In-wheel motor having hollow structure

Abstract

The present invention relates to an in-wheel motor having a hollow structure, the in-wheel motor having a simplified interior structure due to a hollow housing unit, to be fixed to a moving means, and a resolver housing disposed on the outer circumferential surface of the housing unit, and thus reducing the total weight of the motor, reducing manufacturing costs, and further improving assemblability.

Description

In-wheel motor with a hollow structure

[0001] The present invention relates to an in-wheel motor with a hollow structure.

[0002] In-wheel motors are used in means of transportation that use electricity as a power source. For example, in-wheel motors can be applied to eco-friendly means of transportation such as electric vehicles and electric motorcycles. Conventional internal combustion engine or electric means of transportation utilized a drive system employing an engine, transmission, motor, and shaft.

[0003] However, this method can result in power loss because it requires transmitting power from the engine to the wheels. To prevent this power loss, in-wheel motors and in-wheel motor systems containing them (also known as “in-wheel units”) are gaining popularity.

[0004] Since the drivetrain is positioned on the wheels, the design of the means of transportation is simplified and space utilization efficiency can be improved. Additionally, because individual control is possible for each in-wheel motor system, driving stability is good and power loss can be minimized.

[0005] However, conventional in-wheel motors have a structure in which the inside of the wheel is blocked by a cover and the shaft transmitting driving force is fixed to the center of the wheel, which resulted in heavy weight and poor space utilization.

[0006] The present invention has been devised to solve the aforementioned problems, and the objective of the present invention is to provide an in-wheel motor with a hollow structure that can reduce the overall load of the motor and lower manufacturing costs, as well as further improve assembly, by forming the housing part fixed to the moving means in a hollow shape and simplifying the internal structure by placing the resolver housing on the outer surface of the housing part.

[0007] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0008] An in-wheel motor with a hollow structure according to the present invention for solving the above problem comprises: a housing portion having a hollow internal shape and fixed to the front and rear frames of a moving means; a resolver housing coupled to the outer surface of a first stator housing of the housing portion, wherein a resolver rotor rotates together with the first rotor housing to measure and control the speed and position of the motor; and bearings each mounted on the outer surface of the housing portion, wherein the resolver rotor of the first rotor housing, the second rotor housing, the rotor cover, and the resolver housing rotates on the outside of the housing portion.

[0009] The above housing portion includes a first stator housing with an internal through-hole; a second stator housing that is in close contact with one side of the first stator housing and is coupled to it; and a fixing piece formed on the outer side of the first stator housing and the second stator housing to which the frame of the moving means is fixed.

[0010] The above resolver housing includes a resolver rotor that rotates while fixed to the first rotor housing and the rotor cover; and a resolver stator that is fixed to the outer surface of the first stator housing of the housing portion.

[0011] It includes an outer uneven surface formed by radially protruding from the inner circumference of the resolver rotor; and an inner uneven surface formed on the inner circumference of the resolver rotor between the outer uneven surfaces.

[0012] The above resolver stator is formed within a 45° range relative to the center of the housing part.

[0013] According to the present invention, by forming a housing part fixed to a moving means in a hollow shape and positioning a resolver housing on the outer surface of the housing part, the internal structure of the motor is simplified, thereby reducing the load of the motor and lowering manufacturing costs, and further improving assembly ease.

[0014] FIG. 1 is a drawing in which a hollow-structured in-wheel motor according to one embodiment of the present invention is applied to a means of transportation.

[0015] FIG. 2 is a perspective view of an in-wheel motor with a hollow structure according to an embodiment of the present invention.

[0016] FIG. 3 is an exploded perspective view of an in-wheel motor with a hollow structure according to an embodiment of the present invention.

[0017] FIG. 4 is a cross-sectional view of an in-wheel motor with a hollow structure according to an embodiment of the present invention.

[0018] Figure 5 is a cross-sectional view along line B-B' of Figure 4.

[0019] FIG. 6 is an enlarged view showing the resolver rotor of the present invention.

[0020] Figure 7 is a cross-sectional view along line C-C' of Figure 4.

[0021] FIG. 8 is an enlarged view of the bearing of the present invention mounted.

[0022] The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that various embodiments of the invention are different but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in relation to one embodiment. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not intended to be limiting, and the scope of the invention is limited only by the appended claims, including all equivalents to those claimed therein, provided appropriately described. Similar reference numerals in the drawings refer to the same or similar functions across various aspects.

[0023] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

[0024] First, FIG. 1 is a drawing showing a hollow-structured in-wheel motor according to an embodiment of the present invention applied to a means of transportation. FIG. 2 is a perspective view of a hollow-structured in-wheel motor according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a hollow-structured in-wheel motor according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a hollow-structured in-wheel motor according to an embodiment of the present invention.

[0025] An in-wheel motor (A) with a hollow structure according to one embodiment of the present invention includes a housing part (100), a resolver housing (200), and a bearing (400).

[0026] The above housing part (100) has a hollow part (100') that penetrates the interior, and the frame (2) of the moving means (1) can be fixed to the outside of one or both sides of the housing part (100).

[0027] Even if the means of movement (1) is fixed to the housing part (100), there is no structure blocking the hollow part (100').

[0028] The housing portion (100) may include a first stator housing (110) and a second stator housing (120).

[0029] The first stator housing (110) and the second stator housing (120) are positioned inside the wheel of the moving means (1) and fixed so as not to rotate.

[0030] The first stator housing (110) is a cylindrical tube with an internal opening.

[0031] A stator (13) is fixed to one side of the outer surface of the first stator housing (110), and a coil (14) can be wound around the stator (13).

[0032] The above coil (14) can generate a magnetic field by supplying electrical energy from a battery outside the motor.

[0033] Here, the stator (13) and the coil (14) wound around the stator (13) do not rotate.

[0034] On the outer surface of the first stator housing (110), the first rotor housing (10) and the resolver rotor (210) of the resolver housing (200) are connected via a bearing (400) so that they can rotate.

[0035] Here, a resolver rotor (210) is attached to the other side of the first rotor housing (10) and fixed via a bolt, and a rotor cover (30) is attached to the outer side of the resolver rotor (210) and fixed via a bolt (b).

[0036] A rotor (11) is coupled to the inner surface of the first rotor housing (10) in a circular ring shape, and a plurality of magnets (12) are coupled radially to the inner surface of the rotor (11), such that the N pole and S pole may be arranged alternately.

[0037] Accordingly, when current flows through the coil, the magnetic field of the magnet (12) and the magnetic field generated in the coil through which the current flows interact to generate rotational torque.

[0038] Mounting grooves (111) and (121) are formed on the outer surfaces of the first stator housing (110) and the second stator housing (120), respectively.

[0039] A bearing (400) is coupled to the above mounting groove (111)(121) so that the first rotor housing (10), the second rotor housing (20), the rotor cover (30), and the resolver rotor (210) can rotate on the outside of the housing part (100).

[0040] On the opposite side of the first stator housing (110) to which the stator (14) is coupled, a coupling portion (112) to which an oil seal (40) is coupled is formed.

[0041] That is, since a bearing (400) is mounted between the housing part (100) consisting of the first stator housing (110) and the second stator housing (120) and the first rotor housing (10), the second rotor housing (20), the rotor cover (30), and the resolver rotor (210), the housing part (100) is in a fixed state, and the first rotor housing (10), the second rotor housing (20), the rotor cover (30), and the resolver rotor (210) are in a rotating state.

[0042] The second stator housing (120) can be attached to one side of the first stator housing (110).

[0043] The second rotor housing (20) and the rotor cover (30) are coupled to the outer surface of the second stator housing (120) so that they can rotate.

[0044] Here, the second rotor housing (20) is fixed by a bolt (b) with one side of the first rotor housing (10) in close contact, and the second rotor housing (20) is fixed to the rotor cover (30) through a bolt (b).

[0045] A packing may be installed between the second rotor housing (20) and the rotor cover (30).

[0046] A resolver rotor (210) is attached to the other side of the first rotor housing (10) and fixed via a bolt, and a rotor cover (30) is attached to the resolver rotor (210) and fixed via a bolt.

[0047] An oil seal (40) may be coupled to the coupling portion (112) formed in the first stator housing (110), and a dust cover (50) that blocks the inflow of foreign matter may be fixed to the first stator housing (110) outside the oil seal (40). Here, the dust cover (50) is fixed to the first stator housing (110) so that it does not rotate.

[0048] The first stator housing (110) and the second stator housing (120) can be fixed to each other.

[0049] A connecting piece (130) may be formed protruding from the inner surface of the first stator housing (110).

[0050] A connecting piece (130) is formed to protrude in the same manner on the inner surface of the second stator housing (120) so as to face the first stator housing (110).

[0051] A bolt hole is formed in the connecting piece (130) so that a bolt and a nut can be fixed.

[0052] With the first stator housing (110) and the second stator housing (120) in close contact with each other, the connecting piece (130) of the first stator housing (110) and the connecting piece (130) of the second stator housing (120) are positioned in the same line, and then the first stator housing (110) and the second stator housing (120) can be fixed as a single unit by fastening a bolt and a nut.

[0053] The above fixing piece (140) is for fixing the first stator housing (110) and the second stator housing (120), which are fixed to each other through bolts and nuts, to the frame (2) of the moving means (1).

[0054] The fixing piece (140) is formed to protrude from the inner surface of the first stator housing (110) and the second stator housing (120).

[0055] A bolt hole is formed in the fixing piece (140) so that a bolt and a nut can be fixed.

[0056] The outer surface of the fixing piece (140) can be formed in alignment with the outer surfaces of the first stator housing (110) and the second stator housing (120). Accordingly, the frame (2) of the moving means (1) can be fixed to the fixing piece (140) on the outside of the motor.

[0057] The frame (2) of the above-mentioned moving means (1) may be fixed only to the fixing piece (140) formed in the first stator housing (110), or it may be fixed together to the fixing piece (140) of the first stator housing (110) and the second stator housing (120).

[0058] That is, since the frame (2) of the means of transport (1) is not installed by penetrating the interior of the housing part (100) but is fixed to the outer surface of the housing part (100), the structure of the motor can be simplified while maintaining the hollow part (100') of the housing part (100), and the weight can be reduced.

[0059] A fixing groove (150) may be formed on the outer surface of the first stator housing (110) of the housing part (100).

[0060] The above fixing groove (150) is a groove formed to fix the resolver stator (220).

[0061] The fixed groove (150) is formed on the outer surface of the first stator housing (110), but may be formed in a portion of the section.

[0062] The fixing groove (150) and the coupling portion (112) are formed on the outer surface of the first stator housing (110), and an oil seal (40) is coupled to the coupling portion (112). The fixing groove (150) is formed to be recessed from the coupling portion (112) into the inside of the first stator housing (110) so that the resolver stator (220) is fixed, and the resolver stator (220) does not interfere with the oil seal (40).

[0063] With the resolver stator (220) seated in the fixing groove (150), the resolver stator (220) can be fixed to the first stator housing (110) by fastening a bolt.

[0064] Additionally, referring to FIGS. 6 and 7, the resolver housing (200) is positioned on the outer surface of the first stator housing (110) of the housing portion (100) and configured to measure depth through the resolver stator (220). Through the measured depth, the resolver stator (220) can measure the speed and position of the motor.

[0065] The above resolver housing (200) includes a resolver rotor (210) and a resolver stator (220).

[0066] The above resolver rotor (210) is formed in a circular ring shape and is in close contact with the other side of the first rotor housing (10), and the resolver rotor (210) and the first rotor housing (10) can be fixed by bolt connection.

[0067] The outer surface of the resolver rotor (210) is in close contact with the rotor cover (30), and the resolver rotor (210) and the rotor cover (30) can be fixed by bolt connection.

[0068] The resolver rotor (210) is integrated with the first rotor housing (10) and the rotor cover (30) and rotates by means of a bearing (400).

[0069] The resolver rotor (210) includes an outer uneven surface (211) and an inner uneven surface (212).

[0070] The above outer uneven surface (211) can be formed on the inner circumference of the resolver rotor (210).

[0071] The outer uneven surface (211) is formed to protrude radially and can be spaced 1.5 to 2 mm apart from one side of the resolver stator (220), and it is preferable to be spaced at least 0.5 mm apart.

[0072] The inner uneven surface (212) is formed between the outer uneven surface (211) and is integrated with the resolver rotor (210), and can be spaced apart from one side of the resolver stator (220) by a distance of 4 to 10 mm.

[0073] Accordingly, when an electrical signal is given from the resolver stator (220) to the resolver rotor (210) during the rotation of the motor, the resolver stator (220) can detect the rotational speed and position of the motor depending on the distance at which the electrical signal is received, because the distance between the outer uneven surface (211) and the inner uneven surface (212) is different.

[0074] A fixing projection (230) may be formed on the inner surface of the resolver rotor (210) in the direction opposite to the inner uneven surface (212), that is, in the direction in close contact with the first rotor housing (10).

[0075] The above fixed jaw (230) is formed to secure the resolver rotor (210) to the bearing (400).

[0076] The fixed jaw (230) can be formed symmetrically with the fixed jaw (not shown) formed on the inner circumference of the first rotor housing (10).

[0077] Accordingly, the bearing (400) can be coupled to the mounting groove (111) of the housing part (100) and the fixing jaw (230) formed on the inner circumference of the resolver rotor (210).

[0078] The above resolver stator (220) can be fixed to the outer surface of the first stator housing (110) of the housing part (100).

[0079] The resolver stator (220) can be formed from a PCB substrate.

[0080] A pattern is printed on one side of the resolver stator (220) to serve as a sensor, and the side on which the pattern is printed may be the side facing the resolver rotor (210). The resolver stator (220) may face the resolver rotor (210) at a distance of 4 to 10 mm.

[0081] Accordingly, by continuously sending an electrical signal from the resolver stator (220) to the resolver rotor (210) and measuring the depth through the transmitted and received signal, the speed and position of the motor can be detected.

[0082] The resolver stator (220) is not formed over the entire outer surface of the first stator housing (110), but can be formed within a 45° range relative to the center of the first stator housing (110).

[0083] That is, the resolver stator (220) is fixed integrally with the first stator housing (110) and is formed only in a portion of the first stator housing (110), so manufacturing costs can be reduced and space utilization can be increased. Since the resolver stator (220) is structured to be fixed to the outer surface of the first stator housing (110), the hollow portion (100') of the housing portion (100) can be maintained.

[0084] Referring to FIG. 8, the bearing (400) is mounted on the outer surface of the first stator housing (110) and the second stator housing (120), respectively.

[0085] The bearing (400) can rotate the first rotor housing (10), the second rotor housing (20), the rotor cover (30), and the resolver rotor (210).

[0086] The bearing (400) is mounted in the mounting grooves (111) (121) formed on the outer surface of the first stator housing (110) and the second stator housing (120).

[0087] Accordingly, the first stator housing (110) and the second stator housing (120) are located on the inner side of the bearing (400), and the first rotor housing (10), the second rotor housing (20), the rotor cover (30), and the resolver rotor (210) are located on the outer side of the bearing (400).

[0088] Accordingly, when electrical energy is supplied to the coil (14) wound on the stator (13) and the motor rotates, the first and second stator housings (110) (120) become fixed, and the first rotor housing (10), second rotor housing (20), rotor cover (30), and resolver rotor (210) are guided by the bearing (400) and rotate.

[0089] That is, the present invention is configured such that the resolver housing (200) is positioned on the outer surface of the first stator housing (110), and the resolver rotor (210) is rotated by a bearing (400) on the outer surface of the first stator housing (110), thereby allowing the internal space of the housing portion (100) to be maintained as a hollow portion (100'), which simplifies the internal structure, thereby reducing the load of the motor and reducing manufacturing costs, as well as improving assembly.

[0090] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the invention as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention.

Claims

1. Regarding in-wheel motors, A housing part (100) having a hollow interior and fixed to the front and rear frames (2) of the moving means (1); A resolver housing (200) coupled to the outer surface of the first stator housing (110) of the housing part (100) so that the resolver rotor (210) rotates together with the first rotor housing (10) to measure and control the speed and position of the motor; A hollow in-wheel motor comprising a bearing (400) that is mounted on the outer surface of the housing portion (100) and allows the first rotor housing (10), the second rotor housing (20), the rotor cover (30), and the resolver rotor (210) of the resolver housing (200) to rotate on the outside of the housing portion (100).

2. In Claim 1, The above housing part (100) is, A first stator housing (110) through which the interior is penetrated; A second stator housing (120) that is in close contact with one side of the first stator housing (110) and coupled to each other; An in-wheel motor with a hollow structure comprising a fixing piece (140) formed on the outer side of the first stator housing (110) and the second stator housing (120) to which the frame (2) of the moving means (1) is fixed.

3. In Claim 1, The above resolver housing (200) is, A resolver rotor (210) that rotates while fixed to the first rotor housing (10) and rotor cover (30); A hollow in-wheel motor including a resolver stator (220) fixed to the outer surface of the first stator housing (110) of the housing part (100).

4. In Claim 3, An outer uneven surface (211) formed by radially protruding from the inner circumference of the above resolver rotor (210); An in-wheel motor with a hollow structure including an inner uneven surface (212) formed on the inner circumference of a resolver rotor (210) between the outer uneven surfaces (211) above.

5. In Claim 3, The above resolver stator (220) is, An in-wheel motor with a hollow structure formed within a 45° range relative to the center of the housing part (100).

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