Upper crank fixing mechanism for press fitting of engine crankshaft assembly

Abstract

In order to solve the problems that in the prior art, an upper crank fixing mechanism for press fitting of an engine crankshaft assembly is complex in operation, large in labor intensity, prone to errors and the like, the utility model provides the upper crank fixing mechanism for press fitting of the engine crankshaft assembly, which comprises a clamping mechanism, a locking mechanism and an inclined plane column, the clamping mechanism is arranged beside the crank positioning mold on the bottom surface of the mold frame movable plate and comprises a door-shaped frame, a guide shaft, a clamping spring and an L-shaped plate; the locking mechanism is arranged right in front of the right side supporting plate of the door-shaped frame and comprises a locking handle, a locking shaft, a locking spring and a cover plate. And the inclined plane column is a rectangular column rod with an inclined plane and is fixedly arranged on the surface of the mould base bottom plate under the driving section roller of the L-shaped plate. The upper crank fixing mechanism for press fitting of the engine crankshaft assembly has the advantages that operation is simplified, labor intensity is lowered, and the possibility of misoperation is reduced.

Description

Technical Field

[0001] The utility model relates to an assembly press-fit technology for an engine crankshaft assembly, in particular to an upper crank fixing mechanism for the press-fit of an engine crankshaft assembly. 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 hydraulic press. To ensure the quality of press, a mold frame is usually used for press. That is, the bottom plate and mold column of the mold frame are fixed on the work surface of the hydraulic press, and the sliding plate of the mold frame is mounted on the mold column and then fixed on the bottom surface of the hydraulic press plate. A mold for positioning the left crank and the crank shaft is set on the bottom plate of the mold frame, and a mold for positioning the right crank is set on the bottom surface of the mold frame sliding plate. The left crank and the crank shaft (the connecting rod has been mounted on the crank shaft at this time) are placed on the mold on the bottom plate of the mold frame in sequence, and the right crank is detachably placed on the mold on the bottom surface of the sliding plate, so as to ensure that the axes of the crank shaft through hole on the left crank, the crank shaft and the crank shaft through hole on the right crank are coaxial. Turn on the hydraulic press, and the hydraulic press plate pushes the mold frame sliding plate to move downward, and finally presses the two ends of the crank shaft into the crank shaft 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 below the operator during press-fitting, it is also called the lower crank; and the right crank is placed above the operator, so it is also called the upper crank. Since the upper crank is in a suspended state when placed in the positioning mold on the bottom surface of the sliding plate, a special mechanism is required to fix it on the positioning mold on the bottom surface of the sliding plate. The prior art engine crankshaft assembly press-fit upper crank fixing mechanism uses a fixing rod to clamp the upper crank on the mold on the bottom surface of the sliding plate, that is, a support plate is used to set the fixing rod on the right front side of the upper crank positioning mold, and the fixing rod can be extended and retracted back and forth in the through hole of the support plate. When the upper crank needs to be placed, the fixing rod is pulled backward, and the front end of the fixing rod leaves the upper crank positioning mold, and the upper crank can be conveniently placed in the positioning mold. After the upper crank is placed in the positioning die, push the fixing rod forward and fix the front end to lock the upper crank on the positioning die. After the press-fitting is completed, the fixing rod needs to be pulled back to remove the crankshaft assembly that has been press-fitted. In order to prevent the upper crank from shifting due to the shaking or shaking of the hydraulic press plate during the press-fitting process, the operator needs to hold the fixing rod during the entire press-fitting process, and pull out the fixing rod after the press-fitting is completed to remove the crankshaft assembly (see attached Figure 2 , 3 In the figure, 1 is the base plate, 2 is the movable lever, 3 is the fixing mechanism, 3-1 is the support plate, 3-2 is the fixing rod, a is the left crank, b is the right crank, c is the crank shaft, and d is the connecting rod).

[0004] Obviously, the prior art engine crankshaft assembly press-fitting crank fixing mechanism has the problems of complicated operation, high labor intensity and easy error. Summary of the invention

[0005] In order to solve the problems of complicated operation, high labor intensity and easy error in the prior art engine crankshaft assembly press-fit crank fixing mechanism, the utility model provides an engine crankshaft assembly press-fit crank fixing mechanism.

[0006] The utility model discloses a crank fixing mechanism for press-fitting an engine crankshaft assembly, comprising a clamping mechanism, a locking mechanism and a bevel column; the clamping mechanism is arranged on the side of the crank positioning mold on the bottom surface of the mold frame movable plate, and comprises a door-shaped frame, a guide shaft, a clamping spring and an L-shaped plate; the door-shaped frame is a door-shaped structure, and its top is fixed upward on the side of the crank positioning mold on the bottom surface of the mold frame movable plate; coaxial guide holes are arranged at the lower part of the two support plates of the door-shaped frame, wherein the guide hole of the left support plate is circular, and the guide hole of the right support plate is rectangular; in addition, a locking through hole with an inner step at the front end is arranged in the middle part of the front wall of the rectangular guide hole of the right support plate; the diameter of the guide shaft is the same as the circular diameter of the door-shaped frame The guide hole matches and is inserted into the circular guide hole, and the front end is fixedly connected to the rear end of the L-shaped plate; the locking spring is sleeved on the outer circle of the guide shaft, the front end is in contact with the rear end of the L-shaped plate, and the rear end is in contact with the left side support plate of the door-shaped frame; the L-shaped plate is an inverted L-shaped structure with a rectangular cross-section; the horizontal side of the L-shaped plate is a locking section, which slides with the rectangular guide hole of the door-shaped frame; and a lock hole is provided on the center line of the positive side of the L-shaped plate locking section; the vertical side of the L-shaped plate is a driving section, and a roller is provided at the bottom; the locking mechanism is arranged in front of the right side support plate of the door-shaped frame, and includes a locking handle, a locking shaft, a locking spring and a cover plate; the locking handle is fixedly connected to The rear end of the lock shaft; the lock shaft is a cylinder with an outer step in the middle front part, the diameters of the front and rear sections of the lock shaft step match the diameters of the inner step of the door frame locking through hole, and the diameter of the outer step of the lock shaft matches the diameter of the door frame locking through hole; the inner diameter of the locking spring matches the diameter of the rear section of the lock shaft step, and the outer diameter matches the diameter of the door frame locking through hole, and is sleeved on the rear section of the lock shaft step; the cover plate is a rectangular plate with a hole in the middle, which is installed on the outside of the door frame locking through hole to confine the lock shaft and the locking spring in the locking through hole; the inclined column is a rectangular column rod with an inclined surface, which is fixedly installed on the surface of the mold frame bottom plate just below the roller of the L-shaped plate driving section; wherein, The height of the door frame, the position of the guide hole and the length of the L-shaped plate engaging section are all based on the fact that when the L-shaped plate is pushed to the rightmost side of the door frame by the engaging spring, the front end of the L-shaped plate engaging section is just engaged with the bottom surface of the upper crank inverted on the mold; the length of the front section of the locking shaft step is based on the fact that after the locking spring pushes the locking shaft to the step in the locking through hole, the front section of the locking shaft step can enter the locking hole of the L-shaped plate engaging section; the length of the L-shaped plate driving section, the height and inclination of the inclined column are all based on the fact that when the movable plate of the mold frame is pressed into place, the roller of the L-shaped plate driving section drives the L-shaped plate to move to the left under the action of the inclined surface of the inclined column and makes the front end of the L-shaped plate engaging section leave the bottom surface of the upper crank.

[0007] Furthermore, the roller of the L-shaped plate driving section is a bearing roller.

[0008] Furthermore, the inclined surface of the inclined surface column is covered with a metal plate.

[0009] The beneficial technical effects of the crank fixing mechanism for press-fitting the engine crankshaft assembly of the utility model are that the operation is simplified, the labor intensity is reduced, and the possibility of operating errors is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a three-dimensional schematic diagram of the crankshaft assembly;

[0011] Attached Figure 2 It is a three-dimensional schematic diagram of a crank fixing mechanism for press-fitting an engine crankshaft assembly in the prior art;

[0012] Attached Figure 3 It is a three-dimensional schematic diagram of another angle of the crank fixing mechanism of the prior art engine crankshaft assembly press-fit;

[0013] Attached Figure 4 It is a three-dimensional schematic diagram of the crank fixing mechanism of the engine crankshaft assembly press-fitted by the utility model;

[0014] Attached Figure 5 It is a three-dimensional schematic diagram of another angle of the crank fixing mechanism of the engine crankshaft assembly press-fitted by the utility model;

[0015] Attached Figure 6 It is an exploded three-dimensional schematic diagram of the crank fixing mechanism of the engine crankshaft assembly press-fitted in the utility model;

[0016] Attached Figure 7 It is a partial cross-sectional schematic diagram of the crank fixing mechanism of the engine crankshaft assembly press-fitted in the utility model;

[0017] Attached Figure 8 It is a three-dimensional schematic diagram of a crank fixing mechanism of an engine crankshaft assembly being pressed and assembled in a completed state.

[0018] The crank fixing mechanism for press-fitting the engine crankshaft assembly of the utility model will be further described below in conjunction with the accompanying drawings and specific implementations. DETAILED DESCRIPTION

[0019] Attached Figure 4 This is a three-dimensional schematic diagram of the crank fixing mechanism of the engine crankshaft assembly press-fitted by the utility model, with Figure 5 This is a three-dimensional schematic diagram of another angle of the crank fixing mechanism of the engine crankshaft assembly press-fitted by the utility model, with Figure 6 This is an exploded three-dimensional schematic diagram of the crank fixing mechanism of the engine crankshaft assembly press-fitted with the utility model, with Figure 7 It is a partial cross-sectional schematic diagram of the crank fixing mechanism of the engine crankshaft assembly press-fitted on the utility model, with Figure 8It is a three-dimensional schematic diagram of the press-fitting state of the upper crank fixing mechanism of the engine crankshaft assembly of the utility model. In the figure, 4-1 is a door-shaped frame, 4-2 is a guide shaft, 4-3 is a locking spring, 4-4 is an L-shaped plate, 4-5 is an inclined column, 4-6 is a locking handle, 4-7 is a locking shaft, 4-8 is a locking spring, 4-9 is a cover plate, and B is an upper crank.As can be seen from the figure, the crank fixing mechanism of the crankshaft assembly of the utility model is pressed and installed, including a clamping mechanism, a locking mechanism and a bevel column 4-5; the clamping mechanism is arranged on the side of the crank positioning mold on the bottom surface of the mold frame movable plate, including a door-shaped frame 4-1, a guide shaft 4-2, a clamping spring 4-3 and an L-shaped plate 4-4; the door-shaped frame 4-1 is a door-shaped structure, and its top is fixed upward on the side of the crank positioning mold on the bottom surface of the mold frame movable plate; coaxial guide holes are provided at the lower part of the two support plates of the door-shaped frame, wherein the guide hole of the left support plate is circular, and the guide hole of the right support plate is rectangular; in addition, a locking through hole with an inner step at the front end is provided in the middle of the front wall of the rectangular guide hole of the right support plate; the guide shaft 4 -2 has a diameter that matches the circular guide hole of the door frame and is inserted into the circular guide hole, with the front end fixedly connected to the rear end of the L-shaped plate; the locking spring 4-3 is sleeved on the outer circle of the guide shaft, with the front end in contact with the rear end of the L-shaped plate, and the rear end in contact with the left support plate of the door frame; the L-shaped plate 4-4 is an inverted L-shaped structure with a rectangular cross-section; the horizontal side of the L-shaped plate is a locking section, which slides with the rectangular guide hole of the door frame; and a lock hole is provided on the center line of the positive side of the locking section of the L-shaped plate; the vertical side of the L-shaped plate is a driving section, with a roller provided at the bottom; the locking mechanism is provided in front of the right support plate of the door frame, and includes a locking handle 4-6, a locking shaft 4-7, a locking spring 4-8 and a cover Plate 4-9; the locking handle 4-6 is fixedly connected to the rear end of the lock shaft; the lock shaft 4-2 is a cylinder with an outer step in the middle front part, the diameters of the front and rear sections of the lock shaft step match the diameters of the inner steps of the door frame locking through hole, and the diameter of the outer step of the lock shaft matches the diameter of the door frame locking through hole; the inner diameter of the locking spring 4-8 matches the diameter of the rear section of the lock shaft step, and the outer diameter matches the diameter of the door frame locking through hole, and is sleeved on the rear section of the lock shaft step; the cover plate 4-9 is a rectangular plate with a hole in the middle part, which is installed on the outside of the door frame locking through hole to confine the lock shaft and the locking spring in the locking through hole; the bevel column is a rectangular column rod with an incline, which is fixedly installed on the roller of the L-shaped plate drive section. The surface of the mold frame bottom plate directly below; wherein, the height of the door frame, the position of the guide hole and the length of the L-shaped plate engaging section are all based on the fact that when the L-shaped plate is pushed to the rightmost side of the door frame by the engaging spring, the front end of the L-shaped plate engaging section is just engaged with the bottom surface of the upper crank inverted on the mold; the length of the front section of the lock shaft step is based on the fact that after the locking spring pushes the lock shaft to the step in the locking through hole, the front section of the lock shaft step can enter the lock hole of the L-shaped plate engaging section; the length of the L-shaped plate driving section, the height and inclination of the inclined column are all based on the fact that when the mold frame movable plate is pressed into place, the roller of the L-shaped plate driving section drives the L-shaped plate to move to the left under the action of the inclined surface of the inclined column and makes the front end of the L-shaped plate engaging section leave the bottom surface of the upper crank. The utility model adopts an almost fully automatic operation mode for the upper crank fixing mechanism of the engine crankshaft assembly press-fit, which effectively reduces the complexity of the operation, simplifies the operation and reduces the labor intensity.During the specific operation, the upper crank is placed on the mold on the bottom surface of the mold frame sliding plate as required, and the locking handle is pulled, the lock shaft moves backward to disengage the lock hole of the L-shaped plate clamping section, and the L-shaped plate moves to the left under the action of the clamping spring until the front end of the L-shaped plate clamping section is clamped on the bottom surface of the upper crank, thereby fixing the upper crank on the mold. Pressing begins, the sliding plate moves downward, and the roller at the lower end of the L-shaped plate driving section contacts the inclined surface of the inclined column. As the sliding plate moves downward, under the action of the inclined surface, the L-shaped plate begins to move to the right until the front end of the L-shaped plate clamping section leaves the bottom surface of the upper crank. At the same time, as the L-shaped plate moves to the right, the lock shaft will enter the lock hole of the L-shaped plate clamping section again under the action of the locking spring, and lock the L-shaped plate at the position where the front end of the clamping section leaves the bottom surface of the upper crank. At this time, the mold frame sliding plate retracts upward, and the operator can easily remove the crankshaft assembly that has been pressed. It can be seen that during the entire pressing process, the operator only needs to pull the locking handle, which not only reduces the labor intensity but also effectively reduces the possibility of operational errors.

[0020] As one of the preferred solutions, the roller of the L-shaped plate driving section is a bearing roller, thereby effectively reducing the resistance of the inclined surface acting on the roller and increasing the reliability of the inclined surface pushing the L-shaped plate to move.

[0021] As one of the preferred solutions, the inclined surface of the inclined column is covered with a metal plate. This can effectively increase the efficiency of the inclined surface pushing the L-shaped plate, reduce friction, and increase service life. The cooperation between the inclined surface of the metal plate and the bearing roller increases the reliability and stability of the operation of the entire mechanism.

[0022] Obviously, the beneficial technical effect of the crank fixing mechanism pressed onto the engine crankshaft assembly of the utility model is to simplify the operation, reduce the labor intensity and reduce the possibility of operating errors.

Claims

1. A crank fixing mechanism for press-fitting an engine crankshaft assembly, characterized in that: The fixing mechanism includes a snap-fit ​​mechanism, a locking mechanism and a bevel column; the snap-fit ​​mechanism is arranged on the side of the crank positioning mold on the bottom surface of the mold frame movable plate, and includes a door-shaped frame, a guide shaft, a snap-fit ​​spring and an L-shaped plate; the door-shaped frame is a door-shaped structure, and its top is fixed upward on the side of the crank positioning mold on the bottom surface of the mold frame movable plate; coaxial guide holes are arranged at the lower part of the two support plates of the door-shaped frame, wherein the guide hole of the left support plate is circular, and the guide hole of the right support plate is rectangular; in addition, a locking through hole with an inner step at the front end is arranged in the middle of the front wall of the rectangular guide hole of the right support plate; the diameter of the guide shaft matches the circular guide hole of the door-shaped frame, and is inserted in the circular guide hole shaped guide hole, and the front end is fixedly connected to the rear end of the L-shaped plate; the locking spring is sleeved on the outer circle of the guide shaft, and the front end is in contact with the rear end of the L-shaped plate, and the rear end is in contact with the left support plate of the door-shaped frame; the L-shaped plate is an inverted L-shaped structure with a rectangular cross-section; the horizontal side of the L-shaped plate is a locking section, which slides with the rectangular guide hole of the door-shaped frame; and a lock hole is provided on the center line of the positive side of the L-shaped plate locking section; the vertical side of the L-shaped plate is a driving section, and a roller is provided at the bottom; the locking mechanism is arranged in front of the right support plate of the door-shaped frame, and includes a locking handle, a locking shaft, a locking spring and a cover plate; the locking handle is fixedly connected to the rear end head of the locking shaft; the The lock shaft is a cylinder with an outer step in the middle front part, the diameters of the front and rear sections of the lock shaft step match the diameters of the inner step of the door frame locking through hole, and the diameter of the outer step of the lock shaft matches the diameter of the door frame locking through hole; the inner diameter of the locking spring matches the diameter of the rear section of the lock shaft step, and the outer diameter matches the diameter of the door frame locking through hole, and is sleeved on the rear section of the lock shaft step; the cover plate is a rectangular plate with a hole in the middle part, which is installed on the outside of the door frame locking through hole to confine the lock shaft and the locking spring in the locking through hole; the inclined column is a rectangular column rod with an inclined surface, which is fixedly installed on the surface of the mold base bottom plate just below the roller of the L-shaped plate driving section; wherein, the door-shaped The height of the frame, the position of the guide hole and the length of the L-shaped plate engaging section are all based on the fact that when the L-shaped plate is pushed to the rightmost side of the door-shaped frame by the engaging spring, the front end of the L-shaped plate engaging section is just engaged with the bottom surface of the upper crank inverted on the mold; the length of the front section of the locking shaft step is based on the fact that after the locking spring pushes the locking shaft to the step in the locking through hole, the front section of the locking shaft step can enter the locking hole of the L-shaped plate engaging section; the length of the L-shaped plate driving section, the height and inclination of the inclined column are all based on the fact that when the movable plate of the mold frame is pressed into place, the roller of the L-shaped plate driving section drives the L-shaped plate to move to the left under the action of the inclined surface of the inclined column and makes the front end of the L-shaped plate engaging section leave the bottom surface of the upper crank.

2. According to claim 1, the crank fixing mechanism for press-fitting the engine crankshaft assembly is characterized in that: The roller of the L-shaped plate driving section is a bearing roller.

3. The crank fixing mechanism for press-fitting the engine crankshaft assembly according to claim 1 is characterized in that: The inclined surface of the inclined surface column is covered with a metal plate.

Images