A limiting structure for the shift shaft of an engine

Abstract

The present invention provides a limiting structure for an engine shifting shaft, belonging to the technical field of engines. It solves the problem of difficult installation of the existing limiting structure. For the limiting structure of the engine shifting shaft, the engine includes a box body, a shifting shaft arranged in the box body, and a limiting plate arranged in the box body. The limiting structure includes a hinge member and a limiting groove formed on the inner wall of the box body. One end of the limiting plate is hinged to the box body through the hinge member, and the hinge member can lock the limiting plate on the box body. The limiting plate can rotate around the hinge member until a part of the limiting plate is embedded in the limiting groove, and the limiting plate is locked to the box body through the hinge member and abuts against the end face of the shifting shaft. The limiting structure of the engine shifting shaft can improve the installation convenience of the limiting structure while ensuring the use stability of the limiting structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines and relates to a limiting structure for an engine shift shaft. Background Art

[0002] A motorcycle engine includes a shifting mechanism, that is, by manually operating a shift shaft, the shift shaft drives a speed change drum to rotate, and the rotation of the speed change drum can achieve gear shifting.

[0003] As disclosed in a Chinese patent application (Patent Application No.: 201120409824.6), an engine shift positioning structure includes a shift camshaft. The right journal of the shift camshaft is supported on the right crankcase, and the left journal is supported on the left crankcase. A limiting plate and a T-shaped shift shaft are sleeved on the outer end of the left journal. A sub-sector gear shift lever and a torsion spring are press-fitted on the small-diameter section of the T-shaped shift shaft sleeve. The sub-sector gear shift lever meshes with a sector gear shift lever fixedly installed on the shift shaft for transmission. A cylindrical positioning boss extends from the right end of the T-shaped shift shaft sleeve, and the cylindrical positioning boss is concentric with the T-shaped shift shaft sleeve. A cylindrical positioning groove is formed on the end face where the shift camshaft is in contact with the right end face of the T-shaped shift shaft sleeve. The cylindrical positioning groove is concentric with the shift camshaft, and the cylindrical positioning groove and the cylindrical positioning boss are arranged correspondingly.

[0004] Although the above-mentioned structure uses a limiting plate to axially limit the shift camshaft, during the installation process, the limiting plate needs to be sequentially arranged between the T-shaped shift shaft sleeve and the shift camshaft, and the T-shaped shift shaft sleeve is fixedly connected to the shift camshaft through bolts to fix the limiting plate. As a result, the limiting plate needs to be mutually matched and assembled with the T-shaped shift shaft sleeve and the shift camshaft during the installation process, making the assembly of the limiting plate difficult and affecting the overall assembly efficiency of the shift camshaft positioning structure. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems existing in the prior art and propose a limiting structure for an engine shift shaft. The technical problem to be solved by the present invention is: how to solve the problem of difficult installation of the existing limiting structure.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A limiting structure for an engine shift shaft, the engine includes a box body, a shift shaft arranged in the box body, and a limiting plate arranged in the box body. It is characterized in that this limiting structure includes a hinge member and a limiting groove formed on the inner wall of the box body. One end of the limiting plate is hinged to the box body through the hinge member, and the hinge member can lock the limiting plate on the box body. The limiting plate can rotate around the hinge member until part of the limiting plate is embedded in the limiting groove, and the limiting plate is locked to the box body through the hinge member and abuts against the end face of the shift shaft.

[0008] Working principle: first, hinge the limit plate and the case body through a hinge, and the limit plate can rotate around the hinge until the limit plate is embedded in the limit groove, and then the limit plate is locked on the case body through the hinge. At this time, the limit plate abuts against the end face of the shift shaft, thereby realizing the axial limit of the shift shaft by the limit plate. The limit plate is first positioned on the case body by pre-positioning, and then the limit plate is rotated and embedded in the limit groove. At this time, there is always a connection between the limit plate and the case body, and the limit plate is rotated along the hinge so that the limit plate is embedded in the limit groove more quickly after rotation, without the need During the installation process, the specific position of the limit plate inserted into the limit groove is checked, so that the limit plate will be smoother in the rotation process and the installation accuracy of the limit plate will be higher and faster, avoiding the need for the limit plate to be aligned with the end face of the shift shaft and connected to the box body, which causes the installation of the limit plate to require secondary positioning, making the installation of the limit plate inconvenient. Through the setting of the hinge and the limit groove, the limit plate has two positioning points, and the fixation of the limit plate is more stable, thereby ensuring the stability of the use of the limit structure and improving the convenience of installation of the limit structure.

[0009] In the above-mentioned limiting structure of the engine shift shaft, a bearing seat is also provided in the housing, and the bearing seat is arranged on one side of the limiting plate. A positioning groove is opened on the side wall of the bearing seat, and the positioning groove has a limiting wall. The limiting plate is partially embedded in the positioning groove, and when the limiting plate swings around the hinge, the limiting wall can abut against the side wall of the limiting plate and limit the limiting plate part in the positioning groove.

[0010] After being fixed by the hinge, the bearing seat is installed in the housing, and the setting of the limit wall in the positioning groove ensures that the limit plate cannot be moved out of the positioning groove after installation and fixation, thereby improving the stability of the limit plate on the axial limitation of the shift shaft. The bearing seat is installed after the limit plate is installed, so it does not affect the installation efficiency of the limit plate. Moreover, the limit plate and the positioning groove are not tightly fitted, which makes the installation of the bearing seat more convenient, further improving the convenience of installation of the limit structure.

[0011] In the above-mentioned limiting structure of the engine shift shaft, the hinge is a bolt, the limiting plate has a hinge part hinged to the box body through the bolt and a limiting part embedded in the positioning groove, and a yielding recess is formed between the hinge part and the limiting part.

[0012] A recess is formed between the hinge portion and the limiting portion to prevent the bolt from interfering with the side wall of the bearing seat during installation, thereby making the installation of the bearing seat faster and more convenient without affecting the normal use and installation of the bearing seat.

[0013] In the above-mentioned limiting structure of the engine gear shift shaft, the positioning groove and the limiting groove are respectively located on both sides of the limiting plate, and the hinge part is arranged between the positioning groove and the limiting groove.

[0014] With this structure, the hinge part, the positioning groove and the limiting groove are at three points on the limiting plate. The limiting plate has three positioning points, and during the installation process, triangular positioning is a stable positioning method, which avoids the displacement of the limiting plate during use and further improves the installation stability of the limiting plate.

[0015] In the above-mentioned limiting structure of the engine gear shift shaft, the limiting plate also has a second limiting part embedded in the limiting groove. The side walls of the first limiting part and the second limiting part are both arc-shaped walls, and the side walls of the limiting groove and the positioning groove are both arc-shaped walls.

[0016] By setting the side walls of the first limiting part and the second limiting part as arc-shaped walls, and setting the side walls of the limiting groove and the positioning groove as arc-shaped walls, when the first limiting part is embedded into the positioning groove, it can be faster and less likely to interfere. When the second limiting part is embedded into the limiting groove, it is also less likely to interfere, further improving the installation efficiency of the limiting structure.

[0017] In the above-mentioned limiting structure of the engine gear shift shaft, the second limiting part is recessed towards the limiting plate to form a second relief notch, and the second relief notch is arranged on the side far from the second limiting part.

[0018] The setting of the second relief notch can play a role in making way, so that during the rotation of the limiting plate, the second limiting part can be quickly embedded into the limiting groove, and the side wall of the second limiting part does not collide with the groove wall of the limiting groove, further improving the installation efficiency and installation stability of the limiting structure.

[0019] In the above-mentioned limiting structure of the engine gear shift shaft, the side walls of the limiting groove are all connected to the inner wall of the box body, and the length of the notch of the limiting groove is less than the length of the second limiting part. The side wall of the positioning groove is connected to the side wall of the bearing seat, and the notch of the positioning groove is less than the length of the first limiting part.

[0020] With this structure, the first limiting part can rotate in the positioning groove, and the second limiting part can rotate in the limiting groove. Thus, when there is an error in the production process of the limiting plate, it can still limit the gear shift shaft and be installed in the box body, and can reduce the friction during the installation of the limiting plate, further improving the installation convenience of the limiting structure.

[0021] In the above-mentioned limiting structure of the engine gear shift shaft, at least one weight-reducing hole is provided in the middle of the limiting plate.

[0022] With this structure, the limiting plate can achieve lightweight design while ensuring the structural strength, improving the lightweight design effect of the engine.

[0023] In the above-mentioned limiting structure of the engine gear shift shaft, the hinge member is a limiting pin, an expandable elastic steel ball is provided on the limiting pin, an installation groove for embedding the limiting pin is provided in the box body, and a positioning hole for embedding the elastic steel ball is provided on the groove wall of the installation groove.

[0024] By first embedding the limiting pin into the installation groove, at this time the elastic steel ball of the limiting pin is not embedded in the positioning hole, and the limiting plate can rotate around the limiting pin. When the limiting plate rotates in place, the limiting pin can be pressed down to make the elastic steel ball embedded in the positioning hole, thus realizing the fixed connection between the limiting plate and the box body.

[0025] Compared with the prior art, the limiting structure of the present engine gear shift shaft has the following advantages:

[0026] 1. By first pre-positioning the limiting plate on the box body and then rotating the limiting plate to make it embedded in the limiting groove, there is always a connection relationship between the limiting plate and the box body at this time. Rotating along the hinge member makes the limiting plate rotate and then more quickly embedded in the limiting groove, without the need to check the specific position where the limiting plate is snapped into the limiting groove during the installation process, making the rotation of the limiting plate smoother and the installation accuracy of the limiting plate higher and faster.

[0027] 2. The hinge part, the positioning groove and the limiting groove are at three points on the limiting plate. The limiting plate has three positioning points, and triangular positioning is a stable positioning method during the installation process, avoiding the displacement of the limiting plate during use and further improving the stability of the installation of the limiting plate. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the assembled limiting structure of the present engine gear shift shaft.

[0029] Figure 2 It is a top view of the assembled limiting structure of the present engine gear shift shaft.

[0030] Figure 3 It is along Figure 2 The cross-sectional view taken along A-A in

[0031] Figure 4 It is Figure 3 The partial enlarged view at A in

[0032] Figure 5 It is a schematic structural diagram of the engine gear shift shaft without the assembled limiting structure.

[0033] Figure 6 It is a schematic structural diagram of the assembled limiting structure of the engine gear shift shaft in another direction.

[0034] Figure 7 It is a schematic structural diagram of the limiting plate in the limiting structure of the shift shaft of this engine.

[0035] Figure 8 It is a schematic structural diagram of the bearing seat in the limiting structure of the shift shaft of this engine.

[0036] In the figure, 1 is the box body; 11 is the limiting groove; 2 is the shift shaft; 21 is the weight-reducing groove; 3 is the limiting plate; 31 is the hinged part; 32 is the first limiting part; 33 is the first relief notch; 34 is the second limiting part; 35 is the second relief notch; 36 is the weight-reducing hole; 37 is the observation hole; 4 is the hinge piece; 5 is the bearing seat; 51 is the positioning groove; 51a is the limiting wall. Specific implementation mode

[0037] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0038] Embodiment 1

[0039] As Figure 1 shown, the limiting structure of the shift shaft of this engine, the engine includes a box body 1, a shift shaft 2 arranged in the box body 1, and a limiting plate 3 arranged in the box body 1.

[0040] Specifically, as Figures 1-8 shown, this limiting structure includes a hinge piece 4 and a limiting groove 11 opened on the inner wall of the box body 1. One end of the limiting plate 3 is hinged to the box body 1 through the hinge piece 4, and the hinge piece 4 can lock the limiting plate 3 on the box body 1. The limiting plate 3 can rotate around the hinge piece 4 until part of the limiting plate 3 is embedded in the limiting groove 11, and the limiting plate 3 is locked to the box body 1 through the hinge piece 4 and abuts against the end face of the shift shaft 2.

[0041] Working principle: First, the limiting plate 3 is hinged to the box body 1 through the hinge member 4. The limiting plate 3 can rotate around the hinge member 4 until it is embedded in the limiting groove 11. Then, the limiting plate 3 is locked to the box body 1 through the hinge member 4. At this time, the limiting plate 3 abuts against the end face of the shift shaft 2, thus realizing the axial limit of the shift shaft 2 by the limiting plate 3. By first pre-positioning the limiting plate 3 on the box body 1 and then rotating the limiting plate 3 so that the limiting plate 3 is embedded in the limiting groove 11, there is always a connection relationship between the limiting plate 3 and the box body 1 at this time. Rotating along the hinge member 4 makes the limiting plate 3 rotate and then more quickly embed into the limiting groove 11, without the need to check the specific position where the limiting plate 3 is clamped into the limiting groove 11 during the installation process, making the rotation of the limiting plate 3 smoother and the installation accuracy of the limiting plate 3 higher and faster. It avoids the need for secondary positioning of the limiting plate 3 due to the need to align the limiting plate 3 with the end face of the shift shaft 2 and connect it to the box body 1, thus making the installation of the limiting plate 3 inconvenient. And through the settings of the hinge member 4 and the limiting groove 11, the limiting plate 3 has two positioning points, and the fixation of the limiting plate 3 is more stable, so that the convenience of installing the limiting structure can be improved while ensuring the use stability of the limiting structure.

[0042] As Figures 3-8 shown, a bearing seat 5 is further provided in the box body 1. The bearing seat 5 is arranged on one side of the limiting plate 3. A positioning groove 51 is formed on the side wall of the bearing seat 5. The positioning groove 51 has a limiting wall 51a. The limiting plate 3 is partially embedded in the positioning groove 51. When the limiting plate 3 swings around the hinge member 4, the limiting wall 51a can abut against the side wall of the limiting plate 3 and partially limit the limiting plate 3 in the positioning groove 51.

[0043] As Figure 4 、 Figure 6 and Figure 7 shown, the hinge member 4 is a bolt. The limiting plate 3 has a hinge portion 31 hinged to the box body 1 through the bolt, a first limiting portion 32 embedded in the positioning groove 51, and a second limiting portion 34 embedded in the limiting groove 11. A first relief notch 33 is formed between the hinge portion 31 and the first limiting portion 32. The second limiting portion 34 is recessed toward the limiting plate 3 to form a second relief notch 35. The second relief notch 35 is arranged on the side away from the second limiting portion 34.

[0044] As Figures 1-8As shown in the figure, the positioning groove 51 and the limiting groove 11 are respectively located on both sides of the limiting plate 3. The hinged part 31 is arranged between the positioning groove 51 and the limiting groove 11. The side walls of the first limiting part 32 and the second limiting part 34 are both arc-shaped walls. The side walls of the limiting groove 11 and the positioning groove 51 are both arc-shaped walls. Both sides of the side wall of the limiting groove 11 are connected to the inner wall of the box body 1, and the length of the notch of the limiting groove 11 is less than the length of the second limiting part 34. Both sides of the groove wall of the positioning groove 51 are connected to the side wall of the bearing seat 5, and the notch of the positioning groove 51 is less than the length of the first limiting part 32. At least one weight-reducing hole 36 is opened in the middle of the limiting plate 3.

[0045] As Figure 7 shown, an observation hole 37 is also opened on the limiting plate 3. The observation hole 37 can be located above the shift shaft 2. A weight-reducing groove 21 is opened on the shift shaft 2. When the limiting plate 3 rotates, due to the arrangement of the observation hole 37, the shift shaft 2 can be exactly located below the limiting plate 3, and the shift shaft 2 abuts against the limiting plate 3, improving the installation efficiency and stability of the limiting structure.

[0046] Embodiment 2

[0047] This embodiment is basically the same as Embodiment 1, and the difference lies in:

[0048] The hinge 4 is a limit pin. An expandable elastic steel ball is provided on the limit pin. An installation groove for the limit pin to be embedded is provided in the box body 1, and a positioning hole for the elastic steel ball to be embedded is provided on the groove wall of the installation groove.

[0049] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A limiting structure for the shift shaft of an engine. The engine includes a housing (1), a shift shaft (2) disposed within the housing (1), and a limiting plate (3) disposed within the housing (1). It is characterized in that, This limiting structure includes a hinge member (4) and a limiting groove (11) formed on the inner wall of the box body (1). One end of the limiting plate (3) is hinged to the box body (1) through the hinge member (4), and the hinge member (4) can lock the limiting plate (3) on the box body (1). The limiting plate (3) can rotate around the hinge member (4) until a part of the limiting plate (3) is embedded in the limiting groove (11), and the limiting plate (3) is locked to the box body (1) through the hinge member (4) and abuts against the end face of the shift shaft (2).

2. The limiting structure for the shift shaft of an engine according to claim 1, characterized in that, A bearing seat (5) is further provided in the box body (1). The bearing seat (5) is arranged on one side of the limiting plate (3). A positioning groove (51) is formed on the side wall of the bearing seat (5). The positioning groove (51) has a limiting wall (51a). A part of the limiting plate (3) is embedded in the positioning groove (51). When the limiting plate (3) swings around the hinge member (4), the limiting wall (51a) can abut against the side wall of the limiting plate (3) and limit a part of the limiting plate (3) in the positioning groove (51).

3. The limiting structure for the shift shaft of an engine according to claim 2, characterized in that, The hinge member (4) is a bolt. The limiting plate (3) has a hinge portion (31) hinged to the box body (1) through the bolt and a first limiting portion (32) embedded in the positioning groove (51). A first relief notch (33) is formed between the hinge portion (31) and the first limiting portion (32).

4. The limiting structure for the shift shaft of an engine according to claim 3, characterized in that, The positioning groove (51) and the limiting groove (11) are respectively located on both sides of the limiting plate (3). The hinge portion (31) is arranged between the positioning groove (51) and the limiting groove (11).

5. The limiting structure for the shift shaft of an engine according to claim 3, characterized in that, The limiting plate (3) further has a second limiting portion (34) embedded in the limiting groove (11). The side walls of the first limiting portion (32) and the second limiting portion (34) are both arc-shaped walls. The side walls of the limiting groove (11) and the positioning groove (51) are both arc-shaped walls.

6. The limiting structure for the shift shaft of an engine according to claim 5, characterized in that, The second limiting portion (34) is recessed towards the limiting plate (3) to form a second relief notch (35). The second relief notch (35) is arranged on the side away from the second limiting portion (34).

7. The limiting structure for the shift shaft of an engine according to claim 5, characterized in that, Both sides of the side wall of the limiting groove (11) are connected to the inner wall of the box body (1), and the notch length of the limiting groove (11) is smaller than the length of the second limiting portion (34). Both sides of the wall of the positioning groove (51) are connected to the side wall of the bearing seat (5), and the notch of the positioning groove (51) is smaller than the length of the first limiting portion (32).

8. The limiting structure for the shift shaft of an engine according to any one of claims 1-7, characterized in that, At least one weight-reducing hole (36) is formed in the middle of the limiting plate (3).

9. The limiting structure for the shift shaft of an engine according to any one of claims 1-7, characterized in that, The hinge member (4) is a limit pin. The limit pin is provided with a retractable elastic steel ball. An installation groove for the limit pin to be embedded is formed in the box body (1). A positioning hole for the elastic steel ball to be embedded is formed on the wall of the installation groove.

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