JPH0320121A - Electromagnetic clutch - Google Patents

Abstract

PURPOSE:To prevent wear due to the collision of a pin with a pin hole by arranging a wear-resistant ring sliding plate between a rotor and an armature, and forming a sleeve whose inside diameter is fitted to the pin and outside diameter is closely fitted to a pin hole, on the sliding plate. CONSTITUTION:When an exciting coil 121 is energized, and armature 132 is attached by a rotor 110 for close engagement with a rotor frictional surface 112. As a result, the resistance of a magnetic circuit decreases, the amount of magnetic flux increases and the magnetic flux of an absorbing part 140 increases, and the top end 136 of a pin 142 comes into contact with a sliding plate 150 against the force of a spring 143. A load increases and relative slippage occurs between the armature 132 and the rotor 110. When the position of the sleeve 151 of the sliding plate 150 coincides with that of the pin 142, the pin 142 is fitted to a sleeve 151 by the attaching force of a pin absorbing part 140. It is thus possible to protect a pin hole 113 and the rotor frictional surface 112 by the sliding plate 150 and a sleeve 151 even at the time of high- speed rotation and prevent the wear at the time of pin fitting.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a motor which is disposed between a driving device and a driven device, and is adapted to intermittently transmit rotation from the driving device to the driven device. The present invention relates to an electromagnetic clutch suitable for, for example, a compressor used in a vehicle air conditioner.

[Conventional technology]

Conventionally, a general dry single-plate electromagnetic clutch consists of a stator that generates magnetic force, a rotor supported by bearings to be rotated by the rotational force from the drive source, and an armature that can be moved in the axial direction by the magnetic force of the stator. (Refer to Japanese Utility Model Publication No. 14998/1983).

When an electromagnetic clutch with such a structure is used, for example, attached to a compressor of a vehicle air conditioner, a stator that generates magnetic force is attached to the compressor, and a cone compressor is rotatably connected to the cone compressor via a bearing. It consists of a rotor attached to the compressor and a knob with an armature that can be moved in the axial direction by the magnetic force of the stator attached to the compressor, and the friction surface of the armature that is provided opposite to the friction surface of the rotor is the stator. The motor is attracted to the rotor by the magnetic force generated by the motor, and the torque transmitted from the drive device is transmitted to the compressor, which is the driven side. In the electromagnetic clutch with the structure described above, rotational force is transmitted exclusively by the frictional force between the rotor and the armature, but this frictional force has a limit, making it difficult to generate high torque. there were.

In order to solve this problem, the present applicant first developed an electromagnetic clutch that is configured to engage a pin hole provided in a pin converter attached to an armature when transmitting rotation to a driven body. (See Japanese Patent Application No. 171945/1983).

In this prior art, the armature is provided with a pin that is biased by a spring in a direction away from the rotor-side friction surface, and the rotor friction surface is provided with a pin hole corresponding to the pin, and when the excitation coil is activated, the armature and the A pin is attracted to the rotor friction surface and fitted into the pin hole to transmit rotational force.

[Problem to be solved by the invention]

The clutch of the above-mentioned prior application operates smoothly when starting under normal light loads, but when the clutch is operated under a condition where the starting torque is large, such as when the compressor is in a liquid compression state, the gap between the armatine and the rotor Since a torque that exceeds the force due to the frictional engagement of The clutch may violently collide with the side wall of the hole entrance, which causes large wear on the rotor pin sliding surface and the side wall of the pin hole entrance, which tends to shorten the life of the clutch.

In view of the above-mentioned points, an object of the present invention is to provide a highly durable electromagnetic clutch that prevents wear of the rotor's pin hole entrance and sliding surface in a type of electromagnetic clutch that uses pins and pin holes. There is.

[Means to solve the problem]

That is, the present invention arranges a wear-resistant ring-shaped sliding plate between the rotor friction surface and the armature friction surface in the electromagnetic clutch of the prior invention, and the ring-shaped sliding plate has an inner diameter portion. A sleeve is integrally formed to fit with the pin and whose outer diameter portion tightly fits into the pin hole, and the pin fits into the sleeve while sliding on the ring-shaped sliding plate. shall be.

[For production]

As mentioned above, by attaching a sliding plate with a sleeve that fits into the pin hole to the sliding part of the rotor friction surface where the pin slides, the pin slides on the sliding plate when the clutch is activated and fits into the pin hole. Engages with the fitted sleeve. The sliding plate and sleeve are made of highly wear-resistant materials, so even if the clutch is operated under high load, the sliding plate will not wear out due to sliding with the pin, and the pin will not cause impact to the sleeve. No wear occurs at the sleeve inlet even when engaged with the sleeve. Furthermore, if a protrusion is formed on the pin entry side of the sleeve inlet on the sliding plate, if there is a large difference in rotational speed between the rotor and armature and the sliding speed of the pin is high, the pin will be flipped up by the protrusion. Since the pin jumps over the sleeve entrance, the pin and sleeve will not engage unless the difference in rotational speed between the rotor and armature falls below a certain value, completely preventing wear on the sleeve entrance due to collision with the pin.

〔Example〕 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a first embodiment of an electromagnetic clutch according to the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG.

In the figure, 210 is the housing of the compressor 200, . 22
0 is the rotation axis. Reference numeral 120 denotes a stator housing made of a magnetic material such as mild steel, and an excitation coil 121 is embedded inside the stator housing with epoxy resin 122. This excitation coil 121 is connected to an external power source via a lead wire (not shown). Further, a mounting flange 123 is joined to the stator housing 120 by welding or the like, and the stator housing 120 is fixed to the housing 210 of the compressor 200 by a circlip 124 via the mounting flange 123. 110
is a rotor made of a magnetic material such as mild steel, which is integrally formed with the boule 111, and is rotatably mounted on the housing 210 of the compressor 200 via a bearing 160. Bearing 1
The outer ring 161 of 60 is fixed to the rotor 110 by press fitting,
The inner ring 162 is fitted into a cylindrical boss 211 that is integrally formed with the housing 210 of the compressor 200, and is fixed to the boss 211 by a circlip 163.

The friction surface 112 of the rotor 110 is provided with a plurality of pin holes 113 into which pins 142 (to be described later) engage, and a ring-shaped sliding plate 150 shown in FIG. 3 is attached to the portion that comes into contact with the pins during rotation. has been done. The sliding plate 150 is punched into a ring shape by press working from a flat plate of wear-resistant material such as carbon tool steel, and a plurality of sleeves 151 (three in FIG. 3) are attached to the rotor friction surface on the circumference. pin hole 1
This is a member that has been shaped by punching or subjected to appropriate heat treatment at the position corresponding to 13. Figure 4 is Figure 3 B-B
The sleeve 151 is shown in cross-section along the line. - The inner diameter of the sleeve is 1 to 3 mm relative to the outer diameter of the pin 142.
The outer diameter is a size suitable for press-fitting into the pin hole 113 of the rotor friction surface. This sliding plate 150 is connected to the sleeve 15 as shown in FIG.
1 into the pin hole 113, so that the sliding surface 153 is aligned with the pin 1.
The sliding surface 153 is fixed to the rotor friction surface so as to face the friction surface 112 of the rotor 110. 1
~0. It is designed to be as low as 3 ffim.

(Dimension G in Figure 2) Front view of the rotor with the sliding plate installed (View D in Figure 2)
is shown in Figure 5.

Further, the rotor friction surface 112 is 0.3 to lIII.
An annular armature 132 made of a magnetic material such as mild steel is disposed opposite to the rotor with a minute gap of about I1 interposed therebetween. A hub 131 is attached to the rotary shaft 220 of the compressor 200 so as to be integrally rotatable via a spline 221, and the armature 132 is attached to the hub 131 in the direction of separating it from the rotor friction surface 112. Rivets 134, 13 through a plurality of leaf springs 133
It is attached by 5. The armature 132 is provided with a guide hole 136, into which a pin 142 made of a non-magnetic material such as austenitic stainless steel is fitted. The portion 140 is joined by press fitting or the like. pin 142
is pressed against the stopper 141 by a coiled spring 143 that urges it away from the armature 132, and the stopper 141 is made of a non-magnetic material such as aluminum.
is fixed.

In the electromagnetic clutch constructed in this way, the compressor 2
00, when the exciting coil 121 is energized, a magnetic flux is generated as shown by the broken line i in FIG. 2, and a force is immediately applied to the armature 132 to attract the rotor 110. As a result, the leaf spring 133 is elastically bent, and the armature 132 moves in the axial direction, and is brought into close contact with the rotor friction surface 112 of the rotor 110 by suction, thereby engaging in friction. In normal startup, the time required from energization of the excitation coil 121 to completion of frictional engagement with the rotor friction surface of the armature armature 132 is 20 minutes.
~4Qms.

Due to the close contact between the armature core 132 and the rotor 110, the resistance of the magnetic circuit decreases and the amount of magnetic flux increases. As a result, the magnetic flux flowing through the pin adsorption portion 140 increases, and an attractive force that exceeds the spring urging force of the spring 143 holding the pin 142 acts, causing the tip of the pin 136 to move toward the sliding plate 150.
is brought into contact with. This operation is performed by the spring 143 so that there is a delay of 40 to 7Q+ns after the excitation coil 121 is energized.
The drag force is set. Here, when the load of the compressor 200 increases and exceeds the frictional force between the friction surfaces of the armature 132 and the roller 110, the armature 132 and the rotor 110
The sleeve 151 of the sliding plate 150 causes relative sliding.
The positions of the pin 142 match, and the pin 142 is fitted into the sleeve 151 by the suction force acting on the pin suction portion 140. In this embodiment, the outer diameter of the pin 142 is 5 m, the inner diameter of the sleeve 151 is 8 alI1, and the pin suction part 140 is
The suction power of 0.3~0. 6 kg, and the relative speed of the armature 132 and rotor 110 is 1ooorp.
Although the pin 142 and sleeve 151 can be fitted together up to a speed of approximately
It is approximately 0 rpm, and the above-mentioned pins are fitted with almost no shock.

In addition, the load fluctuation of the compressor 200 is caused by the armchair 132
Since the frictional connection capacity of the rotor 110 is lower than that of the pin 142
The difference between the outer diameter of the pin hole 152 and the inner diameter of the pin hole 152 is 1 to 3 as described above.
Although it is said to be about mm, due to load fluctuations of the compressor, pin 1
42 vibrates within the sleeve 151 and collides with the side wall of the sleeve 151, making it possible to transmit a large load torque without generating abnormal noise.

Furthermore, during liquid compression start-up or high-speed start-up, under the condition that the above-mentioned frictional engagement time exceeds the operating time of the pin 142, the relative speed between the armature 132 and the rotor 110 is reduced by the above-mentioned frictional engagement, but is still 50 orpm or more. Although some shock occurs when the pins are mated, the frequency of such activation is low and it is not at a level that poses a problem.

Further, even in such a state, the rotor friction surface 112, the pin hole 113, and the side wall portion are protected by the highly hard sliding surface 153 of the sliding plate 150 and the sleeve 150, so there is no risk of wear.

6 and 7 are partial views showing the shape of a sliding plate used in a second embodiment of the present invention, and FIG. 7 is a sectional view taken along the line CC in FIG. 6.

In this embodiment, when the sleeve 151 of the sliding plate 150 engages with the pin 142, the sliding surface 153 on the side where the pin 142 enters is bent by press working to form the protrusion 151.
It is shaped like 4.

When the clutch is operated, a large load is applied to the armature 13.
2 and the rotor 110 is large, the pin 14
2 slides on the sliding surface 153 at a high sliding speed, so when it passes the protrusion 154, it is flipped upward and jumps over the sleeve 151, so that it does not engage with the sleeve 151. This prevents impactful engagement when the relative speed is high, and the pin 142 and sleeve 151 are engaged only when the relative speed becomes sufficiently small due to the frictional engagement between the armature 132 and the rotor 110. Impact during fitting and wear of the artificial part of the sleeve 151 due to it can be completely prevented.

In this embodiment, there is a possibility that the pin 142 and the sliding surface 153 slide for a longer time than in the past, but the sliding plate 150
As in the embodiment described above, since it is made of a wear-resistant material such as carbon tool steel, there is no need to worry about wear of the sliding surface 153.

In this embodiment, the height of the projection of the diaphragm 150 (dimension H in FIG. 7) is approximately 0.1 to 0.3 mm so as to be approximately the same height as the friction surface of the rotor 110.

Further, in this embodiment, the protrusion is formed only on the side where the pin 142 of the sleeve entrance enters, but the effect will be different even if the protrusion is formed around the entire circumference of the sleeve entrance part to improve processing. do not have.

〔Effect of the invention〕

As described above, the present invention provides a clutch by providing a wear-resistant sliding plate on the part that slides on the pin when the clutch is activated, thereby preventing wear on the rotor friction surface and the pin hole entrance due to sliding and collision with the pin. This has the effect of improving the durability of the product and extending its lifespan.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of the electromagnetic clutch according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is a
FIG. 6 is a partial view of the sliding plate of the second embodiment of the present invention; FIG.
The figure is a sectional view taken along line 1-1 in FIG. 6. 110...mouth. 112...Friction surface,
113... Pin hole, 121... Excitation coil, 132
... Armature, 133 ... Leaf spring, 142 ...
・Pin, 145...Guide hole, 150...Sliding plate,
151...Sleeve, 154...Protrusion. 2nd Figure 121... Exciting coil 150... Sliding plate 140... Adsorption part 153... Sliding surface

Claims (1)

[Scope of Claims] 1. A stator having an excitation coil, a rotor that is rotated by a rotational force from a drive source and has a friction surface on one side, and a friction surface opposite to the friction surface of the rotor, and an armature that is movably attached to the rotating shaft in the axial direction with a predetermined gap between the armature and the rotor;
The excitation coil is actuated to bring the friction surface of the armature into contact with the friction surface of the rotor, thereby transmitting the rotational force of the rotor to the rotating shaft, and the armature has a rotor extending in a direction away from the friction surface of the rotor. An electromagnetic clutch is provided with an energized pin, a pin hole corresponding to the pin is provided in the friction surface of the rotor, and the rotational force is transmitted by fitting the pin and the pin hole when the excitation coil is activated. A wear-resistant ring-shaped sliding plate is disposed between the rotor friction surface and the armature friction surface, and the ring-shaped sliding plate includes:
A sleeve is integrally formed, the inner diameter part of which fits into the pin, and the outer diameter part of which fits tightly into the pin hole, and the pin fits into the sleeve while sliding on the ring-shaped sliding plate. An electromagnetic clutch characterized by: 2. A protrusion is provided in a portion around the sleeve inlet on the sliding surface of the sliding plate on which the pin slides, at least on the side where the pin enters when engaged with the pin. An electromagnetic clutch according to claim 1.