Engine crankshaft assembly assembling and press-fitting die frame

Abstract

In order to solve the problems that according to an engine crankshaft assembly assembling and press-fitting method in the prior art, shaking or jerking may occur in the press-fitting process, position or size deviation may occur to a crankshaft assembly, the press-fitting quality of the crankshaft assembly is difficult to guarantee and the like, the utility model provides an engine crankshaft assembly assembling and press-fitting die frame which comprises a die frame body, the device comprises a bottom plate, a die column, a sliding plate, a connecting column, a connecting plate, a lower crank positioning mechanism, a connecting rod positioning seat, an upper crank positioning mechanism and an upper crank fixing mechanism, the lower crank positioning mechanism and the upper crank positioning mechanism are the same in structure and opposite in orientation, and each crank positioning mechanism comprises a base, a positioning seat, a guide shaft, a spring and an anti-falling bolt; the connecting rod positioning seat is a cuboid, and a connecting rod positioning column is arranged on the surface of the cuboid connecting rod positioning seat; the upper crank fixing mechanism comprises a supporting plate and a fixing rod. The crankshaft assembly press-fitting device has the advantages that shaking or pause possibly generated in the press-fitting process is eliminated, and position or size deviation possibly occurring in a crankshaft assembly is eliminated.

Description

Technical Field

[0001] The utility model relates to an engine crankshaft assembly press-fitting technology, in particular to an engine crankshaft assembly press-fitting die frame. Background Art

[0002] The engine crankshaft assembly consists of four main parts, namely the left crank, the right crank, the crankshaft and the connecting rod. The left crank and the right crank are roughly the same in shape, both of which include a crank plate and a crankshaft; the crankshaft is set at the center of the crank plate, and a crankshaft through hole is set at the eccentric position of the crank plate. The left crank and the right crank are connected into one body through the crankshaft, and the connecting rod is mounted on the crankshaft, thus forming a crankshaft assembly (see Appendix Figure 1 , in the figure, a is the left crank, b is the right crank, c is the crank shaft, and d is the connecting rod). Usually, the left crank, the right crank and the crank shaft are fixedly connected into one body by using the interference fit between the crank shaft through holes on the left crank and the right crank, and the connecting rod is mounted on the middle section of the crank shaft to form a sliding or rotatable fit.

[0003] The prior art engine crankshaft assembly is usually assembled by a hydraulic press method, that is, the left crank and the crankshaft (the connecting rod is already mounted on the crankshaft) are placed on the hydraulic press work surface in sequence, and the right crank is detachably placed on the bottom surface of the hydraulic press plate. At the same time, the axes of the crankshaft through hole on the left crank, the crankshaft and the crankshaft through hole on the right crank are ensured to be coaxial. The hydraulic press is turned on, and the hydraulic press plate moves downward under the action of the cylinder piston, and finally the two ends of the crankshaft are pressed into the crankshaft through holes of the left crank and the right crank respectively. Since the crankshaft through holes on the left crank and the right crank are interference fit with the crankshaft, the tight and firm connection between the left crank and the right crank and the crankshaft can be ensured after press-fitting. Since the left crank is placed on the work surface during press-fitting, it is also called the lower crank; and the right crank is placed on the bottom surface of the press plate, so it is also called the upper crank. Obviously, during the downward pressing process of the hydraulic press plate, shaking or jerking may occur, causing some position or size deviations in the crankshaft assembly after pressing, making it difficult to ensure the pressing quality of the crankshaft assembly.

[0004] Obviously, the prior art engine crankshaft assembly press-fitting method has problems such as possible shaking or jerking during the press-fitting process, possible position or size deviation of the crankshaft assembly, and difficulty in ensuring the press-fitting quality of the crankshaft assembly. Summary of the invention

[0005] In order to solve the problems existing in the prior art engine crankshaft assembly press-fitting method, such as the possible shaking or stuttering during the press-fitting process, the possible position or size deviation of the crankshaft assembly and the difficulty in ensuring the press-fitting quality of the crankshaft assembly, the utility model proposes an engine crankshaft assembly press-fitting die frame.

[0006] The utility model discloses a press-fit die frame for assembling an engine crankshaft assembly, comprising a bottom plate, a die column, a slide plate, a connecting column, a connecting plate, a lower crank positioning mechanism, a connecting rod positioning seat, an upper crank positioning mechanism and an upper crank fixing mechanism; the bottom plate is rectangular, and fixed through holes are arranged at the four corners of the bottom plate; the die column is a cylinder with a diameter of not less than 50 mm and there are four of them, which are respectively fixed in the four fixed through holes of the bottom plate; the slide plate is rectangular, and sliding through holes are arranged at the four corners of the slide plate, and the slide plate is slidably sleeved on the bottom plate through the sliding through holes. The connecting column is a cylinder, one end of which is fixed to the center of the surface of the slide plate, and the other end is fixed to the center of the bottom surface of the connecting plate; the connecting plate is a rectangle, and notches for fixing the connecting plate to the bottom surface of the hydraulic press plate are arranged at the four corners of the connecting plate; the lower crank positioning mechanism is arranged in the middle of the bottom plate surface; the connecting rod positioning seat is arranged in front of the lower crank positioning mechanism; the upper crank positioning mechanism is arranged in the middle of the bottom surface of the slide plate; the upper crank fixing mechanism is arranged on the bottom surface of the slide plate on the right front side of the upper crank positioning mechanism; wherein,

[0007] The lower crank positioning mechanism and the upper crank positioning mechanism have the same structure and are oriented in opposite directions, and include a base, a positioning seat, a guide shaft, a spring and an anti-slip bolt; the base and the positioning seat are both cylindrical and are installed in an overlapping manner from bottom to top; a crank shaft through hole is provided in the center of the base and the positioning seat, and the diameter of the crank shaft through hole matches the diameter of the crank shaft root; a guide shaft through hole is provided on the radial rear side of the crank shaft through hole, and the diameter of the guide shaft through hole matches the diameter of the crank shaft; the spacing from the crank shaft through hole to the guide shaft through hole is the same as the spacing from the crank shaft on the crank to the crank shaft through hole; an anti-slip screw hole is provided in the radial direction of the crank shaft through hole of the positioning seat; The shaft is a cylinder with steps, the diameter of its large step matches the guide shaft through hole, and an anti-slip groove is opened in the upper half of the large step; the spring is a compression spring and is installed in the guide shaft through hole, its inner diameter matches the diameter of the small step of the guide shaft, and its outer diameter matches the guide shaft through hole; the small step of the guide shaft is inserted downward into the guide shaft through hole, the small step enters the spring inner hole and contacts the spring surface, and the large step extends 5 to 10 mm from the surface of the positioning seat; the anti-slip bolt is screwed into the anti-slip screw hole of the positioning seat, and the front end enters the anti-slip groove of the large step of the guide shaft; and the crank shaft through hole and the guide shaft through hole of the lower crank positioning mechanism and the upper crank positioning mechanism are coaxial;

[0008] The connecting rod positioning seat is a rectangular parallelepiped, and a connecting rod positioning column is arranged on the surface of the rectangular parallelepiped connecting rod positioning seat; the height of the connecting rod positioning seat is the sum of the thickness of the positioning seat of the lower crank positioning mechanism and the thickness of the engine connecting rod; the diameter of the connecting rod positioning column matches the diameter of the through hole at the small end of the connecting rod; the spacing from the connecting rod positioning column to the through hole of the guide shaft of the lower crank positioning mechanism is the same as the spacing from the through hole at the large end of the connecting rod to the through hole at the small end;

[0009] The upper crank fixing mechanism includes a support plate and a fixing rod; the support plate is an L-shaped structure, and the outer end face of the short side of the L-shaped support plate is fixed upward to the bottom surface of the slide plate on the right front side of the upper crank positioning mechanism, and a sliding through hole is provided in the upper and middle part of the long side of the L-shaped support plate; the fixing rod is a long cylinder, which is inserted into the sliding through hole of the support plate, and a flexible column sleeve is provided at the front end and an inverted cone handle is provided at the rear end; the fixing position, height and extension length of the fixing rod are based on the fact that after the fixing rod is extended, the front end of the fixing rod is just engaged with the end face of the upper crank installed in the upper crank fixing mechanism, and after the fixing rod is pulled back, the upper crank can be taken out from the upper crank fixing mechanism.

[0010] Furthermore, a reinforcement sleeve and a reinforcement support plate are provided at the lower part of the mold column; the reinforcement sleeves are cylindrical and there are four of them, which are respectively mounted on the lower part of the four mold columns, and the bottom surface is fixedly connected to the bottom plate; the reinforcement support plates are rectangular and there are two of them, and through holes are provided at the two ends of the reinforcement support plates; the reinforcement support plates are respectively mounted on the middle part of the left and right mold columns in groups of two through the through holes at both ends, that is, directly above the reinforcement sleeves.

[0011] Furthermore, a limiting pad is arranged between the base plate and the slide plate; the limiting pad comprises a lower limiting pad and an upper limiting pad, the lower limiting pad is a polygonal cylinder and there are two of them, which are respectively fixed on the surface of the base plate at the middle inner position between the left and right mold columns in a group of two; the upper limiting pad is a polygonal cylinder and there are two of them, which are respectively fixed on the bottom surface of the slide plate at a position opposite to the lower limiting pad.

[0012] The beneficial technical effect of the engine crankshaft assembly assembly press-fitting die frame of the utility model is to eliminate the shaking or setbacks that may occur during the press-fitting process, eliminate the position or size deviation that may occur in the crankshaft assembly, and ensure the press-fitting quality of the crankshaft assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a three-dimensional schematic diagram of the crankshaft assembly;

[0014] Attached Figure 2 It is a three-dimensional schematic diagram of the press-fit die frame for assembling the crankshaft assembly of the utility model;

[0015] Attached Figure 3 It is a three-dimensional schematic diagram of another angle of the press-fit die frame for assembling the engine crankshaft assembly of the utility model;

[0016] Attached Figure 4 It is a partial three-dimensional schematic diagram of the lower crank positioning mechanism of the utility model;

[0017] Attached Figure 5 It is a cross-sectional schematic diagram of the lower crank positioning mechanism of the utility model;

[0018] Attached Figure 6It is a cross-sectional schematic diagram of the lower crank positioning mechanism of the utility model equipped with a lower crank, a crank shaft and a connecting rod;

[0019] Attached Figure 7 It is a partial three-dimensional schematic diagram of the upper crank fixing mechanism of the utility model;

[0020] Attached Figure 8 It is a three-dimensional schematic diagram of the press-fitting die frame of the utility model loaded with a lower crank, a crankshaft and a connecting rod;

[0021] Attached Fig. 9 The utility model is a three-dimensional schematic diagram of a press-fitting die frame loaded with a lower crank, an upper crank, a crank shaft and a connecting rod.

[0022] The following is a further description of the engine crankshaft assembly assembly press-fit die frame of the utility model in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0023] Attached Figure 2 This is a three-dimensional schematic diagram of the press-fit die frame for assembling the engine crankshaft assembly of the utility model, with Figure 3 This is a three-dimensional schematic diagram of another angle of the press-fit die frame for assembling the engine crankshaft assembly of the utility model, with Figure 4 This is a partial three-dimensional schematic diagram of the lower crank positioning mechanism of the utility model, attached Figure 5 It is a cross-sectional schematic diagram of the lower crank positioning mechanism of the utility model, Figure 6 The utility model is a cross-sectional schematic diagram of the lower crank positioning mechanism equipped with a lower crank, a crank shaft and a connecting rod, and Figure 7 It is a partial three-dimensional schematic diagram of the upper crank fixing mechanism of the utility model, attached Figure 8 This is a three-dimensional schematic diagram of the press-fit die frame of the utility model loaded with a lower crank, a crankshaft and a connecting rod, attached Fig. 9It is a three-dimensional schematic diagram of the press-fitting die frame of the utility model loaded with a lower crank, an upper crank, a crank shaft and a connecting rod. In the figure, 1 is a bottom plate, 2 is a die column, 3 is a slide plate, 4 is a connecting column, 5 is a connecting plate, 6 is a lower crank positioning mechanism, 6-1 is a base, 6-2 is a positioning seat, 6-3 is a guide shaft, 6-4 is a spring, 6-5 is an anti-drop bolt, 7 is a connecting rod positioning seat, 8 is an upper crank positioning mechanism, 9 is an upper crank fixing mechanism, 9-1 is a support plate, 9-2 is a fixing rod, 10 is a reinforcement sleeve, 11 is a reinforcement support plate, 12 is an upper limit pad, 13 is a lower limit pad, a is a left crank, b is a right crank, c is a crank shaft, and d is a connecting rod. As can be seen from the figure, the utility model engine crankshaft assembly assembly press die frame includes a base plate 1, a die column 2, a slide plate 3, a connecting column 4, a connecting plate 5, a lower crank positioning mechanism 6, a connecting rod positioning seat 7, an upper crank positioning mechanism 8 and an upper crank fixing mechanism 9; the base plate 1 is rectangular, and fixed through holes are provided at the four corners of the base plate; the die column 2 is a cylinder with a diameter of not less than 50 mm and there are four of them, which are respectively fixed in the four fixed through holes of the base plate; the slide plate 3 is rectangular, and sliding through holes are provided at the four corners of the slide plate, and it is slidably mounted on the die column through the sliding through holes; the connecting column 4 is a cylinder, one end of which is fixed to the center of the surface of the slide plate, and the other end is fixed to the center of the bottom surface of the connecting plate; the connecting plate 5 is rectangular, and notches for fixing the connecting plate to the bottom surface of the hydraulic press plate are arranged at the four corners of the connecting plate; the lower crank positioning mechanism 6 is arranged in the middle of the bottom plate surface; the connecting rod positioning seat 7 is arranged in front of the lower crank positioning mechanism; the upper crank positioning mechanism 8 is arranged in the middle of the bottom surface of the slide plate; the upper crank fixing mechanism 9 is arranged on the bottom surface of the slide plate on the right front side of the upper crank positioning mechanism; wherein the lower crank positioning mechanism 6 and the upper crank positioning mechanism 8 have the same structure and face opposite directions, It includes a base 6-1, a positioning seat 6-2, a guide shaft 6-3, a spring 6-4 and an anti-drop bolt 6-5; the base 6-1 and the positioning seat 6-2 are both cylindrical and are installed in sequence from bottom to top in an overlapping manner; a crankshaft through hole is provided at the center of the base and the positioning seat, and the diameter of the crankshaft through hole matches the diameter of the crankshaft root; a guide shaft through hole is provided on the radial rear side of the crankshaft through hole, and the diameter of the guide shaft through hole matches the diameter of the crankshaft; the spacing from the crankshaft through hole to the guide shaft through hole is the same as the spacing from the crankshaft on the crank to the crankshaft through hole; a radial spacing is provided on the crankshaft through hole of the positioning seat. There is an anti-slip screw hole; the guide shaft 6-3 is a cylinder with steps, the diameter of its large step matches the guide shaft through hole, and an anti-slip groove is opened in the upper half of the large step; the spring 6-4 is a compression spring and is installed in the guide shaft through hole, its inner diameter matches the diameter of the small step of the guide shaft, and its outer diameter matches the guide shaft through hole; the small step of the guide shaft is inserted downward into the guide shaft through hole, the small step enters the inner hole of the spring and contacts the surface of the spring, and the large step extends 5 to 10 mm from the surface of the positioning seat; the anti-slip bolt 6-5 is screwed into the anti-slip screw hole of the positioning seat, and the front end enters the anti-slip groove of the large step of the guide shaft;Furthermore, the crankshaft through hole and guide shaft through hole of the lower crank positioning mechanism 6 and the upper crank positioning mechanism 8 are coaxial; the connecting rod positioning seat 7 is a rectangular parallelepiped and fixed on the base surface of the lower crank positioning mechanism, and a connecting rod positioning column is arranged on the surface of the rectangular connecting rod positioning seat; the height of the connecting rod positioning seat is the sum of the thickness of the positioning seat of the lower crank positioning mechanism and the thickness of the engine connecting rod; the diameter of the connecting rod positioning column matches the diameter of the through hole at the small end of the connecting rod; the spacing from the connecting rod positioning column to the guide shaft through hole of the lower crank positioning mechanism is the same as the spacing from the through hole at the large end of the connecting rod to the through hole at the small end; the upper crank fixing mechanism 9 includes a support plate 9 -1 and a fixing rod 9-2; the support plate 9-1 is an L-shaped structure, the outer end face of the short side of the L-shaped support plate is fixed upward on the bottom surface of the slide plate on the right front side of the upper crank positioning mechanism, and a sliding through hole is provided in the upper middle part of the long side of the L-shaped support plate; the fixing rod 9-2 is a long cylinder, which is inserted into the sliding through hole of the support plate, and a locking column head is provided at the front end and an inverted cone handle is provided at the rear end; the fixing position, height and extension length of the fixing rod are based on the fact that after the fixing rod is extended, the locking column head of the fixing rod just locks with the end face of the upper crank installed in the upper crank fixing mechanism; after the fixing rod is pulled back, the upper crank can be taken out from the upper crank fixing mechanism. The utility model discloses a press-fitting die frame for assembling the crankshaft assembly of an engine, which adopts a bottom plate, a die column and a slide plate to form a vertical sliding limit mechanism, so as to regulate the trajectory of the downward pressure of the hydraulic press plate, and at the same time, regulate and limit the accurate positioning of the upper crank positioning mechanism and the lower crank positioning mechanism, thereby largely eliminating the shaking or setbacks that may occur in the press-fitting process, eliminating the possible position or size deviation of the crankshaft assembly, and ensuring the press-fitting quality of the crankshaft assembly. During the specific operation, the crank shaft of the lower crank is inserted into the crank shaft through hole in the middle of the lower crank positioning mechanism, and the crank shaft through hole on the lower crank is sleeved on the guide shaft of the lower crank positioning mechanism; the crank shaft with the connecting rod is placed on the crank shaft through hole on the lower crank, and the small head end through hole of the connecting rod is sleeved on the positioning column on the surface of the connecting rod positioning seat; thereby, the positioning of the lower crank, crank shaft and connecting rod is completed; the crank shaft of the upper crank is inserted into the crank shaft through hole of the upper crank positioning mechanism, and the crank shaft through hole on the upper crank is sleeved on the guide shaft of the upper crank positioning mechanism; the fixing rod of the upper crank fixing mechanism is pushed so that the engaging column head of the fixing rod is just engaged with the end face of the upper crank installed in the upper crank fixing mechanism; thereby, the positioning and fixing of the upper crank is completed. Turn on the hydraulic press and control the hydraulic press plate to slowly descend. The slide plate fixedly connected to the bottom of the hydraulic press plate moves downward under the guidance and limitation of the mold column, and presses the crankshaft into the crankshaft through-holes of the upper crank and the lower crank. It should be noted that after the press fitting begins, the crankshaft will first contact the surface of the upper and lower guide shafts, and then continue to press the crankshaft into place by overcoming the tension of the spring. Due to the reaction force of the spring, the crankshaft enters the crankshaft through-holes of the upper crank and the lower crank more smoothly; and there will be no displacement due to the shaking or setbacks of the hydraulic press plate. ;

[0024] As one of the preferred solutions, the lower part of the mold column is also provided with a reinforcing sleeve 10 and a reinforcing support plate 11; the reinforcing sleeves 10 are cylindrical and there are four of them, which are respectively mounted on the lower part of the four mold columns, and the bottom surface is fixedly connected to the bottom plate; the reinforcing support plates are rectangular and there are two of them, and through holes are set at the two ends of the reinforcing support plates; the reinforcing support plates are respectively mounted on the middle part of the left and right mold columns in groups of two, that is, directly above the reinforcing sleeves through the through holes at both ends. In this way, the stability and rigidity of the mold column can be further increased, and the impact of shaking or setbacks that may occur on the upper working surface of the hydraulic press can be reduced.

[0025] As one of the preferred solutions, in order to avoid excessive pressure between the crankshaft and the crank after being pressed into place, a limit pad is also provided between the base plate and the slide plate; the limit pad includes a lower limit pad 12 and an upper limit pad 13, the lower limit pad 12 is a polygonal cylinder and there are two of them, respectively fixed on the surface of the base plate at the middle inner position between the left and right mold columns in a group of two; the upper limit pad 13 is a polygonal cylinder and there are two of them, respectively fixed on the bottom surface of the slide plate at the relative position to the lower limit pad. In this way, when the slide plate is pressed into place, the pressure of the slide plate will be mainly borne by the upper and lower limit pads, thereby avoiding excessive pressure on the crankshaft and the crank.

[0026] Obviously, the beneficial technical effect of the engine crankshaft assembly assembly press-fitting die frame of the utility model is to eliminate the shaking or setbacks that may occur during the press-fitting process, eliminate the position or size deviation that may occur in the crankshaft assembly, and ensure the press-fitting quality of the crankshaft assembly.

Claims

1. An engine crankshaft assembly press-fit die set, characterized in that: The press-fitting die frame comprises a bottom plate, a die column, a slide plate, a connecting column, a connecting plate, a lower crank positioning mechanism, a connecting rod positioning seat, an upper crank positioning mechanism and an upper crank fixing mechanism; the bottom plate is rectangular, and fixed through holes are arranged at the four corners of the bottom plate; the die column is a cylinder with a diameter of not less than 50 mm and there are four of them, which are respectively fixed in the four fixed through holes of the bottom plate; the slide plate is rectangular, and sliding through holes are arranged at the four corners of the slide plate, and the slide plate is slidably mounted on the die column through the sliding through holes; the connecting The column is a cylinder, one end of which is fixed to the center of the surface of the slide plate, and the other end is fixed to the center of the bottom surface of the connecting plate; the connecting plate is rectangular, and notches are provided at the four corners of the connecting plate to fix the connecting plate to the bottom of the working table of the hydraulic press; the lower crank positioning mechanism is arranged in the middle of the bottom plate surface; the connecting rod positioning seat is arranged in front of the lower crank positioning mechanism; the upper crank positioning mechanism is arranged in the middle of the bottom surface of the slide plate; the upper crank fixing mechanism is arranged on the bottom surface of the slide plate on the right front side of the upper crank positioning mechanism; wherein, The lower crank positioning mechanism and the upper crank positioning mechanism have the same structure and are oriented in opposite directions, and include a base, a positioning seat, a guide shaft, a spring and an anti-slip bolt; the base and the positioning seat are both cylindrical and are installed in an overlapping manner from bottom to top; a crank shaft through hole is provided in the center of the base and the positioning seat, and the diameter of the crank shaft through hole matches the diameter of the crank shaft root; a guide shaft through hole is provided on the radial rear side of the crank shaft through hole, and the diameter of the guide shaft through hole matches the diameter of the crank shaft; the spacing from the crank shaft through hole to the guide shaft through hole is the same as the spacing from the crank shaft on the crank to the crank shaft through hole; an anti-slip screw hole is provided in the radial direction of the crank shaft through hole of the positioning seat; The shaft is a cylinder with steps, the diameter of its large step matches the guide shaft through hole, and an anti-slip groove is opened in the upper half of the large step; the spring is a compression spring and is installed in the guide shaft through hole, its inner diameter matches the diameter of the small step of the guide shaft, and its outer diameter matches the guide shaft through hole; the small step of the guide shaft is inserted downward into the guide shaft through hole, the small step enters the spring inner hole and contacts the spring surface, and the large step extends 5 to 10 mm from the surface of the positioning seat; the anti-slip bolt is screwed into the anti-slip screw hole of the positioning seat, and the front end enters the anti-slip groove of the large step of the guide shaft; and the crank shaft through hole and the guide shaft through hole of the lower crank positioning mechanism and the upper crank positioning mechanism are coaxial; The connecting rod positioning seat is a rectangular parallelepiped, and a connecting rod positioning column is arranged on the surface of the rectangular parallelepiped connecting rod positioning seat; the height of the connecting rod positioning seat is the sum of the thickness of the positioning seat of the lower crank positioning mechanism and the thickness of the engine connecting rod; the diameter of the connecting rod positioning column matches the diameter of the through hole at the small end of the connecting rod; the spacing from the connecting rod positioning column to the through hole of the guide shaft of the lower crank positioning mechanism is the same as the spacing from the through hole at the large end of the connecting rod to the through hole at the small end; The upper crank fixing mechanism includes a support plate and a fixing rod; the support plate is an L-shaped structure, and the outer end face of the short side of the L-shaped support plate is fixed upward to the bottom surface of the slide plate on the right front side of the upper crank positioning mechanism, and a sliding through hole is provided in the upper and middle part of the long side of the L-shaped support plate; the fixing rod is a long cylinder, which is inserted into the sliding through hole of the support plate, and a flexible column sleeve is provided at the front end and an inverted cone handle is provided at the rear end; the fixing position, height and extension length of the fixing rod are based on the fact that after the fixing rod is extended, the front end of the fixing rod is just engaged with the end face of the upper crank installed in the upper crank fixing mechanism, and after the fixing rod is pulled back, the upper crank can be taken out from the upper crank fixing mechanism.

2. The engine crankshaft assembly press-fit die set according to claim 1, characterized in that: A reinforcing sleeve and a reinforcing support plate are also provided at the lower part of the mold column; the reinforcing sleeves are cylindrical and there are four of them, which are respectively mounted on the lower part of the four mold columns, and the bottom surface is fixedly connected to the bottom plate; the reinforcing support plates are rectangular and there are two of them, and through holes are provided at the two ends of the reinforcing support plates; the reinforcing support plates are respectively mounted on the middle part of the left and right mold columns in groups of two through the through holes at both ends, that is, directly above the reinforcing sleeves.

3. The engine crankshaft assembly press-fit die set according to claim 1, characterized in that: A limiting pad is also arranged between the bottom plate and the slide plate; the limiting pad comprises a lower limiting pad and an upper limiting pad, the lower limiting pad is a polygonal cylinder and there are two of them, which are respectively fixed on the bottom plate surface at the middle inner position between the left and right mold columns in a group of two; the upper limiting pad is a polygonal cylinder and there are two of them, which are respectively fixed on the bottom surface of the slide plate at a position opposite to the lower limiting pad.

Images