KR102602102B1 - A Eccentric reducer and gear manufacturing method of the eccentric reducer - Google Patents

Abstract

An eccentric reducer according to an embodiment of the present invention includes an input unit that receives rotational force from the outside; At least one disk gear disposed outside the input unit in the radial direction, rotates eccentrically with respect to the input unit, and has a plurality of external grooves formed thereon; a ring gear having a plurality of internal teeth that mesh with the external teeth of the disk gear within a certain range; and an output unit that rotates concentrically with the input unit in conjunction with the rotation of the disk gear.
In addition, the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention constitutes an eccentric reducer including a disk gear on which external teeth are formed and a ring gear on which internal teeth are formed and which is provided to enable mutual rolling contact with the disk gear. As a gear manufacturing method of an eccentric reducer for manufacturing a gear, the gear manufacturing method of the eccentric reducer generates the basic shape of any one or more gears selected from the disk gear and the ring gear, and includes a hypocycloid curve and an epicycloid curve. A basic shape generation step of generating a basic tooth shape constituting the gear based on the combined trochoid curve; After the basic shape generating step, a modified tooth shape generating step of moving the position of the trochoid curve of the basic tooth shape by a predetermined distance and generating a modified modified tooth shape based on the moved trochoid curve; After the correction tooth forming step, a tooth processing step of machining the gear having the correction teeth. The tooth shape processing step includes: forming a gear convex portion in which a convex side slip reduction portion is formed by processing and flattening the tip of the gear teeth constituting the modified tooth shape generated in the correction tooth shape generating step; and a gear groove forming step of forming a gear groove in which a groove-side slip reduction portion is formed by flattening the bottom surface of the groove formed between the gear teeth.

Description

Eccentric reducer and gear manufacturing method of the eccentric reducer {A Eccentric reducer and gear manufacturing method of the eccentric reducer}

The present invention relates to an eccentric reducer and a method of manufacturing gear teeth of the eccentric reducer. While miniaturizing the eccentric reducer, it secures ease of production by having a small number of parts, increases the power transmission limit, and provides high durability. The purpose is to provide an eccentric reducer and a method of manufacturing gear teeth of the eccentric reducer.

In general, a reducer is a power transmission device for outputting high-speed rotational force input from a power device such as a motor as a low-speed, large rotational force. These reducers are mounted on the joints of industrial robots and serve to reduce the high-speed rotational force input from the power device to the appropriate rotational force required by the arm of the robot.

Various types of reducers have been developed depending on the reduction method. Reducers include, for example, harmonic reducers, ball reducers, planetary gear reducers, cyclo reducers, and RV (revolutionary vector) reducers.

The harmonic reducer generally includes a circular spline with internal tooth-shaped gears and a flexible spline with external gears formed to engage with the internal gears of the circular spline, and is caused by the difference in the number of teeth of the gears of the circular spline and the flexible spline. The high-speed input rotation force is slowed down to low speed using the relative rotation.

A planetary gear reducer generally includes a plurality of gears that rotate in mesh with each other, and reduces the rotational speed by using the tooth ratio of the gears on the input side and the gear on the output side.

An eccentric reducer generally includes a ring gear and a disk gear that has teeth formed to engage with the ring gear and rotates relative to the crankshaft, using the relative rotation generated by the difference in the number of teeth of the ring gear and the disk gear. This reduces the input high-speed rotational force to low speed. The RV reducer has a similar structure to the cyclo reducer.

In particular, the operating principle of the eccentric reducer is that a two-stage disk gear is disposed eccentrically at a 180-degree phase inside the ring gear, and an input shaft eccentric to the 180-degree phase of the disk gear is disposed inside.

Power is transmitted to a plurality of output pins inserted into a plurality of holes drilled in the disk gear, and the plurality of output pins are connected to the output shaft as one body to output the final reduced rotation.

At this time, power transmission occurs in the contact area of the gear teeth with the ring gear, and because the disk gear operates eccentrically due to the eccentric input shaft, the gear teeth formed on the disk gear seem to jump by the difference in number of teeth with the ring gear. A cycloid-shaped overtaking movement is displayed, and a deceleration effect occurs through this deviated overtaking movement.

At this time, when manufacturing the gear constituting the above-described reducer, the gear may be manufactured to have a cycloidal gear tooth shape, a pseudo-cycloidal gear tooth shape, an involute gear tooth shape, a wave strain type tooth shape, etc.

In particular, the cycloidal gear tooth shape maintains multiple contact areas all around, so it has the effect of dispersing stress and is advantageous in transmitting high power in a small size, so it is mainly used when miniaturization of the reducer is required. It is being used.

However, in the case of the above-mentioned cycloid gear tooth shape, a large number of roller pins are required for the inner diameter of the ring gear, which significantly increases the number of parts in the reducer. Not only does the quality control factor increase with the increase in the number of parts, but also the assembly man-hours. It also contains problems that are increasing significantly.

In addition, as there are more contact points between each gear compared to other gear teeth, when manufacturing a reducer, the dimensional precision of each part needs to meet a significantly high level, which also poses the problem of significantly increasing the manufacturing cost.

And, in the case of a pseudo-cycloidal gear tooth shape, by applying a pseudo-epic or hypo-cycloidal gear tooth shape, the contact area between the ring gear and the disk gear is formed in one place, and a slight gap is formed on the opposite side of the phase of 180 degrees to reduce friction. Losses can be minimized and the negative effects of manufacturing tolerances can also be reduced, which is advantageous for securing improved mass production. However, since the shape of the gear teeth is formed significantly gently, the contact angle is also lowered, causing a problem of increased kinematic loss. .

In addition, in the case of the involute gear tooth shape, it is produced based on the involute curve instead of the trochoid curve, and as it is currently the most popular, the production base is well established, so it is advantageous for mass production, but compared to the reduction ratio, the gear As the tooth profile became significantly smaller, there was a problem that the power transmission limit was correspondingly lowered, and a slight slip occurred kinematically at the contact point, so there was a problem of increased friction loss.

In the case of the wave strain type tooth shape, which is used when manufacturing the above-mentioned harmonic reducer, it has the advantage of being able to reduce weight by applying elastically deformable flexible splines, but due to fatigue failure and buckling. It has the problem of low durability due to shortened lifespan.

Republic of Korea Patent Publication Registration No. 10-1140794 Republic of Korea Patent Publication Registration No. 10-1901278

The present invention is intended to solve the above-mentioned problems, and more specifically, to provide an eccentric reducer with high durability while ensuring ease of production by having a small number of parts while miniaturizing the reducer and increasing the power transmission limit. And the purpose is to provide a method of manufacturing the gear teeth of the eccentric reducer.

An eccentric reducer according to an embodiment of the present invention includes an input unit that receives rotational force from the outside; At least one disk gear disposed outside the input unit in the radial direction, rotates eccentrically with respect to the input unit, and has a plurality of external grooves formed thereon; a ring gear having a plurality of internal teeth that mesh with the external teeth of the disk gear within a certain range; and an output unit that rotates concentrically with the input unit in conjunction with the rotation of the disk gear.

The disk gear and the ring gear are provided so as to be in rolling contact with each other while the teeth of the disk gear and the ring gear are formed based on a trochoid curve, and the disk gear has an external tooth formed along the outer diameter of the disk gear. and a concavo-convex portion; wherein the ring gear is formed along an inner diameter of the ring gear and has an internal tooth concave-convex portion having a corresponding shape to enable mutual rolling contact with the external concave-convex portion.

The external tooth convex portion and the internal tooth convex portion include a convex side slip reduction portion formed on a protruding side of the external tooth convex portion and a protruding side of the internal tooth convex portion, respectively, and formed to have a flat predetermined area; and a convex side curved portion formed at both ends of the convex side slip reduction portion to maintain a predetermined curvature.

The external tooth concave-convex portion and the internal tooth concave-convex portion are respectively formed on a bottom surface of the external tooth concave portion and a bottom surface of the internal tooth concave portion, and a concave side slip reduction portion formed to have a flat predetermined area; and a lumbar side curved portion formed at both ends of the lumbar side slip reduction portion to maintain a predetermined curvature.

The number of external teeth of the disk gear and the number of internal teeth of the ring gear are different from each other.

A gear manufacturing method of an eccentric reducer according to an embodiment of the present invention includes a gear constituting an eccentric reducer including a disk gear having external teeth and a ring gear having internal teeth formed and capable of mutual rolling contact with the disk gear. As a gear manufacturing method of an eccentric reducer for manufacturing, the gear manufacturing method of the eccentric reducer generates the basic shape of any one or more gears selected from the disk gear and the ring gear, and a hypocycloid curve and an epicycloid curve are combined. A basic shape generation step of generating a basic tooth shape constituting the gear based on the trochoidal curve; After the basic shape generating step, a modified tooth shape generating step of moving the position of the trochoid curve of the basic tooth shape by a predetermined distance and generating a modified modified tooth shape based on the moved trochoid curve; After the correction tooth forming step, a tooth processing step of machining the gear having the correction teeth. The tooth shape processing step includes: forming a gear convex portion in which a convex side slip reduction portion is formed by processing and flattening the tip of the gear teeth constituting the modified tooth shape generated in the correction tooth shape generating step; and a gear groove forming step of forming a gear groove in which a groove-side slip reduction portion is formed by flattening the bottom surface of the groove formed between the gear teeth.

The gear convex portion forming step includes setting a convex reference line offset toward the outside of the pitch circle, based on the pitch circle of the gear; After the step of setting the convex reference line, a convex side slip reduction portion forming step of forming the convex side slip reduction portion based on the convex reference line; And after the step of forming the convex side slip reducing portion, forming a convex side curved portion having a predetermined curvature at both ends of the convex side slip reducing portion. It is characterized in that it includes;

The gear groove forming step includes: setting a groove baseline offset toward the inside of the pitch circle, based on the pitch circle of the gear; After the lumbar reference line setting step, a lumbar side slip reduction portion forming step of forming the lumbar side slip reduction portion based on the lumbar reference line; and a lumbar side curved portion forming step of forming a lumbar side curved portion having a predetermined curvature at both ends of the lumbar side slip reduction portion after the lumbar side slip reduction portion forming step.

The gear concave portion forming step includes forming a concave side curved portion of a predetermined curvature at both ends of the concave side slip reduction portion, and the gear convex portion forming step includes forming a concave side curved portion at both ends of the convex side slip reduction portion. A convex side curved portion forming step of forming a convex side curved portion of a predetermined curvature, wherein the convex side curved portion is formed on one or more gears selected from a plurality of gears meshed with each other and driven, and the concave portion formed on the other gear. The curved portions are characterized in that they are formed to have corresponding shapes to enable rolling contact with each other.

The eccentric reducer according to an embodiment of the present invention reduces the number of parts to a minimum without arranging a large number of roller pin parts, thereby minimizing quality control and tolerance management points, and thereby lowering the production price.

In particular, together with the convex side slip reduction portion, the lumbar side slip reduction portion, the convex side curved portion, and the lumbar side curved portion formed on the disk gear described above, the convex side slip reduction portion and the lumbar side slip reduction portion formed on the ring gear, Through the convex-side curved portion and the concave-side curved portion, smooth power transmission can be achieved without providing additional roller pins in the inner diameter of the ring gear, and the number of parts can be significantly reduced, which not only improves ease of manufacture and reduces production costs. In addition, improved durability can also be secured.

In addition, through the formation of the convex side curved portion and the concave side curved portion, the gentleness of the gear tooth shape can be minimized, thereby increasing the contact angle and minimizing kinematic loss, thereby providing the effect of securing improved operating efficiency.

In addition, the difference in the number of gear teeth between the disk gear and the ring gear can be significantly reduced, which allows the gear tooth shape to be increased to increase the power transmission limit, and friction loss can be minimized because there is no kinematic slip at the contact point. It is possible to provide effective effects.

In addition, it is possible to provide the effect of ensuring significantly improved durability while eliminating the need for a highly difficult individual component manufacturing process.

Figure 1 is a perspective view showing an eccentric reducer according to an embodiment of the present invention from the input unit side.
Figure 2 is a perspective view showing the eccentric reducer according to an embodiment of the present invention from the output unit side.
Figure 3 is a side cross-sectional view showing a side cross-section of an eccentric reducer according to an embodiment of the present invention.
Figure 4 is a front view showing a state in which a disk gear and a ring gear constituting an eccentric reducer according to an embodiment of the present invention are meshed with each other.
Figure 5 is an enlarged view showing area A of Figure 4.
Figure 6 is an enlarged view showing area B of Figure 5.
Figure 7 is a block flow chart showing the progress of the gear manufacturing method of an eccentric reducer according to an embodiment of the present invention.
Figure 8 is a progress diagram showing the progress of the corrected tooth shape generation step constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention.
Figure 9 is a block flowchart showing the detailed progress sequence of the tooth processing steps constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention.
Figure 10 is a block flowchart showing the progress sequence of the gear convex forming step constituting the tooth processing step of the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention.
Figure 11 is a block flowchart showing the progress sequence of the gear recess forming step constituting the tooth processing step of the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention.
Figure 12 is a progress diagram showing a state in which the disk gear of the eccentric reducer is being processed through the tooth processing step constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention.
Figure 13 is a progress diagram showing a state in which the disk gear of the eccentric reducer is processed through the tooth processing step constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to be understood by those skilled in the art. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Additionally, the terms used in this specification are for describing embodiments and are not intended to limit the present invention.

As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” and/or “comprising” does not exclude the presence or addition of elements other than the mentioned elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains.

Hereinafter, the present invention will be described with reference to the attached drawings.

First, a rough description of the eccentric reducer according to an embodiment of the present invention will be provided with reference to FIGS. 1 and 2.

Figure 1 is a perspective view showing an eccentric reducer according to an embodiment of the present invention from the input side, and Figure 2 is a perspective view showing an eccentric reducer according to an embodiment of the present invention from the output side.

As shown in FIGS. 1 and 2, the eccentric reducer 1000 according to an embodiment of the present invention has an input unit 100 formed on one side and an output unit 400 formed on the other side, and the input unit ( 100) and the output unit 400 are provided to be surrounded by a housing of a predetermined shape.

Next, the eccentric reducer according to an embodiment of the present invention will be described in more detail with reference to FIGS. 3 to 6.

Figure 3 is a side cross-sectional view showing a side cross-section of an eccentric reducer according to an embodiment of the present invention, and Figure 4 shows a state in which the disk gear and ring gear constituting the eccentric reducer according to an embodiment of the present invention are meshed with each other. It is a front view, and Figure 5 is an enlarged view of area A of Figure 4, and Figure 6 is an enlarged view of area B of Figure 5.

As shown in FIGS. 3 and 4, the eccentric reducer 1000 according to an embodiment of the present invention includes an input unit 100, a disk gear 200, a ring gear 300, and an output unit 400. You can.

First, the input unit 100 is provided to receive rotational force from the outside, and is provided to provide the rotational force received from the outside to the disk gear.

At this time, the disk gear 200 may be seated on the input shaft 110 constituting the input unit 100 to enable eccentric rotation, and a space between the disk gear 200 and the input shaft for eccentric rotation of the disk gear may be provided. An eccentric bearing 120 may be provided.

Next, the disk gear 200 is disposed on the radial outer side of the input unit and is provided to rotate eccentrically with respect to the input shaft 100.

In addition, the disk gear 200 is formed with a plurality of external teeth and may be provided with at least one, and more preferably, at least one pair of disk gears 200 may be provided to mesh with the ring gear 300. .

At this time, the teeth of the disk gear 200 and the ring gear 300 may be formed based on a trochoid curve and may be provided to enable rolling contact with each other.

In addition, a plurality of through holes may be formed in the disk gear 200, and at least one or more means for transmitting rotational force through the through holes to the output shaft 410 constituting the output unit 400, which will be described later. It can be connected to the output pin 420.

In addition, the disk gear 200 may include an external concave-convex portion 210 formed along the outer diameter of the disk gear 200.

In particular, the external concave-convex portion 210 includes an external convex portion 211, an external concave portion 212, a convex side slip reduction portion 213, a concave side slip reduction portion 214, a convex side curved portion 215, and a concave side convex portion. It may include a curved portion 216.

Here, the external convex portion 211 is formed to protrude at a predetermined height toward the radial outer side of the disk gear 200.

And, the external recess 212 is formed to be recessed at a predetermined height toward the center of the rotation axis of the disk gear 200.

In addition, the convex side slip reduction portion 213 is formed on the protruding side of the external convex portion 211 and is formed to have a flat predetermined area.

In addition, the recess side slip reduction portion 214 may be formed to have a flat area on the inside of the external recess 212.

Next, the convex side curved portion 215 is formed to have a predetermined curvature at both ends of the convex side slip reduction portion 213.

Additionally, the waist side curved portion 216 is formed to have a predetermined curvature at both ends of the waist side slip reduction portion 214.

In addition, the convex side curved portion 215, along with the concave side curved portion 216, is formed to minimize interference between the gear teeth constituting the disc gear and the gear teeth constituting the ring gear, which are provided to enable mutual rolling contact. .

In addition, through the formation of the convex side curved portion 215 and the concave side curved portion 216, the gentleness of the gear tooth shape can be minimized, thereby increasing the contact angle and minimizing kinematic loss, thereby ensuring improved operating efficiency.

Next, the ring gear 300 may be provided with a plurality of internal teeth formed to mesh with the disk gear 200 within a certain range.

In particular, the ring gear 300 may include an internal tooth concave-convex portion 310, and the internal tooth concavo-convex portion 310 is formed along the inner diameter of the ring gear and interlocks with the external tooth concave-convex portion 210. It is provided to have a corresponding shape so that contact is possible.

More specifically, the internal tooth convex portion 310 includes an internal tooth convex portion 311, an internal tooth concave portion 312, a convex side slip reduction portion 313, a concave portion side slip reduction portion 314, and a convex side curved portion 315. , may include a lumbar side curved portion 316.

Here, the internal tooth convex portion 311 is formed to protrude at a predetermined height toward the center of the rotation axis of the output shaft 410.

Next, the internal tooth recess 312 is formed to a predetermined height toward the radial outer side of the ring gear.

Additionally, the convex side slip reduction portion 313 is formed on the protruding side of the internal tooth convex portion 311 and is formed to have a flat predetermined area.

Additionally, the recess side slip reduction portion 314 is formed inside the internal tooth recess 312, and may be formed to have a flat predetermined area.

In addition, the convex side curved portion 315 is formed to have a predetermined curvature at both ends of the convex side slip reducing portion 313, and the lumbar side curved portion 316 is formed on both sides of the lumbar side slip reducing portion 314. It is formed to have a predetermined curvature at the side end.

More specifically, the convex side curved portion 315, together with the concave side curved portion 316, constitutes the ring gear 300 and the gear teeth constituting the above-described disk gear 200, which are provided to enable mutual rolling contact. It is formed to minimize interference between gears.

In addition, through the formation of the convex side curved portion 315 and the concave side curved portion 316, the gentleness of the gear tooth shape can be minimized, thereby increasing the contact angle and minimizing kinematic loss, thereby ensuring improved operating efficiency.

In particular, the convex side slip reduction portion 213, the lumbar side slip reduction portion 214, the convex side curved portion 215, and the lumbar side curved portion 216 formed on the disk gear 200 described above and the ring gear 300. ), an additional roller pin is added to the inner diameter of the ring gear 300 through the convex side slip reduction portion 313, the lumbar side slip reduction portion 314, the convex side curved portion 315, and the lumbar side curved portion 316. Smooth power transmission can be achieved without providing a , allowing the number of parts to be significantly reduced.

In addition, the number of external teeth of the disk gear 200 and the number of internal teeth of the ring gear 300 may be different from each other, and the number of gear teeth of the disk gear 200 and the number of gear teeth of the ring gear 300 may be different from each other. It can be arranged so that there is at least one difference.

In addition, the output unit 400 is provided to rotate concentrically with the input unit 100 in conjunction with the rotation of the disk gear 200.

At this time, the torque input through the input unit 300 increases through the disk gear 200 and the ring gear 300, and the increased torque is output through the output unit 400.

In particular, the output unit 400 may include an output shaft 410 and an output pin 420.

Here, the output shaft 410 is coupled to the output pin 420 and is provided to receive and output the rotational force applied to the output pin 420.

In addition, a plurality of output pins 420 may be provided and rotatably seated in a through hole formed in the disk gear 200.

That is, based on the above-described structure, the disk gear 200, eccentrically seated on the input shaft 110, rotates eccentrically in a meshed state with the ring gear 300, and generates a rotational force toward the output pin 420. is transmitted, and the output shaft 410 is rotated by the output pin 420 that receives the rotational force.

Next, with reference to FIGS. 7 and 8, a method of manufacturing gears for an eccentric reducer according to an embodiment of the present invention will be described in more detail.

Figure 7 is a block flowchart showing the progress of the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention, and Figure 8 is a modified tooth shape creation constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention. It is a progress diagram showing the progress of each step.

First, the gear manufacturing method of the eccentric reducer allows manufacturing a gear constituting an eccentric reducer including a disk gear on which external teeth are formed and a ring gear on which internal teeth are formed and which is provided to enable mutual rolling contact with the disk gear. It goes on.

More specifically, the method of manufacturing the gear of the eccentric reducer may include a basic shape creation step (S100), a modified tooth creation step (S200), and a tooth processing step (S300).

First, the basic shape creation step (S100) is performed to generate the basic shape of one or more gears (G) selected from among the disk gear and the ring gear.

More specifically, the basic shape generating step (S100) is performed to generate a basic tooth shape constituting the gear G based on a trochoidal curve that is a combination of a hypocycloidal curve and an epicycloidal curve.

Next, the correction tooth shape generation step (S200) is a step that proceeds after the basic shape creation step (S100).

More specifically, the correction tooth shape generation step (S200) is performed to move the position of the trochoid curve of the basic tooth shape by a predetermined distance and generate a modified correction tooth shape based on the moved trochoid curve.

More specifically, when the corrected tooth shape generation step (S200) is performed, the separation distance between the first trochoid curve (TL1) representing the basic tooth shape and the second trochoid curve (TL2) that is moved by a predetermined distance is meshed with each other. The gears (G), that is, the disk gear and the ring gear, are ensured to have a tolerance sufficient to allow rolling contact with each other.

Next, the tooth processing step (S300) is a step that proceeds after the correction tooth forming step and is performed to process a gear holding the correction tooth shape. The tooth processing step is described in more detail with reference to FIGS. 9 to 13 below. Let me explain.

Next, with reference to FIGS. 9 to 13, the tooth processing step of the gear manufacturing method for an eccentric reducer according to an embodiment of the present invention will be described in more detail.

Figure 9 is a block flowchart showing the detailed progress sequence of the tooth machining steps constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention, and Figure 10 is a block flow chart showing the gear manufacturing of the eccentric reducer according to an embodiment of the present invention. It is a block flowchart showing the progress sequence of the gear convex forming step constituting the tooth processing step of the method, and Figure 11 is a gear concave forming step constituting the tooth processing step of the gear manufacturing method for an eccentric reducer according to an embodiment of the present invention. It is a block flowchart showing the progress sequence, and FIG. 12 is a progress state diagram showing a state in which the disk gear of the eccentric reducer is being processed through the tooth processing step constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention. 13 is a progress diagram showing the state in which the disk gear of the eccentric reducer is processed through the tooth processing step constituting the gear manufacturing method of the eccentric reducer according to an embodiment of the present invention.

As shown in FIGS. 9 to 13, the tooth shape processing step (S300) may include a gear convex portion forming step (S310) and a gear concave portion forming step (S320).

First, the gear convex forming step (S310) is performed to form a gear convex portion in which a convex side slip reduction portion is formed by processing and flattening the tip of the gear tooth constituting the corrected tooth shape generated in the above-described correction tooth forming step.

The gear convex portion forming step (S310) may include a convex reference line setting step (S311), a slip reduction portion forming step (S312), and a convex side curved portion forming step (S313).

First, the convex reference line setting step (S311) includes setting a convex reference line (RL1) offset toward the outside of the pitch circle, based on the pitch circle (PC) of the gear (S311);

In addition, the step of forming the iron portion side slip reduction portion (S312) is a step that proceeds after the iron portion baseline setting step (S311), and improves driving efficiency by minimizing slip between the disc gear and the ring gear that mesh with each other. can be secured.

In particular, the step of forming the convex side slip reducing portion (S312) may be performed so that the convex side slip reducing portion is formed based on the convex reference line RL1.

Next, the step of forming the convex side curved portion (S313) is a step that proceeds after the step of forming the convex side slip reducing portion (S312), and more specifically, the convex side having a predetermined curvature at both ends of the convex side slip reducing portion. It proceeds to form a curved section.

And, the gear groove forming step (S320) is a step of forming a gear groove in which a groove-side slip reduction portion is formed by flattening the bottom surface of the groove formed between the gear teeth.

In particular, the gear groove forming step (S320) may include a groove baseline setting step (S321), a slip reduction portion forming step (S322), and a waist side curved portion forming step (S323).

First, the lumbar reference line setting step (S321) is performed to set, based on the pitch circle (PC) of the gear, a lumbar reference line (RL2) offset toward the inside of the pitch circle.

In particular, through the lumbar reference line setting step (S321), after setting the lumbar reference line, the lumbar side slip reduction portion and the lumbar side curved portion can be formed, thereby reducing excess between the disc gear and the ring gear. By preventing the generation of frictional force, it is possible to minimize frictional loss that may occur when the above-described gears rotate while engaged.

Then, the lumbar side slip reduction portion forming step (S322) is performed after the lumbar reference line setting step (S321) so that the lumbar side slip reduction portion is formed based on the lumbar reference line.

In particular, through the lumbar side slip reduction portion forming step (S322), the lumbar side slip reduction portion formed to correspond to the convex side slip reduction portion described above can be formed, thereby minimizing the slip between the disc gear and the ring gear meshing with each other. Improved driving efficiency can be secured.

And, the waist side curved portion forming step (S323) is a step that proceeds after the waist side slip reduction portion forming step (S322).

Meanwhile, the convex side curved portion formed on one or more gears selected from among a plurality of gears driven by meshing with each other and the concave side curved portion formed on the other gear are formed to have corresponding shapes to enable mutual rolling contact.

In particular, the lumbar side curved portion forming step (S323) is performed to form a lumbar side curved portion having a predetermined curvature at both ends of the lumbar side slip reduction portion.

In particular, through the progress of the concave side curved portion forming step (S323), the contact angle with the convex side curved portion created through the convex side curved portion forming step described above can be improved, thereby ensuring improved driving efficiency. .

That is, according to one embodiment of the present invention, together with the convex side slip reduction portion, the concave side slip reduction portion, the convex side curved portion, and the concave side curved portion formed on the disk gear described above, the convex side slip formed on the ring gear. Through the reduction part, the lumbar side slip reduction part, the convex side curved part, and the lumbar side curved part, smooth power transmission can be achieved without providing an additional roller pin in the inner diameter of the ring gear, and the number of parts can be significantly reduced. In addition to improved ease of manufacturing and reduced production costs, improved durability can also be secured.

In addition, through the formation of the convex side curved portion and the concave side curved portion, the gentleness of the gear tooth shape can be minimized, thereby increasing the contact angle and minimizing kinematic loss, thereby ensuring improved operating efficiency.

In addition, the difference in the number of gear teeth between the disk gear and the ring gear can be significantly reduced, which allows the gear tooth shape to be increased to increase the power transmission limit, and friction loss can be minimized because there is no kinematic slip at the contact point. It can provide effective effects.

And, of course, it is possible to secure significantly improved durability while eliminating the need for a highly difficult individual component manufacturing process.

As described above, the present invention has been described with reference to the drawings, but this is only for illustrating the invention, and those skilled in the art will be able to make various modifications or equivalent embodiments from the detailed description of the invention. You will be able to understand it.

Therefore, the true scope of rights of the present invention must be determined by the technical spirit of the patent claims.

100: input unit
200: disk gear
210: External uneven part
211: Otzi Cheolbu
212: Otzi seductress
213: Steel side slip reduction part
214: Lumbar side slip reduction unit
215: iron side curved part
216: Lumbar side curved part
300: ring gear
310: Internal tooth uneven portion
311: natch waist
312: Internal teeth iron part
313: Steel side slip reduction part
314: Lumbar side slip reduction part
315: iron side curved part
316: Lumbar side curved part
400: output unit
410: output shaft
420: output pin
G: gear
TL1: first trochoid curve
TL2: Second trochoid curve
PC: Peach One
RL1: Iron reference line
RL2: Lumbar baseline
S100: Basic shape creation step
S200: Modified impression creation step
S300: Tooth processing step
S310: Gear iron part forming step
S321: Iron base line setting step
S322: External slip reduction zone formation step
S323: External curve formation step
S320: Gear recess forming step
S321: Lumbar baseline setting step
S322: Slip reduction portion formation step on the inner tooth side
S333: Internal tooth side curve formation step

Claims (10)

delete delete delete delete delete A gear manufacturing method for an eccentric reducer for manufacturing a gear constituting an eccentric reducer including a disk gear on which external teeth are formed and a ring gear on which internal teeth are formed and which is provided to enable mutual rolling contact with the disk gear, comprising:
The gear manufacturing method of the eccentric reducer is,
A basic shape generation step ( S100);
After the basic shape generating step, a corrected tooth shape generating step (S200) of moving the position of the trochoid curve of the basic tooth shape by a predetermined distance and generating a modified corrected tooth shape based on the moved trochoid curve;
After the correction tooth forming step, a tooth processing step (S300) of machining the gear having the correction tooth shape. According to claim 6,
The tooth shape processing step (S300),
A gear convex forming step (S310) of forming a gear convex portion in which a convex side slip reduction portion is formed by processing and flattening the tip of the gear tooth constituting the corrected tooth shape generated in the correction tooth shape generation step (S310); and
A gear manufacturing method for an eccentric reducer, characterized in that it proceeds to include a gear groove forming step (S320) of forming a gear groove in which a groove-side slip reduction portion is formed by flattening the bottom surface of the groove formed between the gear teeth. According to claim 7,
The gear iron portion forming step (S310),
Based on the pitch circle of the gear, a convex reference line setting step (S311) of setting a convex reference line offset toward the outside of the pitch circle;
After the step of setting the convex reference line, a convex side slip reducing portion forming step (S312) that proceeds to form the convex side slip reducing portion based on the convex reference line; and
After the step of forming the convex side slip reducing portion, a convex side curved portion forming step (S313) of forming convex side curved portions having a predetermined curvature at both ends of the convex side slip reducing portion. Gear manufacturing of an eccentric reducer comprising a. method. According to claim 7,
The gear recess forming step (S320),
Based on the pitch circle of the gear, a lumbar reference line setting step (S321) of setting a lumbar reference line offset toward the inside of the pitch circle;
After the lumbar reference line setting step, a lumbar side slip reduction portion forming step (S322) in which the lumbar side slip reduction portion is formed based on the lumbar reference line; and
An eccentric reducer comprising: after the lumbar side slip reducing portion forming step (S322), a lumbar side curved portion forming step (S323) of forming lumbar side curved portions having a predetermined curvature at both ends of the lumbar side slip reducing portion. Gear manufacturing method. According to claim 7,
The gear recess forming step is,
A lumbar side curved portion forming step of forming a lumbar side curved portion with a predetermined curvature at both ends of the lumbar side slip reduction portion,
The gear iron portion forming step is,
Comprising a step of forming a convex side curved portion of a predetermined curvature at both ends of the convex side slip reduction portion,
A convex side curved portion formed on one or more gears selected from among a plurality of gears meshed with each other and driven, and the concave side curved portion formed on the other gear are formed to have corresponding shapes to enable mutual rolling contact. Gear manufacturing method for eccentric reducer.