Threaded cam linkage differential

Abstract

The application provides a threaded cam linkage type differential, comprising: a threaded mechanism, a linkage cylinder and a cam mechanism connected in sequence; the threaded mechanism comprises a driving cylinder and a moving cylinder connected through threads, the moving cylinder is fixedly connected with the linkage cylinder through a first connecting piece, and the moving cylinder drives the linkage cylinder to move linearly under the action of the rotating threads of the driving cylinder; the cam mechanism comprises a cam cylinder and a second connecting piece, the second connecting piece is fixed on the linkage cylinder through a cam groove on the cam cylinder, and the second connecting piece moves in the cam groove under the action of the linear motion of the linkage cylinder to drive the cam cylinder to rotate. The application has the advantages of small structure, reasonable space occupation, convenient installation, no vibration problem in use like the existing planetary gear set structure, and higher transmission precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of differential, in particular to a screw cam linkage type differential. BACKGROUND

[0002] The differential applied in optical system is used for driving the rotation angle of lens to adjust the light transmittance of lens, so as to meet the adjustment demand of light transmittance in existing mechanical production.

[0003] The existing differential for optical is mostly planetary gear set structure, which has complex structure, large space occupation, is not suitable for miniaturization, has more complex assembly and debugging, obvious vibration and low transmission precision. SUMMARY

[0004] Therefore, the present application aims to provide a screw cam linkage type differential to solve the problems of complexity and obvious vibration of differential for optical.

[0005] In order to achieve the above purpose, the present application provides a screw cam linkage type differential, which comprises:

[0006] a screw mechanism, a linkage cylinder and a cam mechanism connected in sequence;

[0007] The screw mechanism comprises a driving cylinder and a moving cylinder connected by threads, the moving cylinder is fixedly connected with the linkage cylinder through a first connecting piece, and the moving cylinder drives the linkage cylinder to move linearly under the action of the rotating threads of the driving cylinder.

[0008] The cam mechanism comprises a cam cylinder and a second connecting piece, the second connecting piece is fixed on the linkage cylinder through a cam groove on the cam cylinder, and the second connecting piece moves in the cam groove under the action of the linear motion of the linkage cylinder to drive the cam cylinder to rotate.

[0009] Further, the differential further comprises a fixed cylinder, the fixed cylinder is sleeved on the periphery of the linkage cylinder, and is provided with an axial groove for the first connecting piece and the second connecting piece to pass through and move, and the cam cylinder is sleeved on the end of the fixed cylinder.

[0010] Further, the differential further comprises a first stop ring and an elastic member, the first stop ring is sleeved on the periphery of the connection between the fixed cylinder and the cam cylinder and is fixedly connected with the fixed cylinder, and the elastic member is sleeved on the periphery of the fixed cylinder, one end of the elastic member abuts against a first protrusion at the end of the driving cylinder, and the other end of the elastic member is fixedly connected with a second protrusion on the outer surface of the fixed cylinder.

[0011] Further, the differential further comprises a guide ball head plunger, the ball head end of the guide ball head plunger abuts against the linkage cylinder through the side wall of the fixed cylinder.

[0012] Further, the differential further comprises an appearance cylinder sleeved on the periphery of the elastic member, which is fixedly connected with the fixed cylinder.

[0013] Further, the screw mechanism further comprises a second blocking ring, which is located in the driving cylinder and is fixedly connected with the fixed cylinder and sleeved on the periphery of the end of the fixed cylinder, and the second blocking ring and the first protrusion at one end of the driving cylinder jointly limit the axial movement range of the moving cylinder.

[0014] Further, the screw mechanism further comprises a secondary lens barrel, which is located in the driving cylinder and is fixedly connected with the driving cylinder.

[0015] Further, the differential further comprises a gasket located between the elastic member and the driving cylinder.

[0016] Further, the first connecting member and the second connecting member each comprise a copper column and a bolt, and the bolt is fixedly connected with the linkage cylinder through the copper column.

[0017] Further, the cam mechanism further comprises a primary lens barrel, which is located in the cam cylinder and is fixedly connected with the cam cylinder.

[0018] From the above, it can be seen that the screw cam linkage type differential provided by the present application converts the rotary motion of the screw mechanism into the linear motion of the linkage cylinder, converts the linear motion of the linkage cylinder into the rotary motion of the cam, and realizes different rotary speeds of the screw mechanism and the cam mechanism, that is, differential changes of the screw mechanism and the cam mechanism. The differential has a small structure, reasonable space occupation, and convenient installation. In use, it does not have the vibration problem of the existing planetary gear set structure, has higher transmission precision, and because it is composed of sleeved cylindrical structures, the deviation between the axis of the differential and the axis through which light passes is smaller and more stable. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 is a sectional structure schematic view of the screw cam linkage type differential of the embodiment of the present application;

[0021] Figure 2A perspective view of a threaded cam linkage type differential gear according to an embodiment of the present application is shown in the figure.

[0022] Figure 3 A perspective view of a threaded cam linkage type differential gear according to an embodiment of the present application is shown in the figure.

[0023] In the figure: 0, differential gear; 1, threaded mechanism; 11, driving cylinder; 111, first protrusion; 12, moving cylinder; 13, first connecting piece; 14, second blocking ring; 15, secondary cylinder; 2, linkage cylinder; 3, cam mechanism; 31, cam cylinder; 311, cam groove; 32, second connecting piece; 33, main cylinder; 4, fixed cylinder; 41, axial groove; 42, second protrusion; 5, first blocking ring; 6, elastic piece; 7, guide ball head plunger; 8, appearance cylinder; 9, gasket. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present application clearer and more apparent, the present application is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects listed before the terms cover the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute positions of the described objects change.

[0026] As described in the background, the existing differential gears for optical systems are mostly planetary gear set structures, which are complex in structure, occupy a large space and are not suitable for miniaturization, and are more complex in assembly and debugging, have more obvious vibration and lower transmission precision.

[0027] To solve the above problems, the present application provides a differential gear with a threaded mechanism and a cam mechanism linkage to achieve differential changes in an optical system, which is small in structure, reasonable in space occupation, convenient to install, does not have vibration problems like the existing planetary gear set structure, has higher transmission precision, and because it is composed of a cylindrical structure, the deviation between the axis of the differential gear and the axis through which light passes is smaller and more stable.

[0028] The technical solutions of one or more embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] As shown in Figure 1 , Figure 2 and Figure 3 , the present application provides a threaded cam linkage type differential, comprising:

[0030] The threaded mechanism 1, linkage cylinder 2 and cam mechanism 3 are connected in sequence, the threaded mechanism 1 is used to convert rotary motion into linear motion and transmit to the linkage cylinder 2, the linkage cylinder 2 transmits linear motion to the cam mechanism 3, the cam mechanism 3 converts linear motion into rotary motion, and the rotary speed of the cam mechanism 3 is different from the rotary speed of the threaded mechanism 1, realizing differential.

[0031] The threaded mechanism 1 comprises a driving cylinder 11 and a moving cylinder 12 which are threadedly connected, the moving cylinder 12 is fixedly connected with the linkage cylinder 2 through a first connecting piece 13, the moving cylinder 12 drives the linkage cylinder 2 to move linearly under the rotating threaded action of the driving cylinder 11, the relationship between the rotary angle of the driving cylinder 11 and the linear moving length of the moving cylinder 12 is related to the pitch of the thread located therebetween, and the rotary angle of the driving cylinder 11 and the linear moving length of the moving cylinder 12 are positively correlated, that is, the greater the rotary angle of the driving cylinder 11, the longer the linear moving length of the moving cylinder 12.

[0032] In addition, the threaded mechanism 1 is provided in a sleeved cylinder shape, which can not only convert rotary motion into linear motion by the action principle of the threaded mechanism 1, but also enable light to be transmitted through the inside of the cylinder structure, being suitable for light transmission.

[0033] The cam mechanism 3 comprises a cam cylinder 31 and a second connecting piece 32, the second connecting piece 32 is fixed on the linkage cylinder 2 through a cam groove 311 on the cam cylinder 31, and the second connecting piece 32 moves in the cam groove 311 under the linear motion of the linkage cylinder 2 to drive the cam cylinder 31 to rotate. The cam groove 311 is an inclined groove on the side wall of the cam cylinder 31. When the linkage cylinder 2 is driven by the screw mechanism 1 to move linearly, the second connecting piece 32 also moves linearly. However, since the second connecting piece 32 passes through the cam groove 311, the second connecting piece 32 also moves in the cam groove 311, and further moves along the axial direction of the cam groove 311. Since the cam groove 311 is an inclined groove, the second connecting piece 32 is limited by the cam groove and rotates along the axial direction of the cam cylinder 31 while moving linearly, so that the cam mechanism 3 converts linear motion into rotary motion. The rotation angle of the cam cylinder 31 is positively correlated with the slope of the cam groove 311 relative to the axial direction of the cam cylinder 31. That is, under the condition that the linkage cylinder 2 moves linearly by the same distance, the greater the slope, the greater the rotation angle of the cam cylinder 31.

[0034] Moreover, the cam mechanism 3 is in a cylindrical structure and is connected to the screw mechanism 1 through the linkage cylinder 2, which can achieve differential purpose and also enable light transmission through the cylindrical structure.

[0035] The screw cam linkage differential 0 provided in the present application converts the rotary motion of the screw mechanism 1 into the linear motion of the linkage cylinder 2, converts the linear motion of the linkage cylinder 2 into the rotary motion of the cam, and realizes that the screw mechanism 1 and the cam mechanism 3 have different rotary speeds, i.e. the differential change of the screw mechanism 1 and the cam mechanism 3. The differential 0 has a small structure, reasonable space occupation, and is more convenient to install. In use, it does not have the vibration problem of the existing planetary gear set structure, has higher transmission precision, and the deviation between the axis of the differential 0 and the axis of light transmission is smaller and more stable.

[0036] Specifically, when the differential 0 is used, a first lens fixedly connected with the driving cylinder 11 is arranged on the threaded mechanism 1, the first lens is located in the driving cylinder 11 and allows light to pass through, a second lens fixedly connected with the cam cylinder 31 is arranged on the cam mechanism 3, the second lens is located in the cam cylinder 31 and allows light to pass through, correspondingly, the first lens rotates with the driving cylinder 11, after a period of time, for example, 1s, the rotation angle of the first lens is α1, which is the same as the rotation angle of the driving cylinder 11, the cam cylinder 31 rotates under the action of the linkage cylinder 2 and the threaded mechanism 1, the second lens rotates with the cam cylinder 31, the rotation angle of the second lens is α2, which is the same as the rotation angle of the cam cylinder 31, the rotation angles of the two are different, so the rotation speeds are also different, light passes through the first lens and the second lens, because the rotation angles of the first lens and the second lens are different, the light transmittance of the differential 0 changes after rotation, compared with before rotation, the user can adjust the differential 0 according to actual needs to change the light transmittance of the differential.

[0037] In some embodiments, the differential 0 further comprises a fixed cylinder 4, the fixed cylinder 4 is sleeved on the periphery of the linkage cylinder 2, and is provided with an axial slot 41 through which and in which the first connecting piece 13 and the second connecting piece 32 move, and the cam cylinder 31 is sleeved on the end of the fixed cylinder 4. The fixed cylinder 4 is used to fix the threaded mechanism 1 and the cam mechanism 3, and is the main body mechanism of the differential 0, and does not affect the transmission of light.

[0038] The driving cylinder 11 of the threaded mechanism 1 rotates relative to the fixed cylinder 4, the moving cylinder 12 moves relative to the fixed cylinder 4, the side wall of the fixed cylinder 4 is provided with the axial slot 41 through which and in which the first connecting piece 13 moves, so that the fixed cylinder 4 does not affect the movement of the first connecting piece 13 to a certain extent, thereby not affecting the movement of the moving cylinder 12, and can also limit the first connecting piece 13 from rotating around its axial direction, so as to ensure the stable work of the threaded mechanism 1. The fixed cylinder 4 can also be provided with a scale line, which facilitates the recording of the rotation angle of the driving cylinder 11 and the movement distance of the moving cylinder 12.

[0039] The cam cylinder 31 of the cam mechanism 3 rotates relative to the fixed cylinder 4, and the fixed cylinder 4 is provided with a scale line, which facilitates the recording of the rotation angle of the cam cylinder 31. In addition, the side wall of the fixed cylinder 4 is provided with the axial slot 41 through which and in which the second connecting piece 32 moves, so that the second connecting piece 32 can only move linearly with the linkage cylinder 2, avoiding the second connecting piece 32 from rotating under the action of the cam groove 311, affecting the rotation of the cam cylinder 31, and ensuring the stable work of the cam mechanism 3.

[0040] In addition, the axial grooves 41 are arranged symmetrically along the axial direction of the fixed cylinder 4, so that the axial grooves 41 can uniformly and stably act on the threaded mechanism 1 and the cam mechanism 3, further ensuring the stable operation of the differential 0.

[0041] In some embodiments, the differential 0 further comprises a first retaining ring 5 and an elastic member 6. The first retaining ring 5 is sleeved on the periphery of the connection between the fixed cylinder 4 and the cam cylinder 31 and is fixedly connected with the fixed cylinder 4. The elastic member 6 is sleeved on the periphery of the fixed cylinder 4, one end of which abuts against the first protrusion 111 at the end of the driving cylinder 11, and the other end is fixedly connected with the second protrusion 42 on the outer surface of the fixed cylinder 4. The first retaining ring 5 is fixedly connected with the fixed cylinder 4 to protect the connection between the cam cylinder 31 and the fixed cylinder 4, ensuring the stable operation of the cam cylinder 31. The elastic member 6 is located on the periphery of the fixed cylinder 4, one end of which abuts against the first protrusion 111 at the end of the driving cylinder 11, and the other end is fixedly connected with the second protrusion 42 on the outer surface of the fixed cylinder 4. This can enable the elastic member 6 to exert elastic buffering action by its own elastic force under the fixation of the fixed cylinder 4, and apply a reverse elastic force to the driving cylinder 11 to prevent the driving cylinder 11 from moving axially when rotating, ensuring the stable operation of the threaded mechanism 1 and further ensuring the stable operation of the differential 0. In addition, the arrangement of the elastic member 6 enables the differential 0 to offset the fitting gap that exists when the driving cylinder 11 and the moving cylinder 12 cooperate, ensuring the operation of the threaded mechanism 1.

[0042] Specifically, the first retaining ring 5 is fixedly connected with the fixed cylinder 4 through thread adaptation, which can realize the detachable replacement of the first retaining ring 5, avoid affecting the normal use of the differential 0 due to damage of the first retaining ring 5, and further prolong the service life of the differential 0.

[0043] In some embodiments, the differential 0 further comprises a guide ball head plunger 7, the ball head end of which abuts against the linkage cylinder 2 through the side wall of the fixed cylinder 4. The guide ball head plunger 7 is fixedly arranged under the action of the fixed cylinder 4, and the abutment of the ball head end of the guide ball head plunger 7 with the linkage cylinder 2 can guide the linkage cylinder 2 to move smoothly along its axial direction when the linkage cylinder 2 moves linearly.

[0044] In some embodiments, the differential 0 further comprises an appearance cylinder 8 sleeved on the periphery of the elastic member 6 and fixedly connected with the fixed cylinder 4. The appearance cylinder 8 is used to limit the elastic member 6, so as to avoid the elastic member 6 from being bounced out of the fixed cylinder 4 when the driving cylinder 11 interacts with each other in the axial direction, and the appearance cylinder 8 can shield the elastic member 6, so that the differential 0 has a smooth appearance.

[0045] Specifically, the appearance cylinder 8 is fixedly connected with the fixed cylinder 4 through threaded connection, so that the appearance cylinder 8 can be replaced, avoiding the use of the differential due to the damage of the appearance cylinder 8, thereby prolonging the service life of the differential 0.

[0046] In some embodiments, the threaded mechanism 1 further comprises a second blocking ring 14 located in the driving cylinder 11 and fixedly connected with the fixed cylinder 4 by sleeving on the periphery of the end of the fixed cylinder 4. The second blocking ring 14 cooperates with the first protrusion 111 at one end of the driving cylinder 11 to limit the axial movement range of the moving cylinder 12. The moving cylinder 12 can move linearly in the axial direction of the driving cylinder 11 under the action of the thread of the driving cylinder 11. The blocking ring and the protrusion at one end of the driving cylinder 11 can limit the linear movement range of the moving cylinder 12, so as to ensure the stable work of the threaded mechanism 1 on the differential 0.

[0047] In some embodiments, the threaded mechanism 1 further comprises a secondary lens barrel 15 located in the driving cylinder 11 and fixedly connected with the driving cylinder 11. The secondary lens barrel 15 rotates with the driving cylinder 11. In use, the lens located in the secondary lens barrel 15 also rotates with the secondary lens barrel 15, thereby realizing the rotation of the lens.

[0048] Specifically, the secondary lens barrel 15 is fixedly connected with the driving cylinder 11 through threaded connection, so that the secondary lens barrel 15 can be replaced, avoiding the influence of the damage of the secondary lens barrel 15 on the normal use of the differential 0, thereby prolonging the service life of the differential 0.

[0049] In addition, the secondary lens barrel 15 is located at the end of the driving cylinder 11 away from the cam mechanism 3, which is convenient for light transmission in optical systems, so that the differential 0 is convenient for users to use.

[0050] In some embodiments, the differential 0 further comprises a gasket 9 located between the elastic member 6 and the driving cylinder 11. The gasket 9 is used to weaken the friction between the elastic member 6 and the driving cylinder 11, thereby prolonging the service life of the driving cylinder 11.

[0051] In some embodiments, the first connecting member 13 and the second connecting member 32 each comprise a copper column and a bolt, the bolt is fixedly connected with the linkage cylinder 2 through the copper column. The bolt plays a role of fixed connection, and the copper column arranged outside the bolt can reduce the friction between the first connecting member 13 and the fixed cylinder 4 and the moving cylinder 12, and reduce the friction between the second connecting member 32 and the fixed cylinder 4 and the cam cylinder 31. Therefore, the copper column can prolong the service life of the fixed cylinder 4, the moving cylinder 12 and the cam cylinder 31, and further prolong the service life of the differential 0.

[0052] In some embodiments, the cam mechanism 3 further comprises a main mirror cylinder 33, which is located in the cam cylinder 31 and fixedly connected with the cam cylinder 31. The main mirror cylinder 33 rotates with the cam cylinder 31, and when rotating, the lens located in the main mirror cylinder 33 also rotates, thereby realizing the rotation of the lens.

[0053] In addition, the main mirror cylinder 33 is located at the end of the cam cylinder 31 away from the screw mechanism 1, which is convenient for light transmission when used in an optical system, so that the differential 0 is convenient for users to use.

[0054] Therefore, the screw cam linkage type differential 0 provided by the present application can be used in an optical system, realizes differential rotation of the main mirror cylinder 33 and the secondary mirror cylinder 15, and because the structure of the differential 0 is a cylindrical structure, the axis deviation of the main mirror cylinder 33 and the secondary mirror cylinder 15 is small, the axis deviation of the screw mechanism 1 and the cam mechanism 3 is also small, and the axis deviation of the differential 0 and the axis of light transmission is also small, thereby making the operation of the differential 0 more stable. In addition, the linkage inside the screw mechanism 1 and the cam mechanism 3 is realized through the thread action and the cam groove 311 action, so that the transmission precision of the differential 0 is higher than that of the existing planetary gear set structure, and the working effect is better.

[0055] It should be understood by those skilled in the art that the above discussion of any of the embodiments is only exemplary and is not intended to limit the scope of the present application (including claims) to these examples; under the idea of the present application, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in detail.

[0056] Embodiments of the application are intended to encompass all such substitutions, modifications and alterations falling within the scope of the appended claims. Accordingly, all such changes available in the art to one with ordinary skill are expressly intended to be embraced within the scope of the present application.

Claims

1. A threaded cam linkage differential characterized in that, The differential mechanism comprises: a thread mechanism, a linkage cylinder and a cam mechanism connected in sequence; the thread mechanism comprises a driving cylinder and a moving cylinder connected by threads, the moving cylinder is fixedly connected with the linkage cylinder through a first connecting member, and the moving cylinder drives the linkage cylinder to move linearly under the action of the rotating threads of the driving cylinder; the cam mechanism comprises a cam cylinder and a second connecting member, the second connecting member is fixed on the linkage cylinder through a cam groove on the cam cylinder, and the second connecting member moves in the cam groove under the linear motion of the linkage cylinder to drive the cam cylinder to rotate; the differential mechanism further comprises a fixed cylinder, a guide ball head plunger, a first retaining ring and an elastic member, the fixed cylinder is sleeved on the periphery of the linkage cylinder and is provided with an axial groove for the first connecting member and the second connecting member to pass through and move, and the cam cylinder is sleeved on the end of the fixed cylinder; the first retaining ring is sleeved on the periphery of the connection between the fixed cylinder and the cam cylinder and is fixedly connected with the fixed cylinder, the elastic member is sleeved on the periphery of the fixed cylinder, one end of the elastic member abuts against a first protrusion at the end of the driving cylinder, and the other end of the elastic member is fixedly connected with a second protrusion on the outer surface of the fixed cylinder; the ball head end of the guide ball head plunger abuts against the linkage cylinder through the side wall of the fixed cylinder.

2. A threaded cam linkage differential as in claim 1, wherein, Further comprising an appearance cylinder sleeved on the periphery of the elastic member, which is fixedly connected with the fixed cylinder.

3. A threaded cam linkage differential as in claim 1, wherein, The thread mechanism further comprises a second retaining ring, the second retaining ring is located in the driving cylinder and is sleeved on the periphery of the end of the fixed cylinder and is fixedly connected with the fixed cylinder, and the second retaining ring and the first protrusion at one end of the driving cylinder jointly limit the axial movement range of the moving cylinder.

4. A threaded cam linkage differential as in claim 1, wherein, The thread mechanism further comprises a secondary lens barrel, which is located in the driving cylinder and is fixedly connected with the driving cylinder.

5. A threaded cam linkage differential as in claim 1, wherein, Further comprising a gasket located between the elastic member and the driving cylinder.

6. A threaded cam linkage differential as in claim 1, wherein, The first connecting member and the second connecting member each comprise a copper column and a bolt, and the bolt is fixedly connected with the linkage cylinder through the copper column.

7. A threaded cam linkage differential as in claim 1, wherein, The cam mechanism further comprises a primary lens barrel, which is located in the cam cylinder and is fixedly connected with the cam cylinder.

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