Gearbox

Abstract

The utility model provides a gear box which comprises a box body, a transmission gear set installed in the box body and an output shaft. One end of the output shaft is in transmission connection with the transmission gear set, and the other end extends out of the box body to be connected with a working machine; the transmission gear set comprises an input worm, a first-stage worm helical gear assembly, a second-stage helical gear straight gear assembly and a third-stage straight gear; the first-stage worm and bevel gear assembly comprises a first-stage worm and a first-stage bevel gear which rotate synchronously, and the second-stage bevel gear and straight gear assembly comprises a second-stage bevel gear and a second-stage straight gear which rotate synchronously; the input worm is meshed with the first-stage bevel gear, the first-stage worm is meshed with the second-stage bevel gear, the second-stage straight gear is meshed with the third-stage straight gear, and the third-stage straight gear is installed on the output shaft, so that transmission connection between the transmission gear set and the output shaft is achieved. The gearbox is compact in structure, small in appearance size and capable of achieving self-locking.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a gear box. BACKGROUND

[0002] Motors are a kind of equipment using electromagnetic induction principle to convert electric energy into mechanical energy, and are widely used in industrial production and various electric appliances required in life. Motors are usually provided with gear boxes for realizing speed change, changing transmission direction, changing transmission torque, clutching and other functions.

[0003] The common gear box structure of motor usually includes input shaft, output shaft, gear set and box. The input shaft is the power input end of the gear box, used to connect with the motor to transmit power to the inside of the gear box; the output shaft is the power output end of the gear box, used to transmit power after speed change by the gear box to the working machine; the box is the shell of the gear box, used to fix gears, shafts and other structures, protect internal parts from the influence of external environment, and install the gear box on the motor; the gear set is the core component of the gear box, used to transmit power input from the input shaft to the output shaft after speed and torque conversion by the meshing of different gears, so as to realize various functions of the gear box.

[0004] The gear set of the motor gear box of prior art usually adopts multi-stage planetary gear mode or worm and worm gear mode. The multi-stage planetary gear mode is composed of the combination of multiple planetary gear sets, each planetary gear set can realize different transmission ratio, and multiple planetary gear sets in series or parallel can realize multi-stage transmission, so as to realize more complex transmission ratio and function; the multi-stage planetary gear mode has the advantages of high efficiency, high precision and compact structure, but usually does not have self-locking function. The worm and worm gear mode is a special gear transmission form, in which the worm is a spiral axial gear, the worm wheel is a cylindrical gear meshing with the worm, the worm is usually the driving part, the worm wheel is the driven part, power transmission is realized through spiral meshing, which can realize large transmission ratio, high torque transmission and axial vertical transmission demand, and the worm and worm gear mode can realize self-locking because the worm wheel is difficult to drive the worm reversely; but the efficiency of the worm and worm gear transmission mode is low, and the volume is relatively large, which is not conducive to the miniaturization of the gear box and motor product.

[0005] Therefore, it is urgent to develop a new gear box structure which has smaller product volume and self-locking function at the same time. SUMMARY

[0006] The utility model discloses a kind of gear boxes, which can realize smaller product volume and self-locking function at the same time.

[0007] In order to realize the above-mentioned purpose, the utility model provides a gear box, include: box, install transmission gear group in the box, and output shaft, transmission gear group transmission connection is established to the output shaft one end, the other end stretches out the box to connect working machine,

[0008] Transmission gear group includes input worm, first grade worm helical gear assembly, second grade helical gear spur gear assembly, third grade spur gear, first grade worm helical gear assembly includes synchronous rotation's first grade worm and first grade helical gear, second grade helical gear spur gear assembly includes synchronous rotation's second grade helical gear and second grade spur gear, input worm is engaged with first grade helical gear, first grade worm is engaged with second grade helical gear, second grade spur gear is engaged with third grade spur gear, third grade spur gear is installed on output shaft, thereby realizes transmission gear group and the transmission connection of output shaft.

[0009] First grade worm and first grade helical gear rotate around the same axis, second grade helical gear and second grade spur gear rotate around the same axis.

[0010] The angle between the input worm axis and the first grade helical gear axis is 90°, and the angle between the first grade worm axis and the second grade helical gear axis is 90°.

[0011] The box includes a top cover and a box shell that are buckled to each other, the top cover is provided with an axle hole at the top for the output shaft to extend out of the box to connect the working machine, and the box shell is open at the bottom for installing a motor.

[0012] The gear box further includes a first bearing, the top cover is provided with a mounting groove for installing the first bearing, and the output shaft is installed on the top cover through the first bearing.

[0013] The first bearing is a deep groove ball bearing.

[0014] The gear box further includes a first gasket, a second gasket, and a snap spring, the output shaft sequentially passes through the axle hole, the first gasket, the first bearing, the second gasket, and the snap spring to extend out of the top cover.

[0015] The gear box further comprises a first shaft pin, a second shaft pin, the box shell comprises an outer shell, a cavity surrounded by the outer shell, a first mounting plate arranged in the middle of the cavity, a second mounting plate arranged at the bottom of the cavity, and a mounting cavity formed between the first mounting plate, the second mounting plate and the outer shell; the third level straight gear is arranged between the first mounting plate and the upper cover; the input worm is arranged in the mounting cavity, one end of the input worm is mounted on the first mounting plate, and the other end of the input worm is used for being connected with the motor in transmission; the first level worm helical gear assembly is fixed in the mounting cavity through the first shaft pin, the second level helical gear straight gear assembly is fixed on the second mounting plate through the second shaft pin, and the second level straight gear protrudes out of the mounting cavity and is connected with the third level straight gear in transmission.

[0016] The gear box further comprises a second bearing, the first mounting plate is provided with a mounting hole for mounting the second bearing, and the input worm is mounted on the first mounting plate through the second bearing.

[0017] The input worm and the output shaft are located on the same axis, and the input worm and the output shaft respectively protrude into the two ends of the second bearing and are matched with the second bearing in clearance.

[0018] The gear box has the advantages that the gear box is compact in structure, small in product appearance size, capable of realizing self-locking function, stable in transmission, and small in noise. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to further understand the features and technical contents of the utility model, please refer to the following detailed description and drawings of the utility model, however, the drawings are only provided for reference and illustration, and are not used to limit the utility model. In the drawings,

[0020] Figure 1 It is an exploded state schematic view of the gear box of the utility model embodiment;

[0021] Figure 2 It is Figure 1 It is a three-dimensional assembly schematic view of the gear box.

[0022] Figure 3 It is Figure 2 It is a three-dimensional assembly schematic view of the gear box.

[0023] Figure 4 It is a three-dimensional schematic view of the upper cover of the gear box body of the utility model embodiment.

[0024] Figure 5 It is a three-dimensional assembly schematic view of the gear box of the utility model embodiment when the gear box upper cover part is not mounted.

[0025] Figure 6It is the three-dimensional schematic view of the box shell of the gear box body of one embodiment of the utility model.

[0026] Figure 7 It is the assembly schematic view of the gear box removing the box body of one embodiment of the utility model.

[0027] Figure 8 For Figure 7 The assembly schematic view of another angle. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means adopted by the utility model and its effects, the following will be described in detail in combination with the preferred embodiments of the utility model and its drawings.

[0029] Please refer to Figures 1-8 The utility model provides a gear box, include: box 1, install in the transmission gear group 2 of box 1, and output shaft 3, transmission gear group 2 is connected with the transmission of output shaft 3, and the other end of the box 1 is connected with the work machine of the extension,

[0030] Transmission gear group 2 includes input worm 21, first grade worm helical gear assembly 22, second grade helical gear spur gear assembly 23, third grade spur gear 24, first grade worm helical gear assembly 22 includes the synchronous rotation of first grade worm 221 and first grade helical gear 222, second grade helical gear spur gear assembly 23 includes the synchronous rotation of second grade helical gear 231 and second grade spur gear 232, input worm 21 is engaged with first grade helical gear 222 to transmit power to first grade worm helical gear assembly 22, first grade worm 221 is engaged with second grade helical gear 231 to transmit power to second grade helical gear spur gear assembly 23, second grade spur gear 232 is engaged with third grade spur gear 24 to transmit power to third grade spur gear 24, third grade spur gear 24 is installed on output shaft 3, to realize the transmission connection of transmission gear group 2 and output shaft 3.

[0031] The transmission gear set of the gear box adopts a worm and a helical gear cooperation, can obtain a larger transmission ratio, and is compact in structure and high in coincidence degree, so that the transmission gear set is more advantageous than a common gear set in strength, service life and space; the gear box structure is more compact than a worm and a worm gear mode, the lead angle of the worm and the helical gear is small, and the helical gear needs very large force to drive the worm reversely, so that the self-locking function can be realized.

[0032] In the preferred embodiment of the utility model, the first-stage worm 221 and the first-stage helical gear 222 rotate around the same axis, and the second-stage helical gear 231 and the second-stage spur gear 232 rotate around the same axis. Further, the angle between the axis of the input worm 21 and the axis of the first-stage helical gear 222 is 90°, and the angle between the axis of the first-stage worm 221 and the axis of the second-stage helical gear 231 is 90°. Through the above setting, the structure of the transmission gear set is very compact, further space is saved, and the volume of the product is reduced.

[0033] Further, the box body 1 comprises an upper cover 11 and a box shell 12 that are buckled to each other, the upper cover 11 is provided with an axle hole 111 at the top for the output shaft 3 to extend out of the box body 1 to connect a working machine, and the bottom of the box shell 12 is open for mounting a motor.

[0034] Optionally, the upper cover 11 and the box shell 12 are fixed by screws.

[0035] Further, the gear box further comprises a first bearing 4, the upper cover 11 is provided with a mounting groove 112 at the top for mounting the first bearing 4, and the output shaft 3 is mounted on the upper cover 11 through the first bearing 4.

[0036] Preferably, the first bearing 4 is a deep groove ball bearing.

[0037] Preferably, the gear box further comprises a first gasket 6, a second gasket 6', and a snap spring 7, the output shaft 3 extends out of the upper cover 11 through the axle hole 111, the first gasket 6, the first bearing 4, the second gasket 6', and the snap spring 7 in sequence.

[0038] Further, the gear box further comprises a first shaft pin 8 and a second shaft pin 9, the box shell 12 comprises a shell 121, a cavity 122 surrounded by the shell 121, a first mounting plate 1221 arranged in the middle of the cavity 122, a second mounting plate 1222 arranged at the bottom of the cavity 122, and a mounting cavity 1223 formed between the first mounting plate 1221, the second mounting plate 1222 and the shell 121; the third level spur gear 24 is arranged between the first mounting plate 1221 and the upper cover 11; the input worm 21 is arranged in the mounting cavity 1223, one end of the input worm 21 is mounted on the first mounting plate 1221, and the other end of the input worm 21 is used for being connected with the motor in transmission; the first level worm helical gear assembly 22 is fixed in the mounting cavity 1223 through the first shaft pin 8, the second level helical gear spur gear assembly 23 is fixed on the second mounting plate 1222 through the second shaft pin 9, and the second level spur gear 232 extends out of the mounting cavity 1223 and is engaged with the third level spur gear 24.

[0039] The second mounting plate 1222 is also used for mounting the gear box on the motor, and optionally, the second mounting plate 1222 can be fixed on the motor by screws, so as to realize the fixation of the gear box and the motor.

[0040] Further, the gear box further comprises a second bearing 5, the first mounting plate 1221 is provided with a mounting hole 12211 for mounting the second bearing 5, and the input worm 21 is mounted on the first mounting plate 1221 through the second bearing 5.

[0041] Preferably, the input worm 21 and the output shaft 3 are located on the same axis, and the input worm 21 and the output shaft 3 respectively extend into the two ends of the second bearing 5 and are in clearance fit with the second bearing 5. This makes the structure of the gear box more compact, further saves space and reduces the volume of the product.

[0042] Preferably, the material of the box body is aluminum alloy.

[0043] Further, the box body is made of aluminum alloy by die casting process, and has good surface quality and high dimensional accuracy.

[0044] In summary, the transmission gear set of the gear box adopts the cooperation of the worm and the helical gear, a larger transmission ratio can be obtained, and the structure is compact and the coincidence degree is high, so that the transmission gear set has more advantages in strength, service life and space compared with the ordinary gear set; the gear box structure of the utility model is more compact than the worm and worm gear mode, the lead angle of the meshing of the worm and the helical gear is small, and the force required for the reverse driving of the helical gear is very large, so that the self-locking function can be realized. When the gear box of the utility model works, the first-stage transmission and the second-stage transmission are driven by the worm and the helical gear, the third-stage transmission adopts the parallel shaft gear transmission, the worm and the helical gear are in point contact when meshing, the contact area is smaller than that of the ordinary gear meshing, the noise is also smaller, and meanwhile, the meshing of the worm and the helical gear can obtain a higher coincidence degree than the gear meshing, so that the transmission is more stable and the transmission noise is further reduced.

[0045] The above description is for the ordinary skilled in the art, and various corresponding changes and deformations can be made according to the technical scheme and technical concept of the utility model, and all the changes and deformations shall belong to the protection scope of the utility model claim.

Claims

1. A gearbox, characterized in that The gear box comprises a box body (1), a transmission gear set (2) installed in the box body (1), and an output shaft (3); one end of the output shaft (3) is in transmission connection with the transmission gear set (2), and the other end of the output shaft (3) extends out of the box body (1) to be connected with a working machine. The transmission gear set (2) comprises an input worm (21), a first-stage worm-helical gear assembly (22), a second-stage helical gear-straight gear assembly (23), and a third-stage straight gear (24); the first-stage worm-helical gear assembly (22) comprises a first-stage worm (221) and a first-stage helical gear (222) rotating synchronously, the second-stage helical gear-straight gear assembly (23) comprises a second-stage helical gear (231) and a second-stage straight gear (232) rotating synchronously; the input worm (21) is in mesh with the first-stage helical gear (222), the first-stage worm (221) is in mesh with the second-stage helical gear (231); the second-stage straight gear (232) is in mesh with the third-stage straight gear (24), and the third-stage straight gear (24) is installed on the output shaft (3), so that the transmission gear set (2) is in transmission connection with the output shaft (3). The first-stage worm (221) and the first-stage helical gear (222) rotate around the same axis, and the second-stage helical gear (231) and the second-stage straight gear (232) rotate around the same axis.

2. The gear box of claim 1, wherein, The angle between the axis of the input worm (21) and the axis of the first-stage helical gear (222) is 90°, and the angle between the axis of the first-stage worm (221) and the axis of the second-stage helical gear (231) is 90°.

3. The gear box of claim 2, wherein, The box body (1) comprises an upper cover (11) and a box shell (12) buckled to each other, the upper cover (11) is provided with a shaft hole (111) at the top for the output shaft (3) to extend out of the box body (1) to be connected with the working machine, and the bottom of the box shell (12) is open for installing a motor.

4. The gear box of claim 1, wherein, The gear box further comprises a first bearing (4), the upper cover (11) is provided with a mounting groove (112) at the top for mounting the first bearing (4), and the output shaft (3) is mounted on the upper cover (11) through the first bearing (4).

5. The gear box of claim 4, wherein, The first bearing (4) is a deep-groove ball bearing.

6. The gear box of claim 5, wherein, The gear box further comprises a first gasket (6), a second gasket (6'), and a snap spring (7), the output shaft (3) extends out of the upper cover (11) through the shaft hole (111), the first gasket (6), the first bearing (4), the second gasket (6'), and the snap spring (7) in sequence.

7. The gear box of claim 5, wherein, ​ 8. The gear case of claim 4, wherein, The gear box further comprises a first shaft pin (8) and a second shaft pin (9), the box shell (12) comprises an outer shell (121), a cavity (122) surrounded by the outer shell (121), a first mounting plate (1221) arranged in the middle of the cavity (122), a second mounting plate (1222) arranged at the bottom of the cavity (122), and a mounting cavity (1223) formed between the first mounting plate (1221), the second mounting plate (1222) and the outer shell (121); the third level straight gear (24) is arranged between the first mounting plate (1221) and the upper cover (11); the input worm (21) is arranged in the mounting cavity (1223), one end of the input worm (21) is mounted on the first mounting plate (1221), and the other end of the input worm (21) is used for being connected with the motor in transmission; the first level worm helical gear assembly (22) is fixed in the mounting cavity (1223) through the first shaft pin (8), the second level helical gear and straight gear assembly (23) is fixed on the second mounting plate (1222) through the second shaft pin (9), and the second level straight gear (232) extends out of the mounting cavity (1223) and is engaged with the third level straight gear (24).

9. The gear box of claim 8, wherein, The gear box further comprises a second bearing (5), the first mounting plate (1221) is provided with a mounting hole (12211) for mounting the second bearing (5), and the input worm (21) is mounted on the first mounting plate (1221) through the second bearing (5).

10. The gear box of claim 9, wherein, The input worm (21) and the output shaft (3) are located on the same axis, and the input worm (21) and the output shaft (3) respectively extend into the two ends of the second bearing (5) and are in clearance fit with the second bearing (5).

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