JP2016017597A - Electromagnetic clutch and gas compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic clutch capable of releasing water without accumulation even when the water intrudes near an end face portion of a bearing disposed inside of a clutch rotor.SOLUTION: In an electromagnetic clutch 6 in which an armature 33 is attracted to a friction face side of a clutch rotor 31 against biasing force of a plate spring 35 by electromagnetic force of an electromagnet 32, the friction faces of the clutch rotor 31 and the armature 33 are connected, and rotary driving force transmitted to a pulley 30 is transmitted to a driving shaft 10, a water releasing path 39 is formed to be communicated with a space at a side opposite to the armature 33 in an axial direction of the clutch rotor 31 from the neighborhood of an end face at a side of the armature 33 to which a bearing 36 is press-fitted, of an inner peripheral wall face of the clutch rotor 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic clutch and a gas compressor including an electromagnetic clutch that is installed in an air conditioner mounted on a vehicle or the like and that connects and disconnects driving force transmission.

  For example, vehicles such as automobiles are provided with an air conditioner for adjusting the temperature in the passenger compartment. Such an air conditioner has a loop-like refrigerant cycle in which refrigerant (cooling medium) is circulated, and this refrigerant cycle is provided with an evaporator, a gas compressor, a condenser, and an expansion valve in this order. ing. The gas compressor of the air conditioner compresses the gaseous refrigerant evaporated by the evaporator into a high-pressure refrigerant gas and sends it to the condenser.

  Among these gas compressors, one that operates by receiving power from the outside includes an electromagnetic clutch for switching between receiving and stopping input of the power (see, for example, Patent Document 1).

  The electromagnetic clutch is configured so that the friction surface of the armature is attracted to the clutch rotor against the urging force of the leaf spring by a magnetic force generated by applying an electric current to the electromagnet. When the friction surface of the armature is attracted to the clutch rotor, the rotation of the clutch rotor is transmitted to the drive shaft of the compressor body through the armature.

  A pulley that transmits the rotational driving force of the engine via a belt is integrally provided on the outer peripheral surface of the clutch rotor. The clutch rotor is rotatably provided on the outer surface side of the housing of the gas compressor through a bearing. Further, when the gas compressor is in a non-operating state, a predetermined air gap is provided between the clutch rotor and the armature so that they are separated.

JP 2007-78103 A

  By the way, the gas compressor provided with the electromagnetic clutch as described above is installed near the engine in the engine room of the vehicle. For this reason, for example, when a wheel (water vehicle) splashes water while the vehicle (automobile) travels in the rain, water may adhere to the electromagnetic clutch of the gas compressor installed in the engine room.

  If water adheres to the electromagnetic clutch, for example, water may enter the vicinity of the end face of the bearing provided inside the clutch rotor through the air gap between the clutch rotor and the armature, and water may accumulate in the vicinity. . For this reason, water may enter the bearing from the lip seal portion of the bearing and the inside of the bearing may rust. If the inside of the bearing rusts, the clutch rotor cannot rotate smoothly, and the operating efficiency of the gas compressor decreases.

  Therefore, the present invention provides an electromagnetic clutch and a gas compressor that can escape even if water enters the vicinity of an end surface portion of a bearing provided inside the clutch rotor without water collecting. Objective.

  In order to solve the above-described problems, an electromagnetic clutch according to the present invention is configured so that a rotational driving force from a driving source is transmitted and the clutch rotor has a friction surface and is opposed to the friction surface of the clutch rotor. An armature having a friction surface, and the armature is attracted to the clutch rotor by electromagnetic force, and the rotational driving force transmitted to the clutch rotor by connecting the friction surfaces of the clutch rotor and the armature is An electromagnet to be transmitted to the armature, and an annular bearing that rotatably supports the clutch rotor on the housing side, and an outer peripheral surface of the bearing is an inner periphery of an inner opening formed in an axial direction of the clutch rotor. In the electromagnetic clutch press-fitted into the wall surface, the bearing on the inner peripheral wall surface of the clutch rotor is pressed. From near the end surface of the armature-side that is, it is characterized in that water release path so as to communicate is formed in a space having on the opposite side of the armature with respect to the axial direction of the clutch rotor.

  The gas compressor according to the present invention is housed in a housing and is driven with respect to a compressor main body that discharges a compressed high-pressure refrigerant by compressing a supplied refrigerant and a drive shaft of the compressor main body. A gas compressor including an electromagnetic clutch for connecting and disconnecting a rotational driving force from a source, wherein the electromagnetic clutch is the electromagnetic clutch according to any one of claims 1 to 5.

  According to the electromagnetic clutch (gas compressor) according to the present invention, even when water enters the vicinity of the end face on the armature side where the bearing is press-fitted on the inner peripheral wall surface of the clutch rotor, the water does not accumulate in this vicinity. Since water can escape through the water escape passage into the space on the opposite side of the armature with respect to the axial direction of the bearing, it is possible to prevent water from entering the bearing.

The schematic sectional drawing which shows the external appearance of the gas compressor (vane rotary type gas compressor) provided with the electromagnetic clutch which concerns on embodiment of this invention. AA sectional view taken on the line AA of FIG. (A) is a figure which shows the friction surface side of a clutch rotor, (b) is the BB sectional view taken on the line of Fig.3 (a). CC sectional view taken on the line of FIG.3 (b). The schematic sectional drawing of the clutch rotor in the modification of this embodiment.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a schematic cross-sectional view of a vane rotary type gas compressor (hereinafter referred to as “compressor”) as an example of a gas compressor including an electromagnetic clutch according to an embodiment of the present invention.

(Overall configuration of compressor 1)
The illustrated compressor 1 is configured as a part of an air conditioning system (hereinafter referred to as an “air conditioning system”) that performs cooling by using the heat of vaporization of a cooling medium, for example, and is a condensing component that is another component of the air conditioning system It is provided on the circulation path of the cooling medium together with a condenser, an expansion valve, an evaporator, etc. (all not shown). In addition, as such an air conditioning system, the air conditioning apparatus for adjusting the temperature in the vehicle interior of a vehicle (automobile etc.) is mentioned, for example.

  The compressor 1 compresses the refrigerant gas as a gaseous cooling medium taken from the evaporator of the air conditioning system, and supplies the compressed refrigerant gas to the condenser of the air conditioning system. The condenser liquefies the compressed refrigerant gas and sends it to the expansion valve as a high-pressure liquid refrigerant. The high-pressure and liquid refrigerant is reduced in pressure by the expansion valve and sent to the evaporator. The low-pressure liquid refrigerant absorbs heat from ambient air and vaporizes in the evaporator, and cools the air around the evaporator by heat exchange with the heat of vaporization.

  As shown in FIG. 1, the compressor 1 includes a substantially cylindrical main body case 2 that is open at one end side (left side in FIG. 1) and closed at the other end side, and a front that closes an opening at one end side of the main body case 2. A compressor main body 5 housed in a housing 4 composed of a head 3, a main body case 2, and a front head 3, and driving force from an engine (not shown) of a vehicle (automobile) as a drive source An electromagnetic clutch 6 for transmitting to the main body 5 is provided.

  The front head 3 is fixed at the opening end face side around the opening end of the main body case 2 by bolt fastening. The front head 3 has a suction port 7 for sucking low-pressure refrigerant gas from an evaporator (not shown) of the air-conditioning system, and the main body case 2 air-conditions high-pressure refrigerant gas compressed by the compressor body 5. It has a discharge port 8 for discharging to a condenser (not shown) of the system.

  As shown in FIG. 2, the compressor body 5 includes a substantially cylindrical rotor 11 that rotates integrally with the drive shaft 10, and the rotor 11 outside the outer peripheral surface (hereinafter referred to as “rotor outer peripheral surface”) 11 a. A cylinder 12 having a substantially elliptical inner peripheral surface (hereinafter referred to as “cylinder inner peripheral surface”) 12a that surrounds from the side, and a plurality of sheets that are provided so as to protrude from the rotor outer peripheral surface 11a toward the cylinder inner peripheral surface 12a The figure includes five plate-like vanes 13 and two side blocks (a front side block 14 (see FIG. 1) and a rear side block 15) that block both end faces of the rotor 11 and the cylinder 12.

  The compressor body 5 is held such that the front side block 14 side is fixed to the front head 3 by bolt fastening, and the rear side block 15 side is fitted to the inner peripheral surface of the body case 2. 2 is a cross-sectional view taken along line AA in FIG. In FIG. 2, the main body case 2 on the outer peripheral surface side of the compressor main body 5 is omitted.

  A suction chamber 16 is formed between the inner recess of the front head 3 and the front side block 14, and a discharge chamber 17 is formed in the main body case 2 on the rear side block 15 side. An oil separator 18 is installed on the outer end face of the rear side block 15 so as to be positioned in the discharge chamber 17.

(Configuration and operation of compressor body 5)
As shown in FIG. 2, the space between the cylinder inner peripheral surface 12a, the rotor outer peripheral surface 11a, and both side blocks 14, 15 (see FIG. 1) is partitioned by five vanes 13 installed at equal intervals. A plurality of compression chambers 20 are formed.

  Each vane 13 is slidably installed in a vane groove 21 formed in the rotor 11, and outwards from the rotor outer peripheral surface 11 a due to back pressure by refrigerating machine oil supplied to the bottom 21 a of the vane groove 21. Protruding.

  The cylinder 12 has a cylinder inner peripheral surface 12a whose cross-sectional outline surrounding the outer side of the rotor outer peripheral surface 11a is substantially elliptical. Each compression chamber 20 repeatedly increases and decreases in volume in the refrigerant gas suction process and the compression process accompanying the rotation of the rotor 11. In addition, the compressor 1 (compressor main body 5) of this embodiment has the suction | inhalation process and compression process of 2 times, while the rotor 11 carries out 1 rotation.

  The cylinder 12 has suction holes (not shown) for sucking the refrigerant gas G1 into the compression chambers 20, and discharge holes 22a and 22b for discharging the refrigerant gas G2 compressed in the compression chambers 20, respectively. Is provided.

  Specifically, in a stroke in which the volume of the compression chamber 20 increases, a low-pressure refrigerant gas is sucked into the compression chamber 20 through a suction hole formed in the front side block 14 and the cylinder 12, and in a stroke in which the volume decreases. The refrigerant gas confined in the compression chamber 20 is compressed, whereby the refrigerant gas becomes high temperature and high pressure. The high-temperature and high-pressure refrigerant gas G2 is discharged through discharge holes 22a and 22b to discharge chambers 23a and 23b, which are spaces surrounded by the cylinder 12, the housing 2, and both side blocks 14 and 15. The

  Each discharge chamber 23a, 23b is provided with a discharge valve 24 for preventing the refrigerant gas from flowing backward to the compression chamber 20 side and a valve support 25 for preventing excessive deformation (warping) of the discharge valve 24. The high-temperature and high-pressure refrigerant gas G2 discharged from the discharge holes 22a and 22b to the discharge chambers 23a and 23b passes through the discharge ports 26a and 26b formed in the rear side block 15 to the oil separator 18 provided in the discharge chamber 17. be introduced.

  As shown in FIG. 1, the refrigerating machine oil R separated from the refrigerant gas in the oil separator 18 is accumulated at the bottom of the discharge chamber 17, and the high-pressure refrigerant gas G <b> 2 after the refrigerating machine oil is separated is discharged from the discharge chamber 17. From the discharge port 8 to the condenser (not shown).

  The refrigerating machine oil R that accumulates at the bottom of the discharge chamber 17 is the oil passage formed in the side blocks 14 and 15 and the salai groove 27 (see FIG. 2) due to the high-pressure atmosphere of the high-pressure refrigerant gas discharged into the discharge chamber 17. ) Or the like, and is supplied to the bottom 21a of the vane groove 21 to become a back pressure that causes the vane 13 to protrude outward. In FIG. 2, the salai groove 27 on the rear side block 15 side is shown, but the salai groove is similarly formed on the front side block 14 side.

(Configuration and operation of electromagnetic clutch 6)
The electromagnetic clutch 6 is installed on the outer surface side of the front head 3, and a clutch rotor in which an annular pulley 30 for inputting the rotational driving force of the engine via a belt (not shown) is integrally formed on the outer peripheral surface. 31, an electromagnet 32 disposed on the front head 3 side, an armature 33 disposed with a predetermined air gap with the clutch rotor 31, a plate spring 35 coupled between the coupling plate 34 and the armature 33, a clutch A bearing 36 that rotatably supports the rotor 31 with respect to the front head 3 is provided.

  The connecting plate 34 is connected to the distal end side (the left side in FIG. 1) of the drive shaft 10. The drive shaft 10 is rotatably supported in the central through holes of the front side block 14 and the rear side block 15.

  During operation of the compressor 1 (compressor body 5), the friction surface 33 a of the armature 33 resists the urging force of the leaf spring 35 by the excitation of the electromagnet 32 provided inside the clutch rotor 31. By being attracted (connected) to the surface 31a, the rotational driving force of the engine transmitted to the pulley 30 via a belt (not shown) is applied to the drive shaft 10 via the armature 33, the leaf spring 35, and the connecting plate 34. Is transmitted to (rotor 11).

  When the energization is stopped and the excitation of the electromagnet 32 is released, the friction surface 33a of the armature 33 is separated from the friction surface 31a of the clutch rotor 31 and the adsorption (connection) is released.

  Next, details of the clutch rotor 31, which is a feature of the present invention, will be described.

  3A is a view showing the friction surface 31a side of the clutch rotor 31, and FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A.

  As shown in both drawings, an opening 31b penetrating along the direction of the axis a is formed in the inner central portion of the friction surface 31a of the clutch rotor 31, and an annular shape is formed on the inner peripheral wall surface of the opening 31b. The outer peripheral surface side of the bearing 36 is press-fitted and fixed. In the clutch rotor 31 shown in FIG. 3A, the left side of the figure is the armature 33 side, and the right side of the figure is the front head 3 side.

  The inner peripheral surface side of the bearing 36 is press-fitted and fixed to the outer peripheral surface on the front end side of the front head 3. A concave electromagnet storage space 31c in which an annular electromagnet 32 is stored is formed inside the pulley 30 of the clutch rotor 31. The end surface of the electromagnet storage space 31c on the front head 3 side (the right side in FIG. 3B) is open. A plurality of through grooves 31d are formed along the circumferential direction between the friction surface 31a of the clutch rotor 31 and the electromagnet storage space 31c.

  As shown in FIGS. 3B and 4, the inner peripheral wall surface of the opening 31 b of the clutch rotor 31 with which the outer peripheral surface of the bearing 36 contacts is on the friction surface 31 a side (see FIG. A plurality of concave grooves 37 extending from the left side of 3 (b) to the end face of the front head 3 side (the right side of FIG. 3B) are formed.

  The groove portions 37 are formed at four locations at 90 ° intervals along the circumferential direction. FIG. 4 is a cross-sectional view taken along the line CC of FIG. In the present embodiment, four groove portions 37 are formed on the inner peripheral wall surface of the opening 31b with which the outer peripheral surface of the bearing 36 contacts. However, the groove portions 37 may be formed within three locations or more than five locations.

  A ring-shaped groove 38 is formed on the inner peripheral wall surface of the clutch rotor 31 on the friction surface 31 a side where the outer peripheral surface of the bearing 36 is press-fitted so as to communicate with the groove 37.

  Since the groove portion 37 is blocked by the outer peripheral surface of the bearing 36 that is press-fitted, a hole-shaped water escape is formed between the groove portion 37 and the outer peripheral surface of the bearing 36 from the ring-shaped groove portion 38 along the axis a direction. A passage 39 is formed. This water escape passage 39 is formed along a space on the armature 33 side (left side in FIG. 3B) of the bearing 36 (hereinafter referred to as “bearing rear side space”) along the axis a direction of the outer peripheral surface of the bearing 36. It is provided so as to communicate with a space on the front head 3 side (right side in FIG. 3B) (hereinafter referred to as “bearing front side space”).

  For example, during running in the rain, the end surface portion of the bearing 36 provided on the inner side of the clutch rotor 31 (the rear side of the bearing 36) from the air gap side between the clutch rotor 31 and the armature 33 or from the connecting plate 34 side. Even if water enters in the vicinity of the space), the water that has entered the space ahead of the bearing is released through the water discharge passage 39 by the centrifugal force of the rotating clutch rotor 31 or the wind pressure associated with traveling, etc. Can do.

  The water discharged to the bearing front space is discharged to the outside through a gap between the clutch rotor 31 and the front head 3.

  As described above, even when water enters the vicinity of the end surface portion (the space behind the bearing 36) of the bearing 36 provided inside the clutch rotor 31, the water that has entered enters the space ahead of the bearing through the water release passage 39. Therefore, it is possible to prevent water from entering the inside of the bearing from the lip seal portion of the bearing 36.

  Thereby, it is possible to prevent the bearing 36 from being rusted by water, and further, the bearing grease in the bearing 36 does not leak to the friction surface 31 a of the clutch rotor 31.

  As a modification of the present embodiment, as shown in FIG. 5, an electromagnet housing space is provided on the inner peripheral wall surface of the clutch rotor 31 so as to communicate between the water escape passage 39 (groove portion 37) and the electromagnet housing space 31 c. You may form the communicating hole 40 inclined toward the opening side (right side of FIG. 5) of 31c. Other configurations are the same as those of the above embodiment.

  As described above, in the modification of the present embodiment shown in FIG. 5, when water enters the vicinity of the end surface portion (the space behind the bearing 36) of the bearing 36 provided inside the clutch rotor 31, The infiltrated water can escape to the bearing front side space through the water escape passage 39, and a part of the infiltrated water can be escaped from the electromagnet storage space 31 c through the communication hole 40 communicating with the water escape passage 39. Since it can escape also from an opening side, it can suppress that water permeates into the inside of a bearing from the lip seal part of the bearing 36.

  In addition, in the modification of this embodiment shown in FIG. 5, although the communicating hole 40 to the electromagnet accommodation space 31c side was provided in the middle part of the water escape passage 39 (groove part 37), in addition to this, for example, A communication hole 40 that communicates from the vicinity of the ring-shaped groove 38 on one end side of the water escape passage 39 (groove 37) to the electromagnet storage space 31c side may be provided.

  In the above embodiment, the water escape passage 39 is formed by closing the concave groove portion 37 formed on the inner peripheral wall surface of the clutch rotor 31 with the outer peripheral surface of the bearing 36 along the axial direction of the clutch rotor 31. However, from the vicinity of the end face of the inner peripheral wall surface of the clutch rotor 31 on the friction surface 31a side where the outer peripheral surface of the bearing 36 is press-fitted, the armature is opposite to the armature in the inner peripheral wall surface with respect to the axial direction of the clutch rotor 31. A communication hole that communicates with the space side may be provided, and a water escape passage may be formed by the communication hole.

1 Compressor (gas compressor)
2 Body Case 3 Front Head 4 Housing 5 Compressor Body 6 Electromagnetic Clutch 10 Drive Shaft 11 Rotor 12 Cylinder 30 Pulley 31 Clutch Rotor 31a Friction Surface 31c Electromagnet Storage Space 32 Electromagnet 33 Armature 35 Plate Spring 36 Bearing 37 Groove 38 Ring-shaped Groove 39 Water escape passage 40 Communication hole

Claims (6)

A clutch rotor having a friction surface and rotating with a rotational driving force transmitted from a driving source;
An armature having a friction surface disposed opposite to the friction surface of the clutch rotor;
An electromagnet that attracts the armature to the clutch rotor with electromagnetic force, connects the friction surfaces of the clutch rotor and the armature, and transmits the rotational driving force transmitted to the clutch rotor to the armature;
An annular bearing that rotatably supports the clutch rotor on the housing side,
In the electromagnetic clutch in which the outer peripheral surface of the bearing is press-fitted into the inner peripheral wall surface of the inner opening formed in the axial direction of the clutch rotor,
A water escape passage is provided so as to communicate with the space on the opposite side of the armature with respect to the axial direction of the clutch rotor from the vicinity of the armature side end face where the bearing is press-fitted on the inner peripheral wall surface of the clutch rotor. An electromagnetic clutch characterized by being formed.   The electromagnetic clutch according to claim 1, wherein the water escape passage is provided at a plurality of locations along a circumferential direction of the clutch rotor.   The water escape passage is formed in the axial direction of the clutch rotor, and is formed so as to communicate with spaces respectively facing both end sides where the bearings are press-fitted on the inner peripheral wall surface of the clutch rotor. The electromagnetic clutch according to claim 1 or 2, characterized in that.   The water escape passage is formed by closing a concave groove formed in an inner peripheral wall surface of the clutch rotor along an axial direction of the clutch rotor with an outer peripheral surface of the bearing. The electromagnetic clutch according to any one of 1 to 3. The electromagnet is disposed in an electromagnet storage space provided inside the clutch rotor,
The electromagnetic clutch according to claim 4, wherein the groove portion communicates with the electromagnet housing space side through a communication hole from the middle of the groove portion. A compressor main body that is housed in a housing and that compresses the supplied refrigerant and discharges the compressed high-pressure refrigerant; In a gas compressor comprising:
The gas compressor according to claim 1, wherein the electromagnetic clutch is an electromagnetic clutch according to claim 1.