Crankshaft pulley mounting aid

Abstract

The utility model discloses a kind of auxiliary fixtures of crankshaft pulley installation, belong to fixture technical field, including plugging resistance block, the lower portion of plugging resistance block is provided with positioning suction cup, the side of plugging resistance block is provided with anti-deviation guide mechanism, anti-deviation guide mechanism includes first support arm, second support arm and pulley center column, first support arm and second support arm are slidably connected in the side of plugging resistance block, second support arm is set in the side of first support arm, pulley center column is set in the lower portion of first support arm and second support arm;The utility model is cooperated with positioning suction cup by plugging resistance block, plugging resistance block and crankshaft keyway wall body cooperate to exert the force of pressing against flat key, change the unstable state that traditional flat key only relies on itself and keyway gap cooperation, in pulley push-in process, the impact of axial thrust to flat key can be effectively counteracted, avoid flat key sliding or falling off to engine interior, guarantee installation reliability.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, specifically to an auxiliary clamp for installing crankshaft pulleys. Background Technology

[0002] In the field of modern engine manufacturing and maintenance, the crankshaft pulley is a key component for power transmission. Its installation quality directly affects the stability and reliability of engine power transmission. The crankshaft pulley is usually circumferentially positioned and connected to the crankshaft through a flat key. During the installation process, the pulley needs to be pushed smoothly along the crankshaft axis so that the flat key is accurately embedded in the pulley keyway to complete the assembly of the power transmission structure.

[0003] Currently, the mating method between the flat key and the crankshaft keyway is usually a clearance fit. During the push-in process of the pulley, the axial thrust acts directly on the flat key, which can easily cause the flat key to slide into the engine or even fall off, resulting in installation failure. When the pulley keyway and flat key are initially connected, due to the lack of an effective guiding structure, their edges are prone to hard collision, causing jamming. This not only increases the installation difficulty and prolongs the assembly time, but may also cause damage to the edges of the flat key and keyway, reducing the connection strength and assembly accuracy. In addition, the existing installation method cannot effectively constrain the axial movement of the pulley. During the push-in process, the pulley is prone to displacement, causing the flat key to bear uneven lateral forces, further aggravating the risk of flat key displacement. This makes it difficult to guarantee the reliability and stability of the crankshaft pulley installation. Therefore, an auxiliary fixture for crankshaft pulley installation is needed to solve the problems existing in the current technology. Utility Model Content

[0004] The purpose of this utility model is to provide an auxiliary clamp for installing crankshaft pulleys to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a crankshaft pulley installation auxiliary clamp, comprising a sealing block, a positioning suction cup disposed below the sealing block, and an anti-deviation guiding mechanism disposed on one side of the sealing block. The anti-deviation guiding mechanism comprises a first support arm, a second support arm, and a pulley center column. The first support arm and the second support arm are slidably connected to one side of the sealing block, the second support arm is disposed on one side of the first support arm, and the pulley center column is disposed below the first support arm and the second support arm.

[0006] Preferably, one end of both the first support arm and the second support arm is fixed with an adjustment guide block, and a reset spring is fixed between the two adjustment guide blocks.

[0007] Preferably, an adjusting guide rod is fixed in the inner cavity of the blocking block, the adjusting guide block is slidably connected to the outside of the adjusting guide rod, the reset spring is sleeved on the outside of the adjusting guide rod, and the surface of the adjusting guide block is provided with an adjusting guide hole that slides and matches the adjusting guide rod.

[0008] Preferably, a connecting frame is fixed to the lower end of the sealing block, and one end of the connecting frame is fixed to the center of one end face of the pulley central column.

[0009] Preferably, the ends of the first support arm and the second support arm away from the blocking block are provided with shrinkable insertion ends, and the width of the shrinkable insertion ends is smaller than the keyway width of the pulley.

[0010] Preferably, the tail end of the positioning suction cup is fixed to one end of the connecting frame, and the inside of the positioning suction cup is provided with an adsorption port.

[0011] This utility model provides an auxiliary clamp for installing crankshaft pulleys, which has the following advantages compared with the prior art:

[0012] By cooperating with the sealing block and the positioning suction cup, the sealing block and the crankshaft keyway wall work together to apply a clamping force to the flat key, changing the unstable state of the traditional flat key that only relies on the gap between itself and the keyway. During the process of the pulley pushing in, it can effectively offset the impact of the axial thrust on the flat key, prevent the flat key from sliding into the engine or falling off, and ensure the reliability of installation.

[0013] With the anti-deviation guiding mechanism, the retractable insertion ends of the first and second support arms adopt a narrow-mouth design, which significantly reduces the initial insertion resistance of the pulley keyway and effectively avoids the jamming problem caused by the hard collision between the keyway edge and the flat key in traditional processes, making the installation process smoother and more efficient. The self-adaptive expansion of the first and second support arms by the return spring allows them to act evenly on both sides of the keyway. Together with the pulley center column that is consistent with the crankshaft, it ensures that the pulley maintains axial linear movement during the push-in process. In addition, the first and second support arms are positioned in front to receive the thrust of the keyway, so that the flat key only contacts the pulley keyway at the end of the assembly. This is equivalent to setting up a "buffer isolation zone" in front of the flat key, avoiding the impact force at the beginning of the assembly from acting directly on the flat key, further reducing the risk of flat key displacement and extending the service life of the flat key. Attached Figure Description

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

[0015] Figure 2 This is a three-dimensional cross-sectional view of the sealing block structure of this utility model;

[0016] Figure 3 This is a perspective view of the first support arm structure of this utility model;

[0017] Figure 4 This is a three-dimensional view of the positioning suction cup structure of this utility model.

[0018] In the diagram: 1. Sealing block; 2. Connecting frame; 3. Positioning suction cup; 4. Anti-deviation guide mechanism; 5. First support arm; 6. Second support arm; 7. Retractable insertion end; 8. Adjustment guide block; 9. Adjustment guide rod; 10. Return spring; 11. Pulley center column; 12. Adjustment guide hole; 13. Suction port. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides an auxiliary fixture for installing a crankshaft pulley, including a sealing block 1. An anti-deviation guiding mechanism 4 is provided on one side of the sealing block 1. The anti-deviation guiding mechanism 4 includes a first support arm 5, a second support arm 6, and a pulley center column 11. The first support arm 5 and the second support arm 6 are slidably connected to one side of the sealing block 1. A retractable insertion end 7 is provided at the end of the first support arm 5 and the second support arm 6 away from the sealing block 1. The width of the retractable insertion end 7 is smaller than the keyway width of the pulley. Because the width of the retractable insertion end 7 is smaller than the keyway width, the initial insertion resistance is reduced, avoiding jamming caused by hard collision between the keyway and the flat key. Under the action of the return spring 10, it adaptively matches the keyway width, evenly abutting against the two side walls of the keyway, guiding the pulley to advance linearly along the axial direction, preventing deviation. It can also pre-load the thrust of the pulley, ensuring that the flat key only contacts the keyway at the end of assembly, forming a "buffer isolation zone" and reducing the initial stress risk on the flat key.

[0021] Further as Figure 1 , Figure 2 and Figure 3 As shown, it is worth noting that the second support arm 6 is located on one side of the first support arm 5, and the pulley center column 11 is located below the first support arm 5 and the second support arm 6. One end of the first support arm 5 and the second support arm 6 are fixed with an adjustment guide block 8, and a return spring 10 is fixed between the two adjustment guide blocks 8. The return spring 10 provides a rebound force to push the support arm outward and closely fit the side wall of the keyway, ensuring the centering during the pulley's advancement process. It can also absorb some of the impact force during the assembly process and reduce the rigid collision between the support arm and the keyway.

[0022] Further as Figure 3 As shown, it is worth noting that an adjusting guide rod 9 is fixed in the inner cavity of the sealing block 1, the adjusting guide block 8 is slidably connected to the outside of the adjusting guide rod 9, the reset spring 10 is sleeved on the outside of the adjusting guide rod 9, the surface of the adjusting guide block 8 is provided with an adjusting guide hole 12 that slides and matches the adjusting guide rod 9, the lower end of the sealing block 1 is fixed with a connecting frame 2, and one end of the connecting frame 2 is fixed at the center of one end face of the pulley center column 11.

[0023] Further as Figure 1 , Figure 2 and Figure 4 As shown, it is worth noting that a positioning suction cup 3 is provided below the sealing block 1. The positioning suction cup 3 is adsorbed onto the crankshaft end face through the internal adsorption port 13, which helps the sealing block 1 fix the position of the clamp and enhances the overall positioning accuracy. After assembly, the positioning suction cup 3 can be removed when the pulley center column 11 is pulled out, so as to realize the quick removal of the clamp. The tail end of the positioning suction cup 3 is fixed to one end of the connecting frame 2. The positioning suction cup 3 is provided with an adsorption port 13 inside. The sealing block 1 slides into the crankshaft keyway and locks the position of the flat key by physical compression with the keyway wall, preventing the flat key from sliding or falling off due to axial thrust impact during the assembly of the pulley.

[0024] This solution has the following working process: Before use, the flat key is installed into the keyway of the crankshaft, and then the sealing block 1 slides into the keyway. At this time, the suction port 13 of the positioning suction cup 3 is attached to the end face of the crankshaft. In this way, the sealing block 1 entering the keyway, together with the keyway wall, physically squeezes and locks the flat key. This design changes the unstable state of the traditional "only relying on the gap between the flat key and the keyway". Especially during the process of pushing the pulley in, it can offset the impact of axial thrust on the flat key and prevent the flat key from sliding into the engine or falling off. After the pulley is assembled on the crankshaft, the purpose of conveniently removing the clamp structure can be achieved by pulling the pulley center column 11 away from the positioning suction cup 3.

[0025] When the pulley is assembled onto the crankshaft, the keyway of the pulley is aligned with the retractable insertion end 7 at one end of the first support arm 5 and the second support arm 6. Since the retractable insertion end 7 at the front end of the first support arm 5 and the second support arm 6 has a small width, and the first support arm 5 and the second support arm 6 are consistent with the width of the keyway under the adaptive expansion of the return spring 10, when the pulley keyway is aligned with the retractable insertion end 7 and pushed forward, the narrow structure can greatly reduce the initial insertion resistance and avoid the problem of "hard collision between the edge of the keyway and the flat key causing jamming" in the traditional process. The rebound force of the return spring 10 adaptively expands the first support arm 5 and the second support arm 6 and acts evenly on both sides of the keyway. With the pulley center column 11 consistent with the crankshaft, the pulley maintains axial linear motion during the pushing process. By the first support arm 5 and the second support arm 6 bearing the thrust of the keyway in front, the flat key only contacts the pulley keyway at the end of the assembly. This is equivalent to setting a "buffer isolation zone" in front of the flat key, avoiding the impact force at the beginning of the assembly from acting directly on the flat key, and further reducing the risk of flat key displacement.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Although embodiments of this utility model have been shown and described, this does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model. Regarding the embodiments of this utility model, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A crankshaft pulley installation auxiliary clamp, comprising a sealing block (1), characterized in that: A positioning suction cup (3) is provided below the sealing block (1), and an anti-deviation guide mechanism (4) is provided on one side of the sealing block (1). The anti-deviation guide mechanism (4) includes a first support arm (5), a second support arm (6) and a pulley center column (11). The first support arm (5) and the second support arm (6) are slidably connected to one side of the sealing block (1). The second support arm (6) is located on one side of the first support arm (5), and the pulley center column (11) is located below the first support arm (5) and the second support arm (6).

2. The crankshaft pulley mounting auxiliary fixture according to claim 1, characterized in that: One end of the first support arm (5) and the second support arm (6) is fixed with an adjustment guide block (8), and a reset spring (10) is fixed between the two adjustment guide blocks (8).

3. The crankshaft pulley installation auxiliary fixture according to claim 2, characterized in that: An adjusting guide rod (9) is fixed in the inner cavity of the sealing block (1). The adjusting guide block (8) is slidably connected to the outside of the adjusting guide rod (9). The reset spring (10) is sleeved on the outside of the adjusting guide rod (9). The surface of the adjusting guide block (8) is provided with an adjusting guide hole (12) that slides and matches the adjusting guide rod (9).

4. The crankshaft pulley installation auxiliary fixture according to claim 1, characterized in that: The lower end of the sealing block (1) is fixed with a connecting frame (2), and one end of the connecting frame (2) is fixed at the center of one end face of the pulley center column (11).

5. The crankshaft pulley mounting auxiliary fixture according to claim 3, characterized in that: The first support arm (5) and the second support arm (6) are provided with a shrinkage insertion end (7) at the end away from the sealing block (1), and the width of the shrinkage insertion end (7) is smaller than the keyway width of the pulley.

6. The crankshaft pulley installation auxiliary fixture according to claim 1, characterized in that: The tail end of the positioning suction cup (3) is fixed to one end of the connecting frame (2), and the inside of the positioning suction cup (3) is provided with an adsorption port (13).

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