Electromagnetic clutch, and vibration damping structure

Abstract

To provide a technique that can prevent false detection of the position / operation of an armature of an electromagnetic clutch, and can prevent fatigue fracture of a detection plate.SOLUTION: A vibration damping structure 3 is a structure for damping vibration of a detection plate 4 for detecting the position of an armature 5 constituting an electromagnetic clutch 10, and comprises a pair of inhibition means 1a and 1b provided so as to sandwich the detection plate 4 in a vibration direction of the detection plate 4. Elastic bodies are used as the inhibition means 1a and 1b, and may be attached onto adapters 2a and 2b provided on end parts of an opening part 9H of a case 9 of the electromagnetic clutch 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic clutch and a vibration damping structure, and more particularly to a technique for damping vibration in an electromagnetic clutch whose rotation can be arbitrarily switched. [Background technology]

[0002] 6 and 7 are cross-sectional explanatory diagrams of the essential parts showing an example of the configuration of a conventional electromagnetic clutch, each showing a state where it is switched to a different switching target. Electromagnetic clutch 710 is a device in which armature 75 moves linearly to switch connections, and is composed of armature 75, switching targets 77A and 77B such as meshing teeth that connect with armature 75 by meshing, electromagnet 78, and coil spring 76. The entire device is housed in case 79.

[0003] When the electromagnet 78 is not energized (FIG. 6), the armature 75 is pressed against the switching target 77A by the reaction force of the coil spring 76, and is connected to it. On the other hand, when the electromagnet 78 is energized (FIG. 7), the armature 75 is attracted to the switching target 77B, and is connected to it. When the electromagnet 78 is energized, the armature 75 moves linearly. To detect the operation and position of the armature 75 from the outside, a detection plate 74, usually made of metal, is attached to the armature 75. The detection plate 74 extends from a case opening 79H to the outside of the case 79. The detection plate 74 is detected by detection means such as a photosensor or a magnetic sensor, and the operation and position of the armature 75 are confirmed.

[0004] Patent applications have been filed for electromagnetic clutches in the past. For example, Patent Document 1, listed below, discloses an electronic control device that determines that resonance is occurring in the rotating shaft and leaf spring members when the change in the value of the current flowing through the electromagnetic coil exceeds a certain value, as a measure to suppress abnormal noise caused by resonance in an electromagnetic clutch drive mechanism. When this determination is made, a relay switch is turned off, and rotational force from the driving engine is not transmitted, stopping the compressor. This stops the resonance occurring in the leaf spring members and preventing the transmission of vibrations. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2010-59986 A "Driver for electromagnetic clutch" Summary of the Invention [Problem to be solved by the invention]

[0006] Figure 8 is an explanatory diagram showing the problem caused by shock during switching of the conventional electromagnetic clutch shown in Figures 6 and 7. As shown in the figure, in conventional electromagnetic clutch 710, when the clutch is switched between switching targets 77A and 77B, such as meshing teeth, the detection plate 74 vibrates due to the impact of a collision caused by linear motion transmitted from armature 75. The large amplitude of this vibration or the length of the vibration duration can cause the position detection sensor to erroneously detect the position and movement of armature 75. In the figure, M is the linear motion toward switching target 77A, M' is the reaction due to the shock, and V is the vibration.

[0007] Furthermore, repeated vibrations of the same kind can also cause fatigue damage to the detection plate 74. As shown in the figure, the detection plate 74 is positioned so that it extends outward from the armature 75, and this large distance is also one of the causes of increased vibration. Technology is needed to prevent erroneous detection of the position and movement of the armature 75 and fatigue damage to the detection plate 74.

[0008] Therefore, the problem that the present invention aims to solve is to provide a technology that can eliminate the problems of the conventional technology, prevent erroneous detection of the armature position and operation of the electromagnetic clutch, and prevent fatigue damage to the detection plate. [Means for solving the problem]

[0009] As a result of studying the above-mentioned problems, the inventor of the present application came up with the idea of ​​damping the vibration of the detection plate by contacting it with a stopping means made of an elastic material or the like at the stopping position of the detection plate, and based on this idea, completed the present invention. That is, the invention claimed in this application, or at least the invention disclosed therein, as a means for solving the above-mentioned problems, is as follows.

[0010] [1] A structure for damping vibration of a detection plate for detecting the position of an armature that constitutes an electromagnetic clutch, characterized in that it comprises a pair of restraining means provided on either side of the detection plate in the vibration direction of the detection plate, and the restraining means restrain the detection plate from moving toward them. [2] The vibration damping structure described in [1], characterized in that the detection plate protrudes to the outside from an opening provided in a case that houses the electromagnetic clutch, and the restraining means is provided at the end of the opening. [3] The vibration damping structure according to either [1] or [2], characterized in that the restraining means has a shock absorbing or cushioning effect. [4] The vibration damping structure according to [3], characterized in that the restraining means is formed of an elastic body. [5] An electromagnetic clutch comprising the vibration damping structure described in [3]. [Effects of the Invention]

[0011] The electromagnetic clutch and vibration damping structure of the present invention are configured as described above, which can prevent erroneous detection of the armature position and operation of the electromagnetic clutch and prevent fatigue damage to the detection plate. In other words, the detection plate attached to the armature can damp vibrations generated by the armature in a shorter time, thereby reducing erroneous detection by the position detection sensor. This can also provide an improvement in the reduction of the detection plate's lifespan due to fatigue damage such as metal fatigue caused by vibration. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional explanatory view of a main part showing the basic configuration of an electromagnetic clutch equipped with a vibration damping structure of the present invention (in a state switched to switching object A). [Figure 2] 1 is a cross-sectional explanatory view of a main part showing the basic configuration of an electromagnetic clutch equipped with a vibration damping structure of the present invention (in a state where it is switched to switching object B). [Figure 3] FIG. 2 is a hexagonal view of an adapter constituting an embodiment of the vibration damping structure of the present invention. [Figure 4] FIG. 4 is a hexagonal view showing a state in which a restraining means is attached to the adapter shown in FIG. 3. [Figure 5] 1A to 1C are six-view diagrams of an embodiment of a vibration damping structure according to the present invention. [Figure 6] FIG. 10 is an explanatory cross-sectional view of a main part showing an example of the configuration of a conventional electromagnetic clutch (in a state where it is switched to switching object A). [Figure 7] FIG. 10 is an explanatory cross-sectional view of a main part showing an example of the configuration of a conventional electromagnetic clutch (in a state where it is switched to switching object B). [Figure 8] FIG. 8 is an explanatory diagram illustrating a problem caused by shock at the time of switching the conventional electromagnetic clutch shown in FIGS. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be described in detail below with reference to the drawings. 1 and 2 are cross-sectional explanatory diagrams of the main part showing the basic configuration of an electromagnetic clutch equipped with the vibration damping structure of the present invention, each showing a state in which it is switched to a different switching target. As shown in the figures, this vibration damping structure 3 is a structure for damping the vibration of a detection plate 4 that detects the position of an armature 5 that constitutes an electromagnetic clutch 10, and is mainly composed of a pair of restraining means 1a and 1b that are provided on either side of the detection plate 4 in the vibration direction of the detection plate 4.

[0014] With this configuration, the vibration damping structure 3 is configured such that, in either of the following states, the electromagnet 8 is not energized and the armature 5 is pressed against and connected to the switching target 7A by the reaction force of the coil spring 6, as shown in FIG. 1, or the electromagnet 8 is energized and the armature 5 is attracted to and connected to the switching target 7B, as shown in FIG. 2, the restraining means 1a and 1b restrain the detection plate 4 approaching them, suppressing its amplitude and repelling it back. This action is repeated between the two restraining means 1a and 1b, so the vibration of the detection plate 4 between the two restraining means 1a and 1b is quickly damped, the detection plate 4 stops quickly, and the desired purpose is achieved. Note that the restraining means 1a, etc. should be formed and installed with a strength sufficient to withstand repeated collisions with the detection plate 4.

[0015] The detection plate 4 extending from the armature 5 is provided to protrude outward from an opening 9H provided in the case 9 that houses the electromagnetic clutch 10, and as shown in the figures, the restraining means 1a and 1b of this vibration damping structure 3 can be configured to be provided at the ends of the opening 9H. Specifically, this can be done by providing adapters 2a and 2b for attaching the restraining means 1a and 1b at opposite ends of the opening 9H, respectively, and attaching the restraining means 1a and 1b to these, but is not limited to this.

[0016] For example, the present invention also covers a method in which the case 9 is initially formed so that both ends of the opening 9H have raised portions and the restraining means 1a, etc. are attached to these raised portions, or a method in which the raised portions themselves serve as the restraining means 1a, etc. Furthermore, even when an adapter 2a, etc. is used, the present invention does not exclude a method in which the adapter 2a, etc. is originally equipped with the restraining means 1a, etc. and this is attached to the ends of the opening 9H.

[0017] The restraining means 1a, 1b of the present vibration damping structure 3 can be provided with shock absorbing or cushioning properties. With this configuration, the impact of a collision between the detection plate 4 and the restraining means 1a, etc. is alleviated, and fatigue or fatigue damage to both can be prevented or the possibility of such damage can be reduced. As a material having shock absorbing or cushioning properties, a suitable material such as a foam such as polystyrene foam can be used.

[0018] Furthermore, the restraining means 1a, 1b of the present vibration damping structure 3 can be made of elastic means, i.e., elastic bodies. As the elastic bodies, those made of elastic materials such as synthetic rubber or resin, or elastic structures such as springs can be used as appropriate. When using a material with shock absorbing or buffering properties or elastic means (elastic body) as the restraining means 1a, etc., it is preferable to use an adapter 2a, etc. as its base. Furthermore, the adapter 2a, etc. should be formed and installed with a strength sufficient to withstand repeated collisions with the detection plate 4.

[0019] The stopping means 1a, etc. are arranged in positions where they come into contact with the detection plate 4 when the clutch is switched. In particular, when the above-mentioned elastic body or an object having a shock absorbing function is used as the stopping means 1a, etc., the stopping means 1a, etc. comes into contact with the detection plate 4 when the armature 5 is stopped, and the impact when the armature 5 reaches the switching target 7A, such as a meshing tooth, is absorbed by the elastic body, thereby achieving the effect of damping the vibration of the detection plate 4. At the same time, the buffering effect of the stopping means 1a, etc. can prevent fatigue and fatigue damage of the detection plate 4.

[0020] The electromagnetic clutch itself having the vibration damping structure described above is also within the scope of the present invention. [Example]

[0021] Fig. 3 is a hexagonal view of an adapter constituting an embodiment of the vibration damping structure of the present invention. Fig. 4 is a hexagonal view showing the adapter shown in Fig. 3 with a restraining means attached, and Fig. 5 is a hexagonal view of the embodiment of the vibration damping structure of the present invention. In this embodiment, elastic bodies are used as the restraining means 21a and 21b. When the vibration damping structure 23 of this embodiment having the configuration shown in each figure was applied to a detection plate 24 attached to the armature of an electromagnetic clutch, it was confirmed that vibrations due to impact when the clutch was switched did not occur, or, if they did occur, they were damped and stopped in an extremely short time, effectively preventing erroneous detection of the position and movement of the armature. [Industrial Applicability]

[0022] The electromagnetic clutch and vibration damping structure of the present invention can prevent erroneous detection of the armature position and operation of the electromagnetic clutch and prevent fatigue damage to the detection plate. Therefore, this invention is highly industrially applicable in the fields of electromagnetic clutch manufacturing and use, and all related technical and industrial fields. [Explanation of symbols]

[0023] 1a, 1b, 21a, 21b... restraining means 2a, 2b, 22a, 22b... adapter 3, 23...Vibration damping structure 4, 24...Detection plate 5...Armature 6...Coil spring 7A, 7B...Switching target (such as meshing teeth) 8...Electromagnet 9…Case 9H...Case opening 10...Electromagnetic clutch 74...Detection plate 75...Armature 76...Coil spring 77A, 77B...Switching target (such as meshing teeth) 78...Electromagnet 79…Case 79H…Case opening 710...Electromagnetic clutch M…Linear motion M'...recoil from impact V…Vibration

Claims

1. A structure for damping vibration of a detection plate for detecting the position of an armature constituting an electromagnetic clutch, a pair of restraining means provided on either side of the detection plate in the vibration direction of the detection plate, The stopping means stops the detection plate coming toward the stopping means. A vibration damping structure.

2. 2. The vibration damping structure according to claim 1, wherein the detection plate protrudes to the outside from an opening provided in a case that houses the electromagnetic clutch, and the restraining means is provided at an end of the opening.

3. 3. The vibration damping structure according to claim 1, wherein said restraining means has a shock absorbing or cushioning function.

4. 4. The vibration damping structure according to claim 3, wherein said restraining means is made of an elastic material.

5. An electromagnetic clutch comprising the vibration damping structure according to claim 3.

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