CN213899765U

CN213899765U - Planetary reduction gear box

Info

Publication number: CN213899765U
Application number: CN202022786821.6U
Authority: CN
Inventors: 钟文
Original assignee: DONGGUAN SILENT INDUSTRIAL CO LTD
Current assignee: DONGGUAN SILENT INDUSTRIAL CO LTD
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-08-06
Anticipated expiration: 2030-11-25

Abstract

The utility model provides a planetary reduction gearbox, which comprises a box body, wherein the box body is connected with a cover plate and a bottom plate, the cover plate is connected with an output shaft through two ball bearings, an internal gear is integrally formed in the box body, and a first transmission assembly, a second transmission assembly, a third transmission assembly, a fourth transmission assembly and an output gear set are arranged in the first internal gear; the first transmission assembly, the second transmission assembly, the third transmission assembly and the fourth transmission assembly are transmission gear sets, each transmission gear set comprises a first planet carrier, a first gear shaft, a first planet gear and a sun gear, and the pressure angle of each first planet gear is 22.5 degrees; the output gear set includes a second carrier, a second gear shaft, and second planet gears having a pressure angle of 22.5 °. The utility model discloses can ensure the uniformity of gear train inner structure, can form great reduction ratio, improve planetary gear's wearability and tooth strength resistance through increase planetary gear's pressure angle.

Description

Planetary reduction gear box

Technical Field

The utility model relates to a gear box specifically discloses a planetary reduction gear box.

Background

The gear box is generally used in cooperation with a motor, and is widely applied to the fields of intelligent home, intelligent automobiles, medical appliances, industrial application and the like. The reduction gear box is a speed changer for realizing speed change through a planetary gear mechanism, and is an indispensable power transmission assembly of an automatic product.

Different application scenes and different reduction requirements on the gear box, when the reduction gear box is applied to a product with a larger reduction ratio, a plurality of groups of planetary gear sets are usually arranged inside the gear box to achieve the requirement of high-efficiency reduction, but the internal structure of the reduction gear box is complex, the noise of transmission is large, once abrasion occurs, the transmission error is larger than that of a common gear box, the consistency among the sub assemblies in the gear box is difficult to control, the transmission precision of the gear box is poor, and the service life of the gear box is short.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide a planetary reduction gear box, which can ensure the smooth operation of the whole structure of the gear box while forming a large reduction ratio.

In order to solve the prior technical problem, the utility model discloses a planetary reduction gearbox, which comprises a box body, wherein two ends of the box body are respectively connected with a cover plate and a bottom plate, an output shaft is arranged in the cover plate, the cover plate is connected with the output shaft through two ball bearings, the two ball bearings are positioned at different positions on the output shaft, an internal gear is integrally formed in the box body, a first transmission component, a second transmission component, a third transmission component, a fourth transmission component and an output gear set are arranged in the internal gear, the input end of the first transmission component is connected with a motor gear, a circular motor press-fit through hole is arranged in the motor gear, the output end of the first transmission component is connected with the input end of the second transmission component, the output end of the second transmission component is connected with the input end of the third transmission component, the output end of the third transmission component is connected with the input end of the fourth transmission component, the output end of the fourth transmission component is connected with the input end of the output gear set, the output end of the output gear set is connected with the output shaft;

the first transmission assembly, the second transmission assembly, the third transmission assembly and the fourth transmission assembly are transmission gear sets, each transmission gear set comprises a first planet carrier, four first gear shafts, four first planet gears and a sun gear, the four first gear shafts are fixed on one side, close to the bottom plate, of the first planet carrier, the sun gear is coaxially fixed on one side, close to the cover plate, of the first planet carrier, the four first planet gears are sleeved outside the four first gear shafts respectively, the four first planet gears are connected to the inner side of the inner gear in a meshed mode, the input end of each transmission gear set is formed among the four first planet gears, the sun gear is the output end of the transmission gear set, and the pressure angle of each first planet gear is 22.5 degrees;

the output gear set comprises a second planet carrier, four second gear shafts and four second planet gears, the four second gear shafts are fixed on one side, close to the bottom plate, of the second planet carrier, the four second planet gears are sleeved outside the four second gear shafts respectively, the four second planet gears are connected to the inner side of the inner gear in a meshed mode, the input end of the output gear set is formed among the four second planet gears, the output end of the output gear set is formed in the center of the second planet carrier, and the pressure angle of the second planet gears is 22.5 degrees.

Furthermore, one side of the cover plate far away from the bottom plate is provided with a fixing sleeve, and the fixing sleeve is welded outside the output shaft in a laser mode.

Furthermore, the both ends of box all are equipped with a slot, and one side integrated into one piece that the apron is close to the bottom plate has the interference fit piece, and one side integrated into one piece that the bottom plate is close to the apron has the sliding fit piece, and the interference fit piece crimping is inserted in one of them slot, and the sliding fit piece is inserted and is connect in another slot.

Furthermore, the lateral wall of box is equipped with the locking through-hole, and the side of sliding fit piece is equipped with the screw, and the screw passes locking through-hole and screw threaded connection.

Furthermore, a third gasket is arranged between the first transmission assembly and the sliding fit block.

Furthermore, the center of second planet carrier is equipped with output press-fit through-hole, and the second planet carrier is equipped with around the shaft press-fit through-hole of output press-fit through-hole all around, and the output shaft compresses tightly to be connected in output press-fit through-hole, and the second gear shaft compresses tightly to be connected in shaft press-fit through-hole, and the hardness of second gear shaft is HRC56 ~ 62.

Furthermore, the first planet carrier, the four first gear shafts and the sun gear are of an integrally formed structure.

The utility model has the advantages that: the utility model discloses a planetary reduction gear box, realize being connected between output shaft and the apron through two ball bearing, can effectively ensure the uniformity of gear train inner structure, and the inside quintuple reduction gears that is provided with of gear box, can make and form great reduction ratio between input power and the output power, furthermore, pressure angle through increase planetary gear increases its tooth thickness, can effectively improve planetary gear's wearability and tooth resistance, and four planetary gear cooperations form the input of gear train, can effectively improve the compactedness of meshing between the gear, thereby can ensure that gear box overall structure can realize steady reliable function, the long service life of gear box, the function is smooth and easy, transmission small in noise.

Drawings

Fig. 1 is a schematic view of the exploded structure of the present invention.

Fig. 2 is a schematic view of the cross-sectional structure of the center shaft of the present invention.

The reference signs are: the transmission device comprises a box body 10, an internal gear 11, a slot 111, a locking through hole 12, a screw 13, a cover plate 20, an output shaft 21, a ball bearing 22, an interference fit block 23, a fixed sleeve 24, a bottom plate 30, a sliding fit block 31, a screw hole 311, a third gasket 32, a first transmission assembly 41, a second transmission assembly 42, a third transmission assembly 43, a fourth transmission assembly 44, a motor gear 45, a motor press-fit through hole 451, a transmission gear set 50, a first planet carrier 51, a first gear shaft 52, a first planetary gear 53, a sun gear 54, an output gear set 60, a second planet carrier 61, a wheel shaft press-fit through hole 611, an output press-fit through hole 612, a second gear shaft 62 and a second planetary gear 63.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Refer to fig. 1 and 2.

The embodiment of the utility model discloses a planetary reduction gear box, including the box 10, the both ends of box 10 are connected with apron 20 and bottom plate 30 respectively, be equipped with output shaft 21 in the apron 20, apron 20 is connected with output shaft 21 through two ball bearing 22, two ball bearing 22 are coaxial to be located the different positions on output shaft 21, can effectively restrict the position between apron 20 and the output shaft 21 through two ball bearing 22, can effectively avoid output shaft 21 to incline relative to the ball, can effectively improve the uniformity of overall structure, ensure that output shaft 21 can not deviate from the center, thereby effectively improve the reliability when output shaft 21 operates and rotates, improve the reliability of overall structure, integrated into one piece has internal gear 11 in box 10, be equipped with the first drive assembly 41, second drive assembly 42, third drive assembly 43, fourth drive assembly 44 and the output gear group 60 that connect gradually in internal gear 11, the input end of the first transmission component 41 is connected with a motor gear 45, a motor press-fit through hole 451 with a circular hole section is formed in the motor gear 45, the output end of a motor is matched, tightly attached and connected in a press-fit mode, the consistency is good, the precision of the gear box can be effectively improved, compared with the traditional D-type hole clamp connection mode, the noise can be effectively reduced, the output end of the first transmission component 41 is connected with the input end of the second transmission component 42, the output end of the second transmission component 42 is connected with the input end of the third transmission component 43, the output end of the third transmission component 43 is connected with the input end of the fourth transmission component 44, the output end of the fourth transmission component 44 is connected with the input end of the output gear set 60, and the output end of the output gear set 60 is connected with the output shaft 21;

the first transmission assembly 41, the second transmission assembly 42, the third transmission assembly 43 and the fourth transmission assembly 44 are transmission gear sets 50, the four transmission gear sets 50 can achieve reliable speed reduction transmission effect, the transmission gear set 50 comprises a first planet carrier 51, four first gear shafts 52, four first planet gears 53 and a sun gear 54, the first planet carrier 51 is of a circular plate-shaped structure, the four first gear shafts 52 are fixed on one side of the first planet carrier 51 close to the bottom plate 30, the sun gear 54 is coaxially fixed on one side of the first planet carrier 51 close to the cover plate 20, the four first gear shafts 52 are uniformly distributed around the center of the first planet carrier 51, the four first planet gears 53 are respectively sleeved outside the four first gear shafts 52, the four first planet gears 53 are all connected to the inner side of the inner gear 11 in a meshing manner, the first planet gears 53 can rotate relative to the first gear shafts 52, the four first planetary gears 53 are arranged, so that the transmission effect can be effectively improved, the transmission stability is ensured, the operation reliability of the gear box is improved, the abrasion among gears and the noise generated during operation can be effectively reduced, the input end of the transmission gear set 50 is formed among the four first planetary gears 53, the sun gear 54 is the output end of the transmission gear set 50, the pressure angle of the first planetary gears 53 is 22.5 degrees, preferably, the pressure angles of the motor gear 45 and the sun gear 54 are 22.5 degrees, the tooth thickness of the first planetary gears 53 can be effectively increased, the abrasion resistance and the tooth strength of the first planetary gears 53 are effectively enhanced, the meshing effect is better, the transmission slip ratio among the gears is good, the operation is smoother, and the noise is smaller;

the output gear set 60 comprises a second planet carrier 61, four second gear shafts 62 and four second planet gears 63, the second planet carrier 61 is a circular plate-shaped structure, the four second gear shafts 62 are fixed on one side of the second planet carrier 61 close to the bottom plate 30, the four second gear shafts 62 are uniformly distributed around the center of the second planet carrier 61, the four second planet gears 63 are respectively sleeved outside the four second gear shafts 62, the four second planet gears 63 are all meshed and connected with the inner side of the internal gear 11, the second planet gears 63 can rotate relative to the first gear shafts 52, the arrangement of the four second planet gears 63 can effectively improve the transmission effect, ensure the transmission stability, improve the reliability of the operation of the gear box, and can effectively reduce the abrasion of gear parts and the noise generated during the operation, the input end of the output gear set 60 is formed between the four second planet gears 63, the output of output gear set 60 is formed at the center of second planet carrier 61, and the pressure angle of second planetary gear 63 is 22.5, can effectively increase second planetary gear 63's tooth thickness to effectively strengthen second planetary gear 63's wear resistance and tooth resistance, the effect of meshing is better, and driven slip ratio is good between the gear, and the operation is more smooth and easy, the noise is littleer.

When the planetary gear transmission is assembled and used, the motor gear 45 is connected between the four first planetary gears 53 of the first transmission component 41 in a meshing manner, the sun gear 54 of the first transmission component 41 is connected between the four first planetary gears 53 of the second transmission component 42 in a meshing manner, the sun gear 54 of the second transmission component 42 is connected between the four first planetary gears 53 of the third transmission component 43 in a meshing manner, the sun gear 54 of the third transmission component 43 is connected between the four first planetary gears 53 of the fourth transmission component 44 in a meshing manner, the sun gear 54 of the fourth transmission component 44 is connected between the four second planetary gears 63 in a meshing manner, and the output shaft 21 is fixed at the central position of the second planetary carrier 61. The reliability of the meshing structure between the gears can be obviously improved by enlarging the tooth thickness of each planetary gear, the transmission slip ratio can be effectively improved, the noise is reduced, the smooth degree is improved, and the service life of the whole structure is long.

In this embodiment, one side that bottom plate 30 was kept away from to apron 20 is equipped with fixed cover 24, and fixed cover 24 laser welding can effectively improve the use of saving structures such as jump ring outside output shaft 21, can effectively simplify the structure of gear box, can conveniently assemble simultaneously, can effectively ensure the stability of output shaft 21 structure simultaneously, avoids it because of taking place disconnected axle with the jump ring joint, long service life, compact structure.

In this embodiment, two ends of the box 10 are respectively provided with a slot 111, the two slots 111 are respectively located at two ends of the internal gear 11, one side of the cover plate 20 close to the bottom plate 30 is integrally formed with an interference fit block 23, preferably, two ball bearings 22 are respectively connected in the cover plate 20 and the interference fit block 23, so as to further improve the consistency of the internal structure of the gear box, one side of the bottom plate 30 close to the cover plate 20 is integrally formed with a sliding fit block 31, the interference fit block 23 is pressed and inserted into one of the slots 111, and the sliding fit block 31 is inserted into the other slot 111. Interference fit piece 23 and slot 111 realize compressing tightly the location through interference fit's mode, can form stable connection structure, can effectively avoid the inside finish of box 10 to leak the outside, can also effectively improve overall structure's uniformity, convenient assembling, the shake of the noise that produces when the gear box function is little, can save the use of materials such as glue.

Based on the above embodiment, the side wall of the box 10 is provided with the locking through hole 12, the side surface of the sliding fit block 31 is provided with the screw hole 311, the screw 13 passes through the locking through hole 12 and is in threaded connection with the screw hole 311, preferably, three locking through holes 12, three screw holes 311 and three screws 13 are provided, the position stability between the bottom plate 30 and the box 10 can be further improved through the screws 13, and the assembly and disassembly are convenient.

In the embodiment, the third spacer 32 is disposed between the first transmission assembly 41 and the sliding fit block 31, and the third spacer 32 is disposed between the four first planetary gears 53 of the first transmission set and the sliding fit block 31, so as to effectively improve the reliability of the operation of the gear box, effectively prevent the first planetary gears 53 and the sliding fit block 31 from being abraded to form chips, which affects the accuracy of the operation, and effectively prolong the service life of the entire structure.

In this embodiment, the center of the second planet carrier 61 is provided with an output press-fit through hole 612 as the output end of the output gear set 60, the second planet carrier 61 is provided with a wheel axle press-fit through hole 611 around the output press-fit through hole 612, the output shaft 21 is tightly pressed in the output press-fit through hole 612 in an interference fit manner, the second gear axle 62 is tightly pressed in the wheel axle press-fit through hole 611 in an interference fit manner, the hardness of the second gear axle 62 is HRC 56-62, the output gear set 60 is arranged in an interference fit manner, assembly and maintenance can be conveniently performed, the consistency of the output gear set 60 is good, the reliability is high, the gear axle has enough hardness to effectively improve the wear resistance, and meanwhile, the precision and the service life of the gear box can be effectively improved.

In the present embodiment, the first carrier 51, the four first gear shafts 52, and the sun gear 54 in the same transmission gear set 50 are integrally formed, so that the assembly operation can be effectively simplified, and the consistency of the overall structure can be further improved.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A planetary reduction gearbox comprises a box body (10), wherein two ends of the box body (10) are respectively connected with a cover plate (20) and a bottom plate (30), an output shaft (21) is arranged in the cover plate (20), the planetary reduction gearbox is characterized in that the cover plate (20) is connected with the output shaft (21) through two ball bearings (22), the two ball bearings (22) are located at different positions on the output shaft (21), an internal gear (11) is integrally formed in the box body (10), a first transmission assembly (41), a second transmission assembly (42), a third transmission assembly (43), a fourth transmission assembly (44) and an output gear set (60) are arranged in the internal gear (11), an input end of the first transmission assembly (41) is connected with a motor gear (45), a circular motor press-fit through hole (451) is formed in the motor gear (45), the output end of the first transmission assembly (41) is connected with the input end of the second transmission assembly (42), the output end of the second transmission assembly (42) is connected with the input end of the third transmission assembly (43), the output end of the third transmission assembly (43) is connected with the input end of the fourth transmission assembly (44), the output end of the fourth transmission assembly (44) is connected with the input end of the output gear set (60), and the output end of the output gear set (60) is connected with the output shaft (21);

the first transmission assembly (41), the second transmission assembly (42), the third transmission assembly (43) and the fourth transmission assembly (44) are transmission gear sets (50), each transmission gear set (50) comprises a first planet carrier (51), four first gear shafts (52), four first planet gears (53) and a sun gear (54), the four first gear shafts (52) are fixed on one side, close to the bottom plate (30), of the first planet carrier (51), the sun gear (54) is coaxially fixed on one side, close to the cover plate (20), of the first planet carrier (51), the four first planet gears (53) are respectively sleeved outside the four first gear shafts (52), the four first planet gears (53) are respectively meshed and connected to the inner side of the inner gear (11), and the input end of each transmission gear set (50) is formed among the four first planet gears (53), the sun gear (54) is the output end of the transmission gear set (50), and the pressure angle of the first planet gear (53) is 22.5 degrees;

the output gear set (60) comprises a second planet carrier (61), four second gear shafts (62) and four second planet gears (63), the four second gear shafts (62) are fixed on one side, close to the bottom plate (30), of the second planet carrier (61), the four second planet gears (63) are respectively sleeved outside the four second gear shafts (62), the four second planet gears (63) are all connected to the inner side of the internal gear (11) in a meshed mode, an input end of the output gear set (60) is formed among the four second planet gears (63), an output end of the output gear set (60) is formed in the center of the second planet carrier (61), and a pressure angle of the second planet gears (63) is 22.5 degrees.

2. An epicyclic reduction gearbox according to claim 1, wherein said cover plate (20) is provided with a retaining sleeve (24) on the side remote from said bottom plate (30), said retaining sleeve (24) being laser welded to the outside of said output shaft (21).

3. A planetary reduction gearbox according to claim 1, characterized in that both ends of the box (10) are provided with a slot (111), one side of the cover plate (20) close to the bottom plate (30) is integrally formed with an interference fit block (23), one side of the bottom plate (30) close to the cover plate (20) is integrally formed with a sliding fit block (31), the interference fit block (23) is pressed and inserted into one of the slots (111), and the sliding fit block (31) is inserted into the other slot (111).

4. A planetary reduction gearbox according to claim 3, wherein the side wall of said casing (10) is provided with a locking through hole (12), the side of said sliding fit block (31) is provided with a screw hole (311), and a screw (13) is threaded through said locking through hole (12) and said screw hole (311).

5. A planetary reduction gearbox according to claim 3 or 4, characterized in that a third spacer (32) is provided between said first transmission assembly (41) and said sliding engagement block (31).

6. A planetary reduction gearbox according to claim 1, wherein the second planet carrier (61) is provided with an output press-fit through hole (612) at the center, the second planet carrier (61) is provided with an axle press-fit through hole (611) surrounding the output press-fit through hole (612), the output shaft (21) is press-fitted into the output press-fit through hole (612), the second gear axle (62) is press-fitted into the axle press-fit through hole (611), and the hardness of the second gear axle (62) is HRC 56-62.

7. An epicyclic reduction gearbox according to claim 1, wherein said first planet carrier (51), four said first gear shafts (52) and said sun gear (54) are of an integrally formed structure.