Differential self-locking structure

Abstract

The utility model belongs to the technical field of automobile transmission, and particularly relates to a differential mechanism self-locking structure which comprises a differential mechanism assembly, a sliding lock, an elastic reset piece, a push plate and an electromagnetic driver. The differential assembly comprises a shell and a half axle gear, the shell comprises an end face, the end face extends to form a mounting position, and a plurality of guide grooves are formed in the end face; the half axle gear and the sliding lock are arranged in the shell, and the elastic reset piece is arranged between the sliding lock and the half axle gear and used for pushing the sliding lock to be separated from the half axle gear. First clamping teeth are arranged on one side of the half axle gear, and second clamping teeth are arranged at the end of the sliding lock. The other end of the sliding lock is provided with a connecting piece penetrating through the corresponding guide groove, and the connecting piece is connected with the push plate. A rotating gap is formed between the connecting piece and the guide groove, so that the sliding lock can rotate around the axis of the differential mechanism assembly, and the electromagnetic driver is connected with the push plate and arranged at the installation position.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile transmission technology, especially relate to a differential self locking structure. BACKGROUND

[0002] Differential gear mechanisms can be provided in axle assemblies and are used to transmit torque from a drive shaft to a pair of output shafts. The drive shaft can drive the differential by using bevel gears that mesh with ring gears mounted to the housing of the differential. In automotive applications, the differential allows the tires mounted at either end of the axle assembly to rotate at different speeds. This is important when the vehicle turns because the outer tire travels a greater distance on the arc than the inner tire. Therefore, the outer tire must rotate faster than the inner tire to compensate for the greater distance traveled. The differential includes a differential housing and a gear arrangement that allows torque to be transmitted from the drive shaft to the output shafts while allowing the output shafts to rotate at different speeds as needed. The gear arrangement can generally include a pair of side gears that are mounted for rotation with the respective output shafts. A series of cross pins or pinion shafts are fixedly mounted to the differential housing for rotation therewith. A corresponding plurality of pinions are mounted for rotation with the pinion shafts and are in meshing relationship with both side gears.

[0003] Ordinary differential, although can allow left and right wheels to rotate at different speeds, but when one of the wheels idling, the other on the good road wheel also can not get torque, the car lost the power of travel. To avoid this situation, if two wheels are connected together, power at least can be transmitted to the other side of the wheel, so that the car to get the power of travel, thus extricate from the predicament, so the differential needs to be provided with various kinds of differential locking mechanism. For example, the differential lock structure is developed by Eaton Company of the United States earliest, and is applied to off-road vehicles. And after decades of development, the differential can realize automatic, arbitrary switching differential lock clutch state by using electromagnetic technology.

[0004] The utility model discloses an electromagnetic locking differential, including: left casing, right casing, left half axle gear, right half axle gear, first planetary gear, second planetary gear, differential lock, wave spring, cam, electromagnetic generator, mounting frame and push rod, left casing and right casing are connected together through bolt and constitute differential housing, left half axle gear, right half axle gear, first planetary gear and second planetary gear are bevel gears and all are rotatoryly connected in differential housing, left half axle gear is engaged with first planetary gear and second planetary gear, right half axle gear is engaged with first planetary gear and second planetary gear, left half axle gear has the outer hanging tooth at the outer diameter, the differential lock inner wall surface is processed with the hanging inner tooth of the outer hanging tooth, the inner wall surface of differential housing is provided with axial slot, the outer diameter surface of differential lock has the convex with axial slot, and the convex is slidably connected in axial slot, wave spring is set up between the left end surface of differential lock and left casing, and under normal circumstances, differential lock is pushed to the unlocking state, cam is circular ring, and it is installed on the outer diameter of right casing and rotatoryly connected with right casing, mounting frame is installed on the outer diameter of right casing and is fixed on the stop frame on axle case, electromagnetic generator is installed on mounting frame, the left side surface of cam forms V-shaped spiral slot, and the two edges of spiral slot are cam curve, the wall of right casing is provided with axial through -hole, and push rod is worn in axial through -hole, and the left end of push rod is on the right side surface of differential lock, and the right end of push rod is on the V-shaped spiral slot on the left side surface of cam. When needing to lock, start the button in the driver's cabin, 12V direct current is passed into electromagnetic generator, generates magnetic attraction, and cam and electromagnetic generator adhere and attract, because electromagnetic generator is limited by stop frame, can not rotate, at this moment, cam also can not rotate with electromagnetic generator together with differential housing. When differential housing rotates, three push rods rotate together, and the ball head of push rod contacts with cam curve and generates left axial thrust along with spiral cam curve lift, and push rod pushes differential lock axial movement, after overcoming the resistance of wave spring, the hanging inner tooth on the inner wall surface of differential lock 7 is engaged with the outer hanging tooth of left half axle gear, at this moment, differential lock connects left half axle gear and differential housing together, and differential lock is locked.

[0005] The differential of the above patent document is because the convex is clamped into the axial slot of the differential housing, so the differential lock is an integral structure with the housing, and is relatively fixed. In the actual self-locking process, because the inner teeth on the differential lock and the outer teeth on the half axle gear will be misaligned, when the push rod pushes the differential lock to move, the inner teeth and the outer teeth cannot be engaged, and the differential needs to rotate again to make the inner teeth and the outer teeth misaligned, so that the inner teeth and the outer teeth are engaged. Because the half axle gear rotates, the differential lock also rotates, and under the action of the differential housing driving the differential lock to rotate, the tooth surfaces of the inner teeth and the outer teeth will be pressed and rubbed with each other, which will cause the differential lock and the half axle gear to engage smoothly. The utility model discloses a kind of differential self-locking structures, and the utility model discloses a kind of differential self-locking structures, which are used to solve the problem of differential lock and half shaft gear engagement of prior art.

[0006] The utility model discloses a kind of differential self-locking structures, and the utility model discloses a kind of differential self-locking structures, which are used to solve the problem of differential lock and half shaft gear engagement of prior art.

[0007] To achieve the above object, the utility model embodiment provides a kind of differential self-locking structures, including differential assembly, slide lock, elastic reset piece, push plate and electromagnetic driver;The differential assembly includes shell and half shaft gear, the shell includes one end surface, the end surface extends with installation site, the end surface is equipped with multiple guide grooves;The half shaft gear and the slide lock are located in the shell, the elastic reset piece is located between the slide lock and the half shaft gear, for pushing the slide lock and the half shaft gear apart;The side of the half shaft gear is equipped with first pawl, and the end of the slide lock is equipped with second pawl;The other end of the slide lock is equipped with connecting piece passing through corresponding guide groove, and the connecting piece connects the push plate;Rotating gap is equipped between the connecting piece and the guide groove, so that the slide lock can rotate around the axis of the differential assembly, and the electromagnetic driver is connected with the push plate and located in the installation site.

[0008] Further, the side of the half shaft gear is uniformly distributed with multiple first pawls, and the end of the slide lock is distributed with multiple second pawls;The rotating gap is equal to the tooth width of the second pawl.

[0009] Further, the inner end surface of the shell is equipped with support ring, and the slide lock is rotatably sleeved on the support ring.

[0010] Further, the end of the slide lock is also equipped with multiple bosses, and the bosses abut against the inner end surface of the shell.

[0011] Further, the side of the half shaft gear is also equipped with annular protrusion, and the first pawl is arranged on the annular protrusion;A gasket is sleeved on the annular protrusion, and one end of the elastic reset piece abuts against the gasket.

[0012] Further, the outer ring of the slide lock is also equipped with multiple clamping grooves, the outer ring of the gasket is bent to form a limiting piece, the limiting piece is clamped into the clamping groove, and the effective matching length of the limiting piece and the clamping groove is greater than the reset stroke of the elastic reset piece.

[0013] Further, one end of the slide lock equipped with the second pawl is also equipped with an annular groove, and one end of the elastic reset piece is limited in the annular groove.

[0014] Further, the end side of the slide lock is distributed with multiple second pawls, and tooth slots are formed between adjacent second pawls, and semicircular grooves are arranged on both sides of the bottom of the tooth slot.

[0015] The differential self-locking structure provided by the embodiment of the utility model has at least the following technical effects:

[0016] The electromagnetic driver can push the push plate, and the push plate drives the slide lock to move against the elastic force of the elastic reset member, the first clamping tooth and the second clamping tooth are clamped, and the effect of locking the half axle gear is achieved.

[0017] 1. In the clamping process, when the end surface of the second clamping tooth abuts against the end surface of the first clamping tooth without clamping, the half axle gear drives the slide lock to rotate under the action of static friction due to the rotation gap between the connecting piece and the guide groove when the half axle gear rotates relative to the shell. When the connecting piece is blocked by the side plate of the guide groove, the second clamping tooth is dislocated relative to the first clamping tooth under the action of inertia, so that the second clamping tooth can be clamped into the first clamping tooth smoothly.

[0018] 2. The slide lock can move freely in the rotation gap due to the rotation gap between the connecting piece and the guide groove. When the second clamping tooth contacts the first clamping tooth, the second clamping tooth can rotate relative to the first clamping tooth under the action of inertia of the rotation of the slide lock with the shell, so as to facilitate the clamping of the second clamping tooth and the first clamping tooth.

[0019] 3. The slide lock can move freely in the rotation gap due to the rotation gap between the connecting piece and the guide groove. When the second clamping tooth and the first clamping tooth are clamped, the slide lock can rotate freely with the shell, so that the second clamping tooth can rotate freely in the clamping process, and the mutual friction caused by the extrusion of the tooth surfaces can be avoided. Even if the first clamping tooth and the second clamping tooth are slightly dislocated, the second clamping tooth can be guided into the first clamping tooth under the guidance of the tooth surface of the first clamping tooth.

[0020] 4. The electromagnetic driver can smoothly push the slide lock to move due to the rotation gap between the connecting piece and the guide groove. Even if the slide lock has the phenomenon of adsorbing iron powder, the slide lock can still move smoothly. BRIEF DESCRIPTION OF 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 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 The structure diagram of the differential self-locking structure provided by the embodiment of the utility model.

[0023] Figure 2 The sectional view of the differential self-locking structure provided by the embodiment of the utility model.

[0024] Figure 3 The state view of the slide lock of the differential self-locking structure and the half shaft gear is separated.

[0025] Figure 4 The structure view of the connecting piece of the differential self-locking structure and the shell.

[0026] Figure 5 The structure view of the shell of the differential self-locking structure.

[0027] Figure 6 The structure view of the slide lock of the differential self-locking structure. DETAILED DESCRIPTION

[0028] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the embodiments of the present application, and cannot be understood as a limitation of the present application.

[0029] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0030] 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 technical features indicated. 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 present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the embodiments of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the 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 the specific circumstances.

[0032] In an embodiment of the differential self-locking structure of the utility model, please refer to Figures 1 to 6 , the differential self-locking structure, including differential assembly 100, slide lock 200, elastic reset piece 300, push plate 400 and electromagnetic driver 500. Differential assembly 100 includes shell 110 and half shaft gear 120, shell 110 includes one end face 111, end face 111 extends with installation site 112, and end face 111 is equipped with multiple guide grooves 113. Half shaft gear 120 and slide lock 200 are arranged in shell 110, and elastic reset piece 300 is arranged between slide lock 200 and half shaft gear 120, for pushing slide lock 200 and half shaft gear 120 apart. One side of half shaft gear 120 is equipped with first clamping tooth 121, and the end of slide lock 200 is equipped with second clamping tooth 201;The other end of slide lock 20 is equipped with connecting piece 210 passing through the corresponding guide groove, and connecting piece 210 is connected with push plate 400. Rotational clearance is arranged between connecting piece 400 and guide groove 113, so that slide lock 200 can rotate around the axis of differential assembly 100, and electromagnetic driver 500 is arranged in installation site 112 and is connected with push plate 400.

[0033] The differential self-locking structure of the above embodiment, in the process that slide lock 200 and half shaft gear 120 are engaged, when the end face of second clamping tooth 201 and the end face of first clamping tooth 121 abut without mutual engagement, since connecting piece 210 and guide groove 113 have rotational clearance, when half shaft gear 120 rotates relative to shell 110, under the action of static friction, half shaft gear 120 will drive slide lock 200 to rotate together. When connecting piece 210 is blocked by the side plate of guide groove 113, therefore, under the action of inertia, make second clamping tooth 201 and first clamping tooth 121 misaligned, so that second clamping tooth 201 can be relatively smoothly engaged into first clamping tooth 121.

[0034] When the slide lock 200 rotates with the shell 110, the slide lock 200 can freely move within the rotation gap between the connecting member 210 and the guide groove 113. At the moment when the second tooth 201 contacts the first tooth 121, the second tooth 201 can rotate relative to the first tooth 121 under the action of the first tooth 121 and the inertia of the slide lock 200 rotating with the shell 110, so as to facilitate the engagement of the second tooth 201 with the first tooth 121. Since the slide lock 200 can rotate freely relative to the shell 110, the second tooth 201 can freely rotate during the engagement, thereby avoiding the mutual friction caused by the extrusion of the tooth surfaces. Even if there is a slight misalignment between the first tooth 121 and the second tooth 201, the second tooth 201 can be guided into the first tooth 121 under the guidance of the tooth surface of the first tooth 121. In addition, since the connecting member 210 and the guide groove 113 have a rotation gap, the electromagnetic driver 500 can smoothly push the slide lock 200 to move, even if the slide lock 200 has the phenomenon of attracting iron powder.

[0035] Further, referring to Figure 3 and Figure 6 , the half shaft gear 120 is uniformly provided with a plurality of first teeth 121 on one side, and the end of the slide lock 200 is provided with a plurality of second teeth 201; the rotation gap is equal to the tooth width of the second tooth 201. In this embodiment, when the second tooth 201 completely coincides with the tooth top surface of the first tooth 121, the connecting member 210 of the slide lock 200 rotates in the guide groove 113, and the second tooth 201 can also be engaged with the first tooth 121.

[0036] Further, referring to Figure 2 , the inner end surface of the shell 110 is provided with a support ring 114, and the slide lock 200 is rotatably sleeved on the support ring 114. This embodiment uses the support ring 114 to position and guide the slide lock 200, avoids the axial and radial movement of the slide lock 200, increases the stability of the slide lock 200, and prevents the problem of mutual impact between the slide lock 200 and the shell 110.

[0037] Further, referring to Figure 2 and Figure 3 , the end of the slide lock 200 is further provided with a plurality of bosses 202, and the bosses 202 abut against the inner end surface of the shell 110. Then the slide lock 200 is in contact with the inner end surface of the shell 110 through the bosses 202, so as to reduce the contact area between the slide lock 200 and the shell 110, thereby reducing the friction and making the rotation of the slide lock 200 relative to the shell 110 more smooth.

[0038] Further, referring to Figure 2, one side of the half axle gear 120 is further provided with an annular protrusion 122, and the first clamping tooth 121 is arranged on the annular protrusion 122. The annular protrusion 122 is sleeved with a gasket 130, and one end of the elastic return member 300 is in abutment with the gasket 130. In the embodiment, the gasket 130 is in contact with the elastic return member 300, so that the elastic return member 300 is prevented from contacting the half axle gear 120, and the problem of mutual friction between the elastic return member 300 and the half axle gear 120 is avoided.

[0039] Further, referring to Figure 3 , the outer ring of the slide lock 200 is further provided with a plurality of clamping grooves 203, the outer ring of the gasket 130 is bent to form a limiting piece 131, the limiting piece 131 is clamped into the clamping groove 203, and the effective cooperation length of the limiting piece 131 and the clamping groove 203 is greater than the reset stroke of the elastic return member 300. In the embodiment, the limiting piece 131 on the gasket 130 makes the gasket 130 form an integral whole with the slide lock 200, so that the problem of rotation of the elastic return member 300 relative to the gasket 130 is avoided. The elastic return member 300 is prevented from being subjected to radial torsion, and the elastic return member 300 is well protected. The elastic return member 300 can be a compression spring, preferably a wave spring.

[0040] Further, referring to Figure 3 and Figure 6 , the slide lock 200 is provided with an annular groove 204 at one end of the second clamping tooth 203, and one end of the elastic return member 300 is limited in the annular groove 204. The elastic return member 300 is limited and supported.

[0041] Further, referring to Figure 6 , the slide lock 200 is provided with a plurality of second clamping teeth 201 distributed on the end side, tooth grooves 205 are formed between adjacent second clamping teeth 201, and semicircular grooves 206 are arranged on both sides of the bottom of the tooth groove 205. The semicircular grooves 206 can remove the stress problem of the tooth root of the second clamping tooth 201, and avoid tooth root fracture. When the first clamping tooth 121 and the second clamping tooth 201 cooperate, the iron powder and the like adsorbed on the tooth surface can be extruded into the semicircular groove 206, and the problem of interference with the engagement of the first clamping tooth 121 and the second clamping tooth 201 is avoided.

[0042] The above is only a preferred embodiment of the present application, and is not intended 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 self-locking structure, comprising a differential assembly, a slide lock, an elastic reset member, a push plate and an electromagnetic driver; the differential assembly comprises a housing and a half shaft gear, the housing comprises an end face, the end face extends with a mounting position, and the end face is provided with a plurality of guide grooves; the half shaft gear and the slide lock are arranged in the housing, the elastic reset member is arranged between the slide lock and the half shaft gear, and is used for pushing the slide lock and the half shaft gear apart; one side of the half shaft gear is provided with first clamping teeth, and the end of the slide lock is provided with second clamping teeth; characterized in that, The other end of the slide lock is provided with a connecting piece penetrating the guide groove, and the connecting piece connects the push plate; a rotation gap is arranged between the connecting piece and the guide groove, so that the slide lock can rotate around the axis of the differential assembly, and the electromagnetic driver is connected to the push plate and arranged in the mounting position.

2. The differential self-locking structure according to claim 1, characterized in that: The half shaft gear is uniformly provided with a plurality of first clamping teeth on one side, and the end of the slide lock is provided with a plurality of second clamping teeth; the rotation gap is equal to the tooth width of the second clamping teeth.

3. The differential self-locking structure according to claim 1, characterized in that: The inner end surface of the shell is provided with a supporting ring, and the slide lock is rotatably sleeved on the supporting ring.

4. The differential self-locking arrangement according to any one of claims 1 to 3, characterized in that: The end of the slide lock is further provided with a plurality of bosses, and the bosses abut against the inner end surface of the shell.

5. The differential self-locking arrangement according to any one of claims 1 to 3, characterized in that: The half shaft gear is further provided with an annular protrusion on one side, and the first clamping teeth are arranged on the annular protrusion; a gasket is sleeved on the annular protrusion, and one end of the elastic return member abuts against the gasket.

6. The differential self-locking arrangement according to claim 5, characterized in that: The outer ring of the slide lock is further provided with a plurality of clamping grooves, the outer ring of the gasket is bent to form a limiting piece, the limiting piece is clamped into the clamping groove, and the effective matching length of the limiting piece and the clamping groove is greater than the return stroke of the elastic return member.

7. The differential self-locking arrangement according to claim 5, characterized in that: The end of the slide lock provided with the second clamping teeth is further provided with an annular groove, and one end of the elastic return member is limited in the annular groove.

8. The differential self-locking arrangement according to claim 1, characterized in that: The end side of the slide lock is distributed with a plurality of second clamping teeth, and a tooth groove is formed between adjacent second clamping teeth, and semicircular grooves are arranged on both sides of the bottom of the tooth groove.

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