KR20240030040A - Inwheel motor having structure for leakage test - Google Patents

Abstract

The present invention relates to an in-wheel motor having an airtight inspection structure, which includes a fixed shaft, a rotor core rotatably disposed on the outer peripheral surface of the fixed shaft, a rim connected to the outer peripheral surface of the rotor core, and the rotor core coupled to both sides of the rim and in the central portion. A cover formed on the shaft hole through which the fixed shaft passes, an oil seal disposed between the shaft hole and the fixed shaft and sealing the inside of the rim, fastened between the cover hole formed on the cover and the plug hole formed on the rim, and the cover attached to the rim. A screw plug for coupling, an O-ring disposed between the cover hole and the screw plug, and a connection between the plug hole and the inner space formed by the rotor core and the cover so that air is injected from the plug hole into the inner space. It may be comprised of a confidentiality inspection department.

Description

In-wheel motor with airtight inspection structure {INWHEEL MOTOR HAVING STRUCTURE FOR LEAKAGE TEST}

The present invention relates to an in-wheel motor with an airtight inspection structure, and more specifically, to an in-wheel motor with a structure that allows simple inspection of the waterproof performance inside the in-wheel motor.

Generally, an in-wheel motor is a drive motor mounted on each wheel of an in-wheel drive system and supplies power to each wheel individually.

The in-wheel drive system uses a small motor individually mounted on each wheel instead of using a large single motor, so the drive system is simpler than other cars, allowing for greater interior space. In addition, the rotation of the wheels can be directly controlled, so a differential system is installed. It has the advantage of being able to omit complex power transmission devices such as.

Moreover, as the power transmission device can be omitted as described above, the in-wheel drive system can realize high efficiency and high performance of the vehicle.

In other words, the in-wheel drive system not only secures sufficient driving power by reducing power waste by directly mounting the in-wheel motor on the wheel of each wheel, but also distributes power to each in-wheel motor when driving the wheel and regenerative braking of each in-wheel motor when braking the wheel. As a result, the fuel efficiency of the vehicle can be improved by maximizing the recovery of braking energy.

Meanwhile, in-wheel motors applied to motorcycles or bicycles are exposed to the external environment and require waterproof performance to be used in heavy rain environments such as domestic or Southeast Asian markets.

To improve waterproofing performance, an oil seal is generally applied to the fixed shaft and a sealant is applied to the side cover. However, in the case of this structure, after assembly, it is not easy to check whether the waterproof performance is abnormal through an airtight inspection without disassembling the entire in-wheel motor.

Korean Patent Publication No. 10-2022-0105054

The present invention was created to solve the problems in the related technical field as described above, and the purpose of the present invention is to provide an in-wheel motor with a structure that can easily test the waterproof performance inside the in-wheel motor.

The present invention for achieving the above objects relates to an in-wheel motor having an airtight inspection structure, including a fixed shaft; a stator core disposed on the outer peripheral surface of the fixed shaft; a rotor core disposed surrounding an outer circumference of the stator core; A rim connected to the outer peripheral surface of the rotor core; A cover coupled to both sides of the rotor core and formed in the center portion of the shaft hole through which the fixed shaft passes; an oil seal disposed between the shaft hole and the fixed shaft and sealing the internal space formed by the rotor core and the cover; a screw plug that is fastened between a cover hole formed in the cover and a plug hole formed in the rotor core and couples the cover to the rotor core; an O-ring disposed between the cover hole and the screw plug; and an air tightness inspection unit that connects the internal space and the plug hole and allows air to be injected from the plug hole into the internal space.

Additionally, in an embodiment of the present invention, the air tightness inspection unit may be formed in the shape of a hole connecting the plug hole and the internal space.

In addition, in an embodiment of the present invention, a step protruding outward along the circumferential direction is formed around the rotor core, and the air tightness inspection unit cuts the step portion and may be formed to connect the plug hole and the internal space. .

Additionally, in an embodiment of the present invention, a sealant disposed between the rotor core and the cover to seal the space between the rotor core and the cover may be further included.

Additionally, in an embodiment of the present invention, the sealant may be bent and disposed in a radial direction outward from the plug hole at the periphery of the plug hole based on the center of the fixing axis.

According to the present invention, the waterproofing performance inside the in-wheel motor can be tested by a simple method of removing the screw plug from the plug hole of the in-wheel motor, connecting an air injection pipe to the plug hole, and injecting air.

Figure 1 is a perspective view showing the in-wheel motor of the present invention.
Figure 2 is a perspective cross-sectional view showing the in-wheel motor of the present invention.
Figure 3 is a diagram showing the air tightness inspection part in the in-wheel motor of the present invention.
Figure 4 is a diagram showing the arrangement of sealant in the in-wheel motor of the present invention.
Figures 5A to 5C are diagrams showing the process of removing the screw plug from the plug hole in the in-wheel motor of the present invention and connecting the air injection pipe to inspect the air tightness inside the in-wheel motor.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as '~on top', '~at the top', '~at the bottom', '~next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

Although first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the components shown.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be fully understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other. It may be possible to conduct them together due to a related relationship.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the attached drawings. A plurality of embodiments described below may be applied overlappingly as long as they do not conflict with each other.

Referring to Figures 1 to 4, the in-wheel motor 100 having an airtight inspection structure according to the present invention includes a fixed shaft 130, a stator core 136, a rotor core 180, a rim 120, a cover 110, It may include an oil seal 131, a screw plug 150, an O-ring 170, a sealant 190, and an airtight inspection unit 200.

The fixed shaft 130 may be a shaft that supports the stator core 136, and the power line P may be disposed to pass through the inside of the fixed shaft 130. The power line (P) is electrically connected to the stator core 136 and can supply power to the stator core 136.

The stator core 136 may be disposed on the outer peripheral surface of the fixed shaft 130. The stator core 136 is fixed with the fixed shaft 130, and when power is supplied through the power line (P), the rotor core 180 can be rotated through electromagnetic induction.

The rotor core 180 may have a ring shape and may be arranged to surround the outer circumference of the stator core 136. The rotor core 180 can rotate by electromagnetic induction with the stator core 136. Referring to FIG. 4, a stepped portion 181 protruding outward along the circumferential direction may be formed around the rotor core 180. In addition, a plurality of plug holes 160 may be disposed in the step portion 181 at predetermined intervals along the circumferential direction.

The rim 120 may be disposed on the outer peripheral surface of the rotor core 180. A vehicle wheel may be connected to the outer circumference of the rim 120. The rim 120 can rotate the wheel while rotating together with the rotor core 180.

The cover 110 may have a generally disk shape and may be coupled to both sides of the rotor core 180. An axial hole 113 through which the fixed shaft 130 passes may be formed in the central portion. Here, bearings 133 and 134 may be disposed inside the shaft hole 113, and the bearings 133 and 134 may support the cover 110 and allow the cover 110 to rotate smoothly. Since the cover 110 is connected to the rotor core 180, it can rotate together with the rotor core 180.

The oil seal 131 is a fluid sealing like oil and can be placed between the shaft hole 113 and the fixed shaft 130, and the rotor core 180 and the cover 110 coupled to both sides of the rotor core 180. The internal space 140 formed can be sealed.

The screw plug 150 is fastened between the cover 111 formed on the cover 110 and the plug hole 160 formed on the rotor core 180, and can couple the cover 110 to the rotor core 180. A plurality of screw plugs 150 may be arranged, and in this case, they may be arranged at predetermined intervals along the circumferential direction.

The O-ring 170 may be disposed between the cover 111 and the screw plug 150. Referring to Figure 5b, a sealing groove 112 may be formed around the outer circumference of the cover 111, and the O-ring 170 is disposed in the sealing groove 112, between the cover 111 and the screw plug 150. can be sealed.

The air tightness inspection unit 200 connects the internal space 140 and the plug hole 160 and may be a part through which air is injected from the plug hole 160 into the internal space 140. Referring to FIG. 4, in an embodiment of the present invention, the air tightness inspection unit 200 may be in the shape of a hole connecting the plug hole 160 and the internal space 140.

At this time, as described above, since the stepped portion 181 is formed around the rotor core 180, the air tightness inspection unit 200 cuts the stepped portion 181 to create the plug hole 160 and the internal space 140. It can be configured to connect.

The sealant 190 is a sealant and may be disposed along the circumferential direction between the rotor core 180 and the cover 110 to seal between the rotor core 180 and the cover 110.

In an embodiment of the present invention, referring to FIG. 4, the sealant 190 is bent in the outer radial direction of the plug hole 160 at the periphery of the plug hole 160 with respect to the center of the fixed axis 130 and is disposed. You can. This is to prevent the sealant 190 from passing through the air tightness inspection unit 200. As the sealant 190 is disposed to bypass the outer radial direction of the plug hole 160, when air is injected by connecting the air injection pipe 300 as shown in FIG. 5C, the air flowing into the air tightness inspection unit 200 The sealant 190 does not interfere with the flow.

Here, the plughole 160 in which the airtightness inspection unit 200 is formed may be one of a plurality of plugholes, and the sealant 190 may be disposed while being bent in an outward radial direction only at the periphery of the plughole 160 where the airtightness test is performed. .

The configuration of the present invention is as described above, and the airtightness inspection method will be described below.

Referring to FIG. 5A, it can be seen that the screw plug is fastened to the plug hole 160 and the cover 111 before performing the air tightness test. An air tightness inspection unit 200 may be formed in a specific plug hole 160 shown in cross section in the drawing.

Before performing the airtightness test, an oil seal 131 is installed between the fixed shaft 130 and the shaft hole 113, a sealant 190 is installed between the cover 110 and the rotor core 180, and the cover 111 and screw plug 150 are installed. ) O-rings 170 are disposed between each, and the internal space 140 can be sealed.

In order to check the waterproof performance of the in-wheel motor 100, it is necessary to inspect the airtightness of the internal space 140.

To this end, referring to FIG. 5b, the screw plug 150 is removed from the plug hole 160 and the cover 111. Then, the air injection pipe 300 is inserted into the cover 111 and the plug hole 160. At this time, the front end 310 of the air injection pipe 300 is inserted into the cover 111 and the plug hole 160. The front end 310 of the air injection pipe 300 may be the same size as the screw plug 150.

And the protrusion 320 is located adjacent to the sealing groove. Referring to FIG. 5C, it contacts the O-ring 170 and seals the space between the cover 111 and the protrusion 320.

Referring to FIG. 5C, it can be seen that the front end portion 310 is inserted into the cover 111 and the plug hole 160. And since the O-ring 170 is disposed between the cover 111 and the protrusion 320, the space between the cover 111 and the protrusion 320 is sealed, so the air injected from the air injection pipe 300 passes through the cover 111. does not leak through

Now, when air is injected through the air injection pipe 300 as shown by the arrow, the air flows into the air tightness inspection unit 200 through the plug hole 160. And it flows into the internal space 140 connected by the air tightness inspection unit 200.

As air flows into the internal space 140, pressure is applied to the inside of the in-wheel motor 100. At this time, gas leakage is measured using a separate measuring device to confirm airtightness.

The present invention has the technical feature of being able to check the airtightness and waterproof performance of the in-wheel motor 100 more simply than before through the above-mentioned configuration and inspection method.

The above merely shows a specific embodiment of an in-wheel motor with an airtight inspection structure.

Therefore, we wish to make it clear that those skilled in the art can easily understand that the present invention can be substituted and modified in various forms without departing from the spirit of the present invention as set forth in the claims below. do.

100: In-wheel motor
110: cover 111: cover hole
113: Shaft hole 120: Rim
130: Fixed shaft 131: Oil seal
136: Stator core 140: Internal space
150: Screw plug 160: Plug hole
170: O-ring 180: Rotor core
181: Stepped part 190: Sealant
200: Airtightness inspection department 300: Air injection pipe

Claims (5)

fixed axis;
a stator core disposed on the outer peripheral surface of the fixed shaft;
a rotor core disposed surrounding an outer circumference of the stator core;
A rim connected to the outer peripheral surface of the rotor core;
A cover coupled to both sides of the rotor core and formed in the center portion of the shaft hole through which the fixed shaft passes;
an oil seal disposed between the shaft hole and the fixed shaft and sealing the internal space formed by the rotor core and the cover;
a screw plug that is fastened between a cover hole formed in the cover and a plug hole formed in the rotor core and couples the cover to the rotor core;
an O-ring disposed between the cover hole and the screw plug; and
an air tightness inspection unit that connects the internal space and the plug hole and allows air to be injected from the plug hole into the internal space;
An in-wheel motor having an airtight inspection structure including a.
According to paragraph 1,
The confidentiality inspection department,
An in-wheel motor having an airtight inspection structure formed in the shape of a hole connecting the plug hole and the internal space.
According to paragraph 2,
A stepped portion protruding outward along the circumferential direction is formed around the rotor core,
An in-wheel motor having an airtight inspection structure wherein the airtight inspection unit cuts into the step portion and is formed to connect the plug hole and the internal space.
According to paragraph 1,
An in-wheel motor having an airtight inspection structure, further comprising a sealant disposed between the rotor core and the cover to seal between the rotor core and the cover.
According to paragraph 4,
The in-wheel motor having an airtight inspection structure, wherein the sealant is bent and disposed in a radial direction outside the plug hole at the periphery of the plug hole based on the center of the fixed axis.