relay

Abstract

The present invention provides a relay that can reduce the sound pressure in a specific frequency range within the noise generated when opening and closing contacts. [Solution] The device comprises fixed members 1a, 1b, a movable member 2, a substantially cylindrical magnetic core 5, a shaft 6 provided to be axially movable within a through-hole in the magnetic core 5, a coil 7 that drives the shaft 6 away from the movable member 2, a first spring 3 that biases the movable member 2 so that the movable contacts 21a, 21b contact the fixed contacts 11a, 11b, and a second spring 8 that biases the shaft 6 toward the movable member 2. When current is supplied to the coil 7, collisions between the movable contacts 21a, 21b and the fixed contacts 11a, 11b, and collisions between the first flange portion 61 and the magnetic core 5 occur at intervals. When current is stopped from the coil 7, collisions between the shaft 6 and the movable member 2, and collisions between the second flange portion 61 and the magnetic core 5 occur at intervals.

Description

Technical Field

[0001] The present invention relates to a relay.

Background Art

[0002] Hybrid vehicles and electric vehicles are equipped with a battery pack for storing the electric power supplied to an electric motor as a driving power source. And, an SMR (System Main Relay) for switching the input and cutoff of high voltage from the battery to the high voltage system is mounted on the case of the battery pack. Therefore, due to the vibration of the SMR generated by the impact when opening and closing the contacts, the vibration of the case of the battery pack is excited and generates sound, and the noise may be heard by the passengers in the vehicle interior.

[0003] Patent Document 1 discloses a battery pack in which a relay unit is fixed to the inner surface of the case via a shock absorbing member in order to suppress the transmission of the vibration of the relay when opening and closing the contacts to the case of the battery pack.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the method of suppressing the transmission of vibration with a shock absorbing member as in the battery pack disclosed in Patent Document 1, it is difficult to control the frequency region for reducing the sound pressure, so it is difficult to reduce the frequency region where the sound pressure is particularly high among the noises. Furthermore, since there are many sheet metal-shaped parts in the sound generating part of the battery pack, it is difficult to reduce the noise by improving the shape of the battery pack so that the vibration mode changes. Therefore, it is necessary to reduce the noise generated by the opening and closing of the contacts of the relay by improving the structure of the relay.

[0006] Therefore, the present invention aims to provide a relay that can reduce the sound pressure in a specific frequency range within the noise generated when opening and closing contacts. [Means for solving the problem]

[0007] The relay according to the present invention comprises a fixed member having a fixed contact, a movable member having a movable contact facing the fixed contact, a substantially cylindrical magnetic core with a through hole formed in its radial center that penetrates axially, a shaft having at least a portion of the through hole and being movable in the axial direction to a position that contacts the movable member, a coil that generates a magnetic force that moves the shaft away from the movable member when energized, a first spring that biases the movable member in the direction that the movable contact contacts the fixed contact, and a second spring that biases the shaft toward the movable member, wherein when the coil is not energized, the shaft biased by the second spring pushes the movable member, causing the movable contact to contact the fixed contact. A relay that maintains a state of separation, and when the coil is energized, the shaft is separated from the movable member by the magnetic force generated by the coil, and the movable contact is maintained in contact with the fixed contact by the biasing force of the first spring, wherein the shaft comprises a first flange portion and a second flange portion that protrude radially outward, and when energization is started from a state where the coil is not energized, a collision in which the movable contact comes into contact with the fixed contact and a collision in which the first flange portion comes into contact with the magnetic core occur at time intervals, and when energization is stopped from a state where the coil is energized, a collision in which the shaft comes into contact with the movable member and a collision in which the second flange portion comes into contact with the magnetic core occur at time intervals. [Effects of the Invention]

[0008] The present invention can provide a relay that can reduce the sound pressure in a specific frequency range within the noise generated when opening and closing contacts. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows the state in which the coil of the relay according to an embodiment of the present invention is not energized. [Figure 2] This figure shows the state when the first collision occurs when the coil of the relay in this embodiment is energized. [Figure 3] This diagram shows the state of the relay coil in this embodiment while it is energized. [Figure 4] This figure shows the state when the first collision occurs after the current to the relay coil of this embodiment is stopped. [Figure 5] This figure shows the relay shaft of this embodiment in a disassembled state. [Modes for carrying out the invention]

[0010] The relay 10 of this embodiment will be described below with reference to Figures 1 to 5. The relay 10 is a normally open type. As shown in Figure 1, the relay 10 comprises a fixed member 1a having a fixed contact 11a, a fixed member 1b having a fixed contact 11b, and a movable member 2 having movable contacts 21a and 21b. The movable member 2 is arranged such that the movable contact 21a faces the fixed contact 11a and the movable contact 21b faces the fixed contact 11b, and is provided to be movable in the vertical direction of Figure 1. When the movable member 2 moves downward in Figure 1, the movable contact 21a comes into contact with the fixed contact 11a, and the movable contact 21b comes into contact with the fixed contact 11b. Then, when the movable member 2 moves upward in Figure 1, the movable contact 21a moves away from the fixed contact 11a, and the movable contact 21b moves away from the fixed contact 11b. The relay 10 includes a first spring 3 that biases the movable member 2 in the direction (downward in Figure 1) where the movable contact 21a contacts the fixed contact 11a and the movable contact 21b contacts the fixed contact 11b. One end of the first spring 3 is connected to the movable member 2 and the other end is connected to the case 4 of the relay 10.

[0011] The relay 10 comprises a substantially cylindrical magnetic core 5 with a through-hole formed in its radial center that penetrates axially (up and down in Figure 1), a substantially cylindrical shaft 6 that is partially positioned within the through-hole of the magnetic core 5 and is movable in the axial direction, and a coil 7 that generates a magnetic force that moves the shaft 6 away from the movable member 2 (downward in Figure 1) when energized. The coil 7 is positioned radially outward of the magnetic core 5. The magnetic core 5 has a protruding portion 51 that protrudes radially inward from its radially inner surface. The shaft 6 has a first flange portion 61 and a second flange portion 62 that protrude radially outward. The shaft 6 is provided to be movable to a position where its tip contacts the movable member 2. The relay 10 includes a second spring 8 that biases the shaft 6 toward the movable member 2 (upward in Figure 1). One end of the second spring 8 is connected to the shaft 6, and the other end is connected to the case 4 of the relay 10.

[0012] When the coil 7 is not energized, the relay 10 maintains a state where the movable contact 21a is separated from the fixed contact 11a and the movable contact 21b is separated from the fixed contact 11b, as shown in Figure 1, because the shaft 6, biased by the second spring 8, pushes the movable member 2 upward in the direction shown in Figure 1.

[0013] Then, when power is turned on to the coil 7 from a state where it is not energized, the magnetic force generated by the coil 7 causes the shaft 6 to move downward in Figure 1. As a result, as shown in Figure 2, after the first collision in which the movable contact 21a contacts the fixed contact 11a and the movable contact 21b contacts the fixed contact 11b, a second collision occurs after a time interval ΔT1, as shown in Figure 3, in which the first flange portion 61 of the shaft 6 contacts the protruding portion 51 of the magnetic core 5. While the coil 7 is energized, as shown in Figure 3, the magnetic force generated by the coil 7 causes the shaft 6 to move away from the movable member 2, and the biasing force of the first spring 3 maintains the state in which the movable contact 21a contacts the fixed contact 11a and the movable contact 21b contacts the fixed contact 11b.

[0014] Since relay 10 generates two collisions when closing its contacts, the sound pressure in a specific frequency range of noise generated when closing the contacts can be reduced by appropriately setting the time interval ΔT1 between the first and second collisions. For example, if the interval ΔT1 is set to 0.001 seconds, the vibrations generated by the second collision overlap with the frequency components below 1000 Hz of the vibrations generated by the first collision, thus reducing the sound pressure in the frequency range below 1000 Hz of the noise generated by the first collision. The interval ΔT1 is determined by the shape of the magnetic core 5 and the position where the first flange portion 61 is provided on the shaft 6. Therefore, by appropriately setting the shape of the magnetic core 5 and the position where the first flange portion 61 is provided on the shaft 6, relay 10 can select a frequency range in which the sound pressure of noise generated when closing the contacts is reduced.

[0015] When the relay 10 is de-energized from the state shown in Figure 3, where the coil 7 is energized, the magnetic force pulling the shaft 6 downwards in Figure 3 disappears, causing the shaft 6 to move upwards in Figure 3 due to the biasing force of the second spring 8. As a result, after the first collision in which the tip of the shaft 6 contacts the movable member 2, as shown in Figure 4, a second collision occurs after a time interval ΔT2, in which the second flange portion 62 of the shaft 6 contacts the protruding portion 51 of the magnetic core 5, as shown in Figure 1.

[0016] Since relay 10 generates two collisions when opening its contacts, the sound pressure in a specific frequency range of noise generated when the contacts are opened can be reduced by appropriately setting the time interval ΔT2 between the first and second collisions. The interval ΔT2 is determined by the shape of the magnetic core 5 and the position where the second flange portion 62 is provided on the shaft 6. Therefore, by appropriately setting the shape of the magnetic core 5 and the position where the second flange portion 62 is provided on the shaft 6, relay 10 can select a frequency range in which the sound pressure of noise generated when the contacts are closed is reduced.

[0017] As shown in Figure 5, the shaft 6 can be divided into a first shaft 6a and a second shaft 6b. The first shaft 6a is provided with a male threaded portion 63. The second shaft 6b is provided with a female threaded portion 64. By screwing the male threaded portion 63 of the first shaft 6a into the female threaded portion 64 of the second shaft 6b, the first shaft 6a can be connected to the second shaft 6b to complete the shaft 6. When the shaft 6 is connected to the second shaft 6b, the first flange portion 61 or the second flange portion 62 interferes with the magnetic core 5, and therefore it cannot be inserted into the through hole of the magnetic core 5. Therefore, when inserting the shaft 6 into the through-hole of the magnetic core 5, the first shaft 6a is detached from the second shaft 6b, and the male threaded portion 63 side of the first shaft 6a and the female threaded portion 64 side of the second shaft 6b are inserted into the through-hole of the magnetic core 5. After that, the first shaft 6a is connected to the second shaft 6b inside the through-hole of the magnetic core 5. [Explanation of symbols]

[0018] 1a,1b Fixed member, 2 Movable member, 3 First spring, 4 Case, 5 Magnetic core, 6 Shaft, 6a First shaft, 6b Second shaft, 7 Coil, 8 Second spring, 10 Relay, 11a,11b Fixed contact, 21a,22b Movable contact, 51 Protruding part, 61 First flange part, 62 Second flange part, 63 Male threaded part, 64 Female threaded part.

Claims

[Claim 1] A fixing member having a fixed contact point, A movable member having a movable contact opposite the fixed contact, A substantially cylindrical magnetic core with a through-hole that penetrates axially formed in the radial center, A shaft, at least a portion of which is positioned within the through-hole and which is movable in the axial direction to a position in contact with the movable member, A coil that generates a magnetic force that moves the shaft away from the movable member when power is applied, A first spring biases the movable member in the direction in which the movable contact contacts the fixed contact, A second spring biases the shaft toward the movable member, When the coil is not energized, the shaft biased by the second spring pushes the movable member, thereby maintaining the movable contact away from the fixed contact. While the coil is energized, the magnetic force generated by the coil causes the shaft to separate from the movable member, and the biasing force of the first spring maintains the state in which the movable contact is in contact with the fixed contact, in a relay, The shaft comprises a first flange portion and a second flange portion that protrude radially outward, When current is applied to the coil from a state where it is not energized, collisions occur at time intervals: the movable contact comes into contact with the fixed contact, and the first flange comes into contact with the magnetic core. A relay characterized in that when the power supply to the coil is stopped from a state in which power is supplied, a collision occurs in which the shaft comes into contact with the movable member, and a collision occurs in which the second flange portion comes into contact with the magnetic core, with a time interval between them.

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