CN114559232B - Multidimensional Ultrasonic Vibration Assisted Assembly Island of Knurled Assembled Camshaft - Google Patents

Abstract

A knurled assembled camshaft multi-dimensional ultrasonic vibration auxiliary assembly island, including a clamp for clamping the cam and a locking mechanism for fixing the camshaft tube, and a press-fitting platform for driving the camshaft tube toward the clamp One side of the fixed platform moves, and the camshaft tube passes through the through hole on the fixture to cooperate with the hydraulic damping thimble to complete the centering press-fitting of a cam and the camshaft tube. At the same time, the press-fitting platform is also used to drive the cam The shaft tube retracts to the initial position, and also includes a drive motor, which is used to drive the integrated indexing handle to rotate axially when the next cam is centered and pressed on the camshaft tube, so that the camshaft tube can be installed according to the next cam installation angle Repositioning is required. The present invention improves assembly efficiency, precision and stability by clamping device, positioning device, additional excitation, ultrasonic vibration and other means. The loading force has improved the quality of pressing.

Description

Multidimensional Ultrasonic Vibration Assisted Assembly Island of Knurled Assembled Camshaft

technical field

The invention relates to the field of assembly of automobile parts, in particular to an assembly island of an assembled camshaft.

Background technique

Assembled camshafts are obtained through separate processing of each component and then assembled. It has become a new development direction of the camshaft manufacturing industry. The market share of assembled camshafts continues to grow. The main reason is that it has an integrated structure, which greatly Reduced weight of parts. As the key technology of the assembled camshaft, the connection of split parts is generally adopted by the conventional press-fit method without auxiliary vibration, which requires a large press-fit force and large equipment loss; the relative angle of the cam installation needs to be realized by manually adjusting the cam fixture. The assembly efficiency is low, and the accuracy is difficult to guarantee; at the same time, there is no auxiliary centering device at the lower end of the camshaft tube, which obviously has problems such as poor assembly accuracy, low assembly efficiency, and low product qualification rate. , convenient and accurate connection technology for the split parts of the assembled camshaft.

Contents of the invention

The purpose of the present invention is to avoid the disadvantages of the prior art and provide a knurled assembly camshaft multi-dimensional ultrasonic vibration auxiliary assembly island which is simple in structure, easy to use, and can improve the assembly efficiency and quality of the knurled assembly camshaft.

In order to achieve the above object, the technical solution adopted by the present invention is: a knurled assembled camshaft multi-dimensional ultrasonic vibration auxiliary assembly island, including a frame base, a fixed platform, a press-fit platform and a frame coaxially arranged in sequence from bottom to top The top seat, a guide rail is fixed between the frame base and the frame top seat, and the guide rail is passed through the fixed platform and the press-fitting platform, the fixed platform is fixedly connected with the guide rail, and the The press-fitting platform is slidingly installed between the fixed platform and the top seat of the rack through guide rails;

The clamp used to fix the cam is installed on the fixed platform, and the fixed platform and the clamp are correspondingly provided with a through hole for installing the camshaft tube on the cam; corresponding to the through hole on the frame base Features hydraulic damping thimbles for auxiliary centering of camshaft tubes;

A multi-dimensional vibration system and a drive motor are installed on the press-fitting platform. The multi-dimensional vibration system includes an integrated indexing handle and a longitudinal torsion horn equipped with an ultrasonic transducer. The integrated indexing handle One end of the movable rotating support is installed on the press-fitting platform and is connected with the drive motor. The other end of the integrated indexing handle is connected to the camshaft tube for locking and quick centering through the longitudinal torsion horn. a locking mechanism, the longitudinal torsion horn is used to transform the longitudinal ultrasonic vibration generated by the ultrasonic transducer into a longitudinal and torsional composite vibration, and transmit the composite vibration to the locking mechanism;

The clamp is used to clamp the cam, one end of the camshaft tube is locked and fixed on the locking mechanism, and the press-fit platform is used to drive the camshaft tube towards the side of the fixed platform The other end of the camshaft tube cooperates with the hydraulic damping thimble passing through the through hole to complete the centering press-fitting of a cam and the camshaft tube. At the same time, the press-fitting platform is also used to drive the camshaft tube Returning to the initial position, the drive motor is used to drive the integrated index handle to rotate axially when the next cam is centered and pressed on the camshaft tube, so that the camshaft tube can be indexed according to the installation angle requirement of the next cam.

Further, the integrated indexing handle of the multi-dimensional vibration system includes a circular base for installing the ultrasonic receiving component, and a central support shaft is arranged in the center of the circular surface on one side of the circular base, and the central support shaft passes through and The rotary support is installed on the press-fitting platform, and the second connecting gear provided at the end of the output shaft of the driving motor meshes with the first connecting gear provided at the end of the central support shaft protruding from the press-fitting platform, In this way, the axial rotation positioning of the integrated indexing handle is realized; on the other circular surface of the circular base, there is a hollow cylinder for installing an ultrasonic transducer, and the longitudinal torsion horn It is fixedly installed on the cylinder at the opening of the cavity of the hollow cylinder, where various fixed connection methods such as clamping and flange can be used;

A circular ultrasonic receiving assembly is provided on the circular base between the press-fitting platform and the circular base, and a circular ultrasonic emitting assembly corresponding to the circular ultrasonic receiving assembly is provided on the press-fitting platform There is a gap between the circular ultrasonic emitting assembly and the circular ultrasonic receiving assembly, and they are connected by electromagnetic induction. The circular ultrasonic receiving assembly, the circular ultrasonic emitting assembly and the circular base are the same axis settings.

Further, the circular ultrasonic receiving component and the circular ultrasonic emitting component are respectively arranged in the circular groove on the circular base and the press-fit platform; the circular ultrasonic receiving component and the circular ultrasonic transmitting component The gap between them is 1-2mm;

The ultrasonic transmitting assembly includes a U-shaped main-side ferrite housing installed in the annular groove and a main-side induction coil arranged in the main-side ferrite housing; the annular ultrasonic receiving assembly includes an installation A secondary side ferrite housing with a U-shaped section in the annular groove and a secondary induction coil arranged in the secondary side ferrite housing;

The primary side induction coil is connected to the ultrasonic power supply to convert the electrical signal into a magnetic field signal; the secondary side induction coil is electrically connected to the ultrasonic transducer to convert the magnetic field signal into an electrical signal to realize wireless transmission of the ultrasonic power supply , enabling the unconstrained rotation of the integrated indexing handle on the press-fitting platform.

Further, the ultrasonic transducer is a piezoelectric ceramic ultrasonic transducer, the ultrasonic transducer is installed on the longitudinal torsion horn in the hollow cylinder, and the ultrasonic transducer passes through the longitudinal The twisted horn transmits the compound vibration to the locking mechanism;

The ultrasonic frequency of the ultrasonic transducer is 20-40 KHz, the longitudinal ultrasonic amplitude is 10-12 μm, the amplitude fluctuation is less than 2 μm, and the longitudinal-torsion conversion ratio of the longitudinal twist horn is 1:0.6.

Further, the clamp includes a fixed bottom plate, which is fixedly installed on the fixed platform, and a fixed block and a sliding block for clamping the cam are correspondingly provided on the fixed bottom plate; the sliding block slides set on a fixed base;

The opposite ends of the fixed block and the sliding block are provided with cavities for accommodating contact wheels, and the two contact wheels provided at the opening of the cavity on one side of the fixed block are the first contact wheel and the second contact wheel. Wheels, the two contact wheels provided at the opening of the cavity on one side of the sliding block are the third contact wheel and the fourth contact wheel;

The fixed block and the sliding block at the opening of the cavity are correspondingly provided with gaps for exposing the four contact wheels, so that the four contact wheels directly contact the cam in four directions and press the cam;

The through holes are arranged on the fixed bottom plate and correspond to the four positioned cam holes of the contact wheels.

Further, the sliding block is slidably connected to the fixed base plate through the dovetail groove, and the notches are a pair of arc-shaped notches, exposing the contact between the axes of the four contact wheels and the center of the through hole. wheel body.

Further, a piston bracket is provided on the press-fitting platform between the press-fitting platform and the top seat of the frame, the fixed end of the thrust piston is fixedly installed on the top seat of the frame, and the movable end of the thrust piston is connected to the On the piston bracket, the thrust piston is used to push and reset the pressing platform; the thrust piston is a hydraulic piston;

The hydraulic damping thimble is also a hydraulic piston, and a conical thimble is provided at the movable end of the hydraulic damping thimble.

Further, the locking mechanism includes a thimble inner core and a thimble outer cover, one end of the thimble inner core is fixedly installed on the longitudinal torsion horn, and the end face center of the thimble inner core matched with the hydraulic damping thimble An accommodating groove for accommodating the camshaft tube is provided, and a positioning thimble is arranged on the bottom of the accommodating groove. The bottom of the tank gradually increases;

The thimble outer cover is set and fixed on the outside of the positioning thimble receiving groove through the engagement of the spiral groove. The inner wall of the thimble outer cover is provided with an annular U-shaped sleeve that matches the annular tapered inner wall surface. The annular sleeve wall of the annular U-shaped sleeve between the U-shaped sleeve and the annular tapered inner wall surface is provided with a positioning pin for clamping and positioning the camshaft tube, and one end of the camshaft tube enters the accommodating After the groove, tighten the annular U-shaped sleeve, and the inner wall surface of the annular tapered shape pushes out the locating pin, thereby realizing the fast fastening and fixing of the camshaft tube;

There are at least two pairs of positioning pins arranged in the circumferential direction of the annular sleeve wall of the annular U-shaped sleeve.

Further, a spiral groove is provided on the longitudinal torsion horn to convert the longitudinal vibration generated by the ultrasonic transducer into a composite vibration of longitudinal and torsional vibration at the end of the longitudinal torsion horn;

The longitudinal torsion horn and the inner core of the thimble are integrated to ensure the consistency of the ultrasonic vibration shape.

Further, the initial assembly gap between the cam and the camshaft tube for knurling assembly is 0.05-0.15mm, and after the knurling assembly is completed, the interference between the camshaft tube and the cam is 0.15-0.30mm.

The beneficial effects of the present invention are: the function of the present invention is to complete the assembly of the knurled assembled camshaft, and improve the assembly efficiency, precision and stability by clamping device, positioning device, additional excitation, ultrasonic vibration and other means. The multi-dimensional ultrasonic vibration is introduced in the press-fitting process of the knurled assembled camshaft, which effectively reduces the press-fitting force and improves the press-fitting quality. And designed the integrated indexable ultrasonic vibration system and high-precision positioning and clamping system of cam and shaft tube, realized the rapid positioning of hydraulic thrust press-fitting mobile platform, ultrasonic transducer, multi-dimensional ultrasonic longitudinal torsion horn and shaft tube The integrated installation of the core locking mechanism and the high-precision positioning and clamping of the cam and the shaft tube. The indexable ultrasonic vibration system uses the piezoelectric inverse effect of the ultrasonic transducer to convert the frequency electrical signal into a multi-dimensional composite vibration of ultrasonic frequency, and simultaneously transmits the multi-dimensional ultrasonic vibration to the shaft tube through the multi-dimensional ultrasonic longitudinal torsion horn for rapid centering Locking mechanism, the system is integrated in the hydraulic thrust press-fit mobile platform, the platform moves along the guide rail under the push of the hydraulic piston rod, and completes the multi-dimensional ultrasonic-assisted press-fit of the knurled assembled camshaft, and then quickly retreats and is controlled by the drive motor After the high-precision indexing, the above-mentioned press-fitting process is repeated to realize the high-precision and fast press-fitting of multiple cams on the same shaft tube, which greatly improves the assembly efficiency and quality. Significance;

The four-point positioning cam clamp is equipped with an adjustment mechanism to adapt to different sizes of cams and shaft tubes. Through a bottom surface and four contact points, the cams of different sizes can be fixed, while ensuring the relative position between the cams, which greatly improves the flexibility of the assembly island. .

The fast centering and locking mechanism of the shaft tube cooperates with the hydraulic damping thimble installed on the frame base to realize the fast centering of the shaft tube, and realizes four-point positioning and locking through the locking mechanism, which can effectively improve the shaft tube in the current conventional press-fitting process issues such as eccentricity.

At the same time, the knurled connection is an interference fit formed by knurling. The knurled connected assembled camshaft requires the outer diameter of the shaft tube and the inner hole of the cam to be a clearance fit before knurling. Considering the existence of processing and assembly errors , the smaller the gap between the two, the higher the requirements for processing accuracy and assembly equipment, and the higher the production cost; if the gap is too large, the interference after knurling will become smaller, and the connection strength will become lower; The multi-dimensional ultrasonic vibration can reduce the pressing force by about 25% while improving the connection strength, effectively improve the equipment bearing capacity, reduce equipment wear, and improve the assembly accuracy and connection strength.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the structural representation of fixture described in the present invention;

Fig. 3 is a structural schematic diagram of the multi-dimensional vibration system and the locking mechanism of the present invention.

In the figure: 1. frame base; 2. fixed platform; 3. fixture; 31. fixed bottom plate; 301. fixed block; 3011. first contact wheel; 3012. second contact wheel; 3021. third contact wheel; 3022 .the fourth contact wheel; 302. sliding block; 32. notch; 4. press-fit platform; 501. drive motor; 502. second connecting gear; 6. thrust piston; .Longitudinal torsion horn; 72. Integrated index handle; 703. Ultrasonic transducer; 704. Annular ultrasonic receiving component; 7041. Secondary ferrite shell; 7042. Secondary induction coil; 705. Annular ultrasonic transmitter Components; 7051. Main side ferrite shell; 7052. Main side induction coil; 706. First connecting gear; 721. Circular base; 722. Central support shaft; 723. Hollow cylinder; 8. Locking mechanism; 801 .Ejector inner core; 802. Ejector jacket; 803. Positioning pin; 804. Positioning thimble; 9. Hydraulic damping thimble; 10. Through hole;

detailed description

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

In order to achieve the above object, the present invention provides the following specific implementation methods:

Embodiment 1: A multi-dimensional ultrasonic vibration auxiliary assembly island for a knurled assembled camshaft, including a frame base 1, a fixed platform 2, a press-fit platform 4 and a frame top seat 11 arranged coaxially from bottom to top in sequence. A guide rail 12 is fixed between the frame base 1 and the frame top seat 11, and the guide rail 12 is installed on the fixed platform 2 and the press-fit platform 4, the fixed platform 2 is fixedly connected with the guide rail 12, and the press-fit platform 4 slides through the guide rail 12 Installed between the fixed platform 2 and the frame top 11;

The clamp 3 used to fix the cam is installed on the fixed platform 2, and the fixed platform 2 and the clamp 3 are correspondingly provided with a through hole 10 for installing the camshaft tube on the cam; For the hydraulic damping thimble 9 of the auxiliary centering camshaft tube, the hydraulic damping thimble 9 is a hydraulic piston, and a conical thimble is arranged at the movable end of the hydraulic damping thimble 9;

The clamp 3 includes a fixed base plate 31, which is fixedly installed on the fixed platform 2, and a fixed block 301 and a sliding block 302 for clamping the cam are correspondingly provided on the fixed base plate 31; the sliding block 302 is slidably connected to the fixed base plate through a dovetail groove 31; the opposite ends of the fixed block 301 and the sliding block 302 are provided with a cavity for accommodating the contact wheels, and the two contact wheels provided at the opening of the cavity on one side of the fixed block 301 are the first contact wheel 3011 and the second contact wheel. Two contact wheels 3012, the two contact wheels provided at the cavity opening on one side of the sliding block 302 are the third contact wheel 3021 and the fourth contact wheel 3022; on the fixed block 301 and the sliding block 302 at the cavity opening Correspondingly, there are notches 32 for exposing the four contact wheels, so that the four contact wheels directly contact the cam and compress the cam in four directions. The contact wheel body on the line connecting the center of the through hole 10; the through hole 10 is arranged on the fixed bottom plate 31, and is set corresponding to the four positioned cam holes of the contact wheel.

The press-fitting platform 4 between the press-fitting platform 4 and the frame top seat 11 is provided with a piston bracket 61, the fixed end of the thrust piston 6 is fixedly installed on the frame top seat 11, and the movable end of the thrust piston 6 is connected to the piston bracket 61, the thrust piston 6 is used to push and reset the press-fitting platform 4; the thrust piston 6 is a hydraulic piston;

A multi-dimensional vibration system 7 and a drive motor 501 are installed on the press-fitting platform 4, the multi-dimensional vibration system 7 includes an integrated index handle 72 and a longitudinal torsion horn 701 equipped with an ultrasonic transducer 703, One end of the integrated indexing handle 72 is mounted on the press-fitting platform 4 and is connected to the drive motor 501 through a movable rotating support at one end, and the other end of the integrated indexing handle 72 is passed through the longitudinally twisted horn 701 A locking mechanism 8 for locking the camshaft tube and quickly centering is connected, and the longitudinal torsion horn 701 is used to transform the longitudinal ultrasonic vibration generated by the ultrasonic transducer 703 into longitudinal and torsional compound vibration, And transmit the composite vibration to the locking mechanism 8;

The integrated indexing handle 72 of the multi-dimensional vibration system 7 includes a circular base 721 for installing the ultrasonic receiving assembly 704, and a central support shaft 722 is arranged at the center of the circular surface on one side of the circular base 721, and the central support shaft 722 passes through Set and rotatably support and install on the press-fitting platform 4, the second connecting gear 502 provided at the end of the output shaft of the drive motor 501 is engaged with the first connecting gear 706 provided at the end of the central support shaft 722 protruding from the press-fitting platform 4 , so as to realize the axial rotation positioning of the integrated indexing handle 72; on the other circular surface of the circular base 721, there is a hollow cylinder 723 for installing the ultrasonic transducer 703, and the longitudinal torsion horn 701 passes through The flange is fixedly installed on the cylinder at the cavity opening of the hollow cylinder 723;

On the circular base 721 between the press-fitting platform 4 and the circular base 721, a circular ultrasonic receiving component 704 is provided, and on the press-fitting platform 4, there is a corresponding setting for the circular ultrasonic receiving component 704. The annular ultrasonic emitting assembly 705, the annular ultrasonic emitting assembly 705 and the annular ultrasonic receiving assembly 704 are provided with a gap, and are connected by electromagnetic induction, the annular ultrasonic receiving assembly 704, the annular ultrasonic receiving assembly 704 The launch assembly 705 is arranged coaxially with the circular base 721 .

The annular ultrasonic receiving assembly 704 and the annular ultrasonic emitting assembly 705 are respectively arranged in the annular groove on the circular base 721 and the press-fitting platform 4; the gap between the annular ultrasonic receiving assembly 704 and the annular ultrasonic emitting assembly 705 is 1-2mm;

The ultrasonic transmitting assembly 705 includes a main side ferrite housing 7051 with a U-shaped section installed in the annular groove and a main side induction coil 7052 arranged in the main side ferrite housing 7051; the annular ultrasonic receiving assembly 704 includes an annular The inner section of the groove is a U-shaped secondary side ferrite housing 7041 and the secondary side induction coil 7042 arranged in the secondary side ferrite housing 7041;

The primary side induction coil 7052 is connected to the ultrasonic power supply to convert the electrical signal into a magnetic field signal; the secondary side induction coil 7042 is electrically connected to the ultrasonic transducer 703 to convert the magnetic field signal into an electrical signal to realize the wireless transmission of the ultrasonic power supply and make the integrated Unconstrained rotation of the type index handle 72 on the press-fitting platform 4 .

The ultrasonic transducer 703 is a piezoelectric ceramic ultrasonic transducer, and the ultrasonic transducer 703 is installed on the longitudinal torsion horn 701 in the hollow cylinder 723, and the ultrasonic transducer 703 transmits the compound vibration through the longitudinal torsion horn 701 Transfer to the locking mechanism 8;

The ultrasonic frequency of the ultrasonic transducer 703 is 20-40KHz, the longitudinal ultrasonic amplitude is 10-12 μm, the amplitude fluctuation is less than 2 μm, and the longitudinal-torsion conversion ratio of the longitudinal torsion horn 701 is 1:0.6.

The locking mechanism 8 includes a thimble inner core 801 and a thimble outer cover 802. One end of the thimble inner core 801 is fixedly installed on the longitudinal torsion horn 701. The center of the end face of the thimble inner core 801 matched with the hydraulic damping thimble 9 is provided with a camshaft tube. The accommodation groove is provided with a positioning thimble 804 on the bottom of the accommodation groove, the inner wall of the accommodation groove is an annular tapered inner wall, and the inclination angle of the annular tapered inner wall gradually increases along the notch of the accommodation groove to the bottom of the groove;

The thimble cover 802 is set and fixed on the outside of the positioning thimble 804 receiving groove through the engagement of the spiral groove. The inner wall of the thimble cover 802 is provided with an annular U-shaped sleeve that matches the annular tapered inner wall surface. The annular sleeve wall of the annular U-shaped sleeve between the tapered inner walls is provided with a positioning pin 803 for clamping and positioning the camshaft tube. After one end of the camshaft tube enters the receiving groove, tighten the annular U-shaped sleeve. The ring-shaped tapered inner wall pushes out the positioning pins 803, realizing fast fastening and fixing the center of the camshaft tube; there are at least two pairs of positioning pins 803 arranged in the circumferential direction of the annular sleeve wall of the annular U-shaped sleeve.

Clamp the cam on the fixture 3, lock and fix one end of the camshaft tube on the locking mechanism 8, the press-fitting platform 4 drives the camshaft tube to move toward the side of the fixed platform 2, and the other end of the camshaft tube passes through the through hole The hydraulic damping thimble 9 of 10 cooperates to complete the centering press-fitting of a cam and the camshaft tube. After that, the press-fitting platform 4 will drive the shaft tube equipped with this cam back to the initial position, and then drive the integrated cam through the drive motor 501. The type indexing handle 72 rotates axially, so that the camshaft tube can be indexed according to the installation angle of the next cam, and then the next cam is fixed on the fixture 3, and the centering and pressing process is repeated to obtain a sequence of multiple cams according to different angles. The camshaft formed by centering and press-fitting with the camshaft tube. The initial assembly clearance of the knurled assembly between the cam and the camshaft tube is: 0.05-0.15mm. After the knurled assembly is completed, the interference between the camshaft tube and the cam is: 0.15-0.30mm.

After the first cam is installed on the specified position of the shaft tube according to the required angle, the press-fitting platform 4 will drive the shaft tube equipped with the first cam to return to the initial position quickly, and then drive the motor 501 and the first connecting gear 706, The second connecting gear 502 cooperates to accurately drive the rotation, index and position, so that the shaft tube can rotate with high precision according to the angle required by the second cam. After the shaft tube indexing is completed, the second cam is fixed on the cam fixture 3 On the top, push the shaft tube to move down through the hydraulic thrust device to complete the press-fitting of the second cam, and then repeat the above process until all the cams are installed at the specified position of the shaft tube according to the specified angle.

The present invention introduces a multi-dimensional vibration system 7 in the press-fitting process of the knurled assembled camshaft, and realizes a hydraulic thrust press-fitting mobile platform, an ultrasonic transducer, a multi-dimensional ultrasonic longitudinal torsion horn and a fast centering locking mechanism for the shaft tube The integrated installation effectively reduces the press-fitting force and improves the press-fitting quality, and is designed for positioning the cam, the clamp 3 and the locking mechanism 8 of the shaft tube, and the four-point positioning cam clamp 3 is equipped with an adjustment mechanism to adapt to different sizes The cams and shaft tubes of different sizes are fixed through a bottom surface and four contact points, while ensuring the relative position between the cams, which greatly improves the flexibility of the assembly island; the fast centering locking mechanism 8 of the shaft tube and the installation The hydraulic damping thimble 9 on the base of the frame cooperates to realize the quick centering of the shaft tube, and realizes four-point positioning and locking through the locking mechanism, which can effectively improve the problem of shaft tube eccentricity in the current conventional press-fitting process.

On the other hand, the indexable ultrasonic vibration system uses the piezoelectric inverse effect of the ultrasonic transducer 703 to convert the frequency electrical signal into a multi-dimensional composite vibration of ultrasonic frequency, and simultaneously transmits the multi-dimensional ultrasonic vibration through the multi-dimensional ultrasonic longitudinal torsion horn 701 To the shaft tube fast centering locking mechanism, this system is integrated in the hydraulic thrust press-fitting mobile platform, the platform moves along the guide rail under the push of the hydraulic piston rod, and completes the multi-dimensional ultrasonic-assisted press-fitting of the knurled assembled camshaft, and then quickly retreats And under the control of the driving motor, the above press-fitting process is cycled after high-precision indexing, so as to realize the high-precision and fast press-fitting of multiple cams on the same shaft tube, which greatly improves the assembly efficiency and quality. The development of component connection technology is of great significance.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (9)

1. A knurl assembly type camshaft multidimensional ultrasonic vibration auxiliary assembly island is characterized by comprising a rack base (1), a fixed platform (2), a press-fitting platform (4) and a rack top seat (11) which are coaxially arranged from bottom to top in sequence, wherein a guide rail (12) is fixedly arranged between the rack base (1) and the rack top seat (11), the guide rail (12) is arranged on the fixed platform (2) and the press-fitting platform (4) in a penetrating manner, the fixed platform (2) is fixedly connected with the guide rail (12), and the press-fitting platform (4) is slidably arranged between the fixed platform (2) and the rack top seat (11) through the guide rail (12);

a clamp (3) for fixing the cam is arranged on the fixing platform (2), and through holes (10) for mounting a cam shaft tube on the cam are correspondingly arranged on the fixing platform (2) and the clamp (3); a hydraulic damping thimble (9) for assisting in centering the camshaft tube is arranged on the frame base (1) corresponding to the through hole (10);

a multi-dimensional vibration system (7) and a driving motor (501) are mounted on the press-fitting platform (4), the multi-dimensional vibration system (7) comprises an integrated indexing handle (72) provided with an ultrasonic transducer (703) and a longitudinal torsional amplitude rod (701), one end of the integrated indexing handle (72) is movably and rotatably supported and mounted on the press-fitting platform (4) and is connected with the driving motor (501), the other end of the integrated indexing handle (72) is connected with a locking mechanism (8) used for locking a cam shaft tube and quickly centering through the longitudinal torsional amplitude rod (701), and the longitudinal torsional amplitude rod (701) is used for converting longitudinal ultrasonic vibration generated by the ultrasonic transducer (703) into longitudinal and torsional composite vibration and transmitting the composite vibration to the locking mechanism (8);

the clamp (3) is used for clamping the cam, one end of the camshaft tube is locked and fixed on the locking mechanism (8), the press-fitting platform (4) is used for driving the camshaft tube to move towards one side of the fixing platform (2), the other end of the camshaft tube is matched with a hydraulic damping ejector pin (9) penetrating through the through hole (10) to finish centering press-fitting of the cam and the camshaft tube, meanwhile, the press-fitting platform (4) is also used for driving the camshaft tube to retreat to an initial position, and the driving motor (501) is used for driving the integrated type transposition handle (72) to axially rotate when the next cam is centered and pressed, so that the camshaft tube can be transposed according to the requirement of the installation angle of the next cam;

the integrated indexing handle (72) of the multi-dimensional vibration system (7) comprises a circular base (721) for mounting an ultrasonic receiving assembly (704), a central supporting shaft (722) is arranged at the center of the circular surface on one side of the circular base (721), the central supporting shaft (722) penetrates through and is rotatably supported and mounted on the press-fitting platform (4), and a second connecting gear (502) arranged at the end part of an output shaft of the driving motor (501) is meshed with a first connecting gear (706) arranged at the end part of the central supporting shaft (722) extending out of the press-fitting platform (4), so that the axial rotary positioning of the integrated indexing handle (72) is realized; a hollow cylinder (723) for mounting an ultrasonic transducer (703) is arranged on the circular surface on the other side of the circular base (721), and the longitudinal torsion amplitude transformer (701) is fixedly mounted on the cylinder at the opening of the cavity of the hollow cylinder (723);

the pressing device is characterized in that a circular base (721) between the pressing platform (4) and the circular base (721) is provided with a circular ultrasonic receiving assembly (704), the pressing platform (4) is provided with a circular ultrasonic transmitting assembly (705) corresponding to the circular ultrasonic receiving assembly (704), a gap is formed between the circular ultrasonic transmitting assembly (705) and the circular ultrasonic receiving assembly (704) and is connected through electromagnetic induction, and the circular ultrasonic receiving assembly (704), the circular ultrasonic transmitting assembly (705) and the circular base (721) are coaxially arranged.

2. The multi-dimensional ultrasonic vibration-assisted assembling island of the knurled assembled camshaft according to claim 1, wherein the annular ultrasonic receiving assembly (704) and the annular ultrasonic transmitting assembly (705) are respectively arranged in annular grooves on the circular base (721) and the press-fitting platform (4); the gap between the circular ring ultrasonic receiving assembly (704) and the circular ring ultrasonic transmitting assembly (705) is 1-2mm;

the circular ring ultrasonic transmitting assembly (705) comprises a main side ferrite shell (7051) which is arranged in the annular groove and has a U-shaped section and a main side induction coil (7052) which is arranged in the main side ferrite shell (7051); the annular ultrasonic receiving component (704) comprises an auxiliary side ferrite shell (7041) which is arranged in the annular groove and has a U-shaped section and an auxiliary side induction coil (7042) which is arranged in the auxiliary side ferrite shell (7041);

the main side induction coil (7052) is connected with an ultrasonic power supply and converts an electric signal into a magnetic field signal; the secondary induction coil (7042) is electrically connected with the ultrasonic transducer (703) to convert a magnetic field signal into an electric signal, so that wireless transmission of an ultrasonic power supply is realized, and the integrated indexing handle (72) can rotate on the press-fitting platform (4) without restriction.

3. The multi-dimensional ultrasonic vibration-assisted assembly island of a knurled assembled camshaft according to claim 1, wherein the ultrasonic transducer (703) is a piezoelectric ceramic ultrasonic transducer, and the ultrasonic transducer (703) is mounted on a longitudinal torsion-transformation horn (701) in the hollow cylinder (723);

the ultrasonic frequency of the ultrasonic transducer (703) is 20-40 KHz, the longitudinal ultrasonic amplitude is 10-12 mu m, the amplitude fluctuation is less than 2 mu m, and the longitudinal-torsional transformation ratio of the longitudinal-torsional transformation amplitude transformer (701) is 1:0.6.

4. the multi-dimensional ultrasonic vibration-assisted assembly island of a knurled assembled camshaft according to claim 1, wherein the clamp (3) comprises a fixed bottom plate (31), the fixed bottom plate (31) is fixedly installed on the fixed platform (2), and a fixed block (301) and a sliding block (302) for clamping the cam are correspondingly arranged on the fixed bottom plate (31); the sliding block (302) is arranged on the fixed bottom plate (31) in a sliding manner;

cavities for containing contact wheels are formed in the opposite ends of the fixed block (301) and the sliding block (302), the two contact wheels arranged at the opening of the cavity on one side of the fixed block (301) are a first contact wheel (3011) and a second contact wheel (3012), and the two contact wheels arranged at the opening of the cavity on one side of the sliding block (302) are a third contact wheel (3021) and a fourth contact wheel (3022);

notches (32) for exposing the four contact wheels are correspondingly arranged on the fixed block (301) and the sliding block (302) at the opening of the cavity, so that the four contact wheels directly contact the cam in four directions and press the cam;

the through hole (10) is arranged on the fixed bottom plate (31) and corresponds to the cam holes positioned by the four contact wheels.

5. The multi-dimensional ultrasonic vibration auxiliary assembly island of the knurled assembled camshaft according to claim 4, wherein the sliding block (302) is slidably connected to the fixed bottom plate (31) through a dovetail groove, the notches (32) are a pair of arc-shaped notches, and the contact wheel body at the connecting line position of the axes of the four contact wheels and the center of the through hole (10) is exposed.

6. The multi-dimensional ultrasonic vibration-assisted assembly island of the knurled assembled camshaft according to claim 1, wherein a piston support (61) is arranged on the press-fitting platform (4) between the press-fitting platform (4) and the top frame base (11), a fixed end of a thrust piston (6) is fixedly installed on the top frame base (11), a movable end of the thrust piston (6) is connected to the piston support (61), and the thrust piston (6) is used for pushing and resetting the press-fitting platform (4); the thrust piston (6) is a hydraulic piston;

the hydraulic damping thimble (9) is also a hydraulic piston, and a conical thimble is arranged at the end part of the movable end of the hydraulic damping thimble (9).

7. The multi-dimensional ultrasonic vibration-assisted assembly island of a knurled assembled camshaft according to claim 1, wherein the locking mechanism (8) comprises an ejector pin inner core (801) and an ejector pin outer sleeve (802), one end of the ejector pin inner core (801) is fixedly mounted on the longitudinal torsion amplitude transformer (701), an accommodating groove for accommodating a camshaft tube is formed in the center of the end face of the ejector pin inner core (801) matched with the hydraulic damping ejector pin (9), a positioning ejector pin (804) is arranged at the bottom of the accommodating groove, the inner wall surface of the accommodating groove is an annular tapered inner wall surface, and the inclination angle of the annular tapered inner wall surface is gradually increased from the notch of the accommodating groove to the bottom of the accommodating groove;

the thimble outer sleeve (802) is sleeved and fixed on the outer side of a positioning thimble (804) accommodating groove in a meshing manner through a spiral groove, an annular U-shaped sleeve matched with the annular tapered inner wall surface is arranged on the inner wall of the thimble outer sleeve (802), a positioning pin (803) used for clamping and positioning a camshaft tube is arranged on the annular sleeve wall of the annular U-shaped sleeve between the annular U-shaped sleeve and the annular tapered inner wall surface, one end of the camshaft tube is screwed after entering the accommodating groove, the annular U-shaped sleeve is screwed, and the annular tapered inner wall surface ejects the positioning pin (803), so that the rapid fastening center of the camshaft tube is realized;

the positioning pins (803) are arranged in at least two pairs in the circumferential direction of the annular sleeve wall of the annular U-shaped sleeve.

8. The multi-dimensional ultrasonic vibration-assisted assembly island of the knurled assembled camshaft according to claim 1, wherein a spiral groove is formed on the longitudinal torsion-converting amplitude rod (701) to convert the longitudinal vibration generated by the ultrasonic transducer (703) into a composite vibration of longitudinal vibration and torsion of the end of the longitudinal torsion-converting amplitude rod (701);

the longitudinal torsion amplitude transformer (701) and the thimble inner core (801) are integrally arranged to ensure the consistency of ultrasonic vibration modes.

9. The multi-dimensional ultrasonic vibration-assisted assembly island of a knurled assembled camshaft according to any one of claims 1 to 8, wherein the initial assembly clearance of the knurled assembly of the cam and the camshaft tube is: 0.05-0.15mm, after the knurling assembly is finished, the interference magnitude of the cam shaft tube and the cam is as follows: 0.15-0.30mm.

Images