An automatic pressing device for camshaft sprockets

Abstract

This invention provides an automatic camshaft sprocket pressing device. Its second positioning module includes a movable frame, a sprocket positioning shaft, and a keyway positioning assembly. After the sprocket is fitted onto the sprocket positioning shaft, it rotates with the shaft. When the keyway of the sprocket rotates to the position of the positioning rod of the keyway positioning assembly, the positioning rod extends from the movable frame and embeds into the keyway of the sprocket, thereby locking the keyway of the sprocket in the position of the positioning rod. The fixed position of the positioning rod allows for precise alignment with the positioning pin on the pre-positioned camshaft. As the movable frame moves towards the first positioning module, the sprocket can be accurately pressed onto the camshaft body. The automatic camshaft sprocket pressing device provided by this invention achieves automatic positioning of the sprocket keyway by rotating the sprocket positioning shaft, eliminating the need for high-cost CNC equipment and effectively reducing the automation cost of camshaft sprocket pressing, thus lowering production costs.

Description

Technical Field

[0001] This invention relates to the field of mechanical automation production technology, and in particular to an automatic pressing device for camshaft sprockets. Background Technology

[0002] The camshaft is the core component of the engine valve train, responsible for controlling the opening and closing of the valves. Its end is usually press-fitted with a signal wheel and a sprocket (generally referred to as the wheel body). The signal wheel is used to work with the camshaft position sensor to obtain the phase positioning of each cam on the camshaft, so that the engine control system can identify the position and status of the cylinder. The sprocket is used for power transmission of the camshaft.

[0003] The assembly of the sprocket body to the camshaft body is mainly achieved by interference fit between the inner hole of the sprocket body and the shaft body. In order to ensure the reliability of the transmission between the sprocket and the camshaft, a keyway is also provided on the inner hole of the sprocket. The keyway cooperates with the locating pin on the camshaft to ensure the reliability of torque transmission.

[0004] In sprocket assembly, the keyway on the sprocket's inner bore has a clearance fit with the locating pin mounted on the camshaft body. The locating pin is press-fitted onto the shaft body before the sprocket is installed. During the locating pin press-fit process, the camshaft body is already positioned. After being transferred to the sprocket press-fitting equipment using a high-precision transfer device, only the sprocket needs to be positioned. However, the sprocket's orientation is not fixed. After being transferred to the sprocket press-fitting equipment, it still needs to be aligned. To improve assembly reliability, the sprocket needs to be heated before press-fitting. For disc-shaped, high-temperature sprockets, manual operation is difficult. Automated CNC equipment is often used for automated alignment, which offers high precision. However, existing automated CNC equipment is expensive and complex to maintain, increasing production costs. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an automatic pressing device for camshaft sprockets, so as to solve the problem that the existing automatic pressing schemes rely on automated CNC equipment, which is costly and complex to maintain, thus increasing production costs.

[0006] This invention provides an automatic pressing device for camshaft sprockets, comprising: a machine base, and a first positioning module and a second positioning module disposed opposite to each other on the machine base along the longitudinal direction of the machine base, wherein...

[0007] The first positioning module is used to fix the pre-positioned camshaft body, so as to fix the camshaft body along the longitudinal direction of the machine tool and position the positioning pin on the camshaft body at the predetermined position.

[0008] The second positioning module is used for positioning the sprocket to align and match the keyway of the sprocket with the positioning pin. The second positioning module includes a movable frame, a sprocket positioning shaft, and a keyway positioning assembly.

[0009] The movable frame is slidably mounted on the machine platform along the longitudinal direction of the machine platform and is connected to the press-fitting power source for pressing the sprocket onto the camshaft body via the movable frame;

[0010] The sprocket positioning shaft is rotatably disposed in the movable frame and is coaxially aligned with the camshaft shaft positioned on the first positioning module. An expansion clamp is provided in the sprocket positioning shaft to fix the sprocket on the sprocket positioning shaft so that the sprocket can rotate with the sprocket positioning shaft.

[0011] The sprocket positioning shaft is also slidably connected to the movable frame along the axial direction, so that after the sprocket positioning shaft contacts the corresponding camshaft body, the movable frame can continue to move to push and press the sprocket on the sprocket positioning shaft onto the corresponding camshaft body.

[0012] The keyway positioning assembly includes a positioning rod, which is elastically mounted on the movable frame along the longitudinal direction of the machine tool. When the keyway of the sprocket rotates to the position of the positioning rod as the sprocket follows the sprocket positioning shaft, the positioning rod can pop out and embed into the keyway of the sprocket, thereby positioning the keyway of the sprocket at the position of the positioning rod.

[0013] Optionally, the second positioning module further includes the sprocket locking assembly, which includes a movable block and a guide plate, wherein...

[0014] The movable block is vertically and movably mounted at the bottom of the movable frame, the top of the movable block points to the sprocket mounting position of the sprocket positioning shaft, and a friction pad is provided on the top of the movable block;

[0015] The guide plate is arranged along the ejection path of the movable frame, and two plates are arranged at intervals therebetween. A first guide groove is provided on the inner side of the guide plate. The bottom of the movable block extends laterally into the first guide groove and is arranged therein. When the movable block moves with the movable frame toward the first positioning module, it can lift and press the movable block against the sprocket positioned on the sprocket positioning shaft.

[0016] Optionally, the first guide groove includes a first guide groove and a second guide groove arranged sequentially along the direction pointing to the first positioning module. The first guide groove is a horizontal single groove structure and is located at the bottom.

[0017] A dividing strip is provided in the middle of the second guide groove to divide the second guide groove into upper and lower grooves. A stop bar is provided at the end of the dividing strip away from the first positioning module. The stop bar is connected to the guide plate through a torsion spring. The upper and lower grooves are connected at the end closer to the first positioning module.

[0018] After the sprocket is pressed into the camshaft body, the movable block can be moved from the end of the upper and lower grooves to the lower groove, thereby releasing the lock on the sprocket.

[0019] Optionally, the expansion clamp includes at least one contact block disposed around the sprocket positioning shaft, the contact block being radially disposed in the sprocket positioning shaft and elastically connected to the sprocket positioning shaft via a first spring.

[0020] Optionally, a fixed frame is also fixedly installed on the machine base, and the fixed frame extends into the movable frame;

[0021] The sprocket positioning shaft has a hollow structure, and a guide frame is also provided inside the sprocket positioning shaft. The guide frame is fixedly connected to the fixed frame. A second guide groove is provided in the guide frame. A guide section and a positioning section are provided in the second guide groove outward along the axial direction of the sprocket positioning shaft. The guide section is inclined outward, and the positioning section is parallel to the axial direction of the sprocket positioning shaft.

[0022] The contact block also extends laterally into the corresponding second guide groove.

[0023] Optionally, the movable frame is provided with a chassis that fits and matches the wheel surface of the sprocket. The chassis is provided with a first opening structure, and the positioning rod is disposed in the first opening structure and is elastically connected to the chassis by a second spring.

[0024] Optionally, the outer end of the positioning rod is provided with a ball bearing.

[0025] Optionally, a fixed frame is also fixedly installed on the machine base, and the fixed frame extends into the movable frame;

[0026] The chassis is also provided with a second opening structure, which is connected to the first opening structure.

[0027] The keyway positioning assembly further includes a first limiting member and a second limiting member. The first limiting member is disposed in the second opening structure and fixed to the fixing frame. The second limiting member is elastically disposed in the communication area between the second opening structure and the first opening structure.

[0028] As the movable frame moves toward the first positioning module, the first limiting member can gradually withdraw from the second opening structure, thereby releasing the restriction on the second limiting member. This allows the second limiting member to shift from the first opening structure to the second opening structure, thereby releasing the restriction on the positioning rod. The positioning rod can then extend from the first opening structure and embed itself in the keyway of the sprocket.

[0029] Optionally, the first positioning module includes a plurality of mechanical clamps and support blocks arranged at longitudinal intervals along the machine tool, the support blocks being arranged in a direction away from the second positioning module.

[0030] Optionally, a third spring is provided between the sprocket positioning shaft and the movable frame, so that after the sprocket is pressed onto the corresponding camshaft body and the movable frame is retracted, the sprocket positioning shaft can extend out of the movable frame and reset, so that the expansion clamp is exposed to the outside.

[0031] The automatic camshaft sprocket pressing device provided by this invention has a first positioning module and a second positioning module arranged opposite each other on the machine base, respectively used for positioning the camshaft shaft and the sprocket. The second positioning module includes a movable frame, a sprocket positioning shaft, and a keyway positioning assembly. After the sprocket is fitted onto the sprocket positioning shaft, it can rotate with the sprocket positioning shaft. When the keyway of the sprocket rotates to the positioning rod position of the keyway positioning assembly, the positioning rod can extend from the movable frame and embed into the keyway of the sprocket, thereby locking the keyway of the sprocket in the position of the positioning rod. The fixed position of the positioning rod can be precisely aligned with the positioning pin on the pre-positioned camshaft. As the movable frame moves towards the first positioning module, the sprocket can be accurately pressed onto the camshaft shaft. The automatic camshaft sprocket pressing device provided by this invention can achieve automatic positioning of the sprocket keyway by rotating the sprocket positioning shaft, eliminating the need for high-cost CNC equipment and effectively reducing the automation cost of camshaft sprocket pressing and production costs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the automatic camshaft sprocket pressing device in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the main module structure of the automatic pressing device for camshaft sprockets in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the external structure of the second positioning module of the automatic pressing device for camshaft sprockets in an embodiment of the present invention;

[0035] Figure 4 This is a cross-sectional view of the second positioning module of the automatic pressing device for camshaft sprockets in an embodiment of the present invention.

[0036] Figure 5 for Figure 4 A magnified schematic diagram of a portion of region A in the middle;

[0037] Figure 6 This is a schematic diagram of the keyway positioning assembly of the automatic press-fitting device for camshaft sprockets in an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the relevant structure of the sprocket positioning shaft of the automatic pressing device for camshaft sprockets in an embodiment of the present invention;

[0039] Figure 8 for Figure 7 A magnified schematic diagram of a portion of region B in the middle;

[0040] Figure 9 This is a schematic diagram of the sprocket locking assembly of the camshaft sprocket automatic pressing device in an embodiment of the present invention.

[0041] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0042] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0043] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] To address the issue that existing automated press-fitting solutions rely on automated CNC equipment, which is costly and complex to maintain, increasing production costs, this invention provides an automatic press-fitting device for camshaft sprockets. The device comprises a first positioning module and a second positioning module arranged opposite each other on a machine base, used for positioning the camshaft shaft and sprocket respectively. The second positioning module includes a movable frame, a sprocket positioning shaft, and a keyway positioning assembly. After the sprocket is fitted onto the sprocket positioning shaft, it rotates with the shaft. When the keyway of the sprocket rotates to the positioning rod position of the keyway positioning assembly, the positioning rod extends from the movable frame and embeds into the keyway of the sprocket, locking the keyway in the positioning rod position. The fixed position of the positioning rod allows for precise alignment with a pre-positioned positioning pin on the camshaft. As the movable frame moves towards the first positioning module, the sprocket is accurately press-fitted onto the camshaft shaft. By rotating the sprocket positioning shaft, automatic positioning of the sprocket keyway is achieved, eliminating the need for costly CNC equipment and effectively reducing the automation cost of camshaft sprocket press-fitting, thus lowering production costs.

[0046] Specifically, such as Figure 1 and Figure 2 As shown, a first positioning module 30 and a second positioning module 20 are arranged opposite each other along the longitudinal direction on the machine base 10. The first positioning module 30 is used to fix the pre-positioned camshaft shaft 101 to fix the camshaft shaft 101 along the longitudinal direction of the machine base 10 and to position the positioning pin on the camshaft shaft 10 at a predetermined position. The second positioning module 20 is used to position the sprocket 102 to align and match the keyway of the sprocket 102 with the positioning pin.

[0047] The first positioning module 30 includes a plurality of mechanical clamps 31 and support blocks 32 arranged longitudinally along the machine base 10. The support blocks 32 are arranged in a direction away from the second positioning module 20. The camshaft body 101 can be axially positioned and fixed by the plurality of mechanical clamps 31. The support blocks 32 are supported at the rear end of the camshaft body 101 and can be used to hold the camshaft body 101 in the press-fitting process to ensure the reliability of the press-fitting force.

[0048] Please refer to further details. Figure 3 As shown, the second positioning module 20 includes a movable frame 210, in which a sprocket positioning shaft 220 is provided. The sprocket positioning shaft 220 is coaxially aligned with the camshaft body 101, and the sprocket 102 is coaxially mounted on the sprocket positioning shaft 220. The coaxial alignment between the sprocket positioning shaft 220 and the camshaft body 101 can be achieved to ensure the coaxiality of the press-fitting.

[0049] The movable frame 210 is movably mounted on the machine base 10 along the longitudinal direction of the machine base 10 via the guide rail 201. The machine base 10 is also equipped with a press-fitting power source (such as a hydraulic press, drive motor, etc., not shown in the figure), which is driven and connected to the movable frame 210 to drive the movable frame 210 to move along the longitudinal direction of the machine base 10 and to provide press-fitting power through the press-fitting power source.

[0050] The sprocket positioning shaft 220 is rotatably mounted in the movable frame 210. An expansion clamp is provided in the sprocket positioning shaft 220 to fix the sprocket 102 on the sprocket positioning shaft 220 (not completely fixed, so that during pressing, the pressing force is greater than the friction force, and it can slide relative to the sprocket, so that the sprocket 102 can be pushed out of the sprocket positioning shaft 220) so that the sprocket 102 can rotate with the sprocket positioning shaft 220.

[0051] The sprocket positioning shaft 220 is also slidably connected to the movable frame 210 along the axial direction, so that after the sprocket positioning shaft 220 contacts the corresponding camshaft shaft 101, the movable frame 210 can continue to move to push and press the sprocket 102 on the sprocket positioning shaft 220 onto the corresponding camshaft shaft 101.

[0052] Please refer to further details. Figure 4 and Figure 5 The keyway positioning assembly includes a positioning rod 233, which is elastically mounted on the movable frame 210 along the longitudinal direction of the machine base 10. When the keyway of the sprocket 102 rotates with the sprocket positioning shaft 220, the positioning rod 233 can pop out and embed into the keyway of the sprocket 102, so as to position the keyway of the sprocket 102 at the position of the positioning rod 233.

[0053] The positioning rod 233 has beveled edges on both sides to prevent scratching the sprocket 102. When the sprocket 102 is assembled on the second positioning module 20, if the edge of its keyway is located in the positioning area of ​​the positioning rod 233, the positioning rod 233 can be pressed down. As the sprocket 102 rotates (one rotation is enough to complete the alignment requirement), the positioning rod 233 can be gradually embedded during rotation through the beveled edges. This avoids the problem that the positioning rod 233 cannot be effectively embedded in the keyway due to elastic response delay, thus ensuring the reliability of the embedding and positioning.

[0054] After the positioning rod 233 is embedded in the keyway of the sprocket 102, during press-fitting, the positioning rod 233 can also be used to guide the press-fitting direction of the sprocket 102 to ensure press-fitting accuracy. Correspondingly, the length of the positioning rod 233 can be adaptively set according to the length of the corresponding part of the camshaft body 101. During the press-fitting interference stage, the positioning pin can push out the positioning rod 233.

[0055] To ensure the coaxiality of the sprocket 102 during its movement to the mounting position of the camshaft body 101, a conformal mating groove can be provided at the end of the sprocket positioning shaft 220 that mates with the camshaft body 101, thereby extending the length of the coaxial guide section of the camshaft body 101 to the sprocket 102 and improving the coaxial guiding and positioning effect.

[0056] To prevent the sprocket 102 from shifting during the pressing process, in this embodiment, the second positioning module 20 also includes a sprocket locking assembly 240. Please refer to [link / reference needed]. Figure 9 The sprocket locking assembly 240 includes a movable block 241 and a guide plate 242. The movable block 241 is vertically and movably disposed at the bottom of the movable frame 210, and the top of the movable block 241 points to the sprocket mounting position of the sprocket positioning shaft 220. A friction pad 2411 is provided on the top of the movable block 241. The guide plate 242 is disposed along the push-out path of the movable frame 242, and two plates are disposed at intervals therebetween.

[0057] A first guide groove is provided on the inner side of the guide plate 242. The bottom of the movable block 241 extends laterally into the first guide groove. As the movable block 241 moves toward the first positioning module 30 along with the movable frame 210, it can be lifted and pressed against the sprocket 102 positioned on the sprocket positioning shaft 220 under the constraint of the first guide groove. The friction pad 2411 mainly provides auxiliary fixation after pressing. The material is, for example, a high-temperature resistant friction material such as powder metallurgy friction material or carbon fiber friction material, to ensure the fixing effect.

[0058] To facilitate the cyclic movement of the movable block 241, in this embodiment, the first guide groove includes a first guide groove and a second guide groove arranged sequentially along the direction pointing to the first positioning module 30. The first guide groove is a horizontal single groove structure and is located at the bottom. A partition strip 2421 is provided in the middle of the second guide groove to divide the second guide groove into upper and lower grooves. A stop bar 2422 is provided at the end of the partition strip 2421 away from the first positioning module 30. The stop bar 2422 is connected to the guide plate 242 through a torsion spring. The upper and lower grooves are connected at the end closer to the first positioning module 30.

[0059] When the movable block 241 moves to the position of the stop lever 2422, it can be moved to the upper groove of the second guide groove via the stop lever 2422 to lift the movable block 241. After the sprocket 102 is pressed onto the camshaft shaft 101, the movable block 241 can be transferred from the end of the upper and lower grooves to the lower groove, releasing the lock on the sprocket 102 so that the movable block 241 can disengage from the sprocket 102 and retract with the movable frame 210. When it retracts to the position of the stop lever 2422, the stop lever 2422 can be pushed open to return to the first guide groove. Under the action of the torsion spring, the stop lever 2422 returns to its original position so as to guide the lifting of the movable block 241 in the next working process.

[0060] The cylindrical part of the movable block 241 is fitted with a return spring 2412 so that the movable block 241 can be springed back from the ends of the upper and lower grooves to the lower groove.

[0061] The lengths of the first and second guide grooves of the guide plate 242 can be set according to the specific structure. During the travel time of the first guide groove, the sprocket positioning shaft 220 can rotate one revolution to complete the keyway positioning of the sprocket 102. After the keyway positioning is completed, it moves to the second guide groove section. When the sprocket 102 is pressed into place or released from the positioning pin, the movable block 241 moves to the end of the upper and lower grooves and springs back to the lower groove.

[0062] like Figure 5 , Figure 7 and Figure 8 As shown, the expansion clamp includes at least one contact block 221 arranged around the sprocket positioning shaft 220. The contact block 221 is radially movably arranged in the sprocket positioning shaft 220 and elastically connected to the sprocket positioning shaft 220 by a first spring, so as to provide an outward pre-tightening elastic force through the first spring, thereby pre-tightening and fixing the sprocket 102 to the sprocket positioning shaft 220.

[0063] To improve the pre-tightening and fixing effect of the contact block 221 on the sprocket 102, in this embodiment, a fixed frame 202 is also fixedly installed on the machine base 10, and the fixed frame 202 extends into the movable frame 210; the sprocket positioning shaft 220 is a hollow structure, and a guide frame 222 is also provided inside the sprocket positioning shaft 220. The guide frame 222 is fixedly connected to the fixed frame 202, and a second guide groove is provided in the guide frame 222. The second guide groove is provided with a guide section and a positioning section extending outward along the axial direction of the sprocket positioning shaft 220. The guide section is inclined outward, and the positioning section is parallel to the axial direction of the sprocket positioning shaft 220; the contact block 221 also extends laterally into the corresponding second guide groove.

[0064] When the sprocket 102 is fed onto the sprocket positioning shaft 220, the contact block 221 is located at the root of the second guide groove in the guide frame 222. The contact block 221 can be positioned inside the sprocket positioning shaft 220 to avoid obstructing the feeding of the sprocket 102. After the sprocket 102 is fed, as the movable frame 210 moves, the guide frame 222 is fixed relative to the machine base 10, and the contact block 221 moves along the second guide groove and expands outward, which can fix the sprocket 102 on the sprocket positioning shaft 220.

[0065] At least two contact blocks 221 are provided and are evenly distributed around the sprocket positioning shaft 220. Their synchronous operation can ensure the coaxiality of the sprocket 102 fixed to the sprocket positioning shaft 220.

[0066] In an optional embodiment, the outer side of the top surface of the contact block 221 is set as an inclined surface. When the sprocket 102 is feeding, the contact block 221 can be pressed down by the inclined surface structure, thereby completing the fixation (circumferential fixation) of the sprocket 102 to the sprocket positioning shaft 220 during feeding.

[0067] Please refer to further details. Figure 6 To facilitate the installation of the positioning rod 233, in this embodiment, the movable frame 210 is provided with a chassis 231 that fits and matches the wheel surface of the sprocket 102. The chassis 231 is provided with a first opening structure 2311, and the positioning rod 233 is disposed in the first opening structure 2311 and elastically connected to the chassis 231 through a second spring 2331. This allows the positioning rod 233 to elastically point outward toward the sprocket 102. When the keyway of the sprocket 102 is aligned with the positioning rod 233, the positioning rod 233 can pop out and embed into the keyway of the sprocket 102, thereby achieving the positioning of the keyway of the sprocket 102.

[0068] To prevent friction between the sprocket 102 and the positioning rod 233 from interfering with its rotation, in this embodiment, a ball bearing is provided at the outer end of the positioning rod 233.

[0069] To avoid the impact of the preload of the positioning rod 233 on the feeding stability of the sprocket 102, in this embodiment, a second opening structure 2312 is also provided in the chassis 231. The second opening structure 2312 is connected to the first opening structure 2312. The keyway positioning assembly also includes a first limiting member 232 and a second limiting member 234. The first limiting member 232 is disposed in the second opening structure 2312 and fixed to the fixing frame 202. The second limiting member 234 is disposed in the communication area between the second opening structure 2312 and the first opening structure 2311. A fourth spring 2341 is provided between the second limiting member 234 and the chassis 231 to meet the movement requirements of the second limiting member 234.

[0070] When the movable frame 210 moves toward the first positioning module 30, the first limiting member 232 is fixed to the machine base 10 by the fixing frame 202, and can gradually withdraw from the second opening structure 2312, thereby releasing the limitation on the second limiting member 234. Under the action of the fourth spring 2341, the second limiting member 234 can shift from the first opening structure 2311 to the second opening structure 2312 to release the limitation on the positioning rod 233, so that the positioning rod 233 can extend out of the first opening structure 2311 and be embedded in the keyway of the sprocket 102.

[0071] To facilitate the next pressing cycle, the end of the first limiting member 232 has a beveled structure. When the chassis 231 retracts with the movable frame 210, the first limiting member 232 is embedded in the second opening structure 2312, which can press the second limiting member 234 against the first opening structure 2311. The positioning rod 233 has an opening for positioning the second limiting member 234. The second limiting member 234 contacts the beveled surface of the positioning rod 233. When the second limiting member 234 presses against the first opening structure 2311, its contact bevel can push the positioning rod 233 back, so that the end of the positioning rod 233 retracts into the first opening structure 2311 and returns to its initial position, so that the sprocket can be loaded in the next pressing cycle.

[0072] After the keyway of the sprocket 102 is positioned, the sprocket 102 needs to be transferred from the sprocket positioning shaft 220 to the camshaft body 101. At this time, the sprocket positioning shaft 220 is abutted and fixed to the end of the camshaft body 101 and fixed by the camshaft body 101. The movable frame 210 continues to move, pushing out the sprocket 102 and pressing it onto the camshaft body 101.

[0073] After pressing, the sprocket positioning shaft 220 is located inside the movable frame 210. To facilitate the next loading, the sprocket positioning shaft 220 needs to be reset and extended. In this embodiment, as shown... Figure 4 As shown, a third spring 2201 is provided between the sprocket positioning shaft 220 and the movable frame 210, so that after the sprocket 102 is pressed onto the corresponding camshaft shaft 101 and the movable frame 210 is retracted, the sprocket positioning shaft 220 can extend out of the movable frame 210 and reset under the action of the third spring 2201, so that the expansion clamp is exposed to the outside.

[0074] To facilitate the arrangement of the third spring 2201, in this embodiment, the sprocket positioning shaft 220 is also axially fixed to the chassis 231. The third spring 2201 is arranged between the movable frame 210 and the chassis 231, and there is sufficient space available for arrangement, so multiple third springs 2201 can be arranged.

[0075] A complementary sliding groove is provided between the chassis 231 and the movable frame 210 to ensure the circumferential fixation of the chassis 231 and its axial mobility.

[0076] The drive motor of the sprocket positioning shaft 220 is fixedly mounted in the movable frame 210. When the sprocket positioning shaft 220 abuts against the camshaft shaft 101, the drive motor of the sprocket positioning shaft 220 continues to move along with the movable frame 210. To ensure the reliability of its transmission structure, in this embodiment, the available contact stroke of the transmission gear fixed on the sprocket positioning shaft 220 and the output gear of the drive motor in the axial direction is greater than or equal to the active stroke between the sprocket positioning shaft 220 and the movable frame 210, so that the transmission gear remains in a meshed state throughout the relative movement between the sprocket positioning shaft 220 and the movable frame 210, which can ensure the reliability of its transmission structure in the cyclic activity of the equipment.

[0077] This invention achieves sprocket keyway positioning through a simple rotation drive of a mechanical structure combined with a sprocket positioning shaft. This effectively reduces the cost of automated press-fitting of camshaft sprockets, lowers production costs, and improves production efficiency.

[0078] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] The above-described embodiments are merely illustrative of several specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A camshaft sprocket automatic press fitting device characterized by comprising: include: The machine platform, and a first positioning module and a second positioning module disposed opposite to each other on the machine platform along its longitudinal direction, wherein... The first positioning module is used to fix the pre-positioned camshaft body, so as to fix the camshaft body along the longitudinal direction of the machine tool and position the positioning pin on the camshaft body at the predetermined position. The second positioning module is used for positioning the sprocket to align and match the keyway of the sprocket with the positioning pin. The second positioning module includes a movable frame, a sprocket positioning shaft, and a keyway positioning assembly. The movable frame is slidably mounted on the machine platform along the longitudinal direction of the machine platform and is connected to the press-fitting power source for pressing the sprocket onto the camshaft body via the movable frame; The sprocket positioning shaft is rotatably disposed in the movable frame and is coaxially aligned with the camshaft shaft positioned on the first positioning module. An expansion clamp is provided in the sprocket positioning shaft to fix the sprocket on the sprocket positioning shaft so that the sprocket can rotate with the sprocket positioning shaft. The sprocket positioning shaft is also slidably connected to the movable frame along the axial direction, so that after the sprocket positioning shaft contacts the corresponding camshaft body, the movable frame can continue to move to push and press the sprocket on the sprocket positioning shaft onto the corresponding camshaft body. The keyway positioning assembly includes a positioning rod, which is elastically mounted on the movable frame along the longitudinal direction of the machine tool. When the keyway of the sprocket rotates to the position of the positioning rod as the sprocket follows the sprocket positioning shaft, the positioning rod can pop out and embed into the keyway of the sprocket, so as to position the keyway of the sprocket at the position of the positioning rod. The second positioning module further includes the sprocket locking assembly, which comprises a movable block and a guide plate. The movable block is vertically and movably mounted at the bottom of the movable frame, the top of the movable block points to the sprocket mounting position of the sprocket positioning shaft, and a friction pad is provided on the top of the movable block; The guide plate is arranged along the ejection path of the movable frame, and two plates are arranged at intervals opposite to each other. A first guide groove is provided on the inner side of the guide plate. The bottom of the movable block extends laterally into the first guide groove and is arranged therein. It is used to lift and press the movable block against the sprocket positioned on the sprocket positioning shaft as the movable block moves toward the first positioning module along with the movable frame. The first guide groove includes a first guide groove and a second guide groove arranged sequentially along the direction pointing to the first positioning module. The first guide groove is a horizontal single groove structure and is located at the bottom. A dividing strip is provided in the middle of the second guide groove to divide the second guide groove into upper and lower grooves. A stop bar is provided at the end of the dividing strip away from the first positioning module. The stop bar is connected to the guide plate through a torsion spring. The upper and lower grooves are connected at the end closer to the first positioning module. After the sprocket is pressed into the camshaft body, the movable block can be moved from the end of the upper and lower grooves to the lower groove, thereby releasing the lock on the sprocket.

2. The automatic pressing device for camshaft sprockets according to claim 1, characterized in that, The expansion clamp includes at least one contact block disposed around the sprocket positioning shaft. The contact block is radially disposed in the sprocket positioning shaft and elastically connected to the sprocket positioning shaft via a first spring.

3. The automatic pressing device for camshaft sprockets according to claim 2, characterized in that, A fixed frame is also fixedly installed on the machine base, and the fixed frame extends into the movable frame. The sprocket positioning shaft has a hollow structure, and a guide frame is also provided inside the sprocket positioning shaft. The guide frame is fixedly connected to the fixed frame. A second guide groove is provided in the guide frame. A guide section and a positioning section are provided in the second guide groove outward along the axial direction of the sprocket positioning shaft. The guide section is inclined outward, and the positioning section is parallel to the axial direction of the sprocket positioning shaft. The contact block also extends laterally into the corresponding second guide groove.

4. The automatic pressing device for camshaft sprockets according to claim 1, characterized in that, The movable frame is provided with a chassis that fits and matches the wheel surface of the sprocket. The chassis is provided with a first opening structure, and the positioning rod is disposed in the first opening structure and is elastically connected to the chassis by a second spring.

5. The automatic pressing device for camshaft sprockets according to claim 4, characterized in that, The outer end of the positioning rod is provided with a ball bearing.

6. The automatic pressing device for camshaft sprockets according to claim 4, characterized in that, A fixed frame is also fixedly installed on the machine base, and the fixed frame extends into the movable frame. The chassis is also provided with a second opening structure, which is connected to the first opening structure. The keyway positioning assembly further includes a first limiting member and a second limiting member. The first limiting member is disposed in the second opening structure and fixed to the fixing frame. The second limiting member is elastically disposed in the communication area between the second opening structure and the first opening structure. As the movable frame moves toward the first positioning module, the first limiting member can gradually withdraw from the second opening structure, thereby releasing the restriction on the second limiting member. This allows the second limiting member to shift from the first opening structure to the second opening structure, thereby releasing the restriction on the positioning rod. The positioning rod can then extend from the first opening structure and embed itself in the keyway of the sprocket.

7. The automatic pressing device for camshaft sprockets according to claim 1, characterized in that, The first positioning module includes a plurality of mechanical clamps and support blocks arranged at intervals along the longitudinal direction of the machine tool, wherein the support blocks are arranged in a direction away from the second positioning module.

8. The automatic pressing device for camshaft sprockets according to claim 1, characterized in that, A third spring is provided between the sprocket positioning shaft and the movable frame, so that after the sprocket is pressed onto the corresponding camshaft body and the movable frame is retracted, the sprocket positioning shaft can extend out of the movable frame and reset, so that the expansion clamp is exposed to the outside.

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