CN220523228U - High-precision small-sized sun gear - Google Patents

Abstract

The utility model discloses a high-precision small-sized sun gear, which comprises a central shaft, wherein the central shaft comprises a shaft rod section and a gear section, a plurality of strip-shaped teeth are arranged on the gear section, the top of each tooth is a tooth top, the tooth tops are planes, the two sides of each tooth are tooth surfaces, each tooth surface is a cambered surface, a first round angle is arranged between each tooth top and each tooth surface and used for smoothing excessive tooth tops and tooth surfaces, a plurality of shaft strips are arranged on the shaft rod section, the number of the shaft strips is consistent with that of each tooth, each shaft strip is connected with one end of one tooth, and the joint of each tooth and each shaft strip is smoothly excessive through a second round angle.

Description

High-precision small-sized sun gear

Technical Field

The utility model relates to the field of transmission apparatuses, in particular to a high-precision small-sized sun gear.

Background

Gears are toothed mechanical parts that can intermesh for transmitting power. In planetary gear transmission, an external gear which is coaxial with a planet carrier is a sun gear, and the sun gear outputs power and transmits planet gears meshed around the sun gear.

When the sun gear and a plurality of planet gears are meshed for transmission, noise can be generated by collision between the gears, and long-term transmission can also aggravate abrasion of the gears, so that the noise is reduced, the abrasion of the gears is slowed down, the sun gear can always keep higher precision, and the problem of research at present is always solved. In view of the above problems, a solution is proposed below.

Disclosure of Invention

The utility model aims to provide a high-precision small-sized sun gear, which has the advantages of reducing stress during gear collision, reducing noise and slowing down wear.

The technical aim of the utility model is realized by the following technical scheme:

the utility model provides a small-size sun gear of high accuracy, includes the center pin, the center pin includes axostylus axostyle section and gear section, be equipped with the tooth of a plurality of rectangular shapes on the gear section, the top of tooth is the tooth top, the tooth top is the plane, two lateral parts of tooth are the flank of tooth, the flank of tooth is the cambered surface, be equipped with first fillet between tooth top and the flank of tooth, first fillet is used for smooth excessive tooth top and the flank of tooth, be equipped with a plurality of axises on the axostylus axostyle section, the quantity of axises is unanimous with the quantity of tooth, every the axises all are connected with the one end of one of them tooth, the junction of tooth and axises is smooth excessive through the second fillet.

Preferably, one end of the shaft strip far away from the teeth is provided with an inclined plane, and the inclined angle of the inclined plane is 45 degrees.

Preferably, the radius of the first round is 0.5mm, the height of the first round is 0.2mm, and the radius of the second round is 0.4mm.

Preferably, one end of the central shaft far away from the gear section is a bottom surface, a connecting channel is arranged on the bottom surface of the central shaft, one end of the connecting channel close to the bottom surface is provided with a conical guide groove, and the guide groove is communicated with the connecting channel.

Preferably, the auxiliary connecting block is inserted in the connecting channel, the auxiliary connecting block is provided with a plug hole, the plug hole is fixed with an external power shaft, a plurality of raised strips are fixedly arranged on the outer side wall of the auxiliary connecting block, grooves corresponding to the raised strips are arranged on the connecting channel, the raised strips are inserted in the grooves, so that the auxiliary connecting block and the connecting channel cannot rotate, and the auxiliary connecting block is used for connecting the external power shaft and the central shaft.

Preferably, the end part of the auxiliary connecting block is provided with an inserting block matched with the shape of the guide groove, the inserting block is fixedly inserted into the guide groove, the guide groove is fixedly provided with a threaded rod, the inserting block is provided with a connecting hole, the threaded rod is matched with the position of the connecting hole, the threaded rod is provided with a screw cap, and the inserting block and the guide groove are fixedly connected with each other through the threaded rod and the screw cap.

Preferably, the total length of the central shaft is 35-40 mm, the length of the long teeth is 22-25 mm, the length of the shaft bar is 13-15 mm, the diameter of the central shaft is 15-18 mm, the height of the teeth is 4.3-4.5 mm, and the height of the shaft bar is 2.7-3 mm.

The beneficial effects of the utility model are as follows: the tooth surface of the tooth is set to be arc, so that when the tooth of the sun gear is contacted with the tooth of the external planet gear, the contact force between the planet gear and the tooth can be relieved, noise and abrasion are reduced, and the sun gear can always keep higher precision.

Drawings

FIG. 1 is a schematic diagram of an embodiment;

FIG. 2 is a schematic diagram of an embodiment for showing another direction;

FIG. 3 is a front view of an embodiment tooth orientation;

FIG. 4 is an enlarged view of area A of FIG. 3;

fig. 5 is a cross-sectional view of an embodiment.

Reference numerals: 1. a central shaft; 2. teeth; 3. tooth tops; 4. tooth surfaces; 5. a first rounded corner; 6. a shaft strip; 7. a second rounded corner; 8. an inclined plane; 9. a connection channel; 10. a guide groove; 11. auxiliary connecting blocks; 12. a plug hole; 13. a convex strip; 14. inserting blocks; 15. a threaded rod; 16. a groove.

Detailed Description

The following description is only of the preferred embodiments of the present utility model, and the scope of the present utility model should not be limited to the examples, but should be construed as falling within the scope of the present utility model. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

As shown in fig. 1 to 5, a high-precision small-sized sun gear includes a center shaft 1. The central shaft 1 is a part which is directly contacted and connected with an external power element such as a motor. The total length of the central shaft 1 is 35-40 mm, the diameter of the central shaft 1 is 15-18 mm, the length of the central shaft 1 is 37mm, and the diameter of the central shaft 1 is 17.33mm. The length of the central shaft 1 determines the total length of the sun gear, which in the present application is of a smaller construction as a whole than usual.

One end of the central shaft 1 is a bottom surface, a connecting channel 9 is arranged on the bottom surface, an auxiliary connecting block 11 is inserted in the connecting channel 9, an external motor shaft is connected with the auxiliary connecting block 11, and then the auxiliary connecting block 11 is inserted into the connecting channel 9, so that the motor shaft can be connected with the central shaft 1. One end of the connecting channel 9 close to the bottom surface is provided with a conical guide groove 10, one end of the guide groove 10 is communicated with the connecting channel 9, and the diameter of one end of the guide groove 10 far away from the connecting channel 9 is larger than that of the connecting channel 9. The guide groove 10 allows the auxiliary block 11 to be easily inserted into the connection channel 9.

The auxiliary joint block 11 is provided with a plug hole 12, and a power shaft of an external motor is inserted into the plug hole 12. According to different motor shaft specifications, the plug holes 12 with different specifications can be selected, so that the applicability of the sun gear is improved. The lateral wall of supplementary joint 11 has set firmly a plurality of sand grip 13 on, is equipped with the recess 16 that corresponds with sand grip 13 on the connecting channel 9, and when supplementary joint 11 inserted in connecting channel 9, a plurality of sand grip 13 can insert a plurality of recesses 16 respectively for unable rotation between supplementary joint 11 and the connecting channel 9, motor or other power supply can drive center pin 1 through supplementary joint 11 and rotate.

The end of the auxiliary connecting block 11 is provided with the inserting block 14 matched with the guide groove 10 in shape, and the inserting block 14 can completely fill the guide groove 10, so that the end of the auxiliary connecting block 11 cannot shake, and stability is improved. The guide groove 10 is fixedly provided with a threaded rod 15, the insert block 14 is provided with a connecting hole, the position of the threaded rod 15 is matched with that of the connecting hole, after the insert block 14 is inserted into the guide groove 10, one end of the threaded rod 15 passes through the connecting hole and is positioned at the outer side of the insert block 14, and then the insert block 14 is fixed in the guide groove 10 through a nut, so that the fixation of an external power element and the rear central shaft 1 is realized.

The central shaft 1 comprises a shaft rod section and a gear section, a plurality of strip-shaped teeth 2 are arranged on the gear section, and a plurality of shaft strips 6 are arranged on the shaft rod section. The length of the strip-shaped teeth 2 is 22-25 mm, the height of the teeth 2 is 4.3-4.5 mm, the length of the shaft strip 6 is 13-15 mm, and the height of the shaft strip 6 is 2.7-3 mm. The tooth 2 designed in the application has the length of 23mm, the height of the tooth 2 of 4.48mm, the length of the shaft strip 6 of 14mm and the height of the shaft strip 6 of 2.83mm

The number of the shaft strips 6 is consistent with that of the teeth 2, and each shaft strip 6 is connected with one end of one tooth 2. The joint of the tooth 2 and the shaft strip 6 is smoothly excessive through a second round angle 7, and the radius of the second round angle 7 is 0.4mm. The axle strip 6 and tooth 2 all encircle the lateral wall evenly distributed of center pin 1, and tooth 2 and outside planet wheel meshing, axle strip 6 on the one hand can consolidate the rack, on the other hand also can increase the contact with external equipment to stability when increasing the sun gear rotation.

The end of the shaft strip 6 far away from the tooth 2 is provided with an inclined plane 8, and the inclined angle of the inclined plane 8 is 45 degrees. The inclined planes 8 on the shaft strips 6 are matched with each other, so that the diameter of one end, away from the teeth 2, of the shaft strip 6 is smaller than the diameter of the position where the main body of the shaft strip 6 is located, and the sun gear can be conveniently inserted into external equipment.

The top of the tooth 2 is a tooth top 3, the tooth top 3 is a plane, two side parts of the tooth 2 are tooth surfaces 4, and the tooth surfaces 4 are cambered surfaces. The arcuate tooth surface 4 can reduce the interval of the tooth 2 and tooth 2 of the planet gear when meshing, thus make the planet gear can drive with the sun gear, slow down the wearing and tearing of the tooth 2 on the sun gear.

A first round angle 5 is arranged between the tooth top 3 and the tooth surface 4, and the first round angle 5 is used for smoothing the excessive tooth top 3 and the tooth surface 4. The radius of the first rounded corner 5 is 0.5mm and the height of the first rounded corner 5 is 0.2mm. The first rounded corners 5 also prevent contact with the planet wheels through sharp points, slowing down wear.

The technical problems, technical solutions and advantageous effects solved by the present utility model have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present utility model and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims (7)

1. The utility model provides a small-size sun gear of high accuracy, includes center pin (1), a serial communication port, center pin (1) include with the gear section, be equipped with tooth (2) of a plurality of rectangular shapes on the gear section, the top of tooth (2) is tooth top (3), tooth top (3) are the plane, two lateral parts of tooth (2) are flank (4), flank (4) are the cambered surface, be equipped with first fillet (5) between tooth top (3) and flank (4), first fillet (5) are used for smooth excessive tooth top (3) and flank (4), be equipped with a plurality of axises (6) on the axostylus axostyle section, the quantity of axises (6) is unanimous with the quantity of tooth (2), every axises (6) all are connected with one of them tooth (2), the junction of tooth (2) and axises (6) is smooth excessive through second fillet (7).

2. A high-precision small-sized sun gear according to claim 1, characterized in that the end of the shaft strip (6) far away from the tooth (2) is provided with an inclined surface (8), and the inclined angle of the inclined surface (8) is 45 °.

3. A high precision miniature sun gear according to claim 1, characterized in that the radius of the first fillet (5) is 0.5mm, the height of the first fillet (5) is 0.2mm, and the radius of the second fillet (7) is 0.4mm.

4. The high-precision small-sized sun gear according to claim 1, wherein one end of the central shaft (1) far away from the gear section is a bottom surface, a connecting channel (9) is arranged on the bottom surface of the central shaft (1), a conical guide groove (10) is arranged at one end, close to the bottom surface, of the connecting channel (9), and the guide groove (10) is communicated with the connecting channel (9).

5. The high-precision small sun gear according to claim 4, wherein an auxiliary connecting block (11) is inserted in the connecting channel (9), a plugging hole (12) is formed in the auxiliary connecting block (11), the plugging hole (12) is fixed with an external power shaft, a plurality of raised strips (13) are fixedly arranged on the outer side wall of the auxiliary connecting block (11), grooves (16) corresponding to the raised strips (13) are formed in the connecting channel (9), the raised strips (13) are plugged in the grooves (16) so that rotation cannot occur between the auxiliary connecting block (11) and the connecting channel (9), and the auxiliary connecting block (11) is used for connecting the external power shaft and the central shaft (1).

6. The high-precision small sun gear according to claim 5, wherein an insertion block (14) matched with the guide groove (10) in shape is arranged at the end part of the auxiliary connection block (11), the insertion block (14) is fixedly inserted into the guide groove (10), a threaded rod (15) is fixedly arranged on the guide groove (10), a connecting hole is formed in the insertion block (14), the threaded rod (15) is matched with the position of the connecting hole, a screw cap is arranged on the threaded rod (15), and the insertion block (14) and the guide groove (10) are fixedly connected through the threaded rod (15) and the screw cap.

7. A high precision miniature sun gear according to claim 1, characterized in that the total length of the central shaft (1) is 35-40 mm, the length of the elongated teeth (2) is 22-25 mm, the length of the axle strip (6) is 13-15 mm, the diameter of the central shaft (1) is 15-18 mm, the height of the teeth (2) is 4.3-4.5 mm, and the height of the axle strip (6) is 2.7-3 mm.