WO2022124432A1

WO2022124432A1 - Speed reducer

Info

Publication number: WO2022124432A1
Application number: PCT/KR2020/017809
Authority: WO
Inventors: 유순기
Original assignee: 주식회사 재성테크
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2022-06-16
Also published as: KR102580470B1; KR20220083633A

Abstract

The present invention relates to a speed reducer using a planet gear, and a speed reducer in which a carrier including a carrier base, a first cover, and a second cover is provided with a differential gear. The speed reducer according to an embodiment of the present invention may comprise: a carrier accommodating a planet gear; an input shaft that is provided on one side of the carrier, receives power from a motor, and has gear teeth formed on the outer side thereof; a planet gear part that receives the power from the input shaft; a differential gear part that receives the power from the planet gear part; and an output part that passes through the carrier, has gear teeth formed on the other side thereof, and includes a first output shaft and a second output shaft that receive the power from the differential gear part. The carrier may include: a carrier base having a certain space formed therein; a first cover which is coupled to one side of the carrier base and through which the input shaft and the first output shaft pass; and a second cover which is coupled to the other side of the carrier base and through which the second output shaft passes.

Description

reducer

The present invention relates to a speed reducer, and more particularly, to a speed reducer in which a speed reducer using a planetary gear and a differential gear are provided on a carrier including a carrier base, a first cover and a second cover to enable compactness.

A conventional speed reducer includes a bevel gear provided on an input shaft and an output shaft, a differential gear provided to transmit power between the bevel gear, and a worm gear meshed with the differential gear.

Recently, in order to obtain a compact and large reduction ratio by improving the mechanical structure, as disclosed in US Patent US2019/0211908 A1 (hereinafter referred to as a cited document), it is configured in a form including a differential gear and a reducer in a carrier. .

However, in the cited literature, when a reducer and a differential gear are configured as a planetary gear set, the reduction gear is composed of a stepped gear composed of multiple stages. In the case of step gears, when manufacturing gears at one time, the radius at which the hob can move must be formed between the multi-stage gears. In the case of a planetary gear set including internal or external fixed gears, there is a problem in that it is difficult to install multi-stage gears.

In addition, when one side of the multi-stage gear and the differential gear are disposed in the same section, the space for gear arrangement occurs on both sides of the differential gear and the reduction gear, thereby limiting gear formation. In addition, the carrier base of this type is made of a casting material, but in the case of casting, processing is essential because the same center of gravity is not always maintained. There is a problem of causing vibration and noise throughout the device.

The problem to be solved by the present invention is that, in order to solve the problem of the conventional reducer as described above, a separate gear alignment is not required in the installation of the reduction gear, and the processing of the carrier base is easy to solve the problem of the center of gravity, and the carrier It is to provide a reducer that minimizes interference during operation by arrangement of a reduction gear and a differential gear in the interior.

In the reducer according to an embodiment of the present invention, the carrier for accommodating the planet gear (Planet gear); an input shaft provided on one side of the carrier, receiving power from the motor and having a gear tooth formed on the outside; a planetary gear unit receiving power from the input shaft; a differential gear unit receiving power from the planetary gear unit; and an output unit provided through the carrier, a gear tooth formed on the outside, and an output unit including a first output shaft and a second output shaft receiving power from the differential gear unit, wherein the carrier includes: a carrier base having a predetermined space therein; a first cover coupled to one side of the carrier base, the input shaft and the first output shaft passing through; and a second cover coupled to the other side of the carrier base and provided through the second output shaft.

In this case, the planetary gear unit may include: a first gear provided inside the carrier base and receiving power from the input shaft; a second gear provided to protrude outside the carrier base through the first cover and the second cover and meshed with the first gear; and a fixed gear provided outside the second cover to mesh with the second gear and fixed to the reduction gear housing to not rotate, wherein the second gear includes a gear tooth formed on the fixed gear tooth), and at the same time, the carrier can be rotated about the transverse axis by the second gear.

and the differential gear unit: a first differential gear provided inside the carrier base and including a third gear and a fourth gear rotating about a transverse axis together with the carrier; and a second differential gear provided inside the carrier base, the second differential gear including a fifth gear meshed with the third gear and a sixth gear meshed with the fourth gear; and the fifth gear may transmit power to the first output shaft, and the sixth gear may transmit power to the second output shaft.

In addition, one side of the first gear has an end protruding so as to be provided on the first cover, and a first bearing is provided between the end and the first cover so that the first gear can rotate. coupled to a cover, and the second gear passes through the first gear and is rotatably coupled to the first cover and the second cover, an outer side of the first gear meshes with an outer side of the input shaft, and the first gear The inner side of the may be meshed with the outer side of the second gear.

In addition, the carrier: is provided inside the carrier base, further comprising a pin (Pin) connecting the first cover and the second cover, the third gear and the fourth gear are provided on the pin, The third gear and the fourth gear rotate about a transverse axis together with the carrier, and may also rotate about the pin.

And the inside of the fifth gear meshes with the outside of the first output shaft, the outside of the fifth gear meshes with the outside of the third gear, the inside of the sixth gear meshes with the outside of the second output shaft, and the sixth gear meshes with the outside of the second output shaft. The outer side of the gear meshes with the outer side of the fourth gear, and a second bearing is provided between the fifth gear and the sixth gear, so that the fifth gear and the sixth gear may be spaced apart by a predetermined distance.

At this time, the third gear and the fourth gear are formed by extending a gear tooth to the second bearing provided between the fifth gear and the sixth gear, so that the third gear and the fourth gear are mutually connected. can be combined.

In addition, the carrier base may include: a first hole formed therethrough to receive the second gear; a guide end with protruding ends so that the first cover and the second cover are provided on both sides; a first end having a predetermined space on one side to accommodate the first gear; and a second end having a predetermined space formed on the other side to accommodate the third gear and the fourth gear, and having a second hole formed therein so that the pin is provided.

In addition, the number of teeth of the first gear may be 2 to 5 multiples of that of the second gear, and the position of the gear trough of the second gear with respect to the gear trough of the first gear may be configured to be the same.

In addition, the number of teeth of the first gear, the second gear, and the fixed gear may be configured as a multiple of the number of the first gear and the second gear provided at equal intervals on the circumference of the carrier.

According to an embodiment of the present invention, it is possible to compact by providing a planetary gear unit and a differential gear unit in a single carrier, and a reduction ratio can be selected by configuring the fixed gear as an internal gear or an external gear.

In addition, by caulking both ends of the pin to the carrier, it can be provided in the carrier without a separate fastening device such as bolts, and the pin is rotationally constrained by the caulking and can be prevented from being detached from the carrier.

In addition, by extending the second gear to protrude to the outside of the first cover and the second cover, it is possible to omit the planetary gear support structure applied to the conventional speed reducer.

And the effects obtainable from the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. There will be.

1 is a perspective view of a speed reducer according to an embodiment of the present invention.

2 is an exploded perspective view of a speed reducer according to an embodiment of the present invention.

3 is a side view of a carrier according to an embodiment of the present invention;

4 and 5 are perspective views of a carrier base according to an embodiment of the present invention.

6 is a cross-sectional view of a speed reducer according to an embodiment of the present invention.

7 is a front view of a pin according to an embodiment of the present invention.

8 is a front view of a first cover and a second cover according to an embodiment of the present invention.

9 is a perspective view of a second gear according to an embodiment of the present invention.

10 is a view showing an external gear according to an embodiment of the present invention.

11 is a view showing an internal gear according to another embodiment of the present invention.

12 is a side view of a speed reducer according to an embodiment of the present invention.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. However, it is not intended to limit the technology described in this document to specific embodiments, and it should be understood to include various modifications, equivalents, and/or alternatives of the embodiments of this document. . In connection with the description of the drawings, like reference numerals may be used for like components.

In this document, expressions such as "have," "may have," "includes," or "may include" refer to the presence of a corresponding characteristic (eg, a numerical value, function, operation, or component such as a part). and does not exclude the presence of additional features.

In this document, expressions such as "A or B," "at least one of A or/and B," or "one or more of A or/and B" may include all possible combinations of the items listed together. . For example, "A or B," "at least one of A and B," or "at least one of A or B" means (1) includes at least one A, (2) includes at least one B; Or (3) it may refer to all cases including both at least one A and at least one B.

As used herein, expressions such as "first," "second," "first," or "second," may modify various elements, regardless of order and/or importance, and refer to one element. It is used only to distinguish it from other components, and does not limit the components. For example, the first user equipment and the second user equipment may represent different user equipment regardless of order or importance. For example, without departing from the scope of the rights described in this document, a first component may be named as a second component, and similarly, the second component may also be renamed as a first component.

One component (eg, a first component) is "coupled with/to (operatively or communicatively)" or "connected" to another component (eg, a second component) When referring to "connected to", it will be understood that the certain element may be directly connected to the other element or may be connected through another element (eg, a third element). On the other hand, when it is said that a component (eg, a first component) is "directly connected" or "directly connected" to another component (eg, a second component), the component and the It may be understood that other components (eg, a third component) do not exist between other components.

A reducer according to an embodiment of the present invention that is installed on the inner rotor of a motor (not shown), which is the main body of driving force production in an electric vehicle, and performs deceleration and differential by directly receiving driving force generated from the motor, etc. As shown in 2, the carrier 100 for accommodating the planet gear (Planet gear); an input shaft 200 provided on one side of the carrier 100, receiving power from a motor, and having a gear tooth formed on the outside thereof; a planetary gear unit 300 receiving power from the input shaft 200; a differential gear unit 400 receiving power from the planetary gear unit 300; and a first output shaft 510 and a second output shaft 520 provided through the carrier 100 , a gear tooth is formed on the outside, and receiving power from the differential gear part 400 . It may be configured to include an output unit 500 that includes.

The output unit 500 will be provided through a hollow formed in the input shaft 200, and the first output shaft 510 and the second output shaft 520 are positioned on the same straight line and rotated about a horizontal axis. can do.

In addition, since the output unit 500 is provided to be spaced apart from the input shaft 200 by a predetermined distance inside the input shaft 200, they can be rotated without interference about the horizontal axis, respectively, and the output unit 500 is a vehicle Power will be transmitted to a driving wheel (not shown) provided on one side of the .

The carrier 100 includes: a carrier base 110 having a predetermined space therein, as shown in FIG. 3 ; a first cover 120 coupled to one side of the carrier base 110 and having the input shaft 200 and the first output shaft 510 penetrated about a horizontal axis; and a second cover 130 coupled to the other side of the carrier base 110 and provided with the second output shaft 520 penetrating about the horizontal axis.

The carrier 100 is provided on the inside of the carrier base 110, as shown in FIG. 4, further comprising a pin 140 connecting the first cover 120 and the second cover 130, , a third gear 411 and a fourth gear 412 of the differential gear unit 400 to be described later may be provided on the pin 140 .

The carrier base 110 includes: as shown in FIG. 5 , a first hole 111 which is formed to be penetrated to receive the second gear 320 ; a guide end portion 112 formed so that the first cover 120 and the second cover 130 are provided on both sides of the guide end portion; a first end 113 having a predetermined space on one side to accommodate the first gear 120; and a second end 114 having a predetermined space formed on the other side to accommodate the third gear 411 and the fourth gear 412 and having a second hole 115 to be provided with the pin 140 . may be included.

As shown in FIG. 6 , the third gear 411 and the fourth gear 412 are coupled to the outside of the pin 140 , and the third gear 411 and the fourth gear 412 are the output The unit 500 may rotate in the carrier 100 , and may rotate around the first gear.

At this time, as shown in FIG. 7 , both ends of the pin 140 may have one side protruding from the shape of a circle, and may be formed to protrude in the same shape at the opposite position of the one side. In addition, as shown in FIG. 8 , the first cover 120 and the second cover 130 are caulked in a shape corresponding to the end of the pin 140 for caulking with the pin 140 . A hole C may be formed.

Both ends of the pin 140 may be caulked to the first cover 120 and the second cover 130 as shown in FIG. 6 to be provided inside the carrier 100 without a separate fastening device.

By the caulking, the pin 140 is rotationally constrained to the first cover 120 and the second cover 130 and can be prevented from being detached.

The planetary gear unit 300 includes: a first gear 310 provided inside the carrier base 110 and receiving power from the input shaft 200 ; a second gear 320 protruding outside the carrier base 110 through the first cover 120 and the second cover 130 , and meshing with the first gear 310 ; and a fixed gear 330 provided on the outside of the second cover 130, meshed with the second gear 320, and fixed to the reducer housing (not shown) by welding, a volve, a pin, etc. and not rotating. can be configured.

The second gear 320 may protrude outside the first cover 120 and may be rotatably supported by a washer or a bearing.

In this case, a bearing or the like may be provided between the fixed gear 330 and the second cover 130 to support the fixed gear 330 . And, as shown in FIG. 9 , the second gear 320 is a round-bar-shaped shaft having a step, and a gear tooth may be formed on the outside.

As shown in FIGS. 10 and 11 , the fixed gear 330 may be configured as an external gear or an internal gear selectively according to a required reduction ratio. The second gear 320 rotates along a gear tooth formed in the fixed gear 330 , and at the same time, the carrier 100 rotates about a transverse axis by the second gear 320 . can

As shown in FIG. 2 , one side of the first gear 310 of the planetary gear unit 300 has an end protruding to be provided on the first cover 120 , and the end and the first cover ( A first bearing (not shown) is provided between 120) so that the first gear 310 is coupled to the first cover 120 to enable rotation, and the second gear 320 is the first gear ( 310) and is rotatably coupled to the first cover 120 and the second cover 130, the outside of the first gear 310 is meshed with the outside of the input shaft 200, and the first gear The inner side of the 310 may be meshed with the outer side of the second gear 320 .

In order for the first gear 310 to be coupled with the second gear 320 to transmit power, a gear tooth may be formed on the inner surface of the first gear 310 , which is provided by those skilled in the art. can be easily changed by In addition, a snap ring or a power lock may be provided on the outside of the second gear 320 to fix the first gear 310 to the outside of the second gear 320 .

The planetary gear unit 300 is a reduction gear set, and the number of gear teeth of the second gear 320 and the first gear 310 may be formed in a relationship of 2 to 5 times the number of teeth of the second gear 320 based on the second gear 320 . have.

The number of teeth of the first gear 310 may be 2 to 5 times the number of teeth of the first gear 320 , and the position of the gear trough of the second gear with respect to the gear trough of the first gear may be configured to be the same.

In addition, the number of teeth of the first gear 310 , the second gear 320 , and the fixed gear 330 is the number of teeth of the first gear 310 and the second gear 320 installed at equal intervals around the circumference of the carrier 100 . It may consist of multiples of a number.

For example, if the second gear 320 and the first gear 310 are formed with an arbitrary number of teeth not in the multiple relationship, the first gear 310 and the second gear 320 are coupled. In this state, since the gear mount positions of the three first gears 310 and the gear mount positions of the second gear 320 are different from each other, the first gear 310 and the input shaft 200 are coupled to the fixed gear. In order to find each gear mount that can be combined with the 330, the inconvenience and unnecessary cost of finding the positions of the first gear 310 and the second gear 320 every time assembling occurs.

Thus, the reduction gear according to an embodiment of the present invention forms the number of teeth of the first gear 310 by a multiple of the number of teeth of the second gear 320 , regardless of the gear mountain of the second gear 320 . It is provided at the same position as the gear mount of the first gear 310, so that it can be easily assembled by matching the gear mounts of the first gear 310 and the second gear 320, respectively, without a dedicated assembling jig.

In addition, when the number of teeth of the input shaft 200 , the first gear 310 , the second gear 320 and the fixed gear 330 is configured as a multiple of the planetary gear, gear mounts are located at the same magnification, so that a separate dedicated assembly jig It can be easily assembled without

The differential gear unit 400 includes: a third gear 411 and a fourth gear 412 provided inside the carrier base 110 and rotating about a transverse axis together with the carrier 100 . primary synchronous gear 410; and a second gear provided inside the carrier base 110 and including a fifth gear 421 meshed with the third gear 411 and a sixth gear 422 meshed with the fourth gear 412 . Differential gear 420; may be configured to include.

The fifth gear 421 may transmit power to the first output shaft 510 , and the sixth gear 422 may transmit power to the second output shaft 520 .

And as shown in FIG. 12 , the inside of the fifth gear 421 of the differential gear unit 400 meshes with the outside of the first output shaft 510 , and the outside of the fifth gear 421 is the first The third gear 411 meshes with the outside, the inside of the sixth gear 422 meshes with the outside of the second output shaft 520 , and the outside of the sixth gear 422 meshes with the outside of the fourth gear 412 . can be combined.

At this time, a bearing 600 is provided between the fifth gear 421 and the sixth gear 422 so that the fifth gear 421 and the sixth gear 422 are spaced apart by a predetermined distance, and the The third gear 411 and the fourth gear 412 are formed by extending a gear tooth to the bearing 600 provided between the fifth gear 421 and the sixth gear 422 , so that the The third gear 411 and the fourth gear 412 may mesh with each other. In this case, the forward and reverse rotation of the sixth gear 422 may be circulated and transmitted up to the fifth gear 421 .

The reduction gear according to an embodiment of the present invention can be compact because the differential gear unit 400 is provided in the planetary gear unit 300, and can be operated without interference between the differential gear unit 400 and the planetary gear unit 300. .

And the carrier base of the conventional reducer, which is commonly manufactured by using a cast material, is configured in a form that can be processed through milling or lathe in an embodiment of the present invention, so that when the reducer is operated, which may occur due to the cast material Vibration and noise can be prevented.

Terms used in this document are only used to describe specific embodiments, and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meanings as commonly understood by one of ordinary skill in the art described in this document. Among terms used in this document, terms defined in a general dictionary may be interpreted with the same or similar meaning as the meaning in the context of the related art, and unless explicitly defined in this document, ideal or excessively formal meanings is not interpreted as In some cases, even terms defined in this document cannot be construed to exclude embodiments of this document.

Various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims of the present invention, and these modifications are the technical spirit or spirit of the present invention. It should not be understood individually from the perspective.

Claims

a carrier for accommodating a planet gear;

an input shaft provided on one side of the carrier, receiving power from the motor and having a gear tooth formed on the outside;

a planetary gear unit receiving power from the input shaft;

a differential gear unit receiving power from the planetary gear unit; and

It is provided through the carrier, a gear tooth is formed on the outside, and an output unit including a first output shaft and a second output shaft receiving power from the differential gear unit,

The carrier is:

a carrier base having a predetermined space therein;

a first cover coupled to one side of the carrier base, the input shaft and the first output shaft passing through; and

Reducer including; a second cover coupled to the other side of the carrier base and provided through the second output shaft
The method according to claim 1,

The planetary gear unit:

a first gear provided inside the carrier base and receiving power from the input shaft;

a second gear provided to protrude outside the carrier base through the first cover and the second cover and meshed with the first gear; and

a fixed gear provided outside the second cover, meshed with the second gear, fixed to the reduction gear housing and not rotating;

The second gear rotates along a gear tooth formed on the fixed gear, and at the same time, the carrier rotates about a transverse axis by the second gear.
a carrier for accommodating a planet gear;

an input shaft provided on one side of the carrier, receiving power from the motor and having a gear tooth formed on the outside;

a planetary gear unit receiving power from the input shaft;

a differential gear unit receiving power from the planetary gear unit; and

It is provided through the carrier, a gear tooth is formed on the outside, and an output unit including a first output shaft and a second output shaft receiving power from the differential gear unit,

The carrier is:

a carrier base having a predetermined space therein;

a first cover coupled to one side of the carrier base, the input shaft and the first output shaft passing through; and

and a second cover coupled to the other side of the carrier base and provided through the second output shaft;

The planetary gear unit:

a first gear provided inside the carrier base and receiving power from the input shaft;

a second gear protruding outside the carrier base through the first cover and the second cover and meshing with the first gear; and

It is provided on the outside of the second cover, is meshed with the second gear, is fixed to the reduction gear housing and does not rotate, and a fixed gear composed of an internal gear or an external gear;

The second gear rotates along a gear tooth formed on the fixed gear, and at the same time, the carrier rotates about a transverse axis by the second gear.
4. The method of claim 2 or 3,

The differential gear unit:

a first differential gear provided inside the carrier base, the first differential gear including a third gear and a fourth gear rotating about a transverse axis together with the carrier; and

a second differential gear provided inside the carrier base and including a fifth gear meshed with the third gear and a sixth gear meshed with the fourth gear;

The fifth gear transmits power to the first output shaft, and the sixth gear transmits power to the second output shaft.
5. The method of claim 4,

One side of the first gear is formed with an end protruding so as to be provided on the first cover, and a first bearing is provided between the end and the first cover so that the first gear is rotatable on the first cover. combined,

The second gear passes through the first gear and is rotatably coupled to the first cover and the second cover,

An outer side of the first gear meshes with an outside of the input shaft, and an inside side of the first gear meshes with an outside side of the second gear.
6. The method of claim 5,

The carrier is:

It is provided inside the carrier base, further comprising a pin (Pin) connecting the first cover and the second cover,

The third gear and the fourth gear are provided on the pin, so that the third gear and the fourth gear rotate in the carrier around the output unit, and the first gear rotates around the first gear Reducer characterized in that
7. The method of claim 6,

The inside of the fifth gear meshes with the outside of the first output shaft, the outside of the fifth gear meshes with the outside of the third gear,

The inside of the sixth gear meshes with the outside of the second output shaft, and the outside of the sixth gear meshes with the outside of the fourth gear,

A second bearing is provided between the fifth gear and the sixth gear, and the fifth gear and the sixth gear are spaced apart by a predetermined distance.
8. The method of claim 7,

The third gear and the fourth gear are formed by extending a gear tooth to the second bearing provided between the fifth gear and the sixth gear, whereby the third gear and the fourth gear are meshed with each other. Reducer characterized in that
9. The method of claim 8,

The carrier base comprises:

a first hole formed therethrough to receive the second gear;

a guide end formed with protruding ends so that the first cover and the second cover are provided on both sides;

a first end having a predetermined space on one side to accommodate the first gear; and

A reduction gear comprising a second end having a predetermined space formed on the other side to accommodate the third gear and the fourth gear, and a second hole formed therein to be provided with the pin.
10. The method of claim 9,

The number of teeth of the first gear is 2 to 5 multiples of that of the second gear, and the position of the gear trough of the second gear with respect to the gear trough of the first gear is the same.
11. The method of claim 10,

The number of teeth of the first gear, the second gear, and the fixed gear is a reduction gear, characterized in that it is composed of a multiple of the number of the first gear and the second gear provided at equal intervals on the circumference of the carrier