Anti-rotation fork stop

Abstract

The present invention discloses an anti-rotation type fork mouth, including a fork mouth body, the upper end surface of the fork mouth body is provided with an anti-rotation groove, the anti-rotation groove is used to cooperate with the anti-rotation rib plate on the transmission housing, that is, the anti-rotation rib plate on the transmission housing is inserted into the anti-rotation groove, so that the anti-rotation rib plate clamps the fork mouth body to prevent the fork mouth body from rotating. The side of the fork mouth body is provided with a limiting groove, the limiting groove cooperates with the upper limit block of the transmission housing, the fork mouth body moves along the axis of the fork shaft under the drive of the fork shaft, so that the limiting groove slides along the limiting block, the limiting block can play a role in preventing the fork mouth body from rotating on the one hand, and can also play a good limiting role on the fork mouth body on the other hand, so that the gear selection is more accurate. Through the dual anti-rotation of the anti-rotation groove and the limiting groove, the rotation effect of the fork mouth body can be significantly improved, and the accuracy of gear engagement can be improved at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and more particularly to an anti-rotation gear fork. Background Art

[0002] The transmission is one of the most important assemblies in the field of automotive transmission. When the transmission is in 5 / 6 gear, the external gear shifting force will be used to move the 5 / 6 gear fork through the shift head. Since the 5 / 6 gear fork is fixed to the fork shaft, the fork shaft will also move with it. The fork shaft will eventually transfer the force to the 5 / 6 gear fork to make it move, thereby achieving the effect of switching 5 / 6 gear.

[0003] If the 5 / 6 gear fork does not have an anti-rotation function, it will rotate to other positions, causing the transmission to lose the 5 / 6 gear, or even jam the remaining gear forks, making it impossible to select other gears, which will seriously affect the function of the transmission. Therefore, the anti-rotation function of the 5 / 6 gear fork is one of the essential conditions to ensure the normal gear shifting of the transmission.

[0004] Currently on the market, the 5 / 6 fork anti-rotation design is limited by a right-angle surface, but the right-angle surface limitation is not effective in limiting back and forth rotation.

[0005] Therefore, how to solve the problem that the anti-rotation effect of the existing anti-rotation design of the fork stop is poor is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In view of this, an object of the present invention is to provide an anti-rotation fork stop with good anti-rotation effect.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A rotation-proof fork mouth comprises a fork mouth body, the fork mouth body is provided with a through hole for inserting a shift fork shaft, the side surface of the fork mouth body is provided with a limit groove which passes through the fork mouth body from top to bottom and is used to slide in cooperation with a limit block on a transmission housing, and the upper end surface of the fork mouth body is provided with an anti-rotation groove which passes through the through hole axially and is used to insert in cooperation with an anti-rotation rib plate on the transmission housing.

[0009] Preferably, the limiting groove is perpendicular to the anti-rotation groove.

[0010] Preferably, the limiting groove is a long groove with a rectangular cross section.

[0011] Preferably, the anti-rotation groove is a long groove with a rectangular cross-section.

[0012] Preferably, the fork opening body is provided with a threaded hole penetrating the through hole, and the threaded hole is provided with a bolt for fixing the fork shaft in the through hole.

[0013] Preferably, the head of the bolt is provided with a first through hole for passing an iron wire, and the fork mouth body is provided with a second through hole for passing an iron wire and parallel to the through hole at the lower part of the threaded hole.

[0014] Preferably, the axis of the threaded hole is perpendicular to the axis of the through hole.

[0015] Preferably, the length of the anti-rotation groove is equal to the diameter of the threaded hole.

[0016] Preferably, the front end of the screw rod of the bolt is provided with a frustum which is inserted into and fits with the conical hole on the fork shaft.

[0017] Preferably, the angle between the generatrix of the frustum and the axis of the frustum is 10-20 degrees.

[0018] The anti-rotation fork mouth provided by the present invention includes a fork mouth body, the upper end surface of the fork mouth body is provided with an anti-rotation groove, and the anti-rotation groove is used to cooperate with the anti-rotation rib plate on the transmission housing, that is, the anti-rotation rib plate on the transmission housing is inserted into the anti-rotation groove, so that the anti-rotation rib plate clamps the fork mouth body to prevent the fork mouth body from rotating. In addition, a limiting groove is provided on the side of the fork mouth body, and the limiting groove cooperates with the upper limit block of the transmission housing. The fork mouth body moves along the axis of the fork shaft under the drive of the fork shaft, so that the limiting groove slides along the limiting block. The limiting block can prevent the fork mouth body from rotating on the one hand, and can also play a good limiting role on the fork mouth body on the other hand, so that the gear selection is more accurate. The dual anti-rotation of the anti-rotation groove and the limiting groove can significantly improve the rotation effect of the fork mouth body and improve the accuracy of gear engagement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A three-dimensional schematic diagram of a specific embodiment of the anti-rotation fork stop provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the assembly of the fork stop body, the fork shaft and the anti-rotation rib plate;

[0022] Figure 3 for Figure 2Schematic diagram of the planing surface;

[0023] Figure 4 It is a front view schematic diagram of a specific embodiment of the anti-rotation fork stop provided by the present invention;

[0024] Figure 5 for Figure 4 Schematic cross-sectional view of A1-A1.

[0025] Among them, 1-fork mouth body, 2-anti-rotation groove, 3-limiting groove, 4-through hole, 5-threaded hole, 6-second through hole, 7-fork shaft, 8-anti-rotation rib plate, 9-bolt, 10-iron wire, 11-first through hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The core of the present invention is to provide an anti-rotation type fork stop with good anti-rotation effect.

[0028] Please refer to Figures 1 to 5 , Figure 1 A three-dimensional schematic diagram of a specific embodiment of the anti-rotation fork stop provided by the present invention; Figure 2 It is a schematic diagram of the assembly of the fork stop body, the fork shaft and the anti-rotation rib plate; Figure 3 for Figure 2 Schematic diagram of the planing surface; Figure 4 It is a front view schematic diagram of a specific embodiment of the anti-rotation fork stop provided by the present invention; Figure 5 for Figure 4 Schematic cross-sectional view of A1-A1.

[0029] The anti-rotation fork mouth provided by the present invention includes a fork mouth body 1, which is provided with a through hole 4 for inserting the fork shaft 7, the side of the fork mouth body 1 is provided with a limit groove 3 which passes through it from top to bottom and is used to slide with the limit block on the transmission housing, and the upper end surface of the fork mouth body 1 is provided with an anti-rotation groove 2 which passes through it axially along the through hole 4 and is used to insert it with the anti-rotation rib 8 on the transmission housing.

[0030] Among them, a through hole 4 is provided on the fork mouth body 1, and the through hole 4 is used to insert the fork shaft 7. The fork shaft 7 is fixedly connected to the fork mouth body 1, so that the fork mouth body 1 is driven by the fork shaft 7 to move, thereby achieving the purpose of switching gears.

[0031] An anti-rotation groove 2 is provided on the upper end surface of the fork mouth body 1, and the anti-rotation groove 2 penetrates the upper end surface of the fork mouth body 1 axially along the through hole 4, that is, the length direction of the anti-rotation groove 2 is consistent with the axial direction of the through hole 4, and correspondingly, an anti-rotation rib plate 8 is provided on the transmission housing. Specifically, the width of the anti-rotation rib plate 8 is equal to the width of the anti-rotation groove 2, so that the anti-rotation rib plate 8 can be clamped in the anti-rotation groove 2 to prevent the fork mouth body 1 from rotating, specifically, the anti-rotation rib plate 8.

[0032] A limiting groove 3 is provided on the side of the fork mouth body 1, and the limiting groove 3 runs through the fork mouth body 1 up and down. Correspondingly, a limiting block cooperating with the limiting groove 3 is provided on the transmission housing. The width of the limiting hole should be smaller than the width of the limiting groove 3 so that the limiting groove 3 can slide relative to the limiting block, so that the fork mouth body 1 can slide along the limiting block under the drive of the fork shaft 7. The limiting block can prevent the fork mouth body 1 from rotating on the one hand, and can also play a good limiting role on the fork mouth body 1 on the other hand, so that the gear selection is more accurate.

[0033] The anti-rotation type fork mouth provided by the present invention comprises a fork mouth body 1, and the upper end surface of the fork mouth body 1 is provided with an anti-rotation groove 2, and the anti-rotation groove 2 is used to cooperate with the anti-rotation rib plate 8 on the transmission housing, that is, the anti-rotation rib plate 8 on the transmission housing is inserted into the anti-rotation groove 2, so that the anti-rotation rib plate 8 clamps the fork mouth body 1 to prevent the fork mouth body 1 from rotating. In addition, a limiting groove 3 is provided on the side of the fork mouth body 1, and the limiting groove 3 cooperates with the upper limit block of the transmission housing. The fork mouth body 1 moves along the axis of the fork shaft 7 under the drive of the fork shaft 7, so that the limiting groove 3 slides along the limiting block. The limiting block can prevent the fork mouth body 1 from rotating on the one hand, and can also play a good limiting role on the fork mouth body 1 on the other hand, so that the gear selection is more accurate. Through the dual anti-rotation of the anti-rotation groove 2 and the limiting groove 3, the rotation effect of the fork mouth body 1 can be significantly improved, and the accuracy of gear engagement can be improved.

[0034] In addition, since the limiting groove 3 and the anti-rotation groove 2 are both passed through the fork stop body 1, processing is convenient, the cost of parts is reduced, and the convenience of processing the fork stop body 1 can be improved.

[0035] On the basis of the above embodiment, considering the specific setting mode of the anti-rotation groove 2, as a preferred embodiment, the anti-rotation groove 2 is a long groove with a rectangular cross section. On the basis of the above embodiment, as a preferred embodiment, the limiting groove 3 is a long groove with a rectangular cross section. In this embodiment, the limiting groove 3 and the anti-rotation groove 2 are both long grooves, and the limiting groove 3 is perpendicular to the anti-rotation groove 2. Thereby further improving the anti-rotation effect of the fork mouth body 1.

[0036] On the basis of the above embodiment, as a preferred embodiment, the fork body 1 is provided with a threaded hole 5 penetrating the through hole 4, and the threaded hole 5 is provided with a bolt 9 for fixing the fork shaft 7 in the through hole 4. The fork shaft 7 is fixed to the fork body 1 by the bolt 9, and the fork shaft 7 drives the fork body 1 to move.

[0037] On the basis of the above embodiment, as a preferred embodiment, the head of the bolt 9 is provided with a first through hole 11 for passing the iron wire 10, and the fork body 1 is provided with a second through hole 6 for passing the iron wire 10 and parallel to the through hole 4 at the lower part of the threaded hole 5. In this way, the iron wire 10 passing through the first through hole 11 and the second through hole 6 can be spirally fixed to prevent the spiral from loosening.

[0038] On the basis of the above embodiment, as a preferred embodiment, the axis of the threaded hole 5 is perpendicular to the axis of the through hole 4. The length of the anti-rotation groove 2 is equal to the diameter of the threaded hole 5. The features on the fork body 1 can be relatively simple, and the quality of the forged blank will be better. Specifically, the fork body 1 provided by the present invention can be designed as a bilaterally symmetrical structure, so that the same upper and lower molds can be used, reducing the development cost and cycle of the mold, so as to improve the convenience of processing.

[0039] On the basis of the above embodiment, as a preferred embodiment, the front end of the screw rod of the bolt 9 is provided with a cone that is inserted into the cone hole on the fork shaft 7. In order to insert the cone at the front end of the bolt 9 into the cone hole of the fork shaft 7, the reliability of the connection between the fork shaft 7 and the fork body 1 is improved. Considering the specific setting mode of the cone, the angle between the generatrix of the cone and the axis of the cone is 10-20 degrees. Specifically, the angle A between the generatrix of the cone and the axis of the cone is 15 degrees.

[0040] Correspondingly, the tapered hole on the fork shaft 7 should be compatible with the cone. In addition, a 2-3mm gap B can be left between the cone of the bolt 9 and the tapered hole on the fork shaft 7 after tightening. On the one hand, the tapered hole has a good positioning and tightening effect on the fork shaft 7 after the bolt 9 is tightened, and as the tightening force of the bolt 9 increases, the positioning and tightening effect will also be enhanced. On the other hand, leaving a 2-3mm gap B can eliminate processing errors and ensure that the contact between the bolt 9 and the fork shaft 7 is the conical surface of the tapered hole, so as to ensure the positioning and tightening effect. In addition, when the contact conical surface is worn, leaving a gap B can also ensure that the conical surface can still be contacted after tightening.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The above is a detailed introduction to the anti-rotation fork mouth provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An anti-rotation fork stop, characterized in that: The invention comprises a shift fork mouth body (1), the shift fork mouth body (1) is provided with a through hole (4) for inserting a shift fork shaft (7), the side surface of the shift fork mouth body (1) is provided with a limit groove (3) penetrating from top to bottom and used for slidingly cooperating with a limit block on a transmission housing, and the upper end surface of the shift fork mouth body (1) is provided with an anti-rotation groove (2) penetrating along the axial direction of the through hole (4) and used for inserting cooperating with an anti-rotation rib plate (8) on the transmission housing; The limiting groove (3) is a long groove with a rectangular cross section; The anti-rotation groove (2) is a long groove with a rectangular cross section; The fork body (1) is provided with a threaded hole (5) penetrating the through hole (4), and the threaded hole (5) is provided with a bolt (9) for fixing the fork shaft (7) in the through hole (4); The length of the anti-rotation groove (2) is equal to the diameter of the threaded hole (5); The front end of the screw rod of the bolt (9) is provided with a cone that fits in the cone hole on the fork shaft (7). The included angle between the generatrix of the frustum and the axis of the frustum is 10-20 degrees.

2. The anti-rotation fork stop according to claim 1, characterized in that: The limiting groove (3) is perpendicular to the anti-rotation groove (2).

3. The anti-rotation fork stop according to claim 2, characterized in that: The head of the bolt (9) is provided with a first through hole (11) for passing the iron wire (10), and the fork-blocking body (1) is provided with a second through hole (6) for passing the iron wire (10) and parallel to the through hole (4) at the lower part of the threaded hole (5).

4. The anti-rotation fork stop according to claim 3, characterized in that: The axis of the threaded hole (5) is perpendicular to the axis of the through hole (4).

Images