CN203892533U - Worm and worm gear transmission device - Google Patents

Abstract

A worm and worm gear transmission device comprises a shell. A worm (300) engaged with a worm gear (700) is arranged in an accommodating cavity (120) in the shell, one end of a transmission shaft of the worm is connected with a first driving device, the worm gear is connected with an output device and driven to rotate through a second driving device, an air inlet (111) and an air outlet (101) are formed in the shell, and airflow enters the shell from the air inlet (111) and is discharged from the air outlet (101) under the action of an impeller. The worm and gear transmission device is simple in structure and low in cost; an air circulation system is formed inside the bottom shell of the transmission device, heat generated from engaging motion of the worm gear and the worm can be effectively discharged, heat radiation effect is good, and operation efficiency is high.

Description

Worm Gears

technical field

The utility model relates to a worm gear transmission device, which belongs to the technical field of mechanical manufacturing.

Background technique

Fig. 1 is an exploded view of an existing worm gear transmission; Fig. 2 is a cross-sectional view of an existing worm gear; Fig. 3 is a top view of Fig. 2 . As shown in Figures 1 to 3, the existing worm gear transmission device includes a bottom case 100 and an upper cover 110, the transmission shaft 200 is rotatably fixed on the bottom case 100 through ball bearings 500 arranged at both ends, and one end is fixed on the bottom case 100, the other end protrudes out of the bottom shell 100 and is fixed with the pulley 600. The worm 300 is fixed on the transmission shaft 200 through the elastic pin 400 , and the bottom shell 100 is provided with an accommodating cavity 120 , and the worm wheel 700 intermeshing with the worm 300 is fixed in the accommodating cavity 120 through the gear shaft 710 . The accommodating cavity 120 is also provided with an output gear 800 , and the transmission gear 720 is integrally provided on the worm gear 700 , and the output gear 800 and the transmission gear 720 are meshed with each other.

As shown in FIG. 1 to FIG. 3 , in the worm gear, the worm wheel 700 and the worm 300 generate a lot of heat during meshing movement, mainly due to the sliding friction between the worm and the worm wheel. If plastic is used, the physical properties of the plastic will decrease with the increase of temperature, which will eventually lead to thermal wear of the worm gear, shorten the service life, and even lead to the rapid failure of the kinematic pair.

In order to solve the above problems, the bottom shell 100 surrounding the worm wheel 700 and the worm 300 is usually an aluminum bottom shell, so that the heat generated by the worm gear and worm during the movement can be quickly dissipated to achieve a cooling effect. However, since the cost of the aluminum bottom case is much higher than that of the plastic bottom case, it cannot meet the demand for cost reduction. Therefore, it is urgent to develop a cooling solution with low cost and excellent effect.

Utility model content

The technical problem to be solved by the utility model is to provide a worm and gear transmission device for the deficiencies of the prior art. The structure of some components for realizing heat dissipation is very simple. Cooperating with the air inlet and the air outlet on the bottom shell, the transmission device An air circulation system is formed inside the bottom shell, which effectively removes the heat generated by the meshing movement of the worm gear and worm, and improves the problem of excessive temperature in the bottom shell of the transmission device at a lower cost. The heat dissipation effect is good and the work efficiency is high.

The technical problem to be solved of the utility model is achieved by the following technical solutions:

A worm gear transmission device, comprising a housing, a worm and a worm wheel meshing with each other are installed in the accommodation cavity in the housing, a first driving device is connected to one end of the transmission shaft of the worm, and the worm gear is connected to the output device , an impeller is also provided in the accommodating cavity, the impeller is connected with the second driving device, and rotates under the driving of the second driving device, and the housing is provided with an air inlet and an air outlet, Under the action of the rotation of the impeller, the airflow enters the casing from the air inlet and is discharged from the air outlet.

The specific setting position of the impeller in the housing can be adjusted according to the needs of the actual structure setting, for example, the impeller can be arranged on the transmission shaft of the worm; or, the impeller can also be arranged on the transmission shaft of the worm wheel superior;

In order to save energy, the first driving device and the second driving device may be the same driving device.

The air inlet and the air outlet are respectively located on both sides of the meshing position of the worm and the worm wheel;

Alternatively, the air inlet is located above the meshing position of the worm and the worm gear, and the air outlet is located on one side of the meshing position of the worm and the worm gear.

Further, for the convenience of exhausting, the opening position of the air outlet corresponds to the fixed position of the impeller.

At the same time, according to the needs of the displacement, there are also certain requirements for the size of the air inlet and the air outlet. The length of the air outlet along the direction of the transmission shaft is greater than the axial length of the impeller; the area of the air inlet Greater than or equal to the area of a single impeller blade.

In addition, the output device includes an output gear and transmission teeth integrally provided on the worm wheel, and the output gear and the transmission teeth mesh with each other.

The driving device includes an external power source and a pulley connected thereto, and the pulley is fixed on the transmission shaft.

In order to improve work efficiency, the air inlet is also connected with an external blower unit.

To sum up, the utility model has simple structure and low cost. An air circulation system is formed inside the bottom shell of the transmission device, which can effectively remove the heat generated by the meshing movement of the worm wheel and the worm, and has good heat dissipation effect and high working efficiency.

The technical solutions of the present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the exploded diagram of existing worm gear transmission;

Fig. 2 is the cross-sectional view of existing worm gear;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is the explosion diagram of the utility model;

Fig. 5 is a sectional view of the utility model;

Figure 6 is a top view of Figure 5;

Fig. 7 is the left view of Fig. 6;

Fig. 8 is a partial sectional view of the utility model;

FIG. 9 is a cross-sectional view along line A-A of FIG. 8 .

Detailed ways

Fig. 4 is an exploded view of the utility model; Fig. 5 is a cross-sectional view of the utility model; Fig. 6 is a top view of Fig. 5, and Fig. 6 omits the output gear 800 in Fig. 4; Fig. 7 is a left side view of Fig. 6 . As shown in Fig. 4 to Fig. 7, the utility model provides a worm gear and worm transmission device with a heat dissipation unit, generally speaking, it includes a housing, and the intermeshing worm 300 and Worm wheel 700, one end of the transmission shaft of the worm is connected with a first driving device, and the worm wheel is connected with an output device. The accommodating cavity 120 is also provided with an impeller 900, the impeller is connected with the second driving device, and rotates under the driving of the second driving device, and the housing is provided with an air inlet 111 and an outlet. Air port 101, under the action of the rotation of the impeller, the air flow enters the casing from the air inlet and is discharged from the air outlet. Specifically, the housing includes a bottom case 100 and an upper cover 110. The transmission shaft 200 is rotatably fixed on the bottom case 100 through ball bearings 500 arranged at both ends, one end is fixed in the bottom case 100, and the other end protrudes It extends out of the bottom case 100 and is fixed with the pulley 600 . The worm 300 is fixed on the transmission shaft 200 through the elastic pin 400 , and the worm wheel 700 meshing with the worm 300 is fixed in the accommodating cavity 120 through the gear shaft 710 . The accommodating cavity 120 is also provided with an output gear 800 , and the transmission gear 720 is integrally provided on the worm gear 700 , and the output gear 800 and the transmission gear 720 are meshed with each other. Meanwhile, an impeller 900 is arranged coaxially with the worm 300 in the accommodation space between one end of the worm 300 fixed on the bottom case 100 and the bottom case 100 . An air inlet 111 is opened on the upper cover 110 , and an air outlet 101 is opened on the bottom case 100 .

In order to save energy, the first driving device and the second driving device may be the same driving device. That is to say, the impeller can be driven by the driving device for driving the worm gear, or an independent driving device can be provided.

For better heat dissipation, the air inlet 111 and the air outlet 101 are respectively located on both sides of the meshing position of the worm and the worm gear, so that the heat dissipation airflow formed between the air inlet 111 and the air outlet 101 flows through the meshing place of the worm and the worm gear . Alternatively, the air inlet can also be arranged above the meshing position of the worm and the worm gear, and the air outlet is located on one side of the meshing position of the worm and the worm wheel. Those skilled in the art can select the positions of the air inlet 111 and the air outlet 101 according to actual needs. Further, for the convenience of exhausting, the opening position of the air outlet 101 corresponds to the fixed position of the impeller. In this embodiment, the air outlet 101 is opened on the bottom shell 100 on one radial side of the impeller 900 .

At the same time, according to the needs of the displacement, there are also certain requirements for the size of the air inlet and the air outlet. The length of the air outlet along the direction of the transmission shaft is greater than the axial length of the impeller; the area of the air inlet Greater than or equal to the area of a single impeller blade. More specifically, as shown in Figure 9, a and b in the figure represent the length and width of the air outlet respectively, and other letters and their meanings include: c is the maximum distance from the top of the impeller to the side wall, d is the width of the impeller, e is the height of the impeller blades, and f is the minimum distance from the top of the impeller to the sidewall. The relationship between the above parameters includes: the area of the air outlet=a*b≥a*(c+e), where a>d, c>f, b≥(c+e).

In addition, the output device includes an output gear and transmission teeth integrally provided on the worm wheel, and the output gear and the transmission teeth mesh with each other. The driving device includes an external power source and a pulley connected thereto, and the pulley is fixed on the transmission shaft.

The specific setting position of the impeller in the housing can be adjusted according to the needs of the actual structure setting, for example, the impeller can be arranged on the transmission shaft of the worm; or, the impeller can also be arranged on the transmission shaft of the worm wheel superior. Specifically, it is a better transmission mode that the impeller is set on the transmission shaft of the worm. The worm drives the impeller to rotate, the speed is high, and the size of the impeller can be designed to be smaller; the impeller can also be coaxial with the worm wheel, and the worm wheel drives the impeller to rotate. The impeller can be made larger and the rotational speed is relatively small; in addition, the impeller can also be driven by an additional small motor. At this time, the driving devices of the impeller and the worm gear are different.

As shown in Fig. 4 to Fig. 7, the working process of the worm gear and worm gear with cooling unit provided by the utility model is as follows: the external power source (not shown in the figure) is connected with the pulley 600, and the pulley 600 drives the transmission The shaft 200 rotates, and the worm 300 and the impeller 900 fixed on the transmission shaft 200 rotate synchronously. The worm 300 and the worm wheel 700 mesh with each other, and the worm wheel 700 transmits the power through the meshing of the integral transmission gear 720 and the output gear 800 . According to the output requirements of the transmission device, the output gear 800 may also be unnecessary. Compared with FIG. 6 and FIG.

Fig. 8 is a partial sectional view of the utility model; Fig. 9 is a sectional view of A-A of Fig. 8 . As shown in Figure 8 and in conjunction with Figure 9, the principle that the utility model can effectively assist in cooling is that the utility model is fixedly connected to the impeller 900 on the transmission shaft 200 of the worm 300, and the power generated by the movement of the worm wheel 700 and the worm 300 drives and worm The 300 coaxial impeller 900 moves together. As the impeller 900 rotates at a high speed, the negative pressure between the blades of the impeller 900 and the sealing chamber between the bottom shell 100 gradually increases, forming a partial vacuum, and a large amount of air is provided in the bottom shell 100. The air inlet 111 on the top is sucked in, and the sucked air is quickly discharged out of the bottom shell 100 through the air outlet 101 under the action of the centrifugal force of the impeller 900 and the partial vacuum, so the air is continuously sucked in from the air inlet 111 and spit out from the air outlet 101 , forming an air circulation system. The heat generated by the meshing of the worm wheel 700 and the worm 300 is discharged out of the bottom case 100 through the air outlet 101 along with the flow of air, thereby achieving the effect of cooling the inside of the transmission device. B in FIG. 8 and FIG. 9 represents the flow direction of the airflow in the casing.

In order to improve work efficiency, the air inlet can also be connected with an external blower unit. In addition to adopting the negative pressure of the air inlet in the above-mentioned embodiments to inhale air, air can also be blown in by a blower. The air inlet and the air outlet of the present utility model can be arranged in various positions, except for the setting method of this embodiment, it is also possible to be arranged in other places, so that the airflow between the air inlet and the air outlet flows through the worm wheel Worm mesh is preferred. According to different impellers, such as using centrifugal fan, axial fan, mixed flow fan, etc., the setting position of the air outlet should be adjusted accordingly.

To sum up, the utility model has simple structure and low cost. An air circulation system is formed inside the bottom shell of the transmission device, which can effectively remove the heat generated by the meshing movement of the worm wheel and the worm, and has good heat dissipation effect and high working efficiency.

Claims (12)

1. a worm gearing, comprise housing, intermeshing worm screw (300) and worm gear (700) are installed in the accommodating cavity (120) in housing, one end of the transmission shaft of described worm screw is connected with the first drive unit, described worm gear is connected with output unit, it is characterized in that, in described accommodating cavity (120), be also provided with impeller (900), described impeller is connected with the second drive unit, and rotate under the driving of described the second drive unit, on described housing, offer suction port (111) and air outlet (101), under the turning effort of impeller, air-flow enters housing and (101) discharge from air outlet from suction port (111).

2. worm gearing as claimed in claim 1, is characterized in that, described impeller (900) is arranged on the transmission shaft of described worm screw.

3. worm gearing as claimed in claim 1, is characterized in that, described impeller (900) is arranged on the transmission shaft of described worm gear.

4. worm gearing as claimed in claim 1, is characterized in that, described the first drive unit and the second drive unit are same drive unit.

5. the worm gearing as described in claim 2,3 or 4 any one, is characterized in that, described suction port (111) and air outlet (101) lay respectively at the both sides of worm and wheel engaging position.

6. the worm gearing as described in claim 2,3 or 4 any one, is characterized in that, described suction port (111) is positioned at the side that the top of worm and wheel engaging position, described air outlet (101) are positioned at worm and wheel engaging position.

7. the worm gearing as described in claim 5 or 6, is characterized in that, described air outlet (101) to offer position corresponding with the fixed position of described impeller (900).

8. worm gearing as claimed in claim 7, is characterized in that, described air outlet (111) are greater than the axial length of impeller along the axial length of transmission.

9. worm gearing as claimed in claim 7, is characterized in that, the area of described suction port (111) is more than or equal to the area of monolithic impeller blade.

10. worm gearing as claimed in claim 1, it is characterized in that, described output unit comprises output gear (800) and is wholely set the driving cog (720) on described worm gear (700), and described output gear and described driving cog are intermeshing.

11. worm gearings as claimed in claim 1, is characterized in that, described drive unit comprises external power supply and coupled belt pulley (600), and described belt pulley is installed on described transmission shaft (200).

12. worm gearings as claimed in claim 1, is characterized in that, described suction port (111) is located to be also connected with external blower group.