JP7621201B2 - Wire connection structure and electric motor - Google Patents

Description

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 that has a housing chamber that houses the connection terminal.

Patent document 1 describes an electric motor in which the ends of multiple coils (conductive wires) wound around a stator core (stator) are individually and electrically connected to multiple 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.

Patent Document 2 also describes a terminal member for connecting conductor wires, in which a terminal member (connection terminal) having a slit is pressed against a case in which an end of a winding (conductive wire) is set, so that the end of the winding enters the slit, thereby electrically connecting the winding and the terminal member. Patent Document 2 eliminates the need for electrical connection work by soldering.

JP 2017-073860 A JP 2000-266083 A

The technology described in Patent Document 2 makes it possible to eliminate the need for electrical connection by soldering, while allowing one conductive wire to enter one slit. Therefore, when electrically connecting two conductive wires to each other using a connection terminal, it is necessary to align 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. As a result, 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 could damage the part (case, etc.) into which the connection terminal is inserted, resulting in the production of defective products.

The object of the present invention is to provide a wire connection structure and an electric motor that can hold multiple conductive wires with a single slit, preventing the connection terminal from widening in a direction intersecting the insertion direction, while further reducing the occurrence of defective products.

In the electric wire connection structure of the present invention, there is provided a terminal receiving box having a plurality of conductive wires, a receiving chamber through which the plurality of conductive wires pass, and a connection terminal that is inserted into the receiving chamber in a direction intersecting the conductive wires and electrically connects the plurality of conductive wires to each other, wherein the connection terminal has 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 a direction of insertion into the receiving chamber, a terminal base end portion provided on a base end side in the direction of insertion, and a terminal end portion provided on a tip side in the direction of insertion into the receiving chamber. the side opposite the conductive wire inlet portion being closed by a bottom portion, and the terminal accommodating box has 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, a support protrusion protruding from the accommodating chamber bottom face toward the opening side and supporting the plurality of conductive wires, and an insertion restricting recess into which the wide portion is inserted from the opening side of the accommodating chamber, and is characterized in that the terminal accommodating box satisfies all of the following formulas (1) to (3):

a-(b+c)≧0 … Formula (1)
(c+e)−d≧0 … Formula (2)
f-(c+g)≧0... Formula (3)
a: Length from the end face of the housing box in the insertion direction to the bottom face of the housing chamber 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 housing box in the insertion direction d: Length from the end face of the housing 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: g: Length from the end face of the container to the conductive wire in the insertion direction, and g: Length from the base end of the terminal to the bottom in the insertion direction.

In the electric motor of the present invention, there is provided a motor having a stator around which a plurality of conductive wires are wound, a rotor that rotates relative to the stator, 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 with the conductive wires and electrically connects the plurality of conductive wires to each other, the connection terminal having a terminal connection portion, a wide portion that is wider than the terminal connection portion, a terminal tip portion provided on the tip side in a direction of insertion into the housing chamber, and a terminal base end portion provided on the base end side in the direction of insertion, the terminal accommodating box has a single slit whose tip side in the insertion direction 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 has a accommodating box end face provided on the opening side of the accommodating chamber, a accommodating chamber bottom face provided on the side opposite the opening side of the accommodating chamber, a support protrusion protruding from the accommodating chamber bottom face toward the opening side and supporting the plurality of conductive wires, and an insertion restricting recess into which the wide portion is inserted from the opening side of the accommodating chamber, and is characterized in that it satisfies all of the following formulas (1) to (3):

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 housing box in the insertion direction to the bottom face of the housing chamber 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 housing box in the insertion direction d: Length from the end face of the housing 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: g: 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

According to the present invention, in the insertion direction of the connection terminal into the receiving chamber, multiple 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, it is possible to easily press the connection terminal 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 part where the connection terminal is inserted and to prevent the occurrence of defective products.

In addition, since all of the above formulas (1) to (3) are satisfied, it is possible to reliably electrically connect the multiple conductive wires to the connection terminals without damaging the terminal housing box. This makes it possible to further reduce the occurrence of defective products.

FIG. 2 is a perspective view showing an output rotor side of the electric motor. FIG. 2 is a plan view showing the output rotor side of the electric motor. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 2 is an exploded perspective view showing the cover side of the electric motor. FIG. 4 is an exploded perspective view illustrating the structure inside the cover. FIG. 2 is a perspective view of the stator core as viewed from the flat male terminal side. FIG. 7 is an enlarged perspective view of a portion B circled by a dashed line in FIG. 6 . FIG. 8 is a perspective view showing a cross section taken along line CC in FIG. 7. 8A is a cross-sectional view taken along line DD in FIG. 8, and FIG. 8B is a cross-sectional view taken along line EE in FIG. 5A and 5B are perspective views illustrating a detailed structure of a flat male terminal. FIG. 4 is a perspective view illustrating a detailed structure of a terminal receiving box. 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. FIG. 10 is a cross-sectional view illustrating judgment formula 1 and corresponding to FIG. FIG. 10 is a cross-sectional view illustrating a judgment formula 2 and corresponding to FIG. FIG. 10 is a cross-sectional view illustrating the judgment formula 3 and corresponding to FIG.

Below, one embodiment of the present invention will be described in detail with reference to the drawings.

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 along line A-A 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 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 along line C-C in FIG. 7, FIG. 9(a) is a cross-sectional view along line D-D in FIG. 8, (b) is a cross-sectional view along line E-D in FIG. 8, A cross-sectional view along line E, FIGS. 10(a) and (b) are perspective views explaining the detailed structure of the flat male terminal, FIG. 11 is a perspective view explaining the detailed structure of the terminal housing box, FIG. 12(a) is a cross-sectional view along line F-F in FIG. 11, (b) is a cross-sectional view along line G-G 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.

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

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

As shown in FIG. 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 housed inside the motor housing chamber MS is a sensor board 50 provided with three Hall sensors (magnetic sensors) HS (see FIG. 5) that detect the rotation state of the flat motor 40 (rotor 42).

As shown in FIG. 3, the case 20 is formed into a stepped, roughly bowl-like shape by casting an aluminum material or the like, and has a large diameter cylindrical section 21 and a small diameter cylindrical section 22. The large diameter cylindrical section 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 section 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.

A roughly disk-shaped partition wall 23 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 the motor housing chamber MS. The partition wall 23, together with the small diameter cylindrical portion 22, forms the reducer housing chamber RS. In other words, the partition wall 23 separates the motor housing chamber MS from the reducer housing chamber RS.

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 the shaft body 45a of the rotor shaft 45 is mounted on the radially inner side of the through hole 23a.

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 of multiple laminated steel plates, and a rotor 42 that is rotatably mounted 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 Figure 4), which allows the rotor 42 to rotate relative to the stator core 41.

An insulator 43 made of an insulating material such as plastic is attached to the stator core 41. The insulator 43 covers almost the entire stator core 41, including the multiple teeth TH (see FIG. 6), and multiple coils (conductive wires) 44 are wound in concentrated windings around the portions of the insulator 43 that correspond to the teeth TH. In other words, the coils 44 are wound around each tooth TH of the stator core 41 via the insulator 43.

The rotor 42 has 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 north and south poles appear alternately in the circumferential direction of the rotor 42. In addition, a shaft body 45a of the 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.

The rotor shaft 45 comprises 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 located 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 the first ball bearing B1, and the rotor 42 is rotatably supported by the case 20 via the rotor shaft 45.

The reduction gear housing chamber RS houses a hypocycloid reduction gear 60, which is a reduction mechanism. The hypocycloid reduction gear 60 reduces the rotation of the flat motor 40 (rotor shaft 45) and outputs it to the outside, and is equipped with an outer gear 61 and an inner gear 62.

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 radial side of the outer gear 61 is fixed to the inner radial side of the small diameter cylindrical portion 22, and a tooth portion 61a consisting of spur teeth is formed on the inner radial side of the outer gear 61.

The inner gear 62 is provided radially inside the outer gear 61, and its outer diameter is smaller than the inner diameter 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.

The center of rotation 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.

A second tooth portion 62b consisting of spur teeth is formed radially inside the first tooth portion 62a of the inner gear 62. The second tooth portion 62b is meshed with a tooth portion 63a consisting of spur teeth of the output rotor 63. 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 its 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.

The output rotor 63 is rotatably supported at its radially inner side by a third ball bearing B3 provided on the second shaft portion 45c, and at its radially 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.

The cover member 64 closes the reduction gear 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 Figures 1 and 2.

As shown in FIG. 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 a flat-shaped electric motor 10, it is possible to easily accommodate further flattening (thinning) of the electric motor 10. The "reduction ratio (1/90)" mentioned here means that when the rotor shaft 45 rotates at high speed 90 times, the output rotor 63 finally rotates once in a high-torque state.

As shown in Figures 3 to 5, the cover 30 is formed into a roughly bowl-like shape by injection molding a resin material such as plastic. The cover 30 has a disk-shaped bottom wall portion 31 and a cylindrical side wall portion 32 that is integral with 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.

In addition, a fixing plate 34 (see Figures 1 and 3) is provided on the outside of the side wall 32 and in the area of the grommet 33 to prevent the grommet 33 from falling off. The fixing plate 34 is fixed to the side wall 32 by a pair of fixing screws SC4.

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

As shown in FIG. 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 inside each of them are mounted a flat female terminal M1 crimped to the longitudinal base end of the U-phase power supply line 70u, a flat female terminal M2 crimped to the longitudinal base end of the V-phase power supply line 70v, and a flat female terminal M3 crimped to the longitudinal base end of the W-phase power supply line 70w.

In addition, rod-shaped engaging protrusions 36a, 36b are provided on the inside of the side wall 32 on the first cover part C1 side and the second cover part C2 side. These engaging protrusions 36a, 36b protrude to a height dimension that exceeds the side wall 32 of the cover 30, and have the 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 the engaging recesses (not shown) of the case 20.

This allows the cover 30 to be positioned accurately relative to the case 20, while allowing them to be securely attached to each other. Furthermore, simply by 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 respective flat female terminals M1, M2, and M3.

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.

As a result, by supplying drive current to each of the power supply lines 70u, 70v, and 70w at a predetermined timing, power is supplied to the coils 44 (see Figures 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 Figures 4 and 6). As a result, the rotor 42 (see Figures 3 and 4) is driven to rotate in the forward or reverse direction at a predetermined rotational speed.

Furthermore, as shown in FIG. 5, the sensor board 50 and the anti-drop plate 90 are housed inside the cover 30. The anti-drop 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.

On the side of the first cover part C1 in the bottom wall part 31 of the cover 30, three first holding grooves G1 are provided to hold each of the power supply lines 70u, 70v, and 70w individually. This allows the power supply lines 70u, 70v, and 70w to be easily routed inside the cover 30 without interfering with or crossing each other.

In addition, a single second holding groove G2 that holds the sensor cable 80 is provided on the second cover part C2 side of the bottom wall part 31 of the cover 30. Here, the sensor cable 80 is thicker than each of the power supply lines 70u, 70v, and 70w. Therefore, the width dimension of the second holding groove G2 is larger than the width dimension of the first holding groove G1.

Furthermore, a relatively large storage space SP for storing the sensor cable 80 is provided on the second cover part C2 side of the cover 30 and near the second holding groove G2. This allows the sensor cable 80 to bend significantly while being given slack inside the cover 30. Therefore, the sensor cable 80 can be routed between the sensor board 50 and the second holding groove G2 without being forcibly bent.

In this way, the U-phase, V-phase, and W-phase power supply lines 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 ensures that the power supply lines 70u, 70v, and 70w and the sensor cable 80 do not come into contact with or cross each other inside the cover 30.

This reliably prevents short circuits between the power supply lines 70u, 70v, and 70w and the sensor cable 80, improving the reliability of the motor 10. Furthermore, the power supply lines 70u, 70v, and 70w and the sensor cable 80 can be easily routed to the cover 30, which in turn improves the ease of assembly of the motor 10.

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). The sensor board 50 is a printed circuit board to which multiple electronic components, including three Hall sensors HS, are soldered and which functions as an electronic circuit.

The three Hall sensors HS provided on the sensor board 50 are arranged at a predetermined interval 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 magnet 42b in the axial direction of the rotor 42 (see Figures 3 and 4). As a result, the three Hall sensors HS perform switching operations in response to the changeover of 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.

The sensor cable 80 is electrically connected to the sensor board 50, and the 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 is applied to the sensor cable 80, there is a risk of solder cracks (poor electrical 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.

As shown in Figures 1, 2, 4, and 5, the portions of the power supply lines 70u, 70v, and 70w that are pulled out to the outside of the cover 30 are provided with first connector connection parts CN1 to which an external power connector (not shown) is connected. Furthermore, the portions of the sensor cable 80 that are pulled out to the outside of the cover 30 are provided with second connector connection parts CN2 to which an external control connector (not shown) is connected.

In this way, by separating the power supply system cables (power supply lines 70u, 70v, 70w) and the control system cables (sensor cable 80), it is possible to prevent electrical noise and other issues radiated from the power supply system cables from adversely affecting the control system cables.

As shown in FIG. 5, the fall-prevention plate 90 is formed in a generally disk-like shape from a resin material such as plastic. The fall-prevention plate 90 has a generally rectangular cutout 93, in which the sensor board 50 is disposed. This eliminates the need to overlap the fall-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.

Furthermore, a total of five screw holes 96 are provided in the radially outer portion of the fall-off prevention plate 90, aligned in the circumferential direction. Fixing screws SC6 (a total of five) are inserted into each of these screw holes 96, thereby fixing the fall-off prevention plate 90 to the inside of the cover 30 without rattling.

In addition, a total of three support protrusions 97 are integrally provided on the radially outer portion of the fall-off prevention plate 90 so as to be aligned in the circumferential direction. These support protrusions 97 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 (details not shown).

This prevents the flat female terminals M1, M2, and M3 from tilting when connecting the flat male terminals T1, T2, and T3 (see Figures 4 and 6) on the case 20 side to the flat female terminals M1, M2, and M3. This ensures that the flat male terminals T1, T2, and T3 can be electrically connected to the flat female terminals M1, M2, and M3.

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. In other words, these terminal housing boxes 100a, 100b, and 100c are also formed from 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 when the motor 10 is assembled, it faces each of the terminal holders 35a, 35b, and 35c (see FIG. 5) provided on the cover 30 in the axial direction of the motor 10.

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 each other. Below, the detailed structure of the terminal housing box 100a for the U-phase, which is enclosed by the dashed circle B in Figure 6, will be explained as a representative. For ease of explanation, it is referred to as the terminal housing box 100 in Figures 7 to 15.

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 in 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 Figure 6, will be described below. For ease of explanation, the terminal is referred to as a flat male terminal 200 in Figures 7 to 15.

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 flat male terminal 200 scrapes off the enamel paint (not shown) applied to the surface of each coil end 44a. 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.

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 Figures 7 to 10 by pressing and bending a highly conductive brass plate or the like. Specifically, the flat male terminal 200 has a flat terminal connection portion 201 that is inserted into the flat female terminal M1 (see Figure 5), and a terminal main body portion 202 that is inserted into the housing chamber 101 of the terminal housing box 100 in a direction that intersects with the pair of coil ends 44a (coils 44).

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 receiving chamber 101 of the terminal receiving 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.

As shown in Figures 10(a) and (b), the terminal body 202 is formed in a hollow, generally box-like shape and is inserted into the housing chamber 101 of the terminal housing box 100.

In addition, a terminal tip portion 202a that faces the bottom surface 103 (see FIG. 11) of the accommodation chamber 101 is provided at the tip side of the terminal body portion 202 in the insertion direction into the accommodation chamber 101. In addition, a terminal base end portion 202b that faces the axial cover 30 side of the electric motor 10 is provided at the base end side of the terminal body portion 202 in the insertion direction into the accommodation chamber 101.

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 integrally provided.

A single slit 204 is provided in the terminal body 202. As shown in Figs. 9(a) and (b), a pair of coil ends 44a are inserted into this slit 204. In other words, the slit 204 holds the pair of coil ends 44a (coils 44) side-by-side and overlapping in the insertion direction of the terminal body 202 into the housing chamber 101.

The slit 204 is open on the terminal tip 202a side in the insertion direction into the accommodation chamber 101, and is cut out to a predetermined depth toward the terminal base end 202b. The open side of the slit 204 (lower side in Figs. 9 and 10) is provided with a coil inlet 204a through which a pair of coil ends 44a can pass, and the side of the slit 204 opposite the coil inlet 204a (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.

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

However, it is preferable that the opening width W1 of the slit 204 is approximately half (approximately 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.

Here, the terminal body 202 has only one slit 204 extending in the insertion direction of the pair of coil ends 44a, so as shown in FIG. 9, it is possible to suppress an increase in the widthwise dimension (left-right direction in the figure) of the terminal body 202. As can be seen from FIG. 6, this means that 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.

In addition, because the increase in the width dimension of the terminal body 202 is suppressed, it is possible to make the flat male terminal 200 into a vertically elongated shape as shown in FIG. 9. Therefore, it is possible to easily press the flat male terminal 200 straight in the insertion direction without worrying about the pressing balance of the terminal body 202. This means that damage to the terminal housing box 100 is suppressed, and thus the occurrence of defective products is suppressed.

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 Figures 9 and 10). The guide opening 205 has the function of guiding (inducing) the pair of coil ends 44a to the coil inlet 204a and the slit 204. Specifically, the opening width W2 (see Figures 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 makes it possible to easily and reliably insert 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, into the slits 204.

The terminal body 202 is provided with a number of retaining projections 206 that prevent the terminal body 202 from falling out of the accommodation chamber 101. Specifically, as shown in Figures 9(a) and (b), the retaining projections 206 are arranged on both sides (left and right sides in the figure) of the terminal body 202, and their cross sections are formed in 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 bite into and hook onto the accommodation chamber side wall 104.

Next, the structure of the terminal housing box 100 will be described in detail with reference to the drawings. As shown in Figs. 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 Fig. 8) and which houses the terminal body portion 202 (see Fig. 10) of the flat male terminal 200.

The terminal housing box 100 also has a housing box end surface 102 provided on the opening side of the housing chamber 101 (upper side in FIG. 12), and a housing chamber bottom surface 103 provided on the opposite side to the opening side of the housing chamber 101 (lower side in FIG. 12). A housing chamber side wall 104 is provided upright from the housing chamber bottom surface 103 toward the opening side of the terminal housing box 100. In other words, the housing chamber 101 is surrounded by the housing chamber bottom surface 103 and the housing chamber side wall 104.

Furthermore, inside the terminal housing box 100, a pair of insertion restriction recesses 105 are provided into which the wide portion 203 (see FIG. 10) of the flat male terminal 200 is inserted. These insertion restriction recesses 105 form part of the housing chamber 101, and are shallower in depth from the housing box end face 102 than the housing chamber 101. Specifically, the depth dimension of the insertion restriction recesses 105 is approximately 1/4 the depth dimension of the housing chamber 101 (see FIG. 12).

Then, on the opening side of the accommodation chamber 101 and the insertion restriction recess 105, a first inclined wall portion 106 is provided to guide the insertion of the terminal body portion 202 and the wide portion 203 of the flat male terminal 200. 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 restriction recess 105. This makes it easy to insert the flat male terminal 200 into the terminal accommodation box 100.

In addition, a support protrusion 107 that supports a pair of coil ends 44a (see Figures 8 and 9(a)) is provided in the approximate center of the bottom surface 103 of the accommodation chamber of the terminal accommodation box 100. Specifically, the support protrusion 107 protrudes from the bottom surface 103 of the accommodation chamber toward the opening side of the accommodation chamber 101, and supports the pair of coil ends 44a in a state where they overlap in the protruding direction of the support protrusion 107 (see Figures 8 and 9(a)). The protruding height of the support protrusion 107 from the bottom surface 103 of the accommodation chamber is approximately 1/3 the depth dimension of the accommodation chamber 101 (see Figure 12).

As shown in FIG. 9(a), the support protrusions 107 are inserted into 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 204a and the slit bottom 204b of the slit 204.

As shown in the shaded areas of Figures 13 to 15, the area (prescribed position) between the coil inlet 204a and the slit bottom 204b of the slit 204 is the effective crimping range AR where the pair of coil ends 44a and the terminal body 202 can be securely electrically connected to each other. In other words, in this embodiment, the pair of coil ends 44a can be positioned in the effective crimping range AR of the slit 204 simply by inserting the terminal body 202 into the accommodation chamber 101.

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. In other words, 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 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.

As shown in FIG. 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).

The pair of coil ends 44a that fit into the pair of positioning grooves 108 are aligned at the tip of the support protrusion 107 in the direction in which the flat male terminal 200 is inserted into the terminal housing box 100, in other words, in the axial direction of the rotor 42, as shown in Figures 8 and 9(a). In this way, the pair of positioning grooves 108 have the function of positioning the pair of coil ends 44a in the correct position relative to the support protrusion 107.

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

The electric wire connection structure of the electric motor 10 according to this embodiment is configured to satisfy all of the judgment formulas 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 judgment formulas 1, 2, and 3.

The flat male terminal 200 is inserted into the terminal receiving box 100 by an assembly worker (manual) or an automated assembly device (automatic) using a pressing tool (not shown). In addition, 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.

[Determination 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".

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 housing box end surface 102 to the housing chamber bottom surface 103 b: Length from the terminal tip portion 202a to the terminal base portion 202b c: Length from the housing box end surface 102 to the terminal base portion 202b

By configuring the terminal 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.

The stroke amount of the pressing tool 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. This simplifies the shape of the pressing tool while making it easier to manage its stroke amount, simplifying the work process. It also makes it possible to more reliably prevent defects such as cracks in the terminal housing box 100.

[Determination 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".

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

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 positioned closer to the slit 204 (upper side in the figure) than the coil inlet 204a, and fall within the effective pressure welding range AR (shaded area in the figure). In other words, 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 conductivity of the pair of coil ends 44a.

In addition, in the case of the judgment formula 2, as explained in the judgment formula 1 above, it is also possible to make "c = 0" by adjusting the stroke amount of the pressing tool.

[Determination 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".

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 housing box end surface 102 to the coil end 44a (coil 44), c: length from the housing box end surface 102 to the terminal base end 202b, g: length from the terminal base end 202b to the slit bottom 204b, where "f" can be replaced with "d-(DA x n)", where DA is the diameter of the coil end 44a, and n is the number of coil ends 44a (n = 2 in this embodiment).

By configuring the terminal so as to satisfy the judgment formula 3, when the flat male terminal 200 is inserted into the terminal housing box 100, the pair of coil ends 44a are positioned closer to the slit 204 side (lower in the figure) than the slit bottom 204b, and fall within the effective pressure welding range AR (shaded area in the figure). In other words, judgment formula 3 is a judgment 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 conductivity of the pair of coil ends 44a, just like judgment formula 2 above.

In addition, in the case of the judgment formula 3, as explained in the judgment formula 1 above, it is also possible to make "c = 0" by adjusting the stroke amount of the pressing tool.

As described above in detail, according to this embodiment, in the insertion direction of the flat male terminal 200 into the accommodating chamber 101 (the axial direction of the rotor 42), 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 wider 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. This eliminates damage to the portion (terminal receiving box 100) into which the flat male terminal 200 is inserted, and reduces the occurrence of defective products.

Furthermore, since all of the judgment formulas 1, 2, and 3 shown in Figures 13, 14, and 15 are satisfied, the multiple coil ends 44a and the flat male terminals 200 can be reliably electrically connected without damaging the terminal housing box 100. This makes it possible to further reduce the occurrence of defective products.

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

In addition, according to this embodiment, the terminal housing box 100 is provided with positioning grooves 108 that extend in the insertion direction (axial direction of the rotor 42) of the flat male terminal 200 into the housing chamber 101 and position the pair of coil ends 44a relative to the support protrusions 107. Therefore, 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 (axial direction of the rotor 42) of the flat male terminal 200 into the terminal housing box 100. This improves the ease of assembly.

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 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.

In addition, 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).

The present invention is not limited to the above embodiment, and it goes without saying that various modifications are possible without departing from the gist of the 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 also be applied to devices for other purposes, such as as a driving source for welfare equipment such as wheelchair devices.

The material, shape, dimensions, number, installation location, etc. of each component in the above embodiment are arbitrary as long as they can achieve the present invention, and are not limited to the above embodiment.

10: Electric motor, 20: Case, 21: Large diameter cylinder, 22: Small diameter cylinder, 23: Partition wall, 23a: Through hole, 30: Cover, 31: Bottom wall, 32: Side wall, 33: Grommet, 34: Fixing plate, 35a to 35c: Terminal holder, 36a, 36b: Engagement protrusion, 40: Flat motor, 41: Stator core (stator), 42: Rotor, 42a: Main body, 42b: Permanent magnet, 43: Insulator, 44: Coil (conductor wire, electric wire connection structure), 44a: Coil end (electric wire connection structure), 45: Rotor shaft, 45a: Shaft 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 (electrical wire connection structure), 100a to 100c: terminal housing box, 101: housing chamber , 102: end surface of the housing box, 103: bottom surface of the housing chamber, 104: side wall of the housing chamber, 105: insertion restriction recess, 106: first inclined wall portion, 107: support protrusion, 108: positioning recess, 109: opposing wall portion, 110: second inclined wall portion, 200: flat male terminal (connection terminal, electric wire connection structure), 201: terminal connection portion, 202: terminal main body portion, 202a: terminal tip portion, 202b: terminal base end portion, 203: wide portion, 204: slit, 204a: coil inlet portion (conductor wire inlet portion), 204b: slit bottom portion (bottom portion), 205: guide opening portion, 206: slip-out prevention projection, AR: pressure contact effective range, 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, RS: reducer housing, SC1-SC6: fixing screw, SP: housing space, T1-T3: flat male terminal (connection terminal), TH: teeth

Claims (8)

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... Formula (3)
a: Length from the end face of the accommodating box to the bottom face of the accommodating 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 accommodating box to the base end of the terminal in the insertion direction d: Length from the end face of the accommodating 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 accommodating box to the conductive wire in the insertion direction g: Length from the base end of the terminal to the bottom in the insertion direction The conductive wires connected to the connection terminal are overlapped in the insertion direction.
The electric wire connection structure according to claim 1 . 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. 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. A stator having a plurality of conductive wires wound thereon;
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 accommodating box to the bottom face of the accommodating 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 accommodating box to the base end of the terminal in the insertion direction d: Length from the end face of the accommodating 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 accommodating box to the conductive wire in the insertion direction g: Length from the base end of the terminal to the bottom in the insertion direction 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. 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. 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