CN217510549U

CN217510549U - Swing saw transmission mechanism and swing saw head

Info

Publication number: CN217510549U
Application number: CN202221347295.6U
Authority: CN
Inventors: 郭毅军; 王习金
Original assignee: Chongqing Xishan Science and Technology Co Ltd
Current assignee: Chongqing Xishan Science and Technology Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-09-30
Anticipated expiration: 2032-05-31

Abstract

The utility model provides a pendulum saw drive mechanism and pendulum saw aircraft nose belongs to medical instrument technical field. Pendulum saw drive mechanism includes: a power input assembly; the cam is rotationally arranged at the power output end of the power input assembly, and the peripheral surface of the cam is a cam surface; the driven piece is matched with the cam surface, and the power input assembly drives the cam to rotate so as to enable the driven piece to reciprocate under the action of the cam surface; the cam surface comprises at least two convex parts which are uniformly distributed along the circumferential direction by taking the rotating axis of the cam as the center. An oscillating saw head comprising: a housing; the oscillating saw transmission mechanism is arranged in the shell; and the saw blade mounting assembly is connected with a driven piece of the oscillating saw transmission mechanism. The utility model discloses the cam is in balanced state at the rotation in-process, can not vibrate because of the quality inequality. Under the condition that the motion frequency of the driven part is kept fixed, the rotating speed of the cam is reduced, and the rotation noise of the cam is reduced.

Description

Swing saw transmission mechanism and swing saw head

Technical Field

The utility model belongs to the technical field of medical instrument, especially, relate to a pendulum saw drive mechanism and pendulum saw aircraft nose.

Background

The oscillating saw is a medical instrument used in surgical operation, and an oscillating saw head of the oscillating saw comprises a shell, a saw blade mounting assembly arranged on the shell and used for mounting a saw blade, an oscillating saw transmission mechanism used for driving the saw blade to swing and a power input assembly used for providing power for the oscillating saw transmission mechanism. At present, the oscillating saw transmission mechanism generally comprises an eccentric wheel arranged in a rotating way and a driven part matched with the eccentric wheel, the driven part is connected with the saw blade, and when the eccentric wheel rotates at a high speed, the driven part reciprocates under the action of the eccentric wheel so as to drive the saw blade to swing at a high speed to realize cutting. When the eccentric wheel rotates at a high speed, unbalanced inertia force can be generated, so that the saw oscillating head generates larger vibration, parts such as a bearing and the like generate mechanical noise, and the service life of the saw oscillating head is also influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, an object of the present invention is to provide a pendulum saw transmission mechanism and a pendulum saw head for solving the problems of the pendulum saw transmission mechanism in the prior art, such as large eccentric wheel vibration.

To achieve the above and other related objects, the present invention provides a pendulum saw transmission mechanism, including:

a power input assembly;

the cam is rotationally arranged at the power output end of the power input assembly, and the peripheral surface of the cam is a cam surface;

the driven piece is matched with the cam surface, the power input assembly drives the cam to rotate, and the driven piece reciprocates under the action of the cam surface;

the cam surface comprises at least two protruding parts, the protruding parts are arranged at intervals in the circumferential direction of the cam, the adjacent protruding parts are arranged in the circumferential direction of the cam in a spaced mode, transition parts are arranged between the protruding parts, the protruding parts and the transition parts are arranged in the circumferential direction of the cam in an alternating mode, and the protruding parts are evenly distributed in the circumferential direction with the rotating axis of the cam as the center.

Optionally, the number of the protruding portions is an odd number, the follower includes two contact portions that are oppositely disposed, two the contact portions are disposed at intervals, the cam is disposed between the two contact portions, the contact portions are used for being matched with the cam surface of the cam, and when one protruding portion of the cam rotates to correspond to one of the contact portions, the other contact portion corresponds to the transition portion of the cam.

Optionally, the follower is a shifting fork, a swinging point is arranged on the shifting fork, the contact part is arranged at one end of the shifting fork, a gap exists between the swinging point and the contact part, a swinging axis of the shifting fork is perpendicular to a rotating axis of the cam, and the shifting fork swings around the swinging point under the action of the cam.

Optionally, the number of the protrusions is 3.

Optionally, a roller is disposed on the contact portion, the follower is engaged with the cam surface through the roller, and a rotation axis of the roller is perpendicular to a rotation axis of the cam.

Optionally, a reset mechanism is connected to the follower, and the reset mechanism is used for keeping the follower in contact with the cam surface of the cam.

Optionally, the return mechanism is a spring.

Optionally, the power input assembly includes an input shaft, one end of the input shaft connected to the cam is provided with a single-sided flat square structure, the cam is sleeved on the input shaft through a central hole, and the central hole is provided with a single-sided flat square hole matched with the single-sided flat square structure.

Optionally, one end of the input shaft connected to the cam is provided with a limiting step and a limiting groove, a spring collar is arranged in the limiting groove, and the cam is axially limited by the limiting step and the spring collar. The utility model also provides a pendulum saw aircraft nose, include: a housing, a saw blade mounting assembly; the oscillating saw transmission mechanism is arranged in the shell; the saw blade mounting assembly is connected with a driven member of the oscillating saw transmission mechanism.

As above, the utility model discloses a pendulum saw drive mechanism and pendulum saw aircraft nose has following beneficial effect: because the cam surface has at least two convex parts which are arranged in central symmetry with the rotating axis of the cam, the cam is in a balanced state in the rotating process and cannot vibrate due to uneven mass. Meanwhile, the number of the convex parts is increased, and the rotating speed of the cam is reduced under the condition that the motion frequency of the driven part is kept fixed, so that the rotation noise of the cam is reduced.

Drawings

Fig. 1 is a schematic cross-sectional view of an oscillating saw head according to an embodiment of the present invention;

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

FIG. 3 is a schematic structural view of a cam and an input assembly according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a shifting fork according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a cam according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a reset mechanism in an embodiment of the present invention.

Description of the reference numerals: the device comprises a cam 1, a shifting fork 2, an input shaft 3, a shell 4, a swing shaft 5, a saw blade 6, a spring retainer ring 7, a roller 8, a rotating bearing 9, a bearing seat 10, a connecting socket 11, a fork arm 12, a convex part 13, a transition part 14, a limiting step 15, a spring 16 and a limiting groove 17.

Detailed Description

The following description is given for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure of the present invention.

Please refer to fig. 1 to 6. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

Referring to fig. 1 to 5, the present embodiment provides a transmission mechanism of an oscillating saw, which includes a power input assembly, a cam 1 and a driven member. The cam 1 is rotatably arranged at the power output end of the power input assembly, and the power input assembly can drive the cam 1 to rotate. The follower is used for cooperating with the cam surface, and can reciprocate under the action of the cam surface when the cam 1 rotates. The outer peripheral surface of the cam 1 is a cam surface, the cam surface comprises at least two protrusions 13, and the protrusions 13 are arranged at intervals along the circumferential direction of the cam 1 and are uniformly distributed along the circumferential direction by taking the rotation axis of the cam 1 as the center. The cam surface between adjacent convex parts 13 is a transition part 14, the convex parts 13 and the transition parts 14 are sequentially alternated along the circumferential direction of the cam 1, and the distance between the transition part 14 and the rotating axis of the cam 1 is smaller than the distance between the convex parts 13 and the rotating axis of the cam 1.

Since the cam surface has at least two protrusions 13 and is symmetrical with respect to the rotational axis of the cam 1, the cam 1 is in a balanced state during rotation and does not vibrate due to mass unevenness. Meanwhile, the number of the convex parts 13 is increased, and the rotating speed of the cam 1 is reduced under the condition that the motion frequency of the driven part is kept fixed, so that the rotation noise of the cam 1 is reduced.

The cam 1 and the driven piece can adopt a geometric closed structure, the driven piece and the cam surface of the cam 1 are always kept in contact through the geometric shapes of the driven piece and the cam 1, and the cam has the advantages of compact structure, high reliability and the like.

As shown in fig. 2 to 5, in the present embodiment, the number of the protruding portions 13 is odd, the follower includes two contact portions that are oppositely disposed, the two contact portions are disposed at an interval, the cam 1 is disposed between the two contact portions, the contact portions are configured to cooperate with the cam surface of the cam 1, and when one protruding portion 13 of the cam 1 rotates to correspond to one contact portion, the other contact portion corresponds to the transition portion 14 of the cam 1. The projection profile of the cam surface in the direction of the rotating axis of the cam 1 is the profile line of the cam 1, and the distance between any two parallel tangent lines on the profile line of the cam 1 is equal to the distance between the two contact parts, so that the cam 1 is always in contact with the two contact parts in the rotating process. The greater the number of projections 13, the greater the variation in height between the projections 13 and the transition portion 14 in the radial direction of the cam 1, and the smaller the amplitude of movement of the follower. As shown in fig. 5, the number of the protrusions 13 in this embodiment is 3, so as to satisfy the requirement of the motion amplitude of the driven member while ensuring the geometric closure.

Specifically, as shown in fig. 4, the driven member is a shifting fork 2, a swinging point is arranged on the shifting fork 2, a contact portion is arranged at one end of the shifting fork 2 and is arranged at an interval with the contact portion, a rotation axis of the shifting fork 2 is perpendicular to a rotation axis of the cam 1, and the cam 1 is matched with the contact portion, so that the shifting fork 2 is driven to swing around the swinging point. In this embodiment, one end of the shifting fork 2 is fixedly connected to the swing shaft 5 for installing the saw blade 6, the other end of the shifting fork 2 is provided with two fork arms 12 arranged at intervals, and one side of each fork arm 12 close to the cam 1 is a contact part for being matched with the cam 1. In this embodiment, be provided with gyro wheel 8 on the contact site, shift fork 2 passes through gyro wheel 8 and cam surface cooperation, and the axis of rotation of gyro wheel 8 is perpendicular to the axis of rotation of cam 1. When shift fork 2 swung, there was relative displacement contact site on cam 1's axis of rotation direction and between the cam surface, and gyro wheel 8 can change the friction between contact site and the cam surface into rolling friction, reduces the wearing and tearing between cam 1 and the shift fork 2, is favorable to promoting the reliability and the life of product.

The cam 1 and the follower can adopt a force closed structure, and the follower and the cam surface of the cam 1 are always kept in contact by means of gravity, a spring 16 and the like. A reset mechanism may be coupled to the follower to maintain the follower in contact with the cam surface of the cam 1. As shown in fig. 6, in the present embodiment, there is only one contact portion between the follower and the cam 1, and the return mechanism is a spring 16, and is connected to the follower, and the follower is held in contact with the cam surface of the cam 1 by the tensile force of the spring 16. The reset mechanism can also be a balancing weight, but the gravity reset is restricted by position, angle and the like, and the application is limited.

In this embodiment, the power input assembly includes an input shaft 3, one end (i.e., the power output end) of the input shaft 3 connected to the cam 1 is provided with a single-sided flat square structure, the cam 1 is sleeved on the input shaft 3 through a central hole, and the central hole of the cam 1 is provided with a single-sided flat square hole matched with the single-sided flat square structure. The single-side flat square structure is formed by cutting a plane parallel to the axis of the cylinder on the cylinder, and can be matched with the single-side flat square hole on the cam 1 to transmit torque.

In this embodiment, a limiting step 15 and a limiting groove 17 are disposed at one end of the input shaft 3 connected to the cam 1, a spring retainer 7 is disposed in the limiting groove 17, and the input shaft 3 axially limits the cam 1 through the limiting step 15 and the spring retainer 7. The circlip 7 engages with the limit step 15 to restrict the position of the cam 1 in the axial direction of the input shaft 3, thereby fixing the cam 1 to the input shaft 3.

Referring to fig. 1 to 5, the present invention further provides a saw oscillating head, which includes the saw oscillating transmission mechanism, a housing 4, a power input assembly, and a saw blade mounting assembly connected to a driven member of the saw oscillating transmission mechanism.

The oscillating saw transmission mechanism is arranged in the shell 4, and the power input component is connected with the cam 1 of the oscillating saw transmission mechanism and is used for driving the cam 1 to rotate. The blade mounting assembly is connected to a driven member of the oscillating saw drive mechanism for mounting the saw blade 6. In this embodiment, saw bit installation component includes oscillating axle 5, and shift fork 2 fixed connection makes oscillating axle 5 rotate around its axis on oscillating axle 5, and the one end of saw bit 6 is connected on oscillating axle 5, and when oscillating axle 5 rotated, saw bit 6 swung to saw cut.

As shown in fig. 1 to 3, the power input assembly further includes a bearing seat 10, the bearing seat 10 is fixedly disposed on the housing 4, and the input shaft 3 is rotatably disposed in the bearing seat 10. Specifically, a rotating bearing 9 is arranged between the input shaft 3 and a bearing seat 10, and the input shaft 3 rotates in the bearing seat 10 through the rotating bearing 9.

One end of the input shaft 3 extends into the shell 4 and is fixedly connected with the cam 1, the other end of the input shaft 3 is exposed out of the shell 4, one end of the input shaft 3 exposed out of the shell 4 is provided with a connection socket 11 for connection, and the connection socket 11 is used for connecting a power source, so that the replacement of the saw oscillating machine head and the connection with the power source are facilitated.

In summary, in the saw oscillating transmission mechanism and the saw oscillating head provided by the embodiment, since at least two protrusions 13 on the cam surface are arranged in a central symmetry manner with respect to the rotation axis of the cam 1, the cam 1 is in a balanced state in the rotation process, and vibration due to uneven mass is avoided. Meanwhile, the number of the convex parts 13 is increased, and the rotating speed of the cam 1 is reduced under the condition that the motion frequency of the driven part is kept fixed, so that the rotation noise of the cam 1 is reduced.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. It will be apparent to those skilled in the art that modifications and variations can be made to the above-described embodiments without departing from the spirit and scope of the invention, and it is intended that all equivalent modifications and variations be covered by the appended claims without departing from the spirit and scope of the invention.

Claims

1. An oscillating saw drive mechanism, comprising:

a power input assembly;

the cam surface comprises at least two protruding parts, the protruding parts are arranged at intervals along the circumferential direction of the cam, the adjacent protruding parts are transition parts, the protruding parts and the transition parts are alternately arranged along the circumferential direction of the cam, and the protruding parts are uniformly distributed along the circumferential direction by taking the rotating axis of the cam as the center.

2. The pendulum saw drive mechanism of claim 1, wherein: the quantity of bellying is the odd number, the follower includes two contact sites of relative setting, two the interval sets up between the contact site, the cam sets up two between the contact site, the contact site be used for with the cam surface cooperation of cam, when a bellying of cam rotates to with one when the contact site contacts, another the contact site with the transition portion of cam corresponds.

3. The pendulum saw drive mechanism of claim 2, wherein: the follower is a shifting fork, a swinging point is arranged on the shifting fork, the contact part is arranged at one end of the shifting fork, the swinging point is arranged at the other end of the shifting fork, the shifting fork winds around the swinging point under the action of the cam and swings, and the swinging axis of the shifting fork is perpendicular to the rotating axis of the cam.

4. The pendulum saw drive mechanism of claim 2, wherein: the convex part is 3.

5. The pendulum saw drive mechanism of claim 2, wherein: the contact part is provided with a roller, the driven piece is matched with the cam surface through the roller, and the rotation axis of the roller is perpendicular to the rotation axis of the cam.

6. The pendulum saw drive mechanism of claim 1, wherein: and the driven piece is connected with a resetting mechanism, and the resetting mechanism is used for keeping the driven piece in contact with the cam surface of the cam.

7. The pendulum saw drive mechanism of claim 6, wherein: the reset mechanism is a spring.

8. The oscillating saw drive mechanism of any one of claims 1-7, wherein: the power input assembly comprises an input shaft, a single-face flat square structure is arranged at one end, connected with the cam, of the input shaft, the cam is sleeved on the input shaft through a center hole, and a single-face flat square hole matched with the single-face flat square structure is formed in the center hole.

9. The pendulum saw drive mechanism of claim 8, wherein: and one end of the input shaft, which is connected with the cam, is provided with a limiting step and a limiting groove, a spring retainer ring is arranged in the limiting groove, and the cam is axially limited through the limiting step and the spring retainer ring.

10. An oscillating saw head, comprising: a housing, a saw blade mounting assembly, and the oscillating saw drive mechanism of any one of claims 1-9; the saw blade mounting assembly is connected with a driven piece of the swing saw transmission mechanism.