Electrical connection structure

Abstract

The present invention addresses the problem of disposing a first bus bar and a second bus bar above a capacitor unit without bending the first bus bar and the second bus bar so as to extend from above the capacitor unit to a terminal of a circuit unit. In order to solve the problem, the electrical connection structure is provided with a first stud, a first collar, and a first screwing member. The circuit unit is mounted on the base. And a first stud protruding upward from an end portion of the base on the capacitor unit side. The first lantern ring is an electric conductor with internal threads on the upper and lower sides, and the lower part is screwed on the first stud. And a first screwing member which fastens the first bus bar to the upper portion of the first collar such that the first bus bar is positioned above the capacitor unit. The second bus bar is likewise arranged.

Description

Technical Field

[0001] The invention relates to an electrical connection structure for electrically connecting a plurality of components. Background Art

[0002] The internal structure of the motor device comprises the following: a predetermined circuit unit is mounted on a base. The positive terminal of the circuit unit is electrically connected to the positive terminal of the capacitor unit. Furthermore, the negative terminal of the circuit unit is electrically connected to the negative terminal of the capacitor unit.

[0003] [Prior Art Literature]

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-131919 Summary of the Invention

[0006] [Problems to be solved by the invention]

[0007] In this case, the inventors considered further electrically connecting the first busbar to the positive terminal of the circuit unit and the positive terminal of the capacitor unit, and further electrically connecting the second busbar to the negative terminal of the circuit unit and the negative terminal of the capacitor unit.

[0008] However, the inventors have noted that this situation presents the following problems: When the capacitor is lower than the circuit unit, the first and second busbars can be easily positioned above the capacitor. However, when the capacitor unit is higher than the circuit unit, positioning the first and second busbars above the capacitor unit becomes difficult.

[0009] As a countermeasure, one approach could be to place a first busbar and a second busbar between the circuit unit and the capacitor unit. However, this would increase the distance between the circuit unit and the capacitor unit. This would increase the parasitic inductance between the circuit unit and the capacitor unit, leading to an increase in the size of the capacitor itself.

[0010] On the other hand, if the first and second busbars are forcibly positioned above the capacitor unit, the ends of the first and second busbars on the circuit unit side must be bent so that they extend from above the capacitor unit to the terminals of the circuit unit. This increases the number of bending and pressing operations required for the first and second busbars, leading to increased costs.

[0011] The present invention has been made in view of the above situation, and an object of the present invention is to dispose the first bus bar and the second bus bar above the capacitor unit without bending them so as to extend from above the capacitor unit to the terminals of the circuit unit.

[0012] [Technical means to solve the problem]

[0013] The present inventors have discovered that the above-mentioned object can be achieved by using a collar as a conductor, and have thus completed the present invention. The present invention is the following electrical connection structures (1) to (3).

[0014] (1) An electrical connection structure electrically connecting a positive terminal of a circuit unit mounted on a base, a positive terminal of a predetermined capacitor unit, and a predetermined first bus bar, and electrically connecting a negative terminal of the circuit unit, a negative terminal of the capacitor unit, and a predetermined second bus bar, and

[0015] The upper surface of the capacitor unit is located higher than the upper surface of the base.

[0016] The electrical connection structure comprises:

[0017] A first stud and a second stud protrude upward from an end portion of the base on the capacitor unit side, respectively;

[0018] The first collar is a conductive body with internal threads on both sides, the lower portion of which is screwed to the first stud and electrically connected to the positive terminal of the circuit unit and the positive terminal of the capacitor unit;

[0019] The second collar is a conductive body with internal threads on both sides, the lower portion of which is screwed to the second stud and electrically connected to the negative terminal of the circuit unit and the negative terminal of the capacitor unit;

[0020] a first screw-fastening member for fastening the first busbar to the upper portion of the first collar in a manner such that the first busbar is located above the capacitor unit, thereby electrically connecting the first busbar to the first collar; and

[0021] The second screw-fastening member fastens the second busbar to the upper portion of the second collar in a manner that the second busbar is located above the capacitor unit, thereby electrically connecting the second busbar to the second collar.

[0022] According to this structure, the first busbar and the second busbar can be arranged above the capacitor unit by using the first and second collars. Moreover, due to the use of these first and second collars, it is no longer necessary to bend the first busbar and the second busbar so that they extend from above the capacitor unit to the terminals of the circuit unit.

[0023] As described above, according to this structure, the first bus bar and the second bus bar can be arranged above the capacitor unit without being bent so as to extend from above the capacitor unit to the terminals of the circuit unit.

[0024] (2) The electrical connection structure according to (1), wherein the first stud and the second stud are components of the same shape,

[0025] The first ring and the second ring are parts of the same shape.

[0026] The first screw-fastening member and the second screw-fastening member are members of the same shape.

[0027] According to this structure, the types of components can be reduced, and the electrical connection structure can be simplified.

[0028] (3) The electrical connection structure according to (1) or (2), wherein the circuit unit comprises a portion of a drive circuit for driving a vehicle's travel motor.

[0029] The capacitor unit includes a smoothing capacitor in the drive circuit.

[0030] According to this configuration, the above-described effects can be obtained in the drive circuit that drives the travel motor.

[0031] (Effects of the Invention)

[0032] As described above, according to the structure of (1), the first busbar and the second busbar can be arranged above the capacitor unit without being bent so as to extend from above the capacitor unit to the terminals of the circuit unit. Furthermore, according to the structures of (2) and (3), respective additional effects can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a perspective view illustrating the electrical connection structure and its surroundings of the first embodiment.

[0034] Figure 2 It is a front view showing the electrical connection structure.

[0035] Figure 3 It is a drawing Figure 1 Figure 2 is a cross-section of the fg3-fg3 line.

[0036] Figure 4 A circuit diagram that depicts the electrical connection structure and its surroundings.

[0037] Figure 5 It is a three-dimensional diagram illustrating a comparative electrical connection structure and its surroundings. DETAILED DESCRIPTION

[0038] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments and can be implemented with appropriate modifications within the scope of the present invention.

[0039] [First embodiment]

[0040] like Figure 1 As shown, the electrical connection structure 30 of this embodiment is mainly composed of six collars 33 and 34. The six collars 33 and 34 are composed of three first collars 33 and three second collars 34. The three first collars 33 electrically connect the positive terminal 40p of the circuit unit 40, the positive terminal 20p of the capacitor unit 20, and the first busbar B1. The three second collars 34 electrically connect the negative terminal 40n of the circuit unit 40, the negative terminal 20n of the capacitor unit 20, and the second busbar B2.

[0041] like Figure 4 As shown, circuit unit 40 includes a portion of a voltage conversion circuit Cc that converts voltage. Capacitor unit 20 includes a smoothing capacitor sC in voltage conversion circuit Cc. Voltage conversion circuit Cc boosts the voltage supplied from battery B and supplies it to drive unit D. Both voltage conversion circuit Cc and the circuits within drive unit D are part of the drive circuit that drives the vehicle's travel motor.

[0042] The voltage conversion circuit Cc includes three-phase coils CoU, CoV, and CoW, three semiconductor switches SwU, SwV, and SwW, three diodes DoU, DoV, and DoW, and a smoothing capacitor sC. The portion of the voltage conversion circuit Cc including the three semiconductor switches SwU, SwV, and SwW and the three diodes DoU, DoV, and DoW constitutes the circuitry of the aforementioned circuit unit 40.

[0043] The three-phase coils CoU, CoV, and CoW consist of the U-phase coil CoU, the V-phase coil CoV, and the W-phase coil CoW. The three semiconductor switches SwU, SwV, and SwW consist of the U-phase switch SwU, the V-phase switch SwV, and the W-phase switch SwW. The three diodes DoU, DoV, and DoW consist of the U-phase diode DoU, the V-phase diode DoV, and the W-phase diode DoW.

[0044] One end of each of the three coils CoU, CoV, and CoW is electrically connected to the positive terminal Bp of battery B. The other end of the U-phase coil CoU is electrically connected to the anode terminal of the U-phase diode DoU and to the positive terminal of the U-phase switch SwU. The other end of the V-phase coil CoV is electrically connected to the anode terminal of the V-phase diode DoV and to the positive terminal of the V-phase switch SwV. The other end of the W-phase coil CoW is electrically connected to the anode terminal of the W-phase diode DoW and to the positive terminal of the W-phase switch SwW.

[0045] The cathode terminals of the three diodes DoU, DoV, and DoW are electrically connected to the three first rings 33 via three parallel positive terminals 40 p on the output side of the circuit unit 40 .

[0046] The negative terminal of each of the three semiconductor switches SwU, SwV, and SwW is electrically connected to the negative terminal Bn of the battery B and is electrically connected to the three second rings 34 via three parallel negative terminals 40 n on the output side of the circuit unit 40 .

[0047] The three first loops 33 are electrically connected to the positive terminal of the smoothing capacitor SC via the three parallel positive terminals 20p of the capacitor unit 20. The three second loops 34 are electrically connected to the negative terminal of the smoothing capacitor SC via the three parallel negative terminals 20n of the capacitor unit 20.

[0048] Furthermore, the three first collars 33 are electrically connected to the positive terminal Dp of the drive unit D via the first busbar B1 . Furthermore, the three second collars 34 are electrically connected to the negative terminal Dn of the drive unit D via the second busbar B2 .

[0049] The following, such as Figure 1 As shown in the figure, two predetermined directions perpendicular to each other in the horizontal plane are referred to as the "X direction" and the "Y direction." Furthermore, one side in the X direction is referred to as the "X-side," and the opposite side is referred to as the "X+side." Furthermore, one side in the Y direction is referred to as the "Y-side," and the opposite side is referred to as the "Y+side."

[0050] like Figure 2 As shown, the circuit unit 40 is mounted on the upper surface of the base 50. The capacitor unit 20 is provided on the X-side of the base 50. The upper surface of the capacitor unit 20 is located higher than the upper surface of the base 50.

[0051] Figure 1 The electrical connection structure 30 shown, in addition to the six collars 33 and 34 described above, also includes six studs 31 and 32 and six screw-fastening components 35 and 36. The six studs 31 and 32 are composed of three first studs 31 and three second studs 32. The six screw-fastening components 35 and 36 are composed of three first screw-fastening components 35 and three second screw-fastening components 36.

[0052] Each first stud 31 and each second stud 32 are components of the same shape. Each first collar 33 and each second collar 34 are components of the same shape. Each first screw-fastening component 35 and each second screw-fastening component 36 are components of the same shape.

[0053] The six studs 31 and 32 are arranged in the Y direction at the end portion of the X-side of the base 50. Specifically, the first studs 31 and the second studs 32 are alternately arranged in the Y direction. Figure 2 、 Figure 3 As shown, each stud 31 , 32 is screwed into a screw hole 50 h provided on the base 50 , and protrudes upward from the base 50 .

[0054] like Figure 3 As shown, each of the six collars 33, 34 is a conductive body with internal threads on the upper and lower sides.

[0055] like Figure 1 As shown, the lower portion of each first ring 33 is screwed to the first stud 31 corresponding to the first ring 33. Figure 4 As shown, the three parallel positive terminals 40 p on the output side of the circuit unit 40 are electrically connected to the three first rings 33 .

[0056] like Figure 1 As shown, the lower portion of each second ring 34 is screwed to the second stud 32 corresponding to the second ring 34. Figure 4 As shown, the three parallel negative terminals 40 n on the output side of the circuit unit 40 are electrically connected to the three second rings 34 .

[0057] like Figure 1 As shown, between each first collar 33 and the base 50, a positive terminal 20p corresponding to the first collar 33 in the capacitor unit 20 is inserted. Figure 4 As shown, the three parallel positive terminals 20 p of the capacitor unit 20 are electrically connected to the three first rings 33 .

[0058] like Figure 1 As shown, between each second collar 34 and the base 50, a negative terminal 20n corresponding to the second collar 34 in the capacitor unit 20 is inserted. Figure 4 As shown, the three parallel negative terminals 20 n of the capacitor unit 20 are electrically connected to the three second rings 34 .

[0059] like Figure 1 As shown, a portion of the first busbar B1 corresponding to the first collar 33 is mounted on the upper end of each first collar 33 via a first screw-fastening member 35. Thus, the first busbar B1 is electrically connected to the three first collars 33 and is positioned above the capacitor unit 20.

[0060] The portion of the second busbar B2 corresponding to the second collar 34 is mounted on the upper end of each second collar 34 via a second screw member 36. Thus, the second busbar B2 is electrically connected to the three second collars 34 and is positioned above the capacitor unit 20.

[0061] Specifically, the second bus bar B2 is provided just above the capacitor unit 20 with a gap therebetween. The first bus bar B1 is provided just above the second bus bar B2 with a gap therebetween.

[0062] The following will be Figure 1 In the embodiment shown in FIG. 1 , the electrical connection structure 30 is removed. Figure 5 As shown in FIG. 1 , the state in which the first busbar B1 and the second busbar B2 are arranged between the circuit unit 40 and the capacitor unit 20 is referred to as a “comparative state”.

[0063] Hereinafter, the structure and effects of this embodiment will be summarized by comparison with comparative embodiments.

[0064] like Figure 1 As shown, in this embodiment, the first busbar B1 is fastened to the upper end of the first collar 33 using the first screw member 35, thereby being positioned above the capacitor unit 20. Furthermore, the second busbar B2 is fastened to the upper end of the second collar 34 using the second screw member 36, thereby being positioned above the capacitor unit 20. Therefore, the first busbar B1 and the second busbar B2 can be positioned above the capacitor unit 20 by means of the first collar 33 and the second collar 34.

[0065] Therefore, there is no need to Figure 5 As in the comparative example shown, the first bus bar B1 and the second bus bar B2 are arranged between the capacitor unit 20 and the circuit unit 40. Figure 1 In the embodiment shown, the distance in the X direction from the circuit unit 40 to the capacitor unit 20 can be shortened. Therefore, the entire assembly including the circuit unit 40, the capacitor unit 20, the first bus bar B1, and the second bus bar B2 can be compactly assembled in the X direction.

[0066] Furthermore, by shortening the distance between the circuit unit 40 and the capacitor unit 20, the parasitic inductance between them can be reduced. This allows for a smaller capacitor unit 20, which in turn reduces the size and weight of the entire assembly, further improving fuel efficiency. Furthermore, by shortening the distance between the circuit unit 40 and the capacitor unit 20, the resistance between them can be reduced, which also improves fuel efficiency.

[0067] Furthermore, the use of the first and second collars 33 and 34 eliminates the need to bend the first and second busbars B1 and B2 so that they extend from above the capacitor unit 20 to the terminals of the circuit unit 40. Consequently, the number of times the first and second busbars B1 and B2 are bent and pressed is reduced, leading to cost savings.

[0068] like Figure 1 As shown, each first stud 31 and each second stud 32 are components of the same shape. Each first collar 33 and each second collar 34 are components of the same shape. Each first screw-fastening component 35 and each second screw-fastening component 36 are components of the same shape. In summary, the number of components can be reduced, and the electrical connection structure 30 can be constructed concisely.

[0069] The circuit unit 40 and the capacitor unit 20 are part of a drive circuit that drives a vehicle's driving motor. Therefore, according to this embodiment, the drive circuit can be compactly integrated in the X direction.

[0070] [Other embodiments]

[0071] The above-described embodiment can be modified as follows, for example.

[0072] You can Figure 1 The quantity of the first screw 31, the first collar 33 and the first screw-fastening component 35 shown in the figure is set to below two, or more than four. Similarly, the quantity of the second screw 32, the second collar 34 and the second screw-fastening component 36 can be set to below two, or more than four.

[0073] The circuit unit 40 may include a portion of a predetermined circuit such as an inverter circuit instead of a portion of the voltage conversion circuit Cc. Furthermore, the capacitor unit 20 may include a capacitor constituting a portion of the predetermined circuit instead of the smoothing capacitor sC constituting a portion of the voltage conversion circuit Cc.

[0074] Reference numerals

[0075] 20 capacitor units

[0076] 30 electrical connection structure

[0077] 31 First Stud

[0078] 32 second stud

[0079] 33 First Ring

[0080] 34 Second Ring

[0081] 35 first screw fixing component

[0082] 36 second screw fixing component

[0083] 40 circuit units

[0084] 50 bases

[0085] B1 first bus

[0086] B2 second bus

[0087] sC smoothing capacitor

Claims

1. An electrical connection structure, wherein a positive terminal of a circuit unit mounted on a base, a positive terminal of a predetermined capacitor unit, and a predetermined first busbar are electrically connected to each other, and a negative terminal of the circuit unit, a negative terminal of the capacitor unit, and a predetermined second busbar are electrically connected to each other, and wherein: The upper surface of the capacitor unit is located higher than the upper surface of the base. The electrical connection structure comprises: A first stud and a second stud protrude upward from an end portion of the base on the capacitor unit side, respectively; The first collar is a conductive body with internal threads on both sides, the lower portion of which is screwed to the first stud and electrically connected to the positive terminal of the circuit unit and the positive terminal of the capacitor unit; The second collar is a conductive body with internal threads on both sides, the lower portion of which is screwed to the second stud and electrically connected to the negative terminal of the circuit unit and the negative terminal of the capacitor unit; a first screw-fastening member for fastening the first busbar to the upper portion of the first collar in a manner such that the first busbar is located above the capacitor unit, thereby electrically connecting the first busbar to the first collar; and The second screw-fastening member fastens the second busbar to the upper portion of the second collar in a manner that the second busbar is located above the capacitor unit, thereby electrically connecting the second busbar to the second collar.

2. The electrical connection structure according to claim 1, wherein: The first stud and the second stud are components of the same shape. The first ring and the second ring are parts of the same shape. The first screw-fastening member and the second screw-fastening member are members of the same shape.

3. The electrical connection structure according to claim 1 or 2, wherein: The circuit unit comprises a portion of a drive circuit for driving a vehicle's driving motor. The capacitor unit includes a smoothing capacitor in the drive circuit.

Images