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 utility model relates to a press-fitting technology for an oil-slinging pan of an engine crankshaft assembly, in particular to a press-fitting fixture for the oil-slinging 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 crankshaft, 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 provided 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 using an interference fit, and then the left crank, the right crank and the crank shaft are fixedly connected into one 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 slinger plate). The prior art method for pressing the oil slinger 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 slinger plate on the left crank end face, and uses a hollow press head to press the oil slinger plate onto the left crank end face. There is an interference fit between the outer edge of the oil slinger plate and the inner circle of the left crank end face. Although this press-fitting method clamps the left crankshaft plate, the bottom surface of the left crankshaft plate has no support, 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. In severe cases, it may 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 existing method of press-fitting the oil slinger pan of the engine crankshaft assembly has problems such as 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 engine crankshaft assembly oil slinger pan press-fitting method, 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 utility model proposes an engine crankshaft assembly oil slinger pan press-fitting fixture.

[0005] The utility model provides an engine crankshaft assembly oil-slinging plate pressing fixture, comprising a chassis, a chuck I, a chuck II and a cylinder group I; the chassis is a circular plate, a cylindrical support platform is provided at the center of the chassis, and three trapezoidal slides are evenly distributed on the circumference of the upper surface of the chassis; an inner hollow step is provided 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 disc, 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 disc 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, comprising a base, a cylinder group II and a pad; the base is a cubic structure with a trapezoidal slide at the bottom, and a diameter of the left crank disc of the crankshaft assembly is provided at the front end of the base The rear end of the base is provided with an L-shaped seat, and the rear end of the base is provided with an L-shaped seat. The rear end of the base is provided with an L-shaped seat. The piston end of the cylinder II is connected to the rear end of the base; the base is a long strip plate and its thickness matches the spacing between the left crank and the right crank of the crankshaft assembly. 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 base is based on the fact that 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 chuck 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 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 oil-slinging pan press-fitting fixture of the engine crankshaft assembly of the utility model is that it can provide stable support for the left crank of the crankshaft assembly, avoid slight deformation between the left crank and the crank shaft, and thus ensure that the coaxiality of the crankshaft assembly meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0010] Attachment Figure 2 It is a three-dimensional schematic diagram of the press-fit fixture for the oil slinger pan of the engine crankshaft assembly of the utility model;

[0011] Attachment Figure 3 It is a three-dimensional schematic diagram of the chassis of the press-fit fixture of the utility model;

[0012] Attachment Figure 4 It is a three-dimensional schematic diagram of the chuck I of the press-fitting fixture of the utility model;

[0013] Attachment Figure 5 It is a three-dimensional schematic diagram of the chuck II of the press-fitting fixture of the utility model;

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

[0015] Attachment Figure 7 This is a three-dimensional schematic diagram of the cylinder group I of the press-fitting fixture of the utility model;

[0016] Attachment Figure 8 It is a three-dimensional schematic diagram of the clamping state of the press-fitting fixture of the utility model;

[0017] Attachment Figure 9 It is a cross-sectional schematic diagram of the clamping state of the press-fitting fixture of the utility model;

[0018] Attachment Figure 10 It is a three-dimensional schematic diagram of the press-fitting fixture pad of the utility model.

[0019] In the figure, 1 is the chassis, 1-1 is the trapezoidal slide, 1-2 is the support platform; 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 press-fit fixture for the oil slinger pan of an engine crankshaft assembly of the present invention in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0021] Referring to the accompanying drawings, the utility model of the engine crankshaft assembly oil slinger plate press-fitting fixture includes a chassis 1, a chuck I2, a chuck II3 and a cylinder group I4; the chassis is a circular disk, a cylindrical support platform is provided in 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; the center of the cylindrical support platform is provided with an inner hollow step 1-2, wherein the diameter of the outer step is the same as the diameter of the left crank disc, 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. An arc-shaped notch with the same diameter as the left crankshaft disk of the crankshaft assembly is provided at the front end of the chuck I; the chuck II is a combined structure and is two in number, 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 an arc-shaped notch with the same diameter as the left crankshaft disk of the crankshaft assembly is provided at the front end of the base. The left crank assembly has an arc-shaped notch with the same diameter as the left crank 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 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 base The rectangular through hole matches and is inserted in 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, including a fixing seat and cylinder I 4-3; 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, the crankshaft assembly is pressed with one end of the bearing 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 outside 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 solid 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 occur between the left crank of the crankshaft assembly and the crankshaft shaft, 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 mounting base for cylinder group I is a combined structure, comprising a trapezoidal base 4-1 and a mounting plate 4-2. The trapezoidal base is inserted into the trapezoidal chute of the chassis, and the mounting plate is bolted to the surface of the trapezoidal base. This combined mounting base allows for easy adjustment of the fixed position of cylinder group I within the chassis' trapezoidal chute, accommodating the press-fitting of oil slinger pans for various crankshaft assembly models.

[0023] See attached Figure 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 allows the pad to easily enter between the left and right cranks of the crankshaft assembly when moving forward, thereby providing a stable support for the left crank of the crankshaft assembly.

[0024] Obviously, the beneficial technical effect of the oil-slinging pan press-fitting fixture of the engine crankshaft assembly of the utility model is that it can provide a 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.

Claims

1. A press-fit fixture for an engine crankshaft assembly oil slinger pan, 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 provided in the center of the chassis, and three trapezoidal slides are evenly distributed on the circumference of the upper surface of the chassis; an inner hollow step is provided in the center of the cylindrical support platform, wherein the diameter of the outer step is the same as the diameter of the left crank disc, 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 disc 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, 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 disc of the crankshaft assembly is provided at the front end of the base shaped notch, 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 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 one end of the crankshaft assembly with the bearing pressed in 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 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.

2. The engine crankshaft assembly oil slinger pan press-fitting 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-fitting 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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