JP2013074711A - Motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability when removing a temperature sensor along with a cable etc.SOLUTION: A terminal block 40 fixed to an internal and external boundary of a case 11 includes a continuous hole 42 that communicates between inside and outside of the case 11. A cable 32 connects a temperature sensor 20 attached to a temperature measuring part 16 of a stator 14 of a motor 12 housed in a case 11 with a connector 30 attached to an electronic control unit outside the case 11. A rubber plug 38 capable of sealing the continuous hole 42 as an encapsulation component, is fitted onto an outer peripheral surface at one region of the cable 32 in a lengthwise direction, and the cable 32 is attached to the terminal block 40 in a state that the continuous hole 42 is sealed with the rubber plug 38. The continuous hole 42 is formed such that the temperature sensor 20 can pass therethrough. Therefore, when removing the temperature sensor 20 along with the cable 32 and the connector 30 for replacement etc., the temperature sensor 20 can be removed with the connector 30 and the cable 32 without the need of removing the terminal block 40 from the case 11.

Description

  TECHNICAL FIELD The present invention relates to an electric motor device, and more specifically, a motor connecting a motor housed in a case, a temperature sensor attached to a predetermined part of the electric motor, and a connector attached to a device outside the case, and fixed to a boundary inside and outside the case. And a terminal block to be provided.

  Conventionally, as a structure related to this type of electric motor device, a temperature sensor that detects the temperature of a coil wound around a stator core of a motor is attached to a terminal block provided at a coil end portion, and a cable from the temperature sensor is connected to the terminal block. There has been proposed a cable in which a hole is passed from the internal space to the outside in a sealed state (see, for example, Patent Document 1). In this technique, this prevents the oil for cooling the motor from entering the terminal block through the cable.

JP 2010-141968 A

  However, in the above-described structure, when the temperature sensor or cable is removed for replacement or the like, the temperature sensor cannot be pulled out from the hole of the terminal block, and it is necessary to remove the terminal block together with the temperature sensor. There was a case where workability at the time of removing was deteriorated.

  The main purpose of the electric motor apparatus of the present invention is to improve workability when the temperature sensor is removed together with a cable or the like.

  In order to achieve the above-mentioned main object, the electric motor device structure of the present invention has adopted the following means.

The electric motor device of the present invention is
An electric motor housed in a case, a cable connecting a temperature sensor attached to a predetermined part of the electric motor and a connector attached to a device outside the case, and a terminal block fixed to a boundary inside and outside the case In the electric motor device,
The terminal block has a communication hole that communicates the inside and outside of the case,
In the cable, a sealing member capable of sealing the communication hole is attached to an outer peripheral surface of one part in the length direction, and the cable is attached to the terminal block in a state where the communication hole is sealed by the sealing member. Installed,
The communication hole is formed so that at least one of the temperature sensor and the connector can pass therethrough,
It is characterized by that.

  In the electric motor apparatus according to the present invention, the terminal block fixed to the boundary inside and outside the case has a communication hole communicating between the inside and outside of the case, and a temperature sensor attached to a predetermined part of the electric motor housed in the case and a device outside the case In the cable connecting the connector attached to the connector, a sealing member capable of sealing the communication hole is attached to the outer peripheral surface of one part in the length direction, and the communication hole is sealed by the sealing member. It is attached to the terminal block, and the communication hole is formed so that at least one of the temperature sensor and the connector can pass therethrough. Therefore, when the temperature sensor is removed together with the cable and the connector for replacement or inspection, the temperature sensor or the connector can pass through the communication hole by removing the sealing member from the communication hole. The temperature sensor can be removed together with the connector and cable. As a result, workability when removing the temperature sensor together with the cable or the like can be improved. Here, as the temperature sensor, for example, a temperature sensor such as a thermistor or a thermocouple and a protective member that covers the temperature sensor can be used.

  In such an electric motor device, the temperature sensor may be formed in a cylindrical shape, and the communication hole may be formed in a cylindrical shape having a larger hole diameter than the outer diameter of the temperature sensor.

It is a schematic block diagram which shows a part of motor 12, the cable 32, and the terminal block 40 which comprise the electric motor apparatus 10 as one Example of this invention. FIG. 3 is a configuration diagram showing an outline of the configuration of a terminal block 40. It is a schematic block diagram which shows some motors 12, the cables 32a and 32b, and the terminal block 49 of a comparative example.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a schematic configuration diagram showing a part of a motor 12, a cable 32, and a terminal block 40 constituting an electric motor device 10 as an embodiment of the present invention. FIG. 2 is a schematic configuration diagram of the terminal block 40. FIG. The electric motor device 10 of the embodiment is for measuring the temperature of a motor 12 configured as a synchronous generator motor such as a traveling motor or a generator motor mounted in an engine room such as an electric vehicle or a hybrid vehicle. .

  The motor 12 includes a rotor and a stator 14 (not shown). For example, the motor 12 has a transmission case together with a gear mechanism such as a planetary gear that transmits traveling power to the drive shaft and a differential gear that transmits power transmitted to the drive shaft to the axle. It is mounted in the engine room in the front part of the vehicle in a state of being housed in a metal case 11. The motor 12 is driven by an inverter (not shown), and this inverter is controlled by an electronic control unit (not shown) mounted on the vehicle. Further, a coil (not shown) is wound around the stator 14 to form a coil end portion at an axial end portion, and one portion of the coil end portion is defined as a temperature measuring portion 16 to which the temperature sensor 20 is attached. By using it, the temperature of the stator 14 of the motor 12 is measured. In the embodiment, the temperature measuring portion 16 is a conductor as a part of a coil drawn from the coil end portion to the outer peripheral portion of the stator 14. The stator 14 is cooled by applying hydraulic oil used in a lubricating mechanism (not shown) that lubricates the gear mechanism in the case 11 from above, for example, by a scraping mechanism.

  In the terminal block 40, terminals of a three-phase lead wire terminal (not shown) drawn from the stator 14 of the motor 12 are attached to the inside of the case 11, and terminals of a three-phase cable terminal from an inverter (not shown) are connected to the terminal block 40. It is attached to the outside of the case 11 and is formed as a molded product made of, for example, resin including a conductor that electrically connects the inverter and the motor 12. It is fixed. In FIG. 1, the motor 12 side (the lower side in FIG. 1) from the case 11 is inside the case 11 and is vertically below when the case 11 is mounted in the engine room. Furthermore, as shown in FIG. 2, a cylindrical communication hole (through hole) 42 that communicates the inside and the outside of the case 11 is formed in a part of the terminal block 40.

  The temperature sensor 20 is formed in a cylindrical shape by a temperature measuring element as a thermistor (not shown) and a resin protective member that covers the temperature measuring element, and is attached to the temperature measuring portion 16 of the stator 14. In addition, as a temperature measuring element, you may use other types, such as a thermocouple, for example. At the other end of the cable 32 to which the temperature sensor 20 is attached at one end, a substantially rectangular parallelepiped connector 30 connected to the above-described electronic control unit mounted in the engine room outside the case 11 is attached. A rubber plug 38 as a sealing member for sealing the communication hole 42 of the terminal block 40 is attached to one portion in the length direction of the cable 32. Therefore, the connection between the temperature sensor 20 and the connector 30 is made by the cable 32 in a state where the communication hole 42 is sealed by the rubber plug 38 as a sealing member. By sealing the communication hole 42 with the rubber plug 38 in this way, hydraulic oil in the case 11 leaks to the outside of the case 11, and moisture such as rain water outside the case 11 (in the engine room) enters the inside of the case 11. Can be prevented.

  Here, the relationship between the temperature sensor 20 and the communication hole 42 will be described. The temperature sensor 20 is formed in a cylindrical shape having a predetermined outer diameter Ds (for example, 8 mm or 10 mm), and a cable 32 extends from the center of one bottom surface. The communication hole 42 of the terminal block 40 has a cylindrical shape with a hole diameter Dh (for example, 12 mm or 14 mm) larger than the outer diameter Ds of the temperature sensor 20, and both bottom surfaces face the inside of the case 11 and the outside of the terminal block 40. It is formed as follows. Therefore, the temperature sensor 20 can pass through the communication hole 42. Further, the rubber plug 38 attached to the cable 32 is formed in a cylindrical shape slightly larger than the communication hole 42, and can be sealed by being press-fitted into the communication hole 42. In the embodiment, the connector 30 has a substantially square shape in which each side of the surface to which the other end of the cable 32 is attached has a length (for example, 15 mm or 17 mm) Dc larger than the hole diameter Dh of the communication hole 42. It is formed in a rectangular parallelepiped shape and cannot pass through the communication hole 42.

  Next, a procedure for attaching the temperature sensor 20 together with the cable 32 and the connector 30 will be described. First, the cable 32 to which the temperature sensor 20 and the connector 30 are attached at one end and the other end and the rubber plug 38 is attached is prepared in advance, and the rubber plug 38 is passed through the communication hole 42 of the terminal block 40 through the temperature sensor 20. The cable 32 is attached to the terminal block 40 by sealing the communication hole 42. Subsequently, the terminal block 40 is fixed to the case 11 and the motor 12 is stored in the case 11. And while attaching the temperature sensor 20 to the temperature measurement part 16 of the coil of the stator 14, the connector 30 is connected to the electronic control unit which is not shown in figure, and the case 11 is closed.

  Next, a procedure for exchanging the temperature sensor 20 together with the cable 32 and the connector 30 will be described. For example, when the detection value of the temperature sensor 20 input to the electronic control unit is an abnormal value or when the detection value of the temperature sensor 20 is not input to the electronic control unit. It can be considered that it is determined that there is a possibility that an abnormality such as a failure in the cable 32, a break in the cable 32, or a failure in the connector 30 has occurred. First, the connector 30 is removed from the electronic control unit, and the case 11 is opened to remove the temperature sensor 20 from the temperature measuring portion 16 of the coil of the stator 14. Subsequently, the rubber plug 38 is removed from the communication hole 42 of the terminal block 40 toward the outside of the case 11, and the temperature sensor 20 is passed from the communication hole 42 to the outside of the case 11. Then, the cable 32 having the temperature sensor 20 and the connector 30 attached to one end and the other end and having the rubber plug 38 attached thereto is prepared in advance in the same manner as in the attachment procedure described above. At the same time, the temperature sensor 20 is attached to the temperature measuring portion 16 of the coil of the stator 14, the connector 30 is connected to the electronic control unit, and the case 11 is closed.

  As described above, in the electric motor device 10 of the embodiment, the communication hole 42 is formed in the terminal block 40 so that the hole diameter Dh of the cylindrical communication hole 42 is larger than the outer diameter Ds of the cylindrical temperature sensor 20. That is, the communication hole 42 is formed so that the temperature sensor 20 can pass therethrough. Therefore, unlike the case where the communication hole 42 is not formed to allow the temperature sensor 20 to pass therethrough, the temperature sensor 20 can be exchanged together with the cable 32 and the connector 30 without removing the terminal block 40 from the case 11. Can be removed. As a result, workability when removing the temperature sensor 20 together with the cable 32 and the connector 30 can be improved.

  Here, in place of the embodiment in which the communication hole 42 is formed in the terminal block 40 and the communication hole 42 is sealed with the rubber plug 38 attached to the cable 32, the cable 32 is attached to the terminal block 40. As shown, the relay connector 36 is attached to the terminal block 49, the cable 32a from the temperature sensor 20 is connected to the relay connector 36, and the cable 32b from the connector 30 is connected to the relay connector 36, thereby connecting the cables 32a and 32b to the terminals. Consider a comparative example attached to the base 49. In the comparative example, when it becomes necessary to replace the temperature sensor 20 together with the cable 32 and the connector 30, a failure may occur in the relay connector 36 that is responsible for electrical connection of the detected value of the temperature sensor 20 to the electronic control unit. Therefore, it is necessary to remove the terminal block 49 from the case 11 as in the case where the communication hole 42 is not formed so as to allow the temperature sensor 20 to pass through, and together with the temperature sensor 20, the cables 32a and 32b, and the connector 30. The terminal block 49 needs to be replaced. On the other hand, in the embodiment, the temperature sensor 20 can be removed together with the cable 32 and the connector 30 for replacement without removing the terminal block 40 from the case 11, and the relay connector 36 can be reduced. Furthermore, it is not necessary to replace the terminal block 40 when replacing the temperature sensor 20 or the like. As a result, workability when removing the temperature sensor 20 together with the cable 32 and the connector 30 can be improved, the number of parts can be reduced, and replacement parts required for replacing the temperature sensor 20 and the like can be reduced and replaced. It is possible to reduce the man-hours for mounting the parts.

  In the electric motor apparatus 10 of the embodiment described above, the terminal block 40 fixed to the inner and outer boundaries of the case 11 has a communication hole 42 that communicates between the inside and outside of the case 11, and the stator 14 of the motor 12 housed in the case 11. The cable 32 that connects the temperature sensor 20 attached to the temperature measurement part 16 and the connector 30 attached to the electronic control unit outside the case 11 can seal the communication hole 42 on the outer peripheral surface of one part in the length direction. A rubber plug 38 as a sealing member is attached, and the communication hole 42 is attached to the terminal block 40 in a state of being sealed by the rubber plug 38, and the communication hole 42 is formed so that the temperature sensor 20 can pass therethrough. Has been. Therefore, when the temperature sensor 20 is removed together with the cable 32 and the connector 30 for replacement or the like, the temperature sensor 20 can pass through the communication hole 42 by removing the rubber plug 38 from the communication hole 42. The temperature sensor 20 can be removed together with the connector 30 and the cable 32 without being removed from the case 11. As a result, workability when removing the temperature sensor 20 together with the cable 32 and the like can be improved.

  In the electric motor apparatus 10 of the embodiment, the communication hole 42 is formed in a cylindrical shape having a hole diameter Dh larger than the outer diameter Ds of the cylindrical temperature sensor 20, but the temperature sensor 20 can pass through the communication hole 42. For example, if the axial cross section of the temperature sensor is rectangular, the communication hole may be formed in a rectangular parallelepiped shape having a rectangular cross section slightly larger than the rectangular shape, or the axial direction of the temperature sensor 20 When the cross section is elliptical, the communication hole 42 may be formed to have an elliptical cross section similar to the ellipse. The communication hole 42 may be formed in a rectangular parallelepiped shape through which the cylindrical temperature sensor 20 can pass.

  In the electric motor apparatus 10 of the embodiment, the communication hole 42 is formed so that the temperature sensor 20 can pass therethrough, but instead of or in addition to the temperature sensor 20, the communication hole 42 is formed so that the connector 30 can pass therethrough. It is good.

  In the electric motor apparatus 10 according to the embodiment, the rubber plug 38 is used as a sealing member for sealing the communication hole 42 of the terminal block 40. However, in addition to the rubber plug 38, the rubber plug 38 is removed from the communication hole 42. For example, a circular retaining part made of resin and locked to the case 11 may be attached to the cylindrical bottom surface of the rubber plug 38 on the outside (or inside) side of the case 11.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the case 11 corresponds to a “case”, the motor 12 corresponds to a “motor”, the temperature sensor 20 corresponds to a “temperature sensor”, the connector 30 corresponds to a “connector”, and the terminal block 40 The communication hole 42 corresponds to a “communication hole”, the cable 32 corresponds to a “cable”, and the rubber plug 38 corresponds to a “sealing member”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of electric motor devices.

  DESCRIPTION OF SYMBOLS 10 Electric motor apparatus, 11 Case, 12 Motor, 14 Stator, 16 Temperature measuring part, 20 Temperature sensor, 30, 34a, 34b Connector, 32, 32a, 32b Cable, 36 Relay connector, 38 Rubber plug, 40, 49 Terminal block, 42 Communication hole.

Claims (1)

An electric motor housed in a case, a cable connecting a temperature sensor attached to a predetermined part of the electric motor and a connector attached to a device outside the case, and a terminal block fixed to a boundary inside and outside the case In the electric motor device,
The terminal block has a communication hole that communicates the inside and outside of the case,
In the cable, a sealing member capable of sealing the communication hole is attached to an outer peripheral surface of one part in the length direction, and the cable is attached to the terminal block in a state where the communication hole is sealed by the sealing member. Installed,
The communication hole is formed so that at least one of the temperature sensor and the connector can pass therethrough,
An electric motor device characterized by that.

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