Carrier structure comprising a plate laminated carrier housing

Abstract

The present invention relates to a carrier structure including a plate-stacked carrier housing, and a reduction gear set and a differential gear set using a planetary gear system are provided in the plate-stacked carrier housing. The carrier structure including the plate-stacked carrier housing according to the present invention can include a plate-stacked carrier for accommodating a reduction gear set and a differential gear set composed of a planetary gear system, an input shaft provided at one side of the carrier to receive power from a motor and formed with a gear at an outer side, the reduction gear set to receive power from the input shaft, the differential gear set to receive power from the reduction gear set, and left and right output shafts provided through the carrier and formed with gears at outer sides to receive power from the differential gear set. The present invention can achieve compactness by providing the reduction gear set and the differential gear set in the carrier, and a reduction ratio can be selected by forming a fixed gear with an internal gear or an external gear.

Description

TECHNICAL FIELD

[0001] The present application relates to a reducer including a carrier housing in a plate lamination type, and more particularly, to a carrier structure in a plate lamination type in which a carrier and iron plates are laminated to form a carrier housing for accommodating a reducer and a differential gear composed of a planetary gear system, the carrier is formed by fixing the laminated iron plates by a carrier pin, and the carrier including the planetary gear reducer and the planetary gear differential device achieving compactness can be configured by a minimum process. BACKGROUND

[0002] The existing reducer includes an input shaft, bevel gears provided at an output shaft, differential gears provided between the bevel gears in a power transmission manner, and a worm gear engaged with the differential gears.

[0003] In order to improve the mechanical structure and achieve compactness to obtain a greater reduction ratio, a carrier and gear structure in which the differential gears and the reducer are provided together in the carrier was disclosed as a prior art document (hereinafter, referred to as a comparative document) in Patent No. 10-2020-0166274.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] (Patent Document 1) Patent No. 10-2020-0166274 SUMMARY

[0007] Technical Problem

[0008] The present application aims to provide a carrier structure that can solve various processing problems occurring in the process of manufacturing an integrated carrier while maintaining the features and advantages disclosed in the above-mentioned comparative document, and to reduce manufacturing difficulty by configuring the carrier structure in a plate lamination form and by a minimum process, thereby improving manufacturing convenience and reducing manufacturing costs.

[0009] Technical Solution

[0010] The reducer according to an embodiment of the present application can include a carrier for accommodating a planetary gear, an input shaft provided at one side of the carrier to receive power from a motor and having a gear formed at an outer side, a reduction gear set composed of a planetary gear system receiving power from the input shaft, a differential gear set receiving power by rotating through the carrier provided with the reduction gear set, and left and right output shafts provided through the carrier and having gears formed at outer sides to receive power from the differential gear set.

[0011] In this case, the above-mentioned reduction gear set can include a first gear provided at the inner side of the carrier to receive power from the input shaft, a second gear penetrating the carrier and protruding to the outer side of the carrier to be combined with the first gear, and a fixed gear provided at the gear side of the second gear to be combined with the second gear to be fixed to a fixing member such as a housing of the reduction gear in a non-rotating manner.

[0012] Further, the above-mentioned differential gear set is provided at the inner side of the carrier, left and right differential planetary gears provided at the inner side of the carrier to revolve around the shaft together, and includes a left differential sun gear combined with the left differential planetary gear and a right differential sun gear combined with the right differential planetary gear, the left differential sun gear being able to transmit power to the left output shaft, and the right differential sun gear being able to transmit power to the right output shaft.

[0013] In the structure of the above-mentioned gear, the carrier is composed of a left carrier, a center carrier, and a right carrier, the left carrier and the center carrier are respectively composed of a plurality of iron plates stacked, and the left carrier and the center carrier are assembled by a carrier pin, and the right carrier is assembled and fixed to the center carrier.

[0014] Effects of the Invention

[0015] The embodiment of the present application can realize compactness by providing a reduction gear set and a differential gear set in the carrier, and can select a reduction ratio by composing a fixed gear with an internal gear or an external gear.

[0016] Further, since the differential planetary gear is provided at the second gear penetrating the carrier, the carrier pin provided to support the planetary gear is reduced to one, and thus the differential gear set composed of the planetary gear system is provided inside the carrier, so that the differential gear set and the reduction gear set can be provided inside the same carrier.

[0017] Further, the carrier is divided into a left carrier, a center carrier, and a right carrier, the left carrier and the center carrier are composed of a plurality of iron plates stacked, and the iron plates which can be purchased in the market are directly used as raw materials, and after being processed to the minimum extent, the assembly can be realized by stacking, so that the manufacturing difficulty can be relatively reduced and the manufacturing cost can be maximally reduced, the carrier pin supporting the differential planetary gear functions as an assembly pin for assembling the left carrier and the center carrier, so that the assembly elements can be reduced, and after being press-bent with respect to the right carrier, the right carrier can be assembled to the center carrier by welding or the like, so that the entire carrier can be composed by the minimum processing and the minimum assembly elements.

[0018] Also, the present application can form the same structure from the material that appears from the plate material with minimum processing, not a casting material that is generally used as a carrier material, and thus, can solve the imbalance problem of the carrier.

[0019] Also, the effects obtainable from the present application are not limited to the above-mentioned effects, and other effects not mentioned above will be clearly understood by those skilled in the art to which the present application pertains, from the following contents. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A sectional view of a reducer including a plate-stacked carrier according to an embodiment of the present application.

[0021] Figure 2 A perspective view of a reducer including a plate-stacked carrier according to an embodiment of the present application.

[0022] Figure 3 An exploded view of a carrier according to an embodiment of the present application.

[0023] Figure 4 and Figure 5 A perspective view of a carrier according to an embodiment of the present application.

[0024] Figure 6 A view showing a partial section of a carrier according to an embodiment of the present application.

[0025] Figure 7 A view showing a differential gear set according to an embodiment of the present application.

[0026] Figure 8 A perspective view of a first gear and a second gear according to an embodiment of the present application.

[0027] EXPLANATION OF REFERENCE NUMERALS

[0028] 10: Reducing gear set

[0029] 11: First gear

[0030] 12: Second gear

[0031] 13: Outer fixed gear

[0032] 20: Differential gear set

[0033] 21: Left differential sun gear

[0034] 22: Right differential sun gear

[0035] 23: Left differential planetary gear

[0036] 24: Right differential planetary gear

[0037] 24a: Differential planetary gear spacer

[0038] 25: left output shaft

[0039] 26: right output shaft

[0040] 30: carrier

[0041] 30a: carrier pin setting hole

[0042] 30b: reduction gear setting hole

[0043] 31: left carrier

[0044] 31a: first left carrier

[0045] 31b: second left carrier

[0046] 31c: third left carrier

[0047] 31d: fourth left carrier

[0048] 32: center carrier

[0049] 32a: first center carrier

[0050] 32b: second center carrier

[0051] 33: right carrier

[0052] 34: carrier pin

[0053] 40: bearing

[0054] 41: needle bearing DETAILED DESCRIPTION

[0055] Hereinafter, with reference to the accompanying drawings, an exemplary embodiment of a carrier structure including a plate laminated type carrier housing for embodying the object of the present application will be described. In describing the present embodiment, the same names and the same reference numerals will be used for the same structures, and additional description thereof will be omitted.

[0056] As Figure 1 a sectional view and Figure 2In the case where the present application is applied to an electric vehicle or the like, the present application can include an input shaft for receiving a driving force from a driving motor (not shown) or the like as a driving force generation main body, a reduction gear set 10 composed of a planetary gear system for receiving the driving force of the input shaft, a differential gear set 20 composed of a planetary gear system for transmitting the power reduced by the reduction gear set 10 to a left output shaft 25 and a right output shaft 26, a carrier 30 for housing the reduction gear set 10 and the differential gear set 20 and composed of a plurality of iron plates laminated, and the left output shaft 25 and the right output shaft 26 penetrating the carrier 30 and provided at the differential gear set 20.

[0057] As shown in FIG. 1, Figure 1 The carrier 30 is composed of a left carrier 31, a center carrier 32, and a right carrier 33, both sides of the left carrier 31 and the right carrier 33 are supported by bearings, a differential sun gear 21, 22 is provided in an inner space between the left carrier 31 and the right carrier 33, the left differential sun gear 21 and the right differential sun gear 22 are housed in a rotatable manner, a left differential planetary gear 23 and a right differential planetary gear 24 which are combined with the left differential sun gear 21 and the right differential sun gear 22 are provided in the same space, and the left differential sun gear 21 and the right differential sun gear 22 are combined with the left differential planetary gear 23 and the right differential planetary gear 24 and connected.

[0058] As shown in FIG. 1, Figure 1 or Figure 5 The carrier 30 can make the second gear 12 penetrate the left carrier 31 and the center carrier 32 of the carrier 30 in a rotatable manner through a reduction gear setting hole 30b, a space is formed between the center carrier 32 and the right carrier 33, a first gear 11 which is combined with the second gear 12 and transmits power is provided in the space in a rotatable manner, as shown in FIG. 1, Figure 1 or Figure 2 The right differential planetary gear 24 is provided in a rotatable manner with the second gear 12, a carrier pin setting hole 30a for setting the left differential planetary gear 23 is formed in the left carrier 31 and the center carrier 32 in the same manner, so that the carrier pin 34 cannot rotate in the carrier 30, so that the left differential planetary gear 23 is provided in a rotatable manner with the carrier pin 34. Also, as shown in FIG. 1, Figure 5 The right carrier 33 can be assembled and combined with the outer side groove of the center carrier 32.

[0059] The above-mentioned reduction gear set 10, as a structure formed by a planetary gear system, can include a first gear 11 provided at the inner side of the above-mentioned carrier 30 to receive power from the above-mentioned input shaft, a second gear 12 formed with a gear at one side and passing through the above-mentioned carrier 30 at the other side, the portion protruding at the other side being combined with the above-mentioned first gear 11 through a connecting member, and a fixed gear 13 fixed to a fixing member such as a reducer housing in a manner not to rotate by welding, bolts, pins, etc., and formed with a gear in the outer circumferential direction or the inner circumferential direction, and achieving gear combination with the above-mentioned second gear 12.

[0060] As shown in Figure 1 or Figure 8 , the above-mentioned first gear 11 is formed with a gear at the outer side to achieve gear combination with the above-mentioned input shaft, and formed with a hollow at the inner side to be combined with the above-mentioned second gear 12 and transmit power, and can be combined by welding, etc.

[0061] The above-mentioned second gear 12 is in a round bar shape, formed with a gear at one side, and the other side formed with a gear is combined with the above-mentioned first gear 11, and during the process of providing the left carrier 31 and the center carrier 32 passing through the above-mentioned carrier 30, a needle bearing 41 is supported by the outer side of the shaft in a round bar shape and provided at the above-mentioned carrier 30, and is supported in a rotatable manner by providing a bearing or a gasket at the face where the gear formed at the above-mentioned one side is combined with the above-mentioned first gear 11, respectively.

[0062] As shown in Figure 1 , Figure 2 , the above-mentioned fixed gear 13 is formed with an external gear at one side to achieve gear combination with the above-mentioned second gear 12, and can be provided with a bearing 40 supporting the above-mentioned carrier 30, and the other side can be provided in a manner not to rotate by welding, bolts, pins, etc., at a fixing member such as a reducer housing. Also, the above-mentioned external gear can be formed with an internal gear to achieve gear combination with the second gear 12 according to the use requirement and the reduction ratio.

[0063] The above-mentioned differential gear set 20, as a structure formed by a planetary gear system, can include a left differential sun gear 21 formed with a gear at the outer side and formed with a spline or the like connecting member at the inner side to transmit power and be combined with a left output shaft 25, a right differential sun gear 22 formed with a gear at the outer side and formed with a spline or the like connecting member at the inner side to transmit power and be combined with a right output shaft 26, a left differential planetary gear 23 combined with the above-mentioned left differential sun gear 21, and a right differential planetary gear 24 combined with the above-mentioned right differential sun gear 22 and the above-mentioned left differential planetary gear 23.

[0064] The left differential sun gear 21 is in a circular plate shape, has a gear formed on the outer side, is hollow on the inner side, and has a connecting member such as a spline formed in the hollow to transmit power to and combine with the left output shaft 25, and combines with the left output shaft 25.

[0065] The right differential sun gear 22 is in a circular plate shape, has a gear formed on the outer side, is hollow on the inner side, and has a connecting member such as a spline formed in the hollow to transmit power to and combine with the right output shaft 26, and combines with the right output shaft 26.

[0066] The left differential sun gear 21 and the right differential sun gear 22 are disposed facing each other inside the left carrier 31 and the center carrier 32 of the carrier 30, and a spacer or a bearing can be provided on the side facing each other. Also, the gears of the left differential sun gear 21 and the right differential sun gear 22 are spaced apart by a predetermined distance from the surface on which they are disposed facing each other.

[0067] The left differential planetary gear 23 is in a cylindrical shape that is hollow on the inner side, is formed in the carrier pin 34 or the like so as to be rotatable, and has a gear formed on a part of the outer side.

[0068] The right differential planetary gear 24 is in a cylindrical shape that is hollow on the inner side, is formed in the second gear 12 or the like so as to be rotatable, and has a gear formed on a part of the outer side.

[0069] The left differential planetary gear 23 and the right differential planetary gear 24 are disposed as shown in FIGS. 1 and 2, the right differential planetary gear 24 is disposed in the second gear 12 so as to be rotatable, and the left differential planetary gear 23 is disposed in the carrier pin 34 so as to be rotatable. Figure 1 Figure 7 The left differential planetary gear 23 and the right differential planetary gear 24 can be disposed in the second gear 12 and the carrier pin 34, respectively, in a direction rotated by 180 degrees, and the right differential planetary gear 24 can be disposed in the second gear 12 so as to be rotatable, and the left differential planetary gear 23 can be disposed in the carrier pin 34 so as to be rotatable.

[0070] ​As described above, in the differential gear set 20 having the above-described structure, the gears of the left differential sun gear 21 and the right differential sun gear 22 are spaced apart by a predetermined distance with the facing surfaces as the center, the gears extending to the outside of the left differential planetary gear 23 which is in gear engagement with the left differential sun gear 21 are formed to extend by the predetermined distance between the left differential sun gear 21 and the right differential sun gear 22, and the gears extending to the outside of the right differential planetary gear 24 which is in gear engagement with the right differential sun gear 22 are also formed to extend by the predetermined distance between the left differential sun gear 21 and the right differential sun gear 22. The left differential planetary gear 23 and the right differential planetary gear 24, whose gears extend by the predetermined distance between the left differential sun gear 21 and the right differential sun gear 22, are in gear engagement with each other in the extended gear portions, so that the left differential sun gear 21 and the right differential sun gear 22 circulate the positive rotation and the reverse rotation to each other to constitute the differential gear system.

[0071] As described above, the structure in which the gears of the left differential sun gear 21 and the right differential sun gear 22 are spaced apart by a predetermined distance with the facing surfaces as the center is merely an example, so that the left differential sun gear 21 and the right differential sun gear 22 and the left differential planetary gear 23 and the right differential planetary gear 24 are constituted as identical components without distinction between the left and the right, and, in order to constitute the left differential sun gear 21, the right differential sun gear 22, and the left differential planetary gear 23, the right differential planetary gear 24 as identical components, the space spaced apart by the predetermined distance can be formed on one side of the left side or the right side by concentrating the gears formed in the left differential sun gear 21 and the right differential sun gear 22 on the left side or the right side, and then, the left differential planetary gear 23 and the right differential planetary gear 24 formed in other forms can be used according to the structure and the requirements to constitute the differential gear set 20.

[0072] The left output shaft 25, which is a component directly connected to the drive wheel of the electric vehicle, transmits the driving force to the drive wheel by being connected to the hollow connecting component formed in the left differential sun gear 21.

[0073] The right output shaft 26, which is a component directly connected to the drive wheel of the electric vehicle, transmits the driving force to the drive wheel by being connected to the hollow connecting component formed in the right differential sun gear 22.

[0074] In particular, in the basic structure as described above, the carrier 30 constituted by the left carrier 31, the center carrier 32, and the right carrier 33 is formed as Figure 6As shown in the drawings, the left carrier 31 is formed by stacking a first left carrier 31a, a second left carrier 31b, a third left carrier 31c, and a fourth left carrier 31d. The first left carrier 31a, the second left carrier 31b, the third left carrier 31c, and the fourth left carrier 31d are circular iron plates having the same thickness and not requiring separate surface processing of both side surfaces. The first left carrier 31a, the second left carrier 31b, the third left carrier 31c, and the fourth left carrier 31d are formed with a carrier pin installation hole 30a and a reduction gear installation hole 30b at the same position. In particular, the inner side hollow of the fourth left carrier 31d is relatively smaller than the inner side hollows of the first left carrier 31a, the second left carrier 31b, and the third left carrier 31c, so as to prevent the bearing 40 installed in the carrier 30 from moving along the inner side of the carrier 30 by forming a step.

[0075] The center carrier 32 is formed by stacking a first center carrier 32a and a second center carrier 32b. The first center carrier 32a and the second center carrier 32b are circular iron plates having the same thickness and not requiring separate surface processing of both side surfaces. The first center carrier 32a and the second center carrier 32b are formed with a carrier pin installation hole 30a and a reduction gear installation hole 30b at the same position. The second center carrier 32b has a relatively smaller outer diameter than the first center carrier 32a, so as to be inserted into the right carrier 33.

[0076] The carrier pin 34 is installed in the carrier pin installation hole 30a of the left carrier 31 and the center carrier 32, and is fixed to the first left carrier 31a and the second center carrier 32b by welding or the like, thereby constituting the integrated carrier 30.

[0077] As described above, the center carrier 32 and the right carrier 33 are fixed to the first center carrier 32a by welding or the like, thereby constituting the integrated carrier 30, as the right carrier 33 is inserted into the outer diameter side of the second center carrier 32b.

[0078] In the carrier 30 having the above structure, the iron plates provided in a raw material state are stacked with minimum processing, without an additional stacking member, and the carrier pin 34 formed with the above step and the first left carrier 31a and the second central carrier 32b positioned on the opposite sides of the step are fastened in one body by welding or the like, whereby the left carrier 31 and the central carrier 32 can be assembled with minimum processing and welding, and the right carrier 33 formed in a shape by press bending or the like is inserted into the central carrier 32 to achieve assembly, and the central carrier 32 and the right carrier 33 can be integrated by one welding after assembly. This means that after all the above iron plates are formed by press processing, assembly by the carrier pin 34, gear arrangement, and then only three weldings are required to complete the assembly of the carrier 30 of the speed reducer, and thus, compared with the conventional carrier manufacturing method involving many processing steps, the same carrier can be manufactured with minimum processing and cost.

[0079] Also, since the carrier pin 34 supporting the left differential planetary gear 23 in a rotatable manner has a sufficient outer diameter, and in the aspect of supporting the left carrier 31 and the central carrier 32, the pin for supporting the carrier does not need to be separately provided, and the left carrier 31 and the central carrier 32 are supported by the above carrier pin 34, and thus, there is an advantage of reducing the processing steps and cost by reducing the assembly members.

[0080] The terms used in the present specification are used only to explain specific embodiments and do not have the meaning of limiting other embodiments. Unless explicitly indicated in the context, the expression of the singular can include the expression of the plural. The meaning of all the terms used herein, including technical terms or scientific terms, is the same as that understood by a person having ordinary knowledge in the technical field to which the present application pertains. Among the terms used in the present specification, the terms defined in a generally used dictionary should be interpreted to have the same meaning as that which the related art has in the context, and unless otherwise defined in the present specification, should not be interpreted in an idealized or overly formal sense. According to circumstances, the terms defined in the present specification should also not be interpreted in the meaning of excluding the embodiments of the present specification.

[0081] A person having ordinary knowledge in the technical field to which the present application pertains can make various modifications to the scope of the protection claimed by the present application without departing from the gist of the present application, and such modified embodiments should not be interpreted in the meaning of being understood from the technical idea or aspect of the present application.

Claims

1. A carrier structure comprising a laminated carrier shell, characterized in that, include: The input shaft receives external power and energy to rotate. The reduction gear set (10) is geared with the input shaft to receive power. It is composed of a planetary gear system including a first gear (11), a second gear (12) and a fixed gear (13). The second gear (12) is geared with the first gear (11), and the fixed gear (13) is geared with the second gear (12) and fixed to a fixed component including the housing of the reducer in a non-rotatable manner. The differential gear set (20) comprises a planetary gear system including a left differential sun gear (21), a right differential sun gear (22), a left differential planetary gear (23), and a right differential planetary gear (24). It includes a left output shaft (25) and a right output shaft (26) connected to and receiving power from the left differential sun gear (21) and the right differential sun gear (22). The left differential planetary gear (23) engages with the left differential sun gear (21), and the right differential planetary gear (24) engages with the right differential sun gear (22). The carrier (30) is capable of accommodating the aforementioned reduction gear set (10) and differential gear set (20) on its inner side. The aforementioned carrier (30) consists of three components: a left carrier (31), a central carrier (32), and a right carrier (33). The left carrier (31) and the right carrier (33) are supported on both sides by support bearings (40). The left carrier (31) and the central carrier (32) are supported and assembled by carrier pins (34). The central carrier (32) and the right carrier (33) are arranged on the outer circumference of the central carrier (32) by insertion assembly, so that the aforementioned reduction gear set (10) and differential gear set (20) can be accommodated inside the carrier (30). The aforementioned left-side carrier (31) is formed by stacking a first left-side carrier (31a), a second left-side carrier (31b), a third left-side carrier (31c), and a fourth left-side carrier (31d) with carrier pin mounting holes (30a) and reduction gear mounting holes (30b) formed at the same position on the circumference. The carrier pin (34) is provided in the aforementioned carrier pin setting hole (30a) of the stacked circular plates and serves as a guide. The first left carrier (31a) is fixed to one side of the carrier pin (34) by welding. Hollows for mounting bearings (40) are formed at the inner circumference center of the first left carrier (31a), the second left carrier (31b), and the third left carrier (31c). The fourth left carrier (31d) acts as a step to prevent the bearings (40) from moving along the center of the carrier.

2. The carrier structure including a laminated carrier shell according to claim 1, characterized in that, The first left-side carrier (31a), the second left-side carrier (31b), the third left-side carrier (31c), and the fourth left-side carrier (31d) are iron plates that do not require separate surface processing on both sides. The first left-side carrier (31a), the second left-side carrier (31b), and the third left-side carrier (31c) of the same shape can be replaced by one or more iron plates in a way that makes the thickness reach the sum of the thicknesses of the aforementioned iron plates.

3. The carrier structure including a plate-laminated carrier shell according to claim 1, characterized in that, The central carrier (32) is in the shape of a circular plate, with carrier pin mounting holes (30a) and reduction gear mounting holes (30b) formed at the same position on the circumference. It is formed by stacking a first central carrier (32a) and a second central carrier (32b). The carrier pin (34) is set in the aforementioned carrier pin mounting holes (30a) of the stacked circular plate and plays a guiding role. The second central carrier (32b) is fixed to the other side of the carrier pin (34) by welding. The right-side carrier (33) is arranged on the outer circumference of the second central carrier (32b) by insertion assembly and is assembled with the first central carrier (32a) by welding.

4. The carrier structure including a plate-laminated carrier shell according to claim 3, characterized in that, Apart from the outer diameter, the first central carrier (32a) and the second central carrier (32b) constituting the above-mentioned central carrier (32) have the same related factors. They are both iron plates that do not require separate surface processing on both sides. The first central carrier (32a) and the second central carrier (32b) can be replaced by an iron plate with a step formed along the outer circumferential direction of one side so that the thickness reaches the sum of the thickness of the above-mentioned iron plates. The right carrier (33) can be formed by bending the iron plate.

5. The carrier structure including a laminated carrier shell according to claim 1, characterized in that, The aforementioned carrier (30) also includes a carrier pin (34), which is fixedly disposed on the inner side of the aforementioned carrier (30). The right differential planetary gear (24) is mounted on the aforementioned carrier pin (34). The left differential planetary gear (23) is located on the second gear (12) mentioned above. The aforementioned left differential planetary gear (23) and right differential planetary gear (24) revolve together with the aforementioned carrier (30) around the shaft, and rotate around the aforementioned second gear (12) and carrier pin (34).

Images