KR102580470B1 - reducer - Google Patents

Abstract

The present invention relates to a reducer using a planetary gear and a reducer equipped with a differential gear on a carrier including a carrier base, a first cover, and a second cover.
In the reducer according to an embodiment of the present invention, a carrier accommodating a planet gear; an input shaft provided on one side of the carrier, receiving power from a motor and having gear teeth formed on the outside; A planetary gear unit that receives power from the input shaft; A differential gear unit that receives power from the planetary gear unit; and an output unit that is provided to penetrate the carrier, has gear teeth formed on the outside, and includes a first output shaft and a second output shaft that receive power from the differential gear unit, and the carrier has: an internal A carrier base in which a predetermined space is formed; A first cover coupled to one side of the carrier base and provided through the input shaft and the first output shaft; and a second cover coupled to the other side of the carrier base and provided through the second output shaft.

Description

reducer

The present invention relates to a reducer, and more specifically, to a reducer using a planetary gear and a reducer capable of being compact in which a differential gear is provided on a carrier including a carrier base, a first cover, and a second cover.

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

In order to obtain a compact and large reduction ratio by recently improving the mechanical structure, as published in US Patent US2019/0211908 A1 (hereinafter referred to as the cited document), a differential gear and a reducer are provided together in the carrier. .

However, in the cited literature, when the reducer and differential gear are composed of a planetary gear set, the reduction gear is composed of a multi-stage stepped gear. In the case of step gears, when manufacturing gears all at once, a radius at which the hob can move must be formed between the multi-stage gears. If the multi-stage gears are constructed separately, the multi-stage gears are not aligned with each other. Since the planetary gear set includes internal or external fixed gears, it is difficult to install multi-stage gears.

In addition, when one side of the multi-stage gear and the differential gear are placed in the same section, space interference for gear arrangement occurs on both sides of the differential gear and the reduction gear, which greatly limits gear formation. In addition, this type of carrier base is made of casting material. In the case of casting, processing is essential because the same center of gravity is not always maintained, and due to shape problems, it is not easy to maintain the center of gravity even through processing, causing rotation of the carrier. There is a problem that causes vibration and noise throughout the device.

The problem to be solved by the present invention is to solve the problems of the conventional reducer as described above. Separate gear alignment is not required when installing the reduction gear, the center of gravity problem is solved by easy processing of the carrier base, and the carrier base is easily processed. The purpose is to provide a reducer that minimizes interference during operation by arranging the reduction gear and differential gear within it.

In the reducer according to an embodiment of the present invention, a carrier accommodating a planet gear; an input shaft provided on one side of the carrier, receiving power from a motor and having gear teeth formed on the outside; A planetary gear unit that receives power from the input shaft; A differential gear unit that receives power from the planetary gear unit; and an output unit that is provided to penetrate the carrier, has gear teeth formed on the outside, and includes a first output shaft and a second output shaft that receive power from the differential gear unit, and the carrier has: an internal A carrier base in which a predetermined space is formed; A first cover coupled to one side of the carrier base and provided through the input shaft and the first output shaft; and a second cover coupled to the other side of the carrier base and provided through the second output shaft.

At this time, the planetary gear unit includes: a first gear provided inside the carrier base and receiving power from the input shaft; a second gear that penetrates the first cover and the second cover and protrudes to the outside of the carrier base, and engages with the first gear; and a fixed gear provided on the outside of the second cover, engaged with the second gear, and fixed to the reducer housing and not rotating. The second gear may be configured to include gear teeth formed on the fixed gear. tooth), and at the same time, the carrier can rotate about the horizontal axis by the second gear.

And the differential gear unit includes: a first differential gear provided inside the carrier base and including a third gear and a fourth gear that rotates about the horizontal 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. transmits power to the first output shaft, and the sixth gear transmits 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. It is coupled to the cover, the second gear penetrates the first gear and is rotatably coupled to the first cover and the second cover, the outside of the first gear is meshed with the outside of the input shaft, and the first gear The inside of may be engaged with the outside of the second gear.

In addition, the carrier: is provided inside the carrier base and further includes a pin connecting the first cover and the second cover, and the third gear and the fourth gear are provided on the pin, and the third gear and the fourth gear are provided on the pin. The third and fourth gears rotate around the horizontal axis together with the carrier, and may also rotate around the pin.

And the inside of the fifth gear is meshed with the outside of the first output shaft, the outside of the fifth gear is meshed with the outside of the third gear, the inside of the sixth gear is meshed with the outside of the second output shaft, and the sixth gear is meshed with the outside of the second output shaft. The outer side of the gear is meshed 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 sixth gear can be spaced apart by a predetermined distance.

At this time, the third gear and the fourth gear are formed with gear teeth extending to the second bearing provided between the fifth gear and the sixth gear, so that the third gear and the fourth gear are connected to each other. can be combined.

Additionally, the carrier base includes: a first hole formed through the second gear to accommodate the second gear; A guide end formed with a protruding end so that the first cover and the second cover are provided on both sides; a first end with a predetermined space formed on one side to accommodate the first gear; and a second end in which a predetermined space is formed on the other side to accommodate the third gear and the fourth gear, and a second hole is formed to accommodate the pin.

In addition, the number of teeth of the first gear may be 2 to 5 times that of the second gear, and the gear grooves of the second gear may be positioned in the same manner as the gear grooves of the first gear.

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

According to an embodiment of the present invention, compaction is possible by providing a planetary gear unit and a differential gear unit within a single carrier, and the 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 mounted on the carrier without a separate fastening device such as a bolt. By caulking, the pin is rotationally restricted and can be prevented from being detached from the carrier.

In addition, by extending the second gear to protrude outside the first and second covers, the planetary gear support structure applied to the conventional reducer can be omitted.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

1 is a perspective view of a reducer according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of a reducer according to an embodiment of the present invention.
Figure 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.
Figure 6 is a cross-sectional view of a reducer according to an embodiment of the present invention.
Figure 7 is a front view of a pin according to an embodiment of the present invention.
Figure 8 is a front view of the first cover and the second cover according to an embodiment of the present invention.
Figure 9 is a perspective view of the second gear according to an embodiment of the present invention.
Figure 10 is a diagram showing an external gear according to an embodiment of the present invention.
Figure 11 is a diagram showing an internal gear according to another embodiment of the present invention.
Figure 12 is a side view of a reducer according to an embodiment of the present invention.

Hereinafter, various embodiments of this document are described with reference to the attached drawings. However, this is not intended to limit the technology described in this document to specific embodiments, and should be understood to include various modifications, equivalents, and/or alternatives to the embodiments of this document. . In connection with the description of the drawings, similar reference numbers may be used for similar components.

In this document, expressions such as “have,” “may have,” “includes,” or “may include” refer to the existence of the corresponding feature (e.g., a numerical value, function, operation, or component such as a part). , and does not rule out the existence 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” includes (1) at least one A, (2) at least one B, or (3) it may refer to all cases including both at least one A and at least one B.

Expressions such as “first,” “second,” “first,” or “second,” used in this document can modify various components regardless of order and/or importance, and refer to one component. It is only used to distinguish from other components and does not limit the components. For example, a first user device and a second user device may represent different user devices regardless of order or importance. For example, a first component may be renamed a second component without departing from the scope of rights described in this document, and similarly, the second component may also be renamed to the first component.

A component (e.g., a first component) is “operatively or communicatively coupled with/to” or “connected to” another component (e.g., a second component). When "connected to" is mentioned, it should be understood that any component may be directly connected to the other component or may be connected through another component (eg, a third component). On the other hand, when a component (e.g., a first component) is said to be “directly connected” or “directly connected” to another component (e.g., a second component), the component and the It may be understood that no other component (e.g., a third component) exists between other components.

The reducer according to an embodiment of the present invention, which is installed on the inner rotor of a motor (not shown), which is the main source of driving force production in electric vehicles, etc., and performs deceleration and differential by directly receiving the driving force generated from the motor, etc., is shown in FIGS. 1 and 1 . As shown in Figure 2, a carrier 100 that accommodates a planet gear; An input shaft 200 provided on one side of the carrier 100, receives power from a motor, and has gear teeth formed on the outside; A planetary gear unit 300 that receives power from the input shaft 200; A differential gear unit 400 that receives power from the planetary gear unit 300; And a first output shaft 510 and a second output shaft 520 that are provided through the carrier 100, have gear teeth formed on the outside, and receive power from the differential gear unit 400. It may be configured to include an output unit 500 that includes.

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

In addition, since the output unit 500 is provided inside the input shaft 200 and spaced a predetermined distance apart from the input shaft 200, each can rotate without interference about the horizontal axis, and the output unit 500 is 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 provided through the input shaft 200 and the first output shaft 510 about the horizontal axis; and a second cover 130 coupled to the other side of the carrier base 110 and provided through the second output shaft 520 about the horizontal axis.

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

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

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

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

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

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

The planetary gear unit 300 is: A first gear 310 provided inside the carrier base 110 and receiving power from the input shaft 200; a second gear 320 that penetrates the first cover 120 and the second cover 130 and protrudes to the outside of the carrier base 110 and meshes with the first gear 310; and a fixed gear 330 that is provided on the outside of the second cover 130, engages with the second gear 320, and is fixed to the reducer housing (not shown) by welding, valves, pins, etc. and does not rotate. It can be configured as follows.

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

At this time, a bearing, etc. is provided between the fixed gear 330 and the second cover 130, so that the fixed gear 330 can be supported. And, as shown in FIG. 9, the second gear 320 may have gear teeth formed on the outside of the shaft in the form of a round bar with steps formed.

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

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

In order to transmit power by combining the first gear 310 with the second gear 320, gear teeth may be formed on the inner surface of the first gear 310, which is known to those skilled in the art. It can be easily changed by . In addition, a snap ring or power lock is provided on the outside of the second gear 320, so that the first gear 310 can be fixed 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 can be formed in a relationship that is 2 to 5 multiples of the second gear 320. there is.

The number of teeth of the first gear 310 is 2 to 5 times that of the first gear 320, and the positions of the gear grooves of the second gear with respect to the gear grooves 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 can be composed of multiples of the number.

For example, if the second gear 320 and the first gear 310 are formed with an arbitrary number of teeth other than the multiple relationship, the first gear 310 and the second gear 320 are combined. In this state, because the gear edge positions of the three first gears 310 and the gear edge positions of the second gear 320 are different, the fixed gear is engaged with the first gear 310 and the input shaft 200. In order to find each gear mountain that can be combined with 330, the positions of the first gear 310 and the second gear 320 must be searched for each assembly, which causes inconvenience and unnecessary cost.

Therefore, in the reducer according to an embodiment of the present invention, when the number of teeth of the first gear 310 is a multiple of the number of teeth of the second gear 320, regardless of the gear angle of the second gear 320, Since it is provided at the same position as the gear mount of the first gear 310, it can be easily assembled by aligning the gear mount of the first gear 310 and the second gear 320, respectively, without a dedicated assembly 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, the gear mountain is located at each multiple of the planetary gear, so a separate dedicated assembly jig is required. It can be easily assembled without anything.

The differential gear unit 400 is provided inside the carrier base 110 and includes a third gear 411 and a fourth gear 412 that rotate around the horizontal 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. It may be configured to include a differential gear 420.

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 is engaged with the outside of the first output shaft 510, and the outside of the fifth gear 421 is meshed with the outside of the first output shaft 510. It is meshed with the outside of the third gear 411, the inside of the sixth gear 422 is meshed with the outside of the second output shaft 520, and the outside of the sixth gear 422 is meshed 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 fifth gear 421 and the sixth gear 422 are spaced apart from each other by a predetermined distance. The third gear 411 and the fourth gear 412 may be meshed with their gear teeth by a predetermined distance apart from the fifth gear 421 and the sixth gear 422. In this case, forward and reverse rotation of the sixth gear 422 may be transmitted to the fifth gear 421 in a circular manner.

The reducer according to an embodiment of the present invention can be compactized by providing the differential gear unit 400 within the planetary gear unit 300, and can operate without interference between the differential gear unit 400 and the planetary gear unit 300. .

In addition, the carrier base of a conventional reducer, which is commonly manufactured using a casting material, is configured in a form that can be processed through milling or a lathe in an embodiment of the present invention, so that it can be used to reduce the risk of damage during operation of the reducer that may occur due to the casting material. Vibration and noise can be prevented.

Terms used in this document are merely used to describe specific embodiments and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions, unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in this document. Among the terms used in this document, terms defined in general dictionaries may be interpreted to have the same or similar meaning as the meaning they have in the context of related technology, and unless clearly defined in this document, have an ideal or excessively formal meaning. It is not interpreted as In some cases, even terms defined in this document cannot be interpreted to exclude embodiments of this document.

Of course, 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 do not reflect the technical idea or the technical spirit of the present invention. It should not be understood in isolation from the perspective.

Claims (11)

A carrier that accommodates a planet gear;
an input shaft provided on one side of the carrier, receiving power from a motor and having gear teeth formed on the outside;
A planetary gear unit that receives power from the input shaft;
A differential gear unit that receives power from the planetary gear unit; and
An output unit is provided to penetrate the carrier, has gear teeth formed on the outside, and includes a first output shaft and a second output shaft that receive power from the differential gear unit,
The carrier:
A carrier base having a predetermined space therein;
A first cover coupled to one side of the carrier base and provided through the input shaft and the first output shaft; and
It includes 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 that penetrates the first cover and the second cover and protrudes to the outside of the carrier base, and engages with the first gear; and
A fixed gear provided on the outside of the second cover, meshed with the second gear, and fixed to the reducer housing and does not rotate,
The second gear rotates along gear teeth formed on the fixed gear, and at the same time, the carrier rotates about the horizontal axis by the second gear. delete delete In claim 1,
The differential gear unit:
a first differential gear provided inside the carrier base and including a third gear and a fourth gear that rotates about a horizontal axis together with the carrier; and
A second differential gear is provided inside the carrier base and includes 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. In 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 can rotate. combined,
The second gear penetrates the first gear and is rotatably coupled to the first cover and the second cover,
A reducer characterized in that the outside of the first gear is meshed with the outside of the input shaft, and the inside of the first gear is meshed with the outside of the second gear. In claim 5,
The carrier:
It is provided inside the carrier base and further includes a pin connecting the first cover and the second cover,
The third gear and the fourth gear are provided on the pin, and the third gear and the fourth gear rotate within the carrier around the output unit and rotate around the pin. Reducer Features In claim 6,
The inside of the fifth gear is meshed with the outside of the first output shaft, and the outside of the fifth gear is meshed with the outside of the third gear,
The inside of the sixth gear is meshed with the outside of the second output shaft, and the outside of the sixth gear is meshed with the outside of the fourth gear,
A reducer characterized in that 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. In claim 7,
The third gear and the fourth gear are a reducer characterized in that the gear teeth are meshed by a predetermined distance apart from the fifth gear and the sixth gear. In claim 8,
The carrier base:
a first hole formed through the second gear to accommodate the second gear;
A guide end formed with a protruding end so that the first cover and the second cover are provided on both sides;
a first end with a predetermined space formed on one side to accommodate the first gear; and
A reducer including a second end where a predetermined space is formed on the other side to accommodate the third gear and the fourth gear, and a second hole is formed to accommodate the pin. In claim 9,
The number of teeth of the first gear is 2 to 5 times that of the second gear, and the gear grooves of the second gear are positioned the same as the gear grooves of the first gear. In claim 10,
A reducer wherein the number of teeth of the first gear, the second gear and the fixed gear is a multiple of the number of the first gear and the second gear provided at equal intervals around the circumference of the carrier.

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