KR100671803B1 - Worm gear with a rotating ball tooth between the worm and the wheel - Google Patents

Abstract

The present invention is to reduce the friction between the worm (worm) and the worm wheel (worm wheel) in the worm gear (heat) to prevent heat generation and to prevent the wear of the material to improve the durability of the worm gear (worm gear) In order to guarantee and minimize the power loss, instead of the teeth of the worm wheel, the ball is used as a power transmission medium, and the conventional worm wheel tooth displacement is converted into a ball rolling operation. One high speed reducer.

Description

Worm gear with a rotating ball tooth between the worm and the wheel {omitted}

1 is a perspective view of a worm gear according to the present invention.

2 is a cross-sectional view of the worm gear

Explanation of symbols on the main parts of the drawings

1: worm 2: worm wheel

3: Wheel rotation axis 4: Ball

5: ball cup 6: ball orbit

7: housing

Its purpose is to reduce gear slip friction of worm gears to prevent heat generation and to reduce gear wear and power loss.

A gear reducer is a combination of several cylindrical gears of different sizes or planetary gearboxes, but the gear ratio is larger and the structure is complicated and the weight and volume are increased.In contrast, the worm reducer has a relatively simple structure. It is possible to decelerate, but due to the sliding friction of the tooth surface, it has disadvantages such as heat generating material wear, noise and power loss.

In order to solve the friction caused by the traction of the worm and the tooth surface of the wheel, the spherical surface of the worm tooth and the ball are used as a medium. One surface is in point contact, and the ball makes a rolling motion, and the hemispherical surface of the ball is formed in a ball cup and a spherical shape on the wheel. The contact was maintained and an oil film was formed between the spheres to minimize sliding friction.

Another option is to install a roller consisting of bearings instead of balls, but bearings are not only vulnerable to complex, bulky, and heavy load transmissions, but also increase manufacturing costs. The disadvantage of being inevitable is inevitable.

Fig. 1 is a cutting plane in which the cutting machine cuts (crosses) the axis of the worm 1 transversely, cuts (ends) the wheele rotating shaft 3 vertically, and passes the center point of the reducer (A-A 'in Fig. Half perspective view showing the position of the worm (1), wheel (2) and ball (4) when only one half of the gearhead is projected onto the cross section.
FIG. 2 is a cross-sectional view (BB ′ section of FIG. 1) crossing the wheel rotation axis 3 of the present reducer, terminating the axis of the worm 1 and passing through the center point of the reducer.
As shown in Figs. 1 and 2, the coupling of the worm 1 and the worm wheel 2 allowed the worm 1 to pass in parallel with the tangent between the U-shaped grooves installed on the circumference of the worm wheel 2; The shaft of (1) and the wheel (2) are supported by the housing of the bearing rotary shaft reducer with a shaft angle of 90 ° apart from each other.

As shown in FIG. 2, the U-shaped groove of the wheel 2 is installed on the outer circumference of the wheel 2 so that the worm 1 passes between the grooves and the ball 4 is fitted between the pitches on both sides of the worm 1. Determine the size of the groove so that the ball cup (5) is installed on the U-shaped inner wall at regular intervals (same as the worm (1) pitch distance).

The ball cup (5) forms a concave hemispherical surface to cover 1/2 of the ball (4), and the ball (4) is spherical in contact with the ball cup (5) and freely rotates in the cup. Rotational power is transmitted to the wheel shaft 3 by the rotational power of the ball 4 in place of the teeth.

In other words, the contact between the worm (1) and the worm wheel (2) is made of the intermediate medium of the ball (4) and the ball (4) replaces the teeth of the wheel in the conventional worm reducer to reduce the sliding friction between the teeth (4) ) To bend friction.
In order to solve the spherical sliding friction between the ball cup (5) and the ball (4) accompanying the bending motion of the ball (4), the radius of the sphere of the ball cup (5) and the ball (4) must be in contact with the ball surface. This should fit well and fill the inside of the housing with oil to ensure the formation of a film between the spheres.

As shown in FIG. 1, the installation of the ball cup 5 on the inner surface of the U-groove of the worm wheel 2 is spaced at the same distance as the pitch distance of the worm 1 along a tooth of a constant radius about the wheel rotation axis 3. Roll out as many ball cups (5) as the deceleration demands. Each ball cup (5) has a ball (4), and if you have 10 ball cups (5) on one side of the wheel (2), the reduction ratio is 1/10.

The operation of the worm (1) and the worm wheel (2) is that when the worm (1) rotates once, the balls (4), which are held between the pitches of the worm (1) as shown in Figure 1, are rotated by one pitch distance (3). When the worm (1) is continuously rotated, the balls (4) connected to the worm (1) leave the pitch of the worm (1) sequentially, and the balls (4) leaving the ball cup ( In order to prevent the departure from 5) as shown in Figure 2 is installed between the U-shaped grooves of the annular Ball track 6 except for the portion where the worm (1) passes.

That is, one end of the partially broken ring track 6 takes over the ball 4 leaving the pitch of the worm 1 and the other end of the ball track 6 causes the ball 4 to worm ( It will take over in 1).
Therefore, both ends of the ring-shaped ball track 6 is close to the worm (1) to maintain a minimum distance to minimize the noise when passing the ball (4) and smooth the bending movement.

Conventional worm gear (worm gear) is a relatively simple structure exhibits a high deceleration function, but there are many disadvantages such as heat generation, wear, power loss due to interdental friction, but the present invention is relatively simple but has the disadvantage of the conventional worm gear (worm gear) It is possible to manufacture a high reduction gear that is completely eliminated.

Claims (1)

In the worm gear, as shown in Fig. 2, the ball cup (5) is provided with a ball cup (5) which will hold the ball (4) in order to allow the balls (4) to contact each other on both sides of the worm (1). In the installation, the U-groove is formed on the outer circumferential surface of the wheel (2), and the tooth line of the worm wheel is connected to the inner side walls of the U-groove to make a hemispherical shape at intervals equal to the pitch distance of the worm (1). Ball ball (5) of the ball), and each ball cup (5) has a ball (4) so that the ball (4) and the ball cup (5) rotate freely in contact with the oil film on the spherical surface. Ball (4) bends in contact with Worm (1) and Ball (4). When Ball (4) leaves side of worm (1) by rotation of worm (1), Ball (4) The ball track 6, which is installed between the U-shaped groove spaces of the wheels to prevent deviation from the ball cup 5, does not touch the wheel 2 at a distance from both inner sides as shown in FIG. As shown in FIG. 2, the outer circumferential surface of the ball track 6 is a horseshoe-shaped track in which a part of the ring is cut off when viewed from the side of the wheel 1 as shown in FIG. 1 so as not to contact the orm (1). A worm gear having a rotating ball tooth between the worm and the wheel, characterized in that it is fixed to the circumferential inner wall of the housing 7.

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