Timing gear fixing device for replacing automobile synchronous belt and adjusting synchronous pulley

Abstract

The utility model provides a timing gear fixing device for replacing an automobile synchronous belt and adjusting a synchronous pulley. The timing gear fixing device comprises a main body fixing piece, a second extrusion piece, a connecting rod and an extrusion piece, wherein the main body fixing piece is provided with a first extrusion piece, and the first extrusion piece is provided with a first extrusion flange; the second extrusion part is opposite to the first extrusion part and is provided with a second extrusion flange; one end of the connecting rod is connected with the second extrusion part, and the other end extends outside the first extrusion part; and the extruding piece is in threaded connection with the part, extending to the outer side of the first extruding piece, of the connecting rod, and can inwards rotate to extrude the first extruding piece. During use, the second extrusion part is adjusted to a proper position, then the main body fixing part is arranged between the two synchronous belt wheels, and then the extrusion part is rotated inwards until the synchronous belt wheels are extruded and fixed by the first extrusion flange and the second extrusion flange. The fixing device disclosed by the utility model can be adjusted according to the size of the synchronous belt wheel, so that the fixing device can be adaptive to and fix various synchronous belt wheels with different sizes, and the application range is widened.

Description

Technical Field

[0001] This utility model relates to the technical field of timing belt pulley repair tools, specifically to a timing gear fixing device for replacing automotive timing belts and adjusting timing belt pulleys. Background Technology

[0002] A synchronous belt pulley is a transmission device that transmits power via a synchronous belt. It consists of an annular belt with teeth spaced at equal intervals on its inner surface and a pulley with corresponding teeth. During operation, the belt teeth mesh with the pulley teeth to transmit motion and power. Synchronous belt pulley drives are a new type of transmission that combines the advantages of belt drives, chain drives, and gear drives.

[0003] In the timing system of a car engine, the timing pulley plays a crucial role. The main function of the timing system is to ensure the opening and closing times of the engine valves, ensuring efficient combustion of fuel in the cylinders. The timing pulley works in conjunction with the timing belt; the meshing of the teeth on the pulley and the timing belt accurately transmits power from the crankshaft to the camshaft. Specifically, in some four-stroke engines, the camshaft rotates once for every two crankshaft rotations, ensuring the correct opening and closing times of the valves during the intake and exhaust strokes. If the timing pulley malfunctions, such as worn teeth or a broken timing belt, valve timing will become incorrect, potentially leading to reduced engine power, vibration, or even failure to start. Therefore, regular inspection and timely replacement of the timing belt are essential.

[0004] When replacing a timing belt, to prevent displacement of the timing pulleys and changes in the transmission ratio that could affect the normal operation of the engine, the timing pulleys must be securely fixed. (Reference) Figure 5 and Figure 6 As shown, the tool currently used to fix the timing pulleys needs to be installed between two timing pulleys during use, and the toothed grooves on both sides need to be precisely matched with the teeth of the timing pulleys. However, the problem with this tool is that the precise matching of the toothed grooves with the teeth is only applicable to specific models of timing pulleys, which limits its applicability. In addition, the tool is prone to falling off the timing pulleys, has poor stability, and if it falls off accidentally, it will affect the replacement of the timing belt.

[0005] Therefore, how to design a timing gear fixing device for replacing automotive synchronous belts and adjusting synchronous pulleys that is applicable to multiple models, does not easily fall off, and has high stability is a technical problem that has not yet been solved in the existing technology. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is to overcome the technical defects of existing timing belt pulley fixing tools, which are limited to specific models of timing belt pulleys, have a narrow range of applications and poor stability. This invention provides a timing gear fixing device for automotive timing belt replacement and timing belt pulley adjustment that is applicable to multiple models and has high stability.

[0007] Therefore, this utility model provides a timing gear fixing device for replacing automotive timing belts and adjusting timing belt pulleys, comprising:

[0008] The main body fixing component has a limit slide rail installed on its top surface and a first extrusion component fixedly installed at one end. At least one first extrusion flange is provided on each of the two sides of the first extrusion component.

[0009] The second extrusion member is opposite to the first extrusion member and is movably mounted on the main body fixing member via the limiting slide rail; at least one second extrusion flange is provided on each of the two sides of the second extrusion member, and the bottom has a limiting groove that runs through both sides, the limiting groove being able to match and be installed with the limiting slide rail;

[0010] The connecting rod has one end fixedly connected to the second extrusion member, and the other end extends to the outside of the first extrusion member;

[0011] The clamping member is screwed onto the portion of the connecting rod that extends to the outside of the first extrusion member. It can rotate inward to squeeze the first extrusion member, thereby driving the second extrusion member to move closer to the first extrusion member.

[0012] As a preferred embodiment, the first extruder has a stepped design on both sides, with a first extrusion flange, a third extrusion flange and a fifth extrusion flange formed from bottom to top; the second extruder has a stepped design on both sides, with a second extrusion flange, a fourth extrusion flange and a sixth extrusion flange formed from bottom to top.

[0013] As a preferred embodiment, a reset structure is also included, the reset structure comprising:

[0014] A long through hole is formed on the main body fixing component;

[0015] A reset baffle is movably disposed at the bottom of the main body fixing member and is fixedly connected to the bottom of the second pressing member;

[0016] A reset rod passes through the reset baffle and is installed at the bottom of the main body fixing member;

[0017] An elastic element is sleeved on the portion of the reset rod located between the main body fixing member and the reset baffle, and is located outside the second pressing member.

[0018] As a preferred embodiment, there are two elongated through holes, which are parallel to each other on both sides of the limiting slide rail; the second extrusion member has two internally threaded holes at the bottom of both sides of the limiting slide rail, which are opposite to the elongated through holes; the reset baffle has a connecting hole at the position opposite to the internally threaded hole; the connecting bolt passes through the connecting hole and the elongated through hole and is screwed into the internally threaded hole, thereby fixing the reset baffle to the bottom of the second extrusion member.

[0019] As a preferred embodiment, the main body fixing member has a first mounting plate at one end and a second mounting plate at the bottom of the other end. The first mounting plate has a mounting hole, and the second mounting plate has a threaded through hole opposite to the mounting hole. The reset rod passes through the mounting hole and is screwed into the threaded through hole, thereby being fixedly installed at the bottom of the main body fixing member.

[0020] As a preferred embodiment, it also includes limiting baffles, integrally formed on both sides of the main body fixing member and extending downward, with the reset baffle installed between the limiting baffles.

[0021] As a preferred embodiment, the limiting slide rail is provided with guide grooves on both sides, and guide sliders are provided on the inner walls of both sides of the limiting grooves. The guide sliders can be matched and installed with the guide grooves and can move along the guide grooves.

[0022] As a preferred embodiment, one end of the connecting rod is provided with a connecting shaft, and a section of the outer wall of the other end is provided with an external thread, and the outer wall of the connecting shaft is provided with an external thread;

[0023] The first extrusion member has a first fixing hole, and the second extrusion member has a second fixing hole opposite to the first fixing hole; the connecting rod has a connecting shaft at one end that passes through the first fixing hole and the second fixing hole, and the nut is screwed to the connecting shaft; the clamping member is screwed to the other end of the connecting rod, thereby fixing the connecting rod, the first extrusion member and the second extrusion member together.

[0024] As a preferred embodiment, a limiting protrusion is provided on the inner wall of the second fixing hole, and an elongated limiting groove is provided on the connecting shaft. The limiting protrusion can be matched and installed with the elongated limiting groove to limit the connecting rod.

[0025] As a preferred embodiment, the outer wall of the clamping member is provided with anti-slip texture.

[0026] The technical solution provided by this utility model has the following advantages:

[0027] This utility model discloses a timing gear fixing device for replacing and adjusting timing belt pulleys in automobiles, comprising a main fixing component, a second pressing component, a connecting rod, and a clamping component. The main fixing component has a limiting slide rail mounted on its top surface, and a first pressing component fixedly mounted at one end. At least one first pressing flange is provided on each of the two sides of the first pressing component. The second pressing component is opposite to the first pressing component and is movably mounted on the main fixing component via the limiting slide rail. At least one second pressing flange is provided on each of the two sides of the second pressing component, and a limiting groove penetrating both sides is provided at the bottom, allowing it to be matched with the limiting slide rail. One end of the connecting rod is fixedly connected to the second pressing component, and the other end extends to the outside of the first pressing component. The clamping component is screwed onto the portion of the connecting rod extending to the outside of the first pressing component, and can rotate inward to press the first pressing component, thereby causing the second pressing component to move closer to the first pressing component.

[0028] When using the timing gear fixing device for replacing and adjusting synchronous belt pulleys in automobiles according to this invention, first adjust the second pressing member to a suitable position so that the synchronous pulley can be placed between the first and second pressing members. After adjustment, place the main fixing member between the two synchronous pulleys, aligning the first and second pressing flanges on both sides with the teeth of the synchronous pulleys. Then, rotate the clamping member inward, and through the connecting rod, drive the second pressing member to move closer to the first pressing member until the first and second pressing flanges clamp and fix the synchronous pulley. The timing gear fixing device for replacing and adjusting synchronous belt pulleys in automobiles according to this invention can be flexibly adjusted according to the size of the synchronous pulley, thereby adapting to and fixing synchronous pulleys of various sizes, thus broadening the application range. In addition, the inward clamping method of the synchronous pulley improves stability. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the prior art or specific embodiments of this utility model, the accompanying drawings used in the description of the prior art or specific embodiments are briefly introduced below.

[0030] Figure 1 This is a schematic diagram of the fixing device of this utility model installed on the synchronous pulley.

[0031] Figure 2 This is a schematic diagram of the overall structure of the timing gear fixing device for replacing and adjusting the timing belt pulley in automobiles, which is a utility model.

[0032] Figure 3 yes Figure 1 A schematic diagram of the explosion structure.

[0033] Figure 4 yes Figure 3 Another stereoscopic view.

[0034] Figure 5 This is a schematic diagram of a tool currently used to fix a timing belt pulley.

[0035] Figure 6 This is a schematic diagram of installing an existing fixing tool on a timing pulley.

[0036] Reference numerals: 1. Main body fixing component; 11. Limiting slide rail; 12. First mounting plate; 13. Second mounting plate; 14. Mounting hole; 15. Threaded through hole; 16. Guide slide groove; 2. First extrusion component; 21. First extrusion flange; 22. Third extrusion flange; 23. Fifth extrusion flange; 24. First fixing hole; 3. Second extrusion component; 31. Second extrusion flange; 32. Limiting groove; 33. Fourth extrusion flange; 34. Sixth extrusion flange; 35. Internal threaded hole; 36. Guide slider; 37. Second fixing hole; 38. Limiting protrusion; 4. Connecting rod; 41. Connecting shaft; 5. Clamping component; 6. Long through hole; 61. Reset baffle; 62. Reset rod; 63. Elastic component; 64. Connecting hole; 65. Connecting bolt; 7. Limiting baffle; 8. Nut. Detailed Implementation

[0037] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0038] It should be noted that the terms "first," "second," etc., in the claims and specification of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such as a process, method, system, product, or device that includes a series of steps or units, not limited to those steps or units explicitly listed, but may also include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0039] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the term "multiple" should mean two or more. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0040] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0041] This embodiment provides a timing gear fixing device for replacing automotive timing belts and adjusting timing belt pulleys, such as... Figure 1-4 As shown, it includes: a main fixing member 1, a second extrusion member 3, a connecting rod 4, and a clamping member 5; wherein, a limiting slide rail 11 is installed on the top surface of the main fixing member 1, and a first extrusion member 2 is fixedly provided at one end, and at least one first extrusion flange 21 is provided on both sides of the first extrusion member 2; the second extrusion member 3 is opposite to the first extrusion member 2 and is movably installed on the main fixing member 1 through the limiting slide rail 11; at least one second extrusion flange 31 is provided on both sides of the second extrusion member 3, and a limiting groove 32 penetrating both sides is provided at the bottom, and the limiting groove 32 can be matched and installed with the limiting slide rail 11; one end of the connecting rod 4 is fixedly connected to the second extrusion member 3, and the other end extends to the outside of the first extrusion member 2; the clamping member 5 is screwed onto the part of the connecting rod 4 that extends to the outside of the first extrusion member 2, and can rotate inward to squeeze the first extrusion member 2, thereby driving the second extrusion member 3 to move closer to the first extrusion member 2.

[0042] When using the timing gear fixing device for replacing and adjusting automotive timing belt pulleys according to this embodiment, first adjust the second pressing member 3 to an appropriate position so that the timing pulley can be placed between the first pressing member 2 and the second pressing member 3. After adjustment, place the main fixing member 1 between the two timing pulleys so that the first pressing flange 21 and the second pressing flange 31 on both sides are aligned with the teeth of the timing pulleys. Then, rotate the clamping member 5 inward, and drive the second pressing member 3 to move closer to the first pressing member 2 through the connecting rod 4 until the first pressing flange 21 and the second pressing flange 31 clamp and fix the timing pulley. The timing gear fixing device for replacing and adjusting automotive timing belt pulleys according to this embodiment can be flexibly adjusted according to the size of the timing pulley, thereby adapting to and fixing various timing pulleys of different sizes, thus broadening the application range. In addition, the inward clamping method of the timing pulley improves stability.

[0043] The first extrusion member 2 has a stepped design on both sides, with a first extrusion flange 21, a third extrusion flange 22, and a fifth extrusion flange 23 formed from bottom to top; the second extrusion member 3 has a stepped design on both sides, with a second extrusion flange 31, a fourth extrusion flange 33, and a sixth extrusion flange 34 formed from bottom to top. When applied to synchronous pulleys of different sizes, appropriate flanges can be selected for fixed installation according to the specific size of the synchronous pulley, thereby further expanding the application range and applicability.

[0044] like Figure 3-4 As shown, it also includes a reset structure, which includes an elongated through hole 6, a reset baffle 61, a reset rod 62, and an elastic element 63. The elongated through hole 6 is formed on the main fixing member 1. The reset baffle 61 is movably disposed at the bottom of the main fixing member 1 and fixedly connected to the bottom of the second pressing member 3. The reset rod 62 passes through the reset baffle 61 and is installed at the bottom of the main fixing member 1. The elastic element 63 is sleeved on the portion of the reset rod 62 located between the main fixing member 1 and the reset baffle 61, and is located outside the second pressing member 3. In use, pulling the reset baffle 61 outward can move the second pressing member 3 to a suitable position. When the second pressing member 3 is moved to the appropriate position, releasing the reset baffle 61 allows the second pressing member 3 to automatically reset under the action of the elastic element 63. This reset structure eliminates the need for manual adjustment of the reset, making operation more convenient and efficient.

[0045] Two elongated through holes 6 are provided, parallel to each other on both sides of the limiting slide rail 11; the second extrusion member 3 has two internal threaded holes 35 at the bottom of both sides of the limiting slide rail 11, which are opposite to the elongated through holes 6; the reset baffle 61 has a connecting hole 64 at the position opposite to the internal threaded hole 35; the connecting bolt 65 passes through the connecting hole 64 and the elongated through hole 6 and is screwed into the internal threaded hole 35, thereby fixing the reset baffle 61 to the bottom of the second extrusion member 3.

[0046] One end of the main body fixing member 1 is provided with a first mounting plate 12, and the bottom of the other end is provided with a second mounting plate 13. The first mounting plate 12 is provided with a mounting hole 14, and the second mounting plate 13 is provided with a threaded through hole 15 opposite to the mounting hole 14. The reset rod 62 passes through the mounting hole 14 and is screwed into the threaded through hole 15, thereby being fixedly installed at the bottom of the main body fixing member 1.

[0047] It also includes limiting baffles 7, which are integrally formed on both sides of the main body fixing member 1 and extend downward. The reset baffle 61 is installed between the limiting baffles 7. The main function of the limiting baffles 7 is to limit the movement range of the reset baffle 61, thereby enhancing the stability of the reset baffle 61 and preventing wobbling or displacement during use.

[0048] The limiting slide rail 11 has guide grooves 16 on both sides, and guide sliders 36 are provided on the inner walls of both sides of the limiting groove 32. The guide sliders 36 can be matched and installed with the guide grooves 16 and can move along the guide grooves 16.

[0049] One end of the connecting rod 4 is provided with a connecting shaft 41, and a section of the outer wall of the other end is provided with an external thread, and the outer wall of the connecting shaft 41 is also provided with an external thread; the first extrusion member 2 is provided with a first fixing hole 24, and the second extrusion member 3 is provided with a second fixing hole 37 opposite to the first fixing hole 24; after the connecting shaft 41 of the connecting rod 4 passes through the first fixing hole 24 and the second fixing hole 37, the nut 8 is screwed to the connecting shaft 41, and the clamping member 5 is screwed to the other end of the connecting rod 4, thereby fixing the connecting rod 4, the first extrusion member 2 and the second extrusion member 3 together.

[0050] A limiting protrusion 38 is provided on the inner wall of the second fixing hole 37, and an elongated limiting groove is provided on the connecting shaft 41. The limiting protrusion 38 can be matched and installed with the elongated limiting groove to limit the connecting rod 4.

[0051] The outer wall of the clamping member 5 is provided with anti-slip texture, which can increase the friction between the hand and the contact surface of the clamping member 5, and increase the stability of the user's grip.

[0052] The timing gear fixing device for replacing and adjusting timing belt pulleys in this embodiment is used as follows: When using the timing gear fixing device for replacing and adjusting timing belt pulleys in this embodiment, first pull the reset baffle 61 outward to move the second pressing member 3 to an appropriate position; after the second pressing member 3 moves to the appropriate position, place the main fixing member 1 between the two timing pulleys so that the first pressing flange 21 and the second pressing flange 31 on both sides are aligned with the gear teeth of the timing pulley; then release the reset baffle 61, and the reset baffle 61, under the action of the elastic member 63, drives the second pressing member 3 to automatically return to its original position and press the timing pulley; after the second pressing member 3 presses the timing pulley, rotate the clamping member 5 inward, and drive the second pressing member 3 to move closer to the first pressing member 2 through the connecting rod 4 until the first pressing flange 21 and the second pressing flange 31 clamp and fix the timing pulley.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this innovative technical solution.

Claims

1. A timing gear fixing device for replacing automotive timing belts and adjusting timing belt pulleys, characterized in that, The utility model relates to a kind of extrusion structures of fixed body, including: Main body fixing part (1), top surface is equipped with limit slide rail (11) on, one end is fixedly provided with first extrusion part (2), the both sides of the first extrusion part (2) are respectively provided with at least one first extrusion flange (21); Second extrusion part (3), with the first extrusion part (2) opposite, and movably installed on the main body fixing part (1) by the limit slide rail (11);The both sides of the second extrusion part (3) are respectively provided with at least one second extrusion flange (31), and the bottom has the limit slot (32) passing through both sides, the limit slot (32) can be matched with the limit slide rail (11) installation; Connecting rod (4), one end is fixedly connected with the second extrusion part (3), and the other end is stretched to the outside of the first extrusion part (2); Extrusion part (5), screwed on the part of the connecting rod (4) that is stretched to the outside of the first extrusion part (2), can be rotated extrusion the first extrusion part (2) inwards, to drive the second extrusion part (3) to the position close to the first extrusion part (2) movement.

2. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 1, characterized in that: The both sides of the first extrusion part (2) are designed in ladder shape, and the first extrusion flange (21), third extrusion flange (22) and fifth extrusion flange (23) are formed from bottom to top;The both sides of the second extrusion part (3) are designed in ladder shape, and the second extrusion flange (31), fourth extrusion flange (33) and sixth extrusion flange (34) are formed from bottom to top.

3. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 1, characterized in that, Also including reset structure, the reset structure includes: Long strip through-hole (6), is set on the main body fixing part (1); Reset baffle (61), movably arranged at the bottom of the main body fixing part (1), and fixedly connected with the bottom of the second extrusion part (3); Reset rod (62), passes through reset baffle (61) and is installed at the bottom of the main body fixing part (1); Elastic member (63), is sleeved on the part of reset rod (62) between the main body fixing part (1) and reset baffle (61), and is located at the outside of the second extrusion part (3).

4. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 3, characterized in that: The long strip through-hole (6) is two, parallelly set on the both sides of the limit slide rail (11);The second extrusion part (3) is located at the bottom of the both sides of the limit slide rail (11) and is provided with two internal thread holes (35) opposite with the long strip through-hole (6);Reset baffle (61) is provided with connecting hole (64) on the position opposite with the internal thread hole (35);After connecting bolt (65) passes through connecting hole (64) and long strip through-hole (6), it is screwed with internal thread hole (35), so that reset baffle (61) is fixedly connected at the bottom of the second extrusion part (3).

5. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 3, characterized in that: The main body fixing part (1) is provided with a first mounting plate (12) at one end and a second mounting plate (13) at the other end, the first mounting plate (12) is provided with a mounting hole (14), the second mounting plate (13) is provided with a threaded hole (15) opposite to the mounting hole (14), and the reset rod (62) is screwed with the threaded hole (15) after passing through the mounting hole (14), so as to be fixedly installed at the bottom of the main body fixing part (1).

6. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 3, characterized in that: The limiting baffle (7) is integrally formed on both sides of the main body fixing part (1) and extends downward, and the reset baffle (61) is installed between the limiting baffles (7).

7. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 1, characterized in that: The limiting slide rail (11) is provided with a guide sliding groove (16) on both sides, the limiting groove (32) is provided with a guide sliding block (36) on the inner wall of both sides, the guide sliding block (36) can be matched and installed with the guide sliding groove (16) and can move along the guide sliding groove (16).

8. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 1, characterized by: One end of the connecting rod (4) is provided with a connecting shaft (41), and the outer wall of the other end is provided with external threads, and the outer wall of the connecting shaft (41) is provided with external threads; The first extrusion piece (2) is provided with a first fixing hole (24), and the second extrusion piece (3) is provided with a second fixing hole (37) opposite to the first fixing hole (24); one end of the connecting rod (4) provided with the connecting shaft (41) passes through the first fixing hole (24) and the second fixing hole (37), and then the nut (8) is screwed with the connecting shaft (41), and the extrusion piece (5) is screwed with the other end of the connecting rod (4), so as to fixedly connect the connecting rod (4), the first extrusion piece (2) and the second extrusion piece (3) together.

9. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 8, characterized in that: The inner wall of the second fixing hole (37) is provided with a limiting protrusion (38), and the connecting shaft (41) is provided with a long limiting groove, and the limiting protrusion (38) can be matched and installed with the long limiting groove, so as to limit the connecting rod (4).

10. The timing gear fixing device for automobile synchronous belt replacement and synchronous pulley adjustment according to claim 1, characterized by: The outer wall of the extrusion piece (5) is provided with anti-skid texture.

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