WO2019075930A1

WO2019075930A1 - Helical gear having gap-eliminating device

Info

Publication number: WO2019075930A1
Application number: PCT/CN2018/000150
Authority: WO
Inventors: 高志坚
Original assignee: 常州机电职业技术学院
Priority date: 2017-10-19
Filing date: 2018-04-23
Publication date: 2019-04-25
Also published as: CN107654616B; CN107654616A

Abstract

A helical gear having a gap-eliminating device, consisting of a first gear (1) and a second gear (2) which are coaxially mounted, and a gap-eliminating device clamped therebetween, wherein the gap eliminating device comprises a gap-eliminating disc (3), adjusting screw rods (4), a slide block (5) and a push rod (6); the gap eliminating disc (3) is provided with a shaft hole (32) and a special-shaped hole (33) thereon; an inwardly-formed concave conical surface (34) is arranged on a disc surface (31); an optical hole (36) is radially formed on a cylindrical surface (35) and communicates with the special-shaped hole (33); a blind hole (37) is formed on the gap-eliminating disc (3) and is coaxial to the optical hole 36; one end of the blind hole 37 communicates with the special-shaped hole 33; the adjusting screw rods (4) are mounted in the optical hole (36) and the blind hole 37; the slide block (5) is disposed in the special-shaped hole (33); thread holes which match the adjusting screw rods (4) are formed in the slide block (5) and are sleeved on the adjusting screw rods (4); the push rod (6) is made of an elastic material and is fixed onto the slide block (5); and the end part of the push rod (6) may slide on the concave conical surface (34). The described helical gear having the gap eliminating device has the advantages of good universality, a wide gap eliminating range, being convenient to adjust, a compact structure, a low cost and being capable of bearing a high axial force, and the helical gear may automatically eliminate gear side gaps generated due to wearing down of a gear tooth.

Description

Helical cylindrical gear with anti-backlash device

Technical field

The invention relates to the technical field of gear transmission, in particular to a helical gear with a backlash device capable of eliminating the flank clearance of a helical gear transmission.

Background technique

Both the gear and the gear have a tooth-side clearance. When the gear transmission pair needs to rotate forward and backward, a certain amount of air return is generated to reduce the transmission accuracy. Therefore, in a device requiring precise transmission, a gear capable of eliminating the flank clearance must be used in order to eliminate the amount of vacancy. The anti-backlash helical gear is a commonly used gear that eliminates the backlash. The patent publication CN205605771U discloses a structure of a backlash helical gear, which is characterized in that it comprises a left-side gear and a right-side gear which are disposed between the left and right half gears. The beak spring further includes a backing ring, a sliding column and an adjusting nut. The backing ring has an annular shape, and the backing ring has a concave tapered surface, and the backing ring is embedded on the left or right side gear and the tapered surface faces outward. The backing ring is coaxial with the left or right half gear; the shape of the sliding column is a cylinder having an "O" shape in cross section, and one end of the sliding column is provided with a screw, and two legs are longitudinally opened on the sliding column. The inclined bottom groove is shallower than the groove on one side of the screw and away from the groove on one side of the screw; the left and right half gears are axially opened in an O shape with an "O" shape in cross section. a hole, the sliding column is installed in the O-shaped hole of the left and right half gears; the two end legs of the spring are respectively inserted into the inclined bottom groove of the two sliding columns; the adjusting nut is screwed on the sliding column On the screw. The anti-backlash working principle of the anti-backlash helical gear is to tighten the adjusting nut and force the sliding column to slide along the O-shaped hole of the left and right half gears in the direction of the adjusting nut, and the bottom surface of the inclined bottom groove will be The end of the ∩ spring is jacked up in the direction of the slot, so that the 弹簧 spring is elastically deformed and expands radially outward along the helical gear, and the ∩ spring is outwardly expanded and squeezed to the concave cone of the backing ring, pushing the left half The gear and the right half gear are axially separated to achieve the purpose of backlash. The disadvantage of the anti-backlash helical spur gear is that the axial direction of the anti-backlash helical spur gear must have a space for accommodating the adjusting nut and the overhanging screw, so that the transmission system with compact structure cannot adopt the anti-backlash helical tooth cylinder. Gear; in addition, the left or right half gear should be machined with the groove of the insert ring, and the left and right half gears are open with O-shaped holes, which increases the processing of the helical gear, especially the two on the processing slide. The inclined bottom groove is more difficult, resulting in a higher cost of the backlash helical gear.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a helical gear having a backlash device capable of eliminating a flank clearance of a helical spur gear transmission. The anti-backlash device of the helical spur gear has versatility and does not need to be in a helical cylinder. An additional structure is arranged on the gear, and sandwiched between the two coaxially mounted helically toothed cylindrical gears can form a backlash helical gear together with the two helically toothed cylindrical gears.

In order to achieve the above object, the technical solution adopted by the present invention is: a helical spur gear having a backlash device, which is composed of a coaxially mounted mesh gear and an E gear and a backlash device, wherein the mesh gear and the B gear are both The helical gear has the same gear parameters; the anti-backlash device is sandwiched between the mesh gear and the b gear, and the anti-backlash device comprises a backlash plate, an adjusting screw, a slider and a push rod; the backlash disk is a disk shape The disc surface of the anti-backlash disc is opposite to the end surface of the nail gear and the gear; the shaft has a shaft hole, the shaft hole of the anti-backlash disc is coaxial with the gear shaft hole; and the disc has a special-shaped hole on the disc surface of the anti-backlash disc The shaped hole is a through hole; a concave tapered surface is arranged on the disk surface of the ripper disk, and the concave tapered surface is concave; the optical hole is opened in the radial direction on the cylindrical surface of the snubber disk, and the light hole is a through hole and The special-shaped hole is connected; a blind hole is arranged on the anti-backlash disk, the blind hole is coaxial with the optical hole, one end of the blind hole is connected with the special-shaped hole, and the other end of the blind hole is closed; the adjusting screw is installed in the optical hole and the blind hole And can rotate in the light hole and the blind hole; the slider is placed in the special hole, and the adjusting screw is arranged on the slider a threaded hole, the slider is sleeved on the adjusting screw and can move along the axial direction of the adjusting screw with the rotation of the adjusting screw; the push rod is made of an elastic material, and the push rod is fixed on the slider, and the end of the push rod The portion slides on the concave tapered surface of the ripper disk as the slider moves along the axial direction of the adjusting screw.

The anti-backlash principle of the anti-backlash device of the helical gear is: rotating the adjusting screw so that the slider on the adjusting screw moves along the axial direction of the adjusting screw, and the push rod fixed on the slider also moves, the end of the push rod The portion slides on the concave tapered surface of the anti-backlash disk. When the slider moves in the direction away from the axial hole of the anti-backlash disk, the end portion of the push rod moves from the lower portion of the concave tapered surface to the concave tapered surface. At the high point, the A and G gears are respectively moved in the axial direction away from the backlash plate, and the axial distance between the A gear and the B gear is enlarged, thereby achieving the purpose of eliminating the gap. When the flank clearance of the helical spur gear transmission pair is eliminated, the axial distance between the mesh gear and the E gear can no longer be further enlarged. At this time, continue to rotate the adjusting screw so that the slider faces away from the shaft hole of the ripper disk. Movement, since the end of the push rod can no longer push the arm gear and the b gear to move away from the anti-backlash disc, that is, the end of the push rod has been stuck, so that the push rod is forced to elastically deform and generate an elastic force, thereby A backlash preload is formed. When the helical gear transmission pair is operated for a long period of time and the gear teeth are worn, and the flank clearance is regenerated, the end of the push rod can be driven to the height of the concave cone by the elastic force, and pushes the gear, The E gear further moves away from the backlash plate, and the axial distance between the pin gear and the B gear is further enlarged, thereby automatically eliminating the backlash caused by the tooth wear.

Compared with the patent of CN205605771U, the invention has the following significant progress: 1 The anti-backlash device of the helically toothed cylindrical gear does not need to have an additional structure on the helical gear, and is clamped on the two coaxial installation. Between the cylindrical gears, a type of anti-backlash device can be applied to helical gears of different diameters, so it has versatility and good applicability; 2 the two disc faces of the anti-backlash disc are provided with concave tapered surfaces. The backlash range is doubled; 3 the head of the adjusting screw is exposed to the cylinder of the snubber disk, and the screwdriver can be rotated from the radial direction to adjust the screw, so that the backlash adjustment is convenient; 4 in the axial direction of the helical gear Adjusting the nut, there is no need to reserve space for the screw to extend, so the structure is compact; 5 because of the versatility, the structure can be standardized, the production can be batched; 6 there are no difficult parts, plus mass production, so the cost Lower.

In addition, the invention also has the advantages of the patent with the authorization bulletin number CN205605771U: 1 can automatically eliminate the flank clearance caused by the tooth wear; 2 can withstand a large axial force during the transmission, and thus the spiral of the helical gear The angle can be designed to be relatively large; 3 when the taper angle of the concave tapered surface of the anti-backlash disk is large to a certain extent, a self-locking effect occurs, in other words, even if there is a large axial force during transmission, the nail gear is pushed. The flank clearance is generated by moving together with the E gear in the axial direction.

As a modification, the helical spur gear having the anti-backlash device of the present invention further includes a flat key, and the mesh gear is provided with a cylindrical boss coaxial with the pin gear on the end face of the b gear, the gear of the b gear The shaft hole is sleeved on the cylindrical boss of the nail gear, and the flat gear is used to restrict the rotation of the electric gear with respect to the nail gear, and the shaft hole of the anti-backlash disc is set on the cylindrical boss.

As a modification, the helical gear having the anti-backlash device of the present invention further includes a thrust spring, the cylindrical boss of the mesh gear is provided with an annular groove, the thrust spring is spiral, and the thrust spring is mounted in the annular groove. The outer diameter of the thrust spring is larger than the outer diameter of the cylindrical boss, and the inner diameter of the thrust spring is smaller than the outer diameter of the cylindrical boss. One end of the thrust spring bears against the double gear and the other end faces the side of the annular groove. The function of the thrust spring is to block the escape of the E-gear from the cylindrical boss of the A-gear, so that the A-gear and the E-gear and the anti-backlash device sandwiched between them are assembled into one piece. The second is the thrust of the thrust spring. When the slider of the device is in the position close to the shaft hole of the anti-backlash disc, the nail gear, the anti-backlash device and the b gear are abutted against each other, which facilitates the installation and disassembly of the helical gear transmission pair.

DRAWINGS

The contents expressed in the drawings of the specification and the marks in the drawings are briefly described below:

Figure 1 is a schematic view showing the structure of a helical gear having a backlash device;

2 is a schematic structural view of a helical spur gear having a backlash device, which is a front view, and the cut position of FIG. 1 is indicated;

Figure 3 is a schematic structural view of a backlash device;

Figure 4 is a schematic view showing the structure of the anti-backlash device, which is a front view showing the cutting position of Figure 3 and the cutting position of Figure 5;

Figure 5 is a cross-sectional view taken along line C-C of Figure 4, showing four pushers fixed to one slider;

Figure 6 is a schematic view showing the structure of the anti-backlash device in the simplified structure of Figure 3, wherein the simplified backlash plate has only one disk surface provided with a concave tapered surface;

Figure 7 is a schematic view showing the structure of the anti-backlash device simplified in the structure of Figure 5, the simplified backlash plate has only one disk surface provided with a concave tapered surface; and shows that two sliders are fixed on one slider ;

Figure 8 is a structural schematic view of a helically toothed cylindrical gear having a backlash device, illustrating that the end of the push rod moves from a lower portion of the concave tapered surface to a concave tapered surface as the slider moves away from the axial hole. The high point, which in turn pushes the A gear and the B gear to move away from the backlash plate;

Figure 9 is a front elevational view of a helically toothed cylindrical gear having a backlash device, in which a pinion gear is not shown, the cutaway position of Figure 8 is indicated, illustrating that when the slider is moved away from the axle bore, The end of the push rod then moves from the lower part of the concave tapered surface to the high point of the concave tapered surface, thereby pushing the mesh gear and the B gear to move away from the backlash plate;

Figure 10 is a schematic structural view of the helical gear with improved anti-backlash device. The gear in the figure is provided with a cylindrical boss. The gears and the anti-backlash plate are set on the cylindrical boss of the nail gear, and the cylindrical boss is opened. There is an annular groove in which a thrust spring is mounted.

The markings in the drawing are: 1 - A gear, 11 - cylindrical boss, 12 - annular groove, 2 - E gear, 21 - gear shaft hole, 3 - anti-backlash disk, 31 - disk surface , 32 - shaft hole, 33 - shaped hole, 34 - concave cone, 35 - cylinder, 36 - light hole, 37 - blind hole, 4 - adjusting screw, 5 - slider, 6 - push rod, 7 - flat key, 8 - thrust spring.

Detailed ways

As shown in FIG. 1 and FIG. 2, a helical gear having a backlash device is composed of a coaxially mounted mesh gear 1 and an E gear 2 and a backlash device, and both the pin gear 1 and the b gear 2 are The helical gear has the same gear parameters, and the mesh gear 1 and the b gear 2 pass the key so that the mesh gear 1 and the gear 2 cannot rotate relative to each other, and the mesh gear 1 or the gear 2 can move axially; The anti-backlash device is sandwiched between the mesh gear 1 and the E gear 2, and the anti-backlash device comprises a backlash plate 3, an adjusting screw 4, a slider 5, and a push rod 6; as shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 The backlash disc 3 is a circular disc, and may also be an elliptical disc or a polygonal disc. The disc surface 31 of the anti-backlash disc 3 is opposite to the end faces of the mesh gear 1 and the E-gear 2, and the anti-backlash disc 3 has a shaft hole. 32. The shaft hole 32 of the snubber disk 3 is coaxial with the gear shaft hole 21, and the shaft hole 32 of the snubber disk 3 is sleeved on the shaft to radially position the ripper disk 3, so that the ripper disk 3 can only follow The shaft is axially slipped; as shown in FIG. 3 and FIG. 4, two irregular holes 33 are formed in the disk surface 31 of the snubber disk 3, the shaped holes 33 are through holes, and the shaped holes 33 are symmetrically arranged, and the sash plate 3 is arranged. You can also set 2 on The upper shaped hole 33; as shown in FIG. 3 and FIG. 5, the two disk faces 31 of the ripple disk 3 are provided with a concave tapered surface 34, or a disk surface 31 of the suffix disk 3 is provided with a concave tapered surface 34 (such as As shown in FIG. 6 and FIG. 4, as shown in FIG. 3 and FIG. 4, the concave tapered surface 34 has a concave shape, and the concave tapered surface 34 is coaxial with the shaft hole 32 of the suffix disk 3; as shown in FIG. 3 and FIG. As shown, two apertures 36 are formed in the direction perpendicular to the axis of the shaft hole 32 on the cylindrical surface 35 of the snubber disk 3, the optical apertures 36 are symmetrically arranged, and the optical apertures 36 are through holes and are connected to the shaped apertures 33. Two or more optical holes 36 may be disposed on the snubber disk 3, and the snubber disk 3 is further provided with a blind hole 37 equal in number to the optical hole 36. The blind hole 37 is coaxial with the optical hole 36, and one end of the blind hole 37 is The shaped hole 33 is closed, and the other end of the blind hole 37 is closed; as shown in FIGS. 3 and 4, the adjusting screw 4 is mounted in the light hole 36 and the blind hole 37 and can be rotated in the light hole 36 and the blind hole 37. The slider 5 is placed in the special-shaped hole 33, and the slider 5 is provided with a threaded hole which cooperates with the adjusting screw 4. The slider 5 is sleeved on the adjusting screw 4 and can be along the adjusting screw 4 with the rotation of the adjusting screw 4. Axial movement; as shown in FIG. 3, FIG. 4, FIG. 5, the push rod 6 is made of elastic material The push rod 6 is fixed on the slider 5, and the end of the push rod 6 slides on the concave tapered surface 34 of the anti-backlash disc 3 as the slider 5 moves along the axial direction of the adjusting screw 4, and is fixed at 1 The push rods 6 on the sliders 5 are four (as shown in Figs. 3 and 5), and the push rods 6 fixed to one slider 5 may be two (as shown in Figs. 6 and 7). .

As an improvement, as shown in FIG. 10, the helically toothed cylindrical gear having the anti-backlash device of the present invention further includes a flat key 7, which is disposed coaxially with the nail gear 1 on the end face of the E gear 2 Cylindrical boss 11, the gear shaft hole 21 of the gear 2 is sleeved on the cylindrical boss 11 of the pinion gear 1 and enables the arm gear 2 to slide axially on the cylindrical boss 11 and pass the flat key 7 The limit gear 2 is rotated relative to the pinion gear 1, and the shaft hole 32 of the ripstop disk 3 is sleeved on the cylindrical boss 11 so that the swash plate 3 can be axially slid on the cylindrical boss 11.

As an improvement, as shown in FIG. 10, the helical gear having the anti-backlash device of the present invention further includes a thrust spring 8, and the cylindrical boss 11 of the mesh gear 1 is provided with an annular groove 12, the thrust spring 8 is a spiral shape, the thrust spring 8 is mounted 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 the one end of the thrust spring 8 is The E gear 2 is attached and the other end is placed against the side of the annular groove 12.

Claims

A helical spur gear having a backlash device, comprising a coaxially mounted mesh gear (1) and a b gear (2) and a backlash device, the arm gear (1) and the b gear (2) are both inclined The spur gear has the same gear parameters; the feature is that the anti-backlash device is sandwiched between the pin gear (1) and the b gear (2), and the anti-backlash device includes a ripper disk (3) and an adjusting screw (4) , the slider (5), the push rod (6); the backlash disc (3) is disc-shaped, the disc surface (31) of the anti-backlash disc (3) and the end faces of the mesh gear (1) and the E-gear (2) The shaft groove (32) is opened on the backlash plate (3), and the shaft hole (32) of the backlash plate (3) is coaxial with the gear shaft hole (21); on the disk surface of the backlash plate (3) ( 31) a shaped hole (33) is opened, and the shaped hole (33) is a through hole; a concave tapered surface (34) is provided on the disk surface (31) of the ripper disk (3), and the concave tapered surface (34) is concave a light hole (36) is formed in a radial direction on the cylinder surface (35) of the snubber disk (3), the light hole (36) is a through hole and is connected to the shaped hole (33); the ripper disk (3) a blind hole (37) is disposed, the blind hole (37) is coaxial with the light hole (36), one end of the blind hole (37) is connected to the shaped hole (33), and the other end of the blind hole (37) is closed; The adjusting screw (4) is mounted in the light hole (36) and blind (37) can be rotated in the light hole (36) and the blind hole (37); the slider (5) is placed in the shaped hole (33), and the adjusting screw (4) is arranged on the slider (5) With the threaded hole, the slider (5) is sleeved on the adjusting screw (4) and can move along the axial direction of the adjusting screw (4) with the rotation of the adjusting screw (4); the push rod (6) is made of an elastic material Made up, the push rod (6) is fixed on the slider (5), and the end of the push rod (6) moves along the axial direction of the adjusting screw (4) with the slider (5) in the anti-backlash plate (3) The concave tapered surface (34) slides.
A helical gear having a backlash device according to claim 1, further comprising a flat key (7), the arm gear (1) being disposed on the end face of the E gear (2) and the gear (1) A coaxial cylindrical boss (11), the gear shaft hole (21) of the gear (2) is placed on the cylindrical boss (11) of the nail gear (1), and passes through the flat key (7) The limit gear (2) is rotated relative to the pin gear (1), and the shaft hole (32) of the ripstop disk (3) is fitted over the cylindrical boss (11).
A helical spur gear having a backlash device according to claim 2, further comprising a thrust spring (8), the cylindrical boss (11) of the mesh gear (1) having an annular groove (12) The thrust spring (8) is spiral, and the thrust spring (8) is mounted in the annular groove (12). The outer diameter of the thrust spring (8) is larger than the outer diameter of the cylindrical boss (11), and the thrust spring (8) The inner diameter of the thrust spring (8) is smaller than the outer diameter of the cylindrical boss (11), and the other end of the thrust spring (8) is placed against the side of the annular groove (12).