CN111577891A

CN111577891A - Be applicable to DCT gearbox integrated form lightweight aluminum alloy shift fork assembly

Info

Publication number: CN111577891A
Application number: CN202010567557.9A
Authority: CN
Inventors: 杜连征; 王红涛; 伍超军; 刘杨; 管伟
Original assignee: SUZHOU DONGFENG FINEBLANKING ENGINEERING CO LTD
Current assignee: SUZHOU DONGFENG FINEBLANKING ENGINEERING CO LTD
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2020-08-25

Abstract

The invention provides an integrated lightweight aluminum alloy shifting fork assembly suitable for a DCT (discrete cosine transformation) gearbox, which comprises: the shifting fork comprises a shifting fork body, a signal magnet assembly and a neutral gear positioning block; the shift fork body includes: the shifting fork shaft, the first fork leg and the second fork leg which are connected to the shifting fork shaft are arranged, the shifting fork shaft and/or the first fork leg and the second fork leg are/is further provided with a protection structure, the shifting fork shaft is further provided with a boss structure, and the signal magnet assembly and the neutral gear positioning block are arranged on the boss structure. According to the invention, the boss structure is arranged on the shifting fork body, so that the assembly and the fixation of the signal magnet assembly and the neutral gear positioning block are facilitated, and the rotation prevention function is realized while the supporting function is realized. Meanwhile, the shifting fork body is further provided with a protection structure, the protection structure can protect the stressed position on the shifting fork body, and the loss of the shifting fork is reduced so as to prolong the service life of the shifting fork. In addition, the invention also matches with the sampling position to optimally design the structure of the magnet cap, thereby being beneficial to the installation and fixation of the internal magnet.

Description

Be applicable to DCT gearbox integrated form lightweight aluminum alloy shift fork assembly

Technical Field

The invention relates to the technical field of automobile transmission, in particular to an integrated lightweight aluminum alloy shifting fork assembly suitable for a DCT (discrete cosine transformation) gearbox.

Background

The shifting fork is mainly used for gear shifting of a gearbox, is a component on an automobile gearbox, and shifts an intermediate speed-changing wheel under the action of a driving mechanism so as to change the input/output speed ratio. However, the existing shift fork has structural defects, which mainly appear as follows: 1) the assembly of the opponent part of the shifting fork body is inconvenient: 2) the shifting fork body has loss along with use; 3) and the magnet inside the magnetic component is inconvenient to install and fix. Therefore, it is necessary to provide a further solution to the above problems.

Disclosure of Invention

The invention aims to provide an integrated lightweight aluminum alloy shifting fork assembly suitable for a DCT (discrete cosine transformation) gearbox, which overcomes the defects in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

an integrated lightweight aluminum alloy fork assembly suitable for a DCT gearbox, comprising: the shifting fork comprises a shifting fork body, a signal magnet assembly and a neutral gear positioning block;

the shift fork body includes: the shifting fork shaft is connected with a first fork foot and a second fork foot on the shifting fork shaft, a protective structure is further arranged on the shifting fork shaft and/or the first fork foot and the second fork foot, a boss structure is further arranged on the shifting fork shaft, and the signal magnet assembly and the neutral position positioning block are arranged on the boss structure;

the signal magnet assembly includes: the magnetic head comprises a magnet cap, a first magnet and a second magnet which are combined in the magnet cap in a plastic-coated mode, wherein the top surface of the magnet cap is provided with a first sampling position, a second sampling position and a third sampling position which are sequentially arranged, the second sampling position is arranged in a concave mode, the first magnet is arranged opposite to the first sampling position, the second magnet is arranged opposite to the third sampling position, and the polarities of the first magnet and the second magnet facing the corresponding sampling positions are opposite;

the neutral gear positioning block is provided with a positioning surface, the positioning surface is positioned on one side of the shifting fork shaft, a positioning groove is arranged in the middle of the positioning surface, and the surfaces on two sides of the positioning groove face to the shifting fork shaft in an inclined mode.

As an improvement of the shifting fork assembly, the protective structure is a bushing sleeved on the shifting fork shaft and/or the first fork foot and the second fork foot in a plastic-coated mode.

As an improvement of the shifting fork assembly, anti-falling grooves are further formed in the shifting fork shaft and/or the first fork leg and the second fork leg, and the bushings are embedded into the anti-falling grooves.

As an improvement of the shifting fork assembly, the boss structure comprises a first boss and a second boss, and a screw hole suitable for assembling the signal magnet assembly or the neutral gear positioning block is formed in any boss.

As an improvement of the shifting fork assembly, the signal magnet assembly or the neutral gear positioning block is assembled on the corresponding boss through a self-extruding screw.

As an improvement of the shifting fork assembly, at least one surface of the part, close to the shifting fork shaft, of the first fork leg and the second fork leg is provided with a groove, and the bottom of the groove is provided with a through hole.

As an improvement of the shifting fork assembly, the first sampling position and the second sampling position of the top surface of the magnet cap are respectively provided with a first hollow groove for exposing the corresponding magnet.

As an improvement of the shifting fork assembly, at least one side surface of the magnet cap is also provided with a second hollowed-out groove.

As an improvement of the shift fork assembly of the present invention, the signal magnet assembly is disposed on the boss structure through a connecting member, the connecting member including: the magnetic conduction plate and the connecting arm for connecting the magnetic conduction plate to the boss structure.

As an improvement of the shifting fork assembly, the inner side wall of the magnet cap is also provided with a buckle matched with the magnetic conducting plate and a guide limiting lug suitable for the magnetic conducting plate to be clamped.

Compared with the prior art, the invention has the beneficial effects that: according to the integrated lightweight aluminum alloy shifting fork assembly suitable for the DCT, the boss structure is arranged on the shifting fork body, so that the assembly and the fixation of the signal magnet assembly and the neutral gear positioning block are facilitated, and the rotating prevention effect is achieved while the supporting effect is achieved. Meanwhile, the shifting fork body is further provided with a protection structure, the protection structure can protect the stressed position on the shifting fork body, and the loss of the shifting fork is reduced so as to prolong the service life of the shifting fork. In addition, the invention also matches with the sampling position to optimally design the structure of the magnet cap, thereby being beneficial to the installation and fixation of the internal magnet.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of an embodiment of an integrated lightweight aluminum alloy fork assembly for a DCT transmission according to the present invention;

FIG. 2 is a perspective view of the fork body of FIG. 1;

FIG. 3 is an enlarged perspective view of the connector and the first and second magnets of FIG. 1;

FIG. 4 is an enlarged perspective view of the magnet cap of FIG. 1 at an angle;

FIG. 5 is an enlarged perspective view of the magnet cap of FIG. 1 at another angle;

fig. 6 is an enlarged perspective view of the hollow stop positioning block in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6, an embodiment of the present invention provides an integrated light-weight aluminum alloy fork assembly for a DCT transmission, including: shift fork body 1, signal magnet subassembly 2 and neutral gear locating piece 3.

The shift fork body 1 forms the major structure who is applicable to DCT gearbox integrated form lightweight aluminum alloy shift fork assembly, and it includes: a shifting fork shaft 11, a first fork leg 12 and a second fork leg 13 connected to the shifting fork shaft 11. The first fork leg 12 and the second fork leg 13 are integrally formed with the fork shaft 11 or welded thereto.

In order to solve the problem that the shift fork body 1 is worn along with use, a protective structure 14 is further arranged on the shift fork shaft 11 and/or the first fork leg 12 and the second fork leg 13. In this embodiment, the above-mentioned protective structure 14 is arranged at a wear position on the fork shaft 11 and/or the first and

second fork legs

12, 13. In one embodiment, the protective structure 14 is a bushing that is sleeved on the fork shaft 11 and/or the first and

second fork legs

12 and 13 by plastic-covering.

For the shifting fork shaft 11, the bushings are sleeved at two ends of the shifting fork shaft 11 in a plastic-coated mode. Accordingly, the two ends of the fork shaft 11 are provided with anti-slip grooves 110 to play a role of anti-slip when the bushing is coated with plastic. For example, the separation preventing groove 110 may be a rectangular groove formed on the peripheral side surface of the end portion. At this time, the bushes, which are overmolded on both ends of the fork shaft 11, can be inserted into the slip-off preventing grooves 110 on both ends of the fork shaft 11.

For the first and

second prongs

12, 13, the bushing is overmolded at the end positions of the first and

second prongs

12, 13 and at the wear position of the connection between the first and

second prongs

12, 13. Correspondingly, the ends of the first and

second prongs

12, 13 and the wear point of the connection between them have anti-slip grooves 111 to prevent the bush from slipping off when it is being overmolded. Wherein the anti-slip grooves 111 of the ends of the first and

second fork legs

12 and 13 are formed on at least one surface of the ends, for example, the anti-slip grooves 111 are formed on the front, rear and left sides of the ends; the anti-slip groove 111 of the connecting portion between the first and

second fork legs

12, 13 is a through groove arranged in the axial direction.

In addition, at least one surface of the parts of the first fork leg 12 and the second fork leg 13 close to the shifting fork shaft 11 is provided with a groove, and the bottom of the groove is provided with a through hole. In one embodiment, the first and

second fork legs

12 and 13 are symmetrically formed with grooves 15 at both ends of the portion close to the fork shaft 11, and the grooves 15 are arranged to reduce the occurrence of die-casting defects and enhance the die-casting strength, and at the same time, to reduce the weight. Open establish through-hole 151 in recess 15, aim at is being applicable to DCT gearbox integrated form lightweight aluminum alloy shift fork assembly cleaning process, plays unobstructed rivers's effect, prevents to pile up impurity in recess 15, causes to be applicable to the unqualified problem of DCT gearbox integrated form lightweight aluminum alloy shift fork assembly cleanliness.

In order to facilitate the assembly of the signal magnet assembly 2 and the neutral position locating block 3, a boss structure 112 is provided on the fork shaft 11, and the signal magnet assembly 2 and the neutral position locating block 3 are provided on the boss structure 112. Thus, the boss structure 112 can support the counterpart member matching with it, preventing it from rotating due to stress during working, and playing a role of supporting and preventing rotation. In one embodiment, the boss structure 112 includes a first boss 1121 and a second boss 1122, and either boss is provided with a screw hole suitable for assembling the signal magnet assembly 2 or the neutral positioning block 3. The first boss 1121 and the second boss 1122 have a reasonable distance therebetween to prevent the signal magnet assembly 2 and the neutral positioning block 3 from interfering with each other.

Accordingly, the signal magnet assembly 2 or the neutral positioning block 3 is mounted on the

corresponding bosses

1121, 1122 by the self-extruding screws 4. The use of the self-extruding screw 4 has the following advantages: can avoid making the screw thread alone and beat the thread glue, improve the assembly efficiency of signal magnet subassembly 2 or neutral gear locating piece 3. In addition, the use of the self-extruding screw 4 has the advantage of facilitating self-positioning during assembly and providing greater torque.

Further, the signal magnet assembly 2 is disposed on the first boss 1121 through a connecting member 5, wherein the connecting member 5 includes: a magnetic conductive plate 51 and a connecting arm 52 connecting the magnetic conductive plate 51 to the boss structure 112.

To facilitate identification of the direction of assembly, one corner of the plate 51 is punched out to provide a tamper-proof design. The connecting arm 52 has one end connected to the bottom of the magnetic conductive plate 51 and the other end attached to the first boss 1121 by the self-extruding screw 4. Correspondingly, the screw hole 11211 is formed in the top surface of the first boss 1121, and a limiting protrusion 11212 matched with the other end of the connecting arm 52 is formed on one side of the screw hole 11211, so that the connecting arm 52 can be assembled in place.

The neutral positioning block 3 has a connecting portion 31 and a positioning surface 32 formed at one end of the connecting portion 31. The connecting portion 31 is attached to the second boss 1122 by a self-extruding screw 4. Correspondingly, the table top of the second boss 1122 is provided with the screw hole 11221, and one side of the screw hole 11221 is provided with a limit protrusion 11222 matched with the connecting portion 31 of the neutral position positioning block 3, so that the neutral position positioning block 3 can be assembled in place.

The second boss 1122 has a larger mesa size than the first mesa size in view of the need for neutral positioning block 3 to be affected by external forces during neutral positioning. The arrangement direction of the second table top is kept to be the same as the length direction of the neutral gear positioning block 3, and the limit bulge of the neutral gear positioning block 3 is abutted against one end of the connecting part 31.

Signal magnet subassembly 2 is arranged in being applicable to DCT gearbox integrated form lightweight aluminum alloy shift fork assembly working process, and the magnetic field removes at shift fork axial direction, and signal magnet subassembly 2 is through gathering the change in magnetic field, and the signal value according to the output determines which signal point is in at present, and then the gear that discernment gearbox is located.

The signal magnet assembly 2 includes: magnet cap 21 and combine first magnet 22 and second magnet 23 in magnet cap 21 through the mode of moulding by contract, and this embodiment cooperation sampling position carries out optimal design to the structure of magnet cap 21, is favorable to the installation of inside magnet to be fixed.

Specifically, the top surface of the magnet cap 21 has a first sampling position 211, a second sampling position 212, and a third sampling position 213, which represent the shift position X, the neutral position, and the shift position XX, respectively, arranged in this order. In order to structurally distinguish different sampling locations, the second sampling location 212 is arranged recessed, with the first sampling location 211 and the third sampling location 213 distributed on both sides of the recess.

The first magnet 22 is disposed opposite the first sampling site 211, the second magnet 23 is disposed opposite the third sampling site 213, and the polarities of the first and

second magnets

22, 23 facing the corresponding sampling sites are opposite. In order to facilitate the assembly of the first and

second magnets

22 and 23 in a desired direction, one corner of any one magnet is designed to be a bevel edge, which is different from the other three corners, so that a mistake-proofing design is formed, and the correct installation in the assembly process is realized.

In addition, many places set up groove structure on the magnet cap 21 to reduce the use of package plastic material, realize lightweight design and can reduce material cost simultaneously, simultaneously through the groove design, reduce the structure deformation of magnet cap 21 that the package plastic process arouses because the shrink of material, make product structure size more stable.

In one embodiment, the first sampling position 211 and the second sampling position 212 on the top surface of the magnet cap 21 are respectively provided with a first hollow groove 214 exposing the corresponding magnet. A second hollowed-out groove 215 is further provided on at least one side surface of the magnet cap 21.

The benefit of so setting up is that first fretwork recess 214 makes to leak a magnet partly, and the purpose is the process of moulding plastics, carries out space orientation when putting into injection mold with magnet, ensures that magnet is in the spatial position of designing requirement in magnet cap 21. In this embodiment, the shape of the first hollow groove 214 is not limited to a square shape, and a circle or other shapes can achieve this function. Meanwhile, the first hollow groove 214 only leaks out of the plane of the magnet, and the edge of the magnet is wrapped in plastic, so that the magnet can be prevented from being damaged in the production process.

As described above, the signal magnet assembly 2 is disposed on the boss structure 112 through a connecting member 5, and in order to facilitate the assembly of the signal magnet assembly 2 and the magnetic conductive plate 51 of the connecting member 5, a buckle 216 adapted to the magnetic conductive plate 51 and a guiding and limiting bump 217 adapted to the magnetic conductive plate 51 are further disposed on the inner side wall of the magnet cap 21.

Wherein, buckle 216 sets up in the position that the magnet cap 21 inside wall is close to two long limits, and the buckle 216 holding surface of arbitrary side is the plane, uses with the cooperation of magnetic conduction board 51. The reverse side is an inclined plane with an arc angle, and is an installation guide structure, so that the signal magnet assembly 2 can be conveniently assembled on the magnetic conduction plate 51. In addition, considering that the magnet is easy to generate attraction with the magnetic conducting plate 51 and is separated from the magnet cap 21, four corners 218 of the inner cavity of the magnet cap 21 are wrapped by plastic-coated materials, and the plastic-coated plane is not allowed to be higher than the plane of the magnet, so that the anti-dropping function is realized, and the attachment of the magnetic conducting plate 51 and the magnet is not interfered.

The guiding limit projection 217 is arranged on the inner side wall of the magnet cap 21 near the two short sides, and the guiding limit projection 217 on any side has a plane suitable for an inclined plane and transitional connection with the inclined plane. In this way, when the magnetic conductive plate 51 is inserted into the magnet cap 21, the inclined surface provides guidance to smoothly slide the magnetic conductive plate 51 into the designed position. Then, the plane in transitional connection with the inclined plane is matched with the end face of the magnetic conduction plate 51, so that the assembled magnetic conduction plate is stable and does not shake, and further has a limiting effect.

In addition, the long side and the short side of the bottom of the inner cavity of the magnet cap 21 are designed with straight sides, and the straight sides can be used as the reference sides of the external dimension of the magnet cap 21 to ensure the product dimension.

The neutral position positioning block 3 is used as a member for neutral position positioning.

As described above, the neutral positioning block 3 has the connecting portion 31 and the positioning surface 32 formed at one end of the connecting portion 31. At this time, the positioning surface 32 of the neutral positioning block 3 is located on one side of the fork shaft 11, and a positioning groove is formed in the middle of the positioning surface 32, and the surfaces on both sides of the positioning groove are inclined toward the fork shaft 11. When the shifting fork is positioned in a neutral position, the steel balls matched with the shifting fork can be positioned in the positioning groove in the neutral position. In order to meet different assembly requirements, the connecting portion 31 of the neutral positioning block 3 is provided with two mounting through holes 311, and the two mounting through holes 311 are arranged side by side along the length direction of the neutral positioning block 3. Thus, the self-extruding screw 4 can attach the neutral positioning block 3 to the second boss 1122 through the corresponding mounting through hole 311 as required.

In conclusion, the integrated lightweight aluminum alloy shifting fork assembly suitable for the DCT gearbox is convenient for assembling and fixing the signal magnet assembly and the neutral gear positioning block by arranging the boss structure on the shifting fork body, and plays a supporting role and an anti-rotation role. Meanwhile, the shifting fork body is further provided with a protection structure, the protection structure can protect the stressed position on the shifting fork body, and the loss of the shifting fork is reduced so as to prolong the service life of the shifting fork. In addition, the invention also matches with the sampling position to optimally design the structure of the magnet cap, thereby being beneficial to the installation and fixation of the internal magnet.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a be applicable to DCT gearbox integrated form lightweight aluminum alloy shift fork assembly which characterized in that, be applicable to DCT gearbox integrated form lightweight aluminum alloy shift fork assembly includes: the shifting fork comprises a shifting fork body, a signal magnet assembly and a neutral gear positioning block;

2. The integrated lightweight aluminum alloy fork assembly suitable for the DCT transmission case of claim 1, wherein the protection structure is a bushing sleeved on the fork shaft and/or the first fork leg and the second fork leg in a plastic-coated mode.

3. The integrated lightweight aluminum alloy fork assembly suitable for the DCT gearbox as recited in claim 2, wherein the fork shaft and/or the first and second fork legs are further provided with anti-drop grooves, and the bushings are embedded in the anti-drop grooves.

4. The integrated light-weight aluminum alloy shifting fork assembly suitable for the DCT gearbox as recited in claim 1, wherein the boss structure comprises a first boss and a second boss, and a screw hole suitable for assembling the signal magnet assembly or the neutral positioning block is formed in any boss.

5. The integrated lightweight aluminum alloy fork assembly suitable for the DCT transmission of claim 4, wherein the signal magnet assembly or the neutral positioning block is assembled on the corresponding boss through a self-extruding screw.

6. The integrated lightweight aluminum alloy fork assembly suitable for the DCT gearbox as defined in claim 1, wherein at least one surface of the first and second fork legs near the fork shaft is formed with a groove, and the bottom of the groove is formed with a through hole.

7. The integrated lightweight aluminum alloy fork assembly suitable for the DCT gearbox of claim 1, wherein the first sampling position and the second sampling position of the top surface of the magnet cap are respectively provided with a first hollowed-out groove exposing the corresponding magnet.

8. The integrated lightweight aluminum alloy fork assembly suitable for the DCT gearbox as recited in claim 1 or 7, wherein at least one side of the magnet cap is further provided with a second hollowed-out groove.

9. The integrated lightweight aluminum alloy fork assembly suitable for DCT transmissions of claim 1, wherein the signal magnet assembly is disposed on the boss structure by a connector comprising: the magnetic conduction plate and the connecting arm for connecting the magnetic conduction plate to the boss structure.

10. The integrated lightweight aluminum alloy fork assembly suitable for the DCT transmission case as recited in claim 9, wherein a snap fit with the magnetic conductive plate and a guiding and limiting bump suitable for the magnetic conductive plate to snap into are further disposed on an inner side wall of the magnet cap.