Rotating motor systems

Abstract

The present invention provides a rotating motor system. The rotating motor system (10) includes a rotating motor (12) and a housing (14). The rotating motor includes a rotating shaft (40). The housing accommodates the rotating motor. A first bearing (92) and a second bearing (94) are provided between the housing (14) and the rotating shaft (40). Gas supplied from a gas supply source outside the housing circulates with a terminal housing (22) accommodating an electrical terminal portion (156a to 156c) as upstream and the housing (14) as downstream. Furthermore, the first bearing and the second bearing are arranged in a circulation path within the housing. This eliminates concerns about the electrical terminal portion, etc., being contaminated by lubricating oil.

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine system including a rotating electrical machine and a housing accommodating the rotating electrical machine. Background Art

[0002] The rotating electric machine has a rotor and a stator. The rotor includes a rotating shaft having a permanent magnet, and the stator includes an electromagnetic coil. Figure 1 As shown, the rotating shaft is rotatably supported by bearings in a housing that houses the stator. Furthermore, when a rotating electrical machine outputs current generated in the electromagnetic coils as the rotor rotates, it is called a generator. In contrast, when a rotating electrical machine derives power from a rotating shaft that rotates when current is applied to the electromagnetic coils, it is called a motor.

[0003] A connector for electrically connecting an external device is provided on the housing, and the external device exchanges electric power with the rotating motor (see Japanese Patent Publication No. 2016-059133). When current flows through the electromagnetic coil or the terminals in the connector, the electromagnetic coil or the terminals generate heat. Due to this heat, the efficiency of converting electrical energy into thermal energy decreases. Similarly, the efficiency of converting thermal energy into electrical energy decreases. In Japanese Patent Publication No. 2016-174443 and Japanese Patent Publication No. 2016-059133, a cooling structure for avoiding this problem is proposed.

[0004] Furthermore, rotating electrical machines are equipped with rotational parameter detectors and temperature measuring instruments. The rotational parameter detectors detect rotational parameters such as the rotational speed, rotational angle, or number of rotations per unit time of the rotating shaft. The temperature measuring instruments measure the temperature of the stator's electromagnetic coils. Heat builds up in the electromagnetic coils and terminals, affecting the rotational parameter detectors and temperature measuring instruments, potentially leading to inaccurate detection and measurement results. The cooling structures disclosed in Japanese Patent Application Publication Nos. 2016-174443 and 2016-059133 can alleviate this concern. Summary of the Invention

[0005] Oil-lubricated bearings are sometimes used as supports for the rotating shaft in the housing. For example, if the lubricant is supplied as a mist or jet, there is a concern that the oil could leak from the bearing and contaminate rotational parameter detectors or temperature measuring instruments.

[0006] A main object of the present invention is to provide a rotating electrical machine system that can eliminate the concern that a rotation parameter detector, a temperature measuring instrument, and electrical terminals for connecting to external devices are contaminated by lubricating oil.

[0007] Another object of the present invention is to provide a rotating electrical machine system having excellent durability and reliability.

[0008] According to one embodiment of the present invention, a rotating electrical machine system is provided, comprising a rotating electrical machine, a housing, and first and second bearings, wherein the rotating electrical machine comprises a rotor including a rotating shaft and a stator including an electromagnetic coil; the housing accommodates the rotating electrical machine; the first and second bearings rotatably support the rotating shaft in the housing, wherein:

[0009] It has a gas supply source and a terminal housing, wherein

[0010] The gas supply source is disposed outside the housing and is used to supply gas;

[0011] The terminal housing accommodates an electrical terminal portion for transmitting and receiving electric power between the rotating electrical machine and an external device, and is provided on a side wall of the housing.

[0012] The terminal housing and the shell are respectively formed with flow paths, and the gas supplied from the gas supply source flows through the flow paths, with the terminal housing being upstream and the shell being downstream.

[0013] The first bearing and the second bearing are disposed in the flow path within the housing.

[0014] According to the present invention, the terminal housing, which houses the electrical terminals, and the housing, which houses the rotating electrical machine, are provided separately. Consequently, heat and vibration generated by the rotating electrical machine within the housing are less likely to affect the electrical terminals within the terminal housing. In other words, the electrical terminals are protected from damage caused by heat and vibration. Furthermore, the electrical terminals, the rotating electrical machine, and the first and second bearings can be rapidly cooled by air flowing into the housing through the terminal housing.

[0015] For these reasons, the effects of heat on the output control and other aspects of the rotating electrical machine system can be avoided. Consequently, the reliability of the rotating electrical machine system is improved. Furthermore, since the first and second bearings are cooled by the lubricating oil, they are less susceptible to burns. Consequently, the rotating electrical machine system has excellent durability.

[0016] The above-mentioned objects, features, and advantages will be easily understood from the following description of the embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic overall perspective view of a rotating electrical machine system according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic side cross-sectional view also showing the flow path of gas in the rotating electrical machine system.

[0019] Figure 3 yes Figure 2 Enlarged view of the main part.

[0020] Figure 4 is with Figure 3 Enlarged views of the main parts of different parts.

[0021] Figure 5 It means from Figure 2 A schematic side sectional view showing the state with the cap removed.

[0022] Figure 6 It means from Figure 5 A schematic side sectional view showing a state in which a resolver holder holding a resolver stator constituting a rotation parameter detector is removed.

[0023] Figure 7 It means from Figure 6 A schematic side sectional view showing the state with the large nut removed.

[0024] Figure 8 It means from Figure 7 A schematic side sectional view showing the state with the rotary cap removed.

[0025] Figure 9 It means from Figure 8 A schematic side sectional view showing a state where the inner shaft is separated from the outer shaft. DETAILED DESCRIPTION

[0026] Hereinafter, the preferred embodiments will be listed and the rotating electrical machine system of the present invention will be described in detail with reference to the accompanying drawings. Figures 2 to 9 The left, right, bottom, and top directions in the manual are shown. However, these directions are convenient directions for simplifying the description and making it easier to understand. That is, the directions shown in the manual are not necessarily the directions when the rotating electrical machine system is actually used.

[0027] Figure 1 It is a schematic overall perspective view of the rotating electrical machine system 10 according to the present embodiment. Figure 2 1 is a schematic side cross-sectional view of a rotating electrical machine system 10. The rotating electrical machine system 10 includes a rotating electrical machine 12 (for example, a generator) and a housing 14 that houses the rotating electrical machine 12.

[0028] The housing 14 includes a main housing 16, a first sub-housing 18, and a second sub-housing 20. The main housing 16 is generally cylindrical in shape, with both ends open. The first sub-housing 18 is connected to the left end of the main housing 16. The second sub-housing 20 is connected to the right end of the main housing 16. A terminal housing 22 and a measuring instrument housing 24 are integrally provided on the side walls of the main housing 16. Furthermore, a rotary transformer holder 26, which serves as a detector holding member, is connected to the first sub-housing 18. A cap 28 is screwed to the rotary transformer holder 26. These are described below.

[0029] The rotating electrical machine 12 will be described in detail. The rotating electrical machine 12 includes a rotor 30 and a stator 32 surrounding the outer circumference of the rotor 30 .

[0030] The rotor 30 includes a rotating shaft 40. The rotating shaft 40 is formed by inserting an inner shaft 34 into a hollow cylindrical outer shaft 36. Specifically, the outer shaft 36 is a hollow body in a substantially cylindrical shape. Both ends of the outer shaft 36 are open ends. That is, the outer shaft 36 has a left open end 42a (see Figure 3 )、Right opening end 42b (refer to Figure 4 ).

[0031] The inner shaft 34 is longer than the outer shaft 36 and has a cylindrical portion 44 and a left end portion 46a (see Figure 3 ) and the right end portion 46b (refer to Figure 4 The cylindrical portion 44 has the smallest diameter among all parts of the inner shaft 34. The left end portion 46a (see Figure 3 ) is connected to the left of the cylindrical portion 44. The diameter of the left end portion 46a is larger than that of the cylindrical portion 44. In addition, the right end portion 46b (refer to Figure 4 ) is connected to the right of the cylindrical portion 44. The diameter of the right end portion 46b is larger than that of the cylindrical portion 44 and smaller than that of the left end portion 46a.

[0032] A portion of the left end portion 46a protrudes from the left open end 42a of the outer shaft 36. This portion becomes a protruding tip 104 described later. In addition, the right end portion 46b is located slightly inward from the right open end 42b of the outer shaft 36.

[0033] like Figure 3As shown in detail, the left end portion 46a of the inner shaft 34 is provided with a first externally threaded portion 48, a flange portion 50, a stopper portion 52, and a second externally threaded portion 54, in this order from left to right. The outer diameters of the first externally threaded portion 48, the flange portion 50, the stopper portion 52, and the second externally threaded portion 54 increase in this order. The outer diameter of the second externally threaded portion 54 is larger than the inner diameter of the outer shaft 36. Therefore, the right end of the second externally threaded portion 54 is blocked by the edge of the left open end 42a of the outer shaft 36. This prevents the inner shaft 34 from being inserted into the outer shaft 36.

[0034] A resolver rotor 56 is mounted on the flange portion 50. A small nut 58 is screwed onto the first externally threaded portion 48. The right end of the resolver rotor 56 is stopped by the stopper 52. The left end of the resolver rotor 56 is pressed by the small nut 58. This positions and secures the resolver rotor 56 to the flange portion 50. Furthermore, a large nut 60 is screwed onto the second externally threaded portion 54. The skirt of the large nut 60 covers the outer circumferential wall of the left open end 42a of the outer shaft 36. This constrains the left end 46a of the inner shaft 34 to the left open end 42a of the outer shaft 36.

[0035] The first external thread portion 48 and the second external thread portion 54 are so-called reverse threads. Therefore, the small nut 58 and the large nut 60 rotate counterclockwise when screwed together. Furthermore, it is preferable to partially deform the threads of the small nut 58 and the large nut 60. This prevents the small nut 58 and the large nut 60 from loosening.

[0036] like Figure 4 As shown, a bolt receiving hole 62 is formed at the right end portion 46b of the inner shaft 34. The bolt receiving hole 62 extends toward the left end portion 46a. An internal thread portion is engraved on the inner peripheral wall of the bolt receiving hole 62. In addition, a thread portion is also engraved on the outer peripheral wall of the right open end 42b of the outer shaft 36. A cylindrical body 66 is screwed into the thread portion. The cylindrical body 66 constitutes a bolt receiving cap 64 for connecting the right open end 42b and the right end portion 46b together. A disk body 68 is provided at the right end opening of the cylindrical body 66. The disk body 68 and the cylindrical body 66 constitute the bolt receiving cap 64. A through hole 70 is formed on the disk body 68. The small-diameter main body of the fastening bolt 72 passes through the through hole 70.

[0037] The threaded portion formed on the main body of the fastening bolt 72 screws into the internal thread of the bolt receiving hole 62. The large-diameter head of the fastening bolt 72 is blocked by the disc 68. Thus, the right open end 42b of the outer shaft 36 and the right end 46b of the inner shaft 34 are connected to each other via the bolt receiving cap 64 and the fastening bolt 72. Furthermore, the left end 46a of the inner shaft 34 is restrained by the left open end 42a of the outer shaft 36. For the reasons described above, the inner shaft 34 and the outer shaft 36 can rotate integrally. Furthermore, the fastening bolt 72 is also a so-called reverse thread.

[0038] A rotating cap 80 having a drive force transmission shaft 78 is connected to the bolt receiving cap 64. A first outer flange 82 is provided at the right end of the cylindrical body 66. A plurality of screw-in holes 81 are formed in the first outer flange 82. A second outer flange 84 having a diameter substantially the same as that of the first outer flange 82 is provided at the left end of the rotating cap 80. Through holes 85 are formed in the second outer flange 84 in the same number and at the same phase as the screw-in holes 81. The threaded portion of a connecting bolt 86 is threadedly engaged with the screw-in holes 81 after passing through the through holes 85. Thus, the rotating cap 80 is connected to the cylindrical body 66.

[0039] A predetermined component (not shown) serving as a rotating body is mounted on the drive force transmission shaft portion 78. As the inner shaft 34 and outer shaft 36 rotate integrally, the bolt receiving cap 64 and the rotating cap 80 also rotate integrally. As a result, the predetermined component mounted on the drive force transmission shaft portion 78 rotates simultaneously with the rotating shaft 40.

[0040] like Figure 2 As shown, the outer diameter of the outer shaft 36 is set to be maximum at the approximately middle portion in the longitudinal direction. In this large-diameter portion, a plurality of permanent magnets 88 are held by a magnet holder 90. Adjacent permanent magnets 88 are separated from each other by a predetermined interval. Furthermore, adjacent permanent magnets 88 have different polarities toward the outer periphery. As the rotating shaft 40 rotates, each permanent magnet 88 moves along the circumference of an imaginary circle centered at the rotation center of the rotating shaft 40.

[0041] The left end (first end) of the rotating shaft 40 is rotatably supported by the first auxiliary housing 18 via the first bearing 92. In addition, the right end (second end) of the rotating shaft 40 is rotatably supported by the second auxiliary housing 20 via the second bearing 94. Figure 2 As shown, in this embodiment, the first bearing 92 is interposed between the outer shaft 36 and the first auxiliary housing 18 , and the second bearing 94 is interposed between the outer shaft 36 and the second auxiliary housing 20 .

[0042] The first auxiliary housing 18 has a cylindrical protrusion 96 that is substantially cylindrical and protrudes toward the main housing 16. A first shaft insertion hole 98 is formed in the cylindrical protrusion 96. The first bearing 92 is disposed in the first shaft insertion hole 98.

[0043] The left opening of the first shaft insertion hole 98 is closed by a circular plate member 102. A second shaft insertion hole 100 is formed in the circular plate member 102. The second shaft insertion hole 100 is connected to the first shaft insertion hole 98. Furthermore, the outer peripheral wall of the left open end 42a of the outer shaft 36 is separated from the inner peripheral wall of the first shaft insertion hole 98. The outer peripheral wall of the left open end 42a of the outer shaft 36 is separated from the inner peripheral wall of the second shaft insertion hole 100. Furthermore, the skirt of the large nut 60 is slightly separated from the left end surface of the circular plate member 102.

[0044] The left end tip of the rotating shaft 40 passes through the inner hole of the first bearing 92. The left end tip passes through the first shaft insertion hole 98 and the second shaft insertion hole 100 and is exposed to the outside of the first auxiliary housing 18. Hereinafter, the portion of the rotating shaft 40 that protrudes from the left end of the first bearing 92 is described as "protruding tip 104". The protruding tip 104 includes the first external thread portion 48, the flange portion 50, the stopper portion 52 and the second external thread portion 54 of the left end portion 46a of the inner shaft 34 (see Figure 3 ).

[0045] The second auxiliary housing 20 is provided with a third shaft insertion hole 106 (see Figure 4 ). The second bearing 94 is disposed in the third shaft insertion hole 106. The right end of the rotating shaft 40 passes through the inner hole of the second bearing 94 and slightly protrudes from the third shaft insertion hole 106. As described above, the rotating cap 80 is disposed on the protruding right end via the bolt receiving cap 64.

[0046] Inserted into the third shaft insertion hole 106 are the first stopper 108a, the second stopper 108b, and the skirt portion of the bearing cap 109. These first stopper 108a, the second stopper 108b, and the bearing cap 109 prevent the second bearing 94 from falling out. The second stopper 108b prevents the first stopper 108a from falling out. Here, the second stopper 108b is surrounded by the left end of the cylindrical body 66 that constitutes the bolt receiving cap 64. Furthermore, the bearing cap 109 is a hollow body formed with a through-hole 110. The cylindrical body 66 is inserted into the through-hole 110. The outer circumferential wall of the cylindrical body 66 is separated from the inner circumferential wall of the through-hole 110.

[0047] like Figure 2 As shown, the first shaft insertion hole 98 and the third shaft insertion hole 106 communicate with a storage chamber 114 (described later), which is the interior space of the main housing 16. Therefore, the first bearing 92 and the second bearing 94 are exposed to the storage chamber 114. The second shaft insertion hole 100 communicates with the storage chamber 114 via the first shaft insertion hole 98.

[0048] In this embodiment, the first bearing 92 and the second bearing 94 are so-called jet-lubricated bearings, lubricated and cooled by lubricating oil supplied in a jet-like stream. Furthermore, the first bearing 92 and the second bearing 94 are not limited to jet-lubricated bearings. They may also be spray-lubricated bearings that spray an oil mist. Furthermore, the first bearing 92 and the second bearing 94 may also be circulating-lubricated bearings. Because the illustrated bearing lubrication methods are well known, detailed illustrations and descriptions are omitted.

[0049] The stator 32, which, together with the rotor 30, constitutes the rotating electrical machine 12, includes an electromagnetic coil 116 and a plurality of insulating substrates 118 around which the electromagnetic coil 116 is wound. The electromagnetic coil 116 includes three types of coils: a U-phase coil, a V-phase coil, and a W-phase coil. In other words, when the rotating electrical machine 12 is a generator, it is a so-called three-phase power supply. Furthermore, the plurality of insulating substrates 118 are arranged in a circular ring shape, thereby forming an inner hole in the stator 32.

[0050] The stator 32 is housed in a housing chamber 114 formed in the main housing 16. A stator holder 120 is interposed between the main housing 16 and the second sub-housing 20. The insulating substrate 118 constituting the stator 32 engages with an annular recess 122 formed in the stator holder 120. This engagement secures the stator 32 in place. The stator holder 120 is preferably an insulator such as a resin material. However, the stator holder 120 may also be a conductor such as a metal material. Furthermore, the cylindrical protrusion 96 enters the inner bore of the stator 32 from the left opening thereof.

[0051] The inner wall of the storage chamber 114 is slightly separated from the electromagnetic coil 116. This separation electrically insulates the main housing 16 from the electromagnetic coil 116.

[0052] Furthermore, a gap is formed between the outer peripheral wall of cylindrical protrusion 96 and insulating substrate 118 by a slight separation between the two. A gap is also formed between the outer wall of permanent magnet 88 and the inner wall of electromagnetic coil 116 by a slight separation between the two. As described below, this gap forms part of the flow path for air, which is a gas.

[0053] The first auxiliary housing 18 has an annular protrusion 124 that protrudes in an annular shape. The inside of the annular protrusion 124 forms a hollow recess 126. The protruding tip 104 constituting the left end 46a of the inner shaft 34 enters the hollow recess 126.

[0054] A resolver holder 26 is provided on the annular protrusion 124 to hold the resolver stator 130. Specifically, the resolver holder 26 includes a flange-shaped stopper 132 that protrudes radially outward. The diameter of the flange-shaped stopper 132 is larger than that of the annular protrusion 124. Therefore, the resolver holder 26 is positioned by the flange-shaped stopper 132 abutting against the annular protrusion 124. In this state, the resolver holder 26 is connected to the first sub-case 18, for example, using mounting bolts (not shown).

[0055] The resolver holder 26 is provided with a small cylindrical portion 134 facing left and a large cylindrical portion 136 facing right, separated by a flange-shaped stopper 132. The diameter of the large cylindrical portion 136 is larger than that of the small cylindrical portion 134. Furthermore, the large cylindrical portion 136 is shorter than the small cylindrical portion 134. A retaining hole 138 is formed in the bottom wall of the small cylindrical portion 134. The right end of the resolver stator 130 engages with this retaining hole 138. This engagement holds the resolver stator 130 in place. When the large cylindrical portion 136 enters the hollow recess 126 and the flange-shaped stopper 132 abuts the annular protrusion 124, the resolver rotor 56 is positioned within the inner bore of the resolver stator 130. The resolver rotor 56 is retained by the flange portion 50 at the left end 46a of the inner shaft 34. Resolver stator 130 and resolver rotor 56 constitute resolver 140 as a rotation parameter detector. In this embodiment, a case where the rotation angle is detected by resolver 140 is exemplified.

[0056] Receiver connector 144 is fitted into fitting hole 142 formed in flange-shaped stopper 132. Resolver stator 130 and receiver connector 144 are electrically connected via signal line 146. Furthermore, a receiver connector of a receiver (not shown) that receives signals emitted by resolver 140 is inserted into receiver connector 144. Receiver connector 144 and the receiver connector electrically connect resolver 140 to the receiver.

[0057] A plurality of protrusions 148 are radially connected to the small cylindrical portion 134. Figure 2 One of them is shown in FIG. Furthermore, the small cylindrical portion 134 is covered with a cap 28 that closes the left opening of the small cylindrical portion 134. The cap 28 covers the left end 46a of the inner shaft 34. The cap 28 is connected to the protrusion 148 by a connecting bolt 150.

[0058] As described above, the terminal housing 22 and the measuring instrument housing 24 are integrally provided on the side wall near the left end of the main housing 16. The measuring instrument housing 24 houses a thermistor 152, which serves as a temperature measuring instrument. Although not specifically shown, the measuring terminals of thermistor 152 extend from the measuring instrument housing 24 and are connected to the electromagnetic coil 116. A wiring harness 154 connected to the thermistor 152 extends from the measuring instrument housing 24 to the outside.

[0059] The terminal housing 22, adjacent to the measuring instrument housing 24, houses a U-phase terminal 156a, a V-phase terminal 156b, and a W-phase terminal 156c. The U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are electrically connected to the ends of the U-phase coil, the V-phase coil, and the W-phase coil, respectively. In other words, the terminal housing 22 is an external device connection connector used to electrically connect an external device to the rotating electrical machine 12. The U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are electrical terminal portions used to supply power to the external device. Furthermore, the interior space of the measuring instrument housing 24 communicates with the interior space of the terminal housing 22 via a connecting hole (not shown).

[0060] like Figure 1 As shown, the outer wall of the main housing 16 is formed with a longitudinal direction ( Figure 2 Hollow tubes 158a to 158c extend in the left-right direction (in the right and left directions). Hollow tube 158a is connected to measuring instrument housing 24. Hollow tubes 158b and 158c are connected to terminal housing 22.

[0061] Hollow tubes 158a-158c are connected to an air pump 160. Air pump 160 supplies air, obtained by drawing in atmospheric air, to hollow tubes 158a-158c. In other words, air pump 160 serves as a gas supply source. Furthermore, hollow tubes 158a-158c form part of the air flow path. Alternatively, air can be supplied to hollow tubes 158a-158c individually. Alternatively, air can be supplied from hollow tube 158a to hollow tube 158c via hollow tube 158b. In this manner, air can also be supplied sequentially to hollow tubes 158a-158c.

[0062] like Figure 2 As shown, the internal space of the terminal housing 22 communicates with the accommodating chamber 114 . Therefore, air flowing into the internal space of the terminal housing 22 can flow through the accommodating chamber 114 and contact the first bearing 92 and the second bearing 94 .

[0063] The rotating electrical machine system 10 according to this embodiment is basically configured as described above. Next, the operation and effects of the rotating electrical machine system 10 will be described. In the following, an example is given in which the rotating electrical machine 12 is a generator.

[0064] The rotating electrical machine system 10 is assembled to, for example, an internal combustion engine. Furthermore, as described above, predetermined components are mounted on the driving force transmission shaft portion 78. The connection terminals of the external device are connected to the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c within the terminal housing 22. When the internal combustion engine is operating, atmospheric air is sucked in by the air pump 160. This atmospheric air is introduced as air into the hollow tube portions 158a to 158c via a transfer tube (not shown). Furthermore, the air pump 160 also supplies air to the internal combustion engine. Thus, the air pump 160 also serves as an air supply source for the internal combustion engine.

[0065] like Figure 1 As shown, the air flowing through hollow tube portion 158a flows into the interior space of measuring instrument housing 24. This forms an air curtain within measuring instrument housing 24. The remaining air flows through the communication holes into the hollow interior (internal space) of terminal housing 22. This remaining air, along with the air that flows through hollow tube portions 158b and 158c and then into the interior space of terminal housing 22, forms an air curtain within terminal housing 22.

[0066] like Figure 2 As shown, the remaining air in the terminal housing 22 flows into the storage chamber 114 formed in the main housing 16. Here, since the terminal housing 22 and the measuring instrument housing 24 are located on the left side of the main housing 16, the air flows in from the left end of the storage chamber 114. Thereafter, the air first enters the inner hole of the stator 32 (the gap between the outer peripheral wall of the cylindrical protrusion 96 and the insulating base material 118).

[0067] Then, a portion of the air flows toward the first shaft through-hole 98. In addition, the remaining portion of the air flows toward the third shaft through-hole 106 along the storage chamber 114 (the gap between the outer wall of the permanent magnet 88 and the inner wall of the electromagnetic coil 116). In this way, the air is branched into air flowing toward the first shaft through-hole 98 at the left end (first end) and air flowing toward the third shaft through-hole 106 at the right end (second end). In addition, as can be understood from the above, the upstream of the air flow path is the internal space of the terminal housing 22 and the measuring instrument housing 24. The downstream of the air flow path is the storage chamber 114 of the main housing 16.

[0068] The air flowing into the first shaft through-hole 98 passes through the first bearing 92 disposed within the first shaft through-hole 98. The air then passes between the outer peripheral wall of the left open end 42a of the outer shaft 36 and the inner peripheral walls of the first shaft through-hole 98 and the second shaft through-hole 100. The air further passes through the gap between the skirt of the large nut 60 and the circular plate member 102, and is then discharged into the atmosphere through the hollow recess 126. On the other hand, the air flowing into the third shaft through-hole 106 passes through the second bearing 94 disposed within the third shaft through-hole 106. The air then passes between the outer peripheral wall of the cylindrical body 66 and the inner peripheral wall of the through-hole 110 of the bearing cover 109. The air is further discharged from the right opening of the through-hole 110 into a lubricating oil tank (not shown) along with the lubricating oil. Alternatively, the air can be discharged through a ventilator.

[0069] When the internal combustion engine is operating, the predetermined component mounted on the rotating shaft 40 rotates. The rotating shaft 40 rotates integrally with the predetermined component. Preferably, the predetermined component and the rotating shaft 40 rotate in the opposite direction to the direction of rotation of the small nut 58, the large nut 60, and the fastening bolt 72 when they are screwed together. This is because loosening of the small nut 58, the large nut 60, and the fastening bolt 72 during the rotation of the rotating shaft 40 can be prevented in this case. Alternatively, a mechanism to prevent loosening can be provided in advance on the small nut 58 or the large nut 60.

[0070] Here, lubricating oil is supplied as a jet stream to the first bearing 92 and the second bearing 94 that rotatably support the rotating shaft 40 in the housing 14. As a result, the first bearing 92 and the second bearing 94 are cooled by the lubricating oil. Therefore, burning of the first bearing 92 and the second bearing 94 can be suppressed. Furthermore, as described above, a flow path is formed in the rotating electrical machine system 10, with the internal spaces of the terminal housing 22 and the measuring instrument housing 24 as the upstream and the first bearing 92 and the second bearing 94 as the downstream. Furthermore, a labyrinth seal structure is provided in the flow path, and air circulates through the labyrinth seal structure. Therefore, lubricating oil is less likely to enter the internal spaces of the terminal housing 22 and the measuring instrument housing 24.

[0071] Furthermore, an air curtain is formed within the interior spaces of terminal housing 22 and measuring instrument housing 24. Therefore, even if lubricating oil enters the interior spaces of terminal housing 22 and measuring instrument housing 24, it is prevented from adhering to U-phase terminal 156a, V-phase terminal 156b, W-phase terminal 156c, thermistor 152, and the like. For these reasons, contamination of the electrical terminals electrically connected to external equipment or the measuring instrument (thermistor 152) with lubricating oil can be effectively prevented.

[0072] Furthermore, in the rotating electrical machine system 10, air passing through the first bearing 92 and the second bearing 94 circulates so as to be exhausted to the outside of the housing 14. Therefore, even if lubricating oil leaks from the first bearing 92 and the second bearing 94, the lubricating oil is exhausted to the outside of the housing 14 along with the air. Consequently, it is possible to prevent the leaked lubricating oil from flowing into the rotor 30. Furthermore, it is possible to prevent the lubricating oil from remaining within the rotor 30.

[0073] As the rotating shaft 40 rotates, the multiple permanent magnets 88 held in the large-diameter portion of the outer shaft 36 rotate in a circular motion. This induces current in the electromagnetic coils 116 (U-phase coil, V-phase coil, and W-phase coil) facing the permanent magnets 88. This current is output as electrical power to drive external devices through the U-phase terminal 156a, V-phase terminal 156b, and W-phase terminal 156c.

[0074] The electromagnetic coil 116 generates heat as current flows through it. Here, the air before branching contacts the left end of the stator 32. Furthermore, the air flowing through the storage chamber 114 toward the third-axis through-hole 106 contacts the outer and inner walls of the stator 32 along its length. In other words, a sufficient amount of air contacts the left end of the stator 32, and the air after branching contacts the entire outer and inner walls of the stator 32. Therefore, the stator 32, including the electromagnetic coil 116, can be rapidly cooled by the air.

[0075] In addition, in this embodiment, a housing 14 (main housing 16) for housing the rotating electrical machine 12 and a terminal housing 22 for housing the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are separately provided. Therefore, the heat generated by the stator 32 in the main housing 16 is unlikely to affect the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c in the terminal housing 22. In addition, since the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c are connected to the terminals of the external device, they will also generate heat. However, the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c can be quickly cooled by the air supplied to the terminal housing 22.

[0076] In this way, the air also cools the heat-generating parts of the rotating electrical machine system 10. Furthermore, since the electrical terminals (U-phase terminal 156a, V-phase terminal 156b, and W-phase terminal 156c) and the electromagnetic coil 116 are cooled, the effects of heat on the output control of the rotating electrical machine system 10 can be prevented. Consequently, the reliability of the rotating electrical machine system 10 is improved.

[0077] Furthermore, the main housing 16 that houses the rotating electrical machine 12 and the terminal housing 22 that houses the U-phase terminal 156a, V-phase terminal 156b, and W-phase terminal 156c are separately provided. Therefore, the rotating electrical machine 12 and the electrical terminal unit are separated from each other. Consequently, the U-phase terminal 156a, V-phase terminal 156b, and W-phase terminal 156c are less susceptible to vibrations generated by the rotation of the rotor 30. In other words, the U-phase terminal 156a, V-phase terminal 156b, and W-phase terminal 156c are protected from vibration damage. Furthermore, as described above, the air can suppress burns on the first bearing 92 and the second bearing 94. Consequently, the rotating electrical machine system 10 has excellent durability.

[0078] During the rotation of the rotating shaft 40, the rotation angle (rotation parameter) of the rotating shaft 40 is detected by the rotary transformer 140. Specifically, the rotary transformer rotor 56, which is embedded in the left end portion 46a of the inner shaft 34, rotates integrally with the rotating shaft 40. Based on this, the rotary transformer stator 130 generates an electrical signal. The electrical signal is transmitted to a receiver electrically connected to the receiver connector 144. The receiver that reads the electrical signal calculates the rotation angle of the rotating shaft 40 based on the electrical signal and sends the result to a control device, etc. (not shown). The control device, etc. calculates the number of rotations per unit time based on the rotation angle through calculation.

[0079] The resolver 140 is mounted on the protruding tip 104 of the rotating shaft 40, which is exposed from the housing 14. Therefore, heat generated by the electromagnetic coil 116 of the stator 32 within the housing 14 is less likely to affect the resolver 140. Furthermore, vibrations generated by the rotation of the rotor 30 are less likely to affect the resolver 140. Furthermore, the first and second bearings 92, 94 supporting the rotating shaft 40 are mounted within the housing 14. Therefore, vibrations of the first and second bearings 92, 94 are suppressed by the housing 14. This also reduces the impact of vibrations on the resolver 140.

[0080] As described above, it is possible to suppress the transmission of heat, vibration, etc. to resolver 140. Therefore, the detection result of the rotation angle of resolver 140 is accurate. In addition, the life of resolver 140 is also prolonged.

[0081] When maintenance is required on the rotary transformer 140 or the rotary electric machine 12 after the rotary electric machine system 10 has been used for a long time, the rotary shaft 40 is removed from the housing 14 as follows. Figure 5 As shown, loosen the connecting bolts 150 to remove the cap 28 from the rotary transformer holder 26. Next, loosen the mounting bolts. As a result, the rotary transformer holder 26 is released from the constraint of the first sub-case 18. Figure 6As shown, the resolver holder 26 can be detached from the first auxiliary housing 18. By this detachment, the small nut 58 and the resolver rotor 56 are exposed.

[0082] When the resolver 140 needs to be replaced, the small nut 58 is loosened in this state to remove the resolver stator 130 from the resolver holder 26 or the resolver rotor 56 from the inner shaft 34. Thus, in this embodiment, the resolver 140 can be easily maintained. This is because the resolver 140 is mounted on the protruding tip 104 of the rotating shaft 40, which is exposed from the main housing 16 beyond the first bearing 92.

[0083] In the case where the inner shaft 34 needs to be pulled out from the outer shaft 36, Figure 7 As shown, loosen the large nut 60 to separate it from the left end portion 46a of the inner shaft 34. As a result, the left end portion 46a of the inner shaft 34 is released from the constraint of the left open end 42a of the outer shaft 36. On the other hand, loosen the connecting bolt 86, as shown in FIG. Figure 8 As shown, the rotating cap 80 is separated from the cylindrical body 66. Then, the fastening bolt 72 is loosened to separate the fastening bolt 72 and the disc body 68 from the cylindrical body 66. According to this, the connection between the right open end 42b of the outer shaft 36 and the right end 46b of the inner shaft 34 is released. Alternatively, Figure 8 The work shown, then, proceed in sequence Figures 5 to 7 The job shown.

[0084] As a result of the above operation, the inner shaft 34 is released from the constraint of the outer shaft 36. Therefore, by pulling out the left end portion 46a of the inner shaft 34 exposed from the left open end 42a of the outer shaft 36, as shown in FIG. Figure 9 As shown, the inner shaft 34 is withdrawn from the outer shaft 36 .

[0085] For example, when replacing resolver 140 with a resolver having larger inner and outer diameters, inner shaft 34 is replaced with an inner shaft having a larger diameter at left end 46a. Furthermore, when using a single solid rotating shaft as rotary shaft 40, replacing the solid rotating shaft with a larger diameter is necessary to accommodate replacing resolver 140 with a resolver having larger inner and outer diameters. In this case, it may be difficult to pass the solid rotating shaft through first bearing 92 or second bearing 94. As can be understood from this, it is preferable to configure rotary shaft 40 to consist of outer shaft 36 and inner shaft 34, with outer shaft 36 passing through first bearing 92 and second bearing 94, and resolver rotor 56 disposed on the portion of inner shaft 34 that protrudes from outer shaft 36. In this case, by replacing inner shaft 34, resolvers 140 having various inner and outer diameters can be accommodated.

[0086] In addition, the present invention is not limited to the above-mentioned embodiment, and various structures can be adopted within the scope not departing from the gist of the present invention.

[0087] For example, it is not particularly necessary to assemble the rotating electrical machine system 10 into an internal combustion engine.

[0088] This embodiment illustrates the case where uncompressed air is supplied to the rotating electrical machine 12. However, compressed air may also be supplied to the rotating electrical machine 12. Furthermore, instead of supplying air from an air pump, air from an internal combustion engine or compressed air may be supplied. Furthermore, the gas is not particularly limited to air. The gas may also be an inert gas such as nitrogen.

[0089] In this embodiment, the resolver 140 is used as the rotation parameter detector, but a detector including a Hall element may also be used.

[0090] Alternatively, the gas may be caused to flow into the interior space of the measuring instrument housing 24 and then into the interior space of the terminal housing 22. Alternatively, gas may be supplied to the measuring instrument housing 24 and the terminal housing 22 separately, and then the gas flowing through the interior spaces of the respective housings 22 and 24 may be caused to flow into the storage chamber 114 separately.

[0091] The rotating electrical machine 12 constituting the rotating electrical machine system 10 may also be an electric motor that rotates the rotating shaft 40 by energizing the electromagnetic coil 116. In this case, the U-phase terminal 156a, the V-phase terminal 156b, and the W-phase terminal 156c serve as electrical terminals for receiving electrical power from external equipment. Preferred examples of the predetermined component attached to the driving force transmission shaft 78 include a drive shaft.

Claims

1. A rotating electrical machine system (10), comprising a rotating electrical machine (12), a housing (14), a first bearing (92), and a second bearing (94), wherein: The rotating motor (12) includes a rotor (30) including a rotating shaft (40) and a stator (32) including an electromagnetic coil (116); the housing (14) accommodates the rotating motor; the first bearing (92) and the second bearing (94) rotatably support the rotating shaft in the housing. It is characterized in that It comprises a gas supply source (160), a terminal housing (22), a cylindrical body (66) and a bearing cover (109), wherein: The gas supply source (160) is arranged outside the housing and is used to supply gas; The terminal housing (22) accommodates electrical terminal portions (156a-156c) for transferring electric power between the rotating electrical machine and external equipment, and is provided on a side wall of the housing. The cylindrical body (66) is arranged on the rotating shaft; The bearing cover (109) is provided on the housing to prevent the second bearing from falling off from the housing. The terminal housing and the shell are respectively formed with flow paths, and the gas supplied from the gas supply source flows through the flow paths, with the terminal housing being upstream and the shell being downstream. The first bearing and the second bearing are disposed in the flow path in the housing. The bearing cover has a through hole, and the cylindrical body is inserted into the through hole in a manner such that the outer peripheral wall of the cylindrical body and the inner peripheral wall of the through hole are separated from each other. The gas supplied to the second bearing passes between the outer peripheral wall of the cylindrical body and the inner peripheral wall of the through hole of the bearing cover and is discharged to the outside of the housing.

2. The rotating electrical machine system according to claim 1, wherein: The gas is branched in the housing, a portion of the gas is supplied to the first bearing, and the remaining portion passes between the stator and the rotor and is supplied to the second bearing.

3. The rotating electrical machine system according to claim 2, wherein: The gas is branched after contacting the outer wall of the stator within the housing.

4. The rotating electrical machine system according to claim 1, wherein: The first bearing and the second bearing are bearings lubricated with lubricating oil.

5. The rotating electrical machine system according to claim 1, wherein: The rotating shaft comprises an outer shaft (36) and an inner shaft (34), wherein the outer shaft (36) is in the shape of a hollow cylinder, the inner shaft (34) is longer than the outer shaft and is inserted into the interior of the outer shaft in a pluggable manner, and one end of the inner shaft is exposed from the outer shaft.

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