Shifting fork supporting structure of electric drive axle gearbox

Abstract

The utility model discloses an electric drive axle gearbox shifting fork supporting structure which can effectively prevent a shifting fork from falling off in the gear shifting process, improve the gear shifting reliability of a gearbox and prolong the service life of the shifting fork. The gear shifting mechanism comprises a gear shifting gear shaft assembly; the shifting fork mechanism is provided with a convex supporting block structure; a vertically-arranged mounting step hole is formed in the position, corresponding to the right lower portion of the supporting block structure, of the gearbox shell; a hand feeling pin; and a plug screw; shifting fork arms on the two sides of the shifting fork mechanism are installed on a synchronizer corresponding to a gear shifting gear shaft assembly, the shifting fork arm on one side of the shifting fork mechanism is provided with the outwards-protruding supporting block structure, the hand feeling pin is inserted into the installation step hole from bottom to top, and a large ball on the top of the hand feeling pin is tightly attached to the lower surface of the supporting block structure. A screw plug is in threaded connection with a lower screw hole of the installation step hole, and the upper surface of the screw plug is tightly attached to the bottom end face of the hand feeling pin.

Description

Technical Field

[0001] The utility model relates to the technical field of shift forks, in particular to a shift fork supporting structure for an electric drive axle transmission. Background Art

[0002] With the continuous development of electric vehicle technology, the performance requirements for electric drive axle transmissions, as key components, are becoming increasingly demanding. The shift fork plays a crucial role in the shifting process of electric drive axle transmissions. In the prior art, synchronizer shifting is commonly used for transmission shifting. This structure uses a shift fork to move a gear sleeve, which connects the gear hub and the coupling gear through internal and external splines, achieving synchronous rotation of the gear and shaft, thereby achieving shifting. This prior art structure is susceptible to severe torque impacts and the effects of gravity, leading to wear, deformation, or failure of the shift fork, as well as the risk of dislodging. This in turn affects the reliability and service life of the transmission and increases maintenance costs. Utility Model Content

[0003] In response to the above problems, the utility model provides an electric drive axle transmission shift fork support structure, which can effectively prevent the shift fork from falling off during the shifting process, increase the shifting reliability of the transmission, and extend the service life of the shift fork.

[0004] An electric drive axle transmission fork support structure, characterized in that it includes:

[0005] shift gear shaft assembly;

[0006] A shift fork mechanism is provided with an outwardly convex support block structure;

[0007] The gearbox housing is provided with a vertically arranged mounting step hole directly below the support block structure;

[0008] Hand-feel pin;

[0009] and screw plugs;

[0010] The fork arms on both sides of the fork mechanism are installed at the synchronizer of the corresponding shift gear shaft assembly, and one of the fork arms on one side of the fork mechanism is provided with the outwardly protruding support block structure, and the tactile pin is inserted into the mounting step hole from bottom to top, and the top large ball of the tactile pin is in close contact with the lower surface of the support block structure, and the screw plug is threadedly connected to the lower screw hole of the mounting step hole, and the upper surface of the screw plug is in close contact with the bottom end face of the tactile pin.

[0011] It is further characterized by:

[0012] When the shift fork mechanism moves axially, the top area of ​​the large ball on the top of the hand-feeling pin is in close contact with the corresponding position on the bottom surface of the support block structure;

[0013] The bottom surface of the support block structure is flat and in a horizontal arrangement, ensuring that the hand-feeling pin provides reliable support for the entire fork mechanism in the direction of gravity;

[0014] The hand-feel pin includes a column part, a large ball, and a plurality of small balls. The bottom of the column part is provided with a stop boss, the top of the column part is provided with an inner groove, and the plurality of small balls are arranged in the inner groove. The middle and lower parts of the large ball are built into the inner groove, and the outer wall of the middle and lower parts of the large ball is arranged in close contact with the corresponding surface contact points of the plurality of small balls. The top of the large ball is convex above the inner groove, and the top of the large ball is used to support the bottom surface of the support block structure.

[0015] The length direction of the support block structure is the direction of axial movement of the synchronizer. When the synchronizer is in the neutral position, the large ball of the hand-feeling pin is located in the middle area of ​​the length direction of the support block structure. When the synchronizer is in the corresponding gear, the large ball of the hand-feeling pin is located at the corresponding side position of the length direction of the support block structure, ensuring that the hand-feeling pin has a reliable auxiliary support function for the support block structure regardless of the gear position.

[0016] The mounting step hole includes an upper through hole and a lower screw hole. The diameter of the lower screw hole is larger than the diameter of the upper through hole. The height of the column portion is larger than the length of the upper through hole. After the column portion passes through the upper through hole, the top of the large ball is in contact with the bottom surface of the support block structure.

[0017] The length of the bottom of the support block structure is greater than the thickness of the corresponding side fork arm of the fork mechanism, ensuring that it is reliably supported by the hand-feeling pin during the shifting process, while the thickness of the fork arm is not increased and the assembly of the entire fork mechanism is not affected;

[0018] The gearbox housing is provided with a thickened limiting portion just below the supporting block structure of each group of the fork mechanisms. The thickened limiting portion enables the mounting step hole to be reliably arranged, thereby ensuring reliable and stable installation of the fork mechanism.

[0019] After adopting the structure of the utility model, during the gearbox assembly process, after the shift fork mechanism is correctly installed into the gearbox, the gear is engaged in neutral, the speed change direction is placed in a convenient installation state, the hand-feeling column pin is inserted into the installation step hole from bottom to top, and then the screw plug is installed and tightened. When the shift fork mechanism moves axially, the hand-feeling column pin, the screw plug and the gearbox housing remain stationary, the large ball rolls, and at the same time, the large ball contacts the bottom surface of the support block structure, so that point support is formed during the neutral gear shifting process; it can effectively prevent the shift fork from falling off during the gear shifting process, increase the gear shifting reliability of the gearbox, and extend the service life of the shift fork. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic sectional view of the main view of the present invention;

[0021] Figure 2 It is a partially enlarged side view of the utility model (in neutral state);

[0022] Figure 3 It is a partially enlarged side view of the utility model (in the first gear state);

[0023] Figure 4 This is a partially enlarged side view of the utility model (in the second gear state);

[0024] The names corresponding to the serial numbers in the figure are as follows:

[0025] Shift gear shaft assembly 10, synchronizer 11, shift fork mechanism 20, shift fork arm 21, support block structure 22, transmission housing 30, thickened limit portion 301, mounting step hole 31, upper through hole 311, lower screw hole 312, hand-feel pin 40, column portion 41, stop boss 411, inner groove 412, center blind hole 413, large ball 42, small ball 43, screw plug 50. DETAILED DESCRIPTION

[0026] An electric drive axle gearbox fork support structure, specific embodiment, see Figures 1-4 : It includes a shift gear shaft assembly 10, a shift fork mechanism 20, a transmission housing 30, a hand-feeling pin 40, and a screw plug 50;

[0027] The shift gear shaft assembly 10 includes a synchronizer 11;

[0028] The fork mechanism 20 includes a fork arm 21, and the fork arm 21 located at the bottom is further provided with an outwardly protruding support block structure 22;

[0029] The gearbox housing 30 is provided with a thickened limiting portion 301 directly below the support block structure 22 of each set of fork mechanisms 20, and the thickened limiting portion 301 is provided with a vertically arranged mounting step hole 31 directly below the support block structure 22;

[0030] The hand-feel pin 40 includes a cylindrical portion 41, a large ball 42, and a plurality of small balls 43. A stop boss 411 is provided at the bottom of the cylindrical portion 41, and an inner groove 412 is provided at the top of the cylindrical portion 41. The plurality of small balls 43 are arranged in the inner groove 412. The middle and lower portion of the large ball 42 is embedded in the inner groove 412, and the outer wall of the middle and lower portion of the large ball 42 is arranged in close contact with the corresponding surface contact points of the plurality of small balls 43. The top of the large ball 42 protrudes above the inner groove 412.

[0031] The fork arms 21 on both sides of the fork mechanism 20 are installed at the synchronizer 11 of the corresponding shift gear shaft assembly 10, and the column part 41 of the hand-feel pin 40 is inserted into the mounting step hole 31 from bottom to top. The large ball 42 on the top of the hand-feel pin 40 is close to the lower surface of the support block structure 22, and the screw plug 50 is threadedly connected to the lower screw hole 312 of the mounting step hole 31, and the upper surface of the screw plug 30 is close to the bottom end face of the stop boss 411 of the hand-feel pin 40.

[0032] In a specific embodiment, the mounting step hole 31 includes an upper through hole 311 and a lower screw hole 312. The diameter of the lower screw hole 312 is larger than the diameter of the upper through hole 311. The height of the column portion 41 is larger than the length of the upper through hole 311. After the column portion 41 passes through the upper through hole 311, the top of the large ball 42 abuts against the bottom surface of the support block structure 22.

[0033] The bottom length L of the support block structure 22 is greater than the thickness D of the corresponding side fork arm 21 of the fork mechanism 20, ensuring that it is reliably supported by the tactile pin 40 during the shifting process. At the same time, the thickness of the fork arm 21 does not increase and does not affect the assembly of the entire fork mechanism 20.

[0034] During specific implementation, the bottom surface of the support block structure 22 is flat and in a horizontal arrangement, ensuring that the hand-feeling pin 40 provides reliable support for the entire fork mechanism 20 in the direction of gravity.

[0035] In a specific embodiment, when the fork mechanism 20 moves axially, the vertex area of ​​the large ball 42 of the hand-feeling pin 40 is in close contact with the corresponding position of the bottom surface of the support block structure 22;

[0036] The length direction A of the support block structure 22 is the direction of axial movement of the synchronizer 11. When the synchronizer 11 is in the neutral position, the large ball 42 of the hand-feel pin 40 is located in the middle area of ​​the length direction of the support block structure 22; when the synchronizer 11 is in the corresponding first gear, the large ball 42 of the hand-feel pin 40 is located on the left side of the length direction of the support block structure 22; when the synchronizer 11 is in the corresponding second gear, the large ball 42 of the hand-feel pin 40 is located on the right side of the length direction of the support block structure 22, ensuring that no matter which gear position, the hand-feel pin 40 has a reliable auxiliary support function for the support block structure 22.

[0037] In specific implementation, the screw plug 50 is a hexagonal screw plug and a fastener with fine thread and end face seal; the column part 41 is also provided with a center blind hole 413 from bottom to top, and the fork mechanism 20 is made of gear steel (20CrMnTi) material with good strength and wear resistance. At the same time, the fork mechanism is synchronously integrated with a support block structure, and the bottom surface of the support block structure is required to have a roughness of more than 1.6.

[0038] Its working principle is as follows: during the assembly of the gearbox, after the shift fork mechanism is correctly installed into the gearbox, engage neutral gear, place the gear shift in a convenient installation state, insert the hand-feeling pin into the installation step hole from bottom to top, and then install the screw plug and tighten it. When the shift fork mechanism moves axially, the hand-feeling pin, screw plug and gearbox housing remain stationary, the large ball rolls, and at the same time, the large ball makes point contact with the bottom surface of the support block structure, thereby forming point support during the neutral gear shifting process; it can effectively prevent the shift fork from falling off during the gear shifting process, increase the gear shifting reliability of the gearbox, and extend the service life of the shift fork.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An electric drive axle transmission fork support structure, characterized in that: It includes: shift gear shaft assembly; A shift fork mechanism is provided with an outwardly convex support block structure; The gearbox housing is provided with a vertically arranged mounting step hole directly below the support block structure; Hand-feel pin; and screw plugs; The shift fork arms on both sides of the shift fork mechanism are installed at the synchronizer of the corresponding shift gear shaft assembly, and the shift fork arms on one side of the shift fork mechanism are provided with the outward-convex support block structure, and the tactile pin is inserted into the mounting step hole from bottom to top, and the top large ball of the tactile pin is in close contact with the lower surface of the support block structure, and the screw plug is threadedly connected to the lower screw hole of the mounting step hole, and the upper surface of the screw plug is in close contact with the bottom end face of the tactile pin.

2. The electric drive axle transmission fork support structure according to claim 1, characterized in that: When the shift fork mechanism moves axially, the top area of ​​the large ball on the top of the hand-feeling pin is in close contact with the corresponding position of the bottom surface of the support block structure.

3. The electric drive axle transmission fork support structure according to claim 2, characterized in that: The bottom surface of the support block structure is flat and in a horizontal arrangement state.

4. The electric drive axle transmission fork support structure according to claim 1, characterized in that: The tactile pin includes a column part, a large ball, and several small balls. A stop boss is provided at the bottom of the column part, an inner groove is provided at the top of the column part, and several small balls are arranged in the inner groove. The middle and lower parts of the large ball are embedded in the inner groove, and the middle and lower outer walls of the large ball are arranged close to the corresponding surface contact points of the several small balls. The top of the large ball protrudes from the inner groove, and the top of the large ball is used to support the bottom surface of the support block structure.

5. The electric drive axle transmission fork support structure according to claim 4, characterized in that: The length direction of the support block structure is the direction of axial movement of the synchronizer. When the synchronizer is in the neutral position, the large ball of the tactile pin is located in the middle area of ​​the length direction of the support block structure. When the synchronizer is in the corresponding gear position, the large ball of the tactile pin is located at the corresponding side position of the length direction of the support block structure.

6. The electric drive axle transmission fork support structure according to claim 4, characterized in that: The mounting step hole includes an upper through hole and a lower screw hole. The aperture of the lower screw hole is larger than the aperture of the upper through hole. The height of the column part is larger than the length of the upper through hole. After the column part passes through the upper through hole, the top of the large ball is in contact with the bottom surface of the support block structure.

7. The electric drive axle transmission fork support structure according to claim 1, characterized in that: The length of the bottom of the support block structure is greater than the thickness of the corresponding side fork arm of the fork mechanism.

8. The electric drive axle transmission fork support structure according to claim 1, characterized in that: The gearbox housing is provided with a thickened limiting portion directly below the supporting block structure corresponding to each group of the shift fork mechanisms.

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