Rolling friction worm gear reducer with automatic ball distribution between tooth surfaces

Abstract

The application discloses a rolling friction worm reducer with automatic distribution of balls between transmission tooth surfaces, and relates to a worm reducer. The original worm reducer is widely applied due to a large transmission ratio and compact structure. However, the relative sliding speed between the transmission contact tooth surfaces of the worm and the worm wheel is large, the tooth surface friction loss is serious, and the transmission efficiency is low. The application adopts small balls as power transmission at any time between the transmission interfaces of the worm screw and the worm tooth, so as to change the sliding friction between the transmission tooth surfaces of the original worm reducer into rolling friction, and greatly improve the transmission efficiency of the worm reducer.

Description

[0001] Technical Field: This invention relates to gear transmission devices, and more particularly to worm gear reducers.

[0002] Background technology: For a long time, worm gear reducers in the field of gear transmission have been widely used due to their large transmission ratio (speed ratio) and compact structure. However, the large sliding friction loss on the transmission surfaces of the worm gear teeth and the worm helical teeth has significantly reduced their transmission efficiency.

[0003] Summary of the Invention: To overcome the shortcomings of the existing methods, this invention is inspired by an ancient method used to catch thieves at night. Soybean oil was poured at a crossroads the thieves were sure to pass through, and then mung beans were scattered on top of them. The thieves would fall flat on their faces when they reached this point. Therefore, by filling the transmission interface between the worm gear helical teeth and the worm wheel teeth with small ball bearings and injecting lubricating oil, the sliding friction between the transmission interface between the worm gear helical teeth and the worm wheel teeth can be transformed into rolling friction, greatly reducing the frictional resistance of the worm gear reducer and improving the transmission efficiency.

[0004] The technical solution adopted in this invention is:

[0005] Small balls, which transmit power, are constantly distributed between the transmission interfaces of the worm helical teeth and the worm wheel teeth. When the rolling friction worm gear reducer of the present invention, which automatically distributes balls between the transmission tooth surfaces, is in operation, the worm helical teeth push these small balls between the transmission interfaces to transmit power to the worm wheel teeth, causing the worm wheel shaft to rotate. This transforms the sliding friction worm gear reducer into a rolling friction worm gear reducer.

[0006] Compared with the prior art, the beneficial effects of the present invention are:

[0007] Existing worm gear reducers suffer from low transmission efficiency due to sliding friction at the interface between the worm helical teeth and the worm wheel teeth. However, the rolling friction worm gear reducer of this invention, with its transmission tooth surfaces automatically filled with small balls, achieves rolling friction at the interface between the worm helical teeth and the worm wheel teeth, thus significantly improving the transmission efficiency. This is particularly important for energy saving in worm gear reducers used in battery-powered electric doors and robots. Attached Figure Description

[0008] Figure 1 A front structural diagram of a rolling friction worm gear reducer that automatically fills the space between transmission teeth with balls.

[0009] Figure 2 A side view of a rolling friction worm gear reducer that automatically fills the space between transmission teeth with balls.

[0010] Figure 3A schematic diagram of the inlet structure of the small ball inlet between the worm helical teeth and the worm wheel teeth of a rolling friction worm gear reducer that automatically fills the tooth surfaces with balls.

[0011] In the above diagrams, 1 represents the worm, 2 represents the worm helical teeth, 3 represents the small ball bearing, 4 represents the worm gear teeth, 5 represents the worm gear, and 6 represents the worm gear tooth small ball bearing inlet.

[0012] Figure 1 As shown in the abstract figure. Detailed Implementation

[0013] When designing and manufacturing the worm helical teeth (2) and worm wheel teeth (4) of a worm gear reducer, the following measures should be taken: 1. Ensure that a space slightly larger than the diameter of the small ball (3) is left on both sides of the interface between the worm helical teeth and the worm wheel teeth, so that the small ball can transmit power within this space; 2. A space slightly larger than the diameter of the small ball should be left between the tip of the worm helical teeth and the bottom of the worm wheel tooth groove, and between the bottom of the worm helical tooth groove and the tip of the worm wheel tooth, so that the ball can transmit power within this space. 3. The ball can flow in this space; 4. The ball inlet of each worm gear tooth (4) that bears the driving force from the worm helical tooth (2) should be slightly cut into a bevel shape so that the worm gear tooth and the worm helical tooth form a small horn mouth (6) to facilitate the small ball to enter the interface to replenish the small ball that exits the interface; 5. Fill the worm gear with the small balls (3) and inject lubricating oil to wet the small balls so that the small balls fill the gaps between the worm helical tooth, the worm gear teeth and the worm gear reducer.

[0014] Usage process

[0015] Because the spaces in the worm helical tooth grooves and worm wheel tooth grooves of this rolling friction worm gear reducer are filled with small balls lubricated with lubricating oil, when the worm rotates counterclockwise, some of the small balls in the worm wheel tooth grooves and worm helical tooth grooves that are about to engage with the worm helical teeth are gradually discharged from the transmission interface due to the pressure of the worm helical teeth and worm wheel teeth. Finally, only one layer of small balls remains between the transmission interfaces to transmit power, driving the worm wheel to rotate clockwise. As the worm helical teeth rotate, the small balls between the transmission interfaces, after transmitting power, gradually roll out of the transmission interfaces in the direction of the helical teeth's movement. Meanwhile, the small balls outside the small bell-shaped opening are gradually replenished between the transmission interfaces due to the pressure of the outer balls to transmit power. Figure 1 , Figure 2 and Figure 3 .

[0016] When the worm rotates clockwise, the relationship between the worm's helical teeth, the worm wheel teeth, and the small balls is the same as when the worm rotates clockwise, except that the direction of motion of the worm wheel teeth and the small balls changes accordingly. (Details omitted here.)

Claims

1. A rolling friction worm gear reducer with automatically distributed balls between the transmission tooth surfaces, relating to worm gear reducers, wherein the less friction loss between the worm helical teeth and the worm wheel teeth during the reduction process, the higher the transmission efficiency, characterized in that: Small ball bearings, which transmit power, are always present between the transmission interfaces of the worm gear helical teeth and the worm wheel teeth.

2. The rolling friction worm gear reducer with automatically distributed balls between the transmission tooth surfaces according to claim 1, characterized in that: The inlet of the worm gear tooth into the small ball bearing end is made into a small flared opening when it receives power from the worm helical teeth.

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