CN212745003U - Gear clearance eliminating mechanism and transmission device - Google Patents
Gear clearance eliminating mechanism and transmission device Download PDFInfo
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- CN212745003U CN212745003U CN202021057355.1U CN202021057355U CN212745003U CN 212745003 U CN212745003 U CN 212745003U CN 202021057355 U CN202021057355 U CN 202021057355U CN 212745003 U CN212745003 U CN 212745003U
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Abstract
The utility model discloses a gear clearance elimination mechanism and transmission through set up first gear in the pivot, has still set up with first gear engagement's second gear, the flank of tooth of first gear and second gear sets up for the slope to promote the pivot by the elastic component so that the flank of tooth of first gear paste tightly with the flank of tooth of second gear. In the running process of the gear backlash eliminating mechanism, the tooth surface is gradually worn, the elastic force of the elastic part pushes the worn first gear to the worn second gear, so that the tooth surface of the first gear and the tooth surface of the second gear are always kept close to each other, the automatic adjusting function is realized, and the problem that the existing gear backlash eliminating mechanism cannot be automatically adjusted is solved.
Description
Technical Field
The utility model belongs to the technical field of gear drive, especially, relate to a gear crack mechanism and transmission eliminate.
Background
In a precise servo gear transmission system with a forward and reverse rotation requirement, a gap between gears meshed with each other affects the positioning of the servo system, so that the positioning is inaccurate. There is therefore a need in precision servo gear systems to try to eliminate the backlash of the gear system.
There are two existing solutions:
the first one is fixed double-plate gap eliminating structure, and two gears are separated with spacer and regulated in thickness to make the gear surfaces of the gears and gear surface contact closely to the two surfaces of the gear slot. The transmission device has the characteristics that the transmission device can bear and transmit larger torque and energy, but cannot adapt to transmission change and cannot automatically adjust, and if the transmitted gears are abraded or screws are loosened, the transmission precision cannot be well guaranteed.
The second is a double-gear spring backlash eliminating mechanism, two gears are connected by a spring, and under the action of the spring, two sides of the two gears are respectively contacted with two side surfaces of the engaged gears, so that the gapless transmission is realized. The double-gear spring backlash eliminating mechanism is limited by the structure, the elasticity of the spring is small, the meshing acting force cannot be overcome, and the double-gear spring backlash eliminating mechanism is not suitable for gear transmission with large load.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a gear crack mechanism and transmission that disappears to solve the unable automatically regulated's of current gear crack mechanism that disappears problem.
In order to solve the above problem, the technical scheme of the utility model is that:
the utility model discloses a gear crack mechanism that disappears, include:
a rotating shaft rotatably connected to an external device;
the first gear is arranged on the rotating shaft; the tooth surface of the first gear is inclined to the axis of the first gear; the two end surfaces of the first gear are respectively a first end surface and a second end surface, and the reference circle diameter of the first gear at the first end surface is larger than that at the second end surface;
a second gear meshed with the first gear, wherein the axial position of the second gear is fixed on the external device; the tooth surface of the second gear is inclined to the axis of the second gear; the two end surfaces of the second gear are respectively a third end surface and a fourth end surface, and the diameter of a reference circle of the second gear at the third end surface is larger than that at the fourth end surface; in the engaged state, the first end surface and the fourth end surface are located on the same side, and the second end surface and the third end surface are located on the same side;
and the first end of the elastic piece is arranged on the external device, and the second end of the elastic piece is connected with the rotating shaft and used for providing axial force in the direction of the rotating shaft, wherein the first end face faces the second end face.
The gear backlash eliminating mechanism of the utility model also comprises a first bearing and a second bearing; the inner rings of the first bearing and the second bearing are respectively arranged at two ends of the rotating shaft, and the outer rings of the first bearing and the second bearing are respectively arranged on the external device.
The utility model discloses a gear crack mechanism that disappears, first bearing with the second bearing is cylindrical roller bearing.
The gear backlash eliminating mechanism of the utility model also comprises a third bearing; the inner ring of the third bearing is arranged at one end, close to the elastic part, of the rotating shaft, and the outer ring of the third bearing is connected with the second end of the elastic part and used for transmitting the elastic force of the elastic part to the rotating shaft.
The utility model discloses a gear crack mechanism that disappears, the third bearing is thrust bearing.
The gear backlash eliminating mechanism of the utility model also comprises an end cover; the end cover corresponds to the elastic piece and is in threaded connection with the external device, and the first end of the elastic piece is fixedly connected with the end cover.
The utility model discloses a gear crack mechanism that disappears, the elastic component is belleville spring group or linear spring or rectangle spring.
The utility model discloses a gear backlash mechanism, first gear with the profile of tooth of second gear is straight-tooth or skewed tooth.
The utility model discloses a gear anti-backlash mechanism, the tooth thickness of first gear is greater than or is less than the tooth thickness of second gear.
The utility model discloses a transmission device, including above-mentioned arbitrary one the gear crack mechanism that disappears.
The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:
1. the utility model discloses an in the embodiment, set up first gear in the pivot, still set up the second gear with first gear engagement, the flank of tooth of first gear and second gear sets up for the slope to promote the pivot by the elastic component so that the flank of tooth of first gear paste tightly with the flank of tooth of second gear. In the running process of the gear backlash eliminating mechanism, the tooth surface is gradually worn, the elastic force of the elastic part pushes the worn first gear to the worn second gear, so that the tooth surface of the first gear and the tooth surface of the second gear are always kept close to each other, the automatic adjusting function is realized, and the problem that the existing gear backlash eliminating mechanism cannot be automatically adjusted is solved.
2. In the embodiment of the utility model, the first bearing and the second bearing are arranged at the two ends of the rotating shaft to offset the radial force caused by the meshing of the gear part, and the third bearing of the thrust bearing is arranged between the elastic part and the rotating shaft, so that firstly, the elastic force is transmitted through the thrust bearing, and the serious abrasion caused by the direct contact between the elastic part and the rotating shaft is avoided; secondly, the radial force on the rotating shaft is offset through the arrangement of the first bearing and the second bearing, and the problem that the thrust bearing can only bear the axial force and cannot bear the radial force is solved.
3. The utility model discloses an embodiment is through having set up threaded connection in external device's end cover between elastic component and external device for the screw in degree of the size accessible end cover of the elastic force that the elastic component counter shaft produced is adjusted, makes and keeps suitable contact force between first gear and the second gear.
Drawings
Fig. 1 is a schematic view of the gear backlash eliminating mechanism of the present invention.
Description of reference numerals: 1: a first gear; 2: a second gear; 3: a first bearing; 4: a second bearing; 5: a third bearing; 6: an elastic member; 7: an end cap; 8: a rotating shaft.
Detailed Description
The gear backlash eliminating mechanism and the transmission device provided by the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.
Example one
Referring to fig. 1, in one embodiment, a gear backlash elimination mechanism includes a rotating shaft 8, a first gear 1, a second gear 2, and an elastic member 6.
The rotating shaft 8 is rotatably connected to an external device.
The first gear 1 is arranged on the rotating shaft 8. The tooth surface of the first gear 1 is inclined to the axis of the first gear 1. The two end surfaces of the first gear 1 are respectively a first end surface and a second end surface, and the reference circle diameter of the first gear 1 at the first end surface is larger than that at the second end surface.
The second gear 2 is meshed with the first gear 1, and the axial position of the second gear 2 is fixed to an external device. The tooth surface of the second gear 2 is inclined to the axis of the second gear 2. Two end faces of the second gear 2 are respectively a third end face and a fourth end face, and the reference circle diameter of the second gear 2 at the third end face is larger than that at the fourth end face. In the engaged state, the first end face and the fourth end face are located on the same side, and the second end face and the third end face are located on the same side.
The first end of the elastic element 6 is arranged on an external device, and the second end is attached to the rotating shaft 8 and used for providing axial force to the rotating shaft 8, wherein the axial force is in the direction of the first end face towards the second end face.
By arranging the first gear 1 on the rotating shaft 8 and arranging the second gear 2 meshed with the first gear 1, the tooth surfaces of the first gear 1 and the second gear 2 are arranged obliquely, and the rotating shaft 8 is pushed by the elastic piece 6 to enable the tooth surface of the first gear 1 to be tightly attached to the tooth surface of the second gear 2. In the running process of the gear backlash eliminating mechanism, the tooth surface is gradually worn, the elastic force of the elastic part 6 pushes the worn first gear 1 to the worn second gear 2, so that the tooth surface of the first gear 1 and the tooth surface of the second gear 2 are always kept close to each other, the automatic adjustment function is realized, and the problem that the existing gear backlash eliminating mechanism cannot be automatically adjusted is solved.
The structure of the gear backlash eliminating mechanism of the present embodiment is specifically described below:
in the present embodiment, the first gear 1 and the second gear 2 are both bevel gears with a certain taper. When meshing, the axis of the first gear 1 is parallel to the axis of the second gear 2, and the large end of the first gear 1 and the small end of the second gear 2 are positioned on the same side. The elastic force transmitted from the elastic member 6 of the first gear 1 presses the inclined tooth surface against the tooth surface of the second gear 2. The taper of the bevel gear can be calculated according to the required bearing force and pressing force. Of course, the axes of the two gears are not necessarily perpendicular, and are not particularly limited.
The rotating shaft 8 connected with the first gear 1 can be a stepped shaft, and the stepped shaft and the first gear 1 can be in key connection or can be a gear shaft directly made into a whole.
The two ends of the stepped shaft are respectively provided with a first bearing 3 and a second bearing 4. The inner rings of the first bearing 3 and the second bearing 4 are respectively arranged on the rotating shaft 8, and the outer rings of the first bearing 3 and the second bearing 4 are respectively arranged on an external device. The external device can be a bearing seat or a transmission device. Specifically, the first bearing 3 and the second bearing 4 may be cylindrical roller bearings to realize the rotational connection between the stepped shaft and the external device, and at the same time, may bear the radial impact caused by the operation of the gear.
The elastic member 6 may be disposed in various ways. It can be a combination of an elastic element and a wear-resistant material part, which is connected with one end of the rotating shaft 8 by the wear-resistant material, and the elastic part 6 is arranged between the wear-resistant material and an external device to provide elastic force. The wear-resistant material can be polytetrafluoroethylene or carbon-based composite material or silicon carbide or nylon composite material. The materials have small friction coefficient (0.01-0.1), large service temperature span (-196 ℃ -260 ℃), self-lubricating capacity, wear resistance and high flexibility, and can provide corresponding elastic force when generating relative friction with the rotating shaft 8, thereby ensuring the stable operation of the gear backlash elimination mechanism. The elastic piece 6 and the thrust bearing can be arranged, the thrust bearing is the third bearing 5 described above, the thrust bearing is arranged at the small-diameter end of the stepped shaft, meanwhile, the inner ring side wall of the thrust bearing is attached to the stepped side face of the stepped shaft, the elastic piece 6 is arranged between the outer ring of the thrust bearing and an external device, and the elastic force of the elastic piece 6 is transmitted to the stepped shaft through the thrust bearing.
The first bearing 3 and the second bearing 4 are arranged at two ends of the rotating shaft 8 to counteract radial force caused by meshing of gear parts, and the third bearing 5 of the thrust bearing is arranged between the elastic part 6 and the rotating shaft 8, so that firstly, the elastic force is transmitted through the thrust bearing, and serious abrasion caused by direct contact of the elastic part 6 and the rotating shaft 8 is avoided; secondly, the radial force on the rotating shaft 8 is offset through the arrangement of the first bearing 3 and the second bearing 4, and the problem that the thrust bearing can only bear the axial force and cannot bear the radial force is solved.
The elastic member 6 may be embodied as a disc spring set or a linear spring or a rectangular spring. In other embodiments, the specific form of the elastic member 6 may be selected according to the required magnitude of the elastic force, and is not particularly limited herein.
An end cap 7 may also be provided between the resilient member 6 and the external device, the end cap 7 being attached to the external device by a threaded connection, the resilient member 6 being attached to the end cap 7. This kind of setting mode makes elastic component 6 adjustable to the elastic force size of step shaft, and end cover 7 through rotating threaded connection for end cover 7 produces the change for the relative distance between the step shaft, makes elastic component 6 of connecting between end cover 7 and the step shaft compressed or tensile, can be through the deformation degree of control elastic component 6, and then increase or reduce elastic component 6's elastic force size.
In practical implementation, the tooth profile of the first gear 1 and the second gear 2 is straight tooth or helical tooth, and the specific form can be determined according to the torque magnitude required to be transmitted and the like.
Meanwhile, the tooth thickness of the first gear 1 should be greater or less than that of the second gear 2. The gear surfaces of the two gears with small tooth thickness are approved to be completely meshed with the gear with large tooth thickness after axial displacement. Of course, it is also possible that the tooth thickness is the same, except that the meshing portions of the two gears will decrease after wear, which in the case of severe wear may lead to failure of the gears.
Example two
A transmission device comprises the gear backlash eliminating mechanism in the embodiment.
In the running process of the gear backlash eliminating mechanism, the tooth surface is gradually worn, the elastic force of the elastic part 6 pushes the worn first gear 1 to the worn second gear 2, so that the tooth surface of the first gear 1 and the tooth surface of the second gear 2 are always kept close to each other, the automatic adjustment function is realized, the transmission precision of a transmission device applying the gear backlash eliminating mechanism can be always kept, and the problem of precision reduction caused by wear after the transmission device runs for a certain time is solved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Claims (10)
1. A gear backlash elimination mechanism, comprising:
a rotating shaft rotatably connected to an external device;
the first gear is arranged on the rotating shaft; the tooth surface of the first gear is inclined to the axis of the first gear; the two end surfaces of the first gear are respectively a first end surface and a second end surface, and the reference circle diameter of the first gear at the first end surface is larger than that at the second end surface;
a second gear meshed with the first gear, wherein the axial position of the second gear is fixed on the external device; the tooth surface of the second gear is inclined to the axis of the second gear; the two end surfaces of the second gear are respectively a third end surface and a fourth end surface, and the diameter of a reference circle of the second gear at the third end surface is larger than that at the fourth end surface; in the engaged state, the first end surface and the fourth end surface are located on the same side, and the second end surface and the third end surface are located on the same side;
and the first end of the elastic piece is arranged on the external device, and the second end of the elastic piece is connected with the rotating shaft and used for providing axial force in the direction of the rotating shaft, wherein the first end face faces the second end face.
2. The gear backlash mechanism of claim 1 further comprising a first bearing and a second bearing; the inner rings of the first bearing and the second bearing are respectively arranged at two ends of the rotating shaft, and the outer rings of the first bearing and the second bearing are respectively arranged on the external device.
3. The gear backlash mechanism of claim 2 wherein said first bearing and said second bearing are cylindrical roller bearings.
4. The gear backlash mechanism of claim 1, further comprising a third bearing; the inner ring of the third bearing is arranged at one end, close to the elastic part, of the rotating shaft, and the outer ring of the third bearing is connected with the second end of the elastic part and used for transmitting the elastic force of the elastic part to the rotating shaft.
5. The gear backlash mechanism of claim 4 wherein said third bearing is a thrust bearing.
6. The gear backlash mechanism of claim 1, further comprising an end cap; the end cover corresponds to the elastic member and is in threaded connection with the external device, and the first end of the elastic member is connected with the end cover.
7. The gear backlash mechanism of claim 1 wherein said resilient member is a disc spring stack or a linear spring or a rectangular spring.
8. The gear backlash mechanism of claim 1 wherein said first gear and said second gear have straight or helical tooth profiles.
9. The gear backlash mechanism of claim 1 wherein a tooth thickness of said first gear is greater than or less than a tooth thickness of said second gear.
10. A transmission comprising a gear backlash mechanism as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021057355.1U CN212745003U (en) | 2020-06-10 | 2020-06-10 | Gear clearance eliminating mechanism and transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021057355.1U CN212745003U (en) | 2020-06-10 | 2020-06-10 | Gear clearance eliminating mechanism and transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212745003U true CN212745003U (en) | 2021-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021057355.1U Active CN212745003U (en) | 2020-06-10 | 2020-06-10 | Gear clearance eliminating mechanism and transmission device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212745003U (en) |
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2020
- 2020-06-10 CN CN202021057355.1U patent/CN212745003U/en active Active
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