CN107654616B - Helical gear with anti-backlash device - Google Patents
Helical gear with anti-backlash device Download PDFInfo
- Publication number
- CN107654616B CN107654616B CN201710976436.8A CN201710976436A CN107654616B CN 107654616 B CN107654616 B CN 107654616B CN 201710976436 A CN201710976436 A CN 201710976436A CN 107654616 B CN107654616 B CN 107654616B
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- gear
- hole
- disc
- backlash
- adjusting screw
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- 239000013013 elastic material Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 7
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 11
- 230000003287 optical effect Effects 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
- F16H55/18—Special devices for taking up backlash
Abstract
A helical gear with a gap eliminating device consists of a first gear 1, a second gear 2 which are coaxially arranged and a gap eliminating device which is clamped between the first gear and the second gear; the gap eliminating device comprises a gap eliminating disc 3, an adjusting screw 4, a sliding block 5 and a push rod 6; the anti-backlash disc 3 is provided with a shaft hole 32 and a special-shaped hole 33, the disc surface 31 is provided with a concave conical surface 34 which is concave, the cylindrical surface 35 is provided with a light hole 36 along the radial direction, the light hole 36 is communicated with the special-shaped hole 33, the anti-backlash disc 3 is also provided with a blind hole 37, the blind hole 37 is coaxial with the light hole 36, and one end of the blind hole 37 is communicated with the special-shaped hole 33; the adjusting screw 4 is arranged on the light holes 36 and the blind holes 37; the sliding block 5 is arranged in the special-shaped hole 33, and a threaded hole matched with the adjusting screw 4 is arranged on the sliding block 5 and sleeved on the adjusting screw 4; the push rod 6 is made of elastic material and is fixed on the sliding block 5, and the end part of the push rod 6 can slide on the concave conical surface 34. The invention has the advantages of good universality, large backlash eliminating range, convenient adjustment, compact structure, low cost and capability of bearing larger axial force, and can automatically eliminate the backlash caused by the abrasion of gear teeth.
Description
Technical Field
The invention relates to the technical field of gear transmission, in particular to a helical gear with an anti-backlash device capable of eliminating backlash of a helical gear transmission pair.
Background
The gear and the meshing of the gear all have a gear side clearance, and when the gear transmission pair needs to rotate positively and negatively, a certain idle return quantity can be generated, so that the transmission precision is reduced. Therefore, in devices requiring precise transmission, gears that eliminate backlash must be used in order to eliminate backlash. The backlash eliminating helical gear is a common gear capable of eliminating backlash. The patent with the issued publication number of CN205605771U discloses a structure of a clearance-eliminating helical gear, which is technically characterized in that: the device comprises a reverse U-shaped spring which is arranged between a left half gear and a right half gear and can axially separate the left half gear from the right half gear, a backing ring, a sliding column and an adjusting nut, wherein the backing ring is in a circular ring shape and is provided with a concave conical surface, the backing ring is inlaid on the left half gear or the right half gear, the conical surface faces outwards, and the backing ring is coaxial with the left half gear or the right half gear; the profile of the sliding column is a column body with an O-shaped cross section, one end face of the sliding column is provided with a screw rod, two inclined bottom grooves are longitudinally formed in the sliding column, the groove depth of one side of the inclined bottom groove close to the screw rod is shallow, and the groove depth of one side of the inclined bottom groove far away from the screw rod is shallow; the left half gear and the right half gear are provided with O-shaped holes with O-shaped cross sections along the axial direction, and the sliding column is arranged in the O-shaped holes of the left half gear and the right half gear; two end feet of the inverted U-shaped spring are respectively inserted into the inclined bottom grooves of the two sliding columns; the adjusting nut is screwed on the screw rod of the sliding column. The working principle of the clearance eliminating helical gear is as follows: the adjusting nut is screwed, the sliding column is forced to slide along the O-shaped holes of the left half gear and the right half gear towards the direction with the adjusting nut, the bottom surface of the inclined bottom groove jacks up the end feet of the inverted U-shaped spring towards the direction of the notch, the inverted U-shaped spring is elastically deformed and expands outwards along the radial direction of the bevel gear, the inverted U-shaped spring expands outwards to be extruded to the concave conical surface of the backing ring, and the left half gear and the right half gear are pushed to be separated along the axial direction, so that the purpose of eliminating gaps is achieved. The disadvantage of this anti-backlash helical gear is: the axial direction of the clearance-eliminating helical gear must be provided with a space for accommodating the adjusting nut and the overhanging screw rod, so that the clearance-eliminating helical gear cannot be adopted by a transmission system with a compact structure; in addition, the left half gear or the right half gear needs to process grooves embedded with backing rings, and the left half gear and the right half gear are provided with O-shaped holes, so that the processing procedure of the helical gear is increased, and particularly, the processing of two helical bottom grooves on a sliding column is difficult, so that the cost of the gap-eliminating helical gear is high.
Disclosure of Invention
The invention aims to provide a helical gear with an anti-backlash device capable of eliminating the backlash of a helical gear transmission pair, which has universality, does not need to be provided with an additional structure on the helical gear, and can form the anti-backlash helical gear together with two helical gears by being clamped between the two helical gears which are coaxially arranged.
In order to achieve the above purpose, the invention adopts the following technical scheme: the helical gear with the gap eliminating device consists of a first gear, a second gear and the gap eliminating device, wherein the first gear and the second gear are helical gears with the same gear parameters; the gap eliminating device is clamped between the first gear and the second gear and comprises a gap eliminating disc, an adjusting screw, a sliding block and a push rod; the gap eliminating disc is disc-shaped, and the disc surface of the gap eliminating disc is opposite to the end surfaces of the gear A and the gear B; the gap eliminating disc is provided with a shaft hole, and the shaft hole of the gap eliminating disc is coaxial with the shaft hole of the gear; the surface of the anti-backlash disc is provided with a special-shaped hole, the special-shaped hole is a through hole; a concave conical surface is arranged on the disk surface of the anti-backlash disk, and the concave conical surface is concave; the cylindrical surface of the anti-backlash disc is radially provided with a light hole which is a through hole and communicated with the special-shaped hole; the gap eliminating disc is provided with a blind hole, the blind hole is coaxial with the optical hole, one end of the blind hole is communicated with the special-shaped hole, and the other end of the blind hole is closed; the adjusting screw is arranged in the unthreaded hole and the blind hole and can rotate in the unthreaded hole and the blind hole; the sliding block is arranged in the special-shaped hole, a threaded hole matched with the adjusting screw rod is formed in the sliding block, and the sliding block is sleeved on the adjusting screw rod and can move along the axial direction of the adjusting screw rod along with the rotation of the adjusting screw rod; the push rod is made of elastic materials, the push rod is fixed on the sliding block, and the end part of the push rod slides on the concave conical surface of the anti-backlash disc along with the axial movement of the sliding block along the adjusting screw rod.
The clearance eliminating principle of the clearance eliminating device of the helical gear is as follows: the adjusting screw is rotated, so that the sliding block on the adjusting screw moves along the axial direction of the adjusting screw, the push rod fixed on the sliding block also moves along with the sliding block, the end part of the push rod slides on the concave conical surface of the anti-backlash disc, when the sliding block moves towards the direction deviating from the shaft hole of the anti-backlash disc, the end part of the push rod moves towards the high position of the concave conical surface along with the sliding block, and further the first gear and the second gear are pushed to move towards the direction deviating from the anti-backlash disc respectively along the axial direction, and the axial distance between the first gear and the second gear is enlarged, so that the anti-backlash aim is achieved. After the gear side clearance of the helical gear transmission pair is eliminated, the axial distance between the gear A and the gear B can not be further enlarged, and at the moment, the adjusting screw is continuously rotated to enable the sliding block to move towards the direction deviating from the shaft hole of the clearance eliminating disc. When the helical gear is driven by elastic force to slide to the high position of the concave conical surface, the first gear and the second gear are pushed to move further towards the direction deviating from the clearance eliminating disc, and the axial distance between the first gear and the second gear is further enlarged, so that the backlash caused by the abrasion of the gear teeth is automatically eliminated.
In contrast to the patent issued CN205605771U, the method has the following remarkable improvements: (1) the gap eliminating device of the helical gear does not need to be provided with an additional structure on the helical gear, and the gap eliminating device is clamped between two helical gears which are coaxially arranged, and the gap eliminating device of one specification can be suitable for helical gears with different diameters, so that the gap eliminating device has universality and good applicability; (2) both disc surfaces of the anti-backlash disc are provided with concave conical surfaces, so that the anti-backlash range is doubled; (3) the head of the adjusting screw rod is exposed out of the cylindrical surface of the clearance eliminating disc, and the adjusting screw rod can be rotated by inserting a screwdriver from the radial direction, so that the clearance eliminating is convenient to adjust; (4) the axial direction of the helical gear is not provided with an adjusting nut, and a space for extending the screw rod is not required to be reserved, so that the structure is compact; (5) because of the versatility, the structure can be standardized and the production can be batched; (6) the method has no parts which are difficult to process, and has low cost due to mass production.
In addition, the invention has the advantages of the patent with the issued publication number of CN 205605771U: (1) the backlash caused by abrasion of gear teeth can be automatically eliminated; (2) the transmission can bear larger axial force, so that the helix angle of the helical gear can be designed larger; (3) when the cone angle of the concave conical surface of the anti-backlash disc is large to a certain extent, a self-locking effect is generated, in other words, even if a larger axial force is generated during transmission, the gear A and the gear B are pushed to be close together along the axial direction, and a backlash is generated.
As an improvement, the helical gear with the gap eliminating device further comprises a flat key, the end face of the first gear facing the second gear is provided with a cylindrical boss coaxial with the first gear, a gear shaft hole of the second gear is sleeved on the cylindrical boss of the first gear, the second gear is limited to rotate relative to the first gear through the flat key, and a shaft hole of the gap eliminating disc is sleeved on the cylindrical boss.
As an improvement, the helical gear with the gap eliminating device further comprises a thrust spring, the cylindrical boss of the first gear is provided with an annular groove, the thrust spring is spiral and is arranged in the annular groove, the outer diameter of the thrust spring is larger than that of the cylindrical boss, the inner diameter of the thrust spring is smaller than that of the cylindrical boss, one end of the thrust spring is propped against the second gear, and the other end of the thrust spring is propped against the side face of the annular groove. The thrust spring has the function of blocking the second gear from slipping from the cylindrical boss of the first gear, so that the first gear, the second gear and the gap eliminating device clamped between the first gear and the second gear are assembled into a whole; and secondly, by the thrust of a thrust spring, when the sliding block of the gap eliminating device is positioned at a position close to the shaft hole of the gap eliminating disc, the first gear, the gap eliminating device and the second gear are mutually abutted, so that the installation and the disassembly of the helical gear transmission pair are facilitated.
Drawings
The contents expressed in the drawings of the present specification and the marks in the drawings are briefly described as follows:
FIG. 1 is a schematic view of a helical gear having an anti-backlash mechanism;
FIG. 2 is a schematic view of a helical gear with an anti-backlash mechanism, shown in front elevation, illustrating the cut-away position of FIG. 1;
FIG. 3 is a schematic view of the structure of the anti-backlash device;
FIG. 4 is a schematic view of the structure of the anti-backlash device, in front view, showing the cut-away position of FIG. 3 and the cut-away position of FIG. 5;
FIG. 5 is a cross-sectional view of FIG. 4, showing 4 pushers secured to 1 slider;
FIG. 6 is a schematic view of a simplified anti-backlash mechanism in the structure of FIG. 3, with only one disk face of the simplified anti-backlash disk having a concave conical surface;
FIG. 7 is a schematic view of a simplified anti-backlash mechanism in the structure of FIG. 5, with only one disk face of the simplified anti-backlash disk having a concave conical surface; and 2 push rods are fixed on the 1 slide blocks;
FIG. 8 is a schematic structural view of a helical gear with an anti-backlash device, illustrating: when the sliding block moves in the direction deviating from the shaft hole, the end part of the push rod moves from the lower part of the concave conical surface to the upper part of the concave conical surface, so that the gear A and the gear B are pushed to move in the direction deviating from the anti-backlash disc;
FIG. 9 is a front view of a helical gear with an anti-backlash mechanism, without a gear, showing the cut-away position of FIG. 8, illustrating: when the sliding block moves in the direction deviating from the shaft hole, the end part of the push rod moves from the lower part of the concave conical surface to the upper part of the concave conical surface, so that the gear A and the gear B are pushed to move in the direction deviating from the anti-backlash disc;
fig. 10 is a schematic diagram of an improved structure of a helical gear with a backlash eliminating device, wherein a cylindrical boss is arranged on a gear A, a gear B and a backlash eliminating disc are sleeved on the cylindrical boss of the gear A, an annular groove is formed in the cylindrical boss, and a thrust spring is arranged in the annular groove.
The marks in the drawings are: 1-a gear, 11-a cylindrical boss, 12-an annular groove, 2-a gear, 21-a gear shaft hole, 3-a clearance eliminating disc, 31-a disc surface, 32-a shaft hole, 33-a special-shaped hole, 34-a concave conical surface, 35-a cylindrical surface, 36-a unthreaded hole, 37-a blind hole, 4-an adjusting screw, 5-a sliding block, 6-a push rod, 7-a flat key and 8-a thrust spring.
Detailed Description
As shown in fig. 1 and 2, the helical gear with the backlash eliminating device consists of a first gear 1, a second gear 2 and the backlash eliminating device which are coaxially arranged, wherein the first gear 1 and the second gear 2 are helical gears with the same gear parameters, the first gear 1 and the second gear 2 can not rotate relatively between the first gear 1 and the second gear 2 through keys, and the first gear 1 or the second gear 2 can axially move; the gap eliminating device is clamped between the first gear 1 and the second gear 2, the gap eliminating device comprises a gap eliminating disc 3, an adjusting screw 4, a sliding block 5 and a push rod 6; as shown in fig. 1, 2, 3 and 4, the anti-backlash disc 3 is a circular disc, or an oval disc or a polygonal disc, the disc surface 31 of the anti-backlash disc 3 is opposite to the end surfaces of the gear a 1 and the gear b 2, the anti-backlash disc 3 is provided with a shaft hole 32, the shaft hole 32 of the anti-backlash disc 3 is coaxial with the shaft hole 21 of the gear, the shaft hole 32 of the anti-backlash disc 3 is sleeved on the shaft, and the anti-backlash disc 3 is radially positioned so that the anti-backlash disc 3 can only axially slide along the shaft; as shown in fig. 3 and 4, 2 special-shaped holes 33 are formed in the disc surface 31 of the anti-backlash disc 3, the special-shaped holes 33 are through holes, the special-shaped holes 33 are symmetrically arranged, and more than 2 special-shaped holes 33 can be formed in the anti-backlash disc 3; as shown in fig. 3 and 5, a concave conical surface 34 is arranged on both disc surfaces 31 of the anti-backlash disc 3, or a concave conical surface 34 is arranged on one disc surface 31 of the anti-backlash disc 3 (as shown in fig. 6 and 7), as shown in fig. 3 and 4, the concave conical surface 34 is concave, and the concave conical surface 34 is coaxial with the shaft hole 32 of the anti-backlash disc 3; as shown in fig. 3 and 4, 2 optical holes 36 are formed in the cylindrical surface 35 of the anti-backlash disc 3 along the direction perpendicular to the axis of the shaft hole 32, the optical holes 36 are symmetrically arranged, the optical holes 36 are through holes and are communicated with the special-shaped holes 33, more than 2 optical holes 36 can be formed in the anti-backlash disc 3, blind holes 37 with the same number as the optical holes 36 are formed in the anti-backlash disc 3, the blind holes 37 are coaxial with the optical holes 36, one end of each blind hole 37 is communicated with the special-shaped holes 33, and the other end of each blind hole 37 is closed; as shown in fig. 3 and 4, the adjusting screw 4 is arranged in the light hole 36 and the blind hole 37 and can rotate in the light hole 36 and the blind hole 37, the sliding block 5 is arranged in the special-shaped hole 33, a threaded hole matched with the adjusting screw 4 is arranged on the sliding block 5, and the sliding block 5 is sleeved on the adjusting screw 4 and can move along the axial direction of the adjusting screw 4 along with the rotation of the adjusting screw 4; as shown in fig. 3, 4 and 5, the push rods 6 are made of elastic materials, the push rods 6 are fixed on the slide blocks 5, the end parts of the push rods 6 slide on the concave conical surfaces 34 of the anti-backlash discs 3 along with the axial movement of the slide blocks 5 along the adjusting screw 4, 4 push rods 6 fixed on 1 slide block 5 (shown in fig. 3 and 5) can be used, and 2 push rods 6 fixed on 1 slide block 5 can be used (shown in fig. 6 and 7).
As an improvement, as shown in fig. 10, the helical gear with the backlash eliminating device of the invention further comprises a flat key 7, the end face of the first gear 1 facing the second gear 2 is provided with a cylindrical boss 11 coaxial with the first gear 1, a gear shaft hole 21 of the second gear 2 is sleeved on the cylindrical boss 11 of the first gear 1, the second gear 2 can slide on the cylindrical boss 11 along the axial direction, the rotation of the second gear 2 relative to the first gear 1 is limited by the flat key 7, and a shaft hole 32 of the backlash eliminating disc 3 is sleeved on the cylindrical boss 11, and the backlash eliminating disc 3 can slide on the cylindrical boss 11 along the axial direction.
As an improvement, as shown in fig. 10, the helical gear with the gap eliminating device of the invention further comprises a thrust spring 8, the cylindrical boss 11 of the gear wheel 1 is provided with an annular groove 12, the thrust spring 8 is spiral, the thrust spring 8 is installed in the annular groove 12, the outer diameter of the thrust spring 8 is larger than the outer diameter of the cylindrical boss 11, the inner diameter of the thrust spring 8 is smaller than the outer diameter of the cylindrical boss 11, and one end of the thrust spring 8 is propped against the gear wheel 2 and the other end is propped against the side face of the annular groove 12.
Claims (3)
1. The helical gear with the gap eliminating device consists of a first gear (1), a second gear (2) and the gap eliminating device which are coaxially arranged, wherein the first gear (1) and the second gear (2) are helical cylindrical gears with the same gear parameters; the method is characterized in that: the gap eliminating device is clamped between the first gear (1) and the second gear (2) and comprises a gap eliminating disc (3), an adjusting screw (4), a sliding block (5) and a push rod (6); the anti-backlash disc (3) is disc-shaped, and the disc surface (31) of the anti-backlash disc (3) is opposite to the end surfaces of the first gear (1) and the second gear (2); the gap eliminating disc (3) is provided with a shaft hole (32), and the shaft hole (32) of the gap eliminating disc (3) is coaxial with the gear shaft hole (21); a special-shaped hole (33) is formed in the disc surface (31) of the anti-backlash disc (3), and the special-shaped hole (33) is a through hole; a concave conical surface (34) is arranged on the disc surface (31) of the anti-backlash disc (3), and the concave conical surface (34) is concave; a light hole (36) is formed on the cylindrical surface (35) of the anti-backlash disc (3) along the radial direction, and the light hole (36) is a through hole and is communicated with the special-shaped hole (33); a blind hole (37) is arranged on the anti-backlash disc (3), the blind hole (37) is coaxial with the light hole (36), one end of the blind hole (37) is communicated with the special-shaped hole (33), and the other end of the blind hole (37) is closed; the adjusting screw (4) is arranged in the unthreaded hole (36) and the blind hole (37) and can rotate in the unthreaded hole (36) and the blind hole (37); the sliding block (5) is arranged in the special-shaped hole (33), a threaded hole matched with the adjusting screw (4) is formed in the sliding block (5), and the sliding block (5) is sleeved on the adjusting screw (4) and can move along the axial direction of the adjusting screw (4) along with the rotation of the adjusting screw (4); the push rod (6) is made of elastic materials, the push rod (6) is fixed on the sliding block (5), and the end part of the push rod (6) slides on the concave conical surface (34) of the anti-backlash disc (3) along with the axial movement of the sliding block (5) along the adjusting screw (4).
2. The helical gear with anti-backlash device of claim 1, wherein: still include flush key (7), gear shaft hole (21) suit of gear (2) is on the cylindrical boss (11) of gear (1) on the terminal surface towards gear (2) of second set, gear (2) set up with gear (1) on cylindrical boss (11) to restrict gear (2) rotation for gear (1) through flush key (7), the shaft hole (32) suit of eliminating clearance dish (3) is on cylindrical boss (11).
3. The helical gear with backlash mechanism according to claim 2, the method is characterized in that: still include thrust spring (8), it has ring channel (12) to open on cylindrical boss (11) of first gear (1), thrust spring (8) are spiral, and thrust spring (8) are adorned in ring channel (12), and the external diameter of thrust spring (8) is greater than the external diameter of cylindrical boss (11), and the internal diameter of thrust spring (8) is less than the external diameter of cylindrical boss (11), and the side of thrust spring (8) one end top second gear (2) and the other end top ring channel (12).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710976436.8A CN107654616B (en) | 2017-10-19 | 2017-10-19 | Helical gear with anti-backlash device |
| PCT/CN2018/000150 WO2019075930A1 (en) | 2017-10-19 | 2018-04-23 | Helical gear having gap-eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710976436.8A CN107654616B (en) | 2017-10-19 | 2017-10-19 | Helical gear with anti-backlash device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107654616A CN107654616A (en) | 2018-02-02 |
| CN107654616B true CN107654616B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710976436.8A Active CN107654616B (en) | 2017-10-19 | 2017-10-19 | Helical gear with anti-backlash device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107654616B (en) |
| WO (1) | WO2019075930A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107654616B (en) * | 2017-10-19 | 2024-02-02 | 常州机电职业技术学院 | Helical gear with anti-backlash device |
| CN108317234B (en) * | 2018-04-12 | 2023-08-04 | 常州机电职业技术学院 | Straight tooth cylindrical gear with anti-backlash function |
| CN109282026A (en) * | 2018-10-23 | 2019-01-29 | 常州机电职业技术学院 | Bevel Gear Transmission gap backlash eliminating equipment |
| CN110725920B (en) * | 2019-10-21 | 2023-03-14 | 南通旺鑫新材料有限公司 | Helical gear with anti-backlash device |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019075930A1 (en) | 2019-04-25 |
| CN107654616A (en) | 2018-02-02 |
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