Assembly tool for crankshaft chain wheel

Abstract

The invention relates to the field of engine assembly, in particular to a crankshaft chain wheel assembly tool which comprises a fixing sleeve, a jacking part, an axial limiting assembly and a radial limiting assembly. The jacking piece is connected with the fixing sleeve through threads, and the axial limiting assembly is arranged in the fixing sleeve; the radial limiting assembly is slidably installed on the outer ring of the fixing sleeve. According to the crankshaft chain wheel assembling device, the assembling coaxiality of a crankshaft chain wheel is improved and the chain wheel cannot be damaged by using a thread transmission press-fitting mode, and meanwhile, the assembling precision is improved by arranging the axial limiting assembly and the radial limiting assembly; the problems that a chain wheel is damaged and the assembly precision is affected due to the fact that a knocking installation mode is adopted by a traditional tool during manual installation are solved.

Description

Technical Field

[0001] The invention relates to the field of engine assembly, and in particular to an assembly tool for a crankshaft sprocket. Background Art

[0002] The crankshaft sprocket is a wheel with cogs that meshes tightly with the block on the chain ring or cable to effectively transmit motion. It is widely used in internal combustion engines, diesel engines and other equipment, and is an important part of the engine valve system. On large-scale, highly automated production lines, machines are usually used to directly install crankshafts and sprockets. This installation method can greatly improve assembly efficiency and accuracy, but the cost is too high. In small-scale production, tooling is usually used for manual installation. The manual installation method of tooling requires higher skills of workers, but it is more flexible and can adapt to different assembly needs.

[0003] When performing small-batch installation, it is impossible to establish a highly automated production line due to cost issues, so manual trial installation is required. During manual installation, it is necessary to ensure that no timing misalignment occurs when the timing sprocket is assembled on the crankshaft journal end. The prior art has proposed a good solution to this problem, such as a crankshaft sprocket assembly tool with patent number CN102101238A. The tool jacket and guide sleeve are provided to manually connect the tool jacket and the journal end. The guide sleeve cooperates with the inner diameter of the tool jacket, and the crankshaft sprocket is knocked into the crankshaft journal using the guide sleeve. The positioning block is provided to determine whether the timing sprocket is installed in place, thereby improving the accuracy and efficiency of manual installation of the timing sprocket.

[0004] Although the prior art solves the problem of timing misalignment that may occur when manually installing the crankshaft sprocket, the following problems still exist: the sprocket needs to be knocked during assembly of the crankshaft sprocket. This installation method may cause physical damage to the sprocket and crankshaft due to improper force or inaccurate operation, such as cracks and deformation, which will seriously affect their service life and performance; it may also cause the fitting clearance between the sprocket and the crankshaft to be too large or too small and produce radial deflection, making assembly more difficult. A clearance that is too large may cause the sprocket to be unable to be fixed on the crankshaft, while a clearance that is too small may cause the sprocket to be unable to be installed smoothly during assembly; and there are many steps during installation, and the operation is cumbersome and slow, which may cause the sprocket to rotate and thus be unable to align with the timing mark.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs an assembly tool for a crankshaft sprocket. Summary of the invention

[0006] The present invention provides an assembly tool for a crankshaft sprocket, which solves the problem that traditional tooling needs to be knocked during manual installation, which will damage the sprocket and affect the assembly accuracy. By using a threaded transmission press-fitting method, the coaxiality of the crankshaft sprocket assembly is improved without damaging the sprocket. At the same time, the assembly accuracy is improved by providing an axial limit component and a radial limit component, thereby solving the problem that knocking the sprocket will damage the sprocket and reduce the assembly accuracy.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The sprocket wheel of the embodiment of the present invention is a gear that is connected to the gear of the fixed sleeve by a thread, and the gear ...

[0009] Preferably, the fixed sleeve is composed of two arc-shaped sleeves, which are pressed on the crankshaft by bolt connection; the inner diameter of the arc-shaped sleeve is larger than the outer diameter of the sprocket, the left end of the inner wall of the arc-shaped sleeve is provided with an internal thread section, and the right end is provided with a fixed pressure ring; the fixed pressure ring includes a fixed outer shell and a rubber pressure ring, the inner diameter of the fixed outer shell is equal to the diameter of the right end of the crankshaft, and the material is 45 steel; the inner diameter of the rubber pressure ring is 1 mm smaller than the inner diameter of the fixed outer shell.

[0010] In the above scheme, a fixed pressure ring is provided and divided into a fixed shell and a rubber pressure ring. The rubber pressure ring is used to press on the crankshaft to increase friction. The fixed shell is also pressed on the crankshaft, and the fixed shell is used to support the rubber pressure ring to keep its shape unchanged during the sprocket installation, thereby ensuring that the fixed sleeve will not move axially on the crankshaft, thereby improving the assembly accuracy. The inner diameter of the rubber pressure ring is set to be 1mm smaller than the inner diameter of the fixed shell. It can be ensured that after the rubber pressure ring presses the crankshaft, sufficient friction is guaranteed, and it can be retracted into the fixed shell. Its inner diameter is the same as the inner diameter of the fixed shell, and due to the properties of the rubber itself, the rubber pressure ring is not easy to cause damage to the crankshaft when axial slip occurs. The fixed shell uses 45 steel, and after being pressed, it is not easy to have axial displacement with the crankshaft due to its own high hardness and high strength.

[0011] Preferably, the pressing member includes an external thread section, a pressing end and a handle, the external thread section cooperates with the internal thread section; the pressing end includes a limiting pressing end and a sprocket pressing end, the limiting pressing end has an outer diameter smaller than the thread root diameter of the external thread section, and an inner diameter larger than the outer diameter of the sprocket; the sprocket pressing end cooperates with the sprocket hub; the handle is arranged on the left side of the external thread section.

[0012] In the above scheme, by setting the external thread section and the internal thread section to cooperate with each other, the sprocket is pressed by thread transmission, which can save labor and is not easy to damage the sprocket compared with the hammering installation method. The sprocket needs to be preheated before installation and installed after preheating. Since the clamping force is large when the fixed sleeve is pressed against the crankshaft, the force generated by the rotation of the thread will not cause the fixed sleeve to rotate; and the thread pressing can better control the pressing speed and improve the assembly effect; the outer diameter of the limiting pressing end is smaller than the thread root diameter of the external thread section, and the inner diameter is larger than the outer diameter of the sprocket. On the one hand, it is convenient to insert the pressing piece into the fixed sleeve and place the sprocket in the pressing piece. The sprocket pressing end cooperates with the sprocket hub. During pressing, the sprocket pressing section can rotate without causing wear on the sprocket surface; the coaxiality of the sprocket and the crankshaft during assembly is improved to prevent the sprocket from offset.

[0013] Preferably, the horizontal sliding component includes an axial limit slide groove, a coaxial slider, and a return spring; the axial limit slide groove is horizontally symmetrically arranged in the fixing sleeve; the coaxial slider is slidably installed in the axial limit slide groove; one end of the return spring is connected to the tail end of the axial limit slide groove, and the other end is connected to the coaxial slide groove; the vertical sliding component includes a vertical slide groove, a compression block and a compression spring; the vertical slide groove is vertically symmetrically arranged at the upper and lower ends of the axial limit slide groove; the compression block is vertically slidably installed in the vertical slide groove; the clamping component includes a transverse slide groove, a transverse push block, a transverse spring and an axial limit ring; the transverse slide groove is arranged on the right side of the vertical slide groove; the transverse push block is slidably installed in the transverse slide groove; one end of the transverse spring is connected to the transverse push block, and the other end is connected to the right end of the transverse slide groove; the axial limit ring is slidably installed in the transverse slide groove.

[0014] In the above scheme, the sprocket presses the coaxial slider to drive the vertical sliding component to work, and the vertical sliding component drives the clamping component. When the sprocket reaches the predetermined installation position, the sprocket is limited by the axial limit ring to prevent the sprocket from continuing to be pressed.

[0015] Preferably, the coaxial slider includes a fixed end and a sliding end, the inner ring of the fixed end is an arc-shaped structure, the radius of curvature of which is equal to the radius of the sprocket, and a stop block is arranged on the right side of the fixed end; the sliding end is slidably installed in the axial limiting groove, and the upper and lower parts of the right side are provided with driving inclined surfaces.

[0016] In the above scheme, the inner ring of the fixed end of the coaxial slider is set to an arc-shaped structure, and its curvature radius is equal to the sprocket radius, so that the inner ring fits with the outer ring of the sprocket, thereby ensuring the coaxiality of the sprocket and the crankshaft; a stop block is set on the right side of the fixed end, so that the sprocket can push the coaxial slider to move, thereby driving the axial limit assembly to work.

[0017] Preferably, the compression block is provided with a compression inclined surface matched with the driving inclined surface at the left end facing the axial limit slide groove, and a transverse push inclined surface is provided at the right end facing the compression spring. The transverse push block is provided with a transverse pressure inclined surface matched with the transverse push inclined surface at the center side of the axial limit slide groove, and a push inclined surface is provided at the right end facing the center side of the fixed sleeve.

[0018] In the above solution, the whole structure is driven to work by the inclined surfaces pressing each other, without the need for an additional driving device, thus saving costs, and the structure is simple and easy to implement.

[0019] Preferably, the axial limit ring includes a limit pressure ring and a clamping push rod, the inner diameter of the limit pressure ring is equal to the diameter of the crankshaft mounting section, and the inner diameter surface is made of rubber material; the clamping push rod is slidably installed in the transverse slide groove, and the clamping push rod is provided with a clamping slope matching the pushing slope at one end facing the outer side of the fixed sleeve; the angles of the driving slope, compression slope, transverse push slope, transverse pressure slope, pushing slope and clamping slope are all set to 45 degrees.

[0020] In the above scheme, by setting all the inclined surfaces to 45 degrees, on the one hand, it is convenient for processing, and on the other hand, 45 degrees can decompose the thrust into the horizontal and vertical directions equally, so that the axial limit assembly has a higher transmission efficiency when working; when the sprocket reaches the predetermined installation position, the clamping push rod is pushed by the lateral push block, and the drive limit pressure ring is pressed on the crankshaft surface to prevent excessive press-fitting from causing the fixed sleeve to slip, thereby exceeding the predetermined installation position. At the same time, when it is observed that the predetermined installation position is reached, the top pressure piece can continue to be turned, and the axial limit is used to ensure that the installation position is fully reached and does not exceed the predetermined installation position.

[0021] Preferably, the radial limiting assembly includes a radial limiting slot and a radial limiting slider, the radial limiting slot is horizontally opened on the vertical surface of the arc sleeve, and the radial limiting slider is slidably installed in the radial limiting slot. The radial limiting slider includes a clamping end and a limiting end, the clamping end is a U-shaped structure, and the limiting end can be engaged with the sprocket.

[0022] In the above scheme, the clamping end is set to a U-shaped structure. When the arc sleeve is clamped, the structure can be clamped in the radial limit slide groove and can slide axially under the push of the top pressure piece. When it is not pushed by the top pressure piece, the radial limit slider is not easy to slide axially due to the clamping force, thereby continuously limiting the sprocket; the limiting end and the sprocket can be meshed to ensure that the sprocket will not rotate, so that the sprocket is aligned with the timing mark when installed.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The existing crankshaft sprocket assembly tool uses a guide sleeve to knock the sprocket onto the crankshaft, which will damage the sprocket and reduce the coaxiality of the sprocket and crankshaft assembly. The present invention uses threaded transmission to install the sprocket, which will not damage the sprocket itself, but also improve the coaxiality of the sprocket and crankshaft assembly. On the other hand, it is convenient to control the installation speed of the sprocket and crankshaft, thereby ensuring the installation effect. The operation process is simple, and the installation can be completed by only twisting the top pressure piece, which reduces the technical requirements for workers to install.

[0025] 2. The present invention sets a radial limit assembly. On the one hand, the radial limit slider is engaged with the sprocket to ensure that the sprocket is always aligned with the timing mark during installation; on the other hand, the radial limit slider is pushed by the pressing part during installation and can slide axially. When it is not pushed by the pressing part, the radial limit slider will not slide axially due to the clamping force, thereby continuously limiting the sprocket; thereby improving the installation accuracy.

[0026] 3. The present invention sets an axial limit assembly so that when the sprocket is pressed, the horizontal sliding member is driven to move, thereby driving the vertical sliding member to slide vertically, so that after the sprocket reaches the predetermined installation position, the axial limit ring is pressed against the crankshaft, so that after the sprocket reaches the predetermined installation position, it is axially limited and will not exceed the installation position; at the same time, the top pressure piece sprocket continues to be turned to press the horizontal sliding member, which will make the axial limit ring press tighter on the crankshaft and prevent the fixed sleeve from moving on the crankshaft, thereby ensuring the axial limit while the sprocket can be installed in place, thereby improving the installation accuracy and installation effect of the sprocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 An exploded view of the present invention;

[0029] Figure 2 It is a schematic diagram of the internal structure of the fixing sleeve of the present invention;

[0030] Figure 3 It is a schematic diagram of the fixed pressure ring structure of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the top pressure piece of the present invention;

[0032] Figure 5 It is a cross-sectional view of the internal structure of the top pressing member of the present invention;

[0033] Figure 6 It is a schematic diagram of the arc-shaped sleeve and the internal structure of the present invention;

[0034] Figure 7 It is a cross-sectional view of the internal structure of the fixing sleeve of the present invention;

[0035] Figure 8 It is a schematic diagram of the coaxial slider structure of the present invention;

[0036] Fig. 9 It is a schematic diagram of the structure of the axial limit assembly of the present invention;

[0037] In the figure: a, crankshaft; b, sprocket; 1, fixed sleeve; 11, arc sleeve; 111, internal thread section; 112, fixed pressure ring; 1121, fixed shell; 1122, rubber pressure ring; 113, fixed block; 2, top pressure piece; 21, external thread section; 22, top pressure end; 221, limit top pressure end; 222, sprocket top pressure end; 2221, rotating ball; 2222, rotating ring; 2223, rotating groove; 23, handle; 3, axial limit assembly; 31, horizontal sliding member; 311, axial limit slide groove; 312, coaxial slider; 3121, fixed end; 31211, stopper; 3122, sliding end; 312 21. Driving inclined plane; 313. Return spring; 32. Vertical sliding member; 321. Vertical slide groove; 322. Compression block; 3221. Compression inclined plane; 3222. Horizontal push inclined plane; 323. Compression spring; 33. Pressing member; 331. Horizontal slide groove; 332. Horizontal push block; 3321. Horizontal pressure inclined plane; 3322. Pushing inclined plane; 333. Horizontal spring; 334. Axial limiting ring; 3341. Limiting pressure ring; 3342. Pressing push rod; 33421. Pressing inclined plane; 4. Radial limiting assembly; 41. Radial limiting slide groove; 42. Radial limiting slider; 421. Pressing end; 422. Limiting end. DETAILED DESCRIPTION

[0038] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] See also Figures 1 to 9 The present invention provides an assembly tool for a crankshaft sprocket, and the technical solution is as follows:

[0040] As a specific embodiment of the present invention, refer to Figure 1 and Figure 2 , an assembly tool for a crankshaft sprocket, comprising a fixed sleeve 1, a pressing piece 2, an axial limiting assembly 3 and a radial limiting assembly 4, wherein the fixed sleeve 1 is pressed and installed on the crankshaft a; the pressing piece 2 is connected to the fixed sleeve 1 by a thread, and the pressing piece 2 drives the sprocket b to slide on the crankshaft a through thread transmission; the axial limiting assembly 3 comprises a horizontal sliding member 31, a vertical sliding member 32 and a pressing member 33; the horizontal sliding member 31 is horizontally slidably installed inside the fixed sleeve 1, and the vertical sliding member 32 is vertically slidably installed inside the fixed sleeve 1; the pressing member 33 is slidably installed inside the fixed sleeve 1, and the sprocket b drives the horizontal sliding member 31 to push the vertical sliding member 32 to slide vertically, and the vertical sliding member 32 drives the pressing member 33 to be pressed on the crankshaft a and axially limit the sprocket b; the radial limiting assembly 4 is slidably installed on the outer ring of the fixed sleeve 1, and slides with the sprocket b under the drive of the pressing piece 2, and radially limits the movement of the sprocket b on the crankshaft a, thereby limiting the rotation of the sprocket b.

[0041] As a specific embodiment of the present invention, refer to Figure 2 and Figure 3The fixing sleeve 1 is composed of two arc sleeves 11, which are connected and pressed on the crankshaft a by bolts. The fixing sleeve 1 is disassembled into two parts, and the fixing block 113 is used for bolt connection to press the two arc sleeves 11 on the crankshaft a. The clamping force between the two arc sleeves 11 and the crankshaft a is improved by bolt connection, so as to ensure that there is no axial movement between the fixing sleeve 1 and the crankshaft a when the sprocket b is pressed, and the assembly accuracy of the sprocket b is ensured. At the same time, the state of the sprocket b during assembly can be directly observed through the gap between the two arc sleeves 11. When an assembly error occurs, it can be adjusted in time, and it can be observed whether the sprocket b is installed to the predetermined installation position; the inner diameter of the arc sleeve 11 is larger than the outer diameter of the sprocket b, and the left end of the inner wall of the arc sleeve 11 is provided with an internal thread section 111, and the right end is provided with a fixed pressure ring 112; the fixed pressure ring 112 includes a fixed shell 1121 and a rubber pressure ring 1122, and the fixed shell 11 The inner diameter of 21 is equal to the diameter of the right end of the crankshaft a, and the material is 45 steel; the inner diameter of the rubber pressure ring 1122 is 1mm smaller than the inner diameter of the fixed shell 1121; the rubber pressure ring 1122 is used to press on the crankshaft a to increase the friction force, and the fixed shell 1121 is also pressed on the crankshaft a, and the rubber pressure ring 1122 is supported by the fixed shell 1121 to keep its shape unchanged when the sprocket b is installed, thereby ensuring that the fixed sleeve 1 will not move axially on the crankshaft a, thereby improving the assembly accuracy, and setting the inner diameter of the rubber pressure ring 1122 to be 1mm smaller than the inner diameter of the fixed shell 1121 can ensure that after the rubber pressure ring 1122 is pressed against the crankshaft a, it can provide sufficient friction force and can shrink into the fixed shell 1121, so that its inner diameter after pressing is the same as the inner diameter of the fixed shell 1121, and due to the properties of the rubber itself, when axial slippage occurs due to installation errors, the rubber pressure ring 1122 is not easy to cause damage to the crankshaft a. The fixed housing 1121 is made of 45 steel, which is not easy to be axially offset from the crankshaft a after being pressed due to its own high hardness and high strength.

[0042] As a specific embodiment of the present invention, refer to Figure 4The pressing member 2 includes an external thread section 21, a pressing end 22 and a handle 23, and the external thread section 21 cooperates with the internal thread section 111; by setting the external thread section 21 to cooperate with the internal thread section 111, the sprocket b is pressed by thread transmission, which is more labor-saving than the method of knocking and direct pressing. At the same time, compared with the method of knocking and installation, the thread transmission pressing method is not easy to cause damage to the sprocket b; and the thread transmission pressing can better control the pressing speed and improve the assembly effect; the pressing end 22 includes a limiting pressing end 221 and a sprocket pressing end 222, the outer diameter of the limiting pressing end 221 is smaller than the thread root diameter of the external thread section 21, and the inner diameter is larger than the outer diameter of the sprocket b; the sprocket pressing end 222 includes a rotating bead 2221, a rotating ring 2222 and a rotating groove 2223, the rotating groove 2223 is opened in the interior of the pressing member 2, and the rotating bead 2221 and the rotating ring 2 The sprocket wheel 222 is rotatably installed in the rotating groove 2223. During the press-fitting, the sprocket pressing section 222 can rotate without causing wear on the surface of the sprocket wheel b. On the one hand, it is convenient to insert the pressing piece 2 into the fixed sleeve 1 and place the sprocket wheel b in the pressing piece 2. The sprocket pressing end 222 cooperates with the sprocket hub to improve the coaxiality of the sprocket wheel b and the crankshaft a during assembly and prevent the sprocket wheel from shifting. The handle 23 is set on the left side of the external threaded section 21. By setting the handle 23, the length of the handle 23 is set to a length that is convenient for twisting. By increasing the force arm, it is more time-saving and labor-saving to twist the pressing piece 2 during installation. At the same time, there is no need to use a wrench, which enhances the practicality of the tooling itself. The sprocket wheel b needs to be preheated before installation and installed after preheating. Since the clamping force is large when the fixed sleeve 1 presses the crankshaft a, the force generated by the rotation of the thread will not cause the fixed sleeve 1 to rotate.

[0043] As a specific embodiment of the present invention, refer to Figure 6 and Figure 7The horizontal sliding member 31 includes an axial limiting sliding groove 311, a coaxial slider 312, and a return spring 313; the axial limiting sliding groove 311 is horizontally symmetrically opened in the fixing sleeve 1; the coaxial slider 312 is slidably installed in the axial limiting sliding groove 311; one end of the return spring 313 is connected to the tail end of the axial limiting sliding groove 311, and the other end is connected to the coaxial slider 312; the vertical sliding member 32 includes a vertical sliding groove 321, a compression block 322 and a compression spring 323; the vertical sliding groove 321 is vertically symmetrically opened at the upper and lower ends of the axial limiting sliding groove 311; the compression block 322 is vertically slidably installed in the vertical sliding groove 321; the pressing member 33 includes a horizontal sliding groove 331, A transverse push block 332, a transverse spring 333 and an axial limit ring 334; the transverse slide groove 331 is opened on the right side of the vertical slide groove 321; the transverse push block 332 is slidably installed in the transverse slide groove 331; one end of the transverse spring 333 is connected to the transverse push block 332, and the other end is connected to the right end of the transverse slide groove 331; the axial limit ring 334 is slidably installed in the transverse slide groove 331; the coaxial slider 312 is pressed by the sprocket b, so that the coaxial slider 312 drives the vertical sliding member 32 to work, and the vertical sliding member 32 is used to drive the clamping member 33. When the sprocket b reaches the predetermined installation position, the sprocket b is limited by the axial limit ring 334 to prevent the sprocket b from continuing to be pressed.

[0044] As a specific embodiment of the present invention, refer to Figure 8 The coaxial slider 312 includes a fixed end 3121 and a sliding end 3122. The inner ring of the fixed end 3121 is an arc-shaped structure, and its curvature radius is equal to the radius of the sprocket b. A stopper 31211 is arranged on the right side of the fixed end 3121; the sliding end 3122 is slidably installed in the axial limiting slide groove 311, and the upper and lower parts of the right side thereof are provided with driving inclined surfaces 31221; the fixed end 3121 of the coaxial slider 312 is arranged to have an inner ring with an arc-shaped structure, and its curvature radius is equal to the radius of the sprocket b, so that its inner ring fits with the outer ring of the sprocket b, thereby ensuring the coaxiality of the sprocket b and the crankshaft a; a stopper 31211 is arranged on the right side of the fixed end 3121, which can make the sprocket b push the coaxial slider 312 to move, so that the sprocket b and the coaxial slider 312 move synchronously, thereby driving the axial limiting assembly 3 to work and improving the axial positioning accuracy during installation.

[0045] As a specific embodiment of the present invention, refer to Figure 7 , Figure 8 and Fig. 9The compression block 322 is provided with a compression inclined surface 3221 matched with the driving inclined surface 31221 at the left end facing the axial limiting slide groove 311, and a horizontal push inclined surface 3222 is provided at the right end facing the compression spring 323. The horizontal push block 332 is provided with a horizontal pressure inclined surface 3321 matched with the horizontal push inclined surface 3222 at the center side of the axial limiting slide groove 311, and a push inclined surface 3322 is provided at the right end facing the center side of the fixed sleeve 1. The axial limit ring 334 includes a limit pressure ring 3341 and a clamping push rod 3342. The inner diameter of the limit pressure ring 3341 is equal to the diameter of the crankshaft a mounting section, and the inner diameter surface is made of rubber; the clamping push rod 3342 is slidably installed in the horizontal slide groove 331, and the clamping push rod 3342 is provided with a clamping inclined surface 33421 matching the pushing inclined surface 3322 at one end facing the outer side of the fixed sleeve 1; the angles of the driving inclined surface 31221, the compression inclined surface 3221, the horizontal pushing inclined surface 3222, the horizontal pressing inclined surface 3321, the pushing inclined surface 3322 and the clamping inclined surface 33421 are all set to 45 degrees; the overall structure is driven to work by setting the inclined surfaces to press each other, without the need to add an additional driving device, saving costs, and the structure is simple and easy to implement; by setting all the inclined surfaces to 45 degrees, on the one hand, it is convenient to process and improve the feasibility, and on the other hand, setting it to 45 degrees can decompose the thrust to The horizontal and vertical directions are equal, so that the transmission efficiency of the axial limit assembly 3 is higher when working; when the sprocket b reaches the predetermined installation position, the clamping push rod 3342 is pushed by the lateral push block 332, and the driving limit pressure ring 3341 is pressed on the surface of the crankshaft a to prevent excessive pressing and causing the fixed sleeve 1 to slip, thereby exceeding the predetermined installation position. At the same time, when it is observed that the predetermined installation position is reached, the top pressure piece 2 can be slightly twisted to ensure that the installation position is fully reached and does not exceed the predetermined installation position through axial limitation, and the assembly effect can be improved, and the reliability of the connection between the sprocket b and the crankshaft a can be improved; the distance from the vertical surface of the fixed shell 1121 facing the outside of the fixed sleeve 1 to the vertical surface of the limit pressure ring 3341 facing the top pressure piece 2 is 3 cm, and the fixed sleeve 1 can be installed according to the predetermined installation position, so that the axial limit position and the predetermined installation position coincide, thereby improving the axial positioning accuracy during installation.

[0046] As a specific embodiment of the present invention, refer to Fig. 9The radial limiting assembly 4 includes a radial limiting slot 41 and a radial limiting slider 42. The radial limiting slot 41 is horizontally opened on the vertical surface of the arc sleeve 11, and the radial limiting slider 42 is slidably installed in the radial limiting slot 41. The length of the radial limiting slot 41 must be such that when the sprocket b reaches the predetermined installation position, the radial limiting slider 42 can reach the tail of the radial limiting slot 41. The radial limiting slider 42 includes a clamping end 421 and a limiting end 422. The clamping end 421 is a U-shaped structure. The clamping end 421 is set to a U-shaped structure. When the arc sleeve 11 is clamped, the structure can be compressed in the radial limiting slot 41 by elastic deformation, and can slide axially under the push of the top pressure piece 2. When it is not pressed by the top pressure piece, 2 When pushed, due to the pressing force, the radial limiting slider 42 is not easy to slide axially, thereby continuously limiting the sprocket b; the limiting end 422 can mesh with the sprocket b, and the limiting end 422 can mesh with the sprocket b to ensure that the sprocket b does not rotate, so that the sprocket b is aligned with the timing mark during installation, thereby improving the installation accuracy; the radial limiting component 4 has a simple structure and is easy to install, and its limiting effect is good, and it can continuously limit the position during the press-fitting process, reducing the cost and improving the feasibility.

[0047] Working process: according to the predetermined installation position, fix the fixed sleeve 1 on the crankshaft a, and install the radial limit slider 42 into the radial limit slot 41, put the heated sprocket b into the top pressure piece 2, and after the tooth gap of the sprocket b is aligned with the radial limit slider 42, screw the top pressure piece 2 into the fixed sleeve 1, screw the top pressure piece 2, and after screwing it to the predetermined installation position, the axial limit assembly 3 is radially axially limited. After the installation is completed, remove the fixed sleeve 1.

[0048] Specifically, the axial limit ring 334 is installed in the transverse slide groove 331. According to the predetermined installation position of the sprocket b, the outer vertical surface of the fixed shell 1121 at the tail of the fixed sleeve 1 is aligned with the distance of 3 cm from the predetermined installation position. The gap between the two arc sleeves 11 is aligned with the mark when rotating. After the radial limit slider 42 is placed in the radial limit slide groove 41, the fixing blocks 113 on the two arc sleeves 11 are connected with bolts so that the fixed sleeve 1 is completely pressed on the crankshaft a without axial movement. The preheated sprocket b is placed in the top pressure piece 2 so that the hub of the sprocket b is aligned with the top pressure piece. 2, align the tooth gap of sprocket b with the radial limiting slider 42 and install it into the fixing sleeve 1, push the pressing piece 2, when the external thread section 21 of the pressing piece 2 contacts the internal thread section 111 of the fixing sleeve 1, turn the handle 23 to make the sprocket pressing end 222 of the pressing piece 2 push the sprocket b to install, the limiting pressing end 221 of the pressing piece 2 pushes the radial limiting slider 42 to slide with the sprocket b, and continuously limits the rotation of the sprocket b; when the sprocket b contacts the coaxial slider 312, the coaxial slider 312 fine-tunes the sprocket b to improve the sprocket b The coaxiality with crankshaft a is ensured. When the tail of sprocket b contacts the stopper 31211, the coaxial slider 312 is pushed to slide in the axial limit slot 311. When the driving inclined surface 31221 of the coaxial slider 312 contacts the compression inclined surface 3221 of the compression block 322, the compression spring 323 is pressed to push the compression block 322 to retract into the vertical slot 321. At the same time, the transverse push inclined surface 3222 of the compression block 322 contacts the transverse pressure inclined surface 3321 of the transverse push block 332, so that the transverse push block 332 compresses the transverse spring 333 and the transverse slot 331 is closed. The sprocket 33 is then pushed down and the locking cam 3322 is turned to lock the sprocket b in the locking position.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An assembly tool for a crankshaft sprocket, characterized in that: The invention comprises a fixing sleeve (1), a pressing piece (2), an axial limiting assembly (3) and a radial limiting assembly (4); the fixing sleeve (1) is pressed and mounted on a crankshaft (a); the pressing piece (2) is connected to the fixing sleeve (1) via a thread, and the pressing piece (2) drives a sprocket (b) to slide on the crankshaft (a) via a threaded transmission; the axial limiting assembly (3) comprises a horizontal sliding member (31), a vertical sliding member (32) and a pressing member (33); the horizontal sliding member (31) is horizontally slidably mounted inside the fixing sleeve (1), and the vertical sliding member (32) is vertically slidably mounted inside the fixing sleeve (1). The fixing sleeve (1) is movably mounted inside the fixing sleeve (1); the pressing member (33) is slidably mounted inside the fixing sleeve (1); the sprocket (b) drives the horizontal sliding member (31) to push the vertical sliding member (32) to slide vertically; the vertical sliding member (32) drives the pressing member (33) to press on the crankshaft (a) and axially limit the sprocket (b); the radial limiting component (4) is slidably mounted on the outer ring of the fixing sleeve (1), slides with the sprocket (b) under the drive of the top pressure member (2), and radially limits the movement of the sprocket (b) on the crankshaft (a), thereby limiting the rotation of the sprocket (b).

2. The crankshaft sprocket assembly tool according to claim 1, characterized in that: The fixed sleeve (1) is composed of two arc-shaped sleeves (11) and is pressed on the crankshaft (a) by bolt connection; the inner diameter of the arc-shaped sleeve (11) is larger than the outer diameter of the sprocket (b); the left end of the inner wall of the arc-shaped sleeve (11) is provided with an internal thread section (111), and the right end is provided with a fixed pressure ring (112); the fixed pressure ring (112) comprises a fixed outer shell (1121) and a rubber pressure ring (1122); the inner diameter of the fixed outer shell (1121) is equal to the diameter of the right end of the crankshaft (a), and the material is 45 steel; the inner diameter of the rubber pressure ring (1122) is 1 mm smaller than the inner diameter of the fixed outer shell (1121).

3. The crankshaft sprocket assembly tool according to claim 2, characterized in that: The pressing member (2) comprises an external thread section (21), a pressing end (22) and a handle (23); the external thread section (21) cooperates with the internal thread section (111); the pressing end (22) comprises a limiting pressing end (221) and a sprocket pressing end (222); the limiting pressing end (221) has an outer diameter smaller than the thread root diameter of the external thread section (21), and an inner diameter larger than the outer diameter of the sprocket (b); the sprocket pressing end (222) is rotatably mounted inside the pressing member (2) and cooperates with the hub of the sprocket (b); the handle (23) is arranged on the left side of the external thread section (21).

4. The crankshaft sprocket assembly tool according to claim 1, characterized in that: The horizontal sliding member (31) comprises an axial limiting sliding groove (311), a coaxial sliding block (312), and a return spring (313); the axial limiting sliding groove (311) is horizontally symmetrically arranged in the fixing sleeve (1); the coaxial sliding block (312) is slidably installed in the axial limiting sliding groove (311); one end of the return spring (313) is connected to the tail end of the axial limiting sliding groove (311), and the other end is connected to the coaxial sliding block (312); the vertical sliding member (32) comprises a vertical sliding groove (321), a compression block (322) and a compression spring (323); the vertical sliding groove (321) is vertically symmetrically arranged in the axial limiting sliding groove (311); the coaxial sliding block (312) is slidably installed in the axial limiting sliding groove (311); one end of the return spring (313) is connected to the tail end of the axial limiting sliding groove (311), and the other end is connected to the coaxial sliding block (312); The compression block (322) is vertically slidably installed in the vertical slide groove (321); the clamping member (33) includes a transverse slide groove (331), a transverse push block (332), a transverse spring (333) and an axial limit ring (334); the transverse slide groove (331) is opened on the right side of the vertical slide groove (321); the transverse push block (332) is slidably installed in the transverse slide groove (331); one end of the transverse spring (333) is connected to the transverse push block (332), and the other end is connected to the right end of the transverse slide groove (331); the axial limit ring (334) is slidably installed in the transverse slide groove (331).

5. The crankshaft sprocket assembly tool according to claim 4, characterized in that: The coaxial slider (312) comprises a fixed end (3121) and a sliding end (3122); the inner circle of the fixed end (3121) is an arc-shaped structure, the radius of curvature of which is equal to the radius of the sprocket (b); a stopper (31211) is arranged on the right side of the fixed end (3121); the sliding end (3122) is slidably installed in the axial limiting sliding groove (311), and the upper and lower parts of the right side thereof are both provided with driving inclined surfaces (31221).

6. The crankshaft sprocket assembly tool according to claim 5, characterized in that: The compression block (322) is provided with a compression inclined surface (3221) matched with the driving inclined surface (31221) at its left end facing the axial limiting sliding groove (311), and a transverse pushing inclined surface (3222) is provided at its right end facing the compression spring (323).

7. The crankshaft sprocket assembly tool according to claim 6, characterized in that: The lateral push block (332) is provided with a lateral pressure inclined surface (3321) matched with the lateral push inclined surface (3222) on the side facing the center of the axial limit sliding groove (311), and the lateral push block (332) is provided with a pushing inclined surface (3322) on the right end facing the center of the fixed sleeve (1).

8. The crankshaft sprocket assembly tool according to claim 7, characterized in that: The axial limiting ring (334) comprises a limiting pressure ring (3341) and a clamping push rod (3342); the inner diameter of the limiting pressure ring (3341) is equal to the diameter of the mounting section of the crankshaft (a), and the inner diameter surface is made of rubber; the clamping push rod (3342) is slidably mounted in the transverse slide groove (331), and the end of the clamping push rod (3342) facing the outer side of the fixed sleeve (1) is provided with a clamping inclined surface (33421) matched with the pushing inclined surface (3322); the angles of the driving inclined surface (31221), the compression inclined surface (3221), the transverse pushing inclined surface (3222), the transverse pressing inclined surface (3321), the pushing inclined surface (3322) and the clamping inclined surface (33421) are all set to 45 degrees.

9. The crankshaft sprocket assembly tool according to claim 2, characterized in that: The radial limiting assembly (4) comprises a radial limiting slot (41) and a radial limiting slider (42); the radial limiting slot (41) is horizontally opened on a vertical surface of the arc-shaped sleeve (11); and the radial limiting slider (42) is slidably installed in the radial limiting slot (41).

10. The crankshaft sprocket assembly tool according to claim 9, characterized in that: The radial limiting sliding block (42) comprises a clamping end (421) and a limiting end (422); the clamping end (421) is a U-shaped structure; and the limiting end (422) can be engaged with the sprocket (b).

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