An electromagnetic clutch

Abstract

The present invention provides an electromagnetic clutch, comprising a rotating disk, an output gear, a butterfly spring, an armature, a housing, a coil, a first retaining spring, and a second retaining spring. The rotating disk comprises a hollow shaft and a disk body, the disk body being sleeved on the hollow shaft and integrally formed. A plurality of waist-shaped heat dissipation holes are uniformly formed along the circumference of the upper end surface of the disk body, dividing the upper end surface of the disk body into a first friction ring and a second friction ring. An annular heat dissipation groove is formed along the circumference of the upper end surface where the disk body and the hollow shaft meet. The upper end of the hollow shaft is engaged with the output gear, and a butterfly spring is fixed to the lower end surface of the output gear and riveted to the armature. The lower end of the hollow shaft is mounted in the housing, and a coil frame is provided within the housing. The coil is wound within the coil frame, and the lead wire of the coil passes through the housing and is connected to a power source. The present invention solves the problems of current low-torque electromagnetic clutches, such as large size, high cost, and poor heat dissipation, and has the advantages of miniaturization, low cost, and good heat dissipation.

Description

Technical Field

[0001] The present invention belongs to the technical field of clutches, and in particular relates to an electromagnetic clutch. Background Art

[0002] An electromagnetic clutch, also known as an electromagnetic coupling, is an automatically actuated electrical device that uses the principles of electromagnetic induction and the friction between inner and outer friction plates to allow the driven component to engage or disengage with the active component while the active component continues to rotate.

[0003] With the rise of smart homes in China and the continuous development of new energy vehicles such as electric vehicles, the demand and application of various intelligent and miniaturized actuators are becoming more and more extensive. As an electromagnetic clutch that transmits the torque (or power) of the actuator from the driving shaft to the driven shaft, it is widely used in various transmission mechanisms and various electric mechanisms to achieve functions such as fast starting, braking, forward and reverse rotation or speed regulation. Since the electromagnetic clutch is easy to achieve remote control and is much simpler to operate than other mechanical, hydraulic or pneumatic clutches, it has become an important component in the automatic control system.

[0004] Given the current market trend toward lightweight, miniaturized, and energy-efficient products, existing electromagnetic clutches are relatively large in both overall dimensions and height. A typical electromagnetic clutch with a torque of approximately 0.6 Nm is 43 mm tall, and the overall actuator dimensions exceed 63 mm. This increases the overall actuator size and fails to meet the needs of customers with limited space requirements. Furthermore, due to the relatively high starting voltage and resulting heat generation, the heat generated within the precision actuator components significantly impacts the reliability and noise of the transmission gear mechanism. Furthermore, the high procurement cost of conventional electromagnetic clutches places significant pressure on the widespread use of these actuators. Therefore, the development of a compact, low-cost electromagnetic clutch with excellent heat dissipation has become a pressing need. Summary of the Invention

[0005] In view of this, the present invention aims to propose an electromagnetic clutch that solves the problems of the current small-torque electromagnetic clutch being relatively large in size, relatively high in cost and relatively poor in heat dissipation, and has the advantages of miniaturization, low cost and good heat dissipation.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] An electromagnetic clutch comprises a rotating disk, an output gear, a butterfly spring, an armature, a housing, a coil, a first retaining spring and a second retaining spring. The rotating disk comprises a hollow shaft and a disk body, the disk body is sleeved on the hollow shaft, and the disk body and the hollow shaft are integrally formed. A plurality of waist-shaped heat dissipation holes are evenly provided on the upper end surface of the disk body along the circumferential direction, and the upper end surface of the disk body is divided into a first friction ring and a second friction ring. An annular heat dissipation groove is provided on the upper end surface of the disk body and the hollow shaft at the matching position along the circumferential direction. The upper end of the hollow shaft is matched with the output gear and is limited by the second retaining spring. A butterfly spring is fixed to the lower end face of the wheel, and the butterfly spring is riveted to the armature. The armature is sleeved on the hollow shaft, and a gap is provided between the armature and the upper end face of the disk body. The lower end of the hollow shaft is inserted into the outer shell, and a second shaft sleeve and a first shaft sleeve are provided in sequence from top to bottom at the matching position of the outer shell and the hollow shaft, and the upper end face of the second shaft sleeve is abutted against the lower end face of the disk body, and the lower part of the first shaft sleeve supports the bottom of the outer shell and is limited by the first retaining spring; a coil frame is provided inside the outer shell, and the coil is wound in the annular space of the coil frame, and the lead wire of the coil passes through the outer shell and is connected to the power supply.

[0008] Furthermore, the plurality of waist-shaped heat dissipation holes are arranged away from the hollow shaft.

[0009] Furthermore, the depth of the waist-shaped heat dissipation hole is three quarters of the thickness of the disk body.

[0010] Furthermore, the depth of the annular heat dissipation groove is smaller than the depth of the waist-shaped heat dissipation hole.

[0011] Furthermore, three waist-shaped heat dissipation holes are provided, and the total area of ​​the three waist-shaped heat dissipation holes accounts for 5 / 6-6 / 7 of the area of ​​the circular groove where the three waist-shaped heat dissipation holes are located.

[0012] Furthermore, an annular retaining groove is provided at the upper and lower parts of the hollow shaft where they cooperate with the corresponding retaining springs.

[0013] Furthermore, the interior of the hollow shaft cooperates with the intermediate shaft.

[0014] Furthermore, a limiting edge is provided at the lower end of the first sleeve and the upper end of the second sleeve respectively.

[0015] Compared with the prior art, the electromagnetic clutch described in the present invention has the following advantages:

[0016] This application has the advantages of small size and light weight, good response performance, no noise, good heat dissipation, compact structure, stable torque, no no-load loss, easy and simple installation and operation, and low cost. It can be promoted and applied to various types of automobile or household precision actuators or precision transmission components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a schematic structural diagram of an electromagnetic clutch according to an embodiment of the present invention;

[0019] Figure 2 This is a left side view of an electromagnetic clutch according to an embodiment of the present invention;

[0020] Figure 3 This is a right side view of an electromagnetic clutch according to an embodiment of the present invention;

[0021] Figure 4 It is a structural diagram of the rotating disk;

[0022] Figure 5 It is the left view of the rotating disk;

[0023] Figure 6 This is the right side view of the rotating disk.

[0024] Description of reference numerals:

[0025] 1-intermediate shaft; 2-rotating disk; 201-hollow shaft; 202-disc body; 3-output gear; 4-disc spring; 5-armature; 6-housing; 7-coil; 8-coil frame; 9-first sleeve; 10-first retaining spring; 11-second sleeve; 12-second retaining spring; 13-lead wire, 14-first friction ring, 15-second friction ring, 16-waist-shaped heat dissipation hole, 17-annular heat dissipation groove, 18-annular slot. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] like Figures 1-6As shown, an electromagnetic clutch includes a rotating disk 2, an output gear 3, a butterfly spring 4, an armature 5, a housing 6, a coil 7, a first retaining spring 10 and a second retaining spring 12. The rotating disk 2 includes a hollow shaft 201 and a disk body 202. The disk body 202 is sleeved on the hollow shaft 201, and the disk body 202 and the hollow shaft 201 are integrally formed. A plurality of waist-shaped heat dissipation holes 16 are evenly provided on the upper end surface of the disk body 202 along the circumferential direction, and the upper end surface of the disk body 202 is divided into a first friction ring 14 and a second friction ring 15. An annular heat dissipation groove 17 is provided on the upper end surface of the disk body 202 at the matching position with the hollow shaft 201 along the circumferential direction. The upper end of the hollow shaft 201 is matched with the output gear 3 and is connected to the output gear 3 through the second retaining spring. 12 limit, a butterfly spring 4 is fixed on the lower end face of the output gear 3, the butterfly spring 4 is riveted on the armature 5, the armature 5 is sleeved on the hollow shaft 201, and a gap is provided between the armature 5 and the upper end face of the disk 202, the lower end of the hollow shaft 201 is installed in the outer shell 6, and a second shaft sleeve 11 and a first shaft sleeve 9 are provided in sequence from top to bottom at the matching position of the outer shell 6 and the hollow shaft 201, and the upper end face of the second shaft sleeve 11 is against the lower end face of the disk 202, the lower part of the first shaft sleeve 9 supports the bottom of the outer shell 6 and is limited by the first retaining spring 10; a coil frame 8 is provided inside the outer shell 6, the coil 7 is wound in the annular space of the coil frame 8, and the lead wire 13 of the coil 7 passes through the outer shell 6 and is connected to the power supply.

[0029] Several waist-shaped heat dissipation holes 16 are arranged away from the hollow shaft 201; the depth of the waist-shaped heat dissipation holes 16 is three-quarters of the thickness of the disk body 202; the depth of the annular heat dissipation groove 17 is less than the depth of the waist-shaped heat dissipation holes 16; three waist-shaped heat dissipation holes 16 are provided, and the total area of ​​the three waist-shaped heat dissipation holes 16 accounts for 5 / 6-6 / 7 of the area of ​​the annular groove where the three waist-shaped heat dissipation holes are located. Since the friction ring mode is adopted for torque transmission, it is easier to accurately control the torque range than the entire friction plate. When the groove is not provided, the upper end surface of the disk body 202 is all friction surface. The total area of ​​the friction ring on the end surface of the disk body is changed by changing the size and number of the heat dissipation grooves provided on the upper end surface of the disk body, thereby controlling the torque. At the same time, the electromagnetic clutch of the present application can be started with a DC voltage of 12V, and can be used in actuator components in various low-voltage working environments.

[0030] By matching the upper end of the rotating disk 2 with the output gear 3, and installing its lower end into the housing 6, a first shaft sleeve 9 is provided at the lower end of the rotating disk 2 and the housing 6, and a second shaft sleeve 11 is provided at the upper end of the matching. Under the action of the first retaining spring 10, the magnetic ring part of the electromagnetic clutch is fastened to the rotating disk 2; because the rotating disk 2 tightly matches the output gear 3 and the housing 6, such an arrangement can reduce the overall height of the electromagnetic clutch to between 20-30mm, reduce the overall size, and achieve a compact structure to meet the customer's limited space requirements.

[0031] An annular retaining groove 18 is provided at the upper and lower parts of the hollow shaft 201 where they cooperate with the corresponding retaining springs, which is easy to install and has a good limiting effect.

[0032] The interior of the hollow shaft 201 cooperates with the intermediate shaft 1, and can be installed between the upper and lower housings of the actuator through the intermediate shaft 1, serving as a transmission link and protecting the entire transmission group under normal working load.

[0033] A limiting edge is provided at the lower end of the first shaft sleeve 9 and the upper end of the second shaft sleeve 11 , respectively, for supporting and limiting the rotating disk 2 and supporting the housing 6 .

[0034] The working process of this application is as follows:

[0035] When current flows through the lead wire 13 of the coil and the DC voltage reaches 12V, the electromagnetic clutch reaches normal operating state. At this time, the coil 7 is energized to generate magnetic flux force to attract the armature 5, causing the butterfly spring 4 connected to the armature 5 to deform. The armature 5 and the friction ring on the rotating disk 2 are tightly fitted together. The torque on the rotating disk 2 can be transmitted to other transmission mechanisms through the output gear 3. When the transmission mechanism requires an output torque greater than the set torque of the armature 5 and the friction ring on the rotating disk 2, the output gear 3 drives the armature 5 and the rotating disk 2 to rotate relative to each other. The heat generated by friction can be dissipated outward through the waist-shaped heat dissipation holes 16 and annular heat dissipation grooves 17 provided on the rotating disk 2, protecting the transmission mechanism from operating at normal operating temperature and rated torque.

[0036] When the power is off, that is, when no current flows through the lead wire 13, the magnetic force disappears, and the armature 5 rebounds to its original position under the elastic force of the butterfly spring 4. The clutch is in a disengaged state. At this time, the output gear 3 and the rotating disk 2 can move relative to each other, but no torque is transmitted.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electromagnetic clutch, characterized in that: The invention comprises a rotating disk (2), an output gear (3), a butterfly spring (4), an armature (5), a housing (6), a coil (7), a first retaining spring (10) and a second retaining spring (12); the rotating disk (2) comprises a hollow shaft (201) and a disk body (202); the disk body (202) is sleeved on the hollow shaft (201), and the disk body (202) and the hollow shaft (201) are integrally formed; a plurality of waist-shaped heat dissipation holes (16) are uniformly provided on the upper end surface of the disk body (202) along the circumferential direction; the upper end surface of the disk body (202) is divided into a first friction ring (14) and a second friction ring (15); an annular heat dissipation groove (17) is provided on the upper end surface of the matching portion between the disk body (202) and the hollow shaft (201) along the circumferential direction; the upper end of the hollow shaft (201) matches the output gear (3) and is limited by the second retaining spring (12); A butterfly spring (4) is fixed on the lower end surface of the output gear (3), and the butterfly spring (4) is riveted on the armature (5). The armature (5) is sleeved on the hollow shaft (201), and a gap is provided between the armature (5) and the upper end surface of the disk body (202). The lower end of the hollow shaft (201) is installed in the shell (6). A second shaft sleeve (11) and a first shaft sleeve (9) are provided in sequence from top to bottom at the matching position between the shell (6) and the hollow shaft (201), and the upper end surface of the second shaft sleeve (11) is against the lower end surface of the disk body (202). The lower part of the first shaft sleeve (9) supports the bottom of the shell (6) and is limited by the first retaining spring (10); a coil frame (8) is provided inside the shell (6), and the coil (7) is wound in the annular space of the coil frame (8). The lead wire (13) of the coil (7) passes through the shell (6) and is connected to the power supply.

2. The electromagnetic clutch according to claim 1, characterized in that: The plurality of waist-shaped heat dissipation holes (16) are arranged away from the hollow shaft (201).

3. The electromagnetic clutch according to claim 1, characterized in that: The depth of the waist-shaped heat dissipation hole (16) is three quarters of the thickness of the disk body (202).

4. The electromagnetic clutch according to claim 3, characterized in that: The depth of the annular heat dissipation groove (17) is smaller than the depth of the waist-shaped heat dissipation hole (16).

5. The electromagnetic clutch according to claim 1, characterized in that: Three waist-shaped heat dissipation holes (16) are provided, and the total area of ​​the three waist-shaped heat dissipation holes (16) accounts for 5 / 6-6 / 7 of the area of ​​the circular groove where the three waist-shaped heat dissipation holes are located.

6. The electromagnetic clutch according to claim 1, characterized in that: An annular clamping groove (18) is provided at the upper and lower parts of the hollow shaft (201) where they cooperate with the corresponding clamping springs.

7. The electromagnetic clutch according to claim 1, characterized in that: The interior of the hollow shaft (201) is matched with the intermediate shaft (1).

8. The electromagnetic clutch according to claim 1, characterized in that: A limiting edge is provided at the lower end of the first shaft sleeve (9) and the upper end of the second shaft sleeve (11), respectively.

Images