Electromagnetic tooth clutch structure

Abstract

The present invention relates to an electromagnetic tooth clutch structure, which belongs to the technical field of automobile clutches. The electromagnetic tooth clutch structure of the present invention comprises a shaft, a coil assembly, a push ring assembly, a clutch driving gear and a clutch passive gear; an annular accommodating space is formed between the coil assembly and the shaft, the push ring assembly is arranged in the annular accommodating space, the push ring outer ring contacts the inner end of the coil assembly, and the push ring inner ring contacts the outer periphery of the bearing; the push ring inner ring is adjacent to the clutch driving gear, and the clutch driving gear and the clutch passive gear are adjacent. When the coil assembly is energized, an electromagnetic field is generated and the push ring assembly pushes the clutch driving gear to engage with the clutch passive gear. After the electromagnetic coil is de-energized, the clutch driving gear is separated from the clutch passive gear under the action of the return spring. The electromagnetic tooth clutch structure of the present invention has a simple control strategy and can be used in demanding occasions such as passenger car transmissions, and can meet the requirements of high-speed working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile clutches, and more specifically, to an electromagnetic tooth clutch structure. Background Art

[0002] In the prior art, the electromagnetic tooth clutch is to attract the tooth gear pair to transmit power by energizing the electromagnet to generate magnetism. Since there is no structure to isolate the magnetic field around the electromagnet, it is easy to magnetize the parts around the electromagnet. After magnetization, impurities will be adsorbed, thus affecting the action of the clutch, affecting the performance and function of the clutch. In the prior art, the electromagnetic tooth clutch has a low operating speed and is not suitable for high-speed working conditions. Therefore, it is usually only used in situations where the working environment requirements are not high. It is difficult to use in passenger car transmission systems. Summary of the invention

[0003] In order to improve the performance of the electromagnetic tooth clutch and expand its application occasions, the present invention provides an electromagnetic tooth clutch structure that can adapt to high speed and has strict speed change requirements.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] An electromagnetic tooth clutch structure comprises a shaft, a coil assembly, a push ring assembly, a clutch driving gear and a clutch passive gear; characterized in that: the coil assembly comprises a main housing, an electromagnetic coil and an end cover, the push ring assembly comprises a push ring outer ring and a push ring inner ring embedded in the push ring outer ring; the electromagnetic coil is arranged in the main housing and closed by the end cover, the coil assembly, the clutch driving gear and the clutch passive gear are sequentially sleeved on the shaft; an annular accommodating space is formed between the coil assembly and the shaft, the push ring assembly is arranged in the annular accommodating space, the push ring outer ring contacts the inner end of the coil assembly, and the push ring inner ring contacts the outer periphery of the shaft; the push ring inner ring is adjacent to the clutch driving gear, and the clutch driving gear and the clutch passive gear are adjacent.

[0006] Wherein, the electromagnetic coil is provided with a power terminal. When the electromagnetic coil is energized, the electromagnetic coil generates an electromagnetic field and causes the outer ring of the push ring to generate thrust, and pushes the inner ring of the push ring to approach and push the clutch driving gear to engage with the clutch passive gear.

[0007] Wherein, a baffle and a return spring are arranged on the clutch passive tooth, and after the electromagnetic coil is powered off, the clutch driving gear is separated from the clutch passive tooth under the action of the return spring.

[0008] Wherein, the clutch driving gear and the clutch passive gear are both provided with tooth teeth, and the tooth teeth are inverted cone structures.

[0009] Wherein, a limiting ring is arranged on the shaft to limit the axial movement of the inner ring of the push ring.

[0010] Wherein, a gap is formed at the closing position of the main shell and the end cover, so that a communicating air gap is formed between the electromagnetic coil and the outer ring of the push ring.

[0011] The thrust calculation formula is as follows:

[0012]

[0013] Where: F is the thrust, N is the number of turns of the electromagnetic coil, i is the current of the electromagnetic coil, μ is the magnetic permeability of the air, A is the cross-sectional area of ​​the magnetic circuit, and x is the stroke of the outer ring of the push ring.

[0014] Wherein, the outer ring of the push ring is made of magnetic conductive material, and the inner ring of the push ring is made of non-magnetic conductive material.

[0015] Wherein, the outer ring of the push ring is made of S10 steel, and the inner ring of the push ring is made of aluminum alloy.

[0016] Among them, sliding surfaces in contact with the shaft are arranged on the front end and the rear end of the inner ring of the push ring, and an inner recess is arranged between the front end and the rear end of the inner ring of the push ring.

[0017] Compared with the closest prior art, the electromagnetic tooth clutch structure of the present invention has the following beneficial effects:

[0018] The electromagnetic tooth clutch structure of the present invention not only has a simple control strategy, but can also be used for clutch structures in demanding occasions such as passenger car transmissions, and can meet high speed (6000 rpm) operating requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional structure diagram of the electromagnetic tooth clutch structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the disassembled structure of the electromagnetic tooth clutch of the present invention.

[0021] Figure 3 It is a schematic diagram of the principle of the electromagnetic tooth clutch disconnection and engagement transition of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the electromagnetic tooth clutch in the disconnected state.

[0023] Figure 5 Schematic diagram of the electromagnetic tooth clutch structure in the initial state of power-on.

[0024] Figure 6 Schematic diagram of the structure of an electromagnetic tooth clutch in meshing state.

[0025] Figure 7 It is a schematic diagram of the structure of the electromagnetic tooth clutch in the self-locking state.

[0026] Figure 8 Schematic diagram of the electromagnetic tooth clutch structure in low current holding state. DETAILED DESCRIPTION

[0027] The electromagnetic tooth clutch structure of the present invention will be further described below in conjunction with specific embodiments, in order to provide a more complete and clear description of the technical solution of the present invention.

[0028] Example 1

[0029] like Figures 1-2 As shown, the electromagnetic tooth clutch structure of this embodiment includes a shaft 50, a coil assembly, a push ring assembly, a clutch driving gear 31 and a clutch passive gear 32. The coil assembly includes a main housing 11, an electromagnetic coil 10 and an end cover 12. The push ring assembly includes a push ring outer ring 21 and a push ring inner ring 22 embedded in the push ring outer ring 21. The electromagnetic coil 10 is arranged in the main housing 11 and is closed by the end cover 12. The coil assembly, the clutch driving gear 31 and the clutch passive gear 32 are sequentially sleeved on the shaft 50. An annular accommodation space is formed between the coil assembly and the shaft 50. The push ring assembly is arranged in the annular accommodation space, and the push ring assembly contacts the inner end of the coil assembly and can move axially relative to the inner end of the coil assembly, and the stroke is X. The push ring assembly is supported by the shaft 50; the push ring outer ring 21 is adjacent to the clutch driving gear 31, and the clutch driving gear 31 and the clutch passive gear 32 are adjacent. Sliding surfaces in contact with the shaft 50 are provided on the front and rear ends of the inner hole of the push ring inner ring 22, and an inner recess is provided between the front and rear ends of the push ring inner ring for containing lubricating oil to lubricate the contact surface. A gap is formed at the closed position of the main housing 11 and the end cover 12, so that a connected air gap is formed between the electromagnetic coil 10 and the push ring outer ring 21. Tooth teeth are provided on both the clutch driving gear 31 and the clutch passive gear 32, and the tooth teeth are inverted cone structures. A limit ring 52 is provided on the shaft 50 to limit the axial movement of the push ring inner ring. The push ring outer ring is made of magnetic conductive material, while the push ring inner ring is made of non-magnetic conductive material. As an example, the push ring outer ring is made of S10 steel, and the push ring inner ring is made of aluminum alloy.

[0030] The electromagnetic coil is provided with a power terminal. When the electromagnetic coil is powered on, the electromagnetic coil generates an electromagnetic field and causes the outer ring of the push ring to generate thrust, and pushes the inner ring of the push ring to push the clutch driving gear to engage with the clutch passive gear. The clutch passive gear is provided with a baffle and a return spring. When the electromagnetic coil is powered off, the clutch driving gear is separated from the clutch passive gear under the action of the return spring.

[0031] Figure 3 The principle of the transition between the disconnected state and the engaged state of the electromagnetic tooth clutch of this embodiment is given. When the electromagnetic coil is powered off, the push ring outer ring 21 and the push ring inner ring 22 located on the inner side of the electromagnetic coil are in the initial state, and the clutch active gear 31 and the clutch passive gear are in a separated state. When the electromagnetic coil is energized, a thrust is generated under the action of the electromagnetic field generated by the electromagnetic coil and pushes the push ring outer ring to move. Its stroke X is shown in the figure. Under the push of the push ring outer ring, the push ring inner ring moves forward and pushes the clutch active gear to move in the direction close to the clutch passive gear and the two are in a engaged state. Based on the principle of electromagnetic induction, the thrust calculation formula is as follows:

[0032]

[0033] Among them: F is the thrust, N is the number of turns of the electromagnetic coil, i is the current of the electromagnetic coil, μ is the magnetic permeability of air, A is the cross-sectional area of ​​the magnetic circuit, and x is the stroke of the outer ring of the push ring. Based on this formula and the required thrust, the form of the coil and the required number of turns of the coil can be designed.

[0034] The action process of the electromagnetic tooth clutch structure of this embodiment is as follows: Figures 4 to 8 As shown. Figure 4 As shown in the figure, when the electromagnetic coil is not energized, the clutch is in the disconnected state. Figure 5 As shown in the figure, the electromagnetic coil is energized and a magnetic flux is generated, wherein the magnetic lines of force form a closed loop in the magnetic path material along the path of minimum magnetic resistance. Figure 6 As shown in the figure, the inner ring of the push ring pushes the clutch driving gear to make it mesh with the clutch driven gear. Figure 7 As shown in the circled part, the tooth structure is an inverted cone, which can generate a self-locking force to prevent disengagement when subjected to rotational torque. Figure 8 As shown in the figure, when the engagement process is completed and remains stable, the current is reduced to reduce the heat generated by the coil and the energy loss. At this time, the smaller electromagnetic force and self-locking force can still ensure the normal engagement of the clutch teeth. When the coil is powered off, the clutch teeth are disengaged under the action of the return spring force, and its state is the same as Figure 4 same.

[0035] The electromagnetic tooth clutch of this embodiment is exquisitely designed and compact in structure, so that the rotation radius of the rotating parts is small and can be used in high-speed working conditions (6000rpm); and the control strategy is simple. According to the on-off requirements of the clutch, the coil is energized and de-energized, and the current density can be adjusted to achieve a variety of working states. The electromagnetic tooth clutch of this embodiment can be used in passenger car transmissions and other demanding occasions (short engagement / disengagement time, high speed, and large torque capacity). The electromagnetic tooth clutch of this embodiment has been applied to the power coupling device of a plug-in hybrid vehicle model. It is not only highly reliable, but also has precise engagement and disengagement actions.

[0036] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concepts and technical solutions of the present invention, or the concepts and technical solutions of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An electromagnetic tooth clutch structure, comprising a shaft (50), a coil assembly, a push ring assembly, a clutch driving gear (31) and a clutch passive gear (32); characterized in that: The coil assembly comprises a main housing (11), an electromagnetic coil (10) and an end cover (12); the push ring assembly comprises a push ring outer ring (21) and a push ring inner ring (22) embedded in the push ring outer ring (21); the electromagnetic coil (10) is arranged in the main housing (11) and is closed by the end cover (12); the coil assembly, the clutch driving gear (31) and the clutch passive gear (32) are sequentially mounted on the shaft (50); an annular accommodating space is formed between the coil assembly and the shaft (50); the push ring assembly is arranged in the annular accommodating space, and the The outer ring (21) of the push ring is in contact with the inner end of the coil assembly, while the inner ring (22) of the push ring is in contact with the outer periphery of the shaft (50); the inner ring (22) of the push ring is adjacent to the clutch driving gear (31), while the clutch driving gear (31) and the clutch passive gear (32) are adjacent; the outer ring (21) of the push ring is made of a magnetic conductive material, while the inner ring (22) of the push ring is made of a non-magnetic conductive material; sliding surfaces in contact with the shaft (50) are provided at the front and rear ends of the inner ring (22), and an inner ring is provided between the front and rear ends of the inner ring (22). The recess is used to contain lubricating oil to lubricate the contact surface; a gap is formed at the closed position of the main housing (11) and the end cover (12) so that a communicating air gap is formed between the electromagnetic coil (10) and the outer ring of the push ring (21); a power terminal is provided on the electromagnetic coil, and when the electromagnetic coil (10) is energized, the electromagnetic coil (10) generates an electromagnetic field and causes the outer ring of the push ring (21) to generate thrust, and pushes the inner ring of the push ring (22) to approach and push the clutch driving gear (31) to engage with the clutch passive gear (32); a power terminal is provided on the shaft (50). A limit ring (52) is provided for limiting the axial movement of the inner ring (22) of the push ring; tooth teeth are provided on the clutch driving gear (31) and the clutch passive gear (32), and the tooth teeth are of an inverted cone structure, which can generate a self-locking force to prevent disengagement when subjected to a rotational torque. When the engagement process is completed and remains stable, the current is reduced, and at this time, the smaller electromagnetic force and self-locking force can still ensure the normal engagement of the clutch teeth; a baffle and a return spring are provided on the clutch passive gear, and after the electromagnetic coil is powered off, the clutch driving gear is separated from the clutch passive gear under the action of the return spring.

2. The electromagnetic tooth clutch structure according to claim 1, characterized in that: The thrust calculation formula is as follows: Where: F is the thrust, N is the number of turns of the electromagnetic coil, i is the current of the electromagnetic coil, μ is the magnetic permeability of the air, A is the cross-sectional area of ​​the magnetic circuit, and x is the stroke of the outer ring of the push ring.

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