CN219625787U - Staggered teeth gap eliminating device for cam type zoom focusing system - Google Patents
Staggered teeth gap eliminating device for cam type zoom focusing system Download PDFInfo
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- CN219625787U CN219625787U CN202321229237.8U CN202321229237U CN219625787U CN 219625787 U CN219625787 U CN 219625787U CN 202321229237 U CN202321229237 U CN 202321229237U CN 219625787 U CN219625787 U CN 219625787U
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Abstract
The utility model relates to a staggered teeth gap eliminating device for a cam type zoom focusing system, which comprises a motor, a driving gear and a driven gear. The motor is used for providing power for the forward and backward movement of the lens in the lens frame relative to the lens, and the lens frame is a hollow cylindrical frame body; the driving gear is fixedly arranged at the output end of the motor and is coaxial with the output end of the motor; the driving gear comprises a positive anti-backlash gear and a reverse anti-backlash gear; the driven gear is meshed with the driving gear; the positive anti-backlash gear and the reverse anti-backlash gear are respectively attached to the driven gear in a staggered manner in opposite directions to achieve an engaged state. The device eliminates the gap between the driving gear and the driven gear through the combination of the positive anti-backlash gear and the reverse anti-backlash gear, and can obviously improve the transmission gap elimination between gears and improve the transmission accuracy of gears when being used on a cam cylinder or a thermal imager of a cam shaft type infrared zooming focusing anti-backlash gear transmission mechanism system.
Description
Technical Field
The utility model relates to the field of thermal infrared imager zooming systems, in particular to a staggered tooth gap eliminating device for a cam type zoom focusing system.
Background
The optical system of the domestic and foreign high-precision thermal infrared imagers largely uses cam type zooming optical systems, and the lens frame connected with the cam type zooming optical systems through the driving of the designed cam curve grooves drives the lenses to move back and forth according to the pre-designed curves, so that the requirements of zooming and focusing of the optical systems by combining multiple groups of lenses are met.
Currently, cam type zoom and focus mechanisms are typically implemented by transmission between gears. The gears are meshed too tightly, so that the low-temperature gears are blocked; too loose engagement results in increased gaps, which can lead to errors in the high-precision aiming infrared thermal imager, thereby resulting in reduced sighting precision of the infrared thermal imager, and increased difficulty in servo control, and difficulty in judging whether the position of the encoder is in the backlash gap or the lens is driven to move.
Chinese patent CN102996757a discloses a double gear gap eliminating structure with staggered teeth to adjust torsion spring force, and the pretightening force is generated by a plurality of tension springs, so that the gap is eliminated. However, since the tension spring is hung on the two gears, the two gears must have space allowance left between the tension spring body and the stretched gear, which results in oversized gears, and is difficult to be applied to the transmission of the miniature thin gear of the miniaturized mechanism.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model provides the staggered tooth gap eliminating device for the cam type zoom focusing system, which is used in a miniaturized zoom focusing gear transmission system required by an infrared thermal imager, can obviously improve the elimination effect of transmission gaps between gears, helps to improve the transmission accuracy of the gears, further effectively improves the viewing accuracy of the infrared thermal imager on the cam type zoom focusing system, and simultaneously reduces the difficulty of servo control.
The technical scheme for achieving the aim of the utility model is as follows:
a staggered tooth gap eliminating device for a cam type zoom focusing system comprises a motor, a driving gear and a driven gear.
The motor is used for providing power for the forward and backward movement of the lens in the lens frame relative to the lens, and the lens frame is a hollow cylindrical frame body;
the driving gear is fixedly arranged at the output end of the motor and is coaxial with the output end of the motor; the driving gear comprises a positive anti-backlash gear and a reverse anti-backlash gear;
the driven gear is meshed with the driving gear; the positive anti-backlash gear and the inverse anti-backlash gear are respectively attached to the driven gear in a staggered manner in opposite directions to achieve an engagement state, so that a gap between the driving gear and the driven gear is eliminated through the combination of the positive anti-backlash gear and the inverse anti-backlash gear.
Further, the driven gear is sleeved on the outer surface of the lens frame and is coaxial with the lens frame; the surface of the lens frame is provided with a cam curve groove, and the lens can translate along the cam curve groove; the axial direction of the output end of the motor is parallel to the axial direction of the lens frame; the modulus, the tooth number and the reference circle diameter of the positive anti-backlash gear and the reverse anti-backlash gear are the same.
Further, the inner diameter of the reverse anti-backlash gear is fixedly provided with a mounting shaft sleeve, the mounting shaft sleeve penetrates through two sides of the reverse anti-backlash gear, one side of the mounting shaft sleeve is provided with a locking piece, and the other side of the mounting shaft sleeve is used for mounting the positive anti-backlash gear; the internal diameter of the positive anti-backlash gear is fixedly provided with a sleeve shaft matched with the mounting shaft sleeve, and the positive anti-backlash gear is arranged on the reverse anti-backlash gear through the sleeve shaft and is integrated with the reverse anti-backlash gear set.
Further, the sleeve shaft comprises an elastic part and a fixing part; the fixed part is fixedly connected with the positive clearance eliminating gear; the elastic part comprises a fixed block, a fixed screw, an adjusting screw and a spring; the mounting shaft sleeve is provided with a fixing threaded hole matched with the fixing screw; one end of the fixing part is provided with a through hole, the elastic part is provided with an adjusting threaded hole corresponding to the through hole, the adjusting screw can penetrate through the through hole to be connected with the adjusting threaded hole, and the spring is sleeved on the adjusting screw; the diameter of the spring is larger than that of the through hole, and the spring is arranged and installed between the head of the adjusting screw and the through hole.
Further, a sliding groove is formed in the surface of the lens frame, the sliding groove is parallel to the axial direction of the lens frame, and a rack is arranged in the sliding groove; the outer side of the rack is meshed with the driven gear, and the inner side of the rack is fixedly connected with a lens in the lens frame; the rack can slide in the sliding groove along the sliding groove direction, so that the lens frame can move back and forth relative to the lens; the axial direction of the output end of the motor is vertical to the axial direction of the lens frame; the modulus, the tooth number and the reference circle diameter of the positive anti-backlash gear and the reverse anti-backlash gear are the same.
Further, the driven gear comprises a positive transmission gear and a reverse transmission gear, wherein the positive transmission gear comprises a first positive transmission gear and a second positive transmission gear which are fixedly arranged on the same transmission shaft; the first positive transmission gear is meshed with the positive anti-backlash gear, and the second positive transmission gear is meshed with the rack; the reverse transmission gear comprises a first reverse transmission gear and a second reverse transmission gear which are fixedly arranged on the same transmission shaft; the first inverse transmission gear is meshed with the inverse clearance eliminating gear, and the second inverse transmission gear is meshed with the rack; the modulus, the tooth number and the reference circle diameter of the second positive transmission gear are the same as those of the second inverse transmission gear.
Further, the second positive transmission gear and the second negative transmission gear are respectively attached to the racks in a staggered manner in opposite directions to achieve a meshed state.
Further, the first inverse transmission gear and the inverse clearance eliminating gear are helical gears matched with each other; the first positive transmission gear and the positive clearance eliminating gear are helical gears which are matched with each other.
Further, the reverse anti-backlash gears are diagonally opposite to the gears of the positive anti-backlash gears.
The mechanism of the utility model is as follows:
after the gap eliminating device is added in the zooming system, the positive gap eliminating gear 12 and the negative gap eliminating gear 11 are coaxial and driven by the same motor 3, the driven gear 2 is respectively assembled and meshed with the positive gap eliminating gear 12 and the negative gap eliminating gear 11 in a staggered way in the opposite direction during the installation, and the driving gear 1 and the driven gear 2 can be always kept in full contact in spite of clockwise rotation or anticlockwise rotation during zooming, so that gaps among gears are completely eliminated. The use of the bevel gear can further eliminate the gap between gears, so that zooming is more accurate. The elastic part can ensure sufficient contact and buffer the gear to avoid the damage of the gear by the cooperation of the spring 125 and the adjusting screw 124 when eliminating the gear clearance. Meanwhile, the thrust of the contact point between the gears in the clearance elimination process can be adjusted by the elasticity of the spring 125 according to the torsion of the motor 3 by adjusting the tightness of the adjusting screw 124, so that the gears are further protected.
Compared with the prior art, the utility model has the following advantages:
the utility model improves the original transmission gear, and the two groups of gears respectively contact the driven gear in opposite directions by adding one group of gears, so that the aim of eliminating gaps between gears in transmission is fulfilled; the elastic principle of the small spring is used to ensure further clearance elimination and protect the gear. The device is used on a cam cylinder or a cam shaft type infrared zooming focusing and anti-backlash gear transmission mechanism system thermal imager with high-precision miniaturization requirements, can obviously improve transmission clearance elimination between gears, improve gear transmission accuracy, improve sighting precision of the infrared thermal imager on the cam type zooming focusing system, reduce control difficulty, save space and meet miniaturization requirements.
Drawings
FIG. 1 is a perspective view showing the overall structure of embodiment 1 of the present utility model;
FIG. 2 is a top view showing the overall structure of embodiment 1 of the present utility model;
FIG. 3 is an exploded view of the driving gear structure according to embodiment 1 of the present utility model;
FIG. 4 is a cross-sectional view showing the combination of the positive anti-backlash gears and the reverse anti-backlash gears according to embodiment 1 of the present utility model;
FIG. 5 is a front view showing the overall structure of embodiment 1 of the present utility model;
FIG. 6 is an enlarged view of portion A of FIG. 5;
FIG. 7 is a perspective view showing the overall structure of embodiment 2 of the present utility model;
FIG. 8 is a front view showing the overall structure of embodiment 2 of the present utility model;
fig. 9 is an exploded view showing the structures of a driving gear and a driven gear according to embodiment 2 of the present utility model;
FIG. 10 is a schematic view showing the usage states of the driving gear and the driven gear according to embodiment 2 of the present utility model;
in the figure:
1-driving gear, 11-reverse clearance eliminating gear, 111-locking piece, 112-mounting shaft sleeve, 12-positive clearance eliminating gear, 121-fixing part, 122-fixing block, 123-fixing screw, 124-adjusting screw and 125-spring;
2-driven gear, 21-first reverse gear, 22-second reverse gear, 23-first positive gear, 24-second positive gear;
3-motor, 4-lens frame, 5-lens;
6-racks, 61-sliding grooves.
Detailed Description
Example 1
As shown in fig. 1 to 6, a staggered teeth gap eliminating device for a cam type zoom focusing system comprises a motor 3, a driving gear 1 and a driven gear 2. The motor 3 is used for providing power for the forward and backward movement of the lens 5 in the lens frame 4 relative to the lens, and the lens frame 4 is a hollow cylindrical frame body. The driven gear 2 is sleeved on the outer surface of the lens frame 4 and is coaxial with the lens frame 4; cam curve grooves are formed in the surface of the lens frame 4, the lens 5 is mounted inside the lens frame 4, protrusions are arranged on the edges of the lens 5 and clamped into the cam curve grooves, and the lens 5 can translate relative to the lens frame 4 along the cam curve grooves in the axial direction of the lens frame 4 through rotating the lens frame 4. The axial direction of the output end of the motor 3 is parallel to the axial direction of the lens frame 4. The driving gear 1 is fixedly arranged at the output end of the motor 3 and is coaxial with the output end of the motor 3; the driving gear 1 comprises a positive anti-backlash gear 12 and a negative anti-backlash gear 11 which are fixedly arranged in parallel and can be simultaneously contacted with the driven gear 2. The positive anti-backlash gear 12 and the negative anti-backlash gear 11 are respectively attached to the driven gear 2 in a manner of being offset in opposite directions to achieve an engaged state, so that the backlash between the driving gear 1 and the driven gear 2 is eliminated by the combination of the positive anti-backlash gear 12 and the negative anti-backlash gear 11. The module, the tooth number and the reference circle diameter of the positive anti-backlash gear 12 and the reverse anti-backlash gear 11 are the same.
The inside diameter of the reverse anti-backlash gear 11 is fixedly provided with a mounting shaft sleeve 112, the mounting shaft sleeve 112 penetrates through two sides of the reverse anti-backlash gear 11, one side, close to the motor 3, is provided with a locking piece 111, and the other side is used for mounting the positive anti-backlash gear 12. The locking piece 111 can fix the reverse anti-backlash gear 11 on the output end of the motor 3 through screw fastening. The inner diameter of the positive anti-backlash gear 12 is fixedly provided with a sleeve shaft matched with the mounting shaft sleeve 112, and the positive anti-backlash gear 12 is arranged on the reverse anti-backlash gear 11 through the sleeve shaft to be combined into a whole with the reverse anti-backlash gear 11. The sleeve shaft includes an elastic portion and a fixing portion 121; the fixed part 121 is fixedly connected with the positive anti-backlash gear 12; the elastic part comprises a fixed block 122, a fixed screw 123, an adjusting screw 124 and a spring 125; the mounting shaft sleeve 112 is provided with a fixing threaded hole matched with the fixing screw 123; one end of the fixing portion 121 is provided with a through hole, the elastic portion is provided with an adjusting threaded hole corresponding to the through hole, and the adjusting screw 124 can penetrate through the through hole to be connected with the adjusting threaded hole. The inner wall of the through hole is smooth and the aperture of the through hole is larger than that of the adjusting screw 124, and the inner wall of the through hole is not contacted with the adjusting screw 124. The spring 125 is sleeved on the adjusting screw 124; the diameter of the spring 125 is larger than the aperture of the through hole, and the spring is arranged and installed between the head of the adjusting screw 124 and the through hole.
When the gear is mounted, the positive anti-backlash gear 12 and the negative anti-backlash gear 11 are respectively attached to the driven gear 2 in a meshed state in a staggered manner in opposite directions and fixed. The gap between the driving gear 1 and the driven gear 2 is eliminated. The tightness of the adjusting screw 124 is adjusted according to the torsion of the motor 3, and the gap is further eliminated and the gear is protected by the spring 125. The full contact between the driving gear 1 and the driven gear 2 is always kept no matter the clockwise rotation or the anticlockwise rotation during focal length adjustment, so that the existence of a gap is avoided.
Example 2
As shown in fig. 7-10, compared with the embodiment 1, the structure of the lens frame 4 and the lens 5 in the embodiment 2 is different, the surface of the lens frame 4 is provided with a sliding groove 61, the sliding groove 61 is parallel to the axial direction of the lens frame 4, and a rack 6 is arranged in the sliding groove 61; the outer side of the rack 6 is meshed with the driven gear 2, and the inner side is fixedly connected with the lens 5 in the lens frame 4. The rack 6 can slide in the sliding groove 61 along the sliding groove 61 direction, so that the lens frame 4 can move back and forth relative to the lens 5; the axial direction of the output end of the motor 3 is perpendicular to the axial direction of the lens frame 4; the module, the tooth number and the reference circle diameter of the positive anti-backlash gear 12 and the reverse anti-backlash gear 11 are the same.
The driven gear 2 comprises a positive drive gear and a reverse drive gear, the positive drive gear comprises a first positive drive gear 23 and a second positive drive gear 24, and the two gears are fixedly arranged on the same transmission shaft. The first positive drive gear 23 is meshed with the positive anti-backlash gear 12, and the second positive drive gear 24 is meshed with the rack 6; the reverse drive gear comprises a first reverse drive gear 21 and a second reverse drive gear 22, both of which are fixedly mounted on the other drive shaft. The first inverse transmission gear 21 is meshed with the inverse clearance eliminating gear 11, and the second inverse transmission gear 22 is meshed with the rack 6; the second spur gear 24 has the same modulus, tooth number and pitch diameter as the second counter gear 22. The first inverse transmission gear 21 and the inverse clearance eliminating gear 11 are helical gears matched with each other; the first spur gear 23 and the spur backlash gear 12 are helical gears which are matched with each other. The reverse backlash gear 11 and the gear of the positive backlash gear 12 are obliquely opposite, and the second positive transmission gear 24 and the second reverse transmission gear 22 are respectively attached to the rack 6 in a manner of being offset in opposite directions to achieve an engaged state.
When the gear is mounted, the forward backlash gear 12 and the reverse backlash gear 11 are respectively attached to the first forward transmission gear 23 and the first reverse transmission gear 21 so as to be shifted in opposite directions, and are fixed in an engaged state. At the same time, the second positive transmission gear 24 and the second inverse transmission gear 22 are respectively attached to the teeth on the rack 6 in a mode of being staggered in the opposite directions to reach an engaged state and fixed. Thereby eliminating the gap between the driving gear 1 and the driven gear 2 and the gap between the driven gear 2 and the rack 6. The bevel gear can further eliminate the gap. The full contact between the driving gear 1 and the driven gear 2 is always kept no matter the clockwise rotation or the anticlockwise rotation during focal length adjustment, so that the existence of a gap is avoided.
It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (9)
1. A staggered tooth gap elimination device for a cam type zoom focusing system, comprising:
a motor (3) for providing power for the forward and backward movement of a lens (5) in a lens frame (4) relative to a lens, wherein the lens frame (4) is a hollow cylindrical frame body;
the driving gear (1) is fixedly arranged at the output end of the motor (3) and is coaxial with the output end of the motor (3); the driving gear (1) comprises a positive anti-backlash gear (12) and a reverse anti-backlash gear (11);
a driven gear (2) meshed with the driving gear (1); the positive anti-backlash gear (12) and the negative anti-backlash gear (11) are respectively attached to the driven gear (2) in a mode of being staggered in opposite directions to achieve an engagement state, so that a gap between the driving gear (1) and the driven gear (2) is eliminated through the combination of the positive anti-backlash gear (12) and the negative anti-backlash gear (11).
2. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 1, wherein: the driven gear (2) is sleeved on the outer surface of the lens frame (4) and is coaxial with the lens frame (4); a cam curve groove is formed in the surface of the lens frame (4), and the lens (5) can translate along the cam curve groove; the output end of the motor (3) is axially parallel to the lens frame (4); the modulus, the tooth number and the reference circle diameter of the positive anti-backlash gear (12) and the reverse anti-backlash gear (11) are the same.
3. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 2, wherein: the inner diameter of the reverse anti-backlash gear (11) is fixedly provided with a mounting shaft sleeve (112), the mounting shaft sleeve (112) penetrates through two sides of the reverse anti-backlash gear (11), one side of the mounting shaft sleeve is provided with a locking piece (111), and the other side of the mounting shaft sleeve is used for mounting the positive anti-backlash gear (12); the internal diameter of the positive anti-backlash gear (12) is fixedly provided with a sleeve shaft matched with the mounting shaft sleeve (112), and the positive anti-backlash gear (12) is arranged on the reverse anti-backlash gear (11) through the sleeve shaft to be combined with the reverse anti-backlash gear (11) into a whole.
4. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 3, wherein: the sleeve shaft comprises an elastic part and a fixing part (121); the fixing part (121) is fixedly connected with the positive anti-backlash gear (12); the elastic part comprises a fixed block (122), a fixed screw (123), an adjusting screw (124) and a spring (125); the mounting shaft sleeve (112) is provided with a fixing threaded hole matched with the fixing screw (123); one end of the fixing part (121) is provided with a through hole, the position of the elastic part corresponding to the through hole is provided with an adjusting threaded hole, the adjusting screw (124) can penetrate through the through hole to be connected with the adjusting threaded hole, and the spring (125) is sleeved on the adjusting screw (124); the diameter of the spring (125) is larger than that of the through hole, and the spring is arranged and installed between the head of the adjusting screw (124) and the through hole.
5. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 1, wherein: a sliding groove (61) is formed in the surface of the lens frame (4), the sliding groove (61) is axially parallel to the lens frame (4), and a rack (6) is arranged in the sliding groove (61); the outer side of the rack (6) is meshed with the driven gear (2), and the inner side of the rack is fixedly connected with the lens (5) in the lens frame (4); the rack (6) can slide in the sliding groove (61) along the sliding groove (61) direction, and can enable the lens frame (4) to move back and forth relative to the lens (5); the axial direction of the output end of the motor (3) is perpendicular to the axial direction of the lens frame (4); the modulus, the tooth number and the reference circle diameter of the positive anti-backlash gear (12) and the reverse anti-backlash gear (11) are the same.
6. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 5, wherein: the driven gear (2) comprises a positive transmission gear and a reverse transmission gear, wherein the positive transmission gear comprises a first positive transmission gear (23) and a second positive transmission gear (24), and the first positive transmission gear and the second positive transmission gear are fixedly arranged on the same transmission shaft; the first positive transmission gear (23) is meshed with the positive anti-backlash gear (12), and the second positive transmission gear (24) is meshed with the rack (6); the reverse transmission gear comprises a first reverse transmission gear (21) and a second reverse transmission gear (22), and the first reverse transmission gear and the second reverse transmission gear are fixedly arranged on the same transmission shaft; the first inverse transmission gear (21) is meshed with the inverse anti-backlash gear (11), and the second inverse transmission gear (22) is meshed with the rack (6); the second forward gear (24) has the same modulus, tooth count and pitch diameter as the second reverse gear (22).
7. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 6, wherein: the second forward transmission gear (24) and the second reverse transmission gear (22) are respectively attached to the rack (6) in a staggered manner in opposite directions to achieve an engaged state.
8. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 6, wherein: the first inverse transmission gear (21) and the inverse backlash gear (11) are helical gears which are matched with each other; the first positive transmission gear (23) and the positive clearance eliminating gear (12) are helical gears which are matched with each other.
9. A staggered tooth gap elimination device for a cam type zoom focusing system as recited in claim 8, wherein: the reverse anti-backlash gear (11) is obliquely opposite to the gear of the positive anti-backlash gear (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321229237.8U CN219625787U (en) | 2023-05-19 | 2023-05-19 | Staggered teeth gap eliminating device for cam type zoom focusing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321229237.8U CN219625787U (en) | 2023-05-19 | 2023-05-19 | Staggered teeth gap eliminating device for cam type zoom focusing system |
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| Publication Number | Publication Date |
|---|---|
| CN219625787U true CN219625787U (en) | 2023-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321229237.8U Active CN219625787U (en) | 2023-05-19 | 2023-05-19 | Staggered teeth gap eliminating device for cam type zoom focusing system |
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| CN (1) | CN219625787U (en) |
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2023
- 2023-05-19 CN CN202321229237.8U patent/CN219625787U/en active Active
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