KR102178023B1 - Enveloping worm combined with involute helical gear - Google Patents

Abstract

The present invention relates to a slim waist drum-shaped enveloping worm to be combined with an involute helical gear. According to the present invention, the slim waist drum-shaped enveloping worm to be combined with an involute helical gear is characterized in that a reduced diameter portion is formed, and a slim waist drum-shaped worm (2) in which a spiral worm gear tooth is formed is formed on the reduced diameter portion. According to the present invention, a turning effect can be maximized.

Description

Enveloping worm combined with involute helical gear {Enveloping worm combined with involute helical gear}

The present invention relates to a long solid enveloping worm coupled with an involute helical gear, and more particularly, to a circumferential contact surface of an involute helical gear as a power transmission device It is configured to be wrapped with a long solid worm, and the gear tooth of the long solid worm is composed of an arc-shaped concave shape tooth, and an involute helical gear and an enveloping worm ( Enveloping worm's interlocking structure improves contact ratio and contact area, minimizing impact, noise and vibration, and is combined with an involute helical gear that can maximize a large turning effect. It relates to a long solid enveloped worm.

In general, the power transmission system of a power transmission system is a gear having a tooth shape using an involute curve, a trajectory drawn by the end of a thread when unwinding a thread wound around a circle in a tight state.

Such a gear is a device whose teeth are formed on a circumference, and a gear formed on a circumference between two or more shafts is meshed to transmit rotation or power. When using a gear, the transmission of power or rotation is reliable and accurate. It can be transmitted in angular speed ratio.

Types of these gears include spur gears, helical gears, bevel gears, worm gears and worm gears.

In particular, worm gears have a significantly larger gear ratio with respect to general gears, and are special gears in which the input and output directions of power are at right angles.

In the case of a power transmission device composed of a worm and a worm gear, the worm is in the shape of a rod, whereas the worm gear in contact with the teeth of the worm has a disk shape, and the teeth of the worm gear are formed at intervals along the circumference, so the mutual relationship between the worm and the worm gear There is a problem in that the contact area becomes small, that is, the bite rate decreases.

That is, as shown in Fig. 6, the gear teeth of the worm and the worm gear are all formed in a convex shape tooth form.

As such, the conventional worm and worm gear have a narrow contact area of the meshing teeth, so the pressure applied to the gear tooth is local, so the pressure is high, so the torque is low and the efficiency as a worm and worm gear is low. .

In other words, there is a problem that the efficiency of the output rotational force is lowered, the durability and lifespan of the gear tooth is lowered, it is weak against shock, and noise and vibration increase.

In order to improve this problem, a long-hard worm, such as a hindley worm, is known as a power transmission device.

Long-solid worms are curved in a long-solid shape on the outer circumferential surface, and spiral grooves, such as spiral teeth, are formed in the curved area.The worm gear meshing therewith has a large number of teeth, so the area supporting the pressure of the teeth is larger than that of ordinary worms and worm gears. Since it becomes wider, it has a feature that can transmit large power while reducing wear of the gear.

However, conventional power transmission devices are limited to such long-solid worm and worm gear, and they cannot be used with various types of gears by taking full advantage of the characteristics of long-solid worm.

In addition, the conventional long-solid worm's gear tooth is also composed of a convex shape tooth form, so it cannot be wrapped around the circumferential contact surface of the worm gear wheel, so the contact ratio decreases. As the contact area is narrow, the pressure applied to the gear tooth is localized, so the pressure is high, so the torque is low and the efficiency is low.

One. Korean Registered Patent Publication No. 10-1482251 (announced on January 14, 2015). 2. Korean Registered Patent Publication No. 10-2035250 (announced on October 22, 2019). 3. Korean Registered Patent Publication No. 10-2007321 (announced on Aug. 5, 2019).

Accordingly, the present invention was invented to solve the above problem, and an object of the present invention is to be configured to be wrapped with a long solid worm on the circumferential contact surface of an involute helical gear as a power transmission device, and the long solid ( Concave shape The gear tooth of the worm is composed of an arc-shaped concave shape tooth, and the contact rate in the meshing structure of the involute helical gear and the enveloping worm (Contact ratio) and contact area are improved to minimize impact, noise and vibration, and provide a long solid enveloping worm combined with an involute helical gear that can maximize a large turning effect. Is in.

As an embodiment of a long solid enveloping worm coupled with an involute helical gear for achieving the object of the present invention,

Consisting of a worm shaft composed of a power input shaft, the outer diameter gradually decreases along the axial direction, and then forms a shaft diameter portion that increases again, and the shaft diameter portion constitutes a long-solid worm in which a helical worm gear tooth is formed. The gear tooth of a long solid worm is composed of a concave shape tooth made of an arc,

A power output shaft orthogonal to the worm shaft constitutes an involute helical gear coupled with the power output shaft,

The involute helical gear is configured to be wrapped with the long-solid worm on the circumferential contact surface of the involute helical gear, and the gear tooth and the convex shape of the long-solid worm of the arc-shaped concave shape The helical gear's gear teeth are combined to mesh.

The present invention is configured to be wrapped with the long-solid worm on the circumferential contact surface of the involute helical gear, and the involute is formed into a concave shape tooth made of arc shape and engaged with the gear tooth of the long-solid worm. The gear tooth of the helical gear is formed in a convex shape tooth, which is a combination of a concave shape tooth and a convex shape tooth, so the contact ratio and the contact area ( Because the contact area) is wide, the pressure applied to the gear tooth is widely distributed, so the applied pressure (PH) is low, so the torque is high and a large turning effect can be generated, and the efficiency is increased. I can.

1 and 2 are external perspective views of a "long solid enveloping worm coupled with an involute helical gear" according to the present invention.
3 is a front view of a "long solid enveloping worm coupled with an involute helical gear" according to the present invention.
4 is a cross-sectional view of a "long solid enveloping worm coupled with an involute helical gear" according to the present invention.
5 is a partially enlarged explanatory view of a "long solid enveloping worm coupled with an involute helical gear" according to the present invention.
6 is a partially enlarged explanatory view of a worm and a worm gear of the prior art.

Hereinafter, it will be described in detail according to the accompanying drawings, shown as preferred embodiments as follows.

The terms defined in the description of the present invention are defined in consideration of functions or forms in the present invention, and should not be understood as limiting technical elements of the present invention.

The present invention will be described in detail in the text of the bar, implementation (態樣, aspect) (or embodiment) that can apply various changes and can have various forms. However, this is not intended to limit the present invention to a specific form of disclosure, and it should be understood that all changes, equivalents, and substitutes included in the spirit and scope of the present invention are included.

In addition, the components in each drawing are expressed by exaggeratingly large (or thick) or small (or thin) or simplified the size or thickness in consideration of the convenience of understanding, but this limits the scope of protection of the present invention. It shouldn't be.

The terms used in the present specification are only used to describe specific embodiments (sun, 態樣, aspect) (or examples), and are not intended to limit the present invention.

Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. .

The'long-solid enveloping worm coupled with an involute helical gear' of the present invention will be described with reference to FIGS. 1 to 5 attached.

Long-going worm (2) composed of a worm shaft (1) composed of a power input shaft to form a shaft diameter portion whose outer diameter gradually decreases along the axial direction and then increases again, and the shaft diameter portion has a spiral worm gear tooth (2). ), but the gear tooth (3) of the long-solid worm is composed of a concave shape tooth made of an arc (4), and a power output shaft perpendicular to the worm shaft (1) is configured, and It constitutes an involute helical gear 5 coupled to the power output shaft, and is configured to be wrapped with the long-solid worm on the circumferential contact surface of the involute helical gear 5, and a concave shape made of the arc 4 The gear tooth (3) of the long solid worm (2) of the tooth) and the gear tooth (6) of the helical gear (5) of the convex shape tooth are engaged in mesh.

Although the worm shaft 1 is the power input shaft and the involute helical gear 5 is described as a power output shaft, the worm shaft 1 may be the power output shaft and the involute helical gear 5 can be used as the power input shaft.

And the long-solid worm (2) and the involute helical gear (5) are preferably used as carbon steel, and if carbon steel is used as a material, it is suitable for high torque and low speed. Do.

The present invention as described above is the gear tooth 3 of the long-solid worm 2 of the concave shape tooth made of the arc 4 and the gear tooth of the helical gear of the convex shape tooth. (Gear tooth) 6 is configured to be engaged in engagement, and is configured to be wrapped with the long-solid worm on the circumferential contact surface of the involute helical gear 5, so that the contact ratio and the contact area are It is improved, thus minimizing impact, noise and vibration, and maximizing a large turning effect.

That is, as shown in Fig. 5, the gear tooth 3 of the long-solid worm 2 is formed in a concave shape tooth made of an arc 4 and is engaged with the involute helical gear 5 ) Of the gear tooth (6) is formed into a convex shape tooth, which is a combination of a concave shape tooth and a convex shape tooth, thereby increasing the contact ratio. Since the contact area is wide, the pressure applied to the gear tooth is widely distributed, and the applied pressure (PH) is low, resulting in high torque and high efficiency.

The biting rate of the gear teeth 3 of the long-solid worm 2 of the present invention and the gear teeth 6 of the involute helical gear 5 as described above ranges from 6.6 to 10.7, whereas The bite rate (contact rate) of the conventional worm and the worm gear is 2.96, so that the biting rate (contact rate) of the gear tooth according to the present invention is 2.23 to 3.62 times.

The results of performing the long-solid worm reducer test of the present invention as described above are shown in the table below.

The purpose of the above test is to check the performance (efficiency, temperature) of long-solid worm and worm wheel.

* The test equipment is a Seulgiter hydraulic dynamo tester,

* Test conditions are gear break-in operation at the beginning of the initial test (30 minutes each in the direction of “CW” and “CCW” based on the input shaft, input 1800rpm, no load),

As for the output torque, check the efficiency and temperature change Δt according to the load rate based on 18.5kg·m.

* In the case of input shaft rotation direction “CW”, the output shaft rotation direction is “CCW” and the thrust direction occurs in the opposite side of the motor.

* In case of input shaft rotation direction “CCW”, output shaft rotation direction is “CW” and thrust direction occurs to the motor side.

As described above, the efficiency of long-solid worm is Max. It is about 72% level, and when comparing the efficiency of the existing worm, it can be seen that it has improved about 14% from 56% to 70%, and at 100% load (about 18.5kg·m) Max. The temperature is 105℃ for the input bearing part (Δt=90.0℃), the same output torque, and the max. The temperature is 87.7°C (Δt=71.7°C). The amount of temperature change drops by about 20℃.

And after the load operation, the contact rate of the worm wheel's tooth surface is about 35 to 40% of the entire tooth surface, and as a result of testing the performance, it is more efficient than the existing long-going worm product and generates a higher output torque.

The present invention as described above is configured to be wrapped with the long-solid worm on the circumferential contact surface of the involute helical gear, and the gear tooth of the long-solid worm is formed into a concave shape tooth made of an arc, and is engaged with it. The gear tooth of the involute helical gear is formed into a convex shape tooth to form a combination of a concave shape tooth and a convex shape tooth. Due to the large contact area, the pressure applied to the gear tooth is widely distributed, and the applied pressure (PH) is low, so the torque is high and a large turning effect can be generated. It can increase efficiency.

1: worm shaft 2: long solid worm
3: Gear tooth of long-type worm 4: Arc-type
5: involute helical gear 6: gear teeth of helical gear

Claims (3)

delete It is composed of a worm shaft 1 composed of a power input shaft, and forms a shaft diameter portion whose outer diameter gradually decreases and then increases in the axial direction, and a long solid shape in which a spiral worm gear tooth is formed in the shaft diameter portion.形) Compose the worm (2),
The gear tooth (3) of the long solid worm is composed of a concave shape tooth made of an arc (4),
A power output shaft orthogonal to the worm shaft 1 constitutes an involute helical gear 5 coupled with the power output shaft,
The involute helical gear 5 is configured to be wrapped with the long solid worm on the circumferential contact surface of the involute helical gear 5,
A gear tooth 3 of a concave shape tooth consisting of the arc (4) and a helical gear of a convex shape tooth (5) The gear tooth (6) of
The long solid worm (2) and the involute helical gear (5) are made of carbon steel, and the contact rate of the tooth surface is 35 to 40% of the entire tooth surface. Long solid enveloping worm combined with the characteristic involute helical gear. delete

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