High-temperature-resistant strong-power camshaft with auxiliary positioning structure

Abstract

This utility model discloses a high-temperature resistant, high-power camshaft with an auxiliary positioning structure, including a shaft body, a cam, a transmission gear, and an auxiliary positioning mechanism. The cam is fixedly connected to the shaft body, and a mounting part is provided at the end of the shaft body away from the cam. The top of the mounting part has a keyway, and a wedge-shaped key for fixing the transmission gear is provided in the keyway. A gap is reserved between the wedge-shaped key and the keyway in the rotation direction of the transmission gear. The top of the wedge-shaped key has a rectangular positioning groove. The auxiliary positioning mechanism is set on the mounting part and has a cylindrical positioning pin that can rotate and move up and down. After the positioning pin is rotated to adjust its direction, it can be inserted into the positioning groove. After the positioning pin is inserted into the positioning groove, it is locked by a locking mechanism to restrict its rotation. After calibration, the transmission gear of this utility model is further initially fixed by the auxiliary positioning mechanism to ensure that the position does not shift during the rotation and tightening of the nut, thus ensuring the accuracy of the product.

Description

Technical Field

[0001] This utility model relates to the field of engine parts technology, specifically to a high-temperature resistant, high-power camshaft with an auxiliary positioning structure. Background Technology

[0002] The camshaft is a component in a piston engine used to control the opening and closing of valves. Because the camshaft rotates at relatively high speeds, it needs to withstand significant torque. Therefore, during the machining of the camshaft, the cam and shaft body are typically... The camshaft is securely fixed or integrated to ensure its strength.

[0003] A camshaft includes a shaft body, a cam, and a transmission gear. Both the cam and the transmission gear are fixedly connected to the shaft body, and there is a certain positioning relationship between the cam's orientation and the transmission gear's tooth direction. This necessitates positioning of the transmission gear and shaft body during installation. CN203730082U discloses a wheel and axle and camshaft drive mechanism. This technical solution uses bolts to tighten a key into a wedge-shaped keyway to fix the shaft and synchronous pulley, and reserves a gap between the key and the keyway to ensure that the fixed pulley can rotate relative to the shaft during installation, thereby adjusting the installation direction. However, this structure has a drawback: after the fixed pulley is adjusted relative to the shaft, there is no initial fixing device. This can lead to relative misalignment during the tightening of the rotating bolts, resulting in product defects. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a high-temperature resistant, high-power camshaft with an auxiliary positioning structure.

[0005] Technical solution

[0006] A high-temperature resistant, high-power camshaft with an auxiliary positioning structure includes a shaft body, a cam, a transmission gear, and an auxiliary positioning mechanism. The cam is fixedly connected to the shaft body. The end of the shaft body away from the cam has a mounting part. The top of the mounting part has a keyway, and a wedge-shaped key for fixing the transmission gear is provided in the keyway. A gap is reserved between the wedge-shaped key and the keyway in the rotation direction of the transmission gear. The top of the wedge-shaped key has a rectangular positioning groove. The auxiliary positioning mechanism is set on the mounting part. The auxiliary positioning mechanism has a cylindrical positioning pin that can rotate and move up and down. After the positioning pin is rotated to adjust its direction, it can be inserted into the positioning groove. After the positioning pin is inserted into the positioning groove, it is locked by a locking mechanism to restrict its rotation.

[0007] Furthermore, the auxiliary positioning mechanism includes a fixed base, the bottom of which is provided with a locking block that is locked in a slot at the top of the mounting part. A rotating shaft is rotatably connected to the top of the fixed base, and a lifting block is slidably connected to the rotating shaft. A positioning pin is fixed to the lifting block, and the lifting block is connected to a lifting adjustment mechanism.

[0008] Furthermore, the locking mechanism includes a stop plate and a stop block. The stop plate is fixed to the top of the fixed base, and the top of the stop block is fixedly connected to the lifting block via a connecting rod. The connecting rod passes through a guide hole on the fixed plate, and the fixed plate is fixed on the rotating shaft. A spring is provided on the connecting rod between the fixed plate and the stop block.

[0009] Furthermore, the lifting adjustment mechanism includes a pressure rod hinged to the top of the rotating shaft, the pressure rod being hinged to a connecting plate, and the connecting plate being hinged to the top of the lifting block.

[0010] Furthermore, the end of the mounting part is provided with a stud, which passes through the center hole of the transmission gear and is threaded to a nut, which presses against the wedge key.

[0011] Furthermore, the transmission gear is provided with a positioning hole, and a wedge key is disposed in the positioning hole.

[0012] Beneficial effects:

[0013] This utility model provides a high-temperature resistant, high-power camshaft with an auxiliary positioning structure. The transmission gear and shaft are installed by wedge key and keyway. The keyway and wedge key have a gap in the rotation direction of the transmission gear. Rotating the transmission gear can adjust its installation direction to complete the calibration. After calibration, it is further initially fixed by the auxiliary positioning mechanism to ensure that the position will not shift during the rotation and tightening of the nut, thus ensuring the accuracy of the product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the camshaft structure of this utility model; Figure 2 This is a schematic diagram of the integrally formed structure of the shaft, mounting part and stud of this utility model; Figure 3 This is a schematic diagram of the auxiliary positioning mechanism of this utility model; Figure 4 This is a side view of the transmission gear of this utility model; Figure 5 This is a schematic diagram of the structure of the stop disc of this utility model.

[0015] In the diagram, 1. Shaft, 2. Cam, 3. Transmission gear, 4. Mounting part, 5. Keyway, 6. Wedge key, 7. Positioning groove, 8. Positioning pin, 9. Fixed seat, 10. Locking block, 11. Locking groove, 12. Rotating shaft, 13. Lifting block, 14. Stop plate, 15. Stopping block, 16. Connecting rod, 17. Fixed plate, 18. Spring, 19. Pressure rod, 20. Connecting plate, 21. Stud. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings.

[0017] As attached Figure 1 To be continued Figure 5 . Specific implementation examples:

[0019] A high-temperature resistant, high-power camshaft with an auxiliary positioning structure is made of high-temperature resistant and high-strength metal material. It includes a shaft body 1, a cam 2, a transmission gear 3, and an auxiliary positioning mechanism. The cam 2 is fixedly connected to the shaft body 1. A mounting part 4 is provided at the end of the shaft body 1 away from the cam 2. A keyway 5 is provided on the top of the mounting part 4. A wedge-shaped key 6 for fixing the transmission gear 3 is provided in the keyway 5. A gap is reserved between the wedge-shaped key 6 and the keyway 5 in the rotation direction of the transmission gear 3. This gap is designed to allow the transmission gear 3 to rotate a certain angle relative to the shaft body 1, thereby allowing the direction of the transmission gear 3 to be adjusted before fixing. The top of the wedge-shaped key 6 is provided with... The rectangular positioning groove 7 has an auxiliary positioning mechanism on the mounting part 4. The auxiliary positioning mechanism has a cylindrical positioning pin 8 that can rotate and move up and down. The purpose of rotation is to adjust the positioning pin 8 and the positioning groove 7 so that the positioning pin 8 can be inserted into the positioning groove 7. The purpose of moving up and down is to control the engagement and disengagement of the positioning pin 8 and the positioning groove 7. After the positioning pin 8 is adjusted by rotation, it can be inserted into the positioning groove 7. After the positioning pin 8 is inserted into the positioning groove 7, it is locked by a locking mechanism to restrict its rotation. The purpose of setting the locking mechanism is to prevent the positioning pin 8 from rotating when the transmission gear 3 rotates relative to the shaft 1, which would cause the positioning pin 8 to lose its effect.

[0020] The auxiliary positioning mechanism includes a fixed base 9, with a locking block 10 at the bottom of the fixed base 9. The locking block 10 is engaged in a slot 11 at the top of the mounting part 4. The engagement of the locking block 10 and the slot 11 is separable. After the transmission gear 3 is installed, the entire auxiliary positioning mechanism can be removed and reused. A rotating shaft 12 is rotatably connected to the top of the fixed base 9, and a lifting block 13 is slidably connected to the rotating shaft 12. A positioning pin 8 is fixed to the lifting block 13, and the lifting block 13 is connected to a lifting adjustment mechanism.

[0021] The locking mechanism includes a stop disc 14 and a stop block 15. The stop disc 14 is fixed to the top of the fixed base 9. The top of the stop block 15 is fixedly connected to the lifting block 13 via a connecting rod 16. The connecting rod 16 passes through a guide hole on the fixed plate 17. The fixed plate 17 is fixed to the rotating shaft 12. A spring 18 is provided on the connecting rod 16 between the fixed plate 17 and the stop block 15. Preferably, the stop disc 14 is a disc structure with evenly distributed toothed grooves on the top. The stop block 15 is fan-shaped with locking teeth on the bottom. The locking teeth and toothed grooves, when engaged, can restrict the rotation of the rotating shaft 12.

[0022] The lifting and adjusting mechanism includes a pressure rod 19 hinged to the top of the rotating shaft 12, the pressure rod 19 being hinged to a connecting plate 20, and the connecting plate 20 being hinged to the top of the lifting block 13. The pressure rod 19 adopts a lever-based force-saving structure.

[0023] The end of the mounting part 4 is provided with a stud 21. The stud 21 passes through the center hole of the transmission gear 3 and is threaded to a nut 22. The nut 22 presses against the wedge key 6.

[0024] The transmission gear 3 is provided with a positioning hole, and the wedge key 6 is set in the positioning hole.

[0025] The working principle of this utility model is as follows: When installing the transmission gear 3, first put the transmission gear 3 on the mounting part 4, insert the wedge key 6 into the keyway 5 through the positioning hole, rotate the transmission gear 3 to calibrate the position, press the pressure rod 19, the pressure rod 19 pulls the lifting block 13 upward through the connecting plate 20, and while the lifting block 13 moves upward, it will drive the stop block 15 away from the stop plate 14 through the connecting rod 16, and the rotating shaft 12 can rotate freely. By rotating the rotating shaft 12, the positioning pin 8 is moved above the positioning groove 7. Release the pressure rod 19, and the positioning pin 8 falls and inserts into the positioning groove 7. At this time, the stop block 15 and the stop plate 14 are in contact, and the rotating shaft 12 can no longer rotate. The positioning pin 8 restricts the circumferential position of the wedge key 6 in the keyway 5, so as to ensure that the nut 22 will not shift or change the gap size during the tightening process, and ensure the installation accuracy of the transmission gear 3 and the shaft 1.

[0026] Although the present invention has been disclosed above with reference to preferred embodiments, these are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection of the claims of this application.

Claims

1. A high-temperature resistant, high-power camshaft with an auxiliary positioning structure, characterized in that, The device includes a shaft, a cam, a transmission gear, and an auxiliary positioning mechanism. The cam is fixedly connected to the shaft. The end of the shaft away from the cam has a mounting part. The top of the mounting part has a keyway. A wedge-shaped key for fixing the transmission gear is provided in the keyway. A gap is reserved between the wedge-shaped key and the keyway in the rotation direction of the transmission gear. The top of the wedge-shaped key has a rectangular positioning groove. The auxiliary positioning mechanism is set on the mounting part. The auxiliary positioning mechanism has a cylindrical positioning pin that can rotate and move up and down. After the positioning pin is rotated to adjust its direction, it can be inserted into the positioning groove. After the positioning pin is inserted into the positioning groove, it is locked by a locking mechanism to restrict its rotation.

2. The high-temperature resistant, high-power camshaft with an auxiliary positioning structure according to claim 1, characterized in that, The auxiliary positioning mechanism includes a fixed base, the bottom of which is provided with a locking block that is locked in a slot at the top of the mounting part. The top of the fixed base is rotatably connected to a rotating shaft, and a lifting block is slidably connected to the rotating shaft. A positioning pin is fixed to the lifting block, and the lifting block is connected to a lifting adjustment mechanism.

3. A high-temperature resistant, high-power camshaft with an auxiliary positioning structure according to claim 2, characterized in that, The locking mechanism includes a stop plate and a stop block. The stop plate is fixed to the top of the fixed base. The top of the stop block is fixedly connected to the lifting block through a connecting rod. The connecting rod passes through the guide hole on the fixed plate. The fixed plate is fixed on the rotating shaft. A spring is provided on the connecting rod between the fixed plate and the stop block.

4. A high-temperature resistant, high-power camshaft with an auxiliary positioning structure according to claim 2 or 3, characterized in that, The lifting and adjusting mechanism includes a pressure rod hinged to the top of the rotating shaft, the pressure rod being hinged to a connecting plate, and the connecting plate being hinged to the top of the lifting block.

5. A high-temperature resistant, high-power camshaft with an auxiliary positioning structure according to claim 1, characterized in that, The end of the mounting part is provided with a stud, which passes through the center hole of the transmission gear and is threaded to a nut, which presses the wedge key.

6. A high-temperature resistant, high-power camshaft with an auxiliary positioning structure according to claim 1 or 5, characterized in that, The transmission gear is provided with a positioning hole, and a wedge key is set in the positioning hole.

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