembly shown in FIG. 9;

fig. 11 and 12 are perspective views of the first swing link in different directions, respectively;

FIG. 13 is a perspective view of a first swing link of the handpiece of the medical swing saw shown in FIG. 1;

FIG. 14 is a perspective view of the rotatable shaft of the handpiece of the medical oscillating saw shown in FIG. 1;

fig. 15-17 are schematic diagrams of the spherical bearing and the first swing link in cooperation, wherein fig. 15 is a state in which the mandrel of the eccentric shaft is rotated to the middle, and fig. 16 is a state in which the mandrel of the eccentric shaft is rotated to the bottom; fig. 17 shows a state in which the spindle of the eccentric shaft is turned to the top.

Description of reference numerals: 1. a sheath saw blade; 2. a machine head; 21. a handpiece housing; 211. a first shell; 212. a second shell; 22. a pendulum shaft; 221. a drive pin; 23. an eccentric input assembly; 230. an eccentric shaft; 231. an eccentric shaft main body; 232. an input interface; 233. a mandrel; 234. a spherical bearing; 234a, an outer sidewall; 235. a first bearing; 236. a second bearing; 237. a sleeve; 237a, an installation interface; 24. a first swing link; 241. a flat aperture; 242. clamping a head; 243. a shaft hole; 244. a first mounting groove; 25. a second swing link; 251. a driven part; 251a, a spherical groove; 251b, radial heat dissipation grooves; 251c, axial heat dissipation grooves; 251d, heat dissipation holes; 252. a card slot; 253. a second mounting groove; 26. a rotating shaft; 261. a cap portion; 262. mounting holes; 27. an elastic bayonet lock; 28. a sliding sleeve; 291. an elastic washer; 292. a first spacer; 293. a second gasket; 3. a host; 31. a main housing; 32. a drive motor; 321. an output shaft; 322. and (6) an output interface.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the specific details described below are merely exemplary of some embodiments of the invention, and that the invention is capable of other embodiments than those described herein. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

When an element is referred to herein as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The directional terms front, rear, upper and lower are defined as the positions of the components in the drawings and the positions of the components relative to each other, and are used for the sake of clarity and convenience in technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 1, the medical oscillating saw in the embodiment of the present invention comprises a main frame 3, a handpiece 2 and a sheath saw blade 1, wherein the main frame 3 comprises a main frame housing 31 approximately in a pistol shape and a driving motor 32 arranged in the main frame housing 31, the driving motor 32 has an output shaft 321 extending along an axial direction, and an output interface 322 is arranged at a front end of the output shaft 321. The machine head 2 comprises a machine head shell 21, a swing shaft 22 arranged in the machine head shell 21 and a reciprocating swing mechanism, wherein a machine head interface is arranged on the swing shaft 22. The reciprocating yaw mechanism is used for converting the rotation motion of the output shaft 321 into the reciprocating swing motion of the swing shaft 22. The sheath-protecting saw blade 1 comprises a saw blade body and a sheath, wherein a saw blade interface is arranged at the rear end of the saw blade body and connected with the machine head interface. When the saw is in work, the machine head 2 drives the saw blade body to swing so as to drive the saw teeth to swing to form sawing.

As shown in fig. 2, 3, and 4, the handpiece housing 21 includes a first housing 211 and a second housing 212, a center line of the first housing 211 is perpendicular to a center line of the second housing 212, and the second housing 212 is connected to a front end of the first housing 211. The swing shaft 22 is arranged in the second shell 212 in a manner of reciprocating swing around a swing axis, a machine head interface matched with the saw blade interface is arranged at the upper end of the swing shaft 22, and the machine head interface in the embodiment comprises a plurality of driving pins 221 arranged at the upper end of the swing shaft 22 at intervals along the circumferential direction. The reciprocating deflection mechanism is positioned in the first housing 211 and includes an eccentric input assembly 23, a first swing link 24 and a second swing link 25.

As shown in fig. 4, 6, 9 and 10, the eccentric input assembly 23 includes an eccentric shaft 230, the eccentric shaft 230 includes an eccentric shaft main body 231 rotatable about the first axis X1, an input interface 232 disposed at a rear end of the eccentric shaft main body 231, and a driving portion connected to a front end of the eccentric shaft main body 231, the input interface 232 is engaged with the output interface 322 of the output shaft 321, and a central axis of the driving portion is disposed eccentrically from the first axis X1. The front end of the first swing link 24 is coaxially and fixedly connected with the swing shaft 22, the first swing link 24 can swing around a swing axis, specifically, the front end of the first swing link 24 is provided with a flat hole 241 (see fig. 13), the outer side wall of the swing shaft 22 is flat (see fig. 6), and the front end of the first swing link 24 is sleeved on the swing shaft 22 to realize coaxial and fixed connection. The rear end of the first swing link 24 is connected to the front end of the second swing link 25, the second swing link 25 has a rotational degree of freedom along a second axis X2, the second axis X2 is located in a swing plane of the first swing link 24 and perpendicular to an axis of the first swing link 24, the rear end of the second swing link 25 is provided with a driven part 251, and the driven part 251 and the driving part are matched through a spherical pair.

The utility model discloses a reciprocal beat mechanism, because second pendulum rod 25 has rotatory degree of freedom, and second pendulum rod 25 passes through the sphere pair with the drive division and is connected, this sphere pair is connected and can is made both under eccentric shaft 230's effect, relative slip and keep reliable stable connection under arbitrary angle, stable sphere contact promptly can make eccentric shaft 230 when the motion, keeps abundant degree of freedom promptly, does not make both produce relative impact, can guarantee its both relative steady slip again.

Referring to fig. 11 and 12, the driven part 251 is provided with a spherical groove 251a as an example, the outer side wall of the driving part is spherical, and the inner side wall of the spherical groove 251a and the outer side wall of the driving part together form the spherical pair. Alternatively, the spherical groove 251a may be provided on the driving portion, and the driven portion 251 may be provided with a spherical outer sidewall engaged with an inner sidewall of the spherical groove 251 a.

The exemplary inner sidewall of the spherical groove 251a is provided with heat dissipation grooves 251b, 251c, the heat dissipation grooves 251b, 251c can reduce the spherical contact area between the inner sidewall of the spherical groove 251a and the outer sidewall 234a of the spherical bearing 234, and the high-pair contact of two spherical contacts is converted into the low-pair contact with less friction, which is beneficial to heat dissipation; moreover, the heat-resistant solid lubricating oil or grease is placed in the heat dissipating grooves 251b and 251c, so that the cooperative lustering and sliding performance of both spherical surfaces can be effectively increased. In order to increase the heat dissipation effect, the heat dissipation grooves 251b, 251c include axial heat dissipation grooves 251c extending in the axial direction and radial heat dissipation grooves 251b extending in the circumferential direction, and the axial heat dissipation grooves 251c and the radial heat dissipation grooves 251b communicate with each other. In order to further increase the heat dissipation effect, the driven portion 251 is provided with heat dissipation holes 251d communicating with the heat dissipation grooves 251b, 251 c.

Referring to fig. 9 and 10, the driving portion includes a spindle 233 and a spherical bearing 234 fitted over the spindle 233, a center line of the spindle 233 is eccentric with respect to the first axis X1, and an outer side wall 234a of an outer ring of the spherical bearing 234 is a spherical surface. With such a structure, the spherical outer side wall 234a and the inner groove wall of the spherical groove 251a have rolling friction, and the friction force is smaller than that of sliding friction in which the spindle 233 directly contacts the driven portion 251.

Referring to fig. 9 and 10, the exemplary eccentric input assembly 23 further includes first and second bearings 235 and 236 fitted over the front and rear ends of the eccentric shaft main body 231, the first and second bearings 235 and 236 supporting the eccentric shaft 230. Preferably, eccentric input assembly 23 further includes a sleeve 237, a front end of sleeve 237 being inserted and fixed within a rear end of first housing 211, a rear end of sleeve 237 being provided with a mounting interface 237a. The main unit 3 is provided with a main unit interface (see fig. 1) which is matched with the installation interface 237a, the installation interface 237a is inserted into the main unit interface during installation, and the input interface 232 of the eccentric shaft 230 is connected with the output interface 322 of the output shaft 321 of the driving motor 32.

As shown in fig. 7 and 8, the rear end of the first swing link 24 and the front end of the second swing link 25 are connected by a pivot shaft 26 extending along the second axis X2. Specifically, a U-shaped slot 252 (see fig. 11 and 12) is disposed at the front end of the second swing link 25, a chuck 242 (see fig. 13) is disposed at the rear end of the first swing link 24, a shaft hole 243 is disposed on the chuck 242, and the two ends of the rotating shaft 26 are respectively fixed on two groove walls of the slot 252 after passing through the shaft hole 243. Alternatively, the positions of the engaging groove 252 and the engaging head 242 may be reversed, that is, the engaging groove 252 is disposed on the rear end of the first swing link 24, and the engaging head 242 is disposed on the front end of the second swing link 25.

As shown in fig. 14, the rotation shaft 26 as an example is provided with a cap 261 at the rear end thereof, a mounting hole 262 extending in the radial direction at the front end thereof, and the front end of the rotation shaft 26 is locked by the elastic locking pin 27 passing through the mounting hole 262 through the cap 261 after passing through one groove wall of the locking groove 252, the locking head 242, and the other groove wall of the locking groove 252 in this order.

Referring to fig. 8, preferably, the shaft hole 243 of the chuck 242 is sleeved with the sliding sleeve 28, the rotating shaft 26 is inserted into the sliding sleeve 28 and is in clearance fit with the sliding sleeve 28, and the sliding sleeve 28 may be made of a wear-resistant material (such as copper) to increase the service life.

Preferably, an elastic component is arranged between the rear end part of the first swing link 24 and the front end part of the second swing link 25, so that vibration and noise are reduced through the elastic component, the transmission of swing motion is more flexible, and the bad condition that parts of the machine head 2 and the saw blade are damaged due to overlarge instantaneous load is reduced. As shown in fig. 8, the shock absorbing structure as an example includes an elastic washer 291 fitted around the rotation shaft 26 between two side surfaces of the chuck 242 and two groove walls of the locking groove 252. Preferably, the elastic washer 291 is a disc spring. In the process that the second swing link 25 drives the first swing link 24 to swing left and right, the instantaneous rigid force transmitted by the second swing link 25 is converted into elastic deformation force through the action of the elastic washer 291, and then the elastic deformation force is converted into the swing motion of the swing shaft 22 and the saw blade. The conversion through this structure can effectively reduce instantaneous load and striking when the high-speed high frequency left and right oscillations, reduce vibration and noise, can make the transmission of swing motion more flexible, reduce the bad condition that aircraft nose 2 spare part and saw bit take place the damage because of receiving too big instantaneous load.

Preferably, the shock absorbing structure further comprises a first gasket 292 and a second gasket 293 sleeved on the swing core shaft 233 at two sides of the elastic washer 291. The first and second spacers 292 and 293 may increase the elastic force on the one hand and reduce the wear of the elastic washer 291 on the other hand. Preferably, two side surfaces of the chuck 242 are provided with first mounting grooves 244, two groove walls of the U-shaped clamping groove 252 are provided with second mounting grooves 253, and the first gasket 292 and the second gasket 293 are respectively mounted in the first mounting groove 244 and the second mounting groove 253. The first pad 292 and the second pad 293 may be made of hardened wear-resistant polymer materials such as rubber, PC and the like; the elastic washer 291 may be made of rubber, or a stainless steel spring or a disc spring coated with a surface layer by surface-flexible coating.

As shown in fig. 16-17, when the eccentricity of the eccentric shaft 230 moves from zero to the maximum eccentricity position, the spherical bearing 234 on the eccentric shaft 230 exerts a force to swing left and right in the horizontal direction through the spherical pair due to the limit reaction of the first swing link 24, the rotating shaft 26, the first washer 292, the second washer 293, the elastic washer 291, and the like in the horizontal direction; meanwhile, the second swing link 25 continuously swings up and down around the sliding sleeve 28 (the rotating shaft 26) mounted on the rotating shaft 26 with the variation of the eccentricity of the eccentric shaft 230, and at this time, the inner spherical surface of the second swing link 25 and the outer spherical surface of the spherical bearing 234 form a spherical pair and slide flexibly. Through the sliding of the spherical pair and the up-and-down swinging of the second swing link 25, the excessive resultant force in all directions other than the horizontal swinging transmitted by the eccentric shaft 230 is resolved, thereby reducing unnecessary vibration and noise.

Moreover, when the eccentricity of the eccentric shaft 230 moves from zero to the maximum eccentricity position, at this time, the second swing link 25 is pressed along one side of the rotating shaft 26 in the horizontal direction under the sliding fit action of the spherical bearing 234, at this time, the fit inner side surface of one side of the second swing link 25 compresses the elastic washer 291 through the second washer 293 and further compresses the first washer 292, so that the first swing link 24 swings to one side, and the primary swing of the swing shaft 22 is realized, thereby driving the saw blade body mounted on the swing shaft 22 to swing and saw in a single direction; when the eccentric shaft 230 rotates to the other direction, the second swing link 25 is pressed to the other side, so as to further drive the swing shaft 22 and the saw blade body to saw in the opposite direction, thereby completing one complete sawing cycle. In the process that the second swing rod 25 drives the first swing rod 24 to swing left and right, the instantaneous rigid force transmitted by the swing shaft 22 is converted into elastic deformation force through the action of the first gasket 292, the second gasket 293 and the elastic washer 291, and then the elastic deformation force is converted into the swing motion of the swing shaft 22 and the saw blade body. The conversion through this structure can effectively reduce instantaneous load and striking when the high-speed high frequency left and right oscillations, reduce vibration and noise, can make the transmission of swing motion more flexible, reduce the bad condition that aircraft nose 2 spare part and saw bit take place the damage because of receiving too big instantaneous load.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (10)

1. A reciprocating yaw mechanism for converting rotary motion of an output shaft of a drive motor into reciprocating oscillatory motion of a yaw shaft, comprising:

the eccentric input assembly comprises an eccentric shaft, wherein the eccentric shaft comprises an eccentric shaft main body capable of rotating around a first axis, an input interface arranged at the rear end of the eccentric shaft main body and used for being connected with the output shaft, and a driving part which is connected with the front end of the eccentric shaft main body and is eccentrically arranged with the first axis;

the front end part of the swing rod is connected with the swing shaft, the rear end part of the swing rod is provided with a driven part, the driven part is matched with the driving part through a spherical pair, the output shaft drives the eccentric shaft main body to rotate around a first axis, and the rotating motion of the eccentric shaft main body is converted into the reciprocating swinging motion of the swing shaft through the driving part and the driven part.

2. The reciprocating yaw mechanism of claim 1, wherein the driven portion is provided with a spherical groove, an outer side wall of the driving portion is spherical, and an inner side wall of the spherical groove and an outer side wall of the driving portion jointly form the spherical pair.

3. The reciprocating yaw mechanism of claim 2, wherein a heat sink is disposed on an inner sidewall of the spherical recess.

4. The reciprocating yaw mechanism of claim 3 wherein the heat sink grooves include axially extending heat sink grooves and circumferentially extending radial heat sink grooves, the axially and radial heat sink grooves being in communication with one another.

5. The reciprocating yawing mechanism of claim 4, wherein the driven portion is provided with a heat dissipating hole communicating with the heat dissipating groove.

6. The reciprocating yawing mechanism of claim 1, wherein the driving portion comprises a mandrel and a spherical bearing sleeved on the mandrel, a central axis of the mandrel is eccentrically arranged with respect to the first axis, and an outer side wall of an outer ring of the spherical bearing is spherical.

7. The reciprocating yaw mechanism of claim 1, wherein the pendulum bar comprises a first pendulum bar and a second pendulum bar; the front end portion of the first swing rod is coaxially and fixedly connected with the swing shaft, the front end portion of the second swing rod is connected with the rear end portion of the first swing rod, the second swing rod has a rotational degree of freedom around a second axis, the second axis is located in a swing plane of the first swing rod and perpendicular to an axis of the first swing rod, and the driven portion is arranged at the rear end of the second swing rod.

8. The reciprocating yaw mechanism of claim 7, wherein a rear end of the first swing link and a front end of the second swing link are connected by a pivot shaft extending along the second axis.

9. The reciprocating yaw mechanism of claim 8, wherein a U-shaped slot is formed in one of the rear end of the first swing link and the front end of the second swing link, a clip is formed in the other of the rear end of the first swing link and the front end of the second swing link, the clip is located in the slot, and the rotating shaft passes through the rear ends of the clips and is fixed to two slot walls of the U-shaped slot respectively.

10. The reciprocating yaw mechanism of claim 9, wherein a sliding sleeve is sleeved in the shaft hole of the chuck, and the rotating shaft is inserted into the sliding sleeve and is in clearance fit with the sliding sleeve.

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