Wire connection structure and electric motor

Abstract

To suppress an occurrence of failed products, while preventing a connection terminal from becoming wide in a direction orthogonal to its insertion direction by holding a plurality of conductive wires with a single slit.SOLUTION: A pair of coil ends 44a are aligned and inserted into a single slit 204 in an insertion direction (an axial direction of a rotor) to a housing chamber 101 of a flat male terminal 200. Further, without damaging a terminal housing box 100 and the pair of coil ends 44a, determination equations 1, 2, and 3 for surely and electrically connecting the pair of coil ends 44a mutually are all satisfied. Accordingly, it can be suppressed that the flat male terminal 200 becomes wide in a direction orthogonal to its insertion direction. Moreover, regardless of a press balance of the flat male terminal 200, the flat male terminal 200 can be pressed easily and straight in the insertion direction. Further, without a damage of the terminal housing box 100, an occurrence of failed products can be suppressed.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to an electric wire connection structure and an electric motor having a plurality of conductive wires, a connection terminal that electrically connects the plurality of conductive wires to each other, and a terminal housing box having an accommodation chamber that accommodates the connection terminal. [Background technology]

[0002] Patent Document 1 describes an electric motor in which the ends of a plurality of coils (conductive wires) wound around a stator core (stator) are individually and electrically connected to a plurality of terminals (connection terminals) by soldering. The terminals to which the coils are electrically connected are each individually and electrically connected to a control board by soldering.

[0003] Patent Document 2 describes a terminal member for connecting a conductor wire, which is attached by pressing a terminal member (connection terminal) having a slit against a case in which an end of a winding (conductive wire) is set, so that the end of the winding fits into the slit, thereby electrically connecting the winding and the terminal member. Patent Document 2 makes electrical connection by soldering unnecessary. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-073860 A [Patent Document 2] JP 2000-266083 A Summary of the Invention [Problem to be solved by the invention]

[0005] The technology described in Patent Document 2 can eliminate the need for electrical connection by soldering, but one conductive wire is inserted into one slit. Therefore, when electrically connecting two conductive wires to each other using a connection terminal, it is necessary to line up the two conductive wires in a direction intersecting the pressing direction (insertion direction) of the connection terminal and insert these conductive wires into two slits provided in the connection terminal, respectively. Therefore, the pressing portion of the connection terminal becomes wide in the direction intersecting the insertion direction of the connection terminal, making it difficult to press the connection terminal straight in the insertion direction. This may damage the portion (such as the case) into which the connection terminal is inserted, which may result in defective products.

[0006] An object of the present invention is to provide an electric wire connection structure and an electric motor that can hold multiple conductive wires using a single slit, thereby preventing the connection terminal from becoming wide in a direction intersecting its insertion direction, while further reducing the occurrence of defective products. [Means for solving the problem]

[0007] The electric wire connection structure of the present invention includes a plurality of conductive wires, a terminal housing box having a housing chamber through which the plurality of conductive wires pass, and a connection terminal that is inserted into the housing chamber in a direction intersecting the conductive wires and electrically connects the plurality of conductive wires to each other, and the connection terminal is a terminal connection portion; and a wide portion that is wider than the terminal connection portion; a terminal tip portion provided at a tip side in a direction of insertion into the accommodating chamber, and a terminal base end portion provided at a base end side in the direction of insertion, and a single slit whose tip side in the direction of insertion into the accommodating chamber is opened by a conductive wire inlet portion through which the conductive wire can pass and whose side opposite the conductive wire inlet portion is closed by a bottom portion, and the terminal accommodating box includes an accommodating box end face provided on the opening side of the accommodating chamber, an accommodating chamber bottom face provided on the side opposite the opening side of the accommodating chamber, and support protrusions protruding from the accommodating chamber bottom face toward the opening side and supporting a plurality of the conductive wires; an insertion restriction recess into which the wide portion is inserted from an opening side of the accommodation chamber; and is characterized in that all of the following formulas (1) to (3) are satisfied.

[0008] a-(b+c)≧0 … Formula (1) (c+e)-d≧0 … Equation (2) f-(c+g)≧0 … Equation (3) a: the length from the end face of the storage box to the bottom face of the storage chamber in the insertion direction b: The length from the tip end of the terminal to the base end of the terminal in the insertion direction c: The length from the end face of the container box to the base end of the terminal in the insertion direction d: The length from the end face of the container box to the support protrusion in the insertion direction e: The length from the base end of the terminal to the conductive wire inlet in the insertion direction f: The length from the end face of the container box to the conductive wire in the insertion direction g: The length from the base end of the terminal to the bottom in the insertion direction

[0009] The electric motor of the present invention includes a stator wound with a plurality of conductive wires, a rotor rotating relative to the stator, a terminal housing box having a housing chamber through which the plurality of conductive wires pass, and a connection terminal inserted into the housing chamber in a direction intersecting the conductive wires and electrically connecting the plurality of conductive wires to each other, wherein the connection terminal is: a terminal connection portion; and a wide portion that is wider than the terminal connection portion; a terminal tip portion provided at a tip side in a direction of insertion into the accommodating chamber, and a terminal base end portion provided at a base end side in the direction of insertion, and a single slit whose tip side in the direction of insertion into the accommodating chamber is opened by a conductive wire inlet portion through which the conductive wire can pass and whose side opposite the conductive wire inlet portion is closed by a bottom portion, and the terminal accommodating box includes an accommodating box end face provided on the opening side of the accommodating chamber, an accommodating chamber bottom face provided on the side opposite the opening side of the accommodating chamber, and support protrusions protruding from the accommodating chamber bottom face toward the opening side and supporting a plurality of the conductive wires; an insertion restriction recess into which the wide portion is inserted from an opening side of the accommodation chamber; and is characterized in that all of the following formulas (1) to (3) are satisfied.

[0010] a-(b+c)≧0 … Formula (1) (c+e)-d≧0 … Equation (2) f-(c+g)≧0 … Equation (3) a: the length from the end face of the storage box to the bottom face of the storage chamber in the insertion direction b: The length from the tip end of the terminal to the base end of the terminal in the insertion direction c: The length from the end face of the container box to the base end of the terminal in the insertion direction d: The length from the end face of the container box to the support protrusion in the insertion direction e: The length from the base end of the terminal to the conductive wire inlet in the insertion direction f: The length from the end face of the container box to the conductive wire in the insertion direction g: The length from the base end of the terminal to the bottom in the insertion direction Effect of the Invention

[0011] According to the present invention, in the direction of insertion of the connection terminal into the receiving chamber, a plurality of conductive wires can be inserted side by side into a single slit, and the connection terminal can be prevented from becoming wide in a direction intersecting the insertion direction. Therefore, the connection terminal can be easily pressed straight in the insertion direction without worrying about the balance of pressure on the connection terminal. This makes it possible to prevent damage to the portion where the connection terminal is inserted and to prevent the occurrence of defective products.

[0012] In addition, since all of the above formulas (1) to (3) are satisfied, the conductive wires and the connection terminals can be reliably electrically connected to each other without damaging the terminal housing box, which makes it possible to further reduce the occurrence of defective products. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view showing an output rotor side of the electric motor. [Diagram 2] FIG. 2 is a plan view showing the output rotor side of the electric motor. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. 2 is an exploded perspective view showing the cover side of the electric motor. [Diagram 5]FIG. 4 is an exploded perspective view illustrating the structure inside the cover. [Figure 6] FIG. 2 is a perspective view of the stator core as viewed from the flat male terminal side. [Figure 7] FIG. 7 is an enlarged perspective view of a portion B circled by a dashed line in FIG. 6. [Figure 8] FIG. 8 is a perspective view showing a cross section taken along line CC in FIG. [Figure 9] 8. (a) is a cross-sectional view taken along line DD in FIG. 8, and (b) is a cross-sectional view taken along line EE in FIG. [Figure 10] 5(a) and 5(b) are perspective views illustrating a detailed structure of a flat male terminal. [Figure 11] FIG. 4 is a perspective view illustrating a detailed structure of a terminal receiving box. [Figure 12] 11. (a) is a cross-sectional view taken along line FF in FIG. 11, and (b) is a cross-sectional view taken along line GG in FIG. [Figure 13] FIG. 10 is a cross-sectional view illustrating the judgment formula 1 and corresponding to FIG. [Figure 14] FIG. 10 is a cross-sectional view illustrating the judgment formula 2 and corresponding to FIG. [Figure 15] FIG. 10 is a cross-sectional view illustrating the judgment formula 3 and corresponding to FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0015] FIG. 1 is a perspective view showing the output rotor side of the motor, FIG. 2 is a plan view showing the output rotor side of the motor, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, FIG. 4 is an exploded perspective view showing the cover side of the motor, FIG. 5 is an exploded perspective view explaining the structure inside the cover, FIG. 6 is a perspective view of the stator core as seen from the flat male terminal side, FIG. 7 is an enlarged perspective view of the dashed circle B part in FIG. 6, FIG. 8 is a perspective view showing a cross-section taken along line CC in FIG. 7, FIG. 9(a) is a cross-sectional view taken along line DD in FIG. 8, and (b) is a cross-sectional view taken along line E in FIG. 8. FIG. 10(a) and (b) are oblique views explaining the detailed structure of the flat male terminal, FIG. 11 is an oblique view explaining the detailed structure of the terminal housing box, FIG. 12(a) is a cross-sectional view taken along line FF in FIG. 11, (b) is a cross-sectional view taken along line GG in FIG. 11, FIG. 13 is a cross-sectional view corresponding to FIG. 9(a) explaining judgment formula 1, FIG. 14 is a cross-sectional view corresponding to FIG. 9(a) explaining judgment formula 2, and FIG. 15 is a cross-sectional view corresponding to FIG. 9(a) explaining judgment formula 3.

[0016] 1 is a relatively high-output motor device that drives the wheels (not shown) of an electric transport vehicle that transports harvested agricultural products, etc. By operating an operation switch or the like (not shown), a driving current is supplied to the electric motor 10 from a battery or the like, and the electric motor 10 is thereby driven to rotate in the forward or reverse direction at a predetermined rotation speed.

[0017] 1 to 3, electric motor 10 is formed in a generally disk-like flat shape, which allows for a small and lightweight motor. Electric motor 10 includes a case 20 and a cover 30 that form the outer shell of the motor, and case 20 and cover 30 are butted against each other and fixed by a total of five fixing screws SC1.

[0018] 3, a motor housing chamber MS is formed inside the case 20 and the cover 30, and a flat motor 40, which is a brushless motor, is housed inside the motor housing chamber MS. Also, a sensor board 50 is housed inside the motor housing chamber MS, on which three Hall sensors (magnetic sensors) HS (see FIG. 5) that detect the rotation state of the flat motor 40 (rotor 42) are provided.

[0019] 3, the case 20 is formed into a stepped, roughly bowl-like shape by casting an aluminum material or the like, and includes a large diameter cylindrical portion 21 and a small diameter cylindrical portion 22. The large diameter cylindrical portion 21 is disposed on the cover 30 side (lower side in the figure) in the axial direction of the case 20, and the small diameter cylindrical portion 22 is disposed on the opposite side to the cover 30 side (upper side in the figure) in the axial direction of the case 20.

[0020] A partition wall 23 formed in a substantially disk shape is integrally provided between the large diameter cylindrical portion 21 and the small diameter cylindrical portion 22 in the axial direction of the case 20. The partition wall 23, together with the large diameter cylindrical portion 21, forms a motor accommodating chamber MS. The partition wall 23, together with the small diameter cylindrical portion 22, forms a reducer accommodating chamber RS. In other words, the partition wall 23 separates the motor accommodating chamber MS from the reducer accommodating chamber RS.

[0021] A through hole 23a through which the rotor shaft 45 passes is provided in the center of the partition wall 23. A first ball bearing B1 that rotatably supports a shaft body 45a of the rotor shaft 45 is mounted on the radially inner side of the through hole 23a.

[0022] The flat motor 40 housed inside the motor housing MS has a thickness smaller than its diameter, giving it a flat shape. The flat motor 40 is an inner rotor type brushless motor, and includes an annular stator core (stator) 41 made by laminating a plurality of steel plates, and a rotor 42 rotatably provided radially inside the stator core 41 via a predetermined air gap. The stator core 41 is fixed to the partition wall 23 by a total of three fixing screws SC2 (see FIG. 4), which allows the rotor 42 to rotate relative to the stator core 41.

[0023] An insulator 43 made of an insulating material such as plastic is attached to the stator core 41. The insulator 43 covers substantially the entire stator core 41 including the multiple teeth TH (see FIG. 6 ), and multiple coils (conductive wires) 44 are wound in concentrated winding around the portions of the insulator 43 that correspond to the teeth TH. That is, the coils 44 are wound around each of the teeth TH of the stator core 41 via the insulator 43.

[0024] The rotor 42 includes a main body 42a formed into a roughly bowl shape by pressing a steel plate or the like. A cylindrical permanent magnet 42b is fixed to the radially outer side of the main body 42a. The permanent magnet 42b is magnetized so that N poles and S poles appear alternately in the circumferential direction of the rotor 42. A shaft main body 45a of a rotor shaft 45 is fixed to the center of rotation on the radially inner side of the main body 42a, and the rotor shaft 45 rotates as the rotor 42 rotates.

[0025] The rotor shaft 45 includes a shaft body 45a, a first shaft portion 45b, and a second shaft portion 45c, and the axis of the first shaft portion 45b is provided at a position offset (eccentric) by a predetermined amount from the axis of the shaft body 45a. In contrast, the axis of the second shaft portion 45c coincides with the axis of the shaft body 45a. The shaft body 45a is rotatably supported by the case 20 via a first ball bearing B1, and the rotor 42 is rotatably supported by the case 20 via the rotor shaft 45.

[0026] A hypocycloid reducer 60, which is a reduction mechanism, is accommodated inside the reducer housing RS. The hypocycloid reducer 60 reduces the rotation of the flat motor 40 (rotor shaft 45) and outputs it to the outside. The hypocycloid reducer 60 includes an outer gear 61 and an inner gear 62.

[0027] The outer gear 61 is formed in an annular shape, and is disposed toward the flat motor 40 in the axial direction of the small diameter cylindrical portion 22. The outer gear 61 has a radially outer side fixed to a radially inner side of the small diameter cylindrical portion 22, and a tooth portion 61a consisting of spur teeth is formed on the radially inner side of the outer gear 61.

[0028] The inner gear 62 is provided radially inside the outer gear 61, and the outer diameter dimension thereof is smaller than the inner diameter dimension of the outer gear 61. A first tooth portion 62a consisting of spur teeth is formed on the radially outer side of the inner gear 62, and the first tooth portion 62a of the inner gear 62 meshes with the tooth portion 61a of the outer gear 61. In other words, the inner gear 62 rolls inside the outer gear 61 without slipping.

[0029] The rotation center of the inner gear 62 is rotatably supported by the first shaft portion 45b of the rotor shaft 45 via a pair of second ball bearings B2. As a result, when the first shaft portion 45b rotates radially inside the outer gear 61, the inner gear 62 rotatably supported by the pair of second ball bearings B2 rotates radially inside the outer gear 61 at a slower speed than the rotor shaft 45.

[0030] Further, a second tooth portion 62b consisting of spur teeth is formed radially inside the first tooth portion 62a of the inner gear 62. A tooth portion 63a consisting of spur teeth of the output rotor 63 is meshed with the second tooth portion 62b. Specifically, the tooth portion 63a of the output rotor 63 is disposed radially inside the second tooth portion 62b of the inner gear 62, and the outer diameter dimension is smaller than the inner diameter dimension of the second tooth portion 62b of the inner gear 62. As a result, the output rotor 63 rolls radially inside the second tooth portion 62b of the inner gear 62 without slipping, and rotates at a slower speed than the inner gear 62.

[0031] Here, the output rotor 63 is rotatably supported at its radial inner side by a third ball bearing B3 provided on the second shaft portion 45c, and at its radial outer side by a fourth ball bearing B4 provided on the cover member 64. This allows the output rotor 63, which is subject to a particularly large load, to rotate smoothly for a long period of time. The wheels (not shown) of the electric transport vehicle are fixed to the output rotor 63. Therefore, the rotation of the flat motor 40, which has been reduced in speed by the hypocycloid reducer 60, is transmitted to the wheels of the electric transport vehicle in a high-torque state.

[0032] The cover member 64 closes the reducer housing chamber RS ​​of the case 20, and is fixed to the small diameter cylindrical portion 22 of the case 20 by a total of four fixing screws SC3, as shown in Figs.

[0033] 3, the hypocycloid reducer 60 has a flat shape and is capable of achieving a relatively large reduction ratio (1 / 90). Therefore, by adopting it in the flat-shaped electric motor 10, it is possible to easily accommodate further flattening (thinning) of the electric motor 10. The "reduction ratio (1 / 90)" here means that when the rotor shaft 45, which rotates at high speed, rotates 90 times, the output rotor 63 finally rotates once in a high-torque state.

[0034] As shown in Figures 3 to 5, the cover 30 is formed in a generally bowl shape by injection molding a resin material such as plastic. The cover 30 includes a bottom wall portion 31 formed in a disk shape and a cylindrical side wall portion 32 integrally provided on the outer periphery of the bottom wall portion 31. Three power supply lines 70u, 70v, 70w and one sensor cable 80 (see Figure 5) are inserted into the side wall portion 32 via grommets 33 (see Figure 3) that function as sealing members. This prevents rainwater, dust, and the like from entering the inside of the cover 30.

[0035] Further, a fixing plate 34 (see FIGS. 1 and 3) for preventing the grommet 33 from falling off is provided on the outer side of the side wall portion 32 at the portion of the grommet 33. The fixing plate 34 is fixed to the side wall portion 32 by a pair of fixing screws SC4.

[0036] 5, a line segment CT is defined as a line segment that connects a center portion of the cover 30 in the radial direction of the cover 30 and a center portion of the grommet 33 in the circumferential direction of the side wall portion 32. Also, with the line segment CT as a boundary, one radial side of the cover 30 (upper side in FIG. 5) is defined as a first cover portion C1, and the other radial side of the cover 30 (lower side in FIG. 5) is defined as a second cover portion C2.

[0037] 5, a total of three terminal holders 35a, 35b, and 35c are provided on the inside of the side wall portion 32 and on the side of the first cover portion C1. Each of these terminal holders 35a, 35b, and 35c is formed in a hollow box shape, and a flat female terminal M1 fixed by crimping to the longitudinal base end of the U-phase power supply line 70u, a flat female terminal M2 fixed by crimping to the longitudinal base end of the V-phase power supply line 70v, and a flat female terminal M3 fixed by crimping to the longitudinal base end of the W-phase power supply line 70w are respectively attached therein.

[0038] Furthermore, rod-shaped engaging protrusions 36a, 36b are provided on the inside of the side wall 32 and on the first cover part C1 side and the second cover part C2 side. These engaging protrusions 36a, 36b protrude with a height dimension exceeding the side wall 32 of the cover 30 and have a function of guiding the attachment of the cover 30 to the case 20 (see FIG. 4). Specifically, when the cover 30 is attached to the case 20, these engaging protrusions 36a, 36b are first inserted into engaging recesses (not shown) of the case 20.

[0039] This allows the cover 30 to be accurately positioned relative to the case 20, and the two can be securely attached to each other. By simply attaching the cover 30 to the case 20, the flat male terminals T1, T2, and T3 (see Figures 4 and 6) on the case 20 side are electrically connected with high precision to the flat female terminals M1, M2, and M3, respectively.

[0040] Here, the flat male terminal T1 connected to the flat female terminal M1 (for U phase) is electrically connected to the coil 44 corresponding to the U phase, the flat male terminal T2 connected to the flat female terminal M2 (for V phase) is electrically connected to the coil 44 corresponding to the V phase, and the flat male terminal T3 connected to the flat female terminal M3 (for W phase) is electrically connected to the coil 44 corresponding to the W phase.

[0041] Thus, by supplying drive current to each of the power supply lines 70u, 70v, and 70w at a predetermined timing, current is supplied to the coils 44 (see FIGS. 4 and 6) corresponding to the U phase, V phase, and W phase, respectively, and electromagnetic force is generated in the stator core 41 (see FIGS. 4 and 6). As a result, the rotor 42 (see FIGS. 3 and 4) is driven to rotate in the forward or reverse direction at a predetermined rotation speed.

[0042] 5, the sensor board 50 and a drop-prevention plate 90 are housed inside the cover 30. The drop-prevention plate 90 prevents the power supply lines 70u, 70v, and 70w and the sensor cable 80 attached to the inside of the cover 30 from falling off from the cover 30.

[0043] Three first holding grooves G1 for individually holding the power feed lines 70u, 70v, and 70w are provided on the first cover portion C1 side of the bottom wall portion 31 of the cover 30. This allows the power feed lines 70u, 70v, and 70w to be easily routed inside the cover 30 without interfering with or crossing each other.

[0044] Further, a single second holding groove G2 for holding the sensor cable 80 is provided on the second cover portion C2 side of the bottom wall portion 31 of the cover 30. Here, the sensor cable 80 is thicker than each of the power supply lines 70u, 70v, 70w. Therefore, the width dimension of the second holding groove G2 is larger than the width dimension of the first holding groove G1.

[0045] Furthermore, a relatively large accommodation space SP for accommodating the sensor cable 80 is provided on the second cover portion C2 side of the cover 30 and in the vicinity of the second holding groove G2. This allows the sensor cable 80 to be largely curved with slack inside the cover 30. This allows the sensor cable 80 to be routed between the sensor board 50 and the second holding groove G2 without being forcibly bent.

[0046] In this manner, the U-phase, V-phase, and W-phase power feeders 70u, 70v, and 70w are arranged in the first cover part C1 on one radial side centered on the line segment CT that divides the cover 30, and the sensor cable 80 is arranged in the second cover part C2 on the other radial side. This prevents the power feeders 70u, 70v, and 70w and the sensor cable 80 from contacting or crossing each other inside the cover 30.

[0047] This reliably prevents short circuits between the power feed lines 70u, 70v, and 70w and the sensor cable 80, improving the reliability of the electric motor 10. Furthermore, the power feed lines 70u, 70v, and 70w and the sensor cable 80 can be easily routed to the cover 30, thereby improving the ease of assembly of the electric motor 10.

[0048] Here, the sensor board 50 is fixed to the inside of the cover 30 so as to straddle the line segment CT. Specifically, the sensor board 50 is fixed to the inside of the cover 30 by a pair of fixing screws SC5 (see FIG. 5). Furthermore, the sensor board 50 is a printed circuit board to which a plurality of electronic components including three Hall sensors HS are soldered and which functions as an electronic circuit.

[0049] The three Hall sensors HS provided on the sensor board 50 are aligned at predetermined intervals in the longitudinal direction of the sensor board 50. These Hall sensors HS detect the rotation state (rotation speed, etc.) of the rotor 42, and face the permanent magnets 42b in the axial direction of the rotor 42 (see FIGS. 3 and 4). As a result, the three Hall sensors HS perform switching operations in response to switching between the N pole and S pole of the permanent magnet 42b as the rotor 42 rotates, and each outputs a square wave signal at a predetermined timing.

[0050] A sensor cable 80 is electrically connected to the sensor board 50, and rectangular wave signals from the three Hall sensors HS flow through the sensor cable 80. The connection portion of the sensor cable 80 with the sensor board 50 is fixed by soldering, and has a relatively low rigidity. Therefore, if a large tensile force acts on the sensor cable 80, there is a risk of solder cracks (poor continuity). Therefore, in this embodiment, in order to prevent solder cracks from occurring, the sensor cable 80 is curved significantly in the accommodation space SP with some slack, as shown in FIG. 5.

[0051] 1, 2, 4, and 5, a first connector connection part CN1 to which an external connector for power supply (not shown) is connected is provided at a portion of each of the power supply lines 70u, 70v, and 70w that is drawn out to the outside of the cover 30. Furthermore, a second connector connection part CN2 to which an external connector for control (not shown) is connected is provided at a portion of the sensor cable 80 that is drawn out to the outside of the cover 30.

[0052] In this way, by separating the cables of the power supply system (power supply lines 70u, 70v, 70w) and the cables of the control system (sensor cable 80), electrical noise, etc. radiated from the cables of the power supply system is prevented from adversely affecting the cables of the control system.

[0053] 5, the fall-off prevention plate 90 is formed in a substantially disk shape from a resin material such as plastic. The fall-off prevention plate 90 is provided with a rectangular cutout 93 cut into a substantially rectangular shape, and the sensor board 50 is disposed in the rectangular cutout 93. This eliminates the need to overlap the fall-off prevention plate 90 and the sensor board 50 in the axial direction of the cover 30, thereby preventing an increase in the thickness of the electric motor 10.

[0054] Furthermore, a total of five screw holes 96 are provided in the radially outer portion of the fall-off prevention plate 90 so as to be aligned in the circumferential direction. Fixing screws SC6 (a total of five) are inserted into each of these screw holes 96, so that the fall-off prevention plate 90 is fixed to the inside of the cover 30 without rattling.

[0055] Additionally, a total of three support protrusions 97 are integrally provided lined up in the circumferential direction on the radially outer portion of the fall-off prevention plate 90. These support protrusions 97 are portions that face the terminal holders 35a, 35b, and 35c, respectively, in the radial direction of the cover 30, and support the sides of the flat female terminals M1, M2, and M3 (not shown in detail).

[0056] This prevents the flat female terminals M1, M2, M3 from tilting when the flat male terminals T1, T2, T3 (see Figs. 4 and 6) on the case 20 side are connected to the flat female terminals M1, M2, M3. This allows the flat male terminals T1, T2, T3 to be reliably electrically connected to the flat female terminals M1, M2, M3.

[0057] As shown in Fig. 6, a total of three terminal housing boxes 100a, 100b, and 100c are integrally provided on the insulator 43 attached to the stator core 41. That is, each of these terminal housing boxes 100a, 100b, and 100c is also formed of an insulating material such as plastic. Each of the terminal housing boxes 100a, 100b, and 100c is disposed radially outside the insulator 43 (stator core 41), and faces each of the terminal holders 35a, 35b, and 35c (see Fig. 5) provided on the cover 30 in the axial direction of the electric motor 10 when the electric motor 10 is assembled.

[0058] The three terminal housing boxes 100a, 100b, and 100c are for the U-phase, V-phase, and W-phase, respectively, in that order, and are formed to be the same shape as one another. The detailed structure of the terminal housing box 100a for the U-phase, which is enclosed by the dashed circle B in Fig. 6, will be described below. For ease of explanation, the terminal housing box is referred to as the terminal housing box 100 in Figs. 7 to 15.

[0059] In addition, flat male terminals T1, T2, and T3 for the U-phase, V-phase, and W-phase are inserted into the terminal housing boxes 100a, 100b, and 100c, respectively. These flat male terminals T1, T2, and T3 are also formed to have the same shape. Therefore, the detailed structure of the flat male terminal T1 for the U-phase, which is enclosed by the dashed circle B in Fig. 6, will be described below as a representative. For convenience of explanation, the flat male terminal is referred to as a flat male terminal 200 in Figs. 7 to 15.

[0060] As shown in Figs. 7 to 9, a pair of coil ends 44a (here, a pair of coil ends for the U phase) of the coil 44 wound around the teeth TH (see Fig. 6) are electrically connected to each other by the flat male terminal 200 in the terminal housing box 100. Specifically, by housing (inserting) the flat male terminal 200 in the housing chamber 101 (see Fig. 11) of the terminal housing box 100, the enamel paint (not shown) applied to the surface of each coil end 44a is scraped off by the flat male terminal 200. Thus, the pair of coil ends 44a are electrically connected to each other via the flat male terminal 200. The terminal housing box 100, the flat male terminal 200, and the pair of coils 44 (coil ends 44a) constitute the electric wire connection structure of the present invention.

[0061] First, the structure of the flat male terminal 200 will be described in detail with reference to the drawings. The flat male terminal 200 corresponds to the connection terminal in the present invention. The flat male terminal 200 is a so-called "insulation-displacement terminal" and is formed into a three-dimensional shape as shown in Figs. 7 to 10 by pressing and bending a brass plate or the like having excellent conductivity. Specifically, the flat male terminal 200 includes a flat terminal connection portion 201 that is inserted into the flat female terminal M1 (see Fig. 5), and a terminal main body portion 202 that is inserted into the receiving chamber 101 of the terminal receiving box 100 in a direction intersecting with the pair of coil ends 44a (coil 44).

[0062] The terminal connection part 201 stands upright toward the axial cover 30 side of the electric motor 10 with the flat male terminal 200 fixed in the accommodation chamber 101 of the terminal accommodation box 100. As a result, when the electric motor 10 is assembled, the terminal connection part 201 is inserted into the flat female terminal M1, and the two are electrically connected to each other.

[0063] As shown in FIGS. 10( a ) and 10 ( b ), the terminal main body 202 is formed in a hollow, generally box-like shape, and is inserted into the receiving chamber 101 of the terminal receiving box 100 .

[0064] A terminal tip portion 202a facing the bottom surface 103 (see FIG. 11) of the accommodation chamber 101 is provided on a tip side of the terminal main body portion 202 in the insertion direction into the accommodation chamber 101. A terminal base portion 202b facing the axial cover 30 of the electric motor 10 is provided on a base end side of the terminal main body portion 202 in the insertion direction into the accommodation chamber 101.

[0065] Furthermore, between the terminal connection portion 201 and the terminal body portion 202 of the flat male terminal 200, a wide portion 203 that is wider than the terminal connection portion 201 is provided integrally.

[0066] A single slit 204 is provided in the terminal body 202. As shown in Figures 9(a) and (b), a pair of coil ends 44a are inserted into this slit 204. That is, the slit 204 holds the pair of coil ends 44a (coils 44) side by side so as to overlap each other in the insertion direction of the terminal body 202 into the accommodation chamber 101.

[0067] The slit 204 is open on the terminal tip end 202a side in the insertion direction into the accommodating chamber 101, and is cut out to a predetermined depth toward the terminal base end 202b. A coil inlet 204a through which the pair of coil ends 44a can pass is provided on the opening side of the slit 204 (the lower side in Figs. 9 and 10), and the opposite side of the slit 204 from the coil inlet 204a (the upper side in Figs. 9 and 10) is closed by a slit bottom 204b formed in a substantially arc shape. The coil inlet 204a corresponds to the conductor wire inlet in this invention, and the slit bottom 204b corresponds to the bottom in this invention.

[0068] Here, the opening width between the coil inlet 204a and the slit bottom 204b in the longitudinal direction of the slit 204 is W1 (see Figs. 13 to 15). In contrast, the coil end 44a (coil 44) inserted into the slit 204 has a diameter DA (see Figs. 13 to 15) that is larger than the opening width W1 of the coil inlet 204a (DA>W1). Therefore, the enamel paint applied to the surface of the coil end 44a can be reliably scraped off, and the pair of coil ends 44a are reliably electrically connected to each other via the flat male terminal 200.

[0069] However, it is preferable that the opening width W1 of the slit 204 is approximately half (about 1 / 2) of the diameter DA of the coil end 44a (W1 ≈ DA / 2). This ensures that the enamel paint can be scraped off and that the pair of coil ends 44a can have sufficient pull-out strength against the flat male terminal 200. Furthermore, the pair of coil ends 44a are reliably prevented from being broken by the slit 204.

[0070] Here, since the terminal main body 202 is provided with only one slit 204 extending in the insertion direction of the pair of coil ends 44a, it is possible to suppress an increase in the widthwise dimension (left-right direction in the figure) of the terminal main body 202, as shown in Fig. 9. This means that, as can be seen from Fig. 6, an increase in the radially outward dimension of the insulator 43 attached to the stator core 41 is suppressed, and thus an increase in the radially outward dimension of the electric motor 10 is suppressed.

[0071] In addition, since an increase in the width direction dimension of the terminal body 202 is suppressed, the flat male terminal 200 can be made vertically elongated as shown in Fig. 9. Therefore, the flat male terminal 200 can be easily pressed straight in the insertion direction without worrying about the pressing balance of the terminal body 202. This means that damage to the terminal receiving box 100 is suppressed, and thus the occurrence of defective products is suppressed.

[0072] Furthermore, a guide opening 205 is provided on the terminal tip 202a side of the coil inlet 204a of the slit 204, the opening width of which gradually increases toward the terminal tip 202a side (the lower side of Figs. 9 and 10). The guide opening 205 has a function of guiding (guiding) the pair of coil ends 44a to the coil inlet 204a and the slit 204. Specifically, the opening width W2 (see Figs. 13 to 15) of the guide opening 205 closest to the terminal tip 202a is larger than the diameter DA of the coil end 44a (W2>DA). This allows the pair of coil ends 44a, which are set inside the accommodation chamber 101 and cannot be seen from the outside of the terminal accommodation box 100, to be easily and reliably inserted into the slits 204.

[0073] The terminal body 202 is provided with a plurality of retaining projections 206 for preventing the terminal body 202 accommodated in the accommodation chamber 101 from coming off. Specifically, as shown in Figures 9(a) and (b), the retaining projections 206 are arranged on both sides (left and right sides in the figures) of the terminal body 202, and their cross sections are formed into a substantially triangular shape. The corners on the tip side of these retaining projections 206 protrude toward the accommodation chamber side wall 104 that forms the accommodation chamber 101, and are engaged and hooked on the accommodation chamber side wall 104.

[0074] Next, the structure of the terminal housing box 100 will be described in detail with reference to the drawings. As shown in Figures 11 and 12, the terminal housing box 100 is formed in a substantially rectangular parallelepiped shape. Inside the terminal housing box 100, a housing chamber 101 is formed through which a pair of coil ends 44a (coils 44) pass (see Figure 8) and which houses a terminal main body 202 (see Figure 10) of a flat male terminal 200.

[0075] The terminal accommodating box 100 also includes an accommodating box end surface 102 provided on the opening side of the accommodating chamber 101 (upper side in FIG. 12), and an accommodating chamber bottom surface 103 provided on the opposite side to the opening side of the accommodating chamber 101 (lower side in FIG. 12). An accommodating chamber side wall 104 stands upright from the accommodating chamber bottom surface 103 toward the opening side of the terminal accommodating box 100. In other words, the accommodating chamber 101 is surrounded by the accommodating chamber bottom surface 103 and the accommodating chamber side wall 104.

[0076] Furthermore, inside the terminal accommodating box 100, a pair of insertion restricting recesses 105 into which the wide portion 203 (see FIG. 10) of the flat male terminal 200 is inserted are provided. These insertion restricting recesses 105 form part of the accommodating chamber 101, and their depth from the accommodating box end face 102 is shallower than that of the accommodating chamber 101. Specifically, the depth dimension of the insertion restricting recesses 105 is approximately ¼ the depth dimension of the accommodating chamber 101 (see FIG. 12).

[0077] A first inclined wall portion 106 that guides the insertion of the terminal body portion 202 and the wide portion 203 of the flat male terminal 200 is provided on the opening side of the accommodation chamber 101 and the insertion restricting recess 105. Specifically, as shown in Fig. 11, the first inclined wall portion 106 is provided around the entire periphery of the opening side of the accommodation chamber 101 and the insertion restricting recess 105. This makes it possible to easily insert the flat male terminal 200 into the terminal accommodation box 100.

[0078] Furthermore, a support protrusion 107 that supports a pair of coil ends 44a (see Figs. 8 and 9(a)) is provided in an approximate center portion of the accommodation chamber bottom surface 103 of the terminal accommodation box 100. Specifically, the support protrusion 107 protrudes from the accommodation chamber bottom surface 103 toward the opening side of the accommodation chamber 101, and supports the pair of coil ends 44a in an overlapping state in the protruding direction of the support protrusion 107 (see Figs. 8 and 9(a)). The protruding height of the support protrusion 107 from the accommodation chamber bottom surface 103 is approximately ⅓ the depth dimension of the accommodation chamber 101 (see Fig. 12).

[0079] 9(a), the support protrusions 107 are inserted into the inside of the terminal body 202 when the terminal body 202 is inserted into the receiving chamber 101. As a result, when the flat male terminal 200 is inserted into the terminal receiving box 100, the pair of coil ends 44a supported by the support protrusions 107 are positioned at a specified position between the coil inlet portion 204a and the slit bottom portion 204b of the slit 204.

[0080] 13 to 15, the area (prescribed position) between the coil inlet 204a and the slit bottom 204b of the slit 204 is the effective pressure welding range AR where the pair of coil ends 44a and the terminal main body 202 can be securely electrically connected to each other. That is, in this embodiment, the pair of coil ends 44a can be disposed in the effective pressure welding range AR of the slit 204 simply by inserting the terminal main body 202 into the accommodating chamber 101.

[0081] 11 and 12, the terminal housing 100 is provided with a pair of positioning grooves 108. These positioning grooves 108 are provided in opposing wall portions 109 that face each other in the extending direction of the pair of coil ends 44a, and are recessed from the housing end surface 102 toward the housing chamber bottom surface 103. That is, the pair of positioning grooves 108 extend in the axial direction of the rotor 42 (see FIG. 4). Specifically, the depth dimension of each positioning groove 108 is approximately 2 / 3 of the depth dimension of the housing chamber 101 (see FIG. 12). In other words, the depth dimension of the positioning groove 108 is a depth dimension that reaches the tip portion of the support protrusion 107.

[0082] 9(b), the opening width W3 of each positioning groove 108 is slightly larger than the diameter DA (see FIGS. 13 to 15) of the pair of coil ends 44a (coils 44) (W3>DA). Therefore, the pair of coil ends 44a that enter each positioning groove 108 are overlapped in the insertion direction of the flat male terminal 200 into the terminal receiving box 100. In other words, they are overlapped in the axial direction of the rotor 42 (see FIG. 4).

[0083] 8 and 9(a), the pair of coil ends 44a that enter the pair of positioning grooves 108 are aligned at the tip portions of the support protrusions 107 in the insertion direction of the flat male terminals 200 into the terminal housing box 100, in other words, in the axial direction of the rotor 42. In this manner, the pair of positioning grooves 108 have the function of positioning the pair of coil ends 44a at the correct positions relative to the support protrusions 107.

[0084] In addition, a second inclined wall portion 110 that guides the insertion of the pair of coil ends 44a into the pair of positioning grooves 108 is provided on the opening side of the pair of positioning grooves 108. This makes it possible to easily insert (route) the pair of coil ends 44a into the respective positioning grooves 108.

[0085] The electric wire connection structure of the electric motor 10 according to this embodiment is configured to satisfy all of the criteria 1, 2, and 3 shown in Figures 13, 14, and 15. In other words, the dimensional relationship between the terminal housing box 100, the flat male terminal 200, and the pair of coil ends 44a, and the insertion amount of the flat male terminal 200 into the terminal housing box 100 satisfy all of the criteria 1, 2, and 3.

[0086] The flat male terminal 200 is inserted into the terminal receiving box 100 by an assembly worker (manual) or an automatic assembly device (automatic) using a pressing tool (not shown). Moreover, the judgment formula 1 shown in Fig. 13 corresponds to the formula (1) in the present invention, the judgment formula 2 shown in Fig. 14 corresponds to the formula (2) in the present invention, and the judgment formula 3 shown in Fig. 15 corresponds to the formula (3) in the present invention.

[0087] [Judgment formula 1] As shown in FIG. 13, the judgment formula 1 that the electric wire connection structure of the electric motor 10 satisfies is "a-(b+c)≧0."

[0088] In the insertion direction of the flat male terminal 200 into the receiving chamber 101, a, b, and c in the judgment formula 1 are defined as follows. a: Length from the end surface 102 of the container to the bottom surface 103 of the container chamber b: Length from the terminal tip portion 202a to the terminal base portion 202b c: Length from the container end surface 102 to the terminal base end 202b

[0089] By configuring the terminal housing 1 so as to satisfy the judgment formula 1, when the flat male terminal 200 is inserted into the terminal housing box 100, the terminal tip 202a of the flat male terminal 200 and the housing chamber bottom surface 103 of the terminal housing box 100 do not interfere with each other. In other words, the judgment formula 1 is a judgment formula for preventing the terminal tip 202a and the housing chamber bottom surface 103 from interfering with each other in the insertion direction of the flat male terminal 200 into the housing chamber 101. This makes it possible to reliably prevent the occurrence of defects such as cracks in the terminal housing box 100.

[0090] It should be noted that the stroke amount of the pressing jig may be adjusted so that "c = 0". In other words, the housing box end face 102 and the terminal base end portion 202b may be flush with each other. In this way, the shape of the pressing jig can be simplified while the stroke amount can be easily controlled, and the work process can be simplified. In addition, it is possible to more reliably prevent the occurrence of defects such as cracks in the terminal housing box 100.

[0091] [Judgment formula 2] As shown in FIG. 14, the judgment formula 2 that the electric wire connection structure of the electric motor 10 satisfies is "(c+e)-d≧0."

[0092] Here, in the insertion direction of the flat male terminal 200 into the receiving chamber 101, c, d, and e of the judgment formula 2 are defined as follows. c: Length from the container end surface 102 to the terminal base end 202b d: Length from the end face 102 of the container to the support protrusion 107 e: Length from terminal base end 202b to coil inlet 204a

[0093] By configuring the flat male terminal 200 to satisfy the judgment formula 2, when the flat male terminal 200 is inserted into the terminal housing box 100, the pair of coil ends 44a are disposed closer to the slit 204 side (upper side in the figure) than the coil inlet 204a, and fall within the effective pressure welding range AR (shaded area in the figure). That is, the judgment formula 2 is a judgment formula for reliably inserting the pair of coil ends 44a into the slit 204 in the insertion direction of the flat male terminal 200 into the housing chamber 101, in other words, a judgment formula for reliably electrically connecting the pair of coil ends 44a to each other. This makes it possible to reliably prevent poor continuity of the pair of coil ends 44a.

[0094] Incidentally, in the judgment formula 2 as well, as explained in the judgment formula 1 above, the stroke amount of the pressing jig may be adjusted so that "c=0" holds.

[0095] [Judgment formula 3] As shown in FIG. 15, the judgment formula 3 that the electric wire connection structure of the electric motor 10 satisfies is "f-(c+g)≧0".

[0096] Here, in the insertion direction of the flat male terminal 200 into the receiving chamber 101, f, c, and g in the judgment formula 3 are defined as follows. f: Length from the end surface 102 of the container to the coil end 44a (coil 44) c: Length from the container end surface 102 to the terminal base end 202b g: Length from terminal base end 202b to slit bottom 204b However, "f" can be replaced with "d-(DA×n)," where DA is the diameter of the coil end 44a, and n is the number of the coil ends 44a (n=2 in this embodiment).

[0097] By configuring the terminal 200 to satisfy the formula 3, when the terminal 200 is inserted into the terminal housing box 100, the pair of coil ends 44a are disposed closer to the slit 204 side (lower side in the figure) than the slit bottom 204b, and are within the effective pressure welding range AR (shaded area in the figure). In other words, the formula 3 is a formula for preventing the coil end 44a on the slit bottom 204b side of the pair of coil ends 44a from being damaged or broken by the slit bottom 204b in the insertion direction of the flat male terminal 200 into the housing chamber 101. This makes it possible to reliably prevent poor continuity of the pair of coil ends 44a, as with the formula 2 above.

[0098] Incidentally, in the judgment formula 3 as well, as explained in the judgment formula 1 above, the stroke amount of the pressing jig may be adjusted so that "c=0" holds.

[0099] As described above in detail, according to this embodiment, in the insertion direction (axial direction of the rotor 42) of the flat male terminal 200 into the accommodating chamber 101, a pair of coil ends 44a can be inserted side by side into a single slit 204, and the flat male terminal 200 can be prevented from becoming wide in a direction intersecting the insertion direction. Therefore, the flat male terminal 200 can be easily pressed straight in the insertion direction without worrying about the pressing balance of the flat male terminal 200. Therefore, damage to the portion (terminal receiving box 100) into which the flat male terminal 200 is inserted can be prevented, and the occurrence of defective products can be prevented.

[0100] 13, 14, and 15 are all satisfied, the coil ends 44a and the flat male terminals 200 can be reliably electrically connected to each other without damaging the terminal housing box 100. This makes it possible to further prevent the occurrence of defective products.

[0101] Furthermore, according to this embodiment, the pair of coil ends 44a connected to the flat male terminal 200 are each overlapped in the insertion direction of the flat male terminal 200 into the accommodating chamber 101 (the axial direction of the rotor 42), so that the pair of coil ends 44a can be reliably electrically connected to each other as the flat male terminal 200 is inserted into the terminal accommodating box 100.

[0102] Furthermore, according to this embodiment, the terminal housing box 100 is provided with positioning grooves 108 that extend in the insertion direction of the flat male terminal 200 into the housing chamber 101 (axial direction of the rotor 42) and position the pair of coil ends 44a with respect to the support protrusions 107, so that by simply setting the pair of coil ends 44a into the pair of positioning grooves 108, the pair of coil ends 44a can be aligned at the tip portions of the support protrusions 107 in the insertion direction of the flat male terminal 200 into the terminal housing box 100 (axial direction of the rotor 42). This improves the ease of assembly.

[0103] Furthermore, according to this embodiment, the diameter DA of the coil 44 (coil end 44a) is larger than the opening width W1 of the coil inlet portion 204a (DA>W1), so that the enamel paint applied to the surface of the coil end 44a can be reliably scraped off. Therefore, the pair of coil ends 44a can be reliably electrically connected to each other at the slit 204 of the flat male terminal 200.

[0104] Furthermore, according to this embodiment, the soldering process is eliminated, improving the assembly workability of the electric motor 10, and suppressing the increase in the diameter of the electric motor 10 while suppressing the occurrence of defective products. This makes it possible to extend the product life cycle while saving manufacturing energy. Therefore, it is possible to contribute to the Sustainable Development Goals (SDGs) led by the United Nations, particularly to Goal 7 (Ensure access to affordable, reliable, sustainable and modern energy) and Goal 13 (Take urgent action to combat climate change and its impacts).

[0105] The present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention. In the above embodiment, the electric motor 10 is applied to an electric transport vehicle that transports harvested crops, etc., but the present invention is not limited to this, and can be applied to devices for other purposes, such as a drive source for welfare equipment such as a wheelchair device.

[0106] Additionally, the material, shape, size, number, installation location, etc. of each component in the above-described embodiment may be arbitrary as long as it achieves the present invention, and is not limited to the above-described embodiment. [Explanation of symbols]

[0107] 10: electric motor, 20: case, 21: large diameter cylindrical portion, 22: small diameter cylindrical portion, 23: partition wall, 23a: through hole, 30: cover, 31: bottom wall portion, 32: side wall portion, 33: grommet, 34: fixing plate, 35a to 35c: terminal holder, 36a, 36b: engaging protrusion, 40: flat motor, 41: stator core (stator), 42: rotor, 42a: main body portion, 42b: permanent magnet, 43: insulator, 44: coil (conductive wire, electric wire connection structure), 44a: coil end (electric wire connection structure), 45: rotor shaft, 45a: shaft main body, 45b: First shaft portion, 45c: second shaft portion, 50: sensor board, 60: hypocycloid reducer, 61: outer gear, 61a: teeth portion, 62: inner gear, 62a: first teeth portion, 62b: second teeth portion, 63: output rotor, 63a: teeth portion, 64: cover member, 70u: U-phase power supply line, 70v: V-phase power supply line, 70w: W-phase power supply line, 80: sensor cable, 90: fall prevention plate, 93: rectangular notch portion, 96: screw hole, 97: support protrusion, 100: terminal housing box (electric wire connection structure), 100a to 100c: terminal housing box, 101: housing chamber ,102: end face of the container, 103: bottom face of the container, 104: side wall of the container, 105: insertion restriction recess, 106: first inclined wall, 107: support protrusion, 108: positioning recess, 109: opposing wall, 110: second inclined wall, 200: flat male terminal (connection terminal, electric wire connection structure), 201: terminal connection part, 202: terminal main body, 202a: terminal tip part, 202b: terminal base part, 203: wide part, 204: slit, 204a: coil inlet part (conductive wire inlet part), 204b: slit bottom part (bottom part), 205: guide opening, 206: removal Retaining protrusion, AR: Effective pressure contact area, B1: First ball bearing, B2: Second ball bearing, B3: Third ball bearing, B4: Fourth ball bearing, C1: First cover part, C2: Second cover part, CN1: First connector connection part, CN2: Second connector connection part, G1: First retaining groove, G2: Second retaining groove, HS: Hall sensor, M1-M3: Flat female terminal, MS: Motor housing chamber, RS: Reducer housing chamber, SC1-SC6: Fixing screw, SP: Housing space, T1-T3: Flat male terminal (connecting terminal), TH: Teeth

Claims

1. A plurality of conductive lines; a terminal receiving box having a receiving chamber through which a plurality of the conductive wires pass; a connection terminal that is inserted into the accommodation chamber in a direction intersecting the conductive wires and electrically connects the plurality of conductive wires to each other; An electric wire connection structure having The connection terminal is A terminal connection portion; a wide portion that is wider than the terminal connection portion; a terminal tip portion provided on a tip side in an insertion direction into the accommodating chamber, and a terminal base end portion provided on a base end side in the insertion direction; a single slit having a leading end side in the insertion direction into the accommodating chamber, the leading end side being opened by a conductive wire inlet portion through which the conductive wire can pass, and a side opposite to the conductive wire inlet portion being closed by a bottom portion; Equipped with The terminal housing box includes: An end surface of the storage box provided on the opening side of the storage chamber; A bottom surface of the storage chamber provided on the opposite side to the opening side of the storage chamber; a support protrusion protruding from a bottom surface of the accommodation chamber toward an opening side and supporting the plurality of conductive wires; an insertion restriction recess into which the wide portion is inserted from an opening side of the accommodation chamber; having It is characterized in that all of the following formulas (1) to (3) are satisfied: Wire connection structure. a-(b+c)≧0 … Formula (1) (c+e)-d≧0 … Formula (2) f-(c+g)≧0...Equation (3) a: Length from the end face of the storage box to the bottom face of the storage chamber in the insertion direction b: Length from the tip end of the terminal to the base end of the terminal in the insertion direction c: Length from the end face of the container to the base end of the terminal in the insertion direction d: The length from the end face of the container box to the support protrusion in the insertion direction e: Length from the base end of the terminal to the conductive wire inlet in the insertion direction f: Length from the end face of the container to the conductive wire in the insertion direction g: Length from the base end of the terminal to the bottom in the insertion direction

2. The conductive wires connected to the connection terminal are overlapped in the insertion direction. The electric wire connection structure according to claim 1 .

3. The electric wire connection structure according to claim 1 or 2, The terminal housing box is provided with a positioning groove extending in the insertion direction of the connection terminal and positioning the plurality of conductive wires with respect to the support protrusion. Wire connection structure.

4. The conductive wire has a diameter larger than an opening width of the conductive wire inlet portion. The electric wire connection structure according to any one of claims 1 to 3.

5. A stator wound with a plurality of conductive wires; a rotor that rotates relative to the stator; a terminal receiving box having a receiving chamber through which a plurality of the conductive wires pass; a connection terminal that is inserted into the accommodation chamber in a direction intersecting the conductive wires and electrically connects the plurality of conductive wires to each other; An electric motor having The connection terminal is A terminal connection portion; a wide portion that is wider than the terminal connection portion; a terminal tip portion provided on a tip side in an insertion direction into the accommodating chamber, and a terminal base end portion provided on a base end side in the insertion direction; a single slit having a leading end side in the insertion direction into the accommodating chamber, the leading end side being opened by a conductive wire inlet portion through which the conductive wire can pass, and a side opposite to the conductive wire inlet portion being closed by a bottom portion; Equipped with The terminal housing box includes: An end surface of the storage box provided on the opening side of the storage chamber; A bottom surface of the storage chamber provided on the opposite side to the opening side of the storage chamber; a support protrusion protruding from a bottom surface of the accommodation chamber toward an opening side and supporting the plurality of conductive wires; an insertion restriction recess into which the wide portion is inserted from an opening side of the accommodation chamber; having It is characterized in that all of the following formulas (1) to (3) are satisfied: Electric motor. a-(b+c)≧0 … Formula (1) (c+e)-d≧0 … Formula (2) f-(c+g)≧0...Equation (3) a: Length from the end face of the storage box to the bottom face of the storage chamber in the insertion direction b: Length from the tip end of the terminal to the base end of the terminal in the insertion direction c: Length from the end face of the container to the base end of the terminal in the insertion direction d: The length from the end face of the container box to the support protrusion in the insertion direction e: Length from the base end of the terminal to the conductive wire inlet in the insertion direction f: Length from the end face of the container to the conductive wire in the insertion direction g: Length from the base end of the terminal to the bottom in the insertion direction

6. the plurality of conductive wires connected to the connection terminals are overlapped in the axial direction of the rotor.

6. The electric motor according to claim 5.

7. 7. The electric motor according to claim 5 or 6, The terminal housing box is provided with a positioning groove extending in an axial direction of the rotor and positioning the plurality of conductive wires with respect to the support protrusion. Electric motor.

8. The conductive wire has a diameter larger than an opening width of the conductive wire inlet portion. The electric motor according to any one of claims 5 to 7.

Images