Vehicle speed reduction apparatus

Abstract

A vehicle speed reduction apparatus of the present invention comprises: a housing unit; an input shaft, which is provided in the housing unit, is connected to a motor unit, and receives power from the motor unit and rotates; a plurality of bearing units which are mounted to be spaced apart from the input shaft, and which support the rotation of the input shaft; and an insulating unit which is arranged between the housing unit and the plurality of bearing units and which provides insulation between the housing unit and the bearing units.

Description

vehicle reduction gear

[0001] The present invention relates to a reduction device for a vehicle, and more particularly, to a reduction device for a vehicle that prevents electrocution.

[0002] Typically, reduction gears for electric vehicles are subject to electrolytic corrosion, which damages the bearings due to electric sparks generated on the surface when the current generated from the drive motor is transmitted to the bearings.

[0003] Conventional technology, when ceramicizing bearing balls to prevent galvanic corrosion, incurs significant costs. Furthermore, insulating the outer ring of a bearing is not only complex and difficult, but also prone to damage during transport and assembly, potentially reducing its insulating function. Therefore, improvements are needed.

[0004] The background technology for the present invention is disclosed in Korean Patent Publication No. 10-2019-0142573 (Title of invention: Reduction device for vehicle, Publication date: December 27, 2019).

[0005] The present invention was created due to the above-mentioned need, and its purpose is to provide a vehicle reduction device that prevents electrocution.

[0006] In order to achieve the above object, the vehicle reduction device of the present invention includes: a housing part; an input shaft installed in the housing part, connected to a motor part, and rotating by receiving power from the motor part; a plurality of bearing parts spaced apart from the input shaft and supporting rotation of the input shaft; and an insulation part arranged between the housing part and the plurality of bearing parts and insulating between the bearing parts and the housing part.

[0007] The housing portion has a bearing mounting portion on which the bearing portion is mounted, and the insulating portion can be integrally connected to the bearing mounting portion.

[0008] The above insulating portion comprises an insulating coating agent and can be applied to the bearing mounting portion.

[0009] The bearing part may include a bearing outer ring mounted on the bearing mounting part and in contact with the insulating part; a bearing inner ring disposed inside the bearing outer ring; and a plurality of balls disposed between the bearing outer ring and the bearing inner ring.

[0010] It may further include an input gear coupled to the input shaft and rotated by receiving the rotational force of the input shaft; an output gear meshed and coupled with the input gear and rotated by receiving the rotational force of the input gear; and a diff gear meshed and coupled with the output gear.

[0011] The vehicle reduction device according to the present invention can prevent electrical corrosion by insulating the bearing part and the housing part through an insulating part formed by applying an insulating coating to the bearing mounting part of the housing part, so that not only is damage to the bearing part prevented due to electrical corrosion, but also has the effect of preventing the occurrence of NVH noise and vibration.

[0012] In addition, the present invention not only simplifies the manufacturing process and reduces the manufacturing time, but also prevents damage to the insulation function during transportation and assembly, and has the effect of reducing the cost of parts.

[0013] FIG. 1 is a cross-sectional view showing a vehicle reduction device according to one embodiment of the present invention.

[0014] Figure 2 is an enlarged view of part A of Figure 1.

[0015] FIG. 3 is an enlarged view of a first bearing mounting portion on which a bearing portion is mounted in a vehicle reduction device according to one embodiment of the present invention.

[0016] FIG. 4 is an enlarged view of a second bearing mounting portion on which a bearing portion is mounted in a vehicle reduction device according to one embodiment of the present invention.

[0017] FIG. 5 is an enlarged view of a third bearing mounting portion on which a bearing portion is mounted in a vehicle reduction device according to one embodiment of the present invention.

[0018] Hereinafter, a vehicle reduction device according to one embodiment of the present invention will be described with reference to the attached drawings.

[0019] In this process, the thickness of lines and the sizes of components depicted in the drawings may be exaggerated for clarity and convenience. Furthermore, the terms described below are defined based on their functions within the present invention and may vary depending on the intent or custom of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0020] FIG. 1 is a cross-sectional view showing a vehicle reduction device according to one embodiment of the present invention, FIG. 2 is an enlarged view of part A of FIG. 1, FIG. 3 is an enlarged view of a first bearing mounting portion on which a bearing portion is mounted in a vehicle reduction device according to one embodiment of the present invention, FIG. 4 is an enlarged view of a second bearing mounting portion on which a bearing portion is mounted in a vehicle reduction device according to one embodiment of the present invention, and FIG. 5 is an enlarged view of a third bearing mounting portion on which a bearing portion is mounted in a vehicle reduction device according to one embodiment of the present invention.

[0021] Referring to FIGS. 1 to 5, a vehicle reduction device (1) according to one embodiment of the present invention includes a housing portion (100), an input shaft (200), a plurality of bearing portions (300), and an insulation portion (400). A motor portion (10) is installed inside the housing portion (100), and an input shaft (200) is rotatably mounted therein.

[0022] The housing part (100) has bearing mounting parts (111, 121, 131) on which the bearing part (300) is mounted. The housing part (100) has groove-shaped bearing mounting parts (111, 121, 131) formed spaced apart from each other, and a plurality of bearing parts (300) are mounted on each of them. At this time, the bearing mounting parts (111, 121, 131) are integrally connected to the insulating part (400) in the groove shape. Accordingly, insulation can be achieved between the bearing part (300) and the housing part (100).

[0023] Specifically, the housing part (100) includes a first housing part (110), a second housing part (120), and a third housing part (130). The first housing part (110) is mounted so that the motor part (10) surrounds the input shaft (200) inside. The first housing part (110) is arranged between the second housing part (120) and the third housing part (130) and is coupled with the second housing part (120) and the third housing part (130).

[0024] The first housing part (110) has a first bearing mounting part (111) on which a bearing part (300) is mounted. The first bearing mounting part (111) is integrally connected to an insulating part (400) in the shape of a groove.

[0025] The second housing part (120) is coupled with the first housing part (110), and an input shaft (200) is installed inside. At this time, the second housing part (120) can be coupled with the first housing part (110) by a coupling part (not shown) such as a bolt. The second housing part (120) has a second bearing mounting part (121) on which a bearing part (300) is mounted. The second bearing mounting part (121) is integrally coupled with an insulating part (400) in a groove shape.

[0026] The third housing part (130) is coupled with the first housing part (110), and an input shaft (200) is installed inside. At this time, the third housing part (130) can be coupled with the first housing part (110) by a coupling part (not shown) such as a bolt. The third housing part (130) has a third bearing mounting part (131) on which a bearing part (300) is mounted. The third bearing mounting part (131) is integrally coupled with an insulating part (400) in a groove shape.

[0027] The input shaft (200) is installed in the housing (100), connected to the motor (10), and rotates by receiving power from the motor (10). The input shaft (200) rotates by receiving power from the motor (10).

[0028] A plurality of bearing parts (300) are spaced apart from each other and mounted on the input shaft (200) and support the rotation of the input shaft (200). A plurality of bearing parts (300) are spaced apart from each other and mounted on the bearing mounting parts (111, 121, 131) of the housing part (100) and support the rotation of the input shaft (200).

[0029] The bearing part (300) surrounds the outside of the input shaft (200) and supports the input shaft (200) so that the input shaft (200) can rotate smoothly.

[0030] The bearing part (300) may include a bearing outer ring (310), a bearing inner ring (320), and a plurality of balls (330). The bearing outer ring (310) is mounted on a bearing mounting part (111, 121, 131) and is in contact with an insulating part (400). The bearing outer ring (310) surrounds a plurality of balls (330) and a bearing inner ring (320) in a ring shape.

[0031] The bearing inner ring (320) is placed inside the bearing outer ring (310). The bearing inner ring (320) is connected to the bearing outer ring (310) in a ring shape, and a plurality of balls (330) are mounted spaced apart along the outer circumference.

[0032] A plurality of balls (330) are arranged between the bearing outer ring (310) and the bearing inner ring (320). The plurality of balls (330) are mounted spaced apart from each other in the circumferential direction between the bearing outer ring (310) and the bearing inner ring (320).

[0033] The insulating part (400) is placed between the housing part (100) and the plurality of bearing parts (300), and insulates between the bearing parts (300) and the housing part (100). The insulating part (400) can prevent electricity transmitted from the motor part (10) through the input shaft (200) to the bearing part (300) from being transmitted to the housing part (100), thereby preventing corrosion from occurring.

[0034] Due to this, not only is damage to the bearing part (300) due to corrosion prevented, but NVH (Noise, Vibration, Harshness) noise and vibration can also be prevented from occurring.

[0035] The insulating portion (400) is integrally connected to the bearing mounting portion (111, 121, 131) of the housing portion (100). The insulating portion (400) includes an insulating coating agent and is applied to the bearing mounting portion (111, 121, 131). That is, the insulating portion (400) is applied to the bearing mounting portion (111, 121, 131) as an insulating coating agent to form an insulating layer, thereby more effectively insulating between the bearing portion (300) and the housing portion (100).

[0036] In this way, in the present invention, the insulating part (400) is formed by applying an insulating coating to the bearing mounting part (111, 121, 131) of the housing part (100), and unlike the conventional technology of insulating the bearing outer ring (310) of the bearing part (300) or using a ceramic ball (330), it is possible to prevent the insulating function from being damaged during the transportation and assembly process, thereby improving work efficiency and reducing the cost of parts.

[0037] A vehicle reduction gear (1) may further include an input gear (500), an output gear (600), and a diff gear (700). The input gear (500) is coupled to an input shaft (200) and rotates by receiving rotational force from the input shaft (200). The input gear (500) rotates together with the input shaft (200).

[0038] The output gear (600) is meshed with the input gear (500) and rotates by receiving the rotational force of the input gear (500). The output gear (600) rotates by receiving the rotational force from the input gear (500). The output gear (600) rotates in conjunction with the input gear (500), and the rotation is supported by a bearing (not shown).

[0039] The diff gear (700) is meshed with and connected to the output gear (600). The diff gear (700) rotates by receiving the rotational force of the output gear (600).

[0040] As described above, the vehicle reduction device (1) according to the present invention can prevent electrical corrosion by insulating the bearing portion (300) and the housing portion (100) through the insulating portion (400) formed by applying an insulating coating agent to the bearing mounting portion (111, 121, 131) of the housing portion (100). As a result, not only is damage to the bearing portion (300) due to electrical corrosion prevented, but also NVH noise and vibration can be prevented from occurring.

[0041] Furthermore, not only can the manufacturing process be simplified and the manufacturing time reduced, but damage to the insulation function during transportation and assembly can be prevented in advance, and the cost of parts can be reduced.

[0042] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

[0043] Therefore, the true technical protection scope of the present invention should be defined by the following patent claims.

Claims

1. Housing Department; An input shaft installed in the housing section, connected to the motor section, and rotated by receiving power from the motor section; A plurality of bearing parts spaced apart from the input shaft and supporting rotation of the input shaft; and A vehicle reduction device characterized by including an insulating part disposed between the housing part and a plurality of the bearing parts and insulating between the bearing parts and the housing part.

2. In paragraph 1, The above housing portion has a bearing mounting portion on which the bearing portion is mounted, A vehicle reduction device characterized in that the insulating part is integrally connected to the bearing mounting part.

3. In paragraph 2, A vehicle reduction device characterized in that the insulating part comprises an insulating coating agent and is applied to the bearing mounting part.

4. In paragraph 3, The above bearing part, A bearing outer ring mounted on the above bearing mounting portion and in contact with the above insulating portion; A bearing inner ring arranged inside the bearing outer ring; and A vehicle reduction device characterized by including a plurality of balls arranged between the bearing outer ring and the bearing inner ring.

5. In paragraph 1, An input gear coupled to the input shaft and rotating by receiving the rotational force of the input shaft; An output gear that is meshed with the input gear and rotates by receiving the rotational force of the input gear; and A vehicle reduction device further comprising a differential gear that is meshed with and connected to the output gear.

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