KR20180000549U - assembling structure of gear shaft and power transmission gear - Google Patents

Abstract

A coupling structure of a gear shaft and a power transmission gear is disclosed. According to the combination structure of the gear shaft and the power transmission gear according to the present invention, it is possible to smoothly operate the gears by preventing scratches, scratches and corrosion of the gear shaft generated between the gears and the gear shaft, By increasing the durability of the gearbox without machining, it is possible to improve the reliability of the product, prevent the occurrence of environmental pollution due to unnecessary plating or machining, and reduce the number of parts and the production process to increase the productivity.
In addition, it is possible to eliminate the wear-in time between a plurality of power transmission gears and gear shafts, to discharge abrasive dust generated during the initial or long-term operation of the operation to the outside, It is possible to prevent the lubricating member from deviating to the outside in a high-pressure environment, and to secure a circulating path through which the lubricating member can infiltrate again.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear shaft and a power transmission gear,

The present invention relates to a coupling structure between a gear shaft and a power transmission gear, and more particularly, to a gear shaft which prevents scratches, scratches and corrosion of a gear shaft occurring between gears and gear shafts, To a coupling structure of a gear shaft and a power transmission gear that can ensure reliability.

The power transmission gear is a gear that changes the power (rotational power) and the rotational speed generated by a driving part of a motor or the like in accordance with a driving force characteristic required by a power demander or transmits the same directly to a power consumer.

Generally, gears are formed by rotating equally spaced projections (gear teeth) on a disk-like rotating body sandwiched between two or more rotating shafts to transmit rotation or power, And can transmit the motion or power without loss of.

These gears are widely used in various machine structures because they can transmit power and rotation reliably, can be transmitted at an accurate speed ratio, are relatively simple in structure, have less power loss, and have a longer service life.

A spur gear having an axis parallel to the axis of the gear is most widely used. A gear parallel to the spur gear and a gear sloped to the spur gear are referred to as helical gears, Because of this smoothness and low noise, helical gears are used where these characteristics are required.

On the other hand, the two-stage structure power transmission gear is formed by integrally forming teeth (teeth) having different outer diameters. In order to prevent the scrach of the gear shaft and the subsequent fretting corrosion, the conventional two-stage structure power transmission gear is provided with a bush of an abrasion resistant material, Improves internal wear or presses plated bushings to prevent wear and corrosion.

However, such a conventional two-stage structure power transmission gear has a problem that additional parts and assembly (press-fitting) processes are added because the bush is further press-fitted, and there is a problem in that, The scratch of the gear shaft occurs, and as the operation time elapses, the scratch range becomes wider and eventually causes abrasion and corrosion.

When the power transmission gear rotates in the gear box, a high temperature due to high pressure is generated between the inner diameter of the power transmission gear and the gear shaft, and grease or oil between the inner diameter of the power transmission gear and the gear shaft, There is a problem that the lubrication member such as the piston is detached from the sliding surface.

In addition, when the inner diameter surface of the power transmission gear and the gear shaft are worn, the power transmission gear is inclined, and the distance between the power transmission gears increases the noise of the gearbox and causes breakage of the power transmission gear .

Therefore, there is a need for a power transmission gear that can delay the occurrence of scratches, abrasions and corrosion, increase the service life of the gearbox without using additional parts or machining, and prevent environmental contamination due to unnecessary plating or machining. .

Embodiments of the present invention seek to smooth the operation of gears by preventing scratches, scratches and corrosion of gear shafts occurring between gears and gear shafts.

In addition, we intend to improve the reliability of the product by increasing the service life of the gearbox without using or machining additional parts.

In addition, it is intended to prevent the occurrence of environmental pollution due to unnecessary plating and processing, and to increase the productivity by reducing the number of parts and the production process.

In addition, it is desired to eliminate the time for tampering between a plurality of power transmission gears and gear shafts, and to discharge abrasion dust generated at the time of operation or long-term operation to the outside.

Further, it is desirable to prevent the lubricating member from escaping to the outside in an environment of high temperature and high pressure generated between the inner diameter surface of the power transmission gear and the gear shaft, and to secure a circulating path through which the lubricating member can infiltrate again.

According to one aspect of the present invention, there is provided a gear shaft; A power transmission gear having a hollow portion through which the gear shaft is inserted; At least one outer diameter groove formed on an outer peripheral side of the gear shaft; And a lubricating member fixed to the outer circumferential groove and fixed to the outer circumferential groove to absorb abrasive dust generated on a friction surface between the power transmission gear and the gear shaft. Can be provided.

The outer diameter groove may be formed in a spiral shape having a predetermined pitch.

The coupling structure of the gear shaft and the power transmission gear according to the present invention may further include a gear housing in which one side of the gear shaft is inserted and is coupled to the power transmission gear.

The coupling structure of the gear shaft and the power transmission gear according to the present invention is formed at a portion where the gear housing and the power transmission gear are coupled, and may further include a communication groove for circulating the dust and lubricating member.

The outer diameter of the gear shaft may be 5 mm to 20 mm.

The width of the outer diameter groove may be 0.5 mm to 3 mm.

The depth of the outer diameter groove may be 1% to 30% of the outer diameter of the gear shaft.

The power transmission gear includes: a first body having a first toothed portion formed along a circumferential direction; And a second body provided on one side of the first body and having a different outer diameter from the first body and having a second tooth portion.

The lubrication member may be made of any one of semi-solid grease, grease, and oil.

The consistency of the semi-solid grease may be 2.0 to 3.0.

Embodiments of the present invention can prevent scratching, scratching and corrosion of the gear shaft occurring between the gear and the gear shaft, thereby facilitating the operation of the gear.

In addition, the reliability of the product can be improved by raising the service life of the gearbox without using or machining additional parts.

In addition, it is possible to prevent the occurrence of environmental pollution due to unnecessary plating or processing, and to reduce the number of parts and the production process, thereby increasing the productivity.

In addition, it is possible to eliminate the time for treading between the plurality of power transmission gears and the gear shaft, and to discharge the abrasion dust generated during the initial operation or the long-term operation to the outside.

Further, it is possible to prevent the lubricating member from escaping to the outside in an environment of high temperature and high pressure generated between the inner diameter surface of the power transmission gear and the gear shaft, and to secure a circulation path through which the lubricating member can infiltrate again.

1 is a perspective view of a power transmission gear according to an embodiment of the present invention;
2 is a plan view of a power transmitting gear according to an embodiment of the present invention;
3 is a cross-sectional view of the power transmission gear according to one embodiment of the present invention
4 is a perspective view of a gear shaft according to an embodiment of the present invention;
5 is a side view of a gear shaft according to an embodiment of the present invention;
6 is a side view showing a state in which a gear shaft and a gear housing are combined according to an embodiment of the present invention
7 is a side view showing a state in which a gear shaft and a power transmission gear are combined according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of this invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a perspective view of a power transmission gear according to an embodiment of the present invention, FIG. 2 is a plan view of a power transmission gear according to an embodiment of the present invention, FIG. 3 is a perspective view of a power transmission gear according to an embodiment of the present invention, Fig. FIG. 4 is a perspective view of a gear shaft according to an embodiment of the present invention, FIG. 5 is a side view of a gear shaft according to an embodiment of the present invention, FIG. 6 is a perspective view of a gear shaft and a gear housing according to an embodiment of the present invention. And FIG. 7 is a side view showing a state in which a gear shaft and a power transmission gear are combined according to an embodiment of the present invention.

Referring to FIGS. 1 to 7, the coupling structure of the gear shaft 200 and the power transmission gear 100 according to an embodiment of the present invention includes a gear shaft 200; A power transmission gear (100) having a hollow portion (130) through which the gear shaft (200) is inserted; And at least one outer diameter groove 220 formed on the outer circumferential side of the gear shaft 200.

1 to 3, the power transmission gear 100 includes a first body 110 in which the first tooth 112 is formed, and a second body 110 in which the first body 110 and the second body 110 have different outer diameters And the second body 120 having the second body 120 can integrally constitute one body. In this embodiment, the outer diameter of the second body 120 is larger than the outer diameter of the first body 110, as an example.

The first body 110 and the second body 120 may be integrally formed, for example, by sintering a metal powder.

The first body 110 has an annular cylindrical shape having a predetermined length and an outer diameter, and a first tooth 112 is formed in a circumferential direction of the first body 110. The first toothed portion 112 may be formed with an appropriate number of gear teeth so as to obtain a constant longitudinal reduction ratio together with the second toothed portion 122 to be described later, and may be applied to both the spur gear and the helical gear .

The second body 120 is integrally formed with the first body 110 and has an annular cylindrical shape having an outer diameter larger than that of the first body 110.

A second tooth 122 is formed in the circumferential direction of the second body 120. A suitable number of gear teeth may be formed to obtain a constant longitudinal reduction ratio together with the second teeth 122 and the first teeth 112. Both spur gears and helical gears are applicable.

The inner hollows of the first body 110 and the second body 120 are connected to each other so that the gear shaft 200 is inserted into the first body 110 and the second body 120, The hollow portion 130 is formed.

The hollow 130 may pass through the first body 110 and the second body 120 on the same axis and may have an inner diameter corresponding to the outer diameter of the gear shaft 200.

Meanwhile, as shown in FIGS. 4 and 5, the gear shaft 200 may include at least one outer diameter groove 220 formed on the outer circumferential side. The outer circumferential groove 220 may be formed in a spiral shape having a predetermined pitch along the gear shaft body 210 of the gear shaft 200. The outer circumferential groove 220 may be formed on the outer circumferential side along the longitudinal direction of the gear shaft 200, .

The outer diameter of the gear shaft 200 may be 5 mm to 20 mm, and the width of the outer diameter groove 220 may be 0.5 mm to 3 mm. The depth of the outer diameter groove 220 is preferably 1% to 30% of the outer diameter of the gear shaft 200. For example, when the outer diameter of the gear shaft 200 is 5 mm, the depth of the outer diameter groove 220 may be 0.05 mm to 1.5 mm.

The semi-solid lubricating member may be filled and fixed to the outer diameter groove 220. The semi-solid lubricant member 220 is filled with the semi-solid lubricant member 220 so that particles generated during rotation of the power transmission gear 100 on the gear shaft 200, that is, As shown in Fig.

At the same time, the semisolid lubrication member filled in the outer diameter groove 220 slightly escapes from the outer diameter groove 220 and flows into the friction surface instead of the abrasive dust to replace the abrasive dust, so that the abrasion on the friction surface can be prevented or at least delayed for a long time .

Also, the particles remain between the inner diameter surface of the hollow portion 130 and the gear shaft 200 to generate scratches, and the range of scratches can be widened to prevent fretting corosion .

As the semi-solid lubricating member, for example, a semi-solid grease may be applied. In case of lubricating oil, it has characteristics of flowability according to viscosity, and periodic lubrication is required accordingly, so it can cause environmental pollution due to continuous use of processing oil.

However, the semisolid grease applied in the present invention can be filled and adhered to the outer diameter groove 220 without flowing down like lubricating oil. The semi-solid grease is solidified into a semi-solid form by dispersing a thickener in a lubricating oil. The mineral oil is usually used as a fluid component, but a synthetic oil having other lubricating properties can also be used.

The thickener has the greatest influence on determining the properties of the semi-solid grease as a component added to convert the fluid component to a semi-solid phase. Specifically, as the thickening agent, there are Ca, Na, Al, and Li, which are metallic, and silica gel or benton, etc., can be applied to the nonmetal.

In addition, various additives may be added in order to improve the various properties of the semi-solid grease.

Consistency is used as an indicator of the degree of solidification of the semi-solid grease, and the lead of the semi-solid grease according to the present invention may be 2.0 to 3.0. If the primary grease of the semi-solid grease is less than 2.0, the semi-solid grease readily deteriorates easily, and when the gear rotates at a high speed, the semi-solid grease tends to rise while the temperature rises.

On the other hand, if the main grease of the semi-solid grease is larger than 3.0, the channels are accumulated on the outer circumferential grooves 220 hardly and the friction is increased, thus causing premature wear.

Therefore, the lead of the semi-solid grease according to the present invention is desirably 2.0 to 3.0. Accordingly, only a very small amount of semi-solid grease gradually escapes from the outer diameter groove 220 and is diffused and applied between the inner diameter of the hollow portion 130 and the outer diameter of the gear shaft 200 to replace the abrasive dust. Therefore, durability can be maintained for a long time There are advantages.

Particularly, vibration may cause segregation of base oil and thickener. Barium composite semi-solid grease of lead 2.0 or lithium composite semi-solid grease of lead 3.0 may be suitably used for heavy vibration gear.

Of course, as the lubrication member, in addition to semi-solid grease, grease or oil may be applied.

As shown in FIGS. 6 and 7, a gear housing 300 may be provided in which one side of the gear shaft 200 is inserted, and the gear housing 300 is coupled to the power transmission gear 100. The gear housing 300 includes a gear housing body 310 having a predetermined shape and a communication groove 320 for discharging dust and lubricating member circulation is formed at a portion where the gear housing 300 and the power transmission gear 100 are coupled, .

Wear dust or foreign matter between the inner diameter surface of the power transmission gear 100 and the gear shaft 200 is generated through the structure of the outer diameter groove 220 of the gear shaft 200 and the communication groove 320 of the gear housing 300 The lubricating member can be smoothly circulated to the outside, and the lubricating member can be prevented from being separated from the lubricating member.

In addition, there is an advantage that the initial treading time can be reduced in the gear box to which the coupling structure of the power transmission gear 100 and the gear shaft 200 is applied.

According to the combination structure of the gear shaft and the power transmission gear according to the embodiments of the present invention described so far, the gear shaft can be prevented from scratching, scratching and corrosion caused between the gear and the gear shaft, It improves the reliability of the product by raising the service life of the gearbox without the use or processing of additional parts. It prevents the environmental pollution caused by unnecessary plating and machining, reduces the number of parts and production process and increases the productivity. .

In addition, it is possible to eliminate the wear-in time between a plurality of power transmission gears and gear shafts, to discharge abrasive dust generated during the initial or long-term operation of the operation to the outside, It is possible to prevent the lubricating member from deviating to the outside in a high-pressure environment, and to secure a circulating path through which the lubricating member can infiltrate again.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims. You can do it. It is therefore to be understood that the modifications encompassed by the appended claims are intended to be included within the scope of the present invention.

100: Power transmission gear 110: First body
112: first tooth portion 120: second body
122: second tooth portion 130: hollow portion
200: gear shaft 210: gear shaft body
220: outer diameter groove 300: gear housing
310: Gear housing body 320:

Claims (10)

Gear shaft;
A power transmission gear having a hollow portion through which the gear shaft is inserted;
At least one outer diameter groove formed on an outer peripheral side of the gear shaft; And
And a lubrication member that is fixedly attached to the outer diameter groove and absorbs abrasion dust generated on a friction surface between the power transmission gear and the gear shaft. The method according to claim 1,
Wherein the outer diameter groove is formed in a spiral shape having a predetermined pitch. The method according to claim 1,
And a gear housing having one side of the gear shaft inserted therein and engaged with the power transmission gear. The method of claim 3,
And a coupling groove formed in a portion where the gear housing and the power transmission gear are coupled with each other, the coupling groove for discharging the dust and circulating the lubricant member. The method according to claim 1,
And the outer diameter of the gear shaft is 5 mm to 20 mm. The method according to claim 1,
And the width of the outer diameter groove is 0.5 mm to 3 mm. The method according to claim 1,
And the depth of the outer diameter groove is 1% to 30% of the outer diameter of the gear shaft. 8. The method according to any one of claims 1 to 7,
The power transmission gear
A first body having a first toothed portion formed along the circumferential direction;
And a second body provided at one side of the first body and having a different outer diameter from the first body and having a second toothed portion formed thereon. 8. The method according to any one of claims 1 to 7,
Wherein the lubricating member is made of one of semi-solid grease, grease, and oil. 10. The method of claim 9,
Wherein the semi-solid grease has a consistency of 2.0 to 3.0.

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