Electromagnetic clutch structure

Abstract

The utility model discloses an electromagnetic clutch structure which comprises an input shaft, an electromagnetic coil, a driving joint tooth and an output tooth are coaxially and sequentially arranged on the input shaft, a push ring assembly is arranged between the electromagnetic coil and the input shaft, and a return spring is arranged between the driving joint tooth and the output tooth. And part abrasion can be improved, and joint impact noise is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of electromagnetic clutches. Specifically, the utility model relates to a structure of an electromagnetic clutch. Background Technique

[0002] With the improvement of the country's requirements for vehicle emissions, hybrid technology has been greatly developed. Hybrid technology requires a transmission to achieve different power switches or hybrid power output. Therefore, relevant mechanisms are needed to achieve this goal, and electromagnetic clutches have come into being accordingly.

[0003] Between the components of the electromagnetic clutch, power conduction is usually carried out through the cooperation of gears under the action of magnetic force. When the gears are engaged, some components are rotating at high speed, so wear between parts will occur, affecting the service life of the product. At the same time, noise generated by impact will also occur during the moment of gear engagement.

[0004] The utility model patent with the publication number of CN213685034U was published on July 13, 2021, with the name of an electromagnetic clutch for automotive supercharger. Its coil includes a housing, a coil frame, and an enameled wire wound around the coil frame. Multiple connecting pieces are arrayed on the top of the coil frame and are connected to the top of the housing through the connecting pieces. There is a concave hole inside the lower end of the coil frame, and a bearing is fixed in the concave hole. It also includes a bottom cover, which is fixed at the bottom of the housing. The bottom cover limits the bottom of the coil frame and the bearing. A pair of injection holes are symmetrically arranged on the outside of the housing. This electromagnetic clutch for automotive supercharger also cannot solve the technical problems described above. Content of the Utility Model

[0005] The purpose of the utility model is to provide an electromagnetic clutch structure that improves part wear and reduces the impact noise during engagement in view of the deficiencies of the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] This electromagnetic clutch structure includes an input shaft, on which an electromagnetic coil, a driving engaging tooth, and an output tooth are coaxially arranged in sequence. A push ring assembly is arranged between the electromagnetic coil and the input shaft, and a return spring is arranged between the driving engaging tooth and the output tooth.

[0008] The electromagnetic coil includes a copper wire winding and a housing, and the copper wire winding is fixed inside the housing; the push ring assembly includes an iron core and a spacer sleeve, and the iron core is press-fitted on the spacer sleeve; the iron core is in inner diameter fit with the housing, and the spacer sleeve is sleeved on the input shaft.

[0009] The outer ring of the active engagement gear is provided with an external spline, and the inner ring of the active engagement gear is provided with an internal spline, and the internal spline is embedded and fitted with the input shaft; one side of the output gear close to the active engagement gear is provided with a spline matching the external spline.

[0010] A locking angle is provided on the external spline.

[0011] A limiting boss is provided at the end of the external spline.

[0012] A thrust bearing is provided between the active engagement gear and the push ring assembly.

[0013] An adjusting shim is also provided between the active engagement gear and the push ring assembly.

[0014] The utility model has the following technical effects:

[0015] 1. A thrust bearing is designed between the active engagement gear and the push ring assembly, which can prevent the relative rotation between the push ring assembly and the active engagement gear, improve the mutual wear between parts, and is beneficial to improving the service life of the product;

[0016] 2. The active engagement gear and the output gear are designed with a locking angle, which is beneficial to the engagement of the engagement gear, avoids the phenomenon of "tooth-to-tooth" of the dog teeth, and is beneficial to simplifying the control strategy of the electromagnetic clutch;

[0017] 3. The active engagement gear is designed with a limiting boss, and the engagement process between the active engagement gear and the output gear uses the boss for positioning, which can improve the engagement impact noise;

[0018] 4. The electromagnetic clutch controls the movement of the push ring assembly through electromagnetic force, thereby realizing the engagement and disconnection of the engagement gear, that is, the power transmission and interruption, and has the characteristics of fast response;

[0019] 5. An adjusting shim is designed between the active engagement gear and the push ring assembly, which can effectively control the axial clearance between the active engagement gear and the output gear, and is beneficial to the design of the electromagnetic clutch control strategy. Description of the Drawings

[0020] This specification includes the following drawings, and the shown contents are respectively:

[0021] Figure 1 is the structure of the electromagnetic clutch of the utility model;

[0022] Figure 2 is the schematic diagram of the electromagnetic coil structure of the utility model;

[0023] Figure 3 is the schematic diagram of the cross-section of the push ring assembly of the utility model;

[0024] Figure 4 is the schematic diagram of the structure of the active engagement gear of the utility model;

[0025] Figure 5 is a schematic diagram of the output tooth structure of the present utility model;

[0026] Figure 6-1 and Figure 6-2 is a schematic diagram of the engagement of the driving engagement tooth and the output tooth of the present utility model.

[0027] In the figure, the markings are: 1, electromagnetic coil; 11, copper wire winding; 12, outer shell; 2, push ring assembly; 21, iron core; 22, spacer sleeve; 3, adjusting gasket; 4, thrust bearing; 5, driving engagement tooth; 51, external spline; 511, locking angle; 512, limiting boss; 52, internal spline; 6, return spring; 7, output tooth; 71, spline; 72, gear positioning plane; 8, input shaft. Detailed implementation manners

[0028] The following further describes in detail the specific implementation manners of the present utility model with reference to the accompanying drawings through the description of the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitate its implementation.

[0029] As Figure 1 shown, the electromagnetic clutch structure includes an input shaft 8, on which an electromagnetic coil 1, a driving engagement tooth 5 and an output tooth 7 are coaxially arranged in sequence. A push ring assembly 2 is provided between the electromagnetic coil 1 and the input shaft 8, and a return spring 6 is provided between the driving engagement tooth 5 and the output tooth 7.

[0030] The driving engagement tooth 5 realizes axial sliding on the input shaft 8 through the internal spline 52. The electromagnetic clutch controls the movement of the push ring assembly 2 through electromagnetic force. After the electromagnetic coil 1 is energized, the push ring assembly 2 is pushed by the magnetic field of the electromagnetic coil 1 to axially slide the driving engagement tooth 5 until it is in gear engagement with the output tooth 7, transmitting the torque of the input shaft 8 to the output tooth 7, thereby realizing the engagement and disengagement of the engagement teeth. At the same time, the return spring 6 is in a compressed state. After the electromagnetic coil 1 is de-energized, the return spring 6 resets to push the push ring assembly 2 to reset, thereby controlling the power transmission and interruption.

[0031] As Figure 2 shown, the electromagnetic coil 1 includes a copper wire winding 11 and an outer shell 12, and the copper wire winding 11 is fixed inside the outer shell 12; the push ring assembly 2 includes an iron core 21 and a spacer sleeve 22, and the iron core 21 is press-fitted on the spacer sleeve 22; the iron core 21 is in internal diameter fit with the outer shell 12, and the spacer sleeve 22 is sleeved on the input shaft 8. The outer shell 12 is provided with a through hole, and the copper wire winding 11 is fixed in the through hole by bolts. The energization of the electromagnetic coil 1 realizes the axial movement of the push ring assembly 2, so as to achieve the purpose of axially sliding the driving engagement tooth 5 on the input shaft 8.

[0032] As Figure 4 andFigure 5 As shown in the figure, an external spline 51 is provided on the outer ring of the active engagement tooth 5, and an internal spline 52 is provided on the inner ring of the active engagement tooth 5. The internal spline 52 is embedded and fitted with the input shaft 8; a spline 71 matching the external spline 51 is provided on one side of the output tooth 7 close to the active engagement tooth 5. The internal spline 52 is used to cooperate with the input shaft 8 to realize the synchronous rotation of the active engagement tooth 5 and the input shaft 8. The external spline 51 is the contact structure between the active engagement tooth 5 and the output tooth 7. When the external spline 51 is engaged with the spline 71, the power of the input shaft 8 is transmitted to the output tooth 7, and when the two are separated, the power between the input shaft 8 and the output tooth 7 is disconnected.

[0033] As Figure 4 and Figure 6-1 shown in the figure, a locking angle 511 is provided on the external spline 51. The locking angle 511 structure makes the external spline 51 form an angular structure. Similarly, a locking angle structure is also made on the spline 71. The locking angle 511 increases the tooth groove width, reduces the tooth thickness, and improves the alignment probability of the tooth and the groove when the active engagement tooth 5 is engaged with the output tooth 7, thereby avoiding the "tooth-to-tooth" phenomenon with high probability, and thus realizing the easy combination characteristic.

[0034] As Figure 4 and Figure 6-2 shown in the figure, a limiting boss 512 is provided at the end of the external spline 51. A gear positioning plane 72 is provided on one side of the output tooth 7 close to the active engagement tooth 5. The gear positioning plane 72 corresponds to the limiting boss 512. There are three limiting bosses 512 arranged at equal intervals along the circumferential direction, and its outer diameter is larger than the outer diameter of the external spline 51. When the active engagement tooth 5 axially moves to a certain stroke, the plane of the limiting boss 512 is attached to the gear positioning plane 72 to realize the positioning function, thereby restricting the axial movement of the active engagement tooth 5, and thus reducing the impact noise during the engagement process. The above structure mainly improves the engagement noise by reducing the limiting contact area between the active engagement tooth 5 and the output tooth 7.

[0035] As Figure 1 shown in the figure, a thrust bearing 4 is further provided between the active engagement tooth 5 and the push ring assembly 2. The shaft ring of the thrust bearing 4 is fixed to the active engagement tooth 5, the seat ring of the thrust bearing 4 is fixed to the push ring assembly 2, and the roller assembly of the thrust bearing 4 forms an isolation between the active engagement tooth 5 and the push ring assembly 2 while satisfying the rotation of the active engagement tooth 5. Therefore, the thrust bearing 4 can prevent the push ring assembly 2 from rotating relative to the active engagement tooth 5, can improve the mutual wear between parts, and extend the service life.

[0036] As Figure 1 shown in the figure, an adjusting gasket 3 is further provided between the active engagement tooth 5 and the push ring assembly 2. An adjusting gasket 3 is designed between the active engagement tooth 5 and the push ring assembly 2 to control the axial clearance between the active engagement tooth 5 and the output tooth 7 by changing the number of gaskets or gaskets with different thicknesses.

[0037] The components on the input shaft 8 are assembled as follows: The output gear 7 is sleeved on the input shaft 8. A shaft sleeve and a rolling bearing are assembled between its inner hole and the outer circle of the input shaft 8. The output gear 7 can rotate freely. The axial position of the shaft sleeve end face is limited by a snap ring. The return spring 6 is assembled between the shaft sleeve and the active engagement gear 5 and can be axially compressed. The active engagement gear 5 is assembled on the input shaft 8 through spline 71 and can axially slide on the input shaft 8. A thrust bearing 4 and an adjusting shim 3 are assembled at the outer circle of the active engagement gear 5. The push ring assembly 2 and the electromagnetic coil 1 are assembled together through an inner diameter fit. The electromagnetic coil 1 is sleeved on the input shaft 8 and fixed to the housing by 3 bolts.

[0038] The working process of this electromagnetic clutch is as follows: Taking the hybrid products in the current automotive industry as an example, when the vehicle starts, the drive motor drives the gear for power transmission. The output gear 7 transmits the power to the wheels. When the vehicle speed reaches a certain value, the engine needs to participate in power output at this time. The vehicle sends an electromagnetic clutch engagement command and adjusts the speeds of the output gear 7 and the active engagement gear 5 so that their speed difference is controlled within 20 - 50 rpm. At this time, a constant current of 4 A is applied to the electromagnetic coil 1. Due to the electromagnetic field effect, the push ring assembly 2 is subjected to an axial suction force and moves axially on the input shaft 8.

[0039] Since the end face of the active engagement gear 5 is always in contact with the push ring assembly 2 under the action of the return spring 6, the active engagement gear 5 axially slides on the input shaft 8 through the spline 71 and further compresses the return spring 6 at the same time.

[0040] When the movement stroke of the active engagement gear 5 reaches a certain value, the limit boss 512 on it fits with the gear positioning plane 72. At this time, it moves to the end of the stroke and cannot continue to move axially. At this time, the spline 71 on it mates with the spline 71 on the output gear 7. At this time, the engine can achieve power output. The power transmission path is: engine → input shaft 8 → active engagement gear 5 → output gear 7.

[0041] After the active engagement gear 5 is completely engaged, the vehicle sends a holding command to the electromagnetic clutch and adjusts the input current of the electromagnetic coil 1 to 1 A. When the vehicle speed drops to a certain value, the motor needs to output power alone at this time. The vehicle sends a disconnection command to the electromagnetic clutch and cuts off the power supply of the electromagnetic coil 1. At this time, since the magnetic field of the coil disappears, the push ring assembly 2 is no longer subjected to the electromagnetic suction force of the electromagnetic coil 1, that is, the active engagement gear 5 is not subjected to the axial electromagnetic force thrust. It returns to its original position under the reset action of the return spring 6 and disconnects from the output gear 7, that is, interrupts the engine power transmission.

[0042] The electromagnetic clutch structure is designed with a thrust bearing 4 between the active engaging tooth 5 and the push ring assembly 2, which can avoid relative rotation between the push ring assembly 2 and the active engaging tooth 5, improve mutual wear between parts, and help to increase product service life; the active engaging tooth 5 and the output tooth 7 are designed with a locking angle 511, which is conducive to the engagement of the engaging teeth, avoids the "tooth-to-tooth" phenomenon of dog teeth, and is conducive to simplifying the electromagnetic clutch control strategy; the active engaging tooth is designed with a limited boss 512, and the boss is used to limit the engagement process of the active engaging tooth 5 and the output tooth 7, which can improve the engagement impact noise; the electromagnetic clutch controls the movement of the push ring assembly 2 by electromagnetic force, thereby realizing the engagement and disconnection of the engaging teeth, that is, power transmission and interruption, and has the characteristic of fast response; an adjustment gasket 3 is designed between the active engaging tooth 5 and the push ring assembly 2, which can effectively control the axial clearance between the active engaging tooth 5 and the output tooth 7, which is conducive to the design of the electromagnetic clutch control strategy.

[0043] The above description of the present invention is provided as an example, in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any application of the above-described concepts and technical solutions of the present invention to other situations without modification, are all within the scope of protection of the present invention.

Claims

1. An electromagnetic clutch structure, characterized in that: It includes an input shaft (8), on which an electromagnetic coil (1), a driving engagement tooth (5) and an output tooth (7) are coaxially arranged in sequence. A push ring assembly (2) is provided between the electromagnetic coil (1) and the input shaft (8), and a return spring (6) is provided between the driving engagement tooth (5) and the output tooth (7).

2. The electromagnetic clutch structure according to claim 1, characterized in that: The electromagnetic coil (1) includes a copper wire winding (11) and a housing (12), and the copper wire winding (11) is fixed in the housing (12); the push ring assembly (2) includes an iron core (21) and a spacer sleeve (22), and the iron core (21) is press-fitted on the spacer sleeve (22); the iron core (21) is in inner diameter fit with the housing (12), and the spacer sleeve (22) is sleeved on the input shaft (8).

3. The electromagnetic clutch structure according to claim 2, characterized in that: External splines (51) are provided on the outer ring of the driving engagement tooth (5), and internal splines (52) are provided on the inner ring of the driving engagement tooth (5), and the internal splines (52) are in interference fit with the input shaft (8); on the side of the output tooth (7) close to the driving engagement tooth (5), splines (71) matching the external splines (51) are provided.

4. The electromagnetic clutch structure according to claim 3, characterized in that: A locking angle (511) is provided on the external splines (51).

5. The electromagnetic clutch structure according to claim 4, characterized in that: A limiting boss (512) is provided at the end of the external splines (51).

6. The electromagnetic clutch structure according to any one of claims 1-5, characterized in that: A thrust bearing (4) is provided between the driving engagement tooth (5) and the push ring assembly (2).

7. The electromagnetic clutch structure according to claim 6, characterized in that: An adjusting gasket (3) is further provided between the driving engagement tooth (5) and the push ring assembly (2).

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