Press fitting clamp for oil flinger of engine crankshaft assembly

Abstract

In order to solve the problems that according to an engine crankshaft assembly oil flinger press-fitting method in the prior art, slight deformation between a left crank and a crank shaft is likely to be caused, and the coaxiality of a crankshaft assembly and a curved bar cannot meet the design requirement, the engine crankshaft assembly oil flinger press-fitting clamp is provided and comprises a base plate, a chuck I, a chuck II and an air cylinder set I; a cylindrical supporting table is arranged in the center of the base plate, and three trapezoidal sliding grooves are evenly distributed in the circumference of the upper surface of the base plate. The chuck I is of a cubic structure with a trapezoidal slide way at the bottom, and is mounted on one trapezoidal slide way of the chassis; the two chucks II are of a combined structure and are installed on the other two trapezoidal sliding grooves of the base plate respectively. And the cylinder group I is arranged on the rear sides of the chuck I and the chuck II. The crankshaft assembly has the advantages that the left crank of the crankshaft assembly can be stably supported, slight deformation between the left crank and the crank shaft is avoided, and therefore it is guaranteed that the coaxiality of a bent lever of the crankshaft assembly meets the design requirement.

Description

Technical Field

[0001] The invention relates to a press-fit technology for an oil slinger pan of an engine crankshaft assembly, and in particular to a press-fit fixture for an oil slinger pan of an engine crankshaft assembly. Background Art

[0002] The engine crankshaft assembly includes several parts, such as: a left crank, a right crank, a crank shaft, a connecting rod, a bearing, a gear and an oil slinger pan. The shapes of the left crank and the right crank are roughly the same, both including a disc and a crank rod; the crank rod is arranged at the center of the disc, and a crank shaft through hole is arranged at the eccentric position of the disc. During the specific assembly, the bearings or gears on the crank rods of the left crank and the right crank are usually first pressed onto the crank rods of the left crank and the right crank by interference fit, and then the left crank, the right crank and the crank shaft are fixedly connected into one body through the interference fit of the crank shaft through holes on the left crank and the right crank and the crank shaft, and the connecting rod is mounted on the middle section of the crank shaft to form a sliding or rotatable fit. In order to facilitate the press-fitting of the crank and the crank shaft, the oil slinger pan must be pressed onto the end face of the left crank after the above press-fitting is completed, thereby completing the assembly of the engine crankshaft assembly (see attached Figure 1 , in the figure, a is the left crank, b is the right crank, c is the crankshaft, d is the connecting rod, e is the bearing, f is the gear, and g is the oil-slinging plate). The prior art method for pressing the oil-slinging plate of the engine crankshaft assembly uses a three-claw plate to clamp the left crankshaft plate of the engine crankshaft assembly, places the oil-slinging plate on the left crank end face, and uses a hollow press head to press the oil-slinging plate on the left crank end face. There is an interference fit between the outer edge of the oil-slinging plate and the inner circle of the left crank end face. Although this press-fitting method clamps the left crankshaft plate, there is no support on the bottom surface of the left crankshaft plate, and the left crankshaft plate is actually in a suspended state. Due to problems such as force during press-fitting, it is easy to cause slight deformation between the left crankshaft plate and the crankshaft, which ultimately causes the coaxiality of the crankshaft assembly to fail to meet the design requirements, and in severe cases, it will also cause the interference fit between the left crank and the crankshaft to loosen. The crankshaft assembly crankshaft coaxiality refers to the degree of deviation of the crankshaft axes of the left crank and the right crank on the same straight line after assembly.

[0003] Obviously, the prior art method for pressing the oil slinger pan of the engine crankshaft assembly has the problems of easily causing slight deformation between the left crank and the crankshaft, and the coaxiality of the crankshaft assembly cannot meet the design requirements. Summary of the invention

[0004] In order to solve the problems existing in the prior art of the oil slinger pan press-fitting method of the engine crankshaft assembly, such as the slight deformation between the left crank and the crankshaft, and the coaxiality of the crankshaft assembly crankshaft cannot meet the design requirements, the present invention proposes an engine crankshaft assembly oil slinger pan press-fitting fixture.

[0005] The oil-slinging pan press-fitting fixture of the engine crankshaft assembly of the present invention comprises a chassis, a chuck I, a chuck II and a cylinder group I; the chassis is a circular disk, a cylindrical support platform is arranged at the center of the chassis, and three trapezoidal slide grooves are evenly distributed on the circumference of the upper surface of the chassis; an inner hollow step is arranged at the center of the cylindrical support platform, wherein the diameter of the outer step is the same as the diameter of the left crank disk, and the diameter of the inner step is larger than the outer diameter of the crankshaft assembly bearing; the chuck I is a cubic structure with a trapezoidal slide at the bottom, which is installed on a trapezoidal slide of the chassis, and an arc-shaped notch with the same diameter as the diameter of the left crank disk of the crankshaft assembly is arranged at the front end of the chuck I; the chuck II is a combined structure and there are two of them, which are respectively installed on the other two trapezoidal slide grooves of the chassis, and comprise a base, a cylinder group II and a pad; the base is a cubic structure with a trapezoidal slide at the bottom, and a groove with the same diameter as the left crank disk of the crankshaft assembly is arranged at the front end of the base The base has an arc-shaped notch with the same diameter, a rectangular step is arranged on the upper rear side of the base, and a rectangular through hole is arranged on the middle front side of the base; the cylinder group II includes a cylinder II and an L-shaped seat; the cylinder II is fixed on the rectangular step of the base through the L-shaped seat, and the piston end of the cylinder II is connected to the rear end of the pad; the pad is a long strip plate and its thickness matches the spacing between the left crank and the right crank of the crankshaft assembly, and its cross-sectional size matches the rectangular through hole of the base and is inserted into the rectangular through hole; the setting height of the pad is based on the fact that after one end of the crankshaft assembly with the bearing pressed is inserted into the empty step in the support platform, and when the chuck II is in the clamping position and the pad extends from the rectangular through hole of the base, it is just inserted between the left crank and the right crank of the crankshaft assembly; the cylinder group I is arranged on the rear side of the chuck I and the chuck II, and includes a fixing seat and a cylinder I; the cylinder I is fixedly mounted on the chassis on the rear side of the chuck I and the chuck II through the fixing seat.

[0006] Furthermore, the fixing seat of the cylinder group I is a combined structure, including a trapezoidal seat and a fixing plate; the trapezoidal seat is inserted into the trapezoidal slide groove of the chassis; and the fixing plate is fixed to the surface of the trapezoidal seat by bolts.

[0007] Furthermore, a wedge-shaped step is provided at the front end of the pad.

[0008] The beneficial technical effect of the engine crankshaft assembly oil slinger pan press-fitting fixture of the present invention is that it can provide stable support for the left crank of the crankshaft assembly, avoiding slight deformation between the left crank and the crankshaft, thereby ensuring that the coaxiality of the crankshaft assembly meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attached Figure 1 It is a three-dimensional schematic diagram of the engine crankshaft assembly;

[0010] Attached Figure 2 It is a three-dimensional schematic diagram of the press-fitting fixture of the oil-slinging pan of the engine crankshaft assembly of the present invention;

[0011] Attached Figure 3 is a three-dimensional schematic diagram of the chassis of the press-fit fixture of the present invention;

[0012] Attached Figure 4 is a three-dimensional schematic diagram of the press-fitting fixture chuck Ⅰ of the present invention;

[0013] Attached Figure 5 It is a three-dimensional schematic diagram of the press-fitting fixture chuck II of the present invention;

[0014] Attached Figure 6 is a cross-sectional schematic diagram of a press-fitting fixture chuck II of the present invention;

[0015] Attached Figure 7 It is a three-dimensional schematic diagram of the cylinder group I of the press-fitting fixture of the present invention;

[0016] Attached Figure 8 It is a three-dimensional schematic diagram of the clamping state of the press-fitting fixture of the present invention;

[0017] Attached Fig. 9 is a cross-sectional schematic diagram of the clamping state of the press-fitting fixture of the present invention;

[0018] Attached Fig.10 It is a three-dimensional schematic diagram of the press-fitting fixture pad of the present invention.

[0019] In the figure, 1 is the chassis, 1-1 is the trapezoidal slide, 1-2 is the support table; 2 is the chuck I; 3 is the chuck II, 3-1 is the base, 3-2 is the cylinder II, 3-3 is the L-shaped seat, 3-4 is the pad; 4 is the cylinder group I, 4-1 is the trapezoidal seat, 4-2 is the fixed plate, 4-3 is the cylinder I; a is the left crank, b is the right crank, c is the crank shaft, d is the connecting rod, e is the bearing, f is the gear, and g is the oil-slinging pan.

[0020] The following is a further description of the engine crankshaft assembly oil slinger pan press-fitting fixture of the present invention in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0021] Referring to the attached drawings, the press-fitting fixture for the oil-slinging plate of the engine crankshaft assembly of the present invention comprises a chassis 1, a chuck Ⅰ2, a chuck Ⅱ3 and a cylinder group Ⅰ4; the chassis is a circular plate, a cylindrical support platform is arranged at the center of the chassis, and three trapezoidal slide grooves 1-1 are evenly distributed on the circumference of the upper surface of the chassis; an inner hollow step 1-2 is arranged at the center of the cylindrical support platform, wherein the diameter of the outer step is the same as the diameter of the left crank plate, and the diameter of the inner step is larger than the outer diameter of the crankshaft assembly bearing; The chuck I is a cubic structure with a trapezoidal slide at the bottom, which is installed on a trapezoidal slide of the chassis, and an arc-shaped notch with the same diameter as the left crank disk of the crankshaft assembly is provided at the front end of the chuck I; the chuck II is a combined structure and there are two of them, which are respectively installed on the other two trapezoidal slides of the chassis, including a base 3-1, a cylinder group II and a pad 3-4; the base is a cubic structure with a trapezoidal slide at the bottom, and a notch with the same diameter as the left crank disk of the crankshaft assembly is provided at the front end of the base. The left crankshaft assembly has an arc-shaped notch with the same diameter as the left crankshaft disk, a rectangular step is provided on the upper rear side of the base, and a rectangular through hole is provided in the middle of the front side of the base; the cylinder group II includes a cylinder II 3-2 and an L-shaped seat 3-3; the cylinder II is fixed on the rectangular step of the base through the L-shaped seat, and the piston end of the cylinder II is connected to the rear end of the pad; the pad is a long strip plate and its thickness matches the spacing between the left crank and the right crank of the crankshaft assembly, and its cross-sectional size matches the rectangular size of the base. shaped through hole and inserted in the rectangular through hole; the setting height of the pad is based on the end of the crankshaft assembly with the bearing pressed and inserted in the empty step in the support table, and when the chuck II is in the clamping position and the pad extends from the rectangular through hole of the base, it is just inserted between the left crank and the right crank of the crankshaft assembly; the cylinder group I is arranged on the rear side of the chuck I and the chuck II, including a fixing seat and cylinder I4-3; the cylinder I is fixedly mounted on the chassis on the rear side of the chuck I and the chuck II through the fixing seat. During specific use, one end of the crankshaft assembly with the bearing is pressed and inserted into the empty step in the support platform. At this time, the outer side surface of the right crank of the crankshaft assembly is just placed on the step of the support platform; cylinder II is turned on, and cylinder II pushes chuck I and chuck II forward to clamp the left crank disc of the crankshaft assembly; cylinder I is turned on, and cylinder I pushes the pad forward to enter between the left crank and the right crank of the crankshaft assembly, forming a stable support for the left crank of the crankshaft assembly; the oil-slinging pan is placed on the outer side of the left crank of the crankshaft assembly, and the hydraulic press is turned on. The punch of the hydraulic press drives the hollow pressure head to press down, thereby pressing the oil-slinging pan onto the end face of the left crank of the crankshaft assembly. Since the right crank of the crankshaft assembly is firmly supported by the support platform, and the pad forms a firm support between the left and right cranks of the crankshaft assembly, the pressing force of the oil slinger pan is ultimately transmitted to the chassis; therefore, no slight deformation will be caused between the left crank of the crankshaft assembly and the crankshaft, thereby ensuring that the coaxiality of the crankshaft assembly's crankshaft meets the design requirements.

[0022] See attached Figure 7As one of the preferred technical solutions, the fixing seat of the cylinder group I is a combined structure, including a trapezoidal seat 4-1 and a fixing plate 4-2; the trapezoidal seat is inserted into the trapezoidal slide groove of the chassis; the fixing plate is fixed to the surface of the trapezoidal seat by bolts. The fixing seat with a combined structure can conveniently adjust the fixed position of the cylinder group I in the trapezoidal slide groove of the chassis, thereby meeting the press-fitting of the oil-slinging pan of different types of crankshaft assemblies.

[0023] See attached Fig.10 As one of the preferred technical solutions, the front end of the pad is provided with a wedge-shaped step. The wedge-shaped step can make it easy for the pad to enter between the left crank and the right crank of the crankshaft assembly when it moves forward, so as to provide a stable support for the left crank of the crankshaft assembly.

[0024] Obviously, the beneficial technical effect of the engine crankshaft assembly oil-slinging pan press-fitting fixture of the present invention is that it can provide stable support for the left crank of the crankshaft assembly, avoiding slight deformation between the left crank and the crankshaft, thereby ensuring that the coaxiality of the crankshaft assembly crankshaft meets the design requirements.

Claims

1. A press-fit fixture for an oil slinger pan of an engine crankshaft assembly, characterized in that: The press-fitting fixture includes a chassis, a chuck I, a chuck II and a cylinder group I; the chassis is a circular disk, a cylindrical support platform is arranged at the center of the chassis, and three trapezoidal slide grooves are evenly distributed on the circumference of the upper surface of the chassis; an inner hollow step is arranged at the center of the cylindrical support platform, wherein the diameter of the outer step is the same as the diameter of the left crank disk, and the diameter of the inner step is larger than the outer diameter of the crankshaft assembly bearing; the chuck I is a cubic structure with a trapezoidal slide at the bottom, which is installed on a trapezoidal slide of the chassis, and an arc-shaped notch with the same diameter as the diameter of the left crank disk of the crankshaft assembly is arranged at the front end of the chuck I; the chuck II is a combined structure and there are two of them, which are respectively installed on the other two trapezoidal slide grooves of the chassis, including a base, a cylinder group II and a pad; the base is a cubic structure with a trapezoidal slide at the bottom, and an arc-shaped notch with the same diameter as the diameter of the left crank disk of the crankshaft assembly is arranged at the front end of the base shaped notch, a rectangular step is arranged on the upper part of the rear side of the base, and a rectangular through hole is arranged in the middle part of the front side of the base; the cylinder group II includes cylinder II and an L-shaped seat; the cylinder II is fixed on the rectangular step of the base through the L-shaped seat, and the piston end of the cylinder II is connected to the rear end of the pad; the pad is a long strip plate and its thickness matches the spacing between the left crank and the right crank of the crankshaft assembly, and its cross-sectional size matches the rectangular through hole of the base and is inserted into the rectangular through hole; the setting height of the pad is based on the fact that after one end of the crankshaft assembly with the bearing pressed is inserted into the empty step in the support platform, and when the chuck II is in the clamping position and the pad extends from the rectangular through hole of the base, it is just inserted between the left crank and the right crank of the crankshaft assembly; the cylinder group I is arranged on the rear side of the chuck I and the chuck II, and includes a fixed seat and cylinder I; the cylinder I is fixedly mounted on the chassis on the rear side of the chuck I and the chuck II through the fixed seat.

2. The engine crankshaft assembly oil slinger pan press-fit fixture according to claim 1, characterized in that: The fixing seat of the cylinder group I is a combined structure, including a trapezoidal seat and a fixing plate; the trapezoidal seat is inserted into the trapezoidal slide groove of the chassis; the fixing plate is fixed to the surface of the trapezoidal seat by bolts.

3. The engine crankshaft assembly oil slinger pan press-fit fixture according to claim 1, characterized in that: The front end of the pad is provided with a wedge-shaped step.

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