JP7491086B2 - Hydraulic Pressure Control Device - Google Patents

Description

The present invention relates to a hydraulic control device.

The hydraulic control device includes, for example, an electric motor, a pump driven by the electric motor, and a board connected to the electric motor. The electric motor and the board are connected via a bus bar. Because the hydraulic control device is a device that handles fluid, it is necessary to ensure sealing of the board. For example, JP 2014-61755 A discloses a hydraulic control device in which a thermosetting seal member is disposed between an insertion hole and a motor post.

JP 2014-61755 A

However, in the above configuration, if fluid enters the electric motor via, for example, a pump, the fluid in the electric motor may leak out onto the board through the gap between the bus bar and the covering member. The motor terminal, which is the tip of the bus bar, is connected to the board or the board's connector, and the leaked fluid may reach the board via the motor terminal. In addition, in the above hydraulic control device, time is required to harden the thermosetting sealing member during the manufacture of the device, which increases the takt time.

The object of the present invention is to provide a hydraulic control device that can improve the sealing performance near the motor terminals while suppressing an increase in tact time.

The hydraulic control device of the present invention comprises an electric motor having a motor main body, a motor terminal for supplying power to the motor main body, a conductive portion connecting the motor terminal and the motor main body, and a covering portion covering the conductive portion, a housing having an accommodating portion formed in the shape of a through hole having one end opening which is an opening on the motor main body side and another end opening which is an opening on the motor terminal side and accommodating the covering portion, and an engaging portion formed on the other end opening side of the accommodating portion relative to the covering portion, a guide member arranged between the engaging portion and the covering portion and whose movement to the outside of the housing is restricted by the engaging portion, and a rubber member arranged between the guide member and the covering portion, wherein the guide member has a guide insertion hole through which the motor terminal is inserted, and the rubber member has a rubber insertion hole through which the motor terminal is inserted, and the rubber member is arranged in a state in which it is pressed against the guide member and elastically deformed so that the rubber insertion hole is closed by an axial force generated by assembling the electric motor to the housing and pressing the covering portion toward the other end opening of the accommodating portion.

According to the present invention, the rubber member, which is elastically deformed so as to close the rubber insertion hole, seals between the covering portion and the guide member. Therefore, even if fluid that has entered the motor main body attempts to leak out toward the motor terminal side from the gap between the covering portion and the conductive portion, the rubber member prevents the fluid from leaking out. Furthermore, according to the present invention, in manufacturing, it is only necessary to place the guide member and the rubber member between the covering portion and the engaging portion of the housing, and no time is required for the sealant to harden. In this way, according to the present invention, it is possible to improve the sealing performance near the motor terminal while suppressing an increase in tact time.

1 is a configuration diagram of a hydraulic pressure control device according to an embodiment of the present invention; FIG. 2 is a front view of the guide member of the present embodiment as viewed in the axial direction. FIG. 2 is a front view of the rubber member of the embodiment as viewed in the axial direction. 4 is a conceptual diagram (cross-sectional view) showing the guide member and the rubber member before axial force is applied (immediately before the electric motor is assembled) in the embodiment. FIG. 11 is a conceptual diagram (cross-sectional view) showing the guide member and the rubber member after axial force has been applied (after the electric motor is assembled) in the embodiment. FIG. 13 is a conceptual diagram (cross-sectional view) illustrating a guide member and a rubber member before an axial force is applied in a first modified example of the embodiment. FIG. FIG. 11 is a conceptual diagram (cross-sectional view) showing a guide member and a rubber member after an axial force is applied in a second modified example of the embodiment.

Below, an embodiment of the present invention will be described with reference to the drawings. Each drawing used in the description is a conceptual diagram. In this embodiment, a specific configuration will be described using as an example a hydraulic control device (e.g., an actuator) used in a vehicle brake system.

As shown in FIG. 1, the hydraulic control device 1 of this embodiment includes an electric motor 2, a housing 3, a guide member 4, and a rubber member 5. The electric motor 2 is, for example, a brush motor. The electric motor 2 includes a motor body 21, a motor terminal 22, a conductive portion 23, and a covering portion 24.

The motor main body 21 includes an output shaft 211, a rotor (not shown), and a stator (not shown). The motor terminal 22 is a terminal portion for supplying power to the motor main body 21. The conductive portion 23 is a conductor portion that connects the motor terminal 22 and the motor main body 21. The covering portion 24 is a portion that covers the conductive portion 23. The covering portion 24 is made of resin (molded resin). The covering portion 24 maintains the wiring shape and makes it easy to insert the wiring into the housing portion 31. The covering portion 24 performs a guide function during assembly.

More specifically, the motor terminal 22 and the conductive portion 23 are configured as a bus bar 201 connected to the motor main body 21. That is, the tip portion of the bus bar 201 exposed from the covering portion 24 (the end portion on the substrate 9 side described later) is the motor terminal 22, and the remaining portion is the conductive portion 23. Multiple bus bars 201 (three in this example) are arranged within the covering portion 24. The bus bar 201 is formed in a plate shape. The motor terminal 22, the conductive portion 23, and the covering portion 24 configure the wiring unit 20.

The housing 3 is a metal block. A hydraulic circuit is formed in the housing 3, and the electric motor 2, the pressure regulator 6 driven by the electric motor 2, and a solenoid valve (not shown) are arranged in the housing 3. The pressure regulator 6 in this embodiment is a pump.

The electric motor 2 is disposed at one end of the housing 3, and a circuit board 9 is disposed at the other end of the housing 3. The circuit board 9 includes a CPU, memory, etc., and constitutes a brake ECU that controls the electric motor 2 and the solenoid valves. The motor terminals 22 are connected to the circuit board 9 via a connector 91. Electric power is supplied to the motor main body 21 via the circuit board 9 and the wiring unit 20.

The housing 3 has a storage section 31 and an engagement section 32. The storage section 31 is a portion that stores the covering section 24. In other words, a part of the wiring unit 20 is disposed in the storage section 31. More specifically, the storage section 31 is a through hole formed in the housing 3. The storage section 31 extends from one end face to the other end face of the housing 3. The motor main body section 21 is disposed near the opening 311 on one end side of the storage section 31, and the connector 91 is disposed near the opening 312 on the other end side of the storage section 31 (corresponding to "opening").

Hereinafter, the extension direction of the storage section 31 is referred to as the "axial direction." The direction from the other end opening 312 toward the one end opening 311 is referred to as one axial direction, and the direction from the one end opening 311 toward the other end opening 312 is referred to as the other axial direction. In this embodiment, the axial direction and the extension direction of the output shaft 211 are parallel.

The engaging portion 32 is formed closer to the other end opening 312 of the storage portion 31 (substrate 9 side) than the covering portion 24. The engaging portion 32 protrudes from the partition surface (inner peripheral surface) that defines the storage portion 31. In this embodiment, the engaging portion 32 is annular and formed at the other end opening 312. The engaging portion 32 is configured to prevent the guide member 4 from going out of the housing 3 from the other end opening 312, that is, to restrict the movement of the guide member 4 in the other axial direction. The area of the opening formed by the engaging portion 32 is smaller than the maximum area of the cross section of the guide member 4 perpendicular to the axial direction.

The guide member 4 is disposed between the engaging portion 32 and the covering portion 24, and is a member whose movement to the outside of the housing 3 is restricted by the engaging portion 32 as described above. The guide member 4 is, for example, a plate-shaped resin member. The guide member 4 is formed in a shape that matches the compartment shape of the storage portion 31 so as to close the other end side opening 312 of the storage portion 31. When the guide member 4 attempts to move in the other axial direction, the edge of the guide member 4 abuts against the engaging portion 32, and the movement of the guide member 4 is restricted.

As shown in Figures 2, 4, and 5, the guide member 4 is formed with a guide insertion hole 41 through which the motor terminal 22 is inserted. The guide insertion hole 41 is a through hole formed to match the shape of the motor terminal 22 so that the gap between the motor terminal 22 and the guide member 4 is minimized. Multiple guide insertion holes 41 (three in this example) are formed to match the number of motor terminals 22.

The rubber member 5 is disposed between the guide member 4 and the covering portion 24. Like the guide member 4, the rubber member 5 is formed in a shape that matches the shape of the storage portion 31 so as to close the other end opening 312 of the storage portion 31. The end face of the rubber member 5 and the end face of the guide member 4 are in full contact with each other.

As shown in Figures 3 to 5, the rubber member 5 has a rubber insertion hole 51 through which the motor terminal 22 is inserted. A plurality of rubber insertion holes 51 (three in this example) are formed to match the number of motor terminals 22. The rubber insertion hole 51 is a through hole that opens larger than the guide insertion hole 41. In other words, the opening area of the rubber insertion hole 51 is larger than the opening area of the guide insertion hole 41.

The rubber member 5 is pressed against the guide member 4 by an axial force that presses the covering portion 24 toward the other end opening 312 of the accommodation portion 31, which is generated by assembling the electric motor 2 into the housing 3, and is arranged in a state of elastic deformation so that the rubber insertion hole 51 is closed. The electric motor 2 is fixed, for example, by screws to one axial end face of the housing 3. The motor main body 21 and the wiring unit 20 are fixed in position relative to each other, and the wiring unit 20 also moves in the other axial direction in response to the movement of the motor main body 21 in the other axial direction. The axial force can be said to be, for example, the force with which the motor main body 21 presses against the covering portion 24.

The housing 3 and wiring unit 20 are designed so that the covering portion 24 presses against the rubber member 5 when the electric motor 2 is assembled to the housing 3. For example, the axial length of the covering portion 24 disposed in the accommodating portion 31 is greater than the axial length from the one end opening 311 to one axial end face of the rubber member 5 before the electric motor 2 is assembled to the housing 3. As a result, when the electric motor 2 is assembled to the housing 3, the rubber member 5 is pressed against the guide member 4 by the other axial end face of the covering portion 24, and is elastically deformed.

The rubber member 5 is sandwiched between the guide member 4 and the covering portion 24, and elastically deforms so that its axial length decreases and it bulges in a direction perpendicular to the axial direction. The gap in the rubber insertion hole 51 formed before the application of axial force to the rubber member 5 (see FIG. 4) is filled by the rubber member 5 after the application of axial force (see FIG. 5). In addition, the outer peripheral surface of the rubber member 5 after the application of axial force presses against the housing 3 (the partition surface of the accommodating portion 31). The rubber member 5 is placed in the accommodating portion 31 while pressing against the motor terminal 22 and the housing 3.

(Effects of this embodiment)
According to this embodiment, the rubber member 5, which is elastically deformed so as to close the rubber insertion hole 51, seals the gap between the covering portion 24 and the guide member 4. Therefore, even if the fluid that has entered the motor main body 21 attempts to leak out to the motor terminal 22 side (substrate 9 side) through the gap between the covering portion 24 and the conductive portion 23, the leakage of the fluid is suppressed by the rubber member 5. Furthermore, the arrangement of the guide member 4 makes it easier to apply an axial force to the rubber member 5 overall and uniformly, which is preferable in terms of sealing properties and durability.

In addition, due to the elastic deformation of the rubber member 5, the outer peripheral surface of the rubber member 5 presses against the housing 3 (the partition surface of the storage section 31). This also improves the sealing performance between the outer peripheral surface of the rubber member 5 and the housing 3. Therefore, the rubber member 5 exhibits an excellent sealing function against the fluid that passes through the gap between the covering section 24 and the partition surface of the storage section 31 from the motor main body section 21.

In addition, according to this embodiment, in manufacturing, it is only necessary to place the guide member 4 and the rubber member 5 between the covering portion 24 and the engagement portion 32, and no time is required for the sealant to harden. In this way, according to this embodiment, it is possible to improve the sealing performance near the motor terminal 22 (the other end opening 312) while suppressing an increase in tact time.

In addition, because the opening area of the rubber insertion hole 51 is larger than the opening area of the guide insertion hole 41, the work of inserting the motor terminal 22 into the rubber insertion hole 51 becomes easier. This configuration also prevents the pressing force on the motor terminal 22 from becoming too strong when elastically deformed, which is also favorable in terms of durability. In other words, this configuration is advantageous in terms of assembly workability and durability of the sealing member.

(First Modification)
6, a protrusion 52 that protrudes toward the motor terminal 22 may be formed on the partition surface (inner peripheral surface) of the rubber member 5 that defines the rubber insertion hole 51. With this configuration, the protrusion 52 can easily come into contact with the motor terminal 22, and when the rubber member 5 is elastically deformed by the axial force, the surface pressure that the rubber member 5 applies to the motor terminal 22 can be increased. In other words, the sealing performance can be improved.

The protrusion 52 is, for example, a texture provided on the rubber member 5. In the example of FIG. 6, the protrusion 52 is provided on the entire circumference of the partition surface of the rubber insertion hole 51. This makes it possible to more reliably improve the sealing performance. In addition, the outer peripheral surface of the rubber member 5 is also provided with a protrusion 52 (texture). This increases the surface pressure that the rubber member 5 applies to the housing 3 (the partition surface of the accommodating section 31). With this configuration, it is possible to improve not only the sealing performance of the outer peripheral surface of the motor terminal 22, but also the sealing performance of the outer peripheral surface of the rubber member 5.

In addition, if the motor terminal 22 is textured, even if the motor terminal 22 comes into contact with the texture during the operation of inserting the motor terminal 22 into the rubber insertion hole 51, the texture can be easily deformed while the motor terminal 22 is being inserted, and a decrease in workability can be suppressed. The protrusion 52 may be designed to come into contact with the motor terminal 22 before the axial force is applied to the rubber member 5. The protrusion 52 is designed so that the rubber member 5 comes into contact with the entire outer periphery of the motor terminal 22 at least after the axial force is applied.

(Second Modification)
As a second modified example, as shown in Fig. 7, the hydraulic control device 1 may include a spring 7 (here, a leaf spring) between the engaging portion 32 and the guide member 4, which presses the guide member 4 toward the rubber member 5. According to this configuration, the spring force of the spring 7 serves as a reaction force against the axial force. The axial force is a pressing force in the other axial direction, and the spring force of the spring 7 is a pressing force in one axial direction. Therefore, even if the axial force weakens due to, for example, aging, the spring force of the spring 7 complements it, and it is possible to suppress a decrease in the surface pressure of the rubber member 5 against the motor terminal 22.

The spring 7 in the example of FIG. 7 is an annular member formed so that the diameter becomes smaller in one axial direction. The other axial end of the spring 7, which is the small diameter portion, abuts against the guide member 4, and the one axial end, which is the large diameter portion, abuts against the engagement portion 32 and engages in the axial direction. Note that instead of the spring 7, for example, an annular rubber member harder than the rubber member 5 may be disposed. The rigidity of the elastic member disposed here (spring 7 or annular rubber member) is higher than the rigidity of the rubber member 5. Rigidity refers to the resistance to deformation in response to a pressing force, and is the pressing force required to reduce the unit length in the axial direction.

(others)
The present invention is not limited to the above embodiment and modified examples. For example, the pressure regulating device 6 is not limited to a pump, and may be an electric cylinder driven by the electric motor 2. The opening area of the rubber insertion hole 51 may be equal to or smaller than the opening area of the guide insertion hole 41. The smaller the opening area of the rubber insertion hole 51, the higher the sealing performance. The protruding portion 52 is not limited to the grain. The protruding portion 52 may protrude only to the flat portion of the motor terminal 22 (the upper and lower surfaces in FIG. 1) instead of the entire circumference of the rubber insertion hole 51. The electric motor 2 may be a brushless motor, and the wiring unit 20 may include a signal line of a rotation angle sensor.

1...hydraulic pressure control device, 2...electric motor, 21...motor main body, 22...motor terminal, 23...conductive part, 24...covering part, 3...housing, 31...accommodating part, 312...other end side opening (opening), 32...engagement part, 4...guide member, 41...guide insertion hole, 5...rubber member, 51...rubber insertion hole, 52...projection part, 7...spring.

Claims (4)

an electric motor having a motor body, a motor terminal for supplying electric power to the motor body, a conductive portion connecting the motor terminal and the motor body, and a covering portion covering the conductive portion;
a housing including an accommodating portion formed in a through hole shape having a one end opening which is an opening on the motor main body side and an other end opening which is an opening on the motor terminal side, the accommodating portion accommodating the covering portion, and an engaging portion formed on the other end opening side of the accommodating portion relative to the covering portion;
a guide member disposed between the engaging portion and the covering portion, the guide member being restricted in its movement toward an outside of the housing by the engaging portion;
a rubber member disposed between the guide member and the covering portion;
Equipped with
the guide member is formed with a guide insertion hole through which the motor terminal is inserted,
the rubber member is formed with a rubber insertion hole through which the motor terminal is inserted,
a hydraulic control device in which the rubber member is pressed against the guide member and is arranged in an elastically deformed state so as to close the rubber insertion hole by an axial force that presses the covering portion toward the other end opening of the accommodating portion, the axial force being generated by assembling the electric motor into the housing. The hydraulic control device according to claim 1, wherein a protrusion protruding toward the motor terminal is formed on the partition surface of the rubber member that defines the rubber insertion hole. The hydraulic control device according to claim 1 or 2, further comprising a spring between the engaging portion and the guide member that presses the guide member toward the rubber member. The hydraulic control device according to any one of claims 1 to 3, wherein the opening area of the rubber insertion hole is larger than the opening area of the guide insertion hole.

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