Worm and wheel anti-backlash mechanism

Abstract

The utility model discloses a worm gear anti-backlash mechanism, include: rotary table base, first bearing seat, left worm, first needle bearing, first thrust bearing, right worm, second thrust bearing, second needle bearing, expansion sleeve, second bearing seat and worm wheel, gear on left worm and right worm and gear on worm wheel interlock. The utility model discloses worm wheel design into double section type, and the gear gap is easier to adjust, and the worm wheel contact tooth number of double section type can be more than one time, and, the worm wheel tooth contact area of double section type worm wheel is about 5 times of double lead worm wheel contact area, therefore the tooth surface wear rate is lower than double lead worm wear rate, and the precision retention is good, because the worm wheel tooth contact area of double section type worm wheel is big, and the stress surface is cambered surface, its driving force disperses, and the friction between worm wheel and worm is reduced, and worm wheel and worm heat reduction is reduced, and the worm wheel segmentation precision is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical equipment technology, specifically relating to a worm gear backlash elimination mechanism. Background Technology

[0002] Worm gear structures are often used to transmit motion and power between two intersecting shafts. The worm wheel and worm are equivalent to a gear and a rack in their middle plane. The worm is also similar in shape to a screw. Therefore, worm gear and worm mechanism are suitable for occasions where the two shafts are intersecting, the transmission ratio is large, the transmission power is not large, or the work is intermittent. They often need to be used in conjunction with a worm gear backlash elimination structure.

[0003] There are two existing backlash elimination structures for worm gears: the double-lead worm gear backlash elimination structure and the double-worm gear backlash elimination structure. These structures utilize a pre-designed clearance to compensate for the backlash between the worm wheel and the worm, thereby improving the accuracy and efficiency of the transmission system. However, they cannot correct for changes in the backlash between the worm wheel and the worm in real time, leading to a problem where the backlash continuously increases with wear during long-term operation of the worm gear. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the shortcomings of the existing technology, this utility model provides a worm gear backlash elimination mechanism, which improves the segmentation accuracy of the rotary worktable, has a simple and reliable structure, is easy to install, and ensures that the worktable is stable and reliable during rotation.

[0005] Technical solution: A worm gear backlash elimination mechanism, comprising: a turntable base, a first bearing housing, a left worm, a first needle roller bearing, a first thrust bearing, a right worm, a second thrust bearing, a second needle roller bearing, a shrink sleeve, a second bearing housing, and a worm gear;

[0006] A worm gear is fixedly installed on the turntable base, and a first bearing seat and a second bearing seat are respectively installed on both sides of the turntable base.

[0007] A first needle roller bearing and a first thrust bearing are fixedly installed on the first bearing housing, and a left worm gear is fixedly installed on the first needle roller bearing and the first thrust bearing.

[0008] A second thrust bearing and a second needle roller bearing are fixedly installed on the second bearing housing, and a right worm gear is fixedly installed on the second thrust bearing and the second needle roller bearing.

[0009] The expansion sleeve expands the right worm gear onto the left worm gear, and the gears on the left and right worm gears mesh with the gears on the worm wheel.

[0010] As an optimization: the clearance between the gears on the left and right worms and the gears on the worm wheel is 0.005-0.008 mm.

[0011] Beneficial effects: The worm gear of this utility model is designed as a double-section type, making backlash easier to adjust; the double-section worm gear can have twice the number of contact teeth, and the contact area of ​​the double-section worm gear teeth is approximately 5 times that of the double-lead worm gear teeth, thus the tooth surface wear rate is lower than that of the double-lead worm gear, resulting in better accuracy retention; because the double-section worm gear teeth have a large inner area and the force-bearing surface is an arc surface, the driving force is dispersed, the friction between the worm gears is reduced, the heat generation of the worm gears is reduced, and the segmentation accuracy of the worm gears is improved. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the gear contact structure between the worm wheel and the worm of this utility model;

[0014] Figure 3 This is a schematic diagram of the backlash adjustment direction structure of this utility model. Detailed Implementation

[0015] Example

[0016] like Figure 1-3 As shown, a worm gear backlash elimination mechanism includes: a turntable base 1, a first bearing seat 2, a left worm 3, a first needle roller bearing 4, a first thrust bearing 5, a right worm 6, a second thrust bearing 7, a second needle roller bearing 8, a shrink sleeve 9, a second bearing seat 10, and a worm gear 11.

[0017] A worm gear 11 is fixedly installed on the turntable base 1. A first bearing seat 2 and a second bearing seat 10 are respectively installed on both sides of the turntable base 1. A first needle roller bearing 4 and a first thrust bearing 5 are fixedly installed on the first bearing seat 2. A left worm 3 is fixedly installed on the first needle roller bearing 4 and the first thrust bearing 5. A second thrust bearing 7 and a second needle roller bearing 8 are fixedly installed on the second bearing seat 10. A right worm 6 is fixedly installed on the second thrust bearing 7 and the second needle roller bearing 8. The expansion sleeve 9 expands the right worm 6 onto the left worm 3. The gears on the left worm 3 and the right worm 6 mesh with the gears on the worm gear 11.

[0018] In this embodiment, the worm gear backlash elimination mechanism is installed by first fixing the worm gear 11 into the turntable base 1; then, the left worm 3 is installed into one side of the turntable base 1, and the right worm 6 is installed into the turntable base 1 from the other side; next, the two bearing seats, the first bearing seat 2 and the second bearing seat 10, and the two bearings, the first thrust bearing 5 and the second thrust bearing 7, are installed and locked from both sides of the turntable base 1; finally, by rotating the two worms relative to each other, the worm gear backlash is adjusted to 0.005-0.008mm, the expansion sleeve 9 is installed, and the right worm 6 is expanded and tightened onto the left worm 3, thus completing the installation.

[0019] The worm gear of this invention is designed as a double-section type, making backlash easier to adjust. The double-section worm gear has twice the number of contact teeth, and the contact area of ​​the double-section worm gear teeth is approximately five times that of the double-lead worm gear teeth. Therefore, the tooth surface wear rate is lower than that of the double-lead worm gear, resulting in better accuracy retention. Because the double-section worm gear teeth have a large inner area and the force-bearing surface is curved, the driving force is dispersed, reducing friction between the worm gears and reducing heat generation, thus improving the segmentation accuracy of the worm gears.

[0020] The foregoing description clearly and completely illustrates the technical solutions in the embodiments of this utility model, enabling those skilled in the art to better understand the advantages and features of this utility model, thereby providing a clearer definition of the scope of protection of this utility model. The embodiments described in this utility model are merely some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

Claims

1. A worm gear backlash elimination mechanism, characterized in that: include: Turntable base (1), first bearing seat (2), left worm (3), first needle roller bearing (4), first thrust bearing (5), right worm (6), second thrust bearing (7), second needle roller bearing (8), shrink sleeve (9), second bearing seat (10) and worm wheel (11); A worm gear (11) is fixedly installed on the turntable base (1), and a first bearing seat (2) and a second bearing seat (10) are respectively installed on both sides of the turntable base (1). The first bearing housing (2) is fixedly mounted with a first needle roller bearing (4) and a first thrust bearing (5), and a left worm gear (3) is fixedly mounted on the first needle roller bearing (4) and the first thrust bearing (5). A second thrust bearing (7) and a second needle roller bearing (8) are fixedly installed on the second bearing housing (10), and a right worm gear (6) is fixedly installed on the second thrust bearing (7) and the second needle roller bearing (8). The expansion sleeve (9) expands the right worm (6) onto the left worm (3), and the gears on the left worm (3) and the right worm (6) mesh with the gears on the worm wheel (11).

2. The worm gear backlash elimination mechanism according to claim 1, characterized in that: The clearance between the gears on the left worm (3) and right worm (6) and the gears on the worm wheel (11) is 0.005-0.008 mm.

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