Reducer-equipped motor unit

Abstract

To provide an electric motor unit with a speed reducer that can be installed in a free attitude and increase the degree of freedom in designing a self-propelled vehicle.SOLUTION: An electric motor unit 100 with a speed reducer includes a cooling channel 106 inside a housing 104 of an electric motor 101, and also includes a speed reducer accommodating space 125 and a gas storing chamber 130 on the outer surface thereof. The cooling channel 106 is formed as a pipe line that allows cooling water to flow through a tubular body 105 constituting the housing 104. The speed reducer accommodating space 125 accommodates a speed reducer 120 that reduces the rotational speed of the electric motor 101 and is formed adjacent to the gas storing chamber 130. The gas storing chamber 130 stores air to be cooled by the cooling channel 106 and is formed adjacent to the cooling channel 106.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric motor unit with a reducer in which a reducer is integrally assembled to an electric motor. [Background technology]

[0002] Conventionally, there has been known an electric motor unit with a reducer in which a reducer is integrally assembled to an electric motor. For example, Patent Document 1 listed below discloses a power transmission device as an electric motor unit with a reducer having a cooling structure that cools the motor and the reducer by circulating oil scooped up into a catch tank by the motor within the motor and the reducer, respectively. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-205685

[0004] However, the power transmission device described in Patent Document 1 has a problem in that the installation position of the power transmission device is naturally limited because it is configured to be cooled using oil scooped up into the catch tank. That is, the power transmission device described in Patent Document 1 can only be installed in a position where the catch tank opens upward, which limits the degree of freedom in designing a self-propelled vehicle equipped with the power transmission device.

[0005] The present invention has been made to address the above-mentioned problems, and its purpose is to provide an electric motor unit with a reducer that can be installed in any position, thereby increasing the degree of freedom in the design of self-propelled vehicles. Summary of the Invention

[0006] In order to achieve the above object, the present invention is characterized by comprising an electric motor, a cooling flow path formed in a housing of the electric motor and through which a cooling fluid for cooling the internal space of the electric motor flows, a reducer provided in a reducer accommodating space in which the outside of the electric motor is partially covered with a first case and which changes the rotation speed of the electric motor and outputs the speed, and a gas accommodating chamber in which the outside of the electric motor is partially covered with a second case and which accommodates gas, a first heat exchange unit is formed adjacent to the cooling flow path and facing the cooling flow path; and a flow path approaching portion formed adjacent to the cooling flow path via the housing, and extending inside the housing toward the cooling flow path and formed close to the cooling flow path; the flow path approaching portion is formed at each end of the first heat exchange portion in a direction perpendicular to the axial direction of the motor, The reducer accommodating space is formed adjacent to the gas accommodating chamber.

[0007] According to the features of the present invention configured in this manner, the electric motor unit with a reducer can suppress a temperature rise in the reducer accommodation space via the gas in the gas accommodation space by providing gas accommodation chambers adjacent to both the cooling flow path that cools the electric motor and the reducer accommodation space that accommodates the reducer. In other words, the electric motor unit with a reducer according to the present invention suppresses a temperature rise in the electric motor and the reducer accommodation space via the fluid in the cooling flow path and the gas in the gas accommodation chamber, so that the electric motor unit with a reducer can be installed in any orientation, thereby increasing the degree of freedom in the design of the self-propelled vehicle.

[0008] Also, This is how it was configured Features of the present invention According to the present invention, the electric motor unit with a reducer has a flow path approach portion in which the gas storage chamber extends inside the housing toward the cooling flow path, thereby efficiently suppressing the temperature rise of the gas within the gas storage chamber.

[0010] Another feature of the present invention is that in the electric motor unit with a speed reducer, the second case is provided so as to be detachable from the housing.

[0011] According to another feature of the present invention configured as described above, in the electric motor unit with a reducer, the second case is detachably attached to the housing. Therefore, when cooling of the reduction gear accommodation space by the gas accommodation chamber is not required, the second case can be removed from the housing, thereby eliminating the need for the gas accommodation chamber. This allows the electric motor unit with a reducer to be installed in a narrow space or in a free position. Furthermore, in the electric motor unit with a reducer according to the present invention, the second case is detachably attached to the housing, making it easy to perform maintenance on the inside of the gas accommodation chamber.

[0012] Another feature of the present invention resides in that, in the motor unit with a speed reducer, the gas accommodating chamber accommodates parts or devices used in the operation of the motor unit with a speed reducer.

[0013] According to another feature of the present invention configured as described above, the gas accommodating chamber of the reducer-equipped motor unit accommodates various items, such as other components or devices used in the operation of the reducer-equipped motor unit, thereby making effective use of the internal space of the gas accommodating chamber and suppressing temperature increases within the gas accommodating chamber by utilizing the accommodated items. Furthermore, the reducer-equipped motor unit can also suppress temperature increases within the heat-generating device by accommodating heat-generating devices that generate heat during operation within the gas accommodating chamber. Examples of items accommodated in the gas accommodating chamber include maintenance parts, fans, or heat sinks for the reducer-equipped motor unit, as well as heat-generating devices such as a control board or inverter board that controls the operation of the motor.

[0014] Another feature of the present invention is that in the electric motor unit with a speed reducer, the gas accommodating chamber is provided with a vent portion that communicates with the outside air.

[0015] According to another feature of the present invention configured in this manner, the electric motor unit with a reducer has a ventilation section in which the gas storage chamber communicates with the outside air, so that damage to the gas storage chamber can be suppressed by keeping the pressure constant in response to changes in the volume of the gas caused by an increase or decrease in temperature within the gas storage chamber, and the burden of ensuring the rigidity of the gas storage chamber can be reduced, thereby simplifying the configuration. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing an outline of the overall configuration of a reduction gear-equipped electric motor unit according to the present invention; [Figure 2] 2 is a longitudinal sectional view showing an outline of the internal configuration of the reduction gear-equipped electric motor unit shown in FIG. 1. [Figure 3] 3 is a cross-sectional view showing an outline of the internal configuration of the reduction gear-equipped electric motor unit as seen from line 3-3 shown in FIG. 2. FIG. [Figure 4] 2 is a perspective view from the front in which the first case and the second case are omitted in order to show the configuration of a reduction gear accommodating space and a gas accommodating chamber in the reduction gear-equipped electric motor unit shown in FIG. 1. FIG. [Figure 5] 2 is a perspective view from the rear, in which the second case is omitted in order to show the configuration of the gas accommodating chamber in the electric motor unit with a speed reducer shown in FIG. 1. FIG. [Figure 6] FIG. 10 is a vertical cross-sectional view showing an outline of the internal configuration of a reduction gear-equipped electric motor unit according to a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of a reducer-equipped electric motor unit according to the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view showing an outline of the overall configuration of a reducer-equipped electric motor unit 100 according to the present invention. Fig. 2 is a longitudinal sectional view showing an outline of the internal configuration of the reducer-equipped electric motor unit 100 shown in Fig. 1. Fig. 3 is a transverse sectional view showing an outline of the internal configuration of the reducer-equipped electric motor unit 100 as seen from line 3-3 shown in Fig. 2. This reducer-equipped electric motor unit 100 is a driving source for a self-propelled vehicle such as a two-wheeled, three-wheeled, four-wheeled or caterpillar-type vehicle (including a cart or buggy).

[0018] (Configuration of the reducer-equipped electric motor unit 100) The reducer-equipped electric motor unit 100 includes an electric motor 101. The electric motor 101 is a drive source that generates a rotational driving force for rotating the drive wheels of a self-propelled vehicle. In this embodiment, the electric motor 101 is configured as a synchronous motor that drives a self-propelled two-wheeled vehicle.

[0019] Electric motor 101 is mainly composed of stator 102, rotor 103, and housing 104. Stator 102 is a component for generating a rotating magnetic field using three-phase alternating current, and is formed in a cylindrical shape with windings provided around the outer periphery of an iron core. Stator 102 is fixedly attached inside body 105 that constitutes housing 104.

[0020] The rotor 103 is a component that rotates due to the rotating magnetic field generated by the stator 102, and is configured by attaching a permanent magnet to the outer periphery of a rod-shaped shaft. The rotor 103 is disposed inside the body, penetrating the stator 102. In this case, one end of the rotor 103 is rotatably supported, penetrating the output-side cover 110. In this case, the exposed portion of the rotor 103 that penetrates the output-side cover 110 becomes the output shaft of the electric motor 101. The other end of the rotor 103 is rotatably supported by the rear-side cover 112. Note that the stator 102 and the rotor 103 are not shown in FIG. 3.

[0021] Housing 104 is a component that houses stator 102 and rotor 103, and is primarily composed of a body 105, an output-side cover 110, and a rear-side cover 112. Body 105 is a component that houses the main components of stator 102 and rotor 103, and is made of a non-ferrous metal such as aluminum or a non-magnetic material such as a resin material formed into a cylindrical shape. Body 105 supports stator 102 in a cylindrically formed internal space, and rotor 103, which is rotatably supported by output-side cover 110 and rear-side cover 112, is disposed through body 105. Furthermore, a cooling channel 106 is formed inside the cylindrical portion that forms the internal space of body 105.

[0022] The cooling flow passage 106 is a conduit for liquid-tight and airtight circulation of a cooling fluid for cooling the internal space of the housing 104 and the gas accommodating chamber 130, and is formed to extend in the longitudinal direction and circumferential direction of the cylindrical portion. The cooling flow passage 106 is formed so as to cover the outside of the internal space of the housing 104. In other words, the cooling flow passage 106 is formed approximately evenly throughout the entire cylindrical portion.

[0023] This cooling flow path 106 has tubular inlet portion 106a and outlet portion 106b, which are connected to the outer circumferential surface of body 105, for introducing or discharging the cooling fluid. In this case, inlet portion 106a and outlet portion 106b are connected to a liquid feed pump (not shown) for circulating the cooling fluid within cooling flow path 106. Furthermore, cooling flow path 106 passes through body 105 in the axial direction, and faces the wall surfaces of output-side cover 110 and rear-side cover 112. Note that cooling flow path 106 can also be formed so as not to pass through body 105 in the axial direction.

[0024] The cooling fluid is a substance for heat exchange between the internal space of the housing 104 and the gas accommodating chamber 130 via the cylindrical portion, and is composed of a liquid. In this case, the cooling fluid can be composed of a fluid such as water or oil. In this embodiment, the cooling fluid is composed of water.

[0025] 4 and 5, a first heat exchanger 107 is formed on a portion of the outer surface of the body 105. The first heat exchanger 107 forms a portion of the gas accommodating chamber 130 and exchanges heat between the cooling flow path 106 and the gas accommodating chamber 130. The first heat exchanger 107 is formed adjacent to the cooling flow path 106 and faces the cooling flow path 106. In this embodiment, the first heat exchanger 107 is formed with a flat surface that is rectangular in a plan view and extends in the axial direction of the body 105. In this case, the first heat exchanger 107 is formed so that its central portion in the width direction perpendicular to the axial direction of the body 105 is the thinnest in thickness so that it is closest to the cooling flow path 106. The first heat exchanger 107 has flow path proximity portions 108a and 108b formed at both ends in the width direction perpendicular to the axial direction of the body 105.

[0026] The flow path approaching portions 108a, 108b are portions for efficient heat exchange with the cooling flow path 106, and are formed as bottomed grooves extending from the first heat exchange portion 107 toward the cooling flow path 106. In this case, the bottoms of the flow path approaching portions 108a, 108b can be formed as flat surfaces, but in this embodiment they are formed as pointed shapes with gradually narrowing groove widths that extend adjacently along the cooling flow path 106.

[0027] The output-side cover 110 is a component attached to one end of the cylindrically-shaped body 105. It is formed by forming a plate-like body with an upstanding peripheral edge out of a non-ferrous metal such as aluminum or a non-magnetic material such as a resin material. The output-side cover 110 closes one end of the cylindrically-shaped body 105 and rotatably supports one end of the rotor 103. In this case, the output-side cover 110 also closes the cooling flow path 106. The output-side cover 110 also rotatably supports one end of the output shaft 123 of the reducer 120. The output-side cover 110 also has a plate-shaped second heat exchanger 111 that faces the gas storage chamber 130 and forms part of the gas storage chamber 130. The output-side cover 110 is attached to the body 105 with bolts (not shown).

[0028] Rear lid 112 is a component attached to the other end of cylindrically shaped body 105, and is made of a plate-shaped non-ferrous metal such as aluminum or a non-magnetic material such as a resin material. Rear lid 112 closes the other end of cylindrically shaped body 105 and rotatably supports the other end of rotor 103. In this case, rear lid 112 also closes cooling flow path 106. Rear lid 112 is attached to body 105 with bolts (not shown). The outer surface of rear lid 112 is covered with rear cover 113 via a space, and a detection device (not shown) that detects the rotation angle of rotor 103 is provided within this space.

[0029] The reducer 120 is a mechanical device that reduces the rotational speed of the electric motor 101 and outputs the reduced rotational speed, and is mainly composed of a first gear 121, a second gear 122, and a first case 124. The first gear 121 is a component that meshes with the second gear 122 to reduce the rotational speed of the rotor 103 of the electric motor 101, in other words, to increase the torque of the rotor 103, and is composed of a spur gear that rotates integrally with the rotor 103. In this case, the first gear 121 is formed to have a smaller outer diameter and fewer teeth than the second gear 122.

[0030] The second gear 122 is a component that meshes with the first gear 121 to reduce the rotational speed of the rotor 103 of the electric motor 101, in other words, to increase the torque of the rotor 103, and is configured as a spur gear that rotates integrally with an output shaft 123 that extends in a round bar. In this case, the second gear 122 is formed to have a larger outer diameter and a larger number of teeth than the first gear 121. The output shaft 123 is an axial portion that outputs a rotational driving force, and has a spline (not shown) formed at its tip for connection to an output destination.

[0031] The first case 124, together with the output-side cover 110, is a component for forming a reducer housing space 125 that houses the first gear 121 and the second gear 122, respectively, and is configured by forming a plate-like body with an upstanding peripheral edge out of a non-ferrous metal such as aluminum or a non-magnetic material such as a resin material. The first case 124 is attached to the output-side cover 110 via bolts while covering the first gear 121 and the second gear 122, respectively, thereby forming the reducer housing space 125 in the internal space. In other words, the first case 124 forms the reducer housing space 125 by partially covering the outer surface of the electric motor 101. In this case, the first case 124 supports the output shaft 123 so that it can rotate freely while passing through it.

[0032] The reducer accommodating space 125 is a space that accommodates the first gear 121 and the second gear 122. In this case, the reducer accommodating space 125 is formed so that at least a part of it is adjacent to the gas accommodating chamber .

[0033] The gas accommodating chamber 130 is a portion that accommodates gas that is cooled by the cooling fluid in the cooling flow path 106, and is formed adjacent to the cooling flow path 106. The gas accommodating chamber 130 also serves to suppress a temperature rise in the reducer accommodating space 125, and is formed adjacent to the reducer accommodating space 125. The gas accommodating chamber 130 is formed by covering the first heat exchanger 107 and the second heat exchanger 111 with the second case 131, respectively. The gas accommodating chamber 130 is also formed by integrally connecting the flow path approaching portions 108a and 108b.

[0034] Here, the gas accommodated in the gas accommodating chamber 130 is a gas that can exchange heat with the cooling fluid and the air in the reducer accommodating space 125, and is composed of a gas such as air or an inert gas (nitrogen, helium, argon, etc.). In this embodiment, the gas accommodated in the gas accommodating chamber 130 is composed of air. In this case, the humidity of the air is adjusted to 50% or less, preferably 20% or less.

[0035] The second case 131 is a component for forming the gas accommodating chamber 130, and is configured by forming a metal plate, such as an iron-based metal such as carbon steel or a non-ferrous metal such as aluminum, into a semicircular dome shape extending in the axial direction of the body 105. The second case 131 is detachably attached to the first heat exchanger 107 via bolts. This allows the gas accommodating chamber 130 to be formed airtight. That is, the second case 131 forms the gas accommodating chamber 130 by partially covering the outer surface of the electric motor 101.

[0036] (Operation of the reducer-equipped electric motor unit 100) Next, the operation of the thus configured electric motor unit 100 with a speed reducer will be described. This electric motor unit 100 with a speed reducer is mounted inside a self-propelled vehicle as a drive source for driving the drive wheels of the self-propelled vehicle. In this case, the electric motor unit 100 with a speed reducer can be arranged inside the self-propelled vehicle so that the gas accommodating chamber 130 is located above, below, or to the side of the electric motor 101 and / or the reducer accommodating space 125. The operation of this electric motor unit with a speed reducer 100 is controlled by a control device that comprehensively controls the operation of the self-propelled vehicle.

[0037] Here, the control device is configured with a microcomputer including a CPU, ROM, RAM, etc., and also includes a power control unit (PCU) including an inverter, a boost converter, and a DC-DC converter for directly controlling the operation of the electric motor 101. The control device also controls the operation of a water pump that circulates a cooling fluid within the electric motor 101.

[0038] The control device drives the electric motor 101 in response to a start-up operation by the driver of the self-propelled vehicle. In this case, the control device starts the liquid feed pump to cause a cooling fluid to flow through the cooling flow path 106 of the electric motor 101. As a result, the air inside the housing 104 of the electric motor 101 is cooled, and a temperature rise inside the housing 104 is suppressed. Furthermore, since the gas storage chamber 130 is adjacent to the cooling flow path 106 via the first heat exchanger 107, the air inside the gas storage chamber 130 is cooled, and a temperature rise is suppressed.

[0039] Meanwhile, in the reducer accommodating space 125, the reducer 120 generates heat due to its operation. In this case, the reducer accommodating space 125 is adjacent to the gas accommodating chamber 130, in which a temperature rise is suppressed, via the second heat exchanger 111, and therefore a temperature rise is suppressed. Furthermore, even if the temperature of the reducer accommodating space 125 rises, the increased temperature can be quickly reduced because it is adjacent to the gas accommodating chamber 130.

[0040] As can be understood from the above description of operation, according to the above embodiment, the reducer-equipped electric motor unit 100 is able to suppress a temperature rise in the reducer accommodating space 125 via the gas in the gas accommodating chamber 130 by providing the gas accommodating chamber 130 adjacent to each of the cooling flow path 106 that cools the electric motor 101 and the reducer accommodating space 125 that accommodates the reducer 120. In other words, the reducer-equipped electric motor unit 100 according to the present invention suppresses a temperature rise in the electric motor 101 and the reducer accommodating space 125 via the fluid in the cooling flow path 106 and the gas in the gas accommodating chamber 130, and therefore the reducer-equipped electric motor unit 100 can be installed in any position, thereby increasing the degree of freedom in the design of the self-propelled vehicle.

[0041] Furthermore, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present invention. In the modifications described below, the same components as those of the speed reducer-equipped electric motor unit 100 in the above-described embodiment are denoted by the same reference numerals, and their description will be omitted.

[0042] For example, in the above embodiment, the reducer-equipped electric motor unit 100 is configured such that the reducer 120 reduces the rotational speed of the electric motor 101. However, the reducer 120 may be any mechanical device that changes the rotational speed of the electric motor 101. Therefore, the reducer 120 may be configured as a transmission that changes the rotational speed of the electric motor 101 by switching between a plurality of gears with different gear ratios, or as a speed-up gear that increases the rotational speed of the electric motor 101. In other words, the reducer in this application includes a transmission and a speed-up gear.

[0043] In the above embodiment, the speed reducer 120 configures a speed reduction mechanism using the first gear 121 and the second gear 122. However, it goes without saying that the speed reducer 120 may configure each speed reduction mechanism using another structure, for example, a structure using planetary gears.

[0044] In the above embodiment, the electric motor 101 is configured as a synchronous motor. However, the electric motor 101 can also be configured as a motor other than a synchronous motor, for example, other AC motors such as an induction motor, or various DC motors.

[0045] Furthermore, in the above embodiment, the speed reducer-equipped motor unit 100 is configured as a hollow space with nothing installed inside the gas accommodating chamber 130. However, the speed reducer-equipped motor unit 100 can have various tangible objects installed inside the gas accommodating chamber 130. In this case, the objects to be installed inside the gas accommodating chamber 130 include other parts or devices used in the operation of the speed reducer-equipped motor unit 100, such as maintenance parts for the speed reducer-equipped motor unit 100, fans, or heat sinks. Furthermore, the objects to be installed include heat-generating devices that generate heat during operation, such as a control board or inverter board that controls the operation of the motor 101.

[0046] According to these, the speed reducer equipped electric motor unit 100 can effectively utilize the internal space of the gas accommodating chamber 130 and can also utilize the stored contents to suppress a temperature rise inside the gas accommodating chamber 130. Furthermore, the speed reducer equipped electric motor unit 100 can also suppress a temperature rise of the heat-generating equipment by storing the heat-generating equipment that generates heat during operation as stored contents inside the gas accommodating chamber 130.

[0047] 6 shows a speed reducer-equipped electric motor unit 100 in which a control board 140 constituting the control device in the above embodiment is housed in a gas accommodating chamber 130. In this case, the control board 140 is supported by four rod-shaped supports 141 (two are shown in FIG. 6) with a gap between them and the first heat exchanger 107. In addition, the control board 140 penetrates the second case 131 and has an interface terminal 142 exposed therefrom for electrically connecting to a controlled object.

[0048] The thus configured electric motor unit 100 with a reducer can effectively utilize the internal space of the gas accommodating chamber 130 and also suppress a temperature rise in the control board 140. Note that a power supply circuit for supplying three-phase AC power to the electric motor 101 can also be disposed in the gas accommodating chamber 130 together with the control board 140.

[0049] In the above embodiment, the first heat exchange section 107 is formed so that its central portion in the width direction perpendicular to the axial direction of the body 105 is the thinnest in thickness so that it is closest to the cooling flow path 106. However, the first heat exchange section 107 may also be formed at equal intervals with respect to the cooling flow path 106 in the width direction perpendicular to the axial direction and / or coaxial direction of the body 105.

[0050] In the above embodiment, the second case 131 of the reducer-equipped motor unit 100 is configured to be detachable from the housing 104. As a result, when cooling of the reducer accommodating space 125 by the gas accommodating chamber 130 is not required, the second case 131 can be removed from the housing 104, thereby eliminating the need for the gas accommodating chamber 130. This allows the reducer-equipped motor unit 100 to be installed in a small space or in a free position. Furthermore, since the second case 131 of the reducer-equipped motor unit 100 is detachable from the housing 104, maintenance inside the gas accommodating chamber 130 can be easily performed. However, the reducer-equipped motor unit 100 can also have the second case 131 fixedly attached to the housing 104. In this case, the second case 131 can be formed integrally with the housing 104.

[0051] In the above embodiment, the gas accommodating chamber 130 is configured to include the flow path approaching portions 108a and 108b. This allows the speed reducer-equipped electric motor unit 100 to efficiently suppress a temperature rise of the gas in the gas accommodating chamber 130. However, the gas accommodating chamber 130 can also be configured without the flow path approaching portions 108a and 108b.

[0052] In the above embodiment, the cooling flow path 106 is formed around the entire circumference of the cylindrical body 105. However, the cooling flow path 106 may be formed at least partially in at least one of the body 105, the output-side cover 110, and the rear-side cover 112 that constitute the housing 104. The cooling flow path 106 does not necessarily need to circulate the cooling fluid, and may be configured as a closed region in which the cooling fluid is simply stored.

[0053] Furthermore, in the above embodiment, the gas accommodating chamber 130 is configured to be airtight. However, the gas accommodating chamber 130 may also be configured to include a ventilation part that communicates with the outside air. In this case, the ventilation part may be configured as a through-hole provided in the second case 131, or as a gap between the second case 131 and the first heat exchanger 107 and / or the second heat exchanger 111. According to this, in the speed reducer-equipped electric motor unit 100, the gas accommodating chamber 130 includes a ventilation part that communicates with the outside air. This makes it possible to keep the pressure constant in accordance with changes in the volume of the gas in the gas accommodating chamber 130 due to an increase or decrease in the temperature inside the gas accommodating chamber 130, thereby preventing damage to the gas accommodating chamber 130 and simplifying the configuration by reducing the burden of ensuring the rigidity of the gas accommodating chamber 130. [Explanation of symbols]

[0054] 100... motor unit with reducer, 101... motor, 102... stator, 103... rotor, 104... housing, 105... body, 106... cooling flow path, 106a... inlet portion, 106b... outlet portion, 107... first heat exchange portion, 108a, 108b... flow path approach portion, 110...output side lid body, 111...second heat exchange section, 112...rear side lid body, 113...rear side cover, 120...reduction gear, 121...first gear, 122...second gear, 123...output shaft, 124...first case, 125...reduction gear accommodating space, 130...gas storage chamber, 131...second case, 140...control board, 141...support, 142...interface terminal.

Claims

1. An electric motor, a cooling flow path formed in a housing of the electric motor for circulating a cooling fluid for cooling an internal space of the electric motor; a reducer provided in a reducer accommodating space in which the outside of the electric motor is partially covered with a first case, and configured to change and output a rotation speed of the electric motor; a gas storage chamber that stores gas and that is configured by partially covering the outside of the electric motor with a second case, The gas storage chamber is a first heat exchanger is formed at a position adjacent to the cooling flow path so as to face the cooling flow path, and a flow path approaching portion is formed adjacent to the cooling flow path via the housing, and extends inside the housing toward the cooling flow path and is formed close to the cooling flow path, The flow path approach portion is the first heat exchanger is formed at both ends of the first heat exchanger in a direction perpendicular to the axial direction of the motor, The reducer accommodating space is A motor unit with a reducer, which is formed adjacent to the gas storage chamber.

2. In the motor unit with a reducer described in claim 1, The second case is A motor unit with a reducer, characterized in that it is detachably attached to the housing.

3. In the motor unit with a reducer described in claim 1 or claim 2, The gas storage chamber is a flow path approach portion formed inside the housing and extending toward the cooling flow path;

4. 4. The electric motor unit with a reducer according to claim 1, The gas storage chamber is A motor unit with a reducer, characterized in that it houses parts or devices used in the operation of the motor unit with a reducer.

5. 5. The electric motor unit with a reducer according to claim 1, The gas storage chamber is A motor unit with a reducer, characterized by having a ventilation section communicating with the outside air.

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