Shifting fork structure, gearbox and tractor

Abstract

The utility model discloses a shift fork structure, gearbox and tractor, the shift fork structure includes switching transmission ring and shift fork, switching transmission ring is meshing sleeve or synchronizer, the outer side of switching transmission ring is coaxially concavely equipped with ring groove, the both ends of shift fork are equipped with the insert that extends into the ring groove, the insert is equipped with the gear shifting fork, the gear shifting fork is equipped with the gear shifting fork, the gear shifting fork is equipped with the gear shifting fork, the gear shifting fork is equipped with the gear shifting fork, and the gear shifting fork is equipped with the gear shifting fork. Embedding holes are formed in the two ends of the shifting fork, convex shafts embedded into the embedding holes are arranged on the inserts in a protruding mode, and the inserts are embedded into the embedding holes through the convex shafts so that the inserts can be installed on the shifting fork, so that the inserts can shake to a certain degree at the corresponding ends of the shifting fork (namely the movement allowance). Therefore, hard friction between the insert and the groove wall of the ring groove can be avoided.

Description

Technical Field

[0001] The utility model belongs to the field of gearboxes, and in particular relates to a shift fork structure, a gearbox and a tractor. Background Art

[0002] At present, the domestic tractor gearbox is still mainly manual. The gear shifting during the operation of the tractor is achieved by the end of the shift fork shifting the transmission ring (synchronizer or meshing sleeve). Ordinary shift forks are generally made of cast steel and forged steel. Due to the inertia of the rotating parts during the shifting process, there is axial and radial friction between the end of the shift fork and the mating parts, so the hardness requirements, processing accuracy and installation requirements of the end of the shift fork are relatively high. In addition, the contact between steel and steel will produce vibration and knocking, which aggravates the vibration of the connecting rod and the rotating parts. The gearbox control lever often shakes and makes abnormal noises, affecting the comfort of users. Utility Model Content

[0003] In order to solve the above technical problems, one of the objectives of the utility model is to provide a shift fork structure with a simple structure and a certain movable margin of the insert to reduce the friction resistance between the insert and the switching transmission ring.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a shift fork structure, including a shift transmission ring and a shift fork, the shift transmission ring is a meshing sleeve or a synchronizer, the outer side of the shift transmission ring is coaxially recessed with a ring groove, both ends of the shift fork are provided with inserts extending into the ring groove, both ends of the shift fork are provided with embedding holes, and the insert is convexly provided with a convex shaft embedded in the embedding hole.

[0005] The beneficial effect of the above technical solution is that the insert is installed on the shift fork by embedding the insert into the embedding hole using a convex shaft, so that the insert can swing to a certain extent (i.e., the movable margin) at the corresponding end of the shift fork, thereby avoiding hard friction between the insert and the groove wall of the annular groove.

[0006] In the above technical solution, one end of the convex shaft away from the insert extends out of the embedding hole and is provided with a limiting block.

[0007] The beneficial effect of the above technical solution is that the insert is not easy to get loose at the corresponding end of the shift fork.

[0008] The cross-sections of the embedding hole and the protruding shaft in the above technical solution are non-circular.

[0009] The beneficial effect of the above technical solution is that: in this way, the cam shaft cannot rotate relative to the corresponding end of the shift fork (only the gap between the cam shaft and the embedding hole provides a slight amount of margin for movement).

[0010] In the above technical solution, the two ends of the shift fork are also respectively provided with first pin holes that are perpendicular to and interpenetrating the embedding holes, and the convex shaft is provided with a second pin hole that is perpendicular to it. The convex shaft is embedded in the corresponding embedding hole, and the first pin hole and the second pin hole are aligned and a pin is inserted.

[0011] The beneficial effect of the above technical solution is that the convex shaft can be limited in position in the corresponding embedding hole by the pin to prevent it from loosening.

[0012] The pin described in the above technical solution is an elastic pin.

[0013] The beneficial effect of the above technical solution is that it has a good tensioning effect and can reliably limit the cam shaft.

[0014] The insert in the above technical solution is a copper part or a copper alloy part.

[0015] The beneficial effect of the above technical solution is that it has good wear resistance.

[0016] In the above technical solution, the insert is in the shape of a straight bar, and the convex shaft and the insert are perpendicular to each other.

[0017] The beneficial effect of the above technical solution is that it has a simple structure.

[0018] The insert described in the above technical solution is integrally formed with the convex shaft.

[0019] The beneficial effect of the above technical solution is that it has high structural strength.

[0020] The second purpose of the utility model is to provide a gearbox with a simple structure and smooth gear shifting.

[0021] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a gearbox comprises the shift fork structure as described above.

[0022] The beneficial effect of the above technical solution is that no hard friction occurs between the insert and the wall of the annular groove during gear shifting, and the gear shifting is smooth.

[0023] The third purpose of the utility model is to provide a tractor with smooth gear shifting.

[0024] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a tractor, characterized in that it includes the gearbox as described above.

[0025] The beneficial effects of the above technical solution are: smooth gear shifting and good durability of the gear shift fork. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is a vertical view of the shift fork structure described in Example 1 of the utility model;

[0027] Figure 2 A cross-sectional view of the connection between the insert and the shift fork in Embodiment 1 of the utility model;

[0028] Figure 3 This is a schematic diagram of the assembly of the convex shaft and the embedding hole in Embodiment 1 of the present utility model;

[0029] Figure 4 This is a vertical view of the shift fork structure described in Example 2 of the utility model;

[0030] Figure 5 A cross-sectional view of the connection between the insert and the shift fork in Embodiment 2 of the utility model;

[0031] Figure 6 It is a vertical view of the insert in Example 2 of the utility model.

[0032] In the figure: 1, switching transmission ring; 11, ring groove; 2, shift fork; 21, embedding hole; 22, first pin hole; 3, insert; 31, cam shaft; 32, limit block; 33, second pin hole; 4, pin. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment provides a shift fork structure, including a switching transmission ring 1 and a shift fork 2, wherein the switching transmission ring 1 is a meshing sleeve or a synchronizer, and an annular groove 11 is coaxially recessed on the outer side of the switching transmission ring 1, and both ends of the shift fork 2 are provided with inserts 3 extending into the annular groove 11, and both ends of the shift fork 2 are provided with embedding holes 21, and the insert 3 is convexly provided with a convex shaft 31 embedded in the embedding hole 21, and the insert is installed on the shift fork by embedding the insert into the embedding hole using the convex shaft, so that the insert can have a certain shaking (i.e., movable margin) at the corresponding end of the shift fork, so as to avoid hard friction between the insert and the groove wall of the annular groove.

[0038] like Figure 2 As shown, in the above technical solution, the end of the convex shaft 31 away from the insert 3 extends out of the embedding hole 21 and is provided with a limiting block 32, so that the insert is not easy to loosen at the corresponding end of the shift fork.

[0039] like Figure 3 As shown, the cross-sections of the embedding hole 21 and the cam 31 in the above technical solution are non-circular, so that the cam cannot rotate relative to the corresponding end of the shift fork (only the gap between the cam and the embedding hole provides a slight amount of movable margin). Preferably, the embedding hole can be a square hole, the cross-section of the cam is square, and there is an annular gap between the cam and the embedding hole to allow the insert to shake.

[0040] Preferably, the insert 3 is a copper part or a copper alloy part, which has good wear resistance.

[0041] Preferably, the insert 3 is in the shape of a straight bar, and the convex shaft 31 and the insert 3 are perpendicular to each other, and the structure is simple.

[0042] Preferably, the insert 3 and the convex shaft 31 are integrally formed, and the structural strength is high.

[0043] Example 2

[0044] Same as Example 1, except that Figure 4-Figure 6As shown, in the above technical solution, both ends of the shift fork 2 are respectively provided with first pin holes 22 which are perpendicular to and interpenetrating with the embedding hole 21, and the convex shaft 31 is provided with a second pin hole 33 which is perpendicular to it. The convex shaft 31 is embedded in the corresponding embedding hole 21, and the first pin hole 22 and the second pin hole 33 are aligned and a pin 4 is inserted, so that the convex shaft can be limited in the corresponding embedding hole by the pin to prevent it from loosening.

[0045] The pin 4 described in the above technical solution is an elastic pin, which has a good tensioning effect and can securely limit the cam shaft.

[0046] In this embodiment, the aperture of the first pin hole is slightly larger than the diameter of the pin, and the pin is tightened in the second pin hole, both ends of the pin extend into the first pin hole, and there is also an annular gap between the embedding hole and the cam shaft. At this time, the insert can also swing at the corresponding end of the shift fork, thereby avoiding hard friction between the insert and the inner wall of the annular groove.

[0047] The embedding hole in this embodiment can be a round hole, and the convex shaft can be a round rod shaft, and the insert in this embodiment is more convenient for disassembly, assembly and maintenance.

[0048] Example 3

[0049] This embodiment provides a gearbox, including the shift fork structure as described in Embodiment 1 or Embodiment 2, wherein no hard friction occurs between the insert and the wall of the annular groove during gear shifting, and gear shifting is smooth.

[0050] Example 4

[0051] This embodiment provides a tractor, comprising a gearbox as described in Embodiment 3, which has smooth gear shifting and good durability of the gear shift fork.

[0052] It is obvious 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 features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shift fork structure, comprising a shift transmission ring (1) and a shift fork (2), wherein the shift transmission ring (1) is a meshing sleeve or a synchronizer, an annular groove (11) is coaxially concavely arranged on the outer side of the shift transmission ring (1), and inserts (3) extending into the annular groove (11) are arranged at both ends of the shift fork (2), characterized in that: Both ends of the shift fork (2) are provided with mounting holes (21), and the insert (3) is provided with a convex shaft (31) which is embedded in the mounting hole (21).

2. The shift fork structure according to claim 1, characterized in that: One end of the convex shaft (31) facing away from the insert (3) extends out of the embedding hole (21) and is provided with a limiting block (32).

3. The shift fork structure according to claim 2, characterized in that: The cross sections of the embedding hole (21) and the protruding shaft (31) are both non-circular.

4. The shift fork structure according to claim 1, characterized in that: The two ends of the shift fork (2) are respectively provided with first pin holes (22) which are perpendicular to and interpenetrating the embedding hole (21); the convex shaft (31) is provided with a second pin hole (33) which is perpendicular to the embedding hole (21); the convex shaft (31) is embedded in the corresponding embedding hole (21); the first pin hole (22) and the second pin hole (33) are aligned and a pin member (4) is inserted therein.

5. The shift fork structure according to claim 4, characterized in that: The pin (4) is an elastic pin.

6. The shift fork structure according to any one of claims 1 to 5, characterized in that: The insert (3) is a copper part or a copper alloy part.

7. The shift fork structure according to any one of claims 1 to 5, characterized in that: The insert (3) is in the shape of a straight bar, and the convex shaft (31) and the insert (3) are perpendicular to each other.

8. The shift fork structure according to claim 7, characterized in that: The insert (3) and the convex shaft (31) are integrally formed.

9. A gearbox, characterized in that: It comprises a shift fork structure as described in any one of claims 1 to 8.

10. A tractor, characterized in that: Comprising a gearbox as claimed in claim 9.

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