Electromagnetic clutch

Abstract

The embodiment of the invention provides an electromagnetic clutch. The electromagnetic clutch comprises a coil assembly, a first push ring, an input gear, an output gear and a positioning piece. The coil assembly is used for generating thrust when powered on so that the first push ring can move in the axial direction, and the first push ring is used for pushing the input gear to move in the axial direction so as to be meshed with the output gear. The positioning piece is arranged in the first push ring in a sleeved mode, and the positioning piece is used for locking the input gear after the coil assembly is powered off so that the input gear and the output gear can be kept in an engaged state or a separated state. According to the electromagnetic clutch provided by the embodiment of the invention, the positioning piece is arranged, so that the input gear and the output gear can still be kept in a meshed state or a separated state after the coil assembly is powered off in the process from opening to closing or from closing to opening of the clutch. Compared with the technical scheme that the coil assembly needs to be electrified all the time to keep the acting force in the prior art, the electromagnetic clutch provided by the embodiment of the invention has the advantages that more efficiency can be saved, and energy consumption is reduced.

Description

Technical Field

[0001] This application relates to the technical field of clutches, and particularly to an electromagnetic clutch. Background Art

[0002] The electromagnetic clutch in the prior art generates magnetism by energizing an electromagnetic valve to engage the input gear and the output gear to transmit power. During the process of the clutch opening or closing, continuous power supply to the electromagnetic valve is required to generate a force, which continuously consumes energy. Summary of the Invention

[0003] In view of this, this application provides an electromagnetic clutch to solve the technical problem of continuous energy consumption in the prior art during the process of the clutch opening or closing.

[0004] An embodiment of this application provides an electromagnetic clutch, which includes a coil assembly, a first push ring, an input gear, an output gear, and a positioning member.

[0005] The coil assembly is used to generate a thrust when energized, so that the first push ring moves axially.

[0006] The first push ring is used to push the input gear to move axially, so as to engage with the output gear.

[0007] The positioning member is sleeved inside the first push ring. After the coil assembly is de-energized, the positioning member is used to lock the input gear, so that the input gear and the output gear maintain an engaged state or a separated state.

[0008] In a possible implementation manner, the positioning member is provided with a first helical tooth.

[0009] One end of the input gear facing away from the output gear is provided with a second helical tooth.

[0010] The first helical tooth is used to lock with the second helical tooth after the coil assembly is de-energized.

[0011] In a possible implementation manner, the first push ring is provided with a third helical tooth.

[0012] The third helical tooth is used to cooperate with the second helical tooth to drive the first push ring to rotate circumferentially through tooth surface contact.

[0013] In a possible implementation manner, both the positioning member and the first push ring are cylindrical, and the positioning member and the first push ring are fixed circumferentially.

[0014] In a possible implementation manner, the electromagnetic clutch further includes:

[0015] A first bearing, the first bearing is sleeved in the positioning member and is used for sleeving on the main shaft.

[0016] In a possible implementation manner, the electromagnetic clutch further includes:

[0017] A first elastic member, the first elastic member is used for pushing the first push ring to move in the axial direction after the coil assembly is powered off.

[0018] In a possible implementation manner, the first elastic member is a wave spring, and the first elastic member is arranged between the positioning member and the first push ring in the axial direction.

[0019] In a possible implementation manner, the electromagnetic clutch further includes:

[0020] A support washer, sleeved between the input gear and the positioning member.

[0021] In a possible implementation manner, the electromagnetic clutch further includes:

[0022] A second push ring, sleeved between the coil assembly and the first push ring.

[0023] In a possible implementation manner, the electromagnetic clutch further includes:

[0024] A connecting member, the connecting member connects the positioning member and the first push ring in the circumferential direction.

[0025] The electromagnetic clutch provided by the embodiment of the present application, by arranging the positioning member, during the process of the clutch from being opened to being closed or from being closed to being opened, after the coil assembly is powered off, the input gear and the output gear can still be kept in the meshing state or the separated state. Compared with the prior art technical solution that requires the coil assembly to be continuously powered on to maintain the acting force, the electromagnetic clutch provided by the embodiment of the present application can save more efficiency and reduce the energy consumption. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0027] Figure 1 It is the front view of an electromagnetic clutch provided by the embodiment of the present application;

[0028] Figure 2The main cross-sectional view of an electromagnetic clutch provided by an embodiment of the present application;

[0029] Figure 3 The exploded view of an electromagnetic clutch provided by an embodiment of the present application;

[0030] Figure 4a The schematic diagram of the first state of an electromagnetic clutch provided by an embodiment of the present application during the process from open to closed;

[0031] Figure 4b The schematic diagram of the second state of an electromagnetic clutch provided by an embodiment of the present application during the process from open to closed;

[0032] Figure 4c The schematic diagram of the third state of an electromagnetic clutch provided by an embodiment of the present application during the process from open to closed;

[0033] Figure 4d The schematic diagram of the fourth state of an electromagnetic clutch provided by an embodiment of the present application during the process from open to closed;

[0034] Figure 4e The schematic diagram of the fifth state of an electromagnetic clutch provided by an embodiment of the present application during the process from open to closed;

[0035] Figure 4f The schematic diagram of the sixth state of an electromagnetic clutch provided by an embodiment of the present application during the process from open to closed;

[0036] Figure 5a The schematic diagram of the first state of an electromagnetic clutch provided by an embodiment of the present application during the process from closed to open;

[0037] Figure 5b The schematic diagram of the second state of an electromagnetic clutch provided by an embodiment of the present application during the process from closed to open;

[0038] Figure 5c The schematic diagram of the third state of an electromagnetic clutch provided by an embodiment of the present application during the process from closed to open;

[0039] Figure 5d The schematic diagram of the fourth state of an electromagnetic clutch provided by an embodiment of the present application during the process from closed to open;

[0040] Figure 5e The schematic diagram of the fifth state of an electromagnetic clutch provided by an embodiment of the present application during the process from closed to open;

[0041] Figure 5f The schematic diagram of the sixth state of an electromagnetic clutch provided by an embodiment of the present application during the process from closed to open.

[0042] Description of the reference numerals:

[0043] 1 - Coil assembly;

[0044] 2 - First push ring;

[0045] 201 - Third helical tooth;

[0046] 3 - Input gear;

[0047] 301 - Second helical tooth;

[0048] 4 - Output gear;

[0049] 5 - Positioning member;

[0050] 501 - First helical tooth;

[0051] 6 - First bearing;

[0052] 601 - First snap ring;

[0053] 7 - First elastic member;

[0054] 8 - Support washer;

[0055] 9 - Second push ring;

[0056] 10 - Connecting member;

[0057] 11 - Second bearing;

[0058] 110 - Second snap ring;

[0059] 12 - Second elastic member. Detailed implementation manners

[0060] For a better understanding of the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0061] It should be clear that the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0062] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. The singular forms of "a", "the" and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0063] In response to the above problems, the embodiments of this application provide an electromagnetic clutch, as Figure 1As shown in the figure, the electromagnetic clutch includes a coil assembly 1, a first push ring 2, an input gear 3, an output gear 4, and a positioning member 5. Among them, the input gear 3 is used for introducing and transmitting torque, and is provided with dog teeth thereon, which engage with the output gear 4. The output gear 4 is connected to a spline and is used for outputting torque to a transmission case.

[0064] As Figure 2 shown in the figure, the electromagnetic clutch may further include a second push ring 9. Among them, after the coil assembly 1 is energized, an electromagnetic field can be generated. Under the action of the electromagnetic field, the second push ring 9 generates a thrust to push the second push ring 9 to move, and the second push ring 9 drives the first push ring 2 to move axially. The first push ring 2 is sleeved inside the second push ring 9.

[0065] The first push ring 2 is used to push the input gear 3 to move axially, so as to engage with the output gear 4.

[0066] Please refer to Figure 1 and Figure 2 simultaneously. The positioning member 5 is sleeved inside the first push ring 2. The positioning member 5 is used to lock the input gear 3 after the coil assembly 1 is powered off, so that the input gear 3 maintains an engaged state or a separated state with the output gear 4.

[0067] For the electromagnetic clutch provided by the embodiment of the present application, by providing the positioning member 5, during the process of the clutch from being opened to being closed or from being closed to being opened, after the coil assembly 1 is powered off, the input gear 3 and the output gear 4 can still be maintained in an engaged state or a separated state. Compared with the prior art in which the coil assembly 1 needs to be continuously energized to maintain the acting force, the electromagnetic clutch provided by the embodiment of the present application can save more efficiency and reduce energy consumption.

[0068] Refer to Figure 3 . The positioning member 5 is provided with a first helical tooth 501. One end of the input gear 3 facing away from the output gear 4 is provided with a second helical tooth 301. Among them, the first helical tooth 501 is used to lock with the second helical tooth 301 after the coil assembly 1 is powered off. In this embodiment, the first helical tooth 501 can be directly machined on the positioning member 5, and the second helical tooth 301 can be directly machined on the input gear 3. Through the cooperation of the first helical tooth 501 and the second helical tooth 301, the input gear 3 and the positioning member 5 can be locked. After the coil assembly 1 is powered off, the input gear 3 can still be positioned under the action of the component force of the helical tooth surface, so as to maintain an engaged state or a separated state with the output gear 4.

[0069] As Figure 3 shown in the figure, in a specific implementation manner, the first push ring 2 is provided with a third helical tooth 201, and the third helical tooth 201 is used to cooperate with the second helical tooth 301 to drive the first push ring 2 to rotate circumferentially through tooth surface contact.

[0070] In this embodiment, the functions of the first push ring 2 and the third helical tooth 201 are that, before the first helical tooth 501 is locked with the second helical tooth 301, the third helical tooth 201 cooperates with the second helical tooth 301 first under the action of electromagnetic force. As the first push ring 2 continues to move forward axially, due to the action of tooth surface mating, the first push ring 2 will rotate circumferentially. Since the first push ring 2 and the positioning member 5 can be relatively fixed in the circumferential direction, the positioning member 5 also rotates circumferentially. After the coil assembly 1 is powered off, the first push ring 2 will slightly move away from the input gear 3, that is to say, the third helical tooth 201 will disengage from the second helical tooth 301. Due to the action of the tooth surface contact component force, the positioning member 5 rotates circumferentially, causing the first helical tooth 501 to contact and lock with the second helical tooth 301. The specific working process will be described in detail below.

[0071] Please continue to refer to Figure 3 , the positioning member 5 and the first push ring 2 can both be cylindrical. As mentioned above, the positioning member 5 and the first push ring 2 can be fixed in the circumferential direction. Also refer to Figure 2 , the positioning member 5 is sleeved inside the first push ring 2, and both can move circumferentially along the main shaft, so as to cooperate with the second helical tooth 301 on the input gear 3.

[0072] On the basis of the above embodiment, the electromagnetic clutch may further include a first bearing 6. The first bearing 6 is sleeved inside the positioning member 5, and the first bearing 6 is used to be sleeved on the main shaft. The first bearing 6 can support the positioning member 5. The first bearing 6 can be a bearing with a snap ring 601, which can play the role of axial restraint and rotation isolation.

[0073] Further, the electromagnetic clutch further includes a first elastic member 7. The first elastic member 7 is used to push the first push ring 2 to move axially after the coil assembly 1 is powered off. In a specific embodiment, the first elastic member 7 is a wave spring. Axially, the first elastic member 7 is arranged between the positioning member 5 and the first push ring 2.

[0074] Further, the electromagnetic clutch further includes a support washer 8, which is sleeved between the input gear 3 and the positioning member 5 to play a supporting role.

[0075] In a possible embodiment, the electromagnetic clutch further includes a second push ring 9. The second push ring 9 is sleeved between the coil assembly 1 and the first push ring 2. The function of the second push ring 9 is to move axially under the action of the magnetic field after the coil assembly 1 is powered on, driving the first push ring 2 to move axially.

[0076] Refer to Figure 3, the electromagnetic clutch further includes a connecting member 10. The connecting member 10 connects the positioning member 5 and the first push ring 2 in the circumferential direction. The connecting member 10 can specifically be a pin to fix the positioning member 5 and the first push ring 2 circumferentially.

[0077] Refer to Figure 3 , the electromagnetic clutch provided by the embodiment of the present application may further include a second bearing 11 sleeved inside the output gear 4. The second bearing 11 can be a bearing with a second snap ring 110, which can play a role in axial constraint and rotational isolation.

[0078] The electromagnetic clutch may further include a second elastic member 12 disposed between the input gear 3 and the output gear 4 for providing a return force to the input gear 3. The second elastic member 12 can be a helical spring.

[0079] The working process of the electromagnetic clutch from being opened to being closed, and the working process of the electromagnetic clutch from being closed to being opened will be specifically described below.

[0080] I. Working process of the electromagnetic clutch from being opened to being closed:

[0081] Step 1: As Figure 4a shown, the clutch is in the open state. At this time, the input gear 3 and the output gear 4 are in a separated state, and the coil assembly 1 is in a power-off state. The first push ring 2 is not in contact with the input gear 3. At this time, the third helical tooth 201 on the first push ring 2 is not in contact with the second helical tooth 301 on the input gear 3.

[0082] Step 2: As Figure 4b shown, the coil assembly 1 is powered on. Under the magnetic induction effect, the coil assembly 1 generates a thrust to push the first push ring 2 to move axially until it contacts the input gear 3. At this time, the third helical tooth 201 on the first push ring 2 starts to contact the second helical tooth 301 on the input gear 3.

[0083] Step 3: As Figure 4c shown, the first push ring 2 continues to move axially, pushing the input gear 3 to move circumferentially, and the input gear 3 and the output gear 4 are fully and tightly meshed.

[0084] Step 4: As Figure 4d shown, under the tooth surface fit of the third helical tooth 201 and the second helical tooth 301, the component force of the tooth surface contact causes the first push ring 2 and the positioning member 5 to rotate circumferentially together until the third helical tooth 201 of the first push ring 2 locks with the second helical tooth 301 of the input gear 3. At the same time, the input gear 3 axially retracts a very small distance but remains in meshed with the output gear 4.

[0085] Step 5: As Figure 4eAs shown, when the coil assembly 1 is powered off, the first push ring 2 leaves the input gear 3 under the action of the first elastic member 7. The second helical tooth 301 of the input gear 3 contacts the first helical tooth 501 of the positioning member 5, and then the positioning member 5 and the first push ring 2 rotate together circumferentially under the tooth surface engagement of the first helical tooth 501 and the second helical tooth 301.

[0086] Step 6: As Figure 4f shown, the positioning member 5 and the first push ring 2 rotate continuously circumferentially relative to the input gear 3 under the tooth surface engagement of the first helical tooth 501 and the second helical tooth 301 until the first helical tooth 501 of the positioning member 5 and the second helical tooth 301 of the input gear 3 are locked. At the same time, the input gear 3 retracts axially by a very small distance. At this time, the clutch is in the closed state when the coil assembly 1 is not powered on.

[0087] II. Working process of the electromagnetic clutch from closed to open:

[0088] Step 1: As Figure 5a shown, the clutch is in the closed state. At this time, the input gear 3 and the output gear 4 are in the meshed state, and the coil assembly 1 is in the powered-off state. The first push ring 2 does not contact the input gear 3, that is, the third helical tooth 201 does not contact the second helical tooth 301. The second helical tooth 301 of the input gear 3 contacts the first helical tooth 501 of the positioning member 5.

[0089] Step 2: As Figure 5b shown, when the coil assembly 1 is powered on, under the magnetic induction effect, the coil assembly 1 generates a thrust to push the first push ring 2 to move axially, contact the input gear 3 and push the input gear 3 to move axially until the input gear 3 and the output gear 4 are fully tightly meshed.

[0090] Step 3: As Figure 5c shown, the first push ring 2 continues to move axially, pushing the input gear 3 away from the positioning member 5. Then, the first push ring 2 and the positioning member 5 rotate circumferentially relative to the input gear 3 together. At the same time, the input gear 3 begins to retract axially by a very small distance but remains in the meshed state with the output gear 4.

[0091] Step 4: As Figure 5d shown, the first push ring 2 and the positioning member 5 rotate circumferentially together until the third helical tooth 201 of the first push ring 2 is locked with the second helical tooth 301 of the input gear 3. At the same time, the input gear 3 continues to retract axially by a distance.

[0092] Step 5: As Figure 5eAs shown, when the coil assembly 1 is powered off, the first push ring 2 leaves the input gear 3 under the action of the first elastic member 7. At this time, the second helical tooth 301 of the input gear 3 contacts the first helical tooth 501 of the positioning member 5.

[0093] Step 6: As Figure 5f shown, the positioning member 5 and the first push ring 2 rotate continuously circumferentially relative to the input gear 3 under the tooth surface engagement of the first helical tooth 501 and the second helical tooth 301 until the first helical tooth 501 of the positioning member 5 and the second helical tooth 301 of the input gear 3 are locked. At the same time, the input gear 3 continues to move axially until the input gear 3 and the output gear 4 are separated. At this time, the clutch is in the open state when the coil assembly 1 is not powered on.

[0094] In summary, after the coil assembly 1 of the electromagnetic clutch provided in the embodiment of the present application is powered off, the input gear 3 and the output gear 4 can still be kept in the engaged state or the separated state. Compared with the prior art in which the coil assembly 1 needs to be continuously powered on to maintain the acting force, the electromagnetic clutch provided in the embodiment of the present application can save more efficiency and reduce the energy consumption.

[0095] The structure, features and effects of the present application have been described in detail based on the embodiments shown in the drawings. The above is only the preferred embodiment of the present application, but the present application is not limited to the scope defined by the drawings. Any changes made according to the concept of the present application, or equivalent embodiments modified into equivalent changes, still within the spirit covered by the description and the drawings, shall be within the protection scope of the present application.

Claims

1. An electromagnetic clutch, characterized in that, it includes a coil assembly (1), a first push ring (2), an input gear (3), an output gear (4) and a positioning member (5); the coil assembly (1) is used to generate a thrust when energized, so that the first push ring (2) moves axially; the first push ring (2) is used to push the input gear (3) to move axially, so as to engage with the output gear (4); the positioning member (5) is sleeved in the first push ring (2), and the positioning member (5) is used to lock the input gear (3) after the coil assembly (1) is powered off, so that the input gear (3) and the output gear (4) remain in an engaged state or a separated state.

2. The electromagnetic clutch according to claim 1, characterized in that: a first helical tooth (501) is provided on the positioning member (5); a second helical tooth (301) is provided at one end of the input gear (3) facing away from the output gear (4); the first helical tooth (501) is used to lock with the second helical tooth (301) after the coil assembly (1) is powered off.

3. The electromagnetic clutch according to claim 2, characterized in that: a third helical tooth (201) is provided on the first push ring (2); the third helical tooth (201) is used to cooperate with the second helical tooth (301) to drive the first push ring (2) to rotate circumferentially through tooth surface contact.

4. The electromagnetic clutch according to claim 3, characterized in that, both the positioning member (5) and the first push ring (2) are cylindrical, and the positioning member (5) and the first push ring (2) are fixed circumferentially.

5. The electromagnetic clutch according to claim 4, characterized in that, the electromagnetic clutch further includes: a first bearing (6), the first bearing (6) is sleeved in the positioning member (5) and is used to be sleeved on the main shaft.

6. The electromagnetic clutch according to any one of claims 1-5, characterized in that, the electromagnetic clutch further includes: a first elastic member (7), the first elastic member (7) is used to push the first push ring (2) to move axially after the coil assembly (1) is powered off.

7. The electromagnetic clutch according to claim 6, characterized in that, the first elastic member (7) is a wave spring, and the first elastic member (7) is axially arranged between the positioning member (5) and the first push ring (2).

8. The electromagnetic clutch according to any one of claims 1-5, characterized in that, the electromagnetic clutch further includes: a support washer (8), sleeved between the input gear (3) and the positioning member (5).

9. The electromagnetic clutch according to any one of claims 1-5, characterized in that, the electromagnetic clutch further includes: a second push ring (9), sleeved between the coil assembly (1) and the first push ring (2).

10. The electromagnetic clutch according to any one of claims 1-5, characterized in that, the electromagnetic clutch further includes: Connecting piece (10), the connecting piece (10) connecting the positioning piece (5) and the first pushing ring (2) in the circumferential direction.

Images