Electromagnetic driver structure of differential mechanism

Abstract

The utility model belongs to the technical field of automobile transmission, and particularly relates to a differential electromagnetic driver structure which comprises a shell, an electromagnetic coil, a mounting cover, a supporting sleeve and a sliding sleeve. The shell comprises an outer ring and an inner ring, the inner ring, the outer ring and the bottom of the shell form an annular cavity, and the electromagnetic coil is arranged in the annular cavity; a mounting hole is formed in one side of the inner ring, the supporting sleeve is arranged on the inner side of the shell, a mounting cavity is formed between the supporting sleeve and the inner side of the inner ring, one end of the supporting sleeve extends outwards in the radial direction to form a plurality of supporting pieces, and the supporting pieces are supported in the mounting hole, so that the supporting sleeve supports the shell; the sliding sleeve slidably sleeves the supporting sleeve and comprises a flux sleeve, and the electromagnetic coil is electrified to form an electromagnetic field, so that the sliding sleeve slides along the supporting sleeve; the mounting cover covers the interiors of the annular cavity and the mounting cavity, and a reinforcing ring extending into the mounting cavity is arranged on the inner side of the mounting cover; the supporting sleeve is made of a non-magnetic-conductive material, and the magnetic conductive sleeve and the mounting cover are made of non-magnetic but magnetic-conductive materials.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile transmission technology, especially relates to a differential electromagnetic driver structure. BACKGROUND

[0002] The differential is the device with power transmission and power distribution function inside the automobile, can automatically adjust the inside and outside wheel rotation speed when turning, guarantees the traffic safety, but when encountering the more severe road condition, also often will appear the skidding phenomenon due to the insufficient adhesion. In order to solve the above problems, the existing differential inside usually has the automatic locking mechanism that can play the limited slip effect, the locking mechanism is controlled through certain operating switch and provides certain thrust to realize meshing self-locking or separation unlocking.

[0003] For example, the Chinese utility model patent document with the authorized announcement number CN204878584U discloses an electromagnetic thrust device, including outer ring assembly, electromagnetic assembly and sliding assembly, its characterized in that: the outer ring assembly includes annular outer ring and hollow sliding support sleeve, the outer ring upper end surface recesses have annular recess and the outer ring upper cover is equipped with an upper cover, and the upper cover is annularly closed in the annular recess opening end to form the electromagnetic cavity for accommodating the electromagnetic assembly between the two; the sliding support sleeve is concentrically arranged in the outer ring and a certain space is left between the two, and the sliding assembly is arranged in the space; the electromagnetic assembly is accommodated in the electromagnetic cavity, which includes the magnetic coil arranged around, and the magnetic coil leads out an electric power input line outward and penetrates the outer wall surface of the outer ring; the sliding assembly includes the magnetic sleeve and the wear-resistant sleeve concentrically arranged in the magnetic sleeve, and the two are tightly matched and fixed into an integral whole, so that the sliding assembly can be electromagnetically connected with the electromagnetic assembly and relatively telescopic sliding. The strong magnetic field is formed by the conduction of the magnetic coil, and the sliding assembly is subjected to the magnetic field force in the axial direction upward and is popped up upward and abuts against the differential lock mechanism connected with it, so that the purpose of quick locking is achieved. When the magnetic coil is de-energized, the electromagnetic force basically disappears, the sliding assembly is automatically reset, the differential lock mechanism loses the abutting force, and the separation unlocking is realized.

[0004] For example, the Chinese utility model patent with publication No. CN214305134U discloses a differential with electromagnetic thrust clutch function, which includes a differential housing and a left half axle gear, a right half axle gear, a planetary gear, and a planetary wheel shaft arranged in the differential housing. The differential housing is rotatably supported in the axle reduction box. A transmission gear is fixedly connected to the differential housing and is in meshing transmission with an input gear shaft arranged in the axle reduction box. The differential further comprises an annular planetary gear carrier and an annular end tooth clutch disc arranged in the differential housing. The planetary gear carrier is rotatably supported on the inner circumferential wall of the differential housing. The planetary wheel shaft and the planetary gear are arranged in the planetary gear carrier, and the planetary wheel shaft is fixedly connected to the planetary gear carrier. The end tooth clutch disc is arranged on the right side of the planetary gear carrier and is axially movably supported on the inner circumferential wall of the differential housing. The right end surface of the end tooth clutch disc has a plurality of axially protruding trapezoidal structures arranged in the circumferential direction. The corresponding positions of the right end wall of the differential housing are provided with through holes of the same number. The axially protruding trapezoidal structures pass through the through holes to enable the end tooth clutch disc to rotate synchronously with the differential housing. The right end surface of the planetary gear carrier has a ring of end teeth I. The left end surface of the end tooth clutch disc has a ring of end teeth II matched with the end teeth I. The right side of the end tooth clutch disc is provided with an actuator for pushing the end tooth clutch disc to the left to engage with the planetary gear carrier. A return spring is arranged between the end tooth clutch disc and the differential housing.

[0005] The actuator is an electromagnetic thrust assembly, which includes an electromagnet fixedly connected to the axle reduction box and a piston sleeve axially movable. The piston sleeve is at least indirectly connected to the end tooth clutch disc. The energization of the electromagnet can drive the piston sleeve to axially move to push the end tooth clutch disc to the left to engage with the planetary gear carrier. Specifically, the electromagnet includes an annular housing, an electromagnetic coil arranged in the annular housing, and an annular support sleeve arranged on the radially inner side of the annular housing. A wire is arranged to extend into the axle reduction box and is electrically connected to the electromagnetic coil. The piston sleeve is axially movably arranged between the annular housing and the annular support sleeve. The right end of the differential housing axially extends to form a sleeve portion. The annular housing is sleeved on the sleeve portion through the annular support sleeve. When the electromagnetic coil is energized, a magnetic field force axially directed to the end tooth clutch disc is generated, which causes the piston sleeve to axially move to the left. Then, the end tooth clutch disc is driven by the boosting spring to axially move to the planetary gear carrier against the force of the return spring until the end teeth II of the end tooth clutch disc engage with the end teeth I of the planetary gear carrier. The end tooth clutch disc and the planetary gear carrier are combined. Since the end tooth clutch disc rotates synchronously with the differential housing, the planetary gear carrier is coupled with the differential housing and rotates synchronously. At this time, the torque output by the driving motor is transmitted to the input gear shaft, and then is transmitted to the planetary gear train through the transmission gear, the differential housing, the end tooth clutch disc, and the planetary gear carrier, and then drives the wheel shaft to realize the power transmission from the driving motor to the wheel shaft.

[0006] The technical solutions of the above patent documents all utilize the electromagnetic coil to generate a magnetic force, and the magnetic force is applied to a movable part (a magnetic sliding sleeve or an end tooth clutch disc) to make the movable part form axial movement and move away from the electromagnetic coil. In order to make the movable part move away from the electromagnetic coil, the movable part needs to have magnetic properties to form a magnetic field with the same polarity as the electromagnetic coil. In the case that the movable part (the magnetic sliding sleeve or the end tooth clutch disc) has magnetic properties, the magnetic properties will be transmitted to the differential housing and the gear, so that the gear and the housing adsorb iron powder formed due to meshing wear, which further increases the wear of the gear. In addition, the iron powder formed by the differential will be adsorbed on the moving part, which will cause the movable part to run poorly or even be stuck. Content of the Utility Model

[0007] The utility model aims at providing a differential electromagnetic driver structure, which solves the problems of poor operation and even being stuck of the electromagnetic driver of the differential lock in the prior art.

[0008] To achieve the above-mentioned purpose, the utility model embodiment provides a differential electromagnetic driver structure for meshing a differential sliding lock with a half shaft gear, which comprises a shell, an electromagnetic coil, a mounting cover, a support sleeve and a sliding sleeve. The shell comprises an outer ring and an inner ring, and the inner ring and the outer ring and the bottom of the shell form an annular cavity, and the electromagnetic coil is arranged in the annular cavity. One side of the inner ring is provided with a mounting hole, the support sleeve is arranged on the inner side of the shell, and an installation cavity is formed between the support sleeve and the inner side of the inner ring. The support sleeve extends radially outward at one end and is provided with a plurality of support members, which are supported in the mounting hole to support the shell. The sliding sleeve is slidably sleeved on the support sleeve and comprises a magnetic guide sleeve. The electromagnetic coil is energized to form an electromagnetic field, so that the sliding sleeve slides along the support sleeve. The mounting cover covers the inside of the annular cavity and the installation cavity, and the inner side of the mounting cover is provided with a reinforcing ring extending into the installation cavity. The support sleeve is made of non-magnetic material, and the magnetic guide sleeve and the mounting cover are made of non-magnetic but magnetically conductive material.

[0009] Further, the support members are welded to the inner side wall of the mounting hole.

[0010] Further, the inner ring of the sliding sleeve is provided with an annular groove, and the two sides of the annular groove form a convex ring supported on the outer side of the support sleeve.

[0011] Further, the sliding sleeve further comprises a wear-resistant ring, which is connected to the end of the magnetic guide sleeve; and the end of the wear-resistant ring extends out of the installation cavity.

[0012] Further, the end of the magnetic guide sleeve is provided with a stepped position, the stepped position is provided with an annular clamping groove, the wear-resistant ring extends a clamping ring, and the clamping ring is clamped in the annular clamping groove.

[0013] Further, the inner ring of the reinforcing ring forms a buffer hole, and the outer ring of the magnetic conducting sleeve is provided with a conical surface, and the maximum outer diameter part of the conical surface is not less than the inner diameter of the buffer hole.

[0014] Further, the inner ring of the mounting cover extends to the shaft center to form a blocking ring of the buffer hole, and the magnetic conducting sleeve is provided with an annular clearance near one end close to the buffer hole, for avoiding the blocking ring.

[0015] Further, the sliding sleeve is further provided with a supporting convex ring at one end close to the supporting piece, and the supporting convex ring is used for abutting against the supporting piece.

[0016] Further, the mounting cover and the shell are made of metal iron, and the mounting cover and the shell are clamped to form a magnetic conducting structure, and the supporting sleeve is made of 304 stainless steel.

[0017] Further, the supporting sleeve extends out of the shell at one end away from the supporting piece.

[0018] The above one or more technical solutions in the differential electromagnetism driver structure provided by the embodiment of the utility model have at least the following technical effects:

[0019] 1. When the differential gear needs to be braked to rotate at different speeds, the electromagnetic coil is powered to form an electromagnetic field, and the electromagnetic field acts on the mounting cover and the magnetic conducting sleeve. Since the mounting cover and the magnetic conducting sleeve are non-magnetic but can conduct magnetism, when the electromagnetic field acts on the mounting cover and the magnetic conducting sleeve, the mounting cover and the magnetic conducting sleeve will form magnetism. Since the mounting cover is equivalent to the outer ring of the electromagnetic coil, and the magnetic conducting sleeve is located in the inner ring of the electromagnetic coil, the magnetic conducting sleeve and the mounting cover form attractive magnetism, so that the sliding sleeve formed by the magnetic conducting sleeve moves to the mounting cover, and the actuator in the differential gear and the half shaft gear are engaged. In addition, the reinforcing ring is arranged in the inner ring of the mounting cover, so that the magnetic force of the mounting cover can be increased through the reinforcing ring, and the sliding sleeve can be more smoothly moved to one side of the mounting cover.

[0020] 2. After the electromagnetic coil is powered off, the electromagnetic field is lost, and the mounting cover and the magnetic conducting sleeve return to no magnetism, so that the electromagnetic driver and the differential gear as a whole do not have magnetism, and the phenomenon of adsorbing iron powder is avoided, so that the problem of the electromagnetic driver being stuck and the problem of the gear in the differential gear being abraded are avoided. DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 A structure diagram of the differential electromagnetism driver is provided for the embodiment of the utility model.

[0023] Figure 2 A structure diagram of the other side of the differential electromagnetism driver is provided for the embodiment of the utility model.

[0024] Figure 3 A sectional view of the structure of the differential electromagnetism driver is provided for the embodiment of the utility model.

[0025] Figure 4 A partial enlarged view of Figure 3 DETAILED DESCRIPTION

[0026] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the embodiments of the utility model, and cannot be understood as a limitation of the utility model.

[0027] In the description of the embodiments of the utility model, it is understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0028] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] ​In the embodiments of the utility model, unless there are explicit provisions and limitations, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication of two elements or interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to specific circumstances.

[0030] In an embodiment of the differential electromagnet drive structure of the utility model, please refer to Figures 1 to 4 , differential electromagnet drive structure, for pushing differential slide lock and half shaft gear meshing;Including shell 100, electromagnetic coil 200, installation cover 300, support sleeve 400 and slide sleeve 500.Shell 100 includes outer ring 101 and inner ring 102, and inner ring 102 and outer ring 101 form an annular cavity 103 with the bottom of shell 100, and electromagnetic coil 200 is arranged in the annular cavity 103.One side of inner ring 102 is provided with mounting hole 104, support sleeve 400 is arranged on the inner side of shell 100, and mounting cavity 105 is formed between support sleeve 400 and the inner side of inner ring 102, and a plurality of support members 401 are radially extended outward on one end of support sleeve 400, and support members 401 are supported in mounting hole 104, so that support sleeve 400 supports and fixes shell 100.Slide sleeve 500 is slidably sleeved on support sleeve 400, and slide sleeve 500 includes magnetic sleeve 510, electromagnetic coil 200 forms electromagnetic field when energized, so that slide sleeve slides along the axial direction of support sleeve 400;Installation cover 300 covers the inside of annular cavity 103 and mounting cavity 105, and the inner side of installation cover 300 is provided with reinforcing ring 310 extending into mounting cavity 105.Support sleeve 400 is non-magnetic material, magnetic sleeve 510 and installation cover 300 are non-magnetic but magnetic material.Therefore, support sleeve 400 will not form magnetism under the action of electromagnetic field, while magnetic sleeve 510 and installation cover 300 will form magnetism under the action of electromagnetic field.Preferably, the material of installation cover 300 and shell 100 is metal iron, and installation cover 300 is integrally connected with shell 100 to form a magnetic conduction structure, which is 10 steel, pure iron and the like, and magnetic sleeve 510 can be easy iron, so as to ensure its wear resistance. Support sleeve is 304 stainless steel.

[0031] In the differential electromagnetic drive mechanism of the above embodiment, when it is necessary to brake the differential gear's differential rotation, the electromagnetic coil 200 is energized to generate an electromagnetic field, which acts on the mounting cover 300 and the magnetic sleeve 510. Since the mounting cover 300 and the magnetic sleeve 510 are non-magnetic but magnetically conductive materials, when the electromagnetic field acts on the mounting cover 300 and the magnetic sleeve 510, they will become magnetic. Furthermore, since the mounting cover 300 is located on the outer ring of the electromagnetic coil 200, while the magnetic sleeve 510 is located on the inner ring of the electromagnetic coil 200, the magnetic sleeve 510 and the mounting cover 300 form an attractive magnetic attraction, causing the sliding sleeve 500 formed by the magnetic sleeve 510 to move towards the mounting cover 300, which can then drive the actuator in the differential to mesh with the half-shaft gear. In addition, a reinforcing ring 310 is provided on the inner ring of the mounting cover 300. The reinforcing ring 310 can increase the magnetic force of the mounting cover 300, allowing the sliding sleeve 500 to move more smoothly to one side of the mounting cover 300. After the electromagnetic coil 200 is de-energized, the electromagnetic field is lost, and the mounting cover 300 and the magnetic sleeve 510 return to non-magnetic state. Therefore, the electromagnetic drive and the differential as a whole are not magnetic, which will not cause the phenomenon of attracting iron powder, thus avoiding the problem of the electromagnetic drive jamming and the problem of accelerated wear of the gears in the differential.

[0032] Furthermore, refer to Figure 2 The support member 410 is welded to the inner wall of the mounting hole 104, thereby increasing the stability of the connection between the support sleeve 400 and the outer shell 100.

[0033] Furthermore, refer to Figure 3 and Figure 4 The inner ring of the sliding sleeve 500 is provided with an annular groove 501, and the two sides of the annular groove 501 form convex rings 502 that support the outer side of the support sleeve 400. Therefore, the contact area between the sliding sleeve 500 and the support sleeve 400 can be reduced, friction can be reduced, and the sliding sleeve 500 can slide more smoothly along the support sleeve 400.

[0034] Furthermore, refer to Figure 3 and Figure 4 The sliding sleeve 500 also includes a wear-resistant ring 520, which is snapped onto the end of the magnetic sleeve 510. The end of the wear-resistant ring 520 extends out of the mounting cavity 105. In an embodiment, when the electromagnetic actuator is applied to the differential, it contacts the differential actuator through the end face of the wear-resistant ring 520. The wear-resistant ring 520 has good wear resistance, thus reducing wear on the sliding sleeve 500. Preferably, the wear-resistant ring 520 can be PEK.

[0035] Furthermore, refer to Figure 3 and Figure 4The end of the magnetic conducting sleeve 510 is provided with a step position 511, the step position 511 is provided with an annular clamping groove 512, the wear-resistant ring 520 extends a clamping ring 521, the clamping ring 521 is clamped in the annular clamping groove 512. So that the wear-resistant sleeve 520 and the magnetic conducting sleeve 510 are fixedly connected. In addition, the wear-resistant sleeve 520 can also be injection molded and formed on the step position 511.

[0036] Further, referring to Figure 3 and Figure 4 The inner circle of the reinforcing ring 310 forms a buffer hole 311, the outer circle of the magnetic conducting sleeve 510 is provided with a conical surface 513, the maximum outer diameter part of the conical surface 513 is not less than the inner diameter of the buffer hole 311. In this embodiment, the sliding sleeve 500 can extend into the buffer hole 311, when the magnetic conducting sleeve 510 extends to the depth position of the buffer hole 311, the magnetism of the magnetic conducting sleeve 510 and the reinforcing ring 310 will repel each other, avoiding further movement, thereby playing a buffering role, avoiding the sliding sleeve 500 from impacting the mounting plate 300. Even if the sliding sleeve 500 continues to move, through the cooperation of the conical surface 513 and the reinforcing ring 310, the problem of the sliding sleeve 500 impacting the mounting plate 300 is further avoided.

[0037] Further, referring to Figure 3 and Figure 4 The inner circle of the mounting cover 300 extends towards the axis to form a blocking ring 301 of the buffer hole 311, the end of the magnetic conducting sleeve 510 close to the buffer hole is provided with an annular clearance position 514, which is used to avoid the blocking ring 301. While the blocking ring 301 can limit the end face formed by the annular clearance position 514, thereby avoiding the problem of the sliding sleeve 500 sliding out of the mounting cavity 105.

[0038] Further, referring to Figure 3 The end of the sliding sleeve 500 close to the support piece 410 is also provided with a support convex ring 503, which is used to abut against the support piece 410. When the sliding sleeve 500 slides relative to the support sleeve 400, the friction of the end of the sliding sleeve 500 can be reduced.

[0039] Further, referring to Figure 4 and Figures 2 to 4 Figure 1 Figure 3 The end of the support sleeve 400 away from the support piece 410 extends out of the shell 100, so that the push plate connected to the actuator in the differential can be sleeved on the part of the support sleeve 400 extending out of the shell 100.

[0040] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A differential electromagnetic driver structure for pushing a differential slide lock into engagement with a half shaft gear; characterized by, The application relates to a magnetic guide structure, which comprises a shell, an electromagnetic coil, a mounting cover, a supporting sleeve and a sliding sleeve; the shell comprises an outer ring and an inner ring, an annular cavity is formed between the bottom of the shell and the inner ring and the outer ring, and the electromagnetic coil is arranged in the annular cavity; one side of the inner ring is provided with a mounting hole, the supporting sleeve is arranged on the inner side of the shell, an installation cavity is formed between the inner side of the supporting sleeve and the inner ring, a plurality of supporting pieces are radially extended outward from one end of the supporting sleeve, the supporting pieces are supported in the mounting hole, and the supporting sleeve supports the shell; the sliding sleeve is slidably sleeved on the supporting sleeve, the sliding sleeve comprises a magnetic conducting sleeve, the electromagnetic coil generates an electromagnetic field when electrified, and the sliding sleeve slides along the supporting sleeve; the mounting cover covers the inside of the annular cavity and the installation cavity, the inner side of the mounting cover is provided with a reinforcing ring extending into the installation cavity; the supporting sleeve is made of non-magnetic material, and the magnetic conducting sleeve and the mounting cover are made of non-magnetic but magnetic conducting material.

2. The electromagnetic differential drive structure of claim 1, wherein: The supporting pieces are welded to the inner side wall of the mounting hole.

3. The electromagnetic differential drive structure of claim 1, wherein: An annular groove is arranged on the inner ring of the sliding sleeve, and the two sides of the annular groove form convex rings supported on the outer side of the supporting sleeve.

4. The electromagnetic differential drive structure according to any one of claims 1 to 3, characterized in that: The sliding sleeve further comprises a wear-resistant ring, the wear-resistant ring is connected to the end of the magnetic conducting sleeve, and the end of the wear-resistant ring extends out of the installation cavity.

5. The electromagnetic differential drive structure of claim 4, wherein: The end of the magnetic conducting sleeve is provided with a stepped position, the stepped position is provided with an annular clamping groove, the wear-resistant ring is extended with a clamping ring, and the clamping ring is clamped in the annular clamping groove.

6. The electromagnetic differential drive structure of claim 1, wherein: The inner ring of the reinforcing ring forms a buffer hole, the outer ring of the magnetic conducting sleeve is provided with a conical surface, and the maximum outer diameter of the conical surface is not less than the inner diameter of the buffer hole.

7. The electromagnetic differential drive structure of claim 6, wherein: The inner ring of the mounting cover extends to the shaft center to form a blocking ring of the buffer hole, and the end of the magnetic conducting sleeve close to the buffer hole is provided with an annular clearance position for avoiding the blocking ring.

8. The electromagnetic differential drive structure of claim 1, wherein: The end of the sliding sleeve close to the supporting piece is further provided with a supporting convex ring for abutting against the supporting piece.

9. The electromagnetic differential drive structure of claim 1, wherein: The mounting cover and the shell are made of metal iron, the mounting cover and the shell are clamped to be integrated into a magnetic conducting structure, and the supporting sleeve is made of 304 stainless steel.

10. The electromagnetic differential drive structure of claim 1, wherein: The end of the supporting sleeve away from the supporting piece extends out of the shell.

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