JPH087155Y2 - Vibration control structure of compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vibration damping structure for suppressing mechanical vibration of a compressor equipped with an electromagnetic clutch.

2. Description of the Related Art Conventionally, a compressor shown in FIG. 2 is known as a compressor equipped with an electromagnetic clutch (Japanese Patent Laid-Open No. 59-73637).

The compressor 1 shown here is for a car cooler mounted on a vehicle, and an electromagnetic clutch 2 for transmitting and releasing a driving force from an engine (not shown) is mounted on one side thereof. This electromagnetic clutch 2 includes a compressor 1 and a drive shaft 1a for the compressor.
A cylindrical projection 10 that encloses and projects, a clutch rotor 20 that is rotatably supported on the outer surface of the cylindrical projection 10, and a core that holds the exciting coil 31 stationary and fixed in the space inside the clutch rotor 20. The clutch hub 50 includes a portion 30, a ring-shaped suction plate 40 arranged on the end surface of the clutch rotor 20 with a predetermined gap, and a clutch hub 50 fixed to the end portion of the drive shaft 1a. The suction plate 40 and the suction plate 40 are connected by a leaf spring 60.

In the electromagnetic clutch 2 having such a configuration, when exciting power is supplied to the exciting coil 31, a flow of magnetic flux φ occurs as shown by an arrow in the figure, and the suction plate 40 resists the biasing force of the leaf spring 60. Is attracted to the friction surface portion 21 of the clutch rotor 20, and the suction plate 40 is rotated simultaneously with the clutch rotor 20. As a result, the rotational torque of the clutch rotor 20 is transmitted to the clutch hub 50 via the suction plate 40 and is transmitted to the drive shaft 1a.

When the exciting power to the exciting coil 31 is cut off, the flow of the magnetic flux φ disappears, the suction plate 40 is separated from the friction surface portion 21 by the biasing force of the leaf spring 60, and the transmission of the rotational torque to the clutch hub 50 is released.

On the other hand, in such a compressor 1, its housing 1b is connected to the engine side via a vibration isolating rubber (not shown), and the vibration isolating rubber damps mechanical vibration generated in the compressor 1 to further reduce the engine side and the vehicle. This mechanical vibration is prevented from propagating in the room.

(Problems to be solved by the invention) However, in such a vibration damping structure of the compressor 1,
Since the vibration generated in the compressor 1 is absorbed by the anti-vibration rubber, the absorption effect is insufficient in the low frequency range having the peak characteristic.

In view of the above-mentioned conventional problems, an object of the present invention is to suppress the vibration of a compressor by generating a vibration that cancels the vibration. To provide the structure.

(Means for Solving the Problem) In order to solve the above problems, the present invention arranges a core portion for accommodating an exciting coil and a clutch rotor with a gap, and supplies electric power to the exciting coil to provide the clutch. In a compressor in which a rotor is connected to a compressor drive shaft, the core portion is movably attached to a compressor housing via an elastic member, and a vibration sensor for detecting mechanical vibration is provided in the compressor housing, Control means is provided for supplying electric power to the exciting coil so that the core portion vibrates in a direction opposite to the mechanical vibration based on a detection signal of the vibration sensor.

(Operation) According to the present invention, the clutch rotor is excited by supplying electric power to the exciting coil, and the core portion containing the exciting coil is attracted to the clutch rotor side against the elastic force of the elastic member. . Here, when the electric power supplied to the exciting coil is changed, the attracting force is changed, and vibration is generated in combination with the elastic force of the elastic member.

Therefore, when the electric power supplied to the exciting coil is generated in a direction opposite to this vibration based on the vibration detected by the vibration sensor, the mechanical vibration of the compressor is attenuated by the vibration in the opposite direction. It will be.

(Embodiment) FIGS. 1, 3, and 4 show an embodiment of the present invention, in which the same components as those in the conventional example are designated by the same reference numerals. That is, 1 is a compressor having a drive shaft 1a, and 10 is a drive shaft 1a.
A cylindrical projection 3 containing an electromagnetic clutch for transmitting and releasing engine driving force, 40 a ring-shaped suction plate, 50 a clutch hub fixed to the end of the drive shaft 1a, and 60 a clutch hub 50 And a leaf spring that connects the clutch rotor 70 described later,
Reference numeral 70 denotes a clutch rotor, which has a friction surface portion 71 facing the suction plate 40 on one end side and a flange portion 72 extending inwardly on the other end side similarly to the conventional example.

80 is a core part, and a substrate 81 through which the drive shaft 1a penetrates in the center,
An inner ring 82 and an outer ring projecting from one surface of this substrate 81 in the axial direction.
83, and an exciting coil 84 is wound between the substrate 81 and the wheels 82, 83. Further, the peripheral edge side of one surface of the substrate 81 is the other end surface of the clutch rotor 70 and the flange portion.
72 and a predetermined gap.

90 is an elastic member formed of a metallic leaf spring.
The elastic member 90 has one end fixed to the housing 1b of the compressor 1 with a screw 91, and the other end fixed to the substrate 81 of the core portion 80.
It is welded to the other surface of the
It is attached to the housing 1b of (3) so that it can vibrate freely.

100 and 101 are vibration sensors composed of piezoelectric elements, which are used in the compressor 1
It is attached to the housing 1b of. The vibration sensor 100 detects mechanical vibration of the compressor 1 in one axial direction (right side in the drawing) A, and the vibration sensor 101 in the other axial direction (left side in the drawing) B mechanical vibration. Is being detected.

FIG. 3 is a block diagram showing a drive control circuit of the exciting coil 84, 110 is a CPU having a microcomputer configuration, and 111 is a voltage converter capable of mutually converting a voltage between 10V and 12V. The CPU 110 controls the voltage converter 111 based on the detection signals of the vibration sensors 100 and 101, and applies a voltage of 10V or 12V to the exciting coil 84.

Thus, when applying a voltage to the exciting coil 84,
A magnetic flux φ is formed as shown by the solid line arrow in FIG. 1, and the clutch rotor 70 and the drive shaft 1a are connected as in the conventional example.
By this connection, the driving force of the engine is transmitted to the compressor 1, and the compressor 1 is driven.

Although mechanical vibration is generated in the compressor 1 by driving the compressor 1, FIG. 4 shows a control flowchart of the CPU 110 for suppressing the mechanical vibration.

That is, when the vibrations in the A direction or the B direction are detected by the vibration sensors 110 and 111 and it is determined that the vibration is in the A direction (S1), a voltage of 12V is applied to the exciting coil 84 (S
2). When it is judged that the vibration is in the B direction (S
3), a voltage of 10V is applied to the exciting coil 84 (S4).

As described above, when the vibration of the compressor 1 is applied in the A direction, a high voltage is applied to the exciting coil 84. As a result, the substrate 81 of the core portion 80 is in the B direction, that is, the clutch rotor.
The elastic member 90 moves to the flange portion 72 side of 70 against the elastic force of the elastic member 90. At this time, vibration in the B direction is generated in the core portion 80, and the vibration in the A direction of the compressor 1 is damped.

On the other hand, when the vibration of the compressor 1 is applied in the B direction, a low voltage is applied to the exciting coil 84, which weakens the attractive force of the core portion 80, so that the core portion 80 is repelled by the elastic member 90. Move in direction A. The movement of the core portion 80 causes vibration in the A direction, and the vibration in the B direction of the compressor 1 is damped.

As described above, according to this embodiment, the vibration in the axial direction of the compressor 1 is attenuated by generating the vibration in the direction opposite to the mechanical vibration of the compressor 1, and the propagation of the vibration into the vehicle interior is suppressed. are doing. Moreover, since the core portion 80 is used as a vibration damping oscillator, the number of parts does not increase.

The vibration characteristics of the compressor 1 may be stored in the microcomputer in advance, and when the compressor 1 is driven, a voltage may be applied to the exciting coil 84 so as to have a phase opposite to the vibration characteristics. Further, although the elastic member 90 is made of a metallic material in the above-mentioned embodiment, it may be made of a rubber material as long as it has rigidity. Further, in the above embodiment, the exciting coil
Although the voltage of 84 is controlled, the attraction force of the core portion 80 may be changed by controlling the current.

(Effect of the Invention) As described above, according to the present invention, the core portion that houses the exciting coil generates vibration in the direction opposite to the mechanical vibration of the compressor in combination with the elastic force of the elastic member. Therefore, there is an advantage that this mechanical vibration can be reliably damped.
Further, since this core portion is used as a vibrator, there are advantages such as an increase in the number of parts and a higher cost.

[Brief description of drawings]

FIGS. 1, 3 and 4 show an embodiment of the present invention. FIG. 1 is a sectional view showing a clutch side of a compressor, and FIG.
FIG. 3 is a cross-sectional view showing a clutch side of a conventional compressor, FIG. 3 is a block diagram showing a drive control circuit of an exciting coil, and FIG.
It is a control flowchart of CPU. In the figure, 1 ... Compressor, 3 ... Electromagnetic clutch, 70 ... Clutch rotor, 80 ... Core part, 84 ... Excitation coil, 90 ... Elastic member, 10
0,101 ... Vibration sensor.

Claims (1)

[Scope of utility model registration request] 1. A compressor in which a core portion for accommodating an exciting coil and a clutch rotor are arranged with a gap therebetween, and electric power is supplied to the exciting coil to connect the clutch rotor to a compressor drive shaft, The core part is movably attached to the compressor housing via an elastic member, and a vibration sensor for detecting mechanical vibration is provided in the compressor housing, and a direction opposite to the mechanical vibration is provided based on a detection signal of the vibration sensor. A vibration damping structure for a compressor, further comprising control means for supplying electric power to the exciting coil so that the core portion vibrates.