Pressing fixture for camshaft

Abstract

This utility model discloses a press-fit fixture for a camshaft, relating to the field of fixtures. It includes a mounting bracket, which consists of a base plate, an L-shaped bracket, and a guide rod. Two L-shaped brackets are symmetrically and fixedly installed at the lower end of the base plate. The guide rod is fixedly installed inside the base plate. A first limiting component is movably mounted on the base plate. The first limiting component consists of a lead screw, a retaining ring, a rotating handle, a movable support plate, and an arc-shaped top plate. By setting up a fixture composed of the mounting bracket, the first limiting component, and the second limiting component, the fixture can not only clamp and fix the camshaft on the shaft holding the camshaft, but also abut against the inner end of the cam of the camshaft, providing axial support force to the camshaft, thereby further fixing the camshaft. This prevents the camshaft from slipping when subjected to a large axial pressing force during the pressing of parts onto the camshaft, ultimately reducing the probability of the camshaft being scratched and scrapped.

Description

Technical Field

[0001] This utility model relates to the field of clamps, and in particular to a press-fit clamp for a camshaft. Background Technology

[0002] The camshaft is a key component in an internal combustion engine, primarily responsible for controlling the opening and closing of the valves. It is typically made of high-quality alloy steel, with a complex shape and precision machining. It is mounted on the engine's cylinder head or block via camshaft bearings and connected to the crankshaft via a timing chain, gears, or other transmission devices. When the engine is running, the camshaft adjusts the valve opening and closing timing according to the engine speed and load, ensuring fuel enters and leaves the cylinder at the correct time, thereby improving engine performance and efficiency. Camshafts are widely used in internal combustion engines in automobiles, agricultural machinery, and construction machinery, and are an indispensable component in modern industry. Traditional camshaft manufacturing methods mainly involve integral forging or casting, with the cam and shaft as a single unit. This type of camshaft has the following disadvantages: due to the numerous machining processes following the camshaft, the machining allowance is large, resulting in a heavy overall camshaft, significant material waste, and inconvenient manufacturing. Currently, assembled camshafts are more commonly used, requiring the pressing of other irregular parts, such as signal wheels, square cams, steel balls, and cup plugs, onto the end of the camshaft.

[0003] The aforementioned irregular parts are typically press-fitted onto camshaft assembly fixtures. The fixture holds the camshaft surface, thus fixing the camshaft. The press-fitting component presses the irregular parts onto the camshaft. During press-fitting, the camshaft is subjected to a significant axial pressing force. Once this force is applied to one end of the camshaft, it is transmitted to the entire camshaft. This can cause relative slippage on the camshaft surface held by the fixture. If relative slippage occurs, it will cause scratches on the camshaft surface, rendering the camshaft unusable. Utility Model Content

[0004] The main objective of this invention is to provide a press-fit fixture for camshafts, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A camshaft press-fit fixture includes a mounting bracket, which consists of a base plate, an L-shaped bracket, and a guide rod. Two L-shaped brackets are symmetrically and fixedly mounted on the lower end of the base plate. The guide rod is fixedly mounted inside the base plate. A first limiting assembly is movably mounted on the base plate. The first limiting assembly consists of a lead screw, a retaining ring, a rotating handle, a movable support plate, and an arc-shaped top plate. The retaining ring is fixedly sleeved on the lead screw, and the rotating handle is fixedly mounted on one end of the lead screw. Two movable support plates are symmetrically mounted on two lead screws, and two arc-shaped top plates are respectively fixedly mounted on the outer ends of the two movable support plates. A second limiting assembly is slidably mounted on the guide rod. The second limiting assembly is also fixedly mounted on one end of the movable support plate. The second limiting assembly consists of a movable plate, a cylinder, a pressure plate, a mounting bracket, and a pressure block. The cylinder is fixedly inserted into the movable plate, the pressure plate is fixedly mounted on the upper end of the cylinder's telescopic rod, the mounting bracket is fixedly mounted on the lower end of the pressure plate, and the pressure block is fixedly mounted on the lower end of the mounting bracket.

[0007] Preferably, the mounting bracket has a mounting groove on its base plate that extends vertically through the base plate. A blind hole is formed on the inner wall of the mounting groove. A through hole is formed at one end of the base plate and communicates with the mounting groove. The blind hole and the through hole are coaxial. The guide rod is fixedly mounted on the inner wall of the mounting groove.

[0008] Preferably, the lead screw on the first limiting component is rotatably installed in the mounting groove, blind hole and through hole, the retaining ring is located in the mounting groove and simultaneously contacts the inner wall of the mounting groove, and the rotating handle is located on one side of the substrate.

[0009] Preferably, the movable support plate on the first limiting component has a threaded hole, the movable support plate is movably installed in the mounting groove, the movable support plate is also installed on the lead screw through the threaded hole, and the upper end of the movable support plate has a first arc-shaped groove.

[0010] Preferably, the movable plate on the second limiting component is slidably installed in the mounting groove. The movable plate has a mounting hole, and the movable plate is slidably installed on the guide rod through the mounting hole. The movable plate is also fixedly connected to the movable support plate.

[0011] Preferably, the pressure block on the second limiting component is located directly above the movable support plate, and the lower end of the pressure block is provided with a second arc-shaped groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By setting up a clamp consisting of a mounting bracket, a first limiting component, and a second limiting component, the clamp can not only hold the camshaft on the shaft holding the camshaft to fix it, but also abut against the inner end of the cam of the camshaft to provide axial support force for the camshaft, thereby further fixing the camshaft. This can prevent the camshaft from slipping when it is subjected to a large axial pressing force when pressing parts onto the camshaft, and ultimately reduce the probability of the camshaft being scratched and scrapped. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the mounting bracket of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the first limiting component of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the second limiting component of this utility model.

[0018] In the diagram: 1. Mounting bracket; 2. First limiting component; 3. Second limiting component; 4. Base plate; 5. L-shaped bracket; 6. Guide rod; 7. Mounting groove; 8. Blind hole; 9. Through hole; 10. Lead screw; 11. Retaining ring; 12. Rotating handle; 13. Moving support plate; 14. Arc-shaped top plate; 15. Threaded hole; 16. First arc-shaped groove; 17. Moving plate; 18. Mounting hole; 19. Cylinder; 20. Pressure plate; 21. Mounting bracket; 22. Pressure block; 23. Second arc-shaped groove. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a camshaft press-fit fixture includes a mounting bracket 1, which consists of a base plate 4, L-shaped brackets 5, and guide rods 6. Two L-shaped brackets 5 are symmetrically and fixedly mounted on the lower end of the base plate 4. The guide rods 6 are fixedly mounted inside the base plate 4. A first limiting assembly 2 is movably mounted on the base plate 4. The first limiting assembly 2 consists of a lead screw 10, a retaining ring 11, a rotating handle 12, a movable support plate 13, and an arc-shaped top plate 14. The retaining ring 11 is fixedly sleeved on the lead screw 10, and the rotating handle 12 is fixedly mounted on one end of the lead screw 10. Two movable support plates 13 are symmetrically mounted on two lead screws 10, and two arc-shaped top plates 14 are respectively fixedly mounted on the outer ends of the two movable support plates 13. A second limiting assembly 3 is slidably mounted on the guide rod 6 and simultaneously fixedly mounted on one end of the movable support plate 13. The second limiting assembly 3 consists of a movable plate 17, a cylinder 19, a pressure plate 20, a mounting bracket 21, and a pressure block 22. The cylinder 19 is fixedly inserted into the movable plate 17, the pressure plate 20 is fixedly installed on the upper end of the telescopic rod of the cylinder 19, the mounting bracket 21 is fixedly installed on the lower end of the pressure plate 20, and the pressure block 22 is fixedly installed on the lower end of the mounting bracket 21. When pressing the part onto the camshaft, the camshaft can be fixed on the fixture first. The method is to first place the shaft part of the camshaft on the movable support plate 13 on the first limiting component 2, and then rotate the screw 10 so that the two movable support plates 13 move away from each other, and finally make the arc-shaped top plate 14 press against the inner end of the cam of the camshaft. At this time, the camshaft will be initially fixed, so that the camshaft cannot move axially. Then, the cylinder 19 on the second limiting component 3 is started. At this time, the telescopic rod of the cylinder 19 will drive the pressure block 22 downward through the pressure plate 20 and the mounting bracket 21, and finally make the pressure block 22 press against the shaft part of the camshaft. At this time, the fixing of the camshaft is completed, and then the part can be pressed onto the camshaft.

[0021] Finally, by setting up a clamp consisting of mounting bracket 1, first limiting component 2 and second limiting component group 3, it can not only clamp and fix the camshaft on the shaft holding the camshaft, but also abut against the inner end of the cam of the camshaft to provide axial support force for the camshaft, thereby further fixing the camshaft. This can prevent the camshaft from slipping when it is subjected to a large axial pressing force when pressing parts onto the camshaft, and ultimately reduce the probability of the camshaft being scratched and scrapped.

[0022] Specifically, a mounting groove 7 is formed on the substrate 4 of the mounting bracket 1, which passes through the substrate 4 vertically. A blind hole 8 is formed on the inner wall of the mounting groove 7. A through hole 9 is formed at one end of the substrate 4, and the through hole 9 communicates with the mounting groove 7. The blind hole 8 and the through hole 9 are coaxial. A guide rod 6 is fixedly installed on the inner wall of the mounting groove 7. A lead screw 10 on the first limiting assembly 2 is rotatably installed in the mounting groove 7, the blind hole 8, and the through hole 9. A retaining ring 11 is located in the mounting groove 7 and simultaneously contacts the inner wall of the mounting groove 7. A rotating handle 12 is located on one side of the substrate 4. A threaded hole 15 is formed on the movable support plate 13 on the first limiting assembly 2. The movable support plate 13 is movably installed on the substrate 4. Inside the mounting groove 7, the movable support plate 13 is simultaneously mounted on the lead screw 10 through the threaded hole 15. The upper end of the movable support plate 13 is provided with a first arc-shaped groove 16. When the camshaft is placed on the first limiting component 2, the shaft of the camshaft can be placed in the first arc-shaped groove 16 at the upper end of the movable support plate 13. When it is necessary to push the arc-shaped top plate 14 against the inner end of the cam of the camshaft, the lead screw 10 can be rotated in the mounting groove 7, the blind hole 8 and the through hole 9 by rotating the handle 12, so that the two movable support plates 13 move in the mounting groove 7, thereby making the two movable support plates 13 move away from each other, until the arc-shaped top plate 14 pushes against the inner end of the cam of the camshaft.

[0023] Specifically, the movable plate 17 on the second limiting component 3 is slidably installed in the mounting groove 7. The movable plate 17 has a mounting hole 18. The movable plate 17 is slidably installed on the guide rod 6 through the mounting hole 18. The movable plate 17 is also fixedly connected to the movable support plate 13. The pressure block 22 on the second limiting component 3 is located directly above the movable support plate 13. The lower end of the pressure block 22 has a second arc-shaped groove 23. When the movable support plate 13 moves, the second limiting component 3 will be driven. At this time, the movable plate 17 will slide on the guide rod 6. When the telescopic rod of the cylinder 19 drives the pressure block 22 downward through the pressure plate 20 and the mounting bracket 21, the pressure block 22 will finally press against the shaft of the camshaft through the second arc-shaped groove 23.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A press-fit fixture for a camshaft, characterized in that: The system includes a mounting bracket (1), which consists of a base plate (4), an L-shaped bracket (5), and a guide rod (6). Two L-shaped brackets (5) are symmetrically fixedly installed on the lower end of the base plate (4). The guide rod (6) is fixedly installed inside the base plate (4). A first limiting assembly (2) is movably installed on the base plate (4). The first limiting assembly (2) consists of a lead screw (10), a retaining ring (11), a rotating handle (12), a movable support plate (13), and an arc-shaped top plate (14). The retaining ring (11) is fixedly sleeved on the lead screw (10). The rotating handle (12) is fixedly installed at one end of the lead screw (10). Two movable support plates (13) are symmetrically installed on the two lead screws (10). On the 0), the arc-shaped top plate (14) has two parts and is fixedly installed on the outer ends of the two movable support plates (13). The guide rod (6) is slidably installed with a second limiting component (3). The second limiting component (3) is also fixedly installed on one end of the movable support plate (13). The second limiting component (3) is composed of a movable plate (17), a cylinder (19), a pressure plate (20), a mounting frame (21), and a pressure block (22). The cylinder (19) is fixedly inserted into the movable plate (17). The pressure plate (20) is fixedly installed on the upper end of the telescopic rod of the cylinder (19). The mounting frame (21) is fixedly installed on the lower end of the pressure plate (20). The pressure block (22) is fixedly installed on the lower end of the mounting frame (21).

2. The press-fit fixture for a camshaft according to claim 1, characterized in that: The mounting bracket (1) has a mounting groove (7) on its base plate (4), which passes through the base plate (4) vertically. The mounting groove (7) has a blind hole (8) on its inner wall. One end of the base plate (4) has a through hole (9) which is connected to the mounting groove (7). The blind hole (8) and the through hole (9) are coaxial. The guide rod (6) is fixedly installed on the inner wall of the mounting groove (7).

3. The press-fit fixture for a camshaft according to claim 2, characterized in that: The lead screw (10) on the first limiting component (2) is rotatably installed in the mounting groove (7), blind hole (8) and through hole (9). The retaining ring (11) is located in the mounting groove (7) and the retaining ring (11) is in contact with the inner wall of the mounting groove (7). The rotating handle (12) is located on one side of the base plate (4).

4. The press-fit fixture for a camshaft according to claim 3, characterized in that: The first limiting component (2) has a threaded hole (15) on its movable support plate (13). The movable support plate (13) is movably installed in the mounting groove (7). The movable support plate (13) is also installed on the lead screw (10) through the threaded hole (15). The upper end of the movable support plate (13) has a first arc groove (16).

5. A press-fit fixture for a camshaft according to claim 4, characterized in that: The movable plate (17) on the second limiting component (3) is slidably installed in the mounting groove (7). The movable plate (17) has a mounting hole (18). The movable plate (17) is slidably installed on the guide rod (6) through the mounting hole (18). The movable plate (17) is also fixedly connected to the movable support plate (13).

6. A press-fit fixture for a camshaft according to claim 5, characterized in that: The pressure block (22) on the second limiting component (3) is located directly above the movable support plate (13), and the lower end of the pressure block (22) is provided with a second arc-shaped groove (23).

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