JPS5836899Y2 - Anti-reverse electromagnetic clutch for compressor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic clutch for a compressor used in a car air conditioner or the like, and particularly to an electromagnetic clutch that can prevent reverse rotation.

An electromagnetic clutch used in a conventional car air conditioner is shown in Fig. 1, in which an armature plate 1 is held by an armature bubble 2 with a leaf spring 6, and the armature bubble 2 is fixed to a compressor shaft 8. has been done.

Then, a clutch rotor 3 driven by a belt by an automobile engine is rotatably supported on a compressor casing I via a bearing 9, and an electromagnetic coil 4 is incorporated into the clutch rotor 3 via a field 5. Arranged so that the amateur board 1 can be sucked,
This constitutes an electromagnetic clutch.

That is, when the electromagnetic coil 4 is energized, the field 5 is excited, and the armature plate 1 is attracted to the friction surface of the clutch rotor 3, and the driving force of the clutch rotor 3 is transmitted to the compressor shaft 8 by the frictional force. ing.

However, with such a conventional electromagnetic clutch, if the electromagnetic clutch is turned off while the compressor is operating, the rotation of the compressor shaft 8 is no longer restrained, so immediately after the electromagnetic clutch is turned off, the compressor shaft 8 is turned off. There is a problem in that the pressure difference between the discharge line and the suction line causes the pressure to reverse and generate noise.

The present invention is an attempt to solve these problems, and is a reversal prevention type for compressors in which a locking means for preventing reversal is provided between the armature bubble of the electromagnetic clutch and the compressor casing. The purpose is to provide an electromagnetic clutch.

Therefore, the reversal prevention electromagnetic clutch for a compressor of the present invention can rotate coaxially with the compressor shaft via an armature plate connected to an armature bubble that can rotate together with the compressor shaft, and a bearing on the compressor casing. clutch rotor and
In the electromagnetic clutch for a compressor, which is composed of an electromagnetic coil that is incorporated into the clutch rotor and can attract the armature plate, a 1M, ttz ring is provided with a large number of cam surfaces and locking surfaces alternately on the peripheral edge. A plurality of pawls are fixed to the tip of the compressor casing and are pivotally attached to the armature barb, and are capable of engaging and disengaging from the locking surface of the locking ring. It is characterized by the fact that it is equipped with a spring that biases it toward the periphery.

Hereinafter, a reversal prevention electromagnetic clutch for a compressor as an embodiment of the present invention will be explained with reference to the drawings. Figure 2 is an exploded view showing the inside of the armature plate, and Figure 3 is an exploded view showing the outside of the armature plate. , FIG. 4 is an exploded view of the clutch rotor facing the armature plate, and FIG. 5 is a longitudinal cross-sectional view of the essential parts of a reverse-preventing electromagnetic clutch constructed by assembling the armature plate and clutch rotor to a compressor. FIG. 6 is an explanatory diagram showing the engaged state of the locking ring and pawl in the electromagnetic clutch, FIG. 1 is a vertical sectional view of the main part of the electromagnetic clutch corresponding to the engaged state shown in FIG. 6, FIG. 8 is an explanatory diagram showing a detached state of the locking ring and pawl of the electromagnetic clutch, and FIG. 9 is a longitudinal sectional view of a main part of the electromagnetic clutch corresponding to the disengaged state of FIG. 8.

As shown in FIGS. 2-5, the compressor shaft 22
An armature plate 20 is connected to an armature bubble 13 which can rotate together with the armature bubble 13 via three leaf springs 16, and three claws 11 are pivotally mounted at equal intervals on the inner peripheral edge of the armature bubble 13. has been done.

Furthermore, a clutch rotor 14 is mounted on the compressor casing 21 via a bearing 11, and an electromagnetic coil 19 incorporated into the clutch rotor 14 via a field 18 can attract the armature plate 20 when energized. ing.

A locking ring 15 is provided at the tip of the compressor casing 21 concentrically with the compressor shaft 22.
is fixed, and a large number of cam surfaces 15a and locking surfaces 15b are alternately formed on the peripheral edge of this ring 15.

Three claws rotatably attached to Amateur Babu 13 IN East! The locking surface 15b of the J song 5 can be engaged with to prevent the compressor shaft 22 from reversing, and when the electromagnetic clutch is not working, the locking surface 15b
To ensure that the winter melon 11 is engaged with the claw 11,
A spring 12 is attached to urge the tip of the locking ring 15 toward the peripheral edge of the locking ring 15.

The latch rotor 14 is formed with a groove 14a into which a belt (not shown) fits.

With the above-mentioned configuration, when the electromagnetic clutch is in the OFF state where the electromagnetic coil 19 is de-energized, the claw 11 attached to the armature bubble 13 is moved by the spring 12 to the detent ring, as shown in FIG. 15 and, therefore, the torque that attempts to reverse the compressor shaft 22 is supported by the compressor casing 21 via the armature bubble 13, the pawl 11, and the locking surface 15b of the locking ring 15. Reversal of the compressor shaft 22 is well protected.

On the other hand, since the clutch rotor 14 is only supported by the bearing 1γ on the compressor casing 21, it can idle freely as long as it is driven by the belt even when the electromagnetic clutch is off.

Next, when the electromagnetic coil 19 is energized and the compressor is operating, the armature plate 20 is attracted to the clutch rotor 14, as shown in FIGS. 8 and 9, and the armature bubble 13 and the compressor shaft 22 are integrated. and rotate in the direction of the arrow.

In this state, the pawl 11 is pressed against the clutch rotor 14 by the action of the magnetic field of the electromagnetic coil 19 and centrifugal force, so it does not come into contact with the locking ring 15 at all, and the pawl 11 does not contact the locking ring 15 at all.
rotate with.

At the moment when the electromagnetic coil 19 is energized from the OFF state of the electromagnetic clutch shown in FIGS.
Almost simultaneously with the clutch rotor 14, the eighth
, 9, the pawl 11 is removed from the locking ring 15, so that the rotation of the clutch rotor 14 and compressor shaft 22 is not hindered.

Further, when the compressor is operating with the electromagnetic clutch on as shown in FIGS. 8 and 9, when the electricity to the electromagnetic coil 19 is stopped, the armature plate 20 immediately separates from the clutch rotor 14, but the pawl 11 Due to the centrifugal force caused by the inertial rotation of the compressor shaft 22, the compressor shaft 22 remains in contact with the clutch rotor 14 for a while.

However, if the rotation of the compressor shaft 22 completely stops due to the pressure difference between the discharge line and the suction line in the compressor, the pawl 11 is separated from the clutch rotor 14 due to the biasing force of the spring 12, and the locking ring 15 and the compressor shaft 22 attempts to reverse, the locking surface 15 of the pawl 11 and the locking ring 15
The engagement with b prevents the reversal.

As described in detail above, according to the electromagnetic clutch for preventing reverse rotation for a compressor of the present invention, the pawl 11 and the locking ring 15 engage with each other in the clutch-off state, and the reverse rotation is reliably prevented from electric shock. At the same time that the clutch is turned on, the claw 11 for preventing reverse rotation quickly releases the locking ring 15, so 1
Unlike normal ratchets, there is no problem such as the pawl being flicked by the cam.

In addition, when the clutch is on, the claw 11 can be completely disengaged from the locking ring 15 by the attractive force and centrifugal force of the electromagnetic coil 19, so that the claw, etc. can be completely separated from the locking ring 15 during forward rotation, unlike conventional reverse rotation prevention mechanisms. There is no wear and tear and sufficient durability is achieved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional electromagnetic clutch for a compressor, Figs. 2 to 9 show a reversal prevention type electromagnetic clutch for a compressor according to the present invention, and Fig. 2 shows the inside of its armature plate. Figure 3 is an exploded view showing the outside of the armature plate, Figure 4 is an exploded view of the clutch rotor facing the armature plate, and Figure 5 shows the armature plate and clutch rotor assembled to the compressor. FIG. 6 is an explanatory view showing the state of engagement between the locking ring and the pawl in the electromagnetic clutch, and FIG. 8th longitudinal sectional view of the main part of the electromagnetic clutch corresponding to the state
This figure is an explanatory diagram showing a disengaged state of the locking ring and pawl of the electromagnetic clutch, and FIG. 9 is a longitudinal sectional view of a main part of the electromagnetic clutch corresponding to the disengaged state of FIG. 8. 11...bo, 12...spring, 13...
...Amateur bubble, 14...Clutch rotor 14a...Belt groove, 15...
Engagement ring, 15a...Cam surface, 15b...
...Locking surface, 16...Plate spring, 1γ...
...Bearing, 18...Field, 19
......Electromagnetic coil 20...Amateur plate, 21...Compressor casing, 22
・・・・・・Compressor shaft.

Claims (1)

[Scope of utility model registration request] 57) an armature plate that rotates integrally with the compressor shaft and is coupled to the armature bubble; a clutch rotor that can rotate coaxially with the compressor shaft via a bearing on the compressor casing; In an electromagnetic clutch for a compressor, which is composed of an electromagnetic coil capable of attracting a plate, a locking ring having a plurality of cam surfaces and locking parts alternately provided on the periphery is fixed to the tip of the compressor casing. , a plurality of pawls capable of engaging and disengaging from the locking portion of the locking ring are pivotally attached to the armature bubble, and a spring biases the tips of the pawls toward the peripheral edge of the locking ring. It is characterized by being equipped with
Anti-reverse electromagnetic clutch for compressors.